Thermoforming device and heat insulation sheet

Abstract

The purpose of the present invention is to provide a thermoforming device that can save energy at a heating unit. A thermoforming device 100 comprises a heating unit 150 that has an upper heating means 151 and a lower heating means 152 that heat a resin sheet S from above and below, respectively, a shaping unit 200 that shapes the resin sheet S, and a transport mechanism 155 that transports the resin sheet S. A heat insulation sheet (upper heat insulation sheet 161 and lower heat insulation sheet 171) is removably fixed to an outside surface of the upper heating means 151 and the lower heating means 152.

Description

Thermoforming equipment and heat insulating sheet

[0001] The present invention relates to an energy-saving technology for a thermoforming device, and more specifically, to a technology for reducing heater output by using a heat insulating material in a heating section.

[0002] Many thermoforming devices are configured to have a heating process for heating a resin sheet and a molding process for molding the heated resin sheet. In thermoforming devices where the heating process and molding process are separate, the resin sheet must be heated at a constant high temperature during the heating process so that the resin sheet will reach an appropriate temperature during the molding process. This heating process involves using heaters above and below the resin sheet, which require a large amount of power.

[0003] Patent Document 1 discloses a technique related to an insulating cover for injection or extrusion molding. Patent Document 2 discloses a technique related to a thermoforming device and a thermoforming method using a hot plate. As described above, the insulating cover as shown in Patent Document 1 can be provided by wrapping it around the outer periphery of the heating barrel, making it easy to provide the insulating cover. However, in the case of a thermoforming machine as shown in Patent Document 2, which is equipped with a sheet conveying mechanism and unwinds and forms a long resin sheet, it is necessary to configure the machine so that insulating material is placed above or below the heated portion.

[0004] JP 2004-314549 A JP 2013-031930 A

[0005] However, as shown in Patent Document 2, this makes it difficult to prevent heat dissipation from the side of the heating section of the thermoforming device, and no countermeasures have been taken to date. The heating section of the thermoforming device is equipped with heaters arranged above and below, and the resin sheet must be heated while being transported between them. This process results in heat dissipation from both sides of the resin sheet. This section is equipped with a sheet feed mechanism, making it difficult to install insulation. In addition, the side surfaces have protrusions that must be connected to a movable water jacket, wiring, piping, etc., which also makes it difficult to install insulation.

[0006] However, due to the current situation, energy-saving performance is also required for thermoforming equipment, and there is a strong desire to reduce power consumption. In particular, the heating part constantly outputs high temperatures, so a large amount of electricity is required during production, and energy loss has been an issue.

[0007] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a thermoforming device that can achieve energy savings in the heating section.

[0008] In order to achieve the above object, a thermoforming apparatus according to one aspect of the present invention has the following features.

[0009] (1) A thermoforming device including a heating section having upper heating means for heating a resin sheet from above and lower heating means for heating the resin sheet from below, a molding section for molding the resin sheet, and a conveying mechanism for conveying the resin sheet, wherein a heat insulating sheet is detachably fixed to the outer surfaces of the upper heating means and the lower heating means, the heat insulating sheet being formed by sewing a cloth material having heat insulating properties, and including an upper heat insulating sheet arranged on the upper side divided by the conveying surface of the resin sheet conveyed by the conveying mechanism and fixed to the outer surface of the upper heating means, and a lower heat insulating sheet arranged below the heating section and fixed to the outer surface of the lower heating means, the upper heat insulating sheet and the lower heat insulating sheet having a heating section zone in contact with the outer surface of the heating section and a supply section zone extending from the heating section zone to the conveying surface side, and the lower heat insulating sheet having pillar sections arranged in parallel at regular intervals and perpendicular to the feeding direction of the resin sheet, and aggregates being passed through the pillar sections, It is characterized by:

[0010] The aspect described in (1) above can reduce heat dissipation from the heating section, thereby saving energy and improving the working environment. This is because providing an insulating sheet on the outer surface of the heating section of the thermoforming device reduces heat dissipation from the sides of the heating section and from the section transporting the resin sheet, thereby reducing the power consumption used for heating. The insulating sheet is composed of an upper insulating sheet and a lower insulating sheet, and is configured with a heating section zone and a supply section zone. Therefore, the heating section zone prevents heat dissipation from the outer surface of the heating section (upper heating means and lower heating means), and the supply section zone is equipped with a transport mechanism for transporting the resin sheet, thereby minimizing heat dissipation as much as possible. Adopting such a configuration can contribute to energy savings in the thermoforming device.

[0011] (2) In the thermoforming device described in (1), it is preferable that a heat-resistant magnet is used as a fixing means for the upper insulation sheet and the lower insulation sheet, and that a ferromagnetic metal is used on the outer surface of the housing used in the heating section.

[0012] According to the aspect (2) above, the use of heat-resistant magnets makes it easy to remove the upper and lower insulation sheets. When performing maintenance on a thermoforming device, it is desirable that the insulation sheets be easy to remove, and if a ferromagnetic metal is used for the housing and magnets are used to attach the upper and lower insulation sheets, the ease of removal is highly effective in terms of improving maintainability.

[0013] (3) In the thermoforming device described in (1) or (2), it is preferable that the shielding plate provided in the heating section has a water channel formed therein and is provided with piping connected to the water channel, and that electrical wiring connected to the heating section is provided, and that the upper insulation sheet or the lower insulation sheet has a slit portion to avoid the piping and the electrical wiring.

[0014] According to the aspect described in (3) above, the upper heat insulating sheet and the lower heat insulating sheet can be arranged so as to avoid piping and electrical wiring.

[0015] In order to achieve the above object, a heat insulating sheet according to another aspect of the present invention has the following features.

[0016] (4) An insulating sheet attached to the side of a heating section of a thermoforming machine equipped with a heating section that heats a resin sheet, the insulating sheet comprising an upper insulating sheet arranged above the heating section divided by the conveying surface of the resin sheet, and a lower insulating sheet arranged below the heating section, wherein the upper insulating sheet and the lower insulating sheet use silicone-coated glass cloth as an outer skin and glass wool as an inner insulating material, the insulating sheet comprising a heating section zone in contact with the thermoforming machine and a supply section zone extending from the heating section zone, the heating section zone and the supply section zone being separated by a sewing section sewn together with heat-resistant thread, notches being provided corresponding to the protrusions of the heating section, and the lower insulating sheet being provided with a bag section into which supports are inserted at regular intervals.

[0017] The aspect described in (4) above can suppress heat radiation from the heating section of the thermoforming machine, thereby reducing power consumption and contributing to energy conservation. This is because the upper and lower insulation sheets, which are separated by the conveying surface, are used, so a configuration can be selected that covers the separated portion to the maximum extent, thereby reducing the area from which heat is radiated.

[0018] (5) In the heat insulating sheet described in (4), it is preferable that the upper heat insulating sheet and the lower heat insulating sheet are fixed to the thermoforming machine using heat-resistant magnets.

[0019] According to the aspect (5) above, the heat insulating sheet is fixed using a heat-resistant magnet, so that the heat insulating sheet can be easily attached and detached to the thermoforming device. The fact that the heat insulating sheet can be easily attached and detached during maintenance of the thermoforming device is beneficial because it leads to improved workability.

[0020] (6) A heat insulating sheet attached to the side of a heater hot plate in a vacuum / pressure forming machine, characterized in that it has a thickness of 5 mm to 20 mm and has a hot plate zone and a supply zone, the supply zone is formed to fit the shape of protrusions such as rail wiring of the vacuum / pressure forming machine, and the lower heat insulating sheet attached to the bottom of the heater hot plate has a function of inserting a support pillar to make it self-standing.

[0021] The aspect described in (6) above makes it possible to suppress heat radiation from the side of the heater hot plate (heating section) of a vacuum / pressure forming machine (thermoforming machine), thereby reducing the power consumption of the vacuum / pressure forming machine and contributing to energy conservation. This is because the use of a heat insulating sheet can reduce the openings in the heating section as much as possible, thereby contributing to improving the heating efficiency of the heating section.

[0022] (7) In the heat insulating sheet described in (6), it is preferable that a slit is provided in the heat insulating sheet so that the water jacket can be attached even if it is movable.

[0023] According to the aspect described in (7) above, it is possible to make the heat insulating sheet function without interfering with the movement of the water jacket.

[0024] (8) In the heat insulating sheet according to (6) or (7), it is preferable that a heat-resistant magnet is provided on the heat insulating sheet.

[0025] According to the aspect described in (8) above, the heat insulating sheet can be easily attached and detached, and improvement in maintenance ease is expected.

[0026] Fig. 5 is a schematic diagram of a thermoforming device of this embodiment. Fig. 6 is a schematic diagram showing a conveying mechanism portion of the thermoforming device of this embodiment. Fig. 7 is a cross-sectional view of a heating unit of this embodiment. Fig. 8 is a cross-sectional view of a lower heat insulating sheet of this embodiment. Fig. 9 is a perspective view of a heating unit of this embodiment. Fig. 10 is a perspective view showing a portion of the heating unit of this embodiment that is different from Fig. 5.

[0027] First, an outline of the configuration of a thermoforming apparatus 100 according to a first embodiment of the present invention will be described. FIG. 1 shows a schematic diagram of the thermoforming apparatus 100 according to this embodiment. The thermoforming apparatus 100 includes an unwinding section 110, a heating section 150, a forming section 200, and an unloading section 250, and forms a resin sheet S. The unwinding section 110 has a raw roll 111 set therein and is capable of unwinding a long resin sheet S. The thermoforming apparatus 100 is also provided with a vacuum circuit including a vacuum generator (not shown), allowing vacuum and pressure forming of the resin sheet S.

[0028] The heating section 150 is equipped with an upper heating means 151 and a lower heating means 152 to heat the resin sheet S. The molding section 200 is equipped with an upper mold 201 and a lower mold 202 to thermoform the resin sheet S. The removal section 250 is equipped with a trimming device 251 to trim the resin sheet S, enabling the molded product M to be removed.

[0029] The resin sheet S is a long sheet material made of thermoplastic resin that is unwound from a raw roll 111. According to the JIS standard, a film is defined as a plastic membrane having a thickness of less than 250 μm, and anything thicker than that is defined as a sheet material, but for convenience, the present embodiment uses the term sheet material, and does not preclude the use of a film material in the present invention as needed.

[0030] FIG. 2 is a schematic diagram showing the conveying mechanism portion of the thermoforming device. FIG. 3 is a cross-sectional view of the heating section 150, corresponding to the cross section AA in FIG. 1. The conveying mechanism 155 has a belt 155c wound around a first pulley 155a and a second pulley 155b, and a gripping portion 155d shown in FIG. 3. A motor (not shown) is connected to the first pulley 155a or the second pulley 155b to drive the belt 155c. The conveying mechanism 155 is arranged on both sides of the resin sheet S, i.e., two rows parallel to the thermoforming device 100, and a plurality of gripping portions 155d fixed to the belt 155c grip both ends of the resin sheet S to convey the resin sheet S, as shown in FIG.

[0031] In addition, cooling means 157 is provided between the upper heating means 151 and the lower heating means 152. The cooling means 157 is a movable water jacket, and is configured to circulate cooling water through piping (not shown). The cooling means 157 are disposed above and below the resin sheet S. In other words, they are disposed between the upper heating means 151 and the resin sheet S, and between the lower heating means 152 and the resin sheet S, so as to block heat from the upper heating means 151 and the lower heating means 152 to the resin sheet S. The cooling means 157 is movable back and forth in the traveling direction of the thermoforming apparatus 100.

[0032] Next, the configuration of the heating section 150 will be described. The heating section 150 comprises an upper heating means 151 and a lower heating means 152, each of which includes a plurality of heaters 153 arranged in a tile pattern, each of which performs radiant heating. The heaters 153 are mid-infrared quick response heaters, which are capable of quickly heating the resin sheet S to be heated. When the feed dimension of the resin sheet S is set to match the width x of the upper mold 201 and lower mold 202 provided in the molding section 200 as shown in FIG. 2, this may not be a multiple of the dimension y of the heater 153. By adjusting the position of the cooling means 157, the heat from the heater 153 can be shielded and the heating level of the resin sheet S can be adjusted.

[0033] The upper heating means 151 is disposed on the upper side and is configured to be able to move toward or away from the conveyed resin sheet S from above by a lifting function (not shown). The lower heating means 152 is also configured to be able to move toward or away from the resin sheet S from below by a lifting function (not shown). Note that there are no particular limitations on the means for driving the lifting device that moves the upper heating means 151 and the lower heating means 152, but it is preferable to use a drive mechanism that can be stopped at any position.

[0034] The upper heating means 151 has an upper heater plate 151a on which heaters 153 are arranged, and an upper housing 151b, and an upper heat insulating sheet 161 is provided on the outside of the metal upper housing 151b. The lower heating means 152 has a lower heater plate 152a on which heaters 153 are arranged, and a lower housing 152b, and a lower heat insulating sheet 171 is provided on the outside of the metal lower housing 152b. Note that the upper housing 151b and the lower housing 152b must be made of a ferromagnetic metal (i.e., a metal to which a magnet is attracted).

[0035] Since the resin sheet S is transported between the upper heating means 151 and the lower heating means 152, the heat insulating members must be separated into an upper heat insulating sheet 161 and a lower heat insulating sheet 171 on the surface along which the resin sheet S is transported. Furthermore, as will be described later, the upper heat insulating sheet 161 and the lower heat insulating sheet 171 must be arranged so as not to interfere with the transport of the resin sheet S, the cooling means 157 described above, electrical wiring, etc.

[0036] Figure 4 shows a cross-sectional view of the lower insulation sheet 171. Figures 5 and 6 show perspective views of the heating unit 150. The lower insulation sheet 171 is constructed by wrapping an outer skin 172 made of silicone-coated glass cloth with a silicone (registered trademark) coating to prevent shattering of heat-resistant fibers inside an insulation material 173 filled with an insulation material such as glass wool to improve insulation. The insulation material is approximately 5 to 15 mm thick. The stitching 158 is made by sewing with heat-resistant thread such as Teflon (registered trademark)-coated glass yarn. The insulation material 173 is wrapped in the outer skin 172 and sealed by stitching 158 on the top, bottom, left, and right sides to prevent it from scattering to the outside.

[0037] The lower heat insulating sheet 171 is held to the side of the lower housing 152b by holders 156. The holders 156 are made of bolts 156a, nuts 156b, and heat-resistant magnets 156c, and a plurality of holders 156 are fixed to the lower heat insulating sheet 171. It is desirable to use a samarium-cobalt magnet or an alnico magnet, which exhibits high heat resistance, for example, as the heat-resistant magnets 156c. This is because they are required not to demagnetize even when the heating unit 150 becomes hot.

[0038] The holder 156 is divided into a heating section zone 171b and a supply section zone 171a by a border stitching 158b, allowing for positioning using the border stitching 158b as a marker. The holder 156 is provided in the heating section zone 171b, while the supply section zone 171a protrudes upward from the lower housing 152b. The holder 156 adheres the upper insulating sheet 161 to both outer surfaces of the upper housing 151b, and the lower insulating sheet 171 to both outer surfaces of the lower housing 152b. It is desirable to provide separate insulating material (not shown) on the top surface of the upper housing 151b or the bottom surface of the lower housing 152b.

[0039] The lower insulating sheet 171 has bag-shaped sewn sections 171c at regular intervals, as shown in FIG. 5 . The bag-shaped sewn sections 171c are arranged perpendicular to the longitudinal direction of the lower housing 152b, i.e., the conveyance direction of the resin sheet S, and metal flat plates (not shown) are inserted inside the bag-shaped sewn sections 171c as support columns. This allows the lower insulating sheet 171 to stand on its own and prevents the supply zone 171a from sagging. The material used for the columns must be heat-resistant and lightweight to prevent the lower insulating sheet 171 from slipping. Steel plates are preferably used, with the corners rounded to avoid damaging the lower insulating sheet 171. Of course, materials other than steel may also be used.

[0040] Similar to the lower insulating sheet 171, the upper insulating sheet 161 also has a supply section 161a and a heating section 161b sandwiched by a border stitching 158a. The heating section 161b abuts against the side of the upper housing 151b, while the supply section 161a protrudes downward from the upper housing 151b. The protruding lengths of the supply section zones 161a and 171a are set so as not to interfere with the gripper 155d, other protrusions (such as the cooling means 157), or the conveying mechanism 155. The heating section zone 161b is provided with a plurality of holders 156, and the upper insulating sheet 161, like the lower insulating sheet 171, is easily attached to and detached from the upper housing 151b.

[0041] As shown in Fig. 6, the upper heat insulating sheet 161 and the lower heat insulating sheet 171 are provided with cuts necessary for the wiring 154 and the cooling means 157. The wiring 154 is connected to the lower heating means 152 to supply power. Although Fig. 6 illustrates a single wiring 154, it is not precluded from providing multiple wirings (not shown). The upper heat insulating sheet 161 is provided with multiple cuts 161d, and the lower heat insulating sheet 171 is also provided with multiple cuts 171d.

[0042] The cutout 161d in the upper insulating sheet 161 has a slit in the supply zone 161a to allow for uninterrupted movement of the cooling means 157. The cutout 171d in the lower insulating sheet 171 allows the lower insulating sheet 171 to be removed while avoiding the wiring 154. It is thus preferable that the cutouts 161d, 171d be appropriately provided in the upper insulating sheet 161 and the lower insulating sheet 171 to avoid the protrusions on the heating unit 150, i.e., the portions that protrude from the side surfaces of the upper housing 151b. The shape and location of these protrusions vary depending on the configuration of the thermoforming device 100, so it is necessary to provide the cutouts 161d, 171d, or notches that correspond to the protrusions.

[0043] The thermoforming device 100 of this embodiment has the above-described configuration, and therefore provides the following functions and effects.

[0044] First, the power consumption of the thermoforming device can be reduced, thereby enabling energy savings. This is achieved by providing a thermoforming device 100 equipped with a heating section 150 having upper heating means 151 that heats the resin sheet S from above and lower heating means 152 that heats the resin sheet S from below, a forming section 200 that forms the resin sheet S, and a conveying mechanism 155 that conveys the resin sheet S, in which heat insulating sheets (upper heat insulating sheet 161 and lower heat insulating sheet 171) are detachably fixed to the outer surfaces of the upper heating means 151 and the lower heating means 152.

[0045] The insulating sheets (upper insulating sheet 161 and lower insulating sheet 171) are formed by sewing a thermally insulating fabric material, and include an upper insulating sheet 161 that is arranged on the upper side of the conveying surface of the resin sheet S conveyed by the conveying mechanism 155 and is fixed to the outer surface of the upper heating means 151, and a lower insulating sheet 171 that is arranged below the heating section 150 and is fixed to the outer surface of the lower heating means 152. The upper insulating sheet 161 and the lower insulating sheet 171 have heating section zones 161b, 171b that contact the outer surface of the heating section 150, and supply section zones 161a, 171a that extend from the heating section zones 161b, 171b toward the conveying surface, and the lower insulating sheet 171 is provided with pillar sections (bag-shaped sewn sections 171c) that are arranged in parallel at regular intervals and perpendicular to the feed direction of the resin sheet S, and aggregates are passed through the bag-shaped sewn sections 171c.

[0046] The heating section 150 of the thermoforming device 100 is configured to heat the resin sheet S from above and below using an upper heating means 151 and a lower heating means 152. For this reason, as previously mentioned, it was not possible to prevent heat from radiating from the sides, but by attaching upper heat insulating sheets 161 to both sides of the upper heating means 151 and lower heat insulating sheets 171 to both sides of the lower heating means 152, heat radiation can be prevented.

[0047] Specifically, upper heating means 151 is made up of upper heater plate 151a and upper housing 151b, with upper heat insulating sheet 161 held on the side of upper housing 151b, and lower heating means 152 is made up of lower heater plate 152a and lower housing 152b, with lower heat insulating sheet 171 held on the side of lower housing 152b, which contributes to suppressing heat dissipation from the sides. Also, by providing supply section zones 161a and 171a in upper heat insulating sheet 161 and lower heat insulating sheet 171, it is possible to reduce the opening area of ​​the resin sheet S transport section.

[0048] In a thermoforming device 100 of the type that unwinds a long resin sheet S from a raw material roll 111, a conveying mechanism 155 conveys the resin sheet S from the unwinding section 110 through the heating section 150 to the forming section 200. For this reason, as shown in FIG. 2, the conveying mechanism 155 is disposed at the widthwise end of the resin sheet S, and is configured to grip and convey the end of the resin sheet S. Therefore, the side opening A1 shown in FIG. 3 and the discharge-side opening A2 and the carry-in-side opening A3 shown in FIG. 1 are all open. Due to this structure, it has been difficult to provide a heat insulating material, and it has been thought that the effect would be limited.

[0049] However, the applicant's research has shown that by using the upper and lower insulating sheets 161 and 171 and providing the supply zones 161a and 171a on the upper and lower insulating sheets 161 and 171, energy savings of 5 to 10% compared to conventional methods can be expected. The comparison of power consumption was performed by operating the thermoforming device 100 with and without the upper and lower insulating sheets 161 and 171, and calculating the average power consumption over a certain period of time once the power consumption stabilized. This confirmed that both the current value and power consumption could be reduced even under the same conditions. Furthermore, as a secondary benefit, suppressing heat dissipation from the sides reduces the ambient temperature, potentially improving work performance. This leads to reduced temperature rise within the factory, which also results in energy savings.

[0050] In order to minimize the open area of ​​the side opening A1, the supply zone 171a of the lower heat insulating sheet 171 is provided with multiple bag-shaped sewn sections 171c into which metal plates can be inserted to allow the sheet to stand on its own. This allows the side opening A1 to be adjusted to be as narrow as possible without interfering with the resin sheet S or the conveying mechanism 155.

[0051] Furthermore, heat-resistant magnets are used as a means for fastening the upper and lower insulating sheets 161 and 171, and a ferromagnetic metal is used on the outer surfaces of the upper and lower housings 151b and 152b, making it easy to attach and detach the upper and lower insulating sheets 161 and 171, improving maintainability. Heat-resistant magnets 156c are used for the holders 156 used as a means for fastening the upper and lower insulating sheets 161 and 171, while the upper and lower housings 151b and 152b are made of a ferromagnetic metal, i.e., steel plate, making them easy to attach and detach. This makes it easy to remove the upper and lower insulating sheets 161 and 171 when performing maintenance on the heating unit 150.

[0052] Furthermore, the supply zone 161a and the heating zone 161b of the upper insulation sheet 161 are located on either side of the boundary stitching 158a. The supply zone 171a and the heating zone 171b of the lower insulation sheet 171 are located on either side of the boundary stitching 158a. Therefore, when attaching the upper insulation sheet 161 and the lower insulation sheet 171 to the upper housing 151b and the lower housing 152b, the boundary stitching 158a can be used as a marker for positioning, making installation easy. This configuration also contributes to improved maintainability.

[0053] 6, the cutouts 161d in the upper insulating sheet 161 have multiple notches and slits in the supply zone 161a to accommodate movement of the cooling means 157. The cutouts 171d in the lower insulating sheet 171 are provided to allow the lower insulating sheet 171 to be removed while avoiding the wiring 154. By providing these cutouts 161d and 171d as appropriate, the upper insulating sheet 161 and the lower insulating sheet 171 can be easily removed. Furthermore, the opening area of ​​the side opening A1 shown in FIG. 3 is minimized, so that the operation of the thermoforming device 100 is not hindered.

[0054] The thermoforming device 100 according to the present invention has been described above, but the present invention is not limited to this, and various modifications are possible without departing from the spirit of the invention. For example, although the thermoforming device 100 of this embodiment is described as using a heater 153 that performs radiant heating, this does not preclude a heating method using a hot plate if necessary.

[0055] S Resin sheet 100 Thermoforming device 150 Heating section 151 Upper heating means 152 Lower heating means 155 Conveying mechanism 161 Upper heat insulating sheet 161a Supply section zone 161b Heating section zone 171 Lower heat insulating sheet 171a Supply section zone 171b Heating section zone 171c Bag-shaped sewing section 200 Forming section

Claims

1. A thermoforming device comprising a heating section having upper heating means for heating a resin sheet from above and lower heating means for heating the resin sheet from below, a molding section for molding the resin sheet, and a conveying mechanism for conveying the resin sheet, wherein heat insulating sheets are detachably fixed to the outer surfaces of the upper heating means and the lower heating means, the heat insulating sheets being formed by sewing a cloth material having heat insulating properties, and including an upper heat insulating sheet located on the upper side divided by the conveying surface of the resin sheet conveyed by the conveying mechanism and fixed to the outer surface of the upper heating means, and a lower heat insulating sheet located below the heating section and fixed to the outer surface of the lower heating means, the upper heat insulating sheet and the lower heat insulating sheet having a heating section zone in contact with the outer surface of the heating section and a supply section zone extending from the heating section zone to the conveying surface side, and the lower heat insulating sheet having pillar sections arranged in parallel at regular intervals and perpendicular to the feeding direction of the resin sheet, and aggregates being passed through the pillar sections, A thermoforming device characterized by:

2. A thermoforming device as claimed in claim 1, characterized in that a heat-resistant magnet is used as a means for fixing the upper and lower heat insulating sheets, and a ferromagnetic metal is used on the outer surface of the housing used in the heating section.

3. A thermoforming device as claimed in claim 1 or claim 2, wherein the shielding plate provided in the heating section has a water channel formed therein and is provided with piping connected to the water channel, and is provided with electrical wiring connected to the heating section, and the upper heat insulating sheet or the lower heat insulating sheet is provided with a slit section to avoid the piping or electrical wiring.

4. A heat insulating sheet attached to the side of a heating section of a thermoforming machine equipped with a heating section that heats a resin sheet, the heat insulating sheet comprising an upper heat insulating sheet arranged above the heating section and a lower heat insulating sheet arranged below the heating section, the upper and lower heat insulating sheets using silicone coated glass cloth as outer skins and glass wool as inner heat insulating material, a heating section zone in contact with the thermoforming machine and a supply section zone extending from the heating section, the heating section zone and the supply section zone being separated by a sewing section sewn together with heat resistant thread, cut sections being provided corresponding to the protrusions of the heating section, and the lower heat insulating sheet being provided with bag sections into which supports are inserted at regular intervals.

5. A heat insulating sheet according to claim 4, characterized in that the upper heat insulating sheet and the lower heat insulating sheet are fixed to the thermoforming machine using heat-resistant magnets.

6. A heat insulating sheet attached to the side of a heater hot plate in a vacuum or pressure forming machine, characterized in that it is 5mm to 20mm thick and has a hot plate zone and a supply zone, the supply zone being formed to fit the shape of protrusions such as rail wiring on the vacuum or pressure forming machine, and the lower heat insulating sheet attached to the bottom of the heater hot plate has a support that allows it to stand on its own.

7. The heat insulating sheet according to claim 6, characterized in that a slit is provided so that the heat insulating sheet can be attached even if the water jacket is movable.

8. The heat insulating sheet according to claim 6 or 7, characterized in that a heat-resistant magnet is provided.

Images