【０００１】[0001]
【産業上の利用分野】本発明は、改善された底部構造を
有するポリエステル製ボトル及びそれを製造するための
プリフォームに関するもので、より詳細には、底部が薄
肉化されていながら、圧力や熱による変形に対して補強
された構造を有するポリエステル製ボトルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester bottle having an improved bottom structure and a preform for producing the same. The present invention relates to a polyester bottle having a structure reinforced against deformation due to.
【０００２】[0002]
【従来の技術】ポリエチレンテレフタレート（ＰＥＴ）
のようなポリエステルを延伸ブロー成形して成るボトル
は、軽量で耐衝撃性と透明性とに優れており、しかも耐
気体透過性にも優れていることから、各種飲料、特にビ
ールや炭酸系飲料或いはウーロン茶、果汁等を収容する
ための容器として広く使用されるに至っている。このボ
トルにおいて、耐圧性や耐熱性の点で最も問題となる部
分は底部であり、底部に種々の補強構造を導入するこ
と、及び底部に補強構造を導入するためにプリフォーム
にリブ等を設けることについても既に幾つかの提案がな
されている。2. Description of the Related Art Polyethylene terephthalate (PET)
Bottles formed by stretch blow molding of polyesters such as are lightweight, have excellent impact resistance and transparency, and are also excellent in gas permeation resistance, so various beverages, especially beer and carbonated beverages Alternatively, it has been widely used as a container for storing oolong tea, fruit juice and the like. In this bottle, the most problematic part in terms of pressure resistance and heat resistance is the bottom part, and various reinforcing structures are introduced into the bottom part, and ribs are provided on the preform to introduce the reinforcing structure into the bottom part. Some proposals have already been made.
【０００３】例えば、特開昭５５−７１２４５号公報に
は、二軸延伸ブロー成形用のプリフォームにおいて、底
部の壁面に上下方向に沿って複数の突条リブを形成させ
ることが記載されている。また、特公昭６３ー１１２１
２号公報には、二軸延伸ブロー成形ポリエステルボトル
において、底部に内向きの帽状体を形成すると共に、帽
状体の上端部から胴部の下部にいたる複数本の中実の突
条リブを放射状に設けることが記載されている。更に、
特開昭６０−１７２６３６号公報には、二軸延伸ブロー
成形ポリエステルボトルにおいて、底部にその中心より
放射状に複数の厚肉リブを設け、底部をリブ及びリブの
周囲部分において結晶化させることが記載されている。For example, Japanese Patent Application Laid-Open No. 55-71245 describes that a preform for biaxial stretch blow molding has a plurality of ribs formed on the bottom wall surface in the vertical direction. . Also, Japanese Patent Publication No. 63-1121
Japanese Patent Publication No. 2 discloses a biaxially stretched blow molded polyester bottle in which an inward cap is formed on the bottom and a plurality of solid ribs extending from the upper end of the cap to the lower part of the body. Is described to be provided radially. Furthermore,
JP-A-60-172636 describes that in a biaxially stretched blow-molded polyester bottle, a plurality of thick ribs are provided at the bottom in a radial pattern from the center, and the bottom is crystallized at the rib and the peripheral portion of the rib. Has been done.
【０００４】プリフォームに補強リブを設ける他の提案
として、実公平４−２５２９６号公報には、底部の壁面
に凸起状の縦リブを壁面の内外に設け、この縦リブを垂
直方向で同一面上にあるようにすることが記載されてい
る。As another proposal for providing reinforcing ribs on a preform, Japanese Utility Model Publication No. 4-25296 discloses that vertical wall ribs are provided on the bottom wall inside and outside the wall, and the vertical ribs are the same in the vertical direction. It is described to be on the plane.
【０００５】[0005]
【発明が解決しようとする課題】上記先行技術における
提案は、底部にリブを設けることにより、その補強効果
によって、耐圧性及び耐熱性を向上させようとするもの
であり、そのために底部となる部分に厚肉のリブを設け
たプリフォームを用いるものであるが、ボトルの目付け
量を節約しながら、十分な補強効果を発現させるという
目的や、その生産を効率よく行うという目的には未だ十
分満足し得るものではなかった。The proposal in the above-mentioned prior art aims to improve the pressure resistance and the heat resistance by providing a rib at the bottom to reinforce the ribs, and for that reason, the part which becomes the bottom is formed. Although it uses a preform with thick ribs on the inside, it is still sufficiently satisfied for the purpose of expressing a sufficient reinforcing effect while saving the weight of the bottle and efficient production. It wasn't possible.
【０００６】底部となる部分に厚肉のリブを設けたプリ
フォームを、二軸延伸ブロー成形に使用すれば、ボトル
底部に確かに補強リブを形成し得るが、ブロー成形時に
樹脂の流動が生じるため、補強リブを意図した程厚肉化
することができず、期待した程の補強効果を得ることが
できない。If a preform having a thick rib at the bottom is used for biaxial stretch blow molding, a reinforcing rib can be surely formed at the bottom of the bottle, but resin flow occurs during blow molding. Therefore, the reinforcing rib cannot be thickened as intended, and the expected reinforcing effect cannot be obtained.
【０００７】勿論、底部の全体の肉厚を厚くすれば、補
強リブも厚くなり、圧力に対して十分な補強効果が得ら
れるが、この場合には、ボトルの目付け量が増大して、
ボトルの重量が大きくなり、その製造コストも高くなる
という欠点を生じる。本発明者らによる実験によると、
肉厚の補強リブは、耐圧性の向上にはある程度の効果が
あるが、ボトル底部の耐圧性の向上、底部の熱変形の防
止には余り有効でないことが分かった。Of course, if the overall thickness of the bottom portion is made thicker, the reinforcing ribs also become thicker and a sufficient reinforcing effect against pressure can be obtained, but in this case, the weight of the bottle is increased,
The drawback is that the weight of the bottle is high and the manufacturing cost is high. According to the experiments by the present inventors,
It was found that the thick reinforcing ribs have some effect on improving the pressure resistance, but are not very effective for improving the pressure resistance at the bottom of the bottle and preventing thermal deformation of the bottom.
【０００８】この点において、特開昭６０−１７２６３
６号公報にみられる提案、即ち、底部にその中心より放
射状に複数の厚肉リブを設け、底部をリブ及びリブの周
囲部分において結晶化させることは、ボトル底部に耐熱
性を付与する上で有効であるが、この提案では、成形後
のボトル底部を加熱して、結晶化させねばならなく、そ
のため生産性が悪く、装置が大型化するという欠点があ
る。In this respect, JP-A-60-17263
Proposal seen in Japanese Laid-Open Patent Publication No. 6, namely, providing a plurality of thick ribs radially from the center of the bottom and crystallizing the bottom at the ribs and the peripheral portions of the ribs provides heat resistance to the bottom of the bottle. Although effective, this proposal has the drawback that the bottom of the bottle after molding has to be heated to crystallize, resulting in poor productivity and an increase in size of the apparatus.
【０００９】従って、本発明の目的は、容器底部の全体
としての厚みを比較的小さいレベルに保ちながら、十分
な補強効果と、それによる耐圧性と耐熱性とが得られ、
しかもその生産性も高く、製造も容易であるポリエステ
ル製ボトルを提供するにある。Therefore, it is an object of the present invention to obtain a sufficient reinforcing effect and the resulting pressure resistance and heat resistance while maintaining the overall thickness of the bottom of the container at a relatively small level.
Moreover, it is intended to provide a polyester bottle which has high productivity and is easy to manufacture.
【００１０】本発明の他の目的は、底部の全体としての
厚みが小さい場合にも、十分な厚みの補強帯が確保さ
れ、しかも底部が剛性と強靱性とのバランスされた構造
を有するポリエステル製ボトル及びその製造に用いるプ
リフォームを提供するにある。Another object of the present invention is to make a reinforcing band having a sufficient thickness even when the thickness of the bottom as a whole is small, and the bottom is made of polyester having a structure in which rigidity and toughness are balanced. To provide a bottle and a preform used for manufacturing the bottle.
【００１１】本発明の更に他の目的は、延伸ブロー成形
に際して所定の形状、寸法の底形状への成形が容易に行
われると共に、底部への結晶化補強帯の導入がプリフォ
ームの段階で既に行われているポリエステルボトル形成
用のプリフォームを提供するにある。Still another object of the present invention is to facilitate the formation of a bottom shape having a predetermined shape and size during stretch blow molding, and to introduce a crystallization-reinforcing band into the bottom portion at the preform stage. The present invention is to provide a preform for forming a polyester bottle.
【００１２】[0012]
【課題を解決するための手段】本発明によれば、ポリエ
ステルの二軸延伸ブロー成形で製造され、口頸部とこれ
に連なる錐台状肩部と筒状の胴部と閉塞底部とを備え、
前記底部は下向きに径が小さくなる外周部と、これに連
なる接地部と、底中心部と、底中心部と接地部とを接続
する上向きに凸の湾曲部とから成るポリエステル製ボト
ルにおいて、前記湾曲部及び接地部には、底部中心から
少なくとも接地部迄放射状に延びており且つ外表面から
厚み方向の途中迄結晶化により白化された複数本の結晶
化補強帯が非白化域を介して交互に設けられていること
を特徴とする底部が強化されたポリエステル製ボトルが
提供される。According to the present invention, it is manufactured by biaxially stretch blow molding of polyester, and comprises a mouth neck portion, a frustum-shaped shoulder portion connected to the mouth neck portion, a cylindrical body portion, and a closed bottom portion. ,
In the bottle made of polyester, the bottom portion includes an outer peripheral portion having a downwardly reduced diameter, a grounding portion connected to the bottom portion, a bottom center portion, and an upwardly convex curved portion connecting the bottom center portion and the grounding portion, In the curved portion and the grounded portion, a plurality of crystallization reinforcing bands that extend radially from the center of the bottom to at least the grounded portion and are whitened by crystallization halfway in the thickness direction from the outer surface alternate through the non-whitened areas. There is provided a bottom reinforced polyester bottle characterized in that
【００１３】本発明によればまた、ポリエステルの射出
成形で形成され且つ口頸部とこれに連なる側壁部と閉塞
底部とを備えた、ボトルへの二軸延伸ブロー成形に用い
るプリフォームにおいて、前記側壁部の下部には、周方
向に間隔をおいて縦方向或いはスパイラル方向に延びて
いる結晶化白化帯が非白化域を介して交互に設けられて
いることを特徴とする二軸延伸ブロー成形プリフォーム
が提供される。前記結晶化白化帯は側壁部の外表面から
厚み方向の途中に達するように白化されているのがよ
い。According to the present invention, there is also provided a preform which is formed by injection molding of polyester and has a mouth neck portion, a side wall portion continuous with the mouth neck portion, and a closed bottom portion, which is used for biaxial stretch blow molding of a bottle. Biaxially stretch blow molding, characterized in that crystallization whitening bands extending in the longitudinal direction or in the spiral direction at intervals in the circumferential direction are alternately provided at non-whitening regions in the lower portion of the side wall portion. Preforms are provided. It is preferable that the crystallized whitening zone is whitened so as to reach an intermediate portion in the thickness direction from the outer surface of the side wall portion.
【００１４】本発明によれば更に、ポリエステルの射出
成形で形成され、且つ口頸部とこれに連なる側壁部と閉
塞底部とを備えた、ボトルへの二軸延伸ブロー成形に用
いるプリフォームにおいて、前記側壁の下部には次第に
径が小さくなるテーパー状接続部を介して上部よりも小
径に且つ上部とほぼ同じ厚みに絞られた小径部が形成さ
れており、この接続部及び小径部には、頂部が側壁外周
面と面一となるように縦方向の外リブが周方向に間隔を
おいて設けられ且つ前記外リブの大部分が結晶化により
白化されていることを特徴とする二軸延伸ブロー成形用
プリフォームが提供される。According to the present invention, further, a preform formed by injection molding of polyester and having a mouth neck portion, a side wall portion continuous with the mouth neck portion, and a closed bottom portion, which is used for biaxial stretch blow molding into a bottle, A small-diameter portion is formed in the lower portion of the side wall, which has a diameter smaller than that of the upper portion through a tapered connecting portion and has a diameter substantially equal to that of the upper portion, and the connecting portion and the small-diameter portion are formed. Biaxial stretching characterized in that vertical outer ribs are provided at intervals in the circumferential direction such that the tops thereof are flush with the outer peripheral surface of the side wall, and most of the outer ribs are whitened by crystallization. A blow molding preform is provided.
【００１５】[0015]
【作用】本発明のボトルも、公知のボトルと同様に、ポ
リエステルの二軸延伸ブロー成形で製造され、口頸部と
これに連なる錐台状肩部と筒状の胴部と閉塞底部とを備
え、この底部は下向きに径が小さくなる外周部と、これ
に連なる接地部と、底中心部と、底中心部と接地部とを
接続する上向きに凸の湾曲部とを備えているが、湾曲部
及び接地部に、底部中心から少なくとも接地部迄放射状
に延びており且つ外表面から厚み方向の途中迄結晶化に
より白化された複数本の結晶化補強帯を非白化域を介し
て交互に設けたことが顕著な特徴である。Like the well-known bottle, the bottle of the present invention is also produced by biaxially stretch blow molding of polyester, and has a mouth neck portion, a frustum-shaped shoulder portion connected to the mouth neck portion, a cylindrical body portion, and a closed bottom portion. The bottom portion includes an outer peripheral portion having a diameter that decreases downward, a grounding portion that continues to this, a bottom center portion, and an upwardly convex curved portion that connects the bottom center portion and the grounding portion, A plurality of crystallization reinforcing bands that extend radially from the center of the bottom to at least the grounding part and that are whitened by crystallization halfway in the thickness direction from the outer surface are alternately provided to the curved part and the grounding part through the non-whitening region. The provision is a remarkable feature.
【００１６】ボトル底部の内、圧力及び熱に対して最も
弱い部分は、応力の集中し易い接地部及び接地部から湾
曲部に至る部分であり、これらの部分が膨出変形する
と、ボトルの自立安定性が損なわれたり、自立性が損な
われない場合にもボトルが横方向に揺れるロッキング現
象を生じたりする。また、この様な膨出変形を生じると
この部分にクラックが発生して、器壁の強度自体も低下
する傾向がある。The portion of the bottom of the bottle that is most vulnerable to pressure and heat is the grounding portion where stress is likely to concentrate and the portion from the grounding portion to the curved portion. When these portions bulge and deform, the bottle becomes self-supporting. If the stability is impaired or the independence is not impaired, the rocking phenomenon occurs in which the bottle sways in the lateral direction. Further, when such bulging deformation occurs, cracks occur in this portion, and the strength of the vessel wall itself tends to decrease.
【００１７】本発明では、これを防止するために、湾曲
部及び接地部に、底部中心から少なくとも接地部迄放射
状に延びる様に、複数本の結晶化補強帯を設ける。この
補強帯は、ポリエステルが結晶化されているため、剛性
が大きく、熱変形温度も高く、圧力、更に熱が加わった
場合にも、膨出変形を有効に防止する。In the present invention, in order to prevent this, the curved portion and the ground portion are provided with a plurality of crystallization reinforcing bands extending radially from the center of the bottom portion to at least the ground portion. Since the polyester is crystallized, the reinforcing band has high rigidity, a high heat deformation temperature, and effectively prevents bulging deformation even when pressure or heat is applied.
【００１８】この結晶化補強帯は、外表面から厚み方向
の途中迄結晶化されることにより形成されていること、
及び放射状であって、非白化域を介して交互に設けられ
ていることが特に重要である。即ち、本発明のこの底部
構造では、剛性のある結晶化（白化）補強帯が相互に独
立した傘骨構造となり、一方強靱性のある延伸ポリエス
テル層（補強帯の未白化部分＋非白化域）が連続した状
態で傘骨構造に支えられる傘布構造となり、底部器壁全
体が薄い構造でも、上からの圧力に十分に耐え、しかも
剛性と強靱性とが組み合わされたものとなっていること
が了解されよう。This crystallization-reinforcing band is formed by being crystallized from the outer surface to the middle of the thickness direction,
It is of particular importance that they are radial and are arranged alternately through the non-whitened areas. That is, in this bottom structure of the present invention, the rigid crystallized (whitened) reinforcing bands form an umbrella structure independent of each other, while the toughness stretched polyester layer (unwhitened portion of the reinforcing band + non-whitened region) The structure is a canopy structure that can be supported by the umbrella frame structure in a continuous state, and even if the entire bottom device wall is thin, it can withstand the pressure from above and is a combination of rigidity and toughness. Will be understood.
【００１９】本発明のこの底部構造のボトルは、ポリエ
ステルの射出成形で形成され且つ口頸部とこれに連なる
側壁部と閉塞底部とを備えたプリフォームであって、側
壁部の下部には、周方向に間隔をおいて縦方向或いはス
パイラル方向に延びている結晶化白化帯が非白化域を介
して交互に設けられているものを使用し、これを二軸延
伸ブロー成形することにより、製造される。The bottle having the bottom structure of the present invention is a preform formed by injection molding of polyester and having a mouth neck portion, a side wall portion continuous with the mouth neck portion, and a closed bottom portion. A crystallization whitening zone extending in the longitudinal direction or the spiral direction at intervals in the circumferential direction is provided alternately through non-whitening areas, and is produced by biaxial stretch blow molding. To be done.
【００２０】このプリフォームを二軸延伸ブロー成形に
使用すると、プリフォームの結晶化白化帯がボトル底部
の結晶化補強帯となり、またプリフォームの非白化域が
ボトル底部の非白化域となって、前述したボトル底部構
造が形成される。特に、プリフォームの結晶化白化帯
が、二軸延伸ブロー成形時に、変形が少なく、非白化域
の延伸開始固定端となるので、非白化域の延伸倍率が高
くなり、非白化域の分子配向が有効に行われるという利
点をももたらす。When this preform is used for biaxial stretch blow molding, the crystallization whitening zone of the preform becomes the crystallization reinforcement zone at the bottom of the bottle, and the non-whitening area of the preform becomes the non-whitening zone of the bottle bottom. The bottle bottom structure described above is formed. In particular, the crystallization whitening zone of the preform is less deformed during the biaxial stretch blow molding and becomes the stretch start fixed end of the non-whitening area, so the stretching ratio of the non-whitening area is high and the molecular orientation of the non-whitening area is high. Also brings the advantage of being effectively performed.
【００２１】本発明のボトルを製造するには、プリフォ
ームの状態で、加熱による結晶化乃至白化を行うので、
成形後のボトル底部を加熱する煩わしさがなく、工程が
簡単で、製造装置も大がかりなものを必要としないとい
う利点がある。更に、プリフォームの外周側から加熱す
るの加熱操作も容易であり、この外周側からの加熱で
は、プリフォームの結晶化白化帯は側壁部の外表面から
厚み方向の途中に達するように白化されるので、これに
より、前述した傘骨−傘布構造の形成が、二軸延伸ブロ
ー成形で容易に得られるという利点がある。In order to manufacture the bottle of the present invention, crystallization or whitening is performed by heating in a preform state.
There are advantages that the bottom of the bottle after molding is not bothered, the process is simple, and a large-scale manufacturing device is not required. Further, the heating operation of heating from the outer peripheral side of the preform is also easy, and by heating from this outer peripheral side, the crystallization whitening zone of the preform is whitened so as to reach the middle of the thickness direction from the outer surface of the side wall portion. Therefore, there is an advantage that the above-mentioned formation of the umbrella frame-canopy cloth structure can be easily obtained by the biaxial stretch blow molding.
【００２２】本発明の特に好適なプリフォームにおいて
は、プリフォーム側壁の下部に、次第に径が小さくなる
テーパー状接続部を介して上部よりも小径に且つ上部と
ほぼ同じ厚みに絞られた小径部を形成し、この接続部及
び小径部に、頂部が側壁外周面と面一となるように縦方
向の外リブを周方向に間隔をおいて設け、しかも外リブ
の大部分を結晶化により白化させる。In a particularly preferred preform of the present invention, a small-diameter portion is formed in the lower portion of the side wall of the preform, which has a diameter smaller than that of the upper portion and a thickness substantially equal to that of the upper portion via a tapered connecting portion having a gradually decreasing diameter. In this connection part and small diameter part, vertical outer ribs are provided at intervals in the circumferential direction so that the tops are flush with the outer peripheral surface of the side wall, and most of the outer ribs are whitened by crystallization. Let
【００２３】この構成の外リブでは、外リブを設けた部
分の壁の厚さが大きくなり、しかも外リブが結晶化され
ているため、十分な厚みの結晶化補強帯をボトル底部に
形成することが可能となる。ボトル底部となるプリフォ
ーム下部が、プリフォーム上部に比して小径に絞られて
いるので、この部分の周方向延伸倍率が大きくなり、ボ
トル底部の分子配向度も大きくできることも了解される
べきである。In the outer rib having this structure, the thickness of the wall where the outer rib is provided is large and the outer rib is crystallized. Therefore, a crystallization reinforcing band having a sufficient thickness is formed at the bottom of the bottle. It becomes possible. It should be understood that the lower part of the preform, which is the bottom of the bottle, is narrowed to a smaller diameter than the upper part of the preform, so that the draw ratio in the circumferential direction of this part is large and the degree of molecular orientation of the bottom of the bottle can also be large. is there.
【００２４】また、外リブが他の側壁下部に比して径外
方に突出しているので、周囲からプリフォームを加熱し
たとき、外リブのみを選択的に熱結晶化できるという利
点を与える。この様に、外リブに熱が集中するので、本
発明によれば、プリフォームを延伸温度に加熱するため
の熱処理の段階で、外リブを熱結晶化でき、工程数も少
なくして、生産性を向上させ得るといういう利点を与え
る。Further, since the outer rib projects radially outward as compared with the lower portion of the other side wall, when the preform is heated from the surroundings, only the outer rib can be selectively thermally crystallized. As described above, since heat is concentrated on the outer ribs, according to the present invention, the outer ribs can be thermally crystallized at the stage of the heat treatment for heating the preform to the stretching temperature, and the number of steps can be reduced, and the production can be performed. It provides the advantage that the property can be improved.
【００２５】[0025]
【実施例】本発明を、その理解が容易なように、ボトル
形成用のプリフォームから説明する。The present invention will be described with reference to a preform for forming a bottle so that the invention can be easily understood.
【００２６】［プリフォーム］本発明の好適なプリフォ
ームを示す図１（側面図）及び図２（図１のＡ−Ａ、Ｂ
−Ｂ，Ｃ−Ｃ，Ｄ−Ｄ及びＥ−Ｅの断面図）において、
このプリフォームＰは、ポリエステルの射出成形により
形成され、大別して、口頸部１と、これに上方接続部２
を介して連なる側壁部３と閉塞底部４とを備えている。
口頸部１は密封用開口端５、蓋係合用ネジ部６及び支持
リング７を備えている。この具体例において、上方接続
部２は、口頸部１と内径がほぼ同一であるが、外径が下
向きに増大して、肉厚も下向きに増大している。閉塞底
部４は丸底となっている。[Preform] FIG. 1 (side view) and FIG. 2 (A-A, B in FIG. 1) showing a preferred preform of the present invention.
-B, CC, DD and EE sectional views),
The preform P is formed by injection molding of polyester, and is roughly classified into a mouth / neck portion 1 and an upper connection portion 2 therefor.
It has a side wall portion 3 and a closed bottom portion 4 which are continuous with each other.
The mouth / neck portion 1 includes an opening end 5 for sealing, a screw portion 6 for engaging a lid, and a support ring 7. In this specific example, the upper connecting portion 2 has an inner diameter substantially the same as that of the mouth / neck portion 1, but the outer diameter increases downward and the wall thickness also increases downward. The closed bottom portion 4 has a round bottom.
【００２７】側壁３は上部８、下部９及びこれらの間の
テーパ状接続部１０とから成っている。テーパ状接続部
１０は下向きに次第に径（内径及び外径共）が小さくな
るものであり、下部９はこのテーパー状接続部１０を介
して上部８よりも小径に且つ上部９とほぼ同じ厚みに絞
られて、小径部を形成している。The side wall 3 comprises an upper portion 8, a lower portion 9 and a tapered connecting portion 10 therebetween. The diameter of the tapered connection portion 10 (both inner diameter and outer diameter) gradually decreases downward, and the lower portion 9 has a diameter smaller than that of the upper portion 8 and substantially the same thickness as the upper portion 9 via the tapered connection portion 10. It is squeezed to form a small diameter portion.
【００２８】この接続部１０及び小径部（下部）９に
は、図２によく示されるように、頂部１１が側壁外周面
１２と面一となるように縦方向の外リブ１３が周方向に
間隔をおいて多数（図の具体例では８本）設けられてい
る。As shown in FIG. 2, the connecting portion 10 and the small-diameter portion (lower portion) 9 are provided with longitudinal outer ribs 13 in the circumferential direction so that the top portion 11 is flush with the side wall outer peripheral surface 12. A large number (8 in the illustrated specific example) are provided at intervals.
【００２９】本発明では、これらの外リブ１３を熱結晶
化により白化するが、外リブ以外の小径部（下部）９は
非白化域となっている。外リブ１３はその断面でみて大
部分が熱結晶化により白化して結晶化白化帯１４と成っ
ているが、必ずしも全部が白化していることを必要とし
ない（尚、この具体例においては、外リブ１３と結晶化
白化帯１４とは重複している）。勿論、外リブ１３より
も内側の部分は非白化域となっていることが了解される
べきである。In the present invention, these outer ribs 13 are whitened by thermal crystallization, but the small-diameter portion (lower part) 9 other than the outer ribs is a non-whitening region. The outer rib 13 is mostly whitened by thermal crystallization to form a crystallization whitening zone 14 in its cross section, but it does not necessarily need to be entirely whitened (in this specific example, The outer rib 13 and the crystallization whitening zone 14 overlap). Of course, it should be understood that the portion inside the outer rib 13 is a non-whitened area.
【００３０】外リブ１３の結晶化の程度は、この部分が
白化していれば十分であるが、厳密には、密度法結晶化
度で評価できる。この結晶化度が、２５％以上、特に３
５％以上であれば、十分な耐熱性と耐圧性とを付与する
ことができる。The degree of crystallization of the outer rib 13 is sufficient if this portion is whitened, but strictly speaking, it can be evaluated by the density method crystallinity. This crystallinity is 25% or more, especially 3
If it is 5% or more, sufficient heat resistance and pressure resistance can be imparted.
【００３１】尚、密度法結晶化度とは、密度勾配管法に
よりポリエステルの密度を測定し、結晶化度Ｘ（％）を
次式によって求められた値である。The crystallinity by the density method is a value obtained by measuring the density of polyester by a density gradient tube method and determining the crystallinity X (%) by the following equation.
【数１】ただし、ｄは２５℃における測定密度（g/cm3 ）、ｄa
＝1.335g/cm3（完全非晶質ポリエステルの密度）、ｄc
＝1.455g/cm3（完全結晶ポリエステルの密度）。[Equation 1] Where d is the measured density (g / cm3) at 25 ° C, da
= 1.335 g / cm3 (density of completely amorphous polyester), dc
= 1.455 g / cm3 (density of fully crystalline polyester).
【００３２】外リブ１３の形状は特に制限されないが、
図に示す具体例では、半円形であり、他に、放物線、双
曲線、楕円等の二次曲線や、サイクロイド、三角形、台
形等の任意の形状をとりうる。The shape of the outer rib 13 is not particularly limited,
In the specific example shown in the figure, it is semicircular, and in addition, it can take a quadratic curve such as a parabola, a hyperbola, an ellipse, or any shape such as a cycloid, a triangle, or a trapezoid.
【００３３】外リブ１３の大きさは、容器の大きさによ
っても変化し、一概に規定できないが、通常の包装容
器、例えば内容量１５００ｍｌ入りボトルの場合、外リ
ブ１３の高さは、１５乃至４０ｍｍ、特に２０乃至３０
ｍｍの範囲に、またその幅は２乃至８ｍｍ、特に３乃至
５ｍｍの範囲にあるのが好ましい。また、プリフォーム
下部に設ける外リブ１３の本数は、一般に３乃至１２
本、特に５乃至１０本程度であることが好ましい。更
に、外リブ１３の長さは、ボトル底部の中心部から接地
部までの距離にほぼ見合ったものであり、ボトルの大き
さにもよるが、一般に２０乃至１００ｍｍ、特に３０乃
至６０ｍｍの範囲にあるのが好ましい。The size of the outer rib 13 varies depending on the size of the container and cannot be specified unconditionally, but in the case of an ordinary packaging container, for example, a bottle with an internal capacity of 1500 ml, the height of the outer rib 13 is 15 to 15. 40 mm, especially 20 to 30
The width is preferably in the range of 2 mm to 8 mm, particularly 3 to 5 mm. The number of outer ribs 13 provided on the lower part of the preform is generally 3 to 12.
It is preferable that the number is about 5, especially about 5 to 10. Further, the length of the outer rib 13 is almost commensurate with the distance from the center of the bottom of the bottle to the ground contact portion, and it depends on the size of the bottle, but is generally 20 to 100 mm, and particularly 30 to 60 mm. Preferably.
【００３４】本発明のプリフォームは、熱可塑性ポリエ
ステルから成る。熱可塑性ポリエステルとしては、エチ
レンテレフタレート単位を主体とする熱可塑性ポリエス
テル、例えばポリエチレンテレフタレート（ＰＥＴ）や
グリコール成分としてヘキサヒドロキシリレングリコー
ル等の他のグリコール類の少量を含有せしめ或いは二塩
基酸成分としてイソフタル酸やヘキサヒドロテレフタル
酸等の他の二塩基酸成分の少量を含有せしめた所謂、改
質ＰＥＴ等が使用される。これらのポリエステルは、単
独でも或いはその本質を損なわない範囲で小量のナイロ
ン類、ポリカーボネート或いはポリアリレート等の他の
樹脂とのブレンド物の形でも使用し得る。また、熱可塑
性ポリエステルを内外層とし、エチレンビニルアルコー
ル共重合体やメタキシリレンアジパミド等の半芳香族ナ
イロン等のガスバリアー性樹脂中間層との多層構造であ
ってもよい。The preform of the present invention comprises a thermoplastic polyester. As the thermoplastic polyester, a thermoplastic polyester mainly composed of ethylene terephthalate units, for example, polyethylene terephthalate (PET) or a small amount of other glycols such as hexahydroxyrylene glycol as a glycol component, or isophthalic acid as a dibasic acid component. A so-called modified PET containing a small amount of other dibasic acid components such as hexahydroterephthalic acid and the like is used. These polyesters may be used alone or in the form of a blend with a small amount of other resins such as nylons, polycarbonate or polyarylate, as long as the essence thereof is not impaired. Further, it may have a multilayer structure with thermoplastic polyester as the inner and outer layers and an intermediate layer of a gas barrier resin such as semi-aromatic nylon such as ethylene vinyl alcohol copolymer or metaxylylene adipamide.
【００３５】用いる熱可塑性ポリエステルの固有粘度
（η）はボトル形成用グレードでよく、ＥＶＯＨやＭＸ
−ナイロン等との多層構成も含める。０．６５ｄｌ／ｇ
以上、特に０．７０乃至０．９０ｄｌ／ｇの範囲にあ
り、且つジエチレングリコール単位の含有量が１．６０
重量％以下、特に１．５０重量％以下の範囲内にあるも
のが好適に使用される。The intrinsic viscosity (η) of the thermoplastic polyester used may be a bottle forming grade, such as EVOH or MX.
-Including a multi-layer structure such as nylon. 0.65dl / g
Above, especially in the range of 0.70 to 0.90 dl / g, and the content of diethylene glycol units is 1.60.
Those in the range of not more than 1% by weight, particularly not more than 1.50% by weight are preferably used.
【００３６】延伸ブロー成形に使用するプリフォーム
は、それ自体公知の射出成形法で製造される。即ち、溶
融ポリエステルを射出し、最終容器に対応する口頸部を
備えた前記形状の有底プリフォームを非晶質の状態で製
造する。射出条件等は、特に限定されたものではない
が、一般に、２６０乃至３００℃の射出温度、３０乃至
６０ｋｇ／ｃｍ2 の射出圧力で、プリフォームを成形す
ることができる。The preform used for stretch blow molding is manufactured by an injection molding method known per se. That is, molten polyester is injected, and the bottomed preform having the above-described shape and having the mouth-neck portion corresponding to the final container is manufactured in an amorphous state. The injection conditions and the like are not particularly limited, but generally, the preform can be molded at an injection temperature of 260 to 300 ° C. and an injection pressure of 30 to 60 kg / cm2 .
【００３７】かくして得られたプリフォームに耐熱性、
剛性を与えるため、プリフォームの段階で螺合部、嵌合
部、支持リング等を有する口頚部を熱処理により結晶化
し白化せしめる場合があり、一方後述の２軸延伸ブロー
を完了したるものをボトル成形完了後、未延伸部分の口
頚部を結晶化し、白化する場合もある。本発明のプリフ
ォームにおいて、結晶化補強帯は外リブに形成されてい
るのが、最も好ましいが、必ずしもこの例に限定されな
い。The preform thus obtained has heat resistance,
In order to provide rigidity, the neck and neck with screwing parts, fitting parts, support rings, etc. may be crystallized and whitened by heat treatment at the stage of preform, while those that have completed the biaxial stretching blow described later are bottles. After the completion of molding, the mouth and neck of the unstretched portion may be crystallized and whitened. In the preform of the present invention, it is most preferable that the crystallization reinforcing band is formed on the outer rib, but it is not necessarily limited to this example.
【００３８】プリフォームの他の例を示す図３（一部断
面側面図及び底面図）において、このプリフォームＰ
は、ポリエステルの射出成形により形成され、やはり口
頸部１と、これに上方接続部２を介して連なる側壁部３
と閉塞底部４とを備えているが、底部４から胴部の下方
部分９に放射状に延びている複数本の結晶化白化帯１４
が設けられている。この結晶化白化帯１４は、外表面か
ら厚み方向の途中に達するようなものであり、成形後の
プリフォームを熱処理することにより形成される。In FIG. 3 (partial sectional side view and bottom view) showing another example of the preform, the preform P is shown.
Is formed by injection molding of polyester, and is also a mouth / neck portion 1 and a side wall portion 3 connected to the mouth / neck portion 1 via an upper connecting portion 2.
And a closed bottom 4, but a plurality of crystallization whitening zones 14 extending radially from the bottom 4 to the lower part 9 of the body.
Is provided. The crystallized whitening zone 14 extends from the outer surface partway in the thickness direction, and is formed by heat-treating the preform after molding.
【００３９】この熱処理を説明するための図４におい
て、成形されたプリフォームＰに、底部結晶化用マスキ
ングユニット１５を使用し、プリフォームＰの底部外面
にこのユニット１５をはめ込み、結晶化のための熱処理
を行う。ユニット１５は、熱遮断壁１６と、結晶化白化
帯形成用の開口した窓１７とを有しており、この窓を通
過した赤外線により、窓１７に対応する形状及び寸法の
結晶化白化帯がプリフォーム２に形成される。この場合
には、結晶化白化帯形成用の加熱と、プリフォームの延
伸温度への加熱とは、処理温度が異なるので、一般に２
段に行われる。In FIG. 4 for explaining this heat treatment, a masking unit 15 for bottom crystallization is used for the molded preform P, and the unit 15 is fitted to the outer surface of the bottom of the preform P for crystallization. Heat treatment of. The unit 15 has a heat shield wall 16 and an opening window 17 for forming a crystallization whitening band, and infrared rays passing through this window cause a crystallization whitening band having a shape and size corresponding to the window 17. The preform 2 is formed. In this case, the heating temperature for forming the crystallization whitening zone and the heating temperature for stretching the preform are different from each other.
Done in steps.
【００４０】本発明のプリフォームＰにおいて、結晶化
補強帯１４は底部に放射状に設けられ、胴部下部にも軸
方向に若干延びているが、底部中心から径外方向に延び
ておればよく、例えば螺旋状に白化帯が延びていてもよ
い。In the preform P of the present invention, the crystallization reinforcing bands 14 are radially provided on the bottom part and extend a little in the axial direction to the lower part of the body part as long as they extend radially outward from the center of the bottom part. For example, the whitening zone may extend spirally.
【００４１】プリフォームの更に他の例を示す図５（一
部断面側面図及び底面図）において、このプリフォーム
Ｐは、全体としての構造は図４と共通しているが、底部
４の中心から胴部の下方部分９に螺旋状に延びている複
数本の結晶化白化帯１４が設けられている点が相違して
いる。この結晶化白化帯１４も、外表面から厚み方向の
途中に達するようなものであり、成形後のプリフォーム
を図４と同様に熱処理することにより形成される。In FIG. 5 (partial cross-sectional side view and bottom view) showing still another example of the preform, the preform P has the same overall structure as that of FIG. It is different in that a plurality of crystallization whitening bands 14 spirally extending from the to lower part 9 of the body are provided. The crystallized whitening zone 14 also reaches from the outer surface partway in the thickness direction, and is formed by heat-treating the preform after molding as in FIG.
【００４２】［ボトル］本発明の耐熱乃至耐熱圧ボトル
の全体の配置の一例を示す図６、図７及び図８（一部断
面側面図）において、この耐熱乃至耐圧ボトルＢは、筒
状の胴部２１、胴部の上端に接続された釣鐘状（錐体
状）の肩部２２、肩部上方のサポートリング２３及びリ
ング上方のノズル部２４から成る口頸部２５を備えてい
る。筒状の胴部２１の下端には、以下に詳細に説明する
底部２６が設けられている。[Bottle] In FIGS. 6, 7 and 8 (partially sectional side view) showing an example of the overall arrangement of the heat-resistant or heat-resistant pressure bottle of the present invention, this heat-resistant or pressure-resistant bottle B has a cylindrical shape. It has a body portion 21, a bell-shaped (conical) shoulder portion 22 connected to the upper end of the body portion, a support ring 23 above the shoulder portion, and a mouth / neck portion 25 composed of a nozzle portion 24 above the ring. A bottom portion 26, which will be described in detail below, is provided at the lower end of the tubular body portion 21.
【００４３】本発明の耐熱及び／又は耐圧ボトルＢにお
ける底部２６は、下向きに径が小さくなる外周部２７
と、これに連なる接地部２８と、底中心部２９と、底中
心部２９と接地部２８とを接続する上向きに凸の湾曲部
３０とから成っている。The bottom portion 26 of the heat-resistant and / or pressure-resistant bottle B of the present invention has an outer peripheral portion 27 whose diameter decreases downward.
And a ground portion 28 connected to the ground portion 28, a bottom center portion 29, and an upwardly convex curved portion 30 connecting the bottom center portion 29 and the ground portion 28.
【００４４】図６に示す具体例においては、底外周部２
７は、下向き且つ外向きに凸の曲線をなしており、この
ものは、ボトルの座りの良い耐熱ボトルとして有用であ
る。図７に示す具体例においては、底外周部２７は、上
向き且つ内向きに凸の曲線をなしていると共に、接地部
２８が下向きの突出しており、このものは、底部の圧力
に対する座屈のない耐圧ボトルとして有用である。図８
に示す具体例においては、底外周部２７は図７のものと
同様であるが、接地部２８からの底中心部２９の高さが
高く、湾曲部３０の曲率も大きくなっており、より底の
変形が厳しくなる用途、例えば、耐熱圧ボトルとしての
用途に有用である。これら何れの場合にも接地部２８の
内側の立ち上がりは９０度或いは９０度に近い急激な立
ち上がりをしていることが耐圧性の点でよい。In the embodiment shown in FIG. 6, the bottom outer peripheral portion 2
No. 7 has a downwardly and outwardly convex curve, which is useful as a heat-resistant bottle with a good sitting quality. In the specific example shown in FIG. 7, the bottom outer peripheral portion 27 has an upwardly and inwardly convex curved line, and the ground contact portion 28 projects downward, which causes buckling with respect to the pressure of the bottom portion. Not useful as a pressure resistant bottle. Figure 8
In the concrete example shown in FIG. 7, the bottom outer peripheral portion 27 is similar to that of FIG. 7, but the height of the bottom central portion 29 from the ground contact portion 28 is high, and the curvature of the curved portion 30 is also large, so It is useful for applications where the deformation of the bottle becomes severe, for example, applications as a heat and pressure bottle. In any of these cases, it is good in terms of pressure resistance that the inside of the grounding portion 28 rises at 90 degrees or a sharp rise near 90 degrees.
【００４５】本発明では、これらの湾曲部３０及び接地
部２８に、底部中心２９から少なくとも接地部２８迄放
射状（螺旋状も含む）に延びており且つ外表面から厚み
方向の途中迄結晶化により白化された複数本の結晶化補
強帯を非白化域を介して交互に設ける。In the present invention, the curved portion 30 and the ground contact portion 28 extend radially (including a spiral shape) from the bottom center 29 to at least the ground contact portion 28, and are crystallized from the outer surface to the middle in the thickness direction. A plurality of whitened crystallization reinforcing bands are provided alternately through the non-whitened areas.
【００４６】図６のボトル底部２６を幾分模式化して示
す図９（底面図）及び図６におけるＸ−Ｘ軸方向円周断
面展開図（図１０）において、湾曲部３０及び接地部２
８には、複数本（図では１０本）の放射状の結晶化補強
帯３１（斜線で示す。）が形成されている。結晶化補強
帯３１の間には非白化域３２が位置しており、これらは
交互に配置されている。結晶化補強帯３１は、底部中心
２９との境界から、少なくとも接地部２８を通るように
放射状に延びていることが了解されよう。In FIG. 9 (bottom view) showing the bottle bottom portion 26 of FIG. 6 in a somewhat schematic manner and the circumferential sectional development view (FIG. 10) of the XX axis direction in FIG. 6, the bending portion 30 and the grounding portion 2 are shown.
A plurality of (10 in the figure) radial crystallization reinforcing bands 31 (indicated by diagonal lines) are formed in 8. The non-whitened areas 32 are located between the crystallization reinforcement zones 31, and these areas are arranged alternately. It will be appreciated that the crystallization reinforcement zone 31 extends radially from the boundary with the bottom center 29, at least through the ground portion 28.
【００４７】図１０の断面展開図に最もよく示されるよ
うに、結晶化補強帯３１は底部の下面から底壁の厚み方
向の途中に至るように形成されており、その上方は非白
化域３２で覆われている。図１０に示す具体例では、結
晶化補強帯３１及びその近傍において、他の部分に比し
てやや厚肉に盛り上がっており、傘骨−傘布構造をより
強固なものとしている。図９のものでは、結晶化補強帯
３１は、接地部２８の外縁に至るように形成されている
が、勿論これを通り過ぎて底外周部或いは更に胴部の下
端縁にまで達していてもよい。As best shown in the sectional development view of FIG. 10, the crystallization reinforcing band 31 is formed so as to extend from the lower surface of the bottom portion to the middle in the thickness direction of the bottom wall, and the upper portion thereof is the non-whitened region 32. Is covered with. In the specific example shown in FIG. 10, the crystallization reinforcement band 31 and the vicinity thereof are slightly thicker than the other parts, which makes the umbrella-umbrella structure stronger. In FIG. 9, the crystallization reinforcing band 31 is formed so as to reach the outer edge of the ground contact portion 28, but of course it may pass through this and reach the outer periphery of the bottom or even the lower end edge of the body portion. .
【００４８】本発明において、結晶化補強帯の平均的な
厚み、幅、長さ及び結晶化度等は、二軸延伸ブロー成形
における変化が少ないので、プリフォームのそれと殆ど
等しいが、若干幅が広がり、厚みが減少する場合もあ
る。本発明において、接地部の内径、湾曲部の外径
（Ｄ）は一般に５０乃至７０ｍｍ，底中心部の高さ
（Ｈ）は一般に１５乃至３０ｍｍの範囲にあるのがよ
い。本発明のボトル胴部は勿論、それ自体公知の胴部構
造を有することができ、例えば、縁取られたラベル貼着
部や、減圧吸収用のパネル−リブ構造を有していてもよ
い。In the present invention, the average thickness, width, length, crystallinity and the like of the crystallization reinforcing band are almost the same as those of the preform because the change in biaxial stretch blow molding is small, but the width is slightly different. It may spread and the thickness may decrease. In the present invention, the inner diameter of the grounding portion and the outer diameter (D) of the curved portion are generally in the range of 50 to 70 mm, and the height (H) of the center of the bottom is generally in the range of 15 to 30 mm. The bottle body of the present invention may of course have a body structure known per se, and may have, for example, a rimmed label attachment portion or a panel-rib structure for absorbing reduced pressure.
【００４９】本発明のボトルは、前述した結晶化白化帯
が形成されたブロー成形用プリフォームを、延伸温度、
一般に９５乃至１２０の温度で二軸延伸ブローする。中
空金型内に、上記温度に予備加熱されたプリフォームを
装着し、該プリフォームを周方向に膨張延伸させると共
に、軸方向に引っ張り延伸させ、且つ底打ちをする。The bottle of the present invention comprises a blow molding preform having the above-mentioned crystallization whitening zone formed at a stretching temperature,
Biaxial stretch blowing is generally carried out at temperatures of 95 to 120. A preform preheated to the above temperature is mounted in the hollow mold, and the preform is expanded and stretched in the circumferential direction, stretched and stretched in the axial direction, and bottomed.
【００５０】最終容器における延伸倍率は、面積倍率で
５乃至１４倍、特に７乃至１２倍が適当であり、一方軸
方向延伸線倍率は２乃至３．５倍、特に２．５乃至３倍
とし、周方向延伸線倍率は２乃至５倍、特に３乃至４倍
とするのがよい。The stretching ratio in the final container is preferably 5 to 14 times, particularly 7 to 12 times in terms of area ratio, while the axial stretching linear ratio is 2 to 3.5 times, particularly 2.5 to 3 times. The draw ratio in the circumferential direction is preferably 2 to 5 times, more preferably 3 to 4 times.
【００５１】実施例１.射出用グレードのポリエチレン
テレフタレート（ＰＥＴ）を、３００℃の温度で射出し
て、図１及び図２に示す形状のプリフォームを製造し
た。各部の寸法は次の通りである。Example 1 Injection grade polyethylene terephthalate (PET) was injected at a temperature of 300 ° C. to produce a preform having the shape shown in FIGS. 1 and 2. The dimensions of each part are as follows.
【００５２】ＰＥＴ目付量 ６３ｇ， 口径 ２８ｍｍ， 全高 １４７．５ｍｍ， 胴上部外径 ２９．３ｍｍ， 胴上部内径 １９．８ｍｍ， 胴下部外径 ２８ｍｍ， 胴下部内径 １９ｍｍ， 胴下部長さ ４０ｍｍ， 外リブ長さ ４０ｍｍ， 外リブ高さ ２．６ｍｍ， 外リブ幅 ５ｍｍ。PET basis weight 63 g, caliber 28 mm, total height 147.5 mm, upper body outer diameter 29.3 mm, upper body inner diameter 19.8 mm, lower body outer diameter 28 mm, lower body inner diameter 19 mm, lower body length 40 mm, outer ribs Length 40 mm, outer rib height 2.6 mm, outer rib width 5 mm.
【００５３】上記外リブ付きプリフォームを回転させな
がら、赤外線加熱器により加熱し、プリフォーム全体を
延伸温度に予備加熱すると共に、外リブを結晶化により
白化させた。外リブの表面温度は１４０℃で白化した
が、それ以外の部分は白化していないことが確認され
た。外リブの結晶化度は、３５％であり、それ以外のと
ころの結晶化度は、１５％であった。外リブにおいて、
最も厚い部分での白化厚みは３ｍｍであった。While rotating the preform with outer ribs, the preform was preheated to the stretching temperature while being heated by an infrared heater while the outer ribs were whitened by crystallization. It was confirmed that the surface temperature of the outer ribs was whitened at 140 ° C., but the other portions were not whitened. The crystallinity of the outer rib was 35%, and the crystallinity of other parts was 15%. In the outer rib,
The whitening thickness in the thickest part was 3 mm.
【００５４】このプリフォームを、公知の二軸延伸ブロ
ー成形装置で、下記寸法のボトルに成形した。 内容積 １５００ｍｌ， 口径 ２８ｍｍ， 全高 ３０５ｍｍ， 胴部最大径 ９８ｍｍ， 底部 接地部の内径（Ｄ） ６０ｍｍ， 中心部の高さ（Ｈ） ２０ｍｍ， Ｈ／Ｄの比 ０．３３This preform was molded into a bottle having the following size by a known biaxial stretch blow molding device. Inner volume 1500 ml, caliber 28 mm, total height 305 mm, trunk maximum diameter 98 mm, bottom part grounding part inner diameter (D) 60 mm, center part height (H) 20 mm, H / D ratio 0.33
【００５５】上記ボトルに、８５℃の熱水８００ｇを充
填し３分間放置した後、熱水を取り除き、パック前の接
地面からの底中心の高さと、パック後のそれとを比較し
た。高さの変化量は１．５５ｍｍであった。The above bottle was filled with 800 g of hot water at 85 ° C. and left for 3 minutes, then the hot water was removed, and the height of the bottom center from the ground contact surface before packing was compared with that after packing. The amount of change in height was 1.55 mm.
【００５６】比較のため、実施例１と同じ目つけ量のプ
リフォームで、結晶化されていないものを用いる以外
は、上記と同様にして、ボトルを製造した。このボトル
について、上記と同様の試験を行ったところ、高さの変
化量は、４．３０ｍｍであり、本発明のボトルが熱安定
性に顕著に優れていた。For comparison, a bottle was produced in the same manner as described above, except that the preform having the same basis weight as in Example 1 and not crystallized was used. When this bottle was tested in the same manner as above, the height change was 4.30 mm, and the bottle of the present invention was remarkably excellent in thermal stability.
【００５７】[0057]
【発明の効果】本発明によれば、下向きに径が小さくな
る外周部と、これに連なる接地部と、底中心部と、底中
心部と接地部とを接続する上向きに凸の湾曲部とを備え
ている二軸延伸ブロー成形ボトルにおいて、これらの湾
曲部及び接地部に、底部中心から少なくとも接地部迄放
射状に延びており且つ外表面から厚み方向の途中迄結晶
化により白化された複数本の結晶化補強帯を非白化域を
介して交互に設けたことにより、容器底部の全体として
の厚みを比較的小さいレベルに保ちながら、十分な補強
効果と、それによる耐圧性と耐熱性とが得られる。According to the present invention, an outer peripheral portion having a downwardly reduced diameter, a grounding portion connected to the outer peripheral portion, a bottom center portion, and an upwardly convex curved portion connecting the bottom center portion and the grounding portion. In a biaxially stretched blow-molded bottle, a plurality of bottles that extend radially from the center of the bottom portion to at least the grounding portion and are whitened by crystallization halfway from the outer surface to the middle portion in the thickness direction at the curved portion and the grounding portion. By alternately providing the crystallization-reinforcing zones of the non-whitening region, while maintaining the overall thickness of the bottom of the container at a relatively small level, a sufficient reinforcing effect and the resulting pressure resistance and heat resistance can be obtained. can get.
【００５８】この補強帯は、ポリエステルが結晶化され
ているため、剛性が大きく、熱変形温度も高く、圧力、
更に熱が加わった場合にも、膨出変形を有効に防止す
る。この結晶化補強帯は、外表面から厚み方向の途中迄
結晶化されることにより形成され、しかも放射状であっ
て、非白化域を介して交互に設けられているため、剛性
のある結晶化（白化）補強帯が相互に独立した傘骨構造
となり、一方強靱性のある延伸ポリエステル層（補強帯
の未白化部分＋非白化域）が連続した状態で傘骨構造に
支えられる傘布構造となり、底部器壁全体が薄い構造で
も、上からの圧力に十分に耐え、しかも剛性と強靱性と
が組み合わされたものとなっている。Since this reinforcing band is made of crystallized polyester, it has high rigidity, high heat distortion temperature, pressure,
Even when heat is further applied, bulging deformation is effectively prevented. The crystallization reinforcing bands are formed by being crystallized from the outer surface to the middle of the thickness direction, and are radial, and are alternately provided via the non-whitened regions, so that the crystallization with rigidity ( Whitening) The reinforcing bands have an independent umbrella frame structure, while the tough stretched polyester layer (unwhitened portion of the reinforcing band + non-whitened region) has a continuous umbrella cloth structure supported by the umbrella frame structure, Even if the entire bottom wall is thin, it can withstand pressure from above and is a combination of rigidity and toughness.
【００５９】本発明のこの底部構造のボトルは、側壁部
の下部には、周方向に間隔をおいて縦方向或いはスパイ
ラル方向に延びている結晶化白化帯が非白化域を介して
交互に設けられているプリフォームを使用し、これを二
軸延伸ブロー成形することにより、製造されるので、後
からの熱処理による結晶化工程が不要であり、製造も容
易であるという利点をもたらす。また、プリフォームの
結晶化白化帯が、二軸延伸ブロー成形時に、変形が少な
く、非白化域の延伸開始固定端となるので、非白化域の
延伸倍率が高くなり、非白化域の分子配向が有効に行わ
れるという利点をももたらす。In the bottle having the bottom structure of the present invention, the crystallization whitening zones extending in the longitudinal direction or the spiral direction at intervals in the circumferential direction are alternately provided on the lower portion of the side wall portion through the non-whitening areas. Since it is manufactured by using a preform that has been used and biaxially stretch-blow-molding it, there is no need for a crystallization step by a subsequent heat treatment, and the manufacturing is easy. In addition, the crystallized whitening zone of the preform is less deformed during biaxial stretch blow molding and becomes the stretch start fixed end of the non-whitened area, so the draw ratio of the non-whitened area is high and the molecular orientation of the non-whitened area is high. Also brings the advantage of being effectively performed.
【００６０】本発明では、プリフォームの状態で、加熱
による結晶化乃至白化を行うので、成形後のボトル底部
を加熱する煩わしさがなく、工程が簡単で、製造装置も
大がかりなものを必要としないという利点がある。更
に、プリフォームの外周側から加熱するの加熱操作も容
易であり、この外周側からの加熱では、プリフォームの
結晶化白化帯は側壁部の外表面から厚み方向の途中に達
するように白化されるので、これにより、前述した傘骨
−傘布構造の形成が、二軸延伸ブロー成形で容易に得ら
れるという利点がある。In the present invention, since crystallization or whitening is performed by heating in the state of the preform, there is no need to heat the bottom of the bottle after molding, the process is simple, and the manufacturing apparatus is large. There is an advantage of not doing it. Further, the heating operation of heating from the outer peripheral side of the preform is also easy, and by heating from this outer peripheral side, the crystallization whitening zone of the preform is whitened so as to reach the middle of the thickness direction from the outer surface of the side wall portion. Therefore, there is an advantage that the above-mentioned formation of the umbrella frame-canopy cloth structure can be easily obtained by the biaxial stretch blow molding.
【００６１】特に外リブを設けたプリフォームでは、こ
の外リブが他の側壁下部に比して径外方に突出している
ので、周囲からプリフォームを加熱したとき、外リブの
みを選択的に熱結晶化できるという利点を与える。この
様に、外リブに熱が集中するので、本発明によれば、プ
リフォームを延伸温度に加熱するための熱処理の段階
で、外リブを熱結晶化でき、工程数も少なくして、生産
性を向上させ得るといういう利点を与える。Particularly, in a preform provided with outer ribs, the outer ribs project radially outward as compared with the lower portions of the other side walls. Therefore, when the preform is heated from the surroundings, only the outer ribs are selectively selected. It gives the advantage that it can be thermally crystallized. As described above, since heat is concentrated on the outer ribs, according to the present invention, the outer ribs can be thermally crystallized at the stage of the heat treatment for heating the preform to the stretching temperature, and the number of steps can be reduced, and the production can be performed. It provides the advantage that the property can be improved.
【図１】本発明の好適なプリフォームを示す側面図であ
る。FIG. 1 is a side view showing a preferred preform of the present invention.
【図２】図１のＡ−Ａ、Ｂ−Ｂ，Ｃ−Ｃ，Ｄ−Ｄ及びＥ
−Ｅの断面図であり、Ａ，Ｂ，Ｃ，Ｄ及びＥはＡ−Ａ、
Ｂ−Ｂ，Ｃ−Ｃ，Ｄ−Ｄ及びＥ−Ｅの断面に相当する。FIG. 2 is AA, BB, CC, DD and E of FIG.
-E is a sectional view of A, B, C, D and E are AA,
It corresponds to the cross section of B-B, C-C, D-D and E-E.
【図３】本発明のプリフォームの他の例を示す一部断面
側面図及び底面図である。FIG. 3 is a partial cross-sectional side view and bottom view showing another example of the preform of the present invention.
【図４】図３のプリフォームを形成するための熱処理を
説明するための説明図である。FIG. 4 is an explanatory diagram for explaining heat treatment for forming the preform of FIG.
【図５】本発明のプリフォームの更に他の例を示す一部
断面側面図及び底面図である。FIG. 5 is a partial cross-sectional side view and bottom view showing still another example of the preform of the present invention.
【図６】本発明の耐熱ボトルの一例の全体の配置の一例
を示す一部断面側面図である。FIG. 6 is a partial cross-sectional side view showing an example of the overall arrangement of an example of the heat-resistant bottle of the present invention.
【図７】本発明の耐圧ボトルの一例の全体の配置の一例
を示す一部断面側面図である。FIG. 7 is a partial cross-sectional side view showing an example of the overall arrangement of an example of the pressure resistant bottle of the present invention.
【図８】本発明の耐熱圧ボトルの一例の全体の配置の一
例を示す一部断面側面図である。FIG. 8 is a partial cross-sectional side view showing an example of the overall arrangement of an example of the heat resistant pressure bottle of the present invention.
【図９】図６のボトル底部を幾分模式化して示す底面図
である。FIG. 9 is a bottom view showing the bottom of the bottle of FIG. 6 in a somewhat schematic manner.
【図１０】図６におけるＸ−Ｘ軸方向円周断面展開図で
ある。10 is a development view of a circumferential cross section in the XX axis direction in FIG.
Ｐ プリフォーム １ 口頸部 ２ 上方接続部 ３ 側壁部 ４ 閉塞底部 ５ 密封用開口端 ６ 蓋係合用ネジ部 ７ 支持リング ８ 側壁の上部 ９ 側壁の下部 １０ テーパ状接続部 １１ 外リブの頂部 １２ 側壁外周面 １３ 外リブ １４ 結晶化白化帯 １５ 底部結晶化用マスキングユニット １６ 熱遮断壁 １７ 結晶化白化帯形成用の開口した窓 Ｂ 耐熱乃至耐圧ボトル ２１ 筒状の胴部 ２２ 錐体状の肩部 ２３ サポートリング ２４ ノズル部 ２５ 口頸部 ２６ 底部 ２７ 外周部 ２８ 接地部 ２９ 底中心部 ３０ 湾曲部 ３１ 結晶化補強帯 ３２ 非白化域 P preform 1 mouth neck 2 upper connection part 3 side wall part 4 closed bottom part 5 sealing open end 6 screw part for lid engagement 7 support ring 8 upper part of side wall 9 lower part of side wall 10 tapered connection part 11 top part of outer rib 12 Side wall outer peripheral surface 13 Outer rib 14 Crystallized whitening zone 15 Bottom crystallization masking unit 16 Heat blocking wall 17 Opened window for forming crystallization whitening zone B Heat-resistant or pressure-resistant bottle 21 Cylindrical body 22 Conical shoulder Part 23 Support ring 24 Nozzle part 25 Mouth and neck part 26 Bottom part 27 Outer peripheral part 28 Ground contact part 29 Bottom center part 30 Curved part 31 Crystallization reinforcement zone 32 Non-whitening area
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29351293AJP2743799B2 (en) | 1993-11-24 | 1993-11-24 | Polyester bottle and preform used for its production |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29351293AJP2743799B2 (en) | 1993-11-24 | 1993-11-24 | Polyester bottle and preform used for its production |
| Publication Number | Publication Date |
|---|---|
| JPH07149336Atrue JPH07149336A (en) | 1995-06-13 |
| JP2743799B2 JP2743799B2 (en) | 1998-04-22 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29351293AExpired - Fee RelatedJP2743799B2 (en) | 1993-11-24 | 1993-11-24 | Polyester bottle and preform used for its production |
| Country | Link |
|---|---|
| JP (1) | JP2743799B2 (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11240527A (en)* | 1998-02-27 | 1999-09-07 | Kyoraku Co Ltd | Blow molded container |
| JP2003226319A (en)* | 2002-01-31 | 2003-08-12 | Yoshino Kogyosho Co Ltd | Thin bottle container made of synthetic resin |
| JP2016108018A (en)* | 2014-12-05 | 2016-06-20 | 大日本印刷株式会社 | Plastic container |
| CN110114276A (en)* | 2016-12-28 | 2019-08-09 | 三得利控股株式会社 | Resin container |
| IT202200014371A1 (en)* | 2022-07-07 | 2024-01-07 | Sipa Progettazione Automaz | REUSABLE PLASTIC BOTTLE |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5571245A (en)* | 1978-12-18 | 1980-05-29 | Yoshino Kogyosho Co Ltd | Innprocess product for making bottle of twooaxissextended synthetic resin |
| JPS60172636A (en)* | 1984-02-08 | 1985-09-06 | 株式会社吉野工業所 | Vessel made of polyester resin and molding method thereof |
| JPS61244738A (en)* | 1985-04-18 | 1986-10-31 | 東洋製罐株式会社 | Biaxial oriented molded vessel |
| JPS6311212A (en)* | 1986-07-03 | 1988-01-18 | Mitsui Constr Co Ltd | Hand cutter |
| JPH01153453A (en)* | 1987-12-10 | 1989-06-15 | Toyo Seikan Kaisha Ltd | Pressure-and heat-resisting container and production thereof |
| JPH01286817A (en)* | 1979-11-27 | 1989-11-17 | Continental Group Inc:The | Plastic vessel with internal rib-reinforced bottom and manufacture thereof |
| JPH0425296U (en)* | 1990-06-21 | 1992-02-28 | ||
| JPH04189739A (en)* | 1990-11-20 | 1992-07-08 | Yoshino Kogyosho Co Ltd | Biaxial stretch blow molded bottle |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5571245A (en)* | 1978-12-18 | 1980-05-29 | Yoshino Kogyosho Co Ltd | Innprocess product for making bottle of twooaxissextended synthetic resin |
| JPH01286817A (en)* | 1979-11-27 | 1989-11-17 | Continental Group Inc:The | Plastic vessel with internal rib-reinforced bottom and manufacture thereof |
| JPS60172636A (en)* | 1984-02-08 | 1985-09-06 | 株式会社吉野工業所 | Vessel made of polyester resin and molding method thereof |
| JPS61244738A (en)* | 1985-04-18 | 1986-10-31 | 東洋製罐株式会社 | Biaxial oriented molded vessel |
| JPS6311212A (en)* | 1986-07-03 | 1988-01-18 | Mitsui Constr Co Ltd | Hand cutter |
| JPH01153453A (en)* | 1987-12-10 | 1989-06-15 | Toyo Seikan Kaisha Ltd | Pressure-and heat-resisting container and production thereof |
| JPH0425296U (en)* | 1990-06-21 | 1992-02-28 | ||
| JPH04189739A (en)* | 1990-11-20 | 1992-07-08 | Yoshino Kogyosho Co Ltd | Biaxial stretch blow molded bottle |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11240527A (en)* | 1998-02-27 | 1999-09-07 | Kyoraku Co Ltd | Blow molded container |
| JP2003226319A (en)* | 2002-01-31 | 2003-08-12 | Yoshino Kogyosho Co Ltd | Thin bottle container made of synthetic resin |
| EP1471010A4 (en)* | 2002-01-31 | 2007-01-10 | Yoshino Kogyosho Co Ltd | Synthetic resin thin-walled bottle container |
| US7556164B2 (en) | 2002-01-31 | 2009-07-07 | Yoshino Kogyosho Co., Ltd. | Synthetic resin thin-walled bottle container with bottom heel |
| JP2016108018A (en)* | 2014-12-05 | 2016-06-20 | 大日本印刷株式会社 | Plastic container |
| CN110114276A (en)* | 2016-12-28 | 2019-08-09 | 三得利控股株式会社 | Resin container |
| IT202200014371A1 (en)* | 2022-07-07 | 2024-01-07 | Sipa Progettazione Automaz | REUSABLE PLASTIC BOTTLE |
| WO2024009183A3 (en)* | 2022-07-07 | 2024-03-07 | S.I.P.A. Societa' Industrializzazione Progettazione E Automazione S.P.A. | Reusable bottle made of plastic |
| Publication number | Publication date |
|---|---|
| JP2743799B2 (en) | 1998-04-22 |
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