The preparation method of diaphragm for applianceTechnical field
The present invention relates to orthodontic technology fields, more particularly to a kind of preparation method of the diaphragm for appliance.
Background technology
Invisible orthotic device due to it is beautiful, facilitate the advantages that it is more and more welcomed by the people.Correction patient is hidden by wearingShape appliance carries out orthodontic.Invisible orthotic device acts power to tooth（Corrective force）To achieve the effect that correction.It is stealthyAppliance is made using high-molecular diaphragm, and the mechanical property of high-molecular diaphragm is related to the stealthy mechanical property of facing.Therefore, rightIt is necessary that the mechanical property of high-molecular diaphragm, which carries out research,.
Invention content
Based on this, it is necessary to the problem of for the mechanical property for how improving diaphragm, provide a kind of film for applianceThe preparation method of piece.
A kind of preparation method of diaphragm for appliance, includes the following steps：
PETG particles are subjected to removal moisture drying, the PETG particles after being dried；
PETG particles after the drying are squeezed out in double screw extruder, screw rod melting temperature is 180 DEG C -270 DEG C, rotating speedIt it is 5-100 revs/min, residence time of the PETG particles in screw rod after the drying is 0.5-5 minutes；
The PETG particles after extrusion are rolled, diaphragm is obtained.
Include by the step of PETG particles progress removal moisture drying processing in one of the embodiments,：The PETG is putEnter dehumidifying heat pump and carry out removal moisture drying, the drying temperature of the dehumidifying heat pump is 80 DEG C -100 DEG C, and dew point is less than 40 degree, doesThe dry time is 3-7 hours.The die head temperature of the double screw extruder is 40 DEG C -80 DEG C in one of the embodiments,.
The PETG particles after extrusion are by three floating billowing pressures, three floating rollings in one of the embodiments,Respectively first floating rolling, the second floating rolling and the floating rolling of third；The temperature of described first floating rolling is 40 DEG C -80 DEG C；Described second is floatingThe temperature of the floating rolling of rolling is 38 DEG C -70 DEG C；The temperature of the floating rolling of the third is 35 DEG C -60 DEG C.
The temperature of the described first floating rolling, the second floating rolling are controlled by constant temperature water tank in one of the embodiments,Temperature and the temperature of the floating rolling of the third.
After the step of rolling by the PETG particles after extrusion in one of the embodiments, obtain diaphragm,It further include step：Protective film is enclosed on the surface of the diaphragm.
The protective film is PE films in one of the embodiments,.
The thickness of the protective film is 0.02 millimeter -0.1 millimeter in one of the embodiments,.
The diaphragm for enclosing the protective film is cut in one of the embodiments, the diaphragm is cutAt the rectangular sheet of predetermined size.
The rectangular sheet is put into punching machine in one of the embodiments, strikes out disk.
PETG particles are carried out removal moisture drying, after being dried by the preparation method of the above-mentioned diaphragm for appliancePETG, then the PETG particles after drying are squeezed out in double screw extruder, screw rod melting temperature is 180 DEG C -270 DEG C, rotating speedIt it is 5-100 revs/min, residence times of the PETG after drying in screw rod is 0.5-5 minutes, and PETG particles after extrusion carry outRolling, obtains diaphragm, which is rolled again by carrying out Screw Extrusion to PETG, obtains diaphragm, preparation process letterIt is single, in addition, by the control to Screw Extrusion condition, improve the mechanical property of diaphragm.
Description of the drawings
Fig. 1 is the flow diagram of the preparation method of the diaphragm for appliance of an embodiment.
Specific implementation mode
To make the above purposes, features and advantages of the invention more obvious and understandable, below in conjunction with the accompanying drawings to the present inventionSpecific embodiment be described in detail.
As shown in Figure 1, the preparation method of the diaphragm for appliance of an embodiment includes the following steps：
S110：PETG particles are subjected to removal moisture drying processing, the PETG particles after being dried.
Specifically, PETG particles（SK groups of South Korea, ECOZEN T90G）As masterbatch.PETG particles are put into materialBucket, dehumidifying heat pump（Shanghai Song Tian mechanical equipments Co., Ltd, model：ST-C150）PETG particles in automatic sucking charging basketInto equipment, the drying temperature of dehumidifying heat pump is 80 DEG C -100 DEG C, and dew point is less than 40 degree, and drying time is 3-7 hours.ToCan PETG be dehumidified and be dried, to prevent the moisture in PETG etc. from being had an impact to it.In other embodiments, also may be usedWith by PETG particles in vacuum drying oven 80 DEG C -100 DEG C 3-7 hours dry, the PETG particles after being dried.
S120：PETG particles after drying are squeezed out in double screw extruder.
Specifically, PETG particles after dry squeeze out after melt kneading stirs evenly in double screw extruder.Twin-screwThe condition of extrusion is：Screw rod melting temperature is 180 DEG C -270 DEG C, and rotating speed is 5-100 revs/min, and the PETG particles after drying existResidence time in screw rod is 0.5-5 minutes.By the PETG masterbatch after progress removal moisture drying in step S110 in twin-screw extrusionIt is squeezed out in machine.Wherein, the producer of used double screw extruder is the limited public affairs of Shijiazhuang Wei Shida twin-screw extrusion machine equipmentsDepartment, model TE-36.
The die head temperature of double screw extruder is 40 DEG C -80 DEG C in one of the embodiments,.To the PETG after dryingMasterbatch enters double screw extruder by blanking device, and PETG masterbatch is in molten condition, then is squeezed out from die head.PETG particles are doubleDuring Screw Extrusion, PETG is in molten condition, and the molecule of PETG moves at high temperature, then is carried out centainly by die headCooling, be conveniently molded into sheet material.In addition, screw rod melting temperature is different, the degree of molecular motion differs under PETG molten conditionsSample, so that the mechanical property of the PETG after extruded can be different.
It should be noted that the shape of the PETG masterbatch after twin-screw extrusion can be determined by the selection of die head.At thisIn embodiment, the PETG particles after twin-screw extrusion are with certain thickness PETG sheet materials.At this point, by die head to thisThe thickness of PETG has carried out first adjustment.
S130：PETG particles after extrusion are rolled, diaphragm is obtained.
Specifically, the PETG sheet materials squeezed out in step S130 are rolled by roller press.In one embodiment, squeezeFor the PETG particles after going out by three floating billowing pressures, three floating rollings are respectively that the first floating rolling, the second floating rolling and third are floatingRolling.The temperature of first floating rolling is 40 DEG C -80 DEG C, and the temperature of the second floating floating rolling of rolling is 38 DEG C -70 DEG C, and the temperature of the floating rolling of third is 35℃-60℃.Wherein, the first floating rolling floats downward rolling for rolling, and second floats rolling rolls to be floated in rolling, and the floating rolling of third is rolling floating rolling.By three floating billowing pressures, required diaphragm thickness is obtained, wherein floating rolling can adjust the thickness of diaphragm, is realized to diaphragm thicknessFurther accurate adjustment.Rolling is floated in rolling and rolls the spacing for floating downward rolling wherein it is possible to adjust, to adjust the thickness of diaphragm, andThe accurate thickness for adjusting diaphragm.It should be noted that the thickness of diaphragm can be determined according to actual needs, the thickness of diaphragmDegree can be 0.5 millimeter, 0.75 millimeter etc..
In one of the embodiments, after step s 130, further include step：Protection is enclosed on the surface of diaphragmFilm.By the setting of protective film, the surface tear etc. of diaphragm is avoided.In one embodiment, which is PE films.It needs to illustrate, which may be PVC film etc..Wherein, the thickness of protective film can be 0.02 millimeter -0.1 millimeter.In this implementationIn example, the thickness of protective film is 0.05 millimeter.Furthermore, it is necessary to which explanation, can enclose protection on a surface of diaphragmFilm can also enclose protective film on two opposite surfaces of diaphragm.
The diaphragm after protective film will be enclosed in one of the embodiments, to cut again, will enclose the film after protective filmThe rectangular sheet that piece is cut to predetermine sizes.Wherein, predetermined size herein and is not construed as limiting according to being determined needed for production.IntoOne step, in one embodiment, rectangular sheet is put into punching machine, and strike out disk.Specifically, the film of protective film will be enclosedPiece is cut into the rectangular sheet of specific dimensions, then tests.After the assay was approved, it then is carried out striking out disk.Wherein, circleThe diameter of piece can be 125mm.
PETG particles are carried out removal moisture drying, after being dried by the preparation method of the above-mentioned diaphragm for appliancePETG, then the PETG particles after drying are squeezed out in double screw extruder, screw rod melting temperature is 180 DEG C -270 DEG C, rotating speedIt it is 5-100 revs/min, residence times of the PETG after drying in screw rod is 0.5-5 minutes, and PETG particles after extrusion carry outRolling, obtains diaphragm, which is rolled again by carrying out Screw Extrusion to PETG, obtains diaphragm, preparation process letterIt is single, in addition, by the control to Screw Extrusion condition, improve the mechanical property of diaphragm.
Below by way of specific embodiment, the invention will be further elaborated.
Embodiment 1
(1) PETG is dried：By PETG in dehumidifying heat pump 100 DEG C of dryings 5 hours, the PETG after being dried；
(2) twin-screw extrusion：PETG after drying is squeezed out in double screw extruder, the condition of twin-screw extrusion is：Screw rodMelting temperature is 180 DEG C, and rotating speed is 100 revs/min, and residence times of the PETG in screw rod after drying is 2 minutes；Twin-screwThe die head temperature of extruder is 60 DEG C；
(4) it rolls：Sheet material after extrusion is rolled by roller press, the condition rolled is：The temperature of rolling is floated downward in rollingDegree is 70 DEG C；The temperature that rolling is floated in rolling is 50 DEG C；The temperature of rolling floating rolling is 40 DEG C；The thickness of diaphragm is 0.75 millimeter.
By diaphragm made from embodiment 1 by universal testing machine tested for flexural modulus be 1050MPA；It is hard using RockwellThe hardness that degree testing machine measures the diaphragm is 70R（Rockwell hardness）.
Embodiment 2
Embodiment 2 is identical as the preparation method of embodiment 1, and the condition difference lies in twin-screw extrusion is：Screw rod melting temperature is200 DEG C, rotating speed is 100 revs/min, and residence times of the PETG in screw rod after drying is 2 minutes；The mould of double screw extruderHead temperature is 60 DEG C.
By diaphragm made from embodiment 2 by universal testing machine tested for flexural modulus be 1410MPA；Using HB-The hardness that 3000 type ball hardness testing machines measure the diaphragm is 91R.
Embodiment 3
Embodiment 3 is identical as the preparation method of embodiment 1, and the condition difference lies in twin-screw extrusion is：Screw rod melting temperature is210 DEG C, rotating speed is 100 revs/min, and residence times of the PETG in screw rod after drying is 2 minutes；The mould of double screw extruderHead temperature is 60 DEG C.
By diaphragm made from embodiment 3 by universal testing machine tested for flexural modulus be 1930MPA；Using HB-The hardness that 3000 type ball hardness testing machines measure the diaphragm is 107R.
Embodiment 4
Embodiment 4 is identical as the preparation method of embodiment 1, and the condition difference lies in twin-screw extrusion is：Screw rod melting temperature is230 DEG C, rotating speed is 100 revs/min, and residence times of the PETG in screw rod after drying is 2 minutes；The mould of double screw extruderHead temperature is 60 DEG C.
By diaphragm made from embodiment 4 by universal testing machine tested for flexural modulus be 2040MPA；Using HB-The hardness that 3000 type ball hardness testing machines measure the diaphragm is 115R.
Embodiment 5
Embodiment 5 is identical as the preparation method of embodiment 1, and the condition difference lies in twin-screw extrusion is：Screw rod melting temperature is250 DEG C, rotating speed is 100 revs/min, and residence times of the PETG in screw rod after drying is 2 minutes；The mould of double screw extruderHead temperature is 60 DEG C.
By diaphragm made from embodiment 5 by universal testing machine tested for flexural modulus be 1820MPA；Using HB-The hardness that 3000 type ball hardness testing machines measure the diaphragm is 110R.
Embodiment 6
Embodiment 6 is identical as the preparation method of embodiment 1, and the condition difference lies in twin-screw extrusion is：Screw rod melting temperature is270 DEG C, rotating speed is 100 revs/min, and residence times of the PETG in screw rod after drying is 2 minutes；The mould of double screw extruderHead temperature is 60 DEG C.
By diaphragm made from embodiment 1 by universal testing machine tested for flexural modulus be 1410MPA；Using HB-The hardness that 3000 type ball hardness testing machines measure the diaphragm is 109R.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned realityIt applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not depositedIn contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneouslyIt cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the artIt says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present inventionRange.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.