Lower template for preventing auxiliary material from deviating, vacuum hot-pressing template group and vacuum pressing machine

Abstract

The invention provides a lower die plate capable of preventing auxiliary materials from deviating, a vacuum hot-pressing die plate set and a vacuum pressing machine, the lower die plate comprises a lower hot plate and a burning iron plate, the upper surface of the lower hot plate comprises a middle concave part and a plurality of edge convex parts, and the edge convex parts are located on the outer side of the middle concave part; the burning iron plate is located in the middle concave part, at least one edge convex part is provided with an edge pressing structure, the edge pressing structure comprises a pressing block used for pressing the edge of a release auxiliary material on the top face of the to-be-pressed product, and the pressing block is located on the outer side of the burning iron plate; and the pressing block is elastically and rotationally arranged on the edge convex part. The edge pressing structure is pressed on the edge of the auxiliary material on the top surface of the to-be-pressed product, so that the release auxiliary material on the top surface of the to-be-pressed product is prevented from deviating at the moment of extrusion during mold closing, and meanwhile, the release auxiliary material on the top surface is prevented from being taken out and pulled up along with the upper mold plate to deviate when the mold plate is opened after the pressing operation is completed; and the product yield is further improved. And the grabbing manipulator can accurately and perfectly take out the FPC and the release auxiliary material when automatically grabbing the FPC and the release auxiliary material.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible circuit board lamination, and particularly to a vacuum hot pressing template set and a vacuum laminating device for preventing auxiliary material offset. Background Art

[0002] After an insulating film or a reinforcing auxiliary material is adhered to the surface of the substrate of a flexible printed circuit board (FPC), heating and pressing operations need to be performed by a rapid vacuum laminator, so that the insulating film or the reinforcing auxiliary material can be fully and tightly adhered to the substrate to avoid forming bubbles or other defects and resulting in scrapping.

[0003] During the lamination operation, a layer of release auxiliary material (such as a release film, TPX or glass fiber cloth, etc.) is padded on each of the top surface and the back surface of the product to be laminated (FPC) for release to prevent product adhesion and poor lamination transfer. Currently, all rapid vacuum machines on the market operate in this way. During the lamination operation, due to reasons such as static electricity on the surface of the release auxiliary material, residual air inside, and residual air in the mold cavity, the release auxiliary material on the top surface of the product will be offset during the instant extrusion when the mold is closed. When the offset amount exceeds the effective size range of the product to be laminated, defects such as indentation and transfer of the product to be laminated (FPC) will occur and result in scrapping. Currently, there is no effective method on the market to control and solve this problem.

[0004] Moreover, during automated on-line operation, when the grasping manipulator automatically grasps the FPC and the release auxiliary material, it cannot be accurately and completely taken out due to the offset of the release auxiliary material on the surface of the product to be laminated, resulting in shutdown, line stop, or overlapping lamination of the product to be laminated and resulting in scrapping. Summary of the Invention

[0005] To solve the above technical problems, an embodiment of the present invention provides a lower template for preventing auxiliary material offset. The lower template includes a lower hot plate and a sintered iron plate. The upper surface of the lower hot plate includes a middle concave portion and a plurality of edge convex portions. The plurality of edge convex portions are located outside the middle concave portion. The sintered iron plate is located in the middle concave portion. At least one of the edge convex portions is provided with a pressing edge structure. The pressing edge structure includes a pressing block for pressing on the edge of the release auxiliary material on the top surface of the product to be laminated. The pressing block is located outside the sintered iron plate. The pressing block is elastically rotatably arranged on the edge convex portion.

[0006] Optionally, the middle part of the pressing block is rotatably arranged on the edge convex portion through a mounting shaft. A torsion spring is sleeved on the mounting shaft. The torsion spring includes at least two torsion arms, and the two torsion arms respectively abut against the two end portions of the pressing block.

[0007] Optionally, an installation groove is provided on the upper surface of the edge convex portion, and an installation portion is provided in the middle of the lower surface of the pressing block. The installation portion is rotatably arranged in the installation groove through the installation shaft; the torsion spring is located in the installation groove, and the two torsion arms of the torsion spring respectively abut against the lower surfaces of the two end portions of the pressing block.

[0008] Optionally, first installation holes are respectively provided on two corresponding groove walls of the installation groove. The installation portion includes two spaced convex ears, and the torsion spring is located between the two convex ears; second installation holes are provided on the convex ears, and the installation shaft penetrates through the first installation hole, the torsion spring and the second installation hole.

[0009] Optionally, the installation shaft is installed in the first installation hole through a bushing.

[0010] Optionally, the pressing block is located at the end of the edge convex portion, and the two end portions of the pressing block are arranged along the length direction of the edge convex portion. The two end portions of the pressing block are respectively a first end portion and a second end portion. The first end portion is used to be pressed down to lift the second end portion; the first end portion is closer to the end edge of the edge convex portion than the second end portion; the second end portion is used to press the edge of the auxiliary material.

[0011] Optionally, the second end portion is longer than the first end portion.

[0012] Optionally, a pressing edge structure is respectively arranged at both ends of at least two corresponding outer edge convex portions of the middle concave portion.

[0013] Optionally, a plurality of ejector posts are elastically embedded on at least one of the edge convex portions. In the natural state, the upper end surface of the ejector post protrudes from the edge convex portion.

[0014] Optionally, a plurality of installation blind holes are provided on the upper surface of at least one of the edge convex portions, and the lower end of the ejector post is elastically arranged in the installation blind hole through a spring.

[0015] Optionally, a plurality of the ejector posts are elastically embedded on at least two corresponding outer edge convex portions of the middle concave portion.

[0016] Optionally, the product to be pressed includes a substrate of a printed flexible circuit board, and an insulating film or a reinforcing auxiliary material is adhered and covered on the surface of the substrate; during the pressing operation, a release auxiliary material is padded on the top surface and the bottom surface of the product to be pressed, the edge of the release auxiliary material is located outside the edge of the product to be pressed, the product to be pressed is located on the baking iron plate, and the edge of the release auxiliary material is located on the edge convex portion.

[0017] The second embodiment of the present invention further provides a vacuum hot pressing template set for preventing the offset of the auxiliary material, including an upper template and the lower template described in the above embodiment.

[0018] The third embodiment of the present invention further provides a vacuum laminating machine, including the vacuum hot pressing template group described in the above embodiment.

[0019] Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects:

[0020] In the present invention, the product to be laminated includes a substrate of a printed flexible circuit board FPC, and an insulating film or a reinforcing auxiliary material is adhered and covered on the surface of the substrate. During the lamination operation, release auxiliary materials (such as release film, TPX or glass fiber cloth, etc.) are padded on the top and bottom surfaces of the product to be laminated for release. The size of the release auxiliary material is larger than the size of the product to be laminated, that is, the edge of the release auxiliary material is located outside the edge of the product to be laminated. The product to be laminated is located on the baking iron plate, and the edge of the release auxiliary material is located on the edge convex part. Therefore, in the present invention, the edge of the auxiliary material on the top surface of the product to be laminated is pressed by the edge pressing structure, preventing the release auxiliary material on the top surface of the product to be laminated from shifting during the instant extrusion when the mold is closed, and at the same time preventing the release auxiliary material on the top surface from being pulled out and shifted together with the upper template when the template is opened after the lamination operation is completed, thereby improving the product yield.

[0021] Moreover, the edge of the release auxiliary material on the top surface of the product to be laminated is pressed by the pressing block. Therefore, when the template is opened after the lamination operation is completed, the release auxiliary material on the top surface will not be pulled out and shifted together with the upper template. When the gripping manipulator automatically grips the FPC and the release auxiliary material, it can be accurately and completely taken out.

[0022] Further, when the product to be laminated is laminated, the lower template is opened. In order to facilitate the gripping manipulator to clamp the laminated product and the release auxiliary material, a plurality of ejector pins are elastically embedded on the edge convex part. In the natural state, the upper end surface of the ejector pin protrudes from the edge convex part, that is, the ejector pin pushes up the product by elastic force, so that the product is separated from the surface of the lower template, facilitating the gripping manipulator to clamp.

[0023] Of course, it is not necessary for any product implementing the present invention to achieve all the above advantages at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for describing the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of a vacuum hot pressing template group provided by an embodiment of the present invention;

[0026] Figure 2 Exploded view of the lower template provided by an embodiment of the present invention;

[0027] Figure 3 is Figure 2 an enlarged view of part I in Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned accompanying drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices. The terms "above" and "upper" and any variations thereof are intended to describe the positional relationship and do not represent a direct contact relationship between the described objects.

[0030] Please refer to Figures 1 to 3 , the present invention provides a lower template 2 for preventing the offset of auxiliary materials. The lower template 2 includes a lower hot plate 21 and a sintered iron plate 22. The upper surface of the lower hot plate 21 includes a middle concave portion 212 and a plurality of edge convex portions 211. The plurality of edge convex portions 211 are located outside the middle concave portion 212; the sintered iron plate 22 is located in the middle concave portion 212. At least one of the edge convex portions 211 is provided with a pressing structure 23. The pressing structure 23 includes a pressing block 231 for pressing on the edge of the release auxiliary material on the top surface of the product to be pressed. The pressing block 231 is located outside the sintered iron plate 22; the pressing block 231 is elastically rotatably arranged on the edge convex portion 211.

[0031] In the present invention, the product to be laminated includes a substrate of a printed flexible printed circuit (FPC), and an insulating film or a reinforcing auxiliary material is adhered to the surface of the substrate. During the lamination operation, release auxiliary materials (such as release films, TPX, or fiberglass cloth, etc.) are padded on the top and bottom surfaces of the product to be laminated for release. The size of the release auxiliary material is larger than that of the product to be laminated, that is, the edge of the release auxiliary material is located outside the edge of the product to be laminated. The product to be laminated is located on the baking iron plate 22, and the edge of the release auxiliary material is located on the edge convex portion 211. Therefore, in the present invention, the edge of the auxiliary material on the top surface of the product to be laminated is pressed by the edge pressing structure 23, preventing the release auxiliary material on the top surface of the product to be laminated from shifting during the instant extrusion when the mold is closed, and at the same time preventing the top release auxiliary material from being pulled out and shifted together with the upper template when the template is opened after the lamination operation is completed, thereby improving the product yield.

[0032] Moreover, the edge of the release auxiliary material on the top surface of the product to be laminated is pressed by the pressing block 231. Therefore, when the template is opened after the lamination operation is completed, the top release auxiliary material will not be pulled out and shifted together with the upper template, so that the picking manipulator can accurately and completely pick out the FPC and the release auxiliary material when automatically picking them up.

[0033] In the present invention, the upper surface of the lower hot plate 21 includes a middle concave portion 212 and a plurality of edge convex portions 211. The plurality of edge convex portions 211 are located outside the middle concave portion 212. The present invention does not limit the number of the edge convex portions 211, which can be set according to the shape of the middle concave portion 212. As an embodiment, if the middle concave portion 212 is square, then the middle concave portion 212 has four edges. Therefore, the lower hot plate 21 includes four edge convex portions 211 corresponding to the four edges of the middle concave portion 212. The four edge convex portions 211 protrude from the middle concave portion 212 and surround the middle concave portion 212.

[0034] The pressing block 231 is elastically rotatably arranged on the edge convex portion 211, that is, the pressing block 231 can rotate under the action of an external force, so that one end of the pressing block 231 is lifted, and after the external force is removed, the pressing block 231 is reset by gravity and elasticity. Before the mold is closed, the product to be laminated and the release auxiliary material grabbed by the picking manipulator are placed on the lower template 2, so that the product to be laminated is located on the baking iron plate 22, and the edge of the release auxiliary material is located on the edge convex portion 211. Then, through the operation of the relevant mechanism on the picking manipulator, one end of the pressing block 231 is lifted, and the edge of the release auxiliary material is located below the pressing block 231. Then, the pressing block 231 is released, and the pressing block 231 presses on the release auxiliary material under the action of gravity and elasticity. After the lamination operation is completed, the lower template 2 is opened, and by lifting the end of the pressing block 231 pressing on the release auxiliary material, the laminated product can be clamped and taken away by the picking manipulator.

[0035] The present invention does not limit the structure of how the pressing block 231 is elastically rotated and arranged on the edge convex part 211.

[0036] As a first embodiment, one end of the pressing block 231 is elastically rotated and arranged on the edge convex part 211. For example, if the first end of the pressing block 231 is elastically rotated and arranged on the edge convex platform, then by applying an external force to lift the second end of the pressing block 231, the edge of the release auxiliary material is located below the second end of the pressing block 231, and then the second end of the pressing block 231 is released. The second end of the pressing block 231 presses on the release auxiliary material under the action of gravity and elasticity.

[0037] As a second embodiment, the pressing block 231 is elastically rotated and arranged on the edge convex part 211 through its middle part. By applying an external force, the two ends of the pressing block 231 can rotate up and down like a seesaw. After removing the external force, the pressing block 231 resets under the action of gravity and elasticity. For example, by pressing the first end part of the pressing block 231, the second end part of the pressing block 231 is lifted, so that the edge of the release auxiliary material is located below the second end part of the pressing block 231, and then the first end part of the pressing block 231 is released. The second end part of the pressing block 231 presses on the release auxiliary material under the action of elasticity.

[0038] The following takes the second embodiment as an example and describes it in detail.

[0039] The middle part of the pressing block 231 is rotationally arranged on the edge convex part 211 through a mounting shaft 232. A torsion spring is sleeved on the mounting shaft 232. The torsion spring 233 includes at least two torsion arms 2331, and these two torsion arms 2331 respectively abut against the two end parts of the pressing block 231, that is, the two end parts of the pressing block 231 are elastically supported by the torsion spring 233.

[0040] Specifically, an installation groove 2111 is provided on the upper surface of the edge convex part 211. The torsion spring 233 is located in the installation groove 2111, and first installation holes 21111 are respectively provided on two corresponding groove walls of the installation groove 2111.

[0041] The middle part of the lower surface of the pressing block 231 is provided with an installation part. The installation part includes two spaced convex ears 2311. Second installation holes 23111 are provided on the convex ears 2311. The torsion spring 233 is located between the two convex ears 2311, and the two torsion arms 2331 of the torsion spring 233 respectively abut against the lower surfaces of the two end parts of the pressing block 231.

[0042] The mounting shaft 232 penetrates through the first mounting hole 21111, the torsion spring 233 and the second mounting hole 23111.

[0043] Furthermore, the mounting shaft 232 is installed in the first mounting hole 21111 through a bushing 234.

[0044] Before mold clamping, the product to be pressed and the release auxiliary material grasped by the grasping manipulator are placed on the lower template 2, so that the product to be pressed is located on the sintering iron plate 22, and the edge of the release auxiliary material is located on the edge convex part 211. Then, the ejector pin on the grasping manipulator presses the first end of the pressing block 231 downward, so that the second end of the pressing block 231 is lifted, and the edge of the release auxiliary material is located below the second end of the pressing block 231. Then, the ejector pin on the grasping manipulator releases the first end of the pressing block 231, and the second end of the pressing block 231 presses on the release auxiliary material under the action of gravity and elasticity. After the pressing operation is completed, the lower template 2 is opened, and the ejector pin on the grasping manipulator presses the first end of the pressing block 231 downward, so that the second end of the pressing block 231 is lifted, and the pressed product is clamped and taken away by the grasping manipulator.

[0045] In this embodiment, there is no limitation on the specific position of the pressing block 231 provided on the edge convex part 211, which can be set according to the actual size of the release auxiliary material, and the purpose is to be able to press the edge of the release auxiliary material.

[0046] As an embodiment, the pressing block 231 is located at the end of the edge convex part 211, and the two ends of the pressing block 231 are arranged along the length direction of the edge convex part 211. In this embodiment, the pressing block 231 is divided into two parts in the length direction, that is, two ends. The two ends of the pressing block 231 are respectively the first end and the second end. The first end is used to be pressed downward to lift the second end; the first end is closer to the end edge of the edge convex part 211 than the second end, and the purpose is to make the first end avoid the edge of the auxiliary material, so as to facilitate the ejector pin on the grasping manipulator to press the first end downward.

[0047] The mounting shaft 232 can be located at the middle position of the pressing block 231, or can be more biased towards the first end or the second end. Since the second end is used to press the edge of the auxiliary material, in order to facilitate the second end to more stably press the edge of the auxiliary material, therefore, the mounting shaft 232 is designed to be closer to the first end, that is, the second end is longer than the first end, and the purpose is to make the length of the pressing block 231 pressing the auxiliary material longer.

[0048] The edge pressing structure 23 can be provided on all the edge convex parts 211, or can be provided on some of the edge convex parts 211, and the present invention does not make specific limitations on this.

[0049] To facilitate symmetrically pressing the edges of the auxiliary materials on two corresponding sides of the middle concave portion 212, as an embodiment, a pressing edge structure 23 is respectively provided at both ends of the edge convex portions 211 on at least two corresponding outer sides of the middle concave portion 212. Taking the hinge end where the following template 2 is hinged to the upper template 1 as the rear, and the opening side of the lower template 2 as the front, then a pressing edge structure 23 can be respectively provided at both ends of the two edge convex portions 211 on the left and right sides of the lower template 2. These two edge convex portions 211 are located on the left and right sides of the middle concave portion 212, that is, the left and right sides are two corresponding outer sides of the middle concave portion 212; or / and a pressing edge structure 23 is respectively provided at both ends of the two edge convex portions 211 on the front and rear sides of the lower template 2. These two edge convex portions 211 are located on the front and rear sides of the middle concave portion 212, that is, the front and rear sides are two corresponding outer sides of the middle concave portion 212.

[0050] To not affect the pressing operation after mold closing, in the natural state, the upper surface of the pressing block 231 can be flush with the edge convex portion 211.

[0051] When the product to be pressed is pressed well, open the lower template 2. To facilitate the gripping manipulator to clamp the pressed product and the release auxiliary material, as this embodiment, a plurality of ejector pins 24 are elastically embedded on at least one of the edge convex portions 211. In the natural state, the upper end surface of the ejector pin 24 protrudes from the edge convex portion 211, that is, the ejector pin 24 pushes up the product by elastic force, so that the product is separated from the surface of the lower template 2, facilitating the gripping manipulator to clamp.

[0052] Specifically, a plurality of mounting blind holes 2112 are further provided on the upper surface of at least one of the edge convex portions 211, and the lower end of the ejector pin 24 is elastically arranged in the mounting blind hole 2112 through a spring.

[0053] To not affect the pressing operation after mold closing, under the downward pressure of an external force, the upper end of the ejector pin 24 can retract into the mounting blind hole 2112, or be flush with the edge convex portion 211.

[0054] This embodiment does not limit the elastic connection method between the ejector pin 24 and the mounting blind hole 2112. As an embodiment, the lower end of the ejector pin 24 is elastically arranged in the mounting blind hole 2112 through a spring, that is, one end of the spring is fixedly connected to the lower end of the ejector pin 24, and the other end of the spring is fixedly connected to the bottom of the groove of the mounting blind hole 2112.

[0055] As the second embodiment, a circle of protrusions is provided on the outer circumference of the middle part of the ejector pin 24. The lower end of the ejector pin 24 is sleeved on the spring, the upper end of the spring is fixedly connected to the lower surface of the protrusion, and the lower end of the spring is fixed to the bottom of the groove of the mounting blind hole 2112.

[0056] The top posts 24 may be provided on all the edge convex portions 211, or may be provided on some of the edge convex portions 211. The present invention does not make specific restrictions on this.

[0057] In order to facilitate the symmetrical ejection of the auxiliary material edges on the two corresponding sides of the middle concave portion 212, as an embodiment, a plurality of the top posts 24 are elastically embedded on the edge convex portions 211 at least on the two corresponding outer sides of the middle concave portion 212.

[0058] Taking the hinge end where the following template 2 is hinged to the upper template 1 as the rear, and the opening side of the lower template 2 as the front, then a plurality of top posts 24 may be provided on the two edge convex portions 211 on the left and right sides of the lower template 2. These two edge convex portions 211 are located on the left and right sides of the middle concave portion 212, that is, the left and right sides are the two corresponding outer sides of the middle concave portion 212; and / or a plurality of top posts 24 may be provided on the two edge convex portions 211 on the front and rear sides of the lower template 2. These two edge convex portions 211 are located on the front and rear sides of the middle concave portion 212, that is, the front and rear sides are the two corresponding outer sides of the middle concave portion 212.

[0059] The second embodiment of the present invention further provides a vacuum hot pressing template group for preventing auxiliary material offset, including the upper template 1 and the lower template 2 described in the above embodiment.

[0060] The lower template 2 further includes a jig backing plate 25. The jig backing plate 25 is located in the middle concave portion 212 and below the sintered iron plate 22. The sintered iron plate 22 is also hermetically arranged in the middle concave portion 212 through a sealing ring.

[0061] The third embodiment of the present invention further provides a vacuum laminating machine, including the vacuum hot pressing template group described in the above embodiment.

[0062] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lower template for preventing offset of auxiliary materials, the lower template comprising a lower hot plate and a baking iron plate, characterized in that, The upper surface of the lower hot plate includes a middle concave portion and a plurality of edge convex portions, and the plurality of edge convex portions are located outside the middle concave portion; the baking iron plate is located in the middle concave portion, and a hemming structure is provided on at least one of the edge convex portions. The hemming structure includes a pressing block for pressing on the edge of the release auxiliary material on the top surface of the product to be pressed, and the pressing block is located outside the baking iron plate; the pressing block is elastically rotatably arranged on the edge convex portion.

2. The lower template according to claim 1, characterized in that, The middle part of the pressing block is rotatably arranged on the edge convex portion through a mounting shaft, and a torsion spring is sleeved on the mounting shaft. The torsion spring includes at least two torsion arms, and the two torsion arms respectively abut against the two end portions of the pressing block.

3. The lower template according to claim 2, characterized in that, An installation groove is provided on the upper surface of the edge convex portion, and an installation portion is provided in the middle of the lower surface of the pressing block. The installation portion is rotatably arranged in the installation groove through the mounting shaft; the torsion spring is located in the installation groove, and the two torsion arms of the torsion spring respectively abut against the lower surfaces of the two end portions of the pressing block.

4. The lower template according to claim 3, characterized in that, First mounting holes are respectively provided on two corresponding groove walls of the installation groove. The installation portion includes two spaced convex ears, and the torsion spring is located between the two convex ears; second mounting holes are provided on the convex ears, and the mounting shaft penetrates through the first mounting hole, the torsion spring and the second mounting hole.

5. The lower template according to claim 4, characterized in that, The mounting shaft is installed in the first mounting hole through a bushing.

6. The lower template according to claim 1, wherein The pressing block is located at the end of the edge convex portion, and the two end portions of the pressing block are arranged along the length direction of the edge convex portion. The two end portions of the pressing block are respectively a first end portion and a second end portion. The first end portion is used to be pressed down to lift the second end portion; the first end portion is closer to the end edge of the edge convex portion than the second end portion; the second end portion is used to press the edge of the auxiliary material.

7. The lower template according to claim 6, characterized in that, The second end portion is longer than the first end portion.

8. The lower template according to any one of claims 1 to 7, characterized in that, The hemming structures are respectively arranged at both ends of at least two corresponding outer edge convex portions of the middle concave portion.

9. The lower template according to claim 1, wherein A plurality of ejector pins are elastically embedded on at least one of the edge convex portions. In the natural state, the upper end surface of the ejector pin protrudes from the edge convex portion.

10. The lower template according to claim 9, characterized in that, A plurality of mounting blind holes are provided on the upper surface of at least one of the edge convex portions, and the lower end of the ejector pin is elastically arranged in the mounting blind hole through a spring.

11. The lower template according to claim 9, wherein A plurality of the ejector pins are elastically embedded on at least two corresponding outer edge convex portions of the middle concave portion.

12. The lower template according to claim 1, characterized in that The product to be pressed includes a substrate of a printed flexible circuit board, and an insulating film or a reinforcing auxiliary material is adhered and covered on the surface of the substrate; during the pressing operation, the release auxiliary material is padded on the top surface and the back surface of the product to be pressed respectively. The edge of the release auxiliary material is located outside the edge of the product to be pressed. The product to be pressed is located on the baking iron plate, and the edge of the release auxiliary material is located on the edge convex portion.

13. A vacuum hot pressing template set for preventing auxiliary material offset, characterized in that, It includes an upper template and a lower template according to any one of claims 1 to 12.

14. A vacuum laminating machine, characterized in that, It includes a vacuum hot pressing template group according to claim 13.

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