CN113646155A - Method for providing a base product and mandrel coated with an elongated body - Google Patents

Abstract

The present invention relates to a method for providing a base product made of at least polytetrafluoroethylene (hereinafter referred to as "PTFE"), and a mandrel covered with an elongated body of the base product, and an object of the present invention is to provide a base product capable of reducing the number of production steps of the product. The problem is solved by a method for providing a base product and a mandrel coated with the base product, wherein the base product is an elongated body formed by winding at least one film into a spiral shape without a gap, at least one film of the at least one film is made of at least polytetrafluoroethylene, the thickness of the elongated body is 5 [ mu ] m or more and 75 [ mu ] m or less, and the elongated body is provided in contact with the mandrel.

Description

Method for providing a base product and mandrel coated with an elongated body

Technical Field

The present invention relates to a method for providing a base product made of polytetrafluoroethylene (hereinafter referred to as "PTFE"), and a mandrel (mandrel) coated with an elongated body of the base product.

Background

There are products in which a fluororesin layer is provided on an inner layer of a pipe, such as a pipe for transporting a fluid that is required to be used for medical purposes and chemical resistance. Some of these products are produced by using a long body made of a fluororesin provided as a base product and laminating various kinds of outer layer materials such as a resin and a reinforcing layer on the long body.

For example, when a fluororesin elongate body is used for a catheter (catheter), an elastomer layer for imparting flatness (flatness) and workability, and a reinforcing layer including a metal wire may be laminated in this order on the outer periphery of the elongate body to form a product. In some pharmaceutical applications, a silicone elastomer is laminated on a long body made of a fluororesin, and an elastomer layer in which a woven or knitted fabric made of polyester fibers is embedded is laminated on the elastomer to form a product. In addition, when used for fuel transportation applications, an elastomer is laminated on the outer periphery of the elongated body, and a woven or knitted fabric of a reinforcing material having high heat resistance is added to the outer periphery of the elastomer to form a product.

In addition, the finished product using the base product is sometimes required to be thin, and in this case, the base product constituting a part thereof is also required to be thin. In addition, when flexibility and flexibility of the product are required, the fluororesin is hard, and therefore, the base product may need to be made thin accordingly.

Disclosure of Invention

Problems to be solved by the invention

Conventionally, for example, when a certain manufacturer uses an elongated body provided as a base product, the product is sometimes manufactured through the following steps: inserting a mandrel into the elongated body; heating the mandrel to extend the long body in the longitudinal direction and to bring the mandrel into uniform contact with the long body; forming a product by laminating various layers on the elongated body in a state where the elongated body is brought into contact with the surface of the mandrel; and a step of extending the mandrel in the longitudinal direction to reduce the diameter of the mandrel, and extracting the mandrel from the product. As described above, in the conventional long body as a base product, a step of bringing the base product into contact with the mandrel is required in the product manufacturing step.

Means for solving the problems

The object is achieved by a method for providing a base product which is an elongated body formed by winding at least one film in a spiral shape without a gap, wherein at least one film of the at least one film is made of at least polytetrafluoroethylene, the elongated body has an average thickness of 5 μm or more and 75 μm or less, and the elongated body is provided in contact with a mandrel.

The mandrel coated with an elongated body includes a mandrel and an elongated body, the elongated body is formed by winding at least one film in a spiral shape around an outer periphery of the mandrel and forming the at least one film without a gap, at least one film of the at least one film is made of at least polytetrafluoroethylene, and an average thickness of the elongated body is 5 μm or more and 75 μm or less.

In the above-mentioned elongated body, it is preferable that the strain% is represented by the horizontal axis and the stress N/mm is represented by the stress N/mm using the measurement value obtained by the tensile test according to JIS K7127-1999²In the stress-strain curve of the long body on the vertical axis, when the stress-strain curve is regarded as a single peak, the full width at half maximum of the peak is in the range of 10% to 150%.

In the above-mentioned elongated body, it is preferable that the tensile strength at 20% displacement of the elongated body obtained by the tensile test according to JIS K7127-1999 is 100N/mm²The above.

In the above-described elongated body, preferably, one or more films are spirally wound in a right-hand roll, and one or more films are spirally wound in a left-hand roll.

The thickness of the film is preferably 2 μm or more and 25 μm or less, and the film may be formed by laminating at least a polytetrafluoroethylene film and a thermoplastic fluororesin film.

The long body provided as the base product is more preferably provided in a state of being in contact with a mandrel having an outer diameter of 0.05mm to 10 mm.

The above problems are solved by a method for providing a base product which is a cylindrical elongated body made of at least polytetrafluoroethylene, the elongated body having an average thickness of 5 to 75 μm, and the base product is used in a containerMeasured values obtained by tensile test according to JIS K7127-1999, strain% is plotted as abscissa, and stress N/mm²In the stress-strain curve of the long body on the vertical axis, when the stress-strain curve is regarded as a single peak, the full width at half maximum of the peak is in the range of 10% to 150%, and the long body is provided in a state of being in contact with the mandrel.

Effects of the invention

According to the present invention, the above problems are solved by a hitherto unknown method of providing a base product. That is, the step of bringing the long body provided as the base product into contact with the mandrel is not required, and the number of steps can be greatly reduced in the manufacturing step.

Drawings

Fig. 1 is a view showing an embodiment when a base product of the present invention is provided.

Fig. 2 is a sectional view of an example of the elongated body of the present invention.

Fig. 3 is a diagram illustrating an example of a film used for the elongated body of the present invention.

Fig. 4 is a diagram illustrating a winding structure of a film as an example of the elongated body of the present invention.

Fig. 5 is a diagram illustrating a structure of an example of the elongated body of the present invention.

Fig. 6 is a cross-sectional view of an example of the elongated body of the present invention.

Figure 7 is a schematic of the stress-strain curve of the elongate body of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail. The embodiments described below do not limit the invention according to the claims, and even the features described in the embodiments are not necessarily essential for the establishment of the invention.

Fig. 1 is a view showing an embodiment when a base product of the present invention is provided. The long body as the base product of the present invention is provided to the manufacturer in a state where the inner circumferential surface of thelong body 120 is in contact with the outer circumference of themandrel 110. Theelongated body 120 is cylindrical and made of a resin containing polytetrafluoroethylene, and the average thickness of theelongated body 120 is generally required to be thin. The thickness of the elongated body of the present invention is preferably 5 μm or more and 75 μm or less, more preferably 5 μm or more and 50 μm or less, and still more preferably 5 μm or more and 40 μm or less. Further, theelongated body 120 is preferably formed by winding at least one film on themandrel 110 in a spiral shape without a gap therebetween. Here, "formed without a gap" means a state in which the outer peripheral surface of themandrel 110 is completely covered with one or more films.

As another alternative to forming the longshaped body 120 on themandrel 110 without a gap, it may be formed without a gap by a so-called cigarette wrapping film (or a single seamless film).

Fig. 2 is a view showing a part of a cross section along the longitudinal direction of an example of the long form of the present invention in which a film is wound in a spiral shape. Fig. 2 shows an example in which theelongated body 120 is formed of at least two layers. Fig. 2 a) is a view of the case where theelongated body 120 is formed of two layers, and thefirst film 121a is wound spirally on the outer circumference of themandrel 110 with a space therebetween. Outside thefirst layer 121a, thesecond layer 122a is spirally wound so as to fill the space between thefirst layer 121 a. Thereby, the outer peripheral surface of themandrel 110 is completely covered with the two-layer film. Fig. 2 b) is a diagram of another example when theelongated body 120 is formed of two layers. Thefirst film 121b is spirally wound on themandrel 110 without a gap, and the second film 122b is spirally wound outside thefirst film 121b without a gap. Fig. 2 c) is a diagram showing an example of the case where theelongated body 120 is formed of three layers. Thefirst film 121c is spirally wound without a gap on the outer periphery of themandrel 110, the second film 122c is spirally wound with a gap on the outer side of thefirst film 121c, and the third film 123c is spirally wound without a gap on the outer side of the second film 122 c. The long body of the present invention may be formed of, for example, four or more layers.

As the mandrel used in the present invention, a tube made of a metal such as SUS, copper, silver, brass, aluminum, or nickel titanium, a tube made of a resin such as PTFE or PEEK, a wire made of a metal such as SUS, copper, silver, aluminum, or nickel titanium, a wire rod made of a metal such as silver or nickel plated on the wire, or a resin wire such as PTFE or Polyetheretherketone (PEEK) can be used. The cross-sectional shape of the mandrel is usually circular (including substantially circular), but may be a quadrilateral shape, a polygonal shape, or the like, or may be a shape in which the shape is locally changed, as necessary. Since the elongated body contacts the outer peripheral surface of the mandrel, the surface of the mandrel is preferably smooth.

In the present invention, when a mandrel having a circular cross-sectional shape is used, a mandrel having an outer diameter of 0.05mm or more and 10mm or less is preferably used. Among them, a mandrel of 0.075mm to 8mm is preferable, and a mandrel of 0.1mm to 5mm is more preferable. The tensile elongation at break of the mandrel is preferably 5% or more. When the tensile elongation at break is 5% or more, the mandrel can be extended in the longitudinal direction to reduce the outer diameter thereof at a stage where the mandrel is not required in the production process, and the finished product using the base product can be more easily pulled out from the mandrel. The tensile breaking strength is preferably 75MPa to 600 MPa.

The membrane made of polytetrafluoroethylene used for the elongate body of the invention is preferably made of PTFE of a filled structure. In the case of using PTFE of a filled structure, airtightness and strength of the finished product using the elongated body can be obtained. The membrane made of PTFE having a filled structure can be produced, for example, as follows. Fine powder (fine powder) of PTFE resin and an auxiliary agent (lubricant such as solvent naphtha and white oil) are mixed, and the compressed preform is put into an extruder and molded into a film shape, and dried. After drying, the auxiliary agent in the molded article molded into a film is volatilized, and an unfired PTFE film having fine pores in the film can be obtained. The unfired PTFE film is heated to a temperature not lower than the melting point and fired, and pores in the film disappear, resulting in a filled PTFE film. At this time, the film may be further compressed by the pressure roller. Further, the above-mentioned unfired PTFE film may be heated at a temperature not higher than the melting point thereof and stretched uniaxially or biaxially to produce a porous PTFE film, and then the film may be pressurized to obtain a film having a filled structure. The film after pressing may be used by firing. The fabricated film is generally cut (slit) to the width used. The porous PTFE film may be formed by winding a PTFE film around the outer periphery of a mandrel in a spiral shape, and then passing the film through an annular die (die) to convert the film from a porous structure to a solid structure.

The film for the elongated body of the present invention may also contain a filler or other resin as necessary. Examples of the filler include: examples of the resin filler include a resin filler and a metal oxide such as carbon and alumina, and other resins include thermoplastic fluororesins. They may be used singly or in combination.

Fig. 3 is a diagram illustrating an example of a film used for the elongated body of the present invention, and shows an example in which thesecond layer 130a of the elongated body is formed by a single PTFE film 131a, and thefirst layer 130b is formed by a single PTFE film 132a and a singlethermoplastic fluororesin film 132b being laminated. The film used for the elongated body of the present invention is not limited to a film obtained by laminating two resin films as in 130b, and a film obtained by laminating three or more resin films may be used. The laminated resin films may or may not be bonded. In the present invention, the term "one film" also includes a film obtained by laminating two or more resin films and winding them at the same angle on a mandrel (in some cases, on a certain layer of an elongated body) as in thesecond layer 130b of fig. 3.

The resin used for the thermoplastic fluororesin resin film is preferably a resin having a melting point lower than the crystal melting point of PTFE, such as tetrafluoroethylene-hexafluoropropylene copolymer (FEP) or tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA). When one film composed of a PTFE film and a thermoplastic fluororesin film is used, the ratio of the thicknesses thereof (PTFE resin film/thermoplastic fluororesin resin film) is preferably in the range of 10/1 to 1/1. The long body of the present invention preferably contains PTFE as a main component. The term "main component" as used herein means a component occupying at least half of the whole volume ratio.

The film used for the elongated body of the present invention has a thickness of preferably 2 μm or more and 25 μm or less, more preferably 3 μm or more and 25 μm or less, and still more preferably 3 μm or more and 20 μm or less. As the thickness of the film becomes thinner, the difference in height of the winding end (coil mesh) when the film is wound around the mandrel becomes smaller, and the influence of the winding end on the inner surface and the outer surface of the elongated body becomes smaller, but if the thickness is too thin, the film may be damaged or wrinkled when the film is coated on the mandrel.

The width of the film used for the elongated body of the present invention can be appropriately determined depending on the inner diameter of the elongated body and the desired thickness of the elongated body, the winding angle of the film, and the like. Fig. 4 is a diagram for explaining parameters related to the winding structure of the film of the elongated body of the present invention. Assuming that the outer diameter of the mandrel 110 (the inner diameter of the elongated body) is D, the winding angle of the film is α, the distance to be advanced when thefilm 130 is wound once is P, and the overlapping amount of thewound films 130 is b, the width W of thefilm 130 is obtained by the following equation. Here, the winding angle α of the film is an angle between the central axis a of the elongated body and the center line B of the width of the film, and is an angle greater than 0 degree and less than 90 degrees.

P＝πDcosα

W＝Psinα+b

In the present invention, the number of turns (number of windings) of the film is determined by the following equation. The width of thefilms 130 is denoted by W, and the overlapping amount of thefilms 130 is denoted by b.

Number of turns (number of windings) ═ 1+ (b/W)

In the case where thefilms 130 are wound at intervals, the amount of overlap of thefilms 130 with each other is expressed as a negative amount, and the number of turns of the films becomes a number smaller than 1.

Fig. 5 is a diagram illustrating a winding structure of a film as an example of the elongated body of the present invention. In the example of fig. 5, three layers are provided, each of which is formed of a single film. Each film is wound in any of a right-hand winding (Z-winding) and a left-hand winding (S-winding) in the spiral direction. In the example of fig. 5, thefirst layer 121 of theelongated body 120 is formed by winding in a right-hand direction. Thesecond layer 122 is wound in a direction different from the direction in which the film is wound, that is, in a left-hand roll, from thefirst layer 121. Thethird layer 123 is wound in a right-hand direction in the same direction as the first layer. In the long body of the present invention, preferably, one or more films are wound in a spiral shape in a rightward direction, and one or more films are wound in a spiral shape in a leftward direction opposite to the rightward direction.

The layers of the elongated body of the present invention are preferably wound at an angle at which the film is wound at 3 to 30 degrees, more preferably at an angle of 3 to 20 degrees. The winding angles of all the layers constituting the elongated body do not have to be made uniform, and the layers may be wound at different winding angles. The films of the respective layers of the elongated body are preferably wound so that the end portions of the respective films overlap, but the elongated body may be formed in a state in which the outer periphery of the mandrel is completely covered by laminating layers wound with a gap therebetween. Fig. 6 is an example of the first film of the elongated body being wound at 1.5 turns (i.e., the number of turns by which half of the width of the film coincides with the adjacent film).

The elongate body on the mandrel is preferably heated to a temperature above 340 ℃. By heating in this manner, the overlapped portions of the wound films or the adjacent layers are easily welded and integrated. In addition, by heating, it is easy to firmly contact the mandrel.

The elongated body of the present invention has a stress N/mm on the horizontal axis representing the% strain using the measurement value obtained by the tensile test according to JIS K7127-1999²In the stress-strain curve of the long body on the vertical axis, the full width at half maximum of the peak when the stress-strain curve is regarded as a single peak is preferably in the range of 10% to 200%, more preferably in the range of 10% to 150%, and still more preferably in the range of 10% to 100%. By setting in this manner, an elongated body having a balanced strength and bendability is obtained. Further, even a thin, long body can achieve both bendability and strength.

In the long body of the present invention, the tensile strength at 20% strain of the long body obtained by the tensile test according to JIS K7127-1999 is preferably 100N/mm²The above.

In the present invention, the long form of the present invention is further processed and provided to the manufacturer as long as it is not a finished product but is in the category of a base product. In this case, the tensile test of the long body of the present invention is performed in a state of the long body alone before the long body is processed.

The conventional base product can be supplied in accordance with the length of the finished product, and such a supply method is possible, but the base product supply method of the present invention may be used to supply an elongated body by winding the elongated body around a reel (reel) or bundling the elongated body into a bundle in a length corresponding to a plurality of finished products.

The method for producing the elongated body of the present invention will be described in further detail with reference to the following examples. The following examples illustrate the present invention, and the present invention is not limited to the following examples.

Examples

< measurement of size of Long form >

The mandrel coated with the elongated body was cut to a length of about 1m, and only the mandrel was extended and pulled out to measure the dimension of the elongated body. The inner diameter, the outer diameter, and the wall thickness are measured by a microscope in a cross section perpendicular to the longitudinal direction of the elongated body, or the inner diameter is measured by a pin gauge (pin gauge) and the outer diameter is measured by a dial gauge (dial gauge) with the pin gauge inserted. In the case of using a microscope, measurement is performed in four or more directions so that measurement can be performed as uniformly as possible from each direction within the same section, and an arithmetic average value is taken. When a pin gauge and a dial gauge are used, the measurement is performed from four directions as equally as possible, and an arithmetic average is taken. It is preferable to measure the cross-section at as many positions in the same sample as possible and to take the arithmetic mean. When the inner diameter of the elongated body is large, the elongated body may be cut in the longitudinal direction and the thickness may be measured using a dial gauge.

The dimension of the elongated body is preferably measured at a position corresponding to the elongated body around the center in the longitudinal direction of the finished product. For example, it is conceivable to measure the dimension in the range of 25cm in front and rear with the center of the dimension measurement range being defined as a position corresponding to the elongated body around the center of the finished product in the longitudinal direction, and take the arithmetic average of the measured dimensions.

< tensile test >

The tensile test of the long article was carried out in accordance with JIS K7127-1999. Wherein, the test piece is a long body which is cut into a length of more than 8-10 cm. The test piece is preferably arranged such that a portion of the elongated body corresponding to the center of the finished product in the longitudinal direction is positioned at the center of the chuck (chuck). The test piece was set on the chucks of the tensile testing machine, and the distance between the chucks was used as the distance between the standard lines, and the tensile test was performed. The tensile testing machine was carried out at an initial inter-chuck distance of 50mm and a testing speed of 200mm/min under an environment of 23. + -. 2 ℃ using Autograph AGS-1 kNX manufactured by Shimadzu corporation.

The obtained measurement values have the strain expressed in% as the horizontal axis and the stress in N/mm²The unit of (a) represents the stress-strain curve produced on the vertical axis. Here, the strain is a value obtained by dividing an increase in the gauge line-to-line distance during stretching by the initial inter-chuck distance, and the stress is a value obtained by dividing the stretching force by the cross-sectional area of the elongated body before stretching between chucks (generally, equal to the cross-sectional area of the end of the elongated body before stretching). Regarding the stress-strain curve as a single peak, the width of the peak at a stress value half the maximum value of the stress of the single peak (difference between two strain values of the peak) is taken as the full width at half maximum of the peak in the stress-strain curve of the sample. Fig. 7 shows a schematic diagram of the stress-strain curve of the inventive long body and the full width at half maximum (FWHM) at this time. When the stress-strain curve of fig. 7 is regarded as a single peak, the strain value is ∈ when the stress value 1/2 σ max, which is half the maximum value σ max of the peak stress, is the maximum value σ max₁And ε₂. The full width at half maximum of the peak is determined by the following equation.

Full width at half maximum (%) -. epsilon₂－ε₁

In the tensile test, the tensile stress at 20% strain was defined as 20% strain tensile strength. The 20% strain tensile strength is preferably 100N/mm²The above.

Example 1

Procedure of basic product manufacturer

As a film, a PTFE film (thickness: 7 μm) was prepared. As a mandrel, a stainless steel wire having an outer diameter of 0.45mm was prepared. The PTFE film was spirally wound with 1.5 turns as a first layer in a right-hand direction and spirally wound with 1.3 turns as a second layer in a left-hand direction on the outer periphery of the mandrel by using a wrapping machine (wrapper), and laminated. The mandrel on which the film was laminated was passed through an oven heated to 370 ℃, then air-cooled, and wound on a reel. The properties of the resulting elongated bodies are summarized in table 1.

Procedure of the product manufacturer

The mandrel coated with the long body received from the base product manufacturer was fed from a reel to an extruder, and the polyamide elastomer was extruded to a thickness of 0.25mm on the outer periphery thereof and cut into a length of 2m by an In-line automatic Cutter. After cutting, only the mandrel was extended and pulled out to obtain a finished product in which a polyamide elastomer was laminated.

Example 2

Procedure of basic product manufacturer

As a film, a PTFE film (thickness: 6 μm) was prepared. As a mandrel, a copper wire having an outer diameter of 0.19mm was prepared. The PTFE film was spirally wound around the outer periphery of the mandrel as a first layer by winding it rightward, and was laminated on the first layer by winding it spirally around the first layer for 1.4 turns as a second layer by winding it leftward. The mandrel on which the film was laminated was passed through an oven heated to 380 ℃, then air-cooled, and wound on a reel. The properties of the resulting elongated bodies are summarized in table 1.

Procedure of the product manufacturer

The mandrel coated with the long body received from the base product manufacturer was fed from a reel to an extruder, and the polyamide elastomer was extruded to a thickness of 0.20mm on the outer periphery thereof and cut into a length of 2m by an In-line automatic Cutter. After cutting, only the mandrel was extended and pulled out to obtain a finished product in which a polyamide elastomer was laminated.

Example 3

Procedure of basic product manufacturer

As a film, a PTFE film (thickness: 7 μm) was prepared. Further, a film (laminated film) in which a PTFE film (thickness 7 μm) and a PFA film (thickness 8 μm) were laminated was prepared. As a mandrel, a stainless steel pipe having an outer diameter of 1.51mm was prepared. The PTFE film was spirally wound around the outer periphery of the mandrel for 1.5 turns as a first layer, and the laminated film was spirally wound around the first layer for 1.9 turns as a second layer. The mandrel on which the film was laminated was passed through an oven heated to 380 ℃, then air-cooled, and wound on a reel. The properties of the resulting elongated bodies are summarized in table 1.

Procedure of the product manufacturer

The mandrel coated with the long body received from the base product manufacturer was fed from a reel to an extruder, and the polyamide elastomer was extruded to a thickness of 0.5mm on the outer periphery thereof and cut into a length of 2m by an In-line automatic Cutter. After cutting, only the mandrel was extended and pulled out to obtain a finished product in which a polyamide elastomer was laminated.

Example 4

Procedure of basic product manufacturer

A film (laminated film) was prepared in which a PTFE film (thickness: 6 μm) and a PFA film (thickness: 2 μm) were laminated. As a mandrel, a PTFE monofilament having an outer diameter of 1.51mm was prepared. Using a winding machine, the PTFE side of the laminated film was spirally wound with 1.5 turns toward the mandrel as a first layer toward the left side, and the laminated film was spirally wound with 1.5 turns as a second layer toward the right side on the first layer, thereby laminating the laminated film. The mandrel on which the film was laminated was passed through an oven heated to 370 ℃, then air-cooled, and wound on a reel. The properties of the resulting elongated bodies are summarized in table 1.

Procedure of the product manufacturer

The elastomer received from the base article manufacturer was extruded to a thickness of 0.5mm and cut to a length of 2m using an In-line Automated Cutter. After cutting, the mandrel was pulled out by merely stretching the mandrel to obtain a finished product in which a polyurethane elastomer was laminated.

Example 5

Procedure of basic product manufacturer

As a film, a PTFE film (thickness: 6 μm) was prepared. Further, a film (laminated film) in which a PTFE film (thickness 6 μm) and a PFA film (thickness 2 μm) were laminated was prepared. As a mandrel, a stainless steel tube having an outer diameter of 1.49mm was prepared. Using a winding machine, a PTFE film was spirally wound around the outer periphery of a mandrel for 1.3 turns as a first layer, a laminated film was spirally wound around the first layer for 1.2 turns as a second layer, and the laminated film was spirally wound around the second layer for 1.0 turn as a third layer. The mandrel on which the film was laminated was passed through an oven heated to 390 ℃, then air-cooled, and wound on a reel. The properties of the resulting elongated bodies are summarized in table 1.

Procedure of the product manufacturer

The mandrel coated with the long body received from the base product manufacturer was fed from a reel to an extruder, and the polyurethane elastomer was extruded to a thickness of 0.5mm on the outer periphery thereof and cut into a length of 2m by an In-line automatic Cutter. After cutting, the mandrel was pulled out by merely stretching the mandrel to obtain a finished product in which a polyurethane elastomer was laminated.

Example 6

Procedure of basic product manufacturer

As a film, a PTFE film (thickness: 6 μm) was prepared. Further, a film (laminated film) in which a PTFE film (thickness 7 μm) and a PFA film (thickness 8 μm) were laminated was prepared. As a mandrel, a stainless steel tube having an outer diameter of 1.49mm was prepared. Using a winding machine, a PTFE film was spirally wound around the outer periphery of the mandrel for 1.3 turns as a first layer, a laminated film was spirally wound around the first layer for 1.9 turns as a second layer, and the laminated film was spirally wound around the second layer for 1.9 turns as a third layer. The mandrel on which the film was laminated was passed through an oven heated to 370 ℃, then air-cooled, and wound on a reel. The properties of the resulting elongated bodies are summarized in table 1.

Procedure of the product manufacturer

The mandrel coated with the long body received from the base product manufacturer was fed from a reel to an extruder, and the polyolefin elastomer was extruded to a thickness of 0.5mm on the outer periphery thereof and cut into a length of 2m by an In-line automatic Cutter. After cutting, the mandrel was pulled out by merely stretching the mandrel to obtain a finished product laminated with a polyolefin elastomer.

Example 7

Procedure of basic product manufacturer

A film (laminated film) was prepared in which a PTFE film (thickness: 8 μm) and a PFA film (thickness: 7 μm) were laminated. As a mandrel, an aluminum wire having an outer diameter of 1.49mm was prepared. The laminated film was spirally wound with 1.3 turns as a first layer on the outer periphery of the mandrel, and was spirally wound with 1.3 turns as a second layer on the first layer, and was laminated with the laminated film wound with a left turn as a second layer. The mandrel on which the film was laminated was passed through an oven heated to 380 ℃, then air-cooled, and wound on a reel. The properties of the resulting elongated bodies are summarized in table 1.

Procedure of the product manufacturer

The mandrel coated with the long body received from the base product manufacturer was fed from a reel to an extruder, and the polyolefin elastomer was extruded to a thickness of 0.5mm on the outer periphery thereof and cut into a length of 2m by an In-line automatic Cutter. After cutting, the mandrel was pulled out by merely stretching the mandrel to obtain a finished product laminated with a polyolefin elastomer.

Example 8

Procedure of basic product manufacturer

As a mandrel, a stainless steel wire having an outer diameter of 1.01mm was prepared. To a container, 18 parts by mass of an auxiliary agent was added and mixed with 100 parts by mass of the PTFE fine powder, and the mixture was put into a preforming machine to produce a preform. The preform is put into an extrusion molding machine, extruded into a seamless film shape by a cylindrical extrusion die, and stretched while being coated on a mandrel which passes through the inside of the extrusion die to form an elongated body. The mandrel coated with the elongated body was dried in a drying furnace set at 150 ℃, passed through a firing furnace set at 430 ℃, then air-cooled, and wound on a reel. The properties of the resulting elongated bodies are summarized in table 1.

Procedure of the product manufacturer

The mandrel coated with the long body received from the base product manufacturer was fed from a reel to an extruder, and the polyamide elastomer was extruded to a thickness of 0.35mm on the outer periphery thereof and cut into a length of 2m by an In-line automatic Cutter. After cutting, only the mandrel was extended and pulled out to obtain a finished product in which a polyamide elastomer was laminated.

In the above embodiment, the base product manufacturer and the finished product manufacturer may be different enterprises, but they may be persons participating in different manufacturing processes within the same enterprise.

Furthermore, it is also possible to go from the basic product manufacturer to the next basic product manufacturer, not from the basic product manufacturer to the finished product manufacturer.

Comparative example 1

Procedure of basic product manufacturer

The mixture was put into a preforming machine to prepare a preform, with 15 parts by weight of an auxiliary added to 100 parts by weight of the PTFE fine powder. The preform was put into an extrusion molding machine and extruded at a ram speed of 3mm/min to be molded into a cylindrical shape. The molded PTFE was dried, heated in an oven at 430 ℃ and then fired and cut to give a PTFE liner (liner) having a wall thickness of 0.025mm and a length of 2 m.

Procedure of the product manufacturer

As a mandrel, a stainless steel tube having an outer diameter of 1.35mm was prepared. A mandrel having a length of 2.2m was inserted through the interior of each PTFE liner received from the base article manufacturer. One end of the PTFE liner was fixed to the mandrel, and the other end was suspended in a thermostatic bath at 200 ℃ by fixing a weight (weight), and the PTFE liner was extended in the longitudinal direction by the load of the weight to reduce the diameter. The PTFE liner was obtained in a state where the inner surface of the PTFE liner was in contact with the surface of the mandrel.

Subsequently, one of the mandrels coated with the PTFE liner was taken out one by one, and a polyamide elastomer was applied to the surface thereof so that the thickness of the mandrel became 0.5mm, thereby crosslinking the polyamide elastomer. Then, only the mandrel was extended, and the mandrel was pulled out to obtain a finished product in which a polyamide elastomer was laminated.

However, in the step of stretching the PTFE liner in the longitudinal direction by heating, all the PTFE liners are stretched under the same conditions, but some of the PTFE liners are stretched excessively in the longitudinal direction, resulting in uneven wall thickness of the PTFE liners.

The elongated bodies produced in the procedures of the base product manufacturers of the examples and comparative examples were subjected to a tensile test in accordance with JIS K7127-1999. The tensile test was carried out under conditions of an inter-chuck distance of 50mm and a test speed of 200 mm/min. From the obtained measurement values, the full width at half maximum and 20% strain tensile strength of the peak in the stress-strain curve of the sample were confirmed. The results are shown in Table 1.

[ Table 1]

In the long body provided as the base product in the providing method of the present invention, the finished product manufacturer does not need to perform a step of coating the mandrel, and the steps of the finished product manufacturer can be significantly reduced. In the comparative example which is the conventional supply method, since a step of coating the mandrel with the elongated body is required, as a result, the working time is greatly wasted as compared with the example which is the supply method of the present invention. In addition, in the comparative example which is a conventional supply method, a plurality of finished products need to be manufactured separately.

Industrial applicability

The base product of the present invention can be suitably used in a wide range of fields such as an inner layer material of a transport pipe for a fluid, which particularly requires chemical resistance, and medical applications such as a catheter. The base product manufacturer who provides and operates the present invention can greatly reduce the man-hours in its manufacturing process.

Description of the reference numerals

110: a mandrel; 120: a long body; 121: a first layer; 122: a second layer; 123: a third layer; 130: and (3) a membrane.

Claims (15)

1. A method for providing a base product, characterized in that,

the base article is an elongated body of at least one film wound in a spiral shape and formed without a gap by the at least one film,

at least one of the at least one membrane is comprised of at least polytetrafluoroethylene,

the average thickness of the long body is more than 5 μm and less than 75 μm,

the elongated body is provided in a state of being in contact with the mandrel.

2. The method of providing a base article according to claim 1,

using the measured value obtained by the tensile test according to JIS K7127-1999, the stress N/mm is represented by the horizontal axis in% strain²In the stress-strain curve of the elongated body taken as the vertical axis,

when the stress-strain curve is regarded as a single peak, the full width at half maximum of the peak is in the range of 10% to 150%.

3. The method for providing a base product according to claim 1 or 2,

the tensile strength at 20% strain of the long body obtained by a tensile test according to JIS K7127-1999 is 100N/mm²The above.

4. The method for providing a base article according to any one of claims 1 to 3,

in the long body, one or more films are wound in a spiral shape so as to be wound in a right-hand roll, and one or more films are wound in a spiral shape so as to be wound in a left-hand roll.

5. The method for providing a base article according to any one of claims 1 to 4,

the film has a thickness of 2 to 25 [ mu ] m.

6. The method for providing a base article according to any one of claims 1 to 5,

the one or more films are formed by laminating at least a polytetrafluoroethylene film and a thermoplastic fluororesin film.

7. The method of providing a base article according to claim 1,

the outer diameter of the mandrel is 0.05mm to 10 mm.

8. A method for providing a base product, characterized in that,

the base product is a cylindrical elongated body composed of at least polytetrafluoroethylene,

the average thickness of the long body is more than 5 μm and less than 75 μm,

using the measured value obtained by the tensile test according to JIS K7127-1999, the stress N/mm is represented by the horizontal axis in% strain²In the stress-strain curve of the elongated body taken as the vertical axis,

when the stress-strain curve is regarded as a single peak, the full width at half maximum of the peak is in the range of 10% to 150%,

the elongated body is provided in a state of being in contact with the mandrel.

9. A mandrel coated by an elongated body, comprising a mandrel and an elongated body,

the long body is formed by winding at least one film spirally around the mandrel and forming the at least one film without a gap,

at least one of the at least one membrane is comprised of at least polytetrafluoroethylene,

the average thickness of the long body is 5-75 μm.

10. The mandrel coated by an elongated body according to claim 9,

using the measured value obtained by the tensile test according to JIS K7127-1999, the stress N/mm is represented by the horizontal axis in% strain²In the stress-strain curve of the elongated body taken as the vertical axis,

when the stress-strain curve is regarded as a single peak, the full width at half maximum of the peak is in the range of 10% to 150%.

11. The mandrel covered by an elongated body according to claim 9 or 10,

the tensile strength at 20% displacement of the long body obtained by a tensile test according to JIS K7127-1999 is 100N/mm²The above.

12. The mandrel covered by an elongated body according to any one of claims 9 to 11,

in the long body, one or more films are wound in a spiral shape so as to be wound in a right-hand roll, and one or more films are wound in a spiral shape so as to be wound in a left-hand roll.

13. The mandrel covered by an elongated body according to any one of claims 9 to 12,

the film has a thickness of 2 to 25 [ mu ] m.

14. The mandrel covered by an elongated body according to any one of claims 9 to 13,

the one or more films are formed by laminating at least a polytetrafluoroethylene film and a thermoplastic fluororesin film.

15. The mandrel coated by an elongated body according to claim 9,

the outer diameter of the mandrel is 0.05mm to 10 mm.

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