JP2009072923A - Method and apparatus for producing resin belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for producing a resin belt which can prevent the occurrence of a set trace caused by a change with the passage of time without being accompanied by an increase in process number and is excellent in cost properties. <P>SOLUTION: In the method for producing the resin belt, a composition containing a thermoplastic resin extruded from an extruder through an annular die 11 is cooled/solidified to be molded in the shape of a tube. The tubular composition 1 extruded from the annular die 11 is carried on the periphery of a first mandrel 12. Next, the composition 1, while being carried on a second mandrel 13 having a diameter not exceeding the diameter of the first mandrel 12, is heat-treated at a prescribed temperature of at least the glass transition temperature and not exceeding the melting temperature of the thermoplastic resin and then taken over continuously. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a resin belt manufacturing method and manufacturing apparatus (hereinafter also simply referred to as “belt”, “manufacturing method”, and “manufacturing apparatus”), and more specifically, to electrophotographic apparatuses such as copying machines and printers and electrostatic recording. The present invention relates to a manufacturing method and a manufacturing apparatus for a resin belt used as an intermediate transfer belt, a transfer conveyance belt, or the like in an apparatus.

  Conventionally, in an electrostatic recording process in an image forming apparatus such as a copying machine or a printer, first, the surface of a photosensitive member (latent image holding member) is uniformly charged, and an image is projected onto the photosensitive member from an optical system. An electrostatic latent image is formed by erasing the charged portion of the light, and then a toner is supplied to the electrostatic latent image to form a toner image by electrostatic adhesion of the toner. A method of printing by transferring to a recording medium such as OHP or photographic paper is employed.

  In such an electrostatic recording process, when transferring a toner image to a recording medium such as paper, the toner image is temporarily held on its surface (intermediate transfer method), or the recording medium is A transfer belt made of rubber having a semiconductive resin film or a fiber reinforcement is used to transfer the toner image directly to the photoreceptor (transfer transfer system). Among these, as a method for producing a resin film belt made of a resin film, a technique by extrusion molding using an annular die is conventionally known.

  As an improved technique related to the extrusion of such a belt, for example, in Patent Document 1, a gas whose supply pressure and supply amount are controlled is placed inside an uncured resin tube extruded from an annular die attached to an extruder. Disclosed is a film manufacturing method in which the inner surface of a resin tube is cooled and solidified by bringing the inner surface of a resin tube into contact with the outer peripheral surface of the cooling mandrel while being continuously supplied and discharged, and is continuously drawn while maintaining the tube state. Yes. Further, in Patent Document 2, the resin tube extruded from the annular die is brought into contact with the surface of the cooling mandrel without supplying gas to the inner surface of the resin tube, and then cooled and solidified. A method of manufacturing a belt that is taken up by a feeding mechanism while being in contact with the belt is disclosed.

Furthermore, in Patent Document 3, for the purpose of obtaining an endless belt imparted with heat shrinkability, a resin tube extruded from an annular die is cooled and solidified by a first mandrel, and then hot gas is blown onto the outer peripheral surface of the tube. In addition, a method of manufacturing a belt material is disclosed in which a tube is weakly stretched by a second mandrel having an outer diameter larger than that of the first mandrel while the tube is softened to some extent, and the tube is continuously pulled.
JP-A-1-228823 (Claims etc.) JP 2001-138380 A (Claims etc.) JP-A-9-29840 (Claims etc.)

  In general, the transfer belt is used in a state where it is stretched by a plurality of rollers from the inside. However, at this time, a roller-shaped set mark is generated due to the change of the belt material with time, and the image defect is caused. was there. The main cause of the change of the belt material with time is movement of a polymer component in the material constituting the belt, and the degree of such a set mark becomes large particularly in a high temperature and high humidity environment.

  In this regard, the manufacturing methods disclosed in Patent Documents 1 and 2, although excellent in continuous productivity, a belt can be obtained in a state where the relaxation of molecules in the belt is not sufficiently completed because the cooling rate is fast, As a result, the amount of movement of the molecules increases due to the change over time after the production, and there is a problem that the set mark tends to be large. As a solution to this problem, it is conceivable to perform heat treatment before using the belt so that the molecules are sufficiently relaxed. In this case, however, the number of heat treatment steps increases, which is another cost increase. Problems arise.

  Further, in the case of the production method disclosed in Patent Document 3, the molecular chain is elongated by weak stretching, so that the amount of movement of the molecules increases with time than the belt obtained by the production methods of Patent Documents 1 and 2 above. , Set marks will get worse. Therefore, the conventional manufacturing method does not sufficiently prevent the occurrence of set marks due to changes over time during use, and establishes a cost-effective belt manufacturing technique that can eliminate the problem of set marks without increasing the number of processes. Was desired.

  Accordingly, an object of the present invention is to provide a cost-effective resin belt manufacturing method and apparatus capable of solving the above-described problems and preventing the occurrence of set marks due to changes over time without increasing the number of processes. There is to do.

  As a result of intensive studies, the inventors of the present invention continuously cooled and solidified the belt material extruded into a tube shape with a first mandrel, and then heat treated it with a second mandrel having a diameter equal to or smaller than the first mandrel. As a result, the inventors have found that the above problems can be solved, and have completed the present invention.

That is, the method for producing a resin belt of the present invention is a method for producing a resin belt in which a composition containing a thermoplastic resin extruded from an extruder through an annular die is cooled and solidified and formed into a tube shape,
The tubular composition extruded from the annular die is supported on the outer periphery of the first mandrel, cooled, and then supported on a second mandrel having a diameter equal to or less than the diameter of the first mandrel. It is characterized by being continuously taken out after heat treatment at a predetermined temperature not lower than the glass transition temperature and not higher than the melting point of the thermoplastic resin.

  In the production method of the present invention, a thermostatic bath is disposed on the outer periphery of the second mandrel, and the temperature of the second mandrel is adjusted to the predetermined temperature, or a heat medium is circulated inside the second mandrel, A method of adjusting the temperature of the second mandrel to the predetermined temperature, or spraying a gas of the predetermined temperature on the outer peripheral surface of the tubular composition immediately before or during contact with the second mandrel Can be suitably used. The production method of the present invention can be suitably applied to the production of a laminated belt having two or more layers.

The resin belt manufacturing apparatus of the present invention includes an annular die attached to an extruder, a first mandrel and a take-up roll that are sequentially arranged coaxially with the annular die, and through the annular die. A resin belt manufacturing apparatus for cooling and solidifying a composition containing an extruded thermoplastic resin into a tube shape,
A tube-shaped composition in which a second mandrel having a diameter equal to or smaller than the diameter of the first mandrel is disposed on the same axis between the first mandrel and the take-up roll, and the first mandrel is extruded from the annular die. The temperature of the second mandrel is adjusted to a temperature at which an object is supported on the outer periphery and can be cooled, and the temperature is not lower than the glass transition temperature and not higher than the melting point of the thermoplastic resin.

  In the manufacturing apparatus of this invention, it is preferable that the thermostat is arrange | positioned at the outer periphery of the said 2nd mandrel, or the heat medium has circulated inside the said 2nd mandrel.

In addition, another resin belt manufacturing apparatus of the present invention includes an annular die mounted on an extruder, a first mandrel and a take-up roll that are sequentially arranged coaxially with the annular die, and the annular die is provided with the annular die. An apparatus for producing a resin belt that cools and solidifies a composition containing a thermoplastic resin extruded through a tube,
A tube-shaped composition in which a second mandrel having a diameter equal to or smaller than the diameter of the first mandrel is disposed on the same axis between the first mandrel and the take-up roll, and the first mandrel is extruded from the annular die. Is adjusted to a temperature that can be cooled while being supported on the outer periphery, and a temperature adjusting mechanism capable of blowing a gas having a temperature not lower than the glass transition temperature and not higher than the melting point of the thermoplastic resin is disposed in the vicinity of the second mandrel. It is characterized by that.

  According to the present invention, the above configuration realizes a cost-effective resin belt manufacturing method and manufacturing apparatus capable of preventing the occurrence of set marks due to changes over time without increasing the number of processes. It became possible.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic explanatory diagram of a resin belt manufacturing apparatus according to a preferred embodiment of the present invention. A resin belt manufacturing apparatus 10 shown in the figure includes an annular die 11 mounted on an extruder (not shown), a first mandrel 12 and a take-up roll 14 which are sequentially arranged coaxially therewith. A composition 1 containing a thermoplastic resin extruded through a die 11 is cooled and solidified and formed into a tube shape.

  In the manufacturing apparatus of the present invention, a second mandrel 13 having a diameter equal to or smaller than the diameter of the first mandrel 12 is arranged on the same axis between the first mandrel 12 and the take-up roll 14, and is extruded from the annular die 11. The formed tubular composition 1 passes through the two mandrels 12 and 13. Of these two mandrels, the first mandrel 12 is usually provided for cooling and solidifying the extruded tube-shaped composition 1, and the tube-shaped composition 1 extruded from the annular die 11 is disposed on the outer periphery. It is adjusted to a temperature at which it can be supported and cooled.

  On the other hand, the 2nd mandrel 13 provided in this invention is a mandrel for heat processing for heat-processing the tube-shaped composition 1 once cooled and solidified, The glass transition temperature of the thermoplastic resin which comprises this tube-shaped composition 1 The temperature is adjusted to (Tg) or higher and the melting point or lower. In the manufacturing apparatus of the present invention, the second mandrel 13 is provided after the first mandrel 12, and the tube-shaped composition 1 cooled and solidified by the second mandrel 13 is subjected to heat treatment, thereby relaxing the molecules in the belt. As a result, it is possible to prevent the occurrence of set marks due to subsequent changes over time. Further, in the present invention, as shown in the drawing, the cooling and solidification in the first mandrel 12, the heat treatment in the second mandrel 13, and the take-up of the heat-treated tubular composition 1 by the take-up roll 14 are performed in one apparatus. Since it can be carried out continuously, there is no increase in the number of steps as in the case where the heat treatment step is performed separately. Therefore, it is possible to obtain a belt with a small roller set trace at a low cost without a problem of cost increase.

  The 2nd mandrel 13 should just be adjusted to the temperature below Tg of the thermoplastic resin which comprises the tubular composition 1, and below melting | fusing point. In the case of an amorphous resin among thermoplastic resins, the temperature is set to Tg or higher. If this temperature is lower than the Tg of the thermoplastic resin of the tubular composition 1, the temperature is too low to obtain a sufficient molecular relaxation effect. In the case of a crystalline resin, if the temperature exceeds the melting point, the temperature is too high, resulting in deterioration of the surface property of the belt or deformation of the belt shape. In addition, when using 2 or more types of thermoplastic resins for the tubular composition 1, the said temperature shall be the highest Tg or more and the temperature below the lowest melting | fusing point. The reason why the second mandrel 13 is set to have a diameter equal to or smaller than the diameter of the first mandrel 12 is to facilitate relaxation of molecules. The specific diameter of the second mandrel 13 may be, for example, 80 to 100% of the diameter of the first mandrel 12 although it depends on the dimensions of the target product belt. In addition, about the material of the 2nd mandrel 13, the metal generally used conventionally can be used and the thing with favorable heat conductivity is preferable.

  In the present invention, the method for adjusting the temperature of the second mandrel 13 to the specific range is not particularly limited. For example, as shown in the figure, the second mandrel 13 is disposed on the outer periphery of the second mandrel 13. The method of arrange | positioning the thermostat 15 so that 13 may be covered is mentioned. In this case, the second mandrel 13 and the tubular composition 1 on the outer periphery thereof can be uniformly heated as a whole by the heat source 16 such as an infrared heater disposed in the thermostat 15, which is efficient. Although not shown, a fan can be arranged inside the thermostat 15 to circulate the internal atmosphere. In addition, as in the manufacturing apparatus 20 according to another embodiment of the present invention shown in FIG. 2, the thermostat is not provided, and the heat medium is circulated inside the second mandrel 23 similarly to the first mandrel 12, It is also possible to adjust the temperature of the second mandrel 23.

  Furthermore, in the present invention, as in the manufacturing apparatus 30 according to still another embodiment of the present invention shown in FIG. 3, the temperature adjustment mechanism 17 such as a temperature adjustment ring is disposed in the vicinity of the second mandrel 33, The tube-shaped composition 1 may be sprayed with a gas having a temperature not lower than Tg and not higher than the melting point of the thermoplastic resin constituting the tube-shaped composition 1. Also in this case, the tubular composition 1 can be heat-treated on the second mandrel 13 by the temperature adjusting mechanism 17, and the same effect as in the case of the manufacturing apparatus of FIGS. 1 and 2 can be obtained. In this case, it is conceivable that only the temperature control mechanism 17 is provided and the second mandrel 13 is not provided. However, if the second mandrel 13 is not provided, the shape of the tubular composition 1 cannot be sufficiently maintained. Moreover, the position of the temperature control mechanism 17 can spray a gas with respect to the outer peripheral surface of the tubular composition 1 immediately before or during the passage of the second mandrel 13, or both immediately before and during the passage. There is no particular limitation. In addition, in FIGS. 1-3, the code | symbol 18 shows a support bar. Here, as shown in FIG. 1 and FIG. 3, when temperature adjustment is performed from the outside of the second mandrel, it is not always necessary to perform temperature adjustment by circulation of the heat medium from the inside of the second mandrel. Is preferably performed in combination with temperature adjustment from the inside and outside of the second mandrel.

  The apparatus for producing a resin belt according to the present invention may be any apparatus as long as the second mandrel is disposed in addition to the first mandrel that is normally used, and the tubular composition can be heated to a predetermined temperature on the outer periphery thereof. About a structure, a conventionally well-known apparatus structure can be employ | adopted suitably and it does not restrict | limit in particular.

  The first mandrel 12 only needs to be adjusted to a temperature at which the tube-shaped composition 1 is supported on the outer periphery and can be cooled. As a result, the extruded tube-shaped composition 1 is converted into the first mandrel 12. By being in contact with the outer periphery of the resin, it is cooled from the extrusion temperature to a certain low temperature and solidifies. As the material of the first mandrel 12, a metal generally used conventionally can be used as in the case of the second mandrel 13. Moreover, there is no restriction | limiting in particular about the specific temperature of the 1st mandrel 12, Although it should just be the temperature which the tube-shaped composition 1 solidifies, For example, surface temperature can be 30-120 degreeC.

  Here, in the manufacturing apparatus of the present invention, the arrangement location of the first and second mandrels depends on the extrusion temperature and the like. For example, the first mandrel 12 is positioned 30 to 200 mm from the outlet of the annular die 11. The second mandrel 13 can be positioned 500 to 1500 mm from the lower end of the first mandrel 12. A separate take-up roll (not shown) may be provided between the first and second mandrels.

  Moreover, the manufacturing method of the resin belt of this invention is a manufacturing method which cools and solidifies the composition containing the thermoplastic resin extruded through the cyclic | annular die from the extruder, and shape | molds it in a tube shape. It can implement using the manufacturing apparatus of this invention as shown. In the production method of the present invention, as shown in the figure, the tube-shaped composition 1 extruded from the annular die 11 is cooled by being supported on the outer periphery of the first mandrel 12, and then the diameter of the first mandrel 12 or less. In a state of being supported on the second mandrel 13 having a diameter of 2 mm, heat treatment is performed at a predetermined temperature not lower than the melting point and not higher than the melting point of the thermoplastic resin constituting the tubular composition 1. Thereafter, by continuously taking up with the take-up roll 14, a resin belt that suppresses the generation of set marks due to changes over time can be obtained at a low cost by one continuous process.

  In the case of producing an endless belt by extrusion using an annular die as shown in the figure, in a laminated belt having two or more layers, for example, a two-layer laminated belt composed of a base layer and a surface layer, the resin composition constituting each layer Due to the difference in shrinkage between the objects, warping may occur at the cut end (end in the width direction of the belt), but in the present invention, the effect of reducing the warpage of the cut surface can also be obtained. it can.

  Also in the method for producing the resin belt of the present invention, the second mandrel may be disposed and the tubular composition 1 may be heated to a predetermined temperature on the outer periphery thereof. It can be determined as appropriate and is not particularly limited. For example, the resin composition used for extrusion can be prepared by appropriately mixing and kneading the compounding components of the belt using a biaxial kneader or the like. Moreover, the tubular composition taken up by the take-up roll is then appropriately cut into lengths (widths) to form an endless tubular resin belt.

  The present invention is a technique applicable when using a composition containing a thermoplastic resin as a belt material, and is not particularly limited with respect to a specific belt formulation as long as such conditions are satisfied. The belt material can be appropriately selected from those normally used as a belt material.

Hereinafter, the present invention will be described in more detail with reference to examples.
<Example 1>
Polyester elastomer (E-450B, Tg: -70 ° C, melting point: 222 ° C) manufactured by Toyobo Co., Ltd. and polybutylene terephthalate (PBT) (Duranex 800FP, Tg: 22 ° C, manufactured by Polyplastics Co., Ltd. Melting point: 223 ° C.) and carbon black (Denka Black granular) manufactured by Denki Kagaku Kogyo Co., Ltd., kneaded at 250 ° C. with a φ30 mm twin screw extruder at a blending ratio of 60/40/18, A resin composition for production was obtained.

  As shown in FIG. 2, the resin composition is uniaxially extruded with a diameter of 30 mm using a manufacturing apparatus provided coaxially with an annular die 11, a first mandrel 12, a second mandrel 13 and a take-up roll 14 mounted on an extruder. The resin belt was manufactured by extruding with a machine. The extruder and the annular die 11 are set to 260 ° C., the extrusion hole of the annular die 11 is φ155 mm, the distance from the outlet of the annular die 11 to the first mandrel 12 is 50 mm, the lower end of the first mandrel 12 and the second mandrel 13 The distance between the upper ends was 1000 mm. Further, the outer diameter of the first mandrel 12 was φ140 mm, the outer diameter of the second mandrel 13 was φ138 mm, and the mandrel temperature was adjusted to 120 ° C. and 150 ° C. by circulating a heat medium therein. As a result, a resin belt having a thickness of 100 μm and a width of 250 mm was finally obtained.

<Example 2>
While adjusting the temperature of the second mandrel 13 with a heat medium, as shown in FIG. 3, a temperature adjustment ring 17 is disposed in the vicinity of the second mandrel 13, and the tube-shaped composition 1 is controlled by the temperature adjustment ring 17. A resin belt was obtained under the same conditions as in Example 1 except that hot air of 150 ° C. was blown.

<Example 3>
While adjusting the temperature of the second mandrel 13 with the heat medium, as shown in FIG. 1, the thermostat 15 is arranged on the outer periphery of the second mandrel 13, and the temperature inside the thermostatic layer 15 is set to 150 ° C. A resin belt was obtained under the same conditions as in Example 1 except that the temperature of the mandrel 13 was adjusted.

<Comparative Example 1>
A resin belt was obtained under the same conditions as in Example 1 except that the second mandrel was not disposed.

<Comparative example 2>
A resin belt was obtained under the same conditions as in Example 2 except that the outer shapes of the first mandrel 12 and the second mandrel 13 were φ130 mm and φ140 mm, respectively.

<Evaluation method>
Each belt was stretched with a load of 2.5 kgf using two aluminum pipes with a diameter of 16 mm, and the belt was left under the two conditions shown in Table 1 below. Thereafter, the belt was further allowed to stand at 23 ° C. and 50% RH for 24 hours, and then each belt was incorporated into a color laser printer as an intermediate transfer belt, and image evaluation was performed. The degree of image failure due to the roller set marks was evaluated in four stages: ◎: remarkably good, ○: good, Δ: bad, ×: remarkably bad. If the evaluation result is ◯ or more, there is no practical problem. The results are shown in Table 1 below.

  As shown in Table 1 above, in the example in which the second mandrel having a diameter smaller than the diameter of the first mandrel was disposed after the first mandrel and the heat treatment after cooling and solidification was performed, Comparative Example 1 in which the heat treatment was not performed It was confirmed that the effect of improving the set marks was obtained as compared with any of Comparative Example 2 in which heat treatment was performed with the second mandrel having a diameter larger than that of the first mandrel.

<Example 4>
100 parts by weight of polybutylene naphthalate (PBN) (TQB-OT, Tg: 78 ° C., melting point: 243 ° C.) manufactured by Teijin Chemicals Limited, and carbon black (Denka Black granular) 12 manufactured by Denki Kagaku Kogyo Co., Ltd. A two-layer laminated belt was produced using the resin composition kneaded at 260 ° C. in a φ30 mm twin screw extruder for the surface layer and the resin composition used in Example 1 for the base layer.

  A surface layer material and a base layer material are each extruded by a φ25, 30 mm single screw extruder, and a two-layer two-layer annular die is used to form a two-layer two-layer laminated resin belt as shown in FIG. Manufactured. The extruder and the annular die 11 are set to 260 ° C., the extrusion hole of the annular die 11 is φ155 mm, the distance from the outlet of the annular die 11 to the first mandrel 12 is 50 mm, the lower end of the first mandrel 12 and the second mandrel 13 The distance between the upper ends was 1000 mm. The outer diameter of the first mandrel 12 was φ140 mm, the outer diameter of the second mandrel 13 was φ138 mm, and the mandrel temperature was adjusted to 120 ° C. and 150 ° C. by circulating a heat medium inside. As a result, a laminated resin belt having a surface layer thickness of 15 μm, a base layer thickness of 85 μm (total thickness of 100 μm), and a width of 250 mm was finally obtained.

<Example 5>
While adjusting the temperature of the second mandrel 13 with a heat medium, as shown in FIG. 3, a temperature adjustment ring 17 is disposed in the vicinity of the second mandrel 13, and the tube-shaped composition 1 is controlled by the temperature adjustment ring 17. A laminated resin belt was obtained under the same conditions as in Example 4 except that hot air of 150 ° C. was blown.

<Example 6>
While adjusting the temperature of the second mandrel 13 with the heat medium, as shown in FIG. 1, the thermostat 15 is arranged on the outer periphery of the second mandrel 13, and the temperature inside the thermostatic layer 15 is set to 150 ° C. A laminated resin belt was obtained under the same conditions as in Example 4 except that the temperature of the mandrel 13 was adjusted.

<Comparative Example 3>
A laminated resin belt was obtained under the same conditions as in Example 4 except that the second mandrel was not disposed.

<Comparative example 4>
A laminated resin belt was obtained under the same conditions as in Example 4 except that the outer shapes of the first mandrel 12 and the second mandrel 13 were φ130 mm and φ140 mm, respectively.

  As a result, in Comparative Example 3 in which heat treatment was not performed and in Comparative Example 4 in which heat treatment was performed with a second mandrel having a diameter larger than that of the first mandrel, the belt cut surface was warped inward. In Examples 4 to 6 in which heat treatment was performed with a second mandrel having a diameter smaller than that of one mandrel, no warpage occurred on the cut surface. As a result, it was confirmed that the present invention is also useful for manufacturing a laminated belt.

It is a schematic explanatory drawing which shows the manufacturing apparatus of the resin belt which concerns on one embodiment of this invention. It is a schematic explanatory drawing which shows the manufacturing apparatus of the resin belt which concerns on other embodiment of this invention. It is a schematic explanatory drawing which shows the manufacturing apparatus of the resin belt which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tubular composition 10 Resin belt manufacturing apparatus 11 Annular die 12 First mandrel 13, 23, 33 Second mandrel 14 Take-up roll 15 Constant temperature bath 16 Heat source 17 Temperature control mechanism 18 Support rod

Claims (9)

A method for producing a resin belt in which a composition containing a thermoplastic resin extruded from an extruder through an annular die is cooled and solidified and formed into a tube shape,
The tubular composition extruded from the annular die is supported on the outer periphery of the first mandrel, cooled, and then supported on a second mandrel having a diameter equal to or less than the diameter of the first mandrel. A method for producing a resin belt, comprising: heat treating at a predetermined temperature not lower than a glass transition temperature and not higher than a melting point of a thermoplastic resin, and continuously taking it out.   The method for producing a resin belt according to claim 1, wherein a thermostatic bath is disposed on an outer periphery of the second mandrel, and the temperature of the second mandrel is adjusted to the predetermined temperature.   The method for producing a resin belt according to claim 1, wherein a heat medium is circulated inside the second mandrel to adjust the temperature of the second mandrel to the predetermined temperature.   The method for producing a resin belt according to claim 1, wherein the gas at the predetermined temperature is blown against the outer peripheral surface of the tubular composition immediately before or during contact with the second mandrel.   The method for producing a resin belt according to any one of claims 1 to 4, which is used for producing a laminated belt having two or more layers. An annular die mounted on an extruder, a first mandrel and a take-up roll sequentially arranged coaxially with the annular die, and a composition comprising a thermoplastic resin extruded through the annular die, An apparatus for producing a resin belt that is cooled and solidified and formed into a tube shape,
A tube-shaped composition in which a second mandrel having a diameter equal to or smaller than the diameter of the first mandrel is disposed on the same axis between the first mandrel and the take-up roll, and the first mandrel is extruded from the annular die. Production of a resin belt, wherein the temperature is adjusted to a temperature at which an object is supported on the outer periphery and can be cooled, and the second mandrel is adjusted to a temperature not lower than the melting point and not higher than the melting point of the thermoplastic resin. apparatus.   The apparatus for producing a resin belt according to claim 6, wherein a thermostatic bath is disposed on an outer periphery of the second mandrel.   The apparatus for producing a resin belt according to claim 6, wherein a heat medium circulates inside the second mandrel. An annular die mounted on an extruder, a first mandrel and a take-up roll sequentially arranged coaxially with the annular die, and a composition comprising a thermoplastic resin extruded through the annular die, An apparatus for producing a resin belt that is cooled and solidified and formed into a tube shape,
A tube-shaped composition in which a second mandrel having a diameter equal to or smaller than the diameter of the first mandrel is disposed on the same axis between the first mandrel and the take-up roll, and the first mandrel is extruded from the annular die. Is adjusted to a temperature that can be cooled while being supported on the outer periphery, and a temperature adjusting mechanism capable of blowing a gas having a temperature not lower than the glass transition temperature and not higher than the melting point of the thermoplastic resin is disposed in the vicinity of the second mandrel. An apparatus for producing a resin belt, characterized by comprising:

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