Flanging device and flanging method

Abstract

This invention discloses a folding device and method for folding adhesive bodies, comprising: a base providing support; a folding assembly including a fixed part and a movable part disposed opposite to each other, the fixed part and the movable part forming a molding groove together; an upper mold disposed above the molding groove and movable in the vertical direction for carrying the adhesive body downward and pressing it into the molding groove; and a lower mold movable in the vertical direction along the molding groove to clamp the adhesive body together with the upper mold in the vertical direction; wherein the movable part is movable in the horizontal direction so that when the movable part moves to the left, the face paper corresponding to the movable part of the adhesive body in the molding groove is bonded to the gray board. This invention eliminates the need for auxiliary positioning and pressing devices, reducing space occupation, and the face paper to be folded is bonded to the gray board by moving the movable part to the left, and is applicable to frame face paper requiring full coverage and half coverage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carton processing, in particular to a folding device and a folding method. BACKGROUND

[0002] A carton is a packaging box for containing small cigarette boxes. The carton includes a leather shell and a frame. The frame often serves as the main support in the carton box type and includes a gray board and a face paper. In the existing frame production process, the face paper is first pasted with glue on the upper surface by a pasting machine, and then is moved to a positioning station by a conveying belt to paste a long gray board to form an adhesive body. According to this scheme, the face paper to be folded outside the gray board needs to be folded and pasted with the gray board in the subsequent process. The folding requirements of the face paper of the frame in different box types are different. Some require the face paper to be folded to completely cover the gray board, and some require the face paper to be folded to half cover the gray board, and the edge of the gray board and the face paper are required to have no gap.

[0003] The existing folding technology is to stretch the face paper to be folded out of the platform after positioning the adhesive body on the platform, and then press the adhesive body. A shovel is arranged on the side of the platform, which is first vertically raised to fold the stretched face paper vertically, and then moves to the top surface of the gray board to fold the face paper horizontally. Since the face paper has glue on it, the face paper will be pasted to the upper surface of the gray board. However, this scheme uses a pressing mechanical structure to press the adhesive body from above, which occupies the space above the adhesive body. If the part to be folded of the face paper is large or fully covers, this scheme cannot be used. Moreover, the device using this scheme has many mechanical parts such as positioning structure and pressing structure, which also makes the adhesive body material need to pass through multiple stations for positioning, pressing and folding, which leads to the whole device occupying too much space. Not only does it increase the cost of mechanical equipment, but also increases the marginal cost of using the equipment. Therefore, the inventor needs to improve this scheme. SUMMARY

[0004] The main purpose of the present application is to provide a folding device to replace the traditional folding scheme, thereby solving the problem that the traditional folding device is not suitable for fully covering the face paper to be folded, which has a small range of application, and reducing the number of stations and steps required by the process method, thereby designing a device with higher integration and smaller footprint to realize the process.

[0005] To achieve the above purpose, the present application provides a folding device for folding an adhesive body, comprising:

[0006] A folding device for folding an adhesive body, comprising:

[0007] A base provides support;

[0008] The folding device comprises a fixed part and a movable part arranged oppositely, and a forming groove is formed between the fixed part and the movable part.

[0009] An upper die is arranged above the forming groove and is arranged movably along the vertical direction, and is used to carry the adhesive body to be pressed into the forming groove;

[0010] A lower die is arranged movably along the vertical direction of the forming groove, and is used to hold the adhesive body in the forming groove together with the upper die;

[0011] The movable part is arranged movably along the horizontal direction, and when the movable part moves to the left, the paper on the surface of the adhesive body in the forming groove corresponding to the movable part is adhered to the gray board.

[0012] Further, the upper surface of the lower die is provided with a suction hole, and the suction hole is used to form a negative pressure under the action of a vacuum generating device to adsorb and fix the adhesive body.

[0013] Further, the lower surface of the upper die is provided with a suction hole, and the suction hole is used to form a negative pressure under the action of a vacuum generating device to adsorb and fix the adhesive body.

[0014] Further, the left and right side surfaces of the upper die are inclined from bottom to top.

[0015] Further, a part of the movable part is provided with a notch, and the notch corresponds to the part of the gray board of the adhesive body without paper covering.

[0016] Further, the folding device further comprises two air blowing parts, and the two air blowing parts are arranged outside the forming groove to blow air upward before the upper die presses the adhesive body into the forming groove, so that the paper on the left and right sides of the adhesive body is raised upward.

[0017] Further, the inner side wall of the fixed part and / or the movable part is inclined outward from bottom to top.

[0018] Further, the movable part comprises a shovel installed on the base and a driving assembly for driving the shovel to move reciprocally.

[0019] A folding method using any of the folding devices described above comprises the following steps:

[0020] The upper die carries the adhesive body to move to the lower die, and the adhesive body is in contact with the lower die; the upper die and the lower die hold the adhesive body into the forming groove to fold the paper on the two sides of the adhesive body upward;

[0021] When the upper surface of the adhesive body is flush with the lower surface of the movable part, the adhesive body stops;

[0022] Moving the upper mold upward to separate from the adhesive body;

[0023] Moving the movable part to the fixed part to fold the to-be-folded edge surface paper on one side of the movable part until the to-be-folded edge surface paper is adhered to the upper surface of the adhesive body.

[0024] Further, after the to-be-folded edge surface paper is adhered to the upper surface of the adhesive body, the movable part waits to be stationary, and the lower mold is lifted upward to extrude the adhesive body to remove bubbles.

[0025] In the technical solution of the present application, the forming groove is formed by the edge folding assembly, the adhesive body is pressed into the forming groove when the upper mold moves downward, the to-be-folded edge surface paper in the adhesive body is pre-folded, then the upper mold is separated from the adhesive body to release the space above the adhesive body, the adhesive body is supported and fixed by the lower mold, and the surface paper in the adhesive body corresponding to the movable part is adhered to the gray board when the movable part moves to the fixed part to fold the edge. The edge folding device does not need auxiliary positioning device and pressing device, greatly reducing the number of mechanical structures and the number of workstations and the floor area; and when the space above the adhesive body is released, the to-be-folded edge surface paper is adhered to the gray board by moving the movable part to the fixed part, even when the processing demand of full-coverage surface paper is met, the movable part can push the surface paper to the fixed part completely to make the to-be-processed surface of the gray board realize full coverage, and the processing range of the frame edge folding process is expanded from a single range of half-coverage to both half-coverage and full-coverage. Furthermore, the to-be-folded surface paper is pre-folded to a generally vertical state by the forming groove and then adhered to the upper surface of the gray board by the movable part, so that there is no gap at the folding position of the to-be-folded surface paper corresponding to the gray board, because the gap between the surface paper and the side wall of the gray board is extruded once by the pre-folding of the groove, and the gap between the surface paper and the gray board is further reduced by the second pulling of the surface paper by the movable part. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to the structures shown in these drawings without creative labor for those skilled in the art.

[0027] Figure 1 A schematic diagram of a half-coverage to-be-folded edge adhesive body provided by the embodiment of the present application;

[0028] Figure 2 A schematic diagram of a half-coverage to-be-folded edge adhesive body before entering the forming groove provided by the embodiment of the present application;

[0029] Figure 3 A schematic diagram of a half-coverage to-be-folded edge adhesive body before entering the forming groove provided by the embodiment of the present application; Figure 2 A schematic diagram of a half-coverage to-be-folded edge adhesive body before entering the forming groove provided by the embodiment of the present application;

[0030] Figure 4 is Figure 3 the state schematic view of the left shift of the movable part in

[0031] Figure 5 the state schematic view of the full coverage of the edge folding surface to be folded of the embodiment of the present application;

[0032] Figure 6 is Figure 5 the state schematic view of the left shift of the movable part in

[0033] Figure 7 is Figure 6 the enlarged schematic view of the A part in

[0034] Figure 8 the three-dimensional structure schematic view of the embodiment of the edge folding device provided by the present application;

[0035] Explanation of the reference signs:

[0036]

[0037]

[0038] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative work under the premise that the specific working conditions are changed, should belong to the protection scope of the present application.

[0040] It should be noted that if the directionality indication (such as up, down, left, right, front, back, etc.) is involved in the embodiments of the present application, the directionality indication is only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings). If the specific posture is changed, the directionality indication will also be changed accordingly.

[0041] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0042] Carton boxes are a common type of cardboard box. They consist of a casing and a frame, with the frame often serving as the main support. The frame includes a backing board and a facing paper. In existing frame production processes, the facing paper is first glued to its upper surface using a gluing machine, and then conveyed to a positioning station to adhere the backing board, forming an adhesive. According to this process, subsequent steps require folding the facing paper outside the backing board within this adhesive structure and then gluing it to the backing board. Different box types have different requirements for folding the facing paper; some require the facing paper to fully cover the backing board, while others require it to partially cover it (e.g.,...). Figure 1 As shown in the figure, the uniform requirement is that there should be no gap between the edge of the gray board and the face paper.

[0043] Existing folding technology involves positioning the adhesive on a platform, extending the paper to be folded beyond the platform, pressing the adhesive together, and using a scraper on the side of the platform. The scraper first rises vertically to fold the extended paper vertically, and when it reaches the top surface of the gray board, it moves back down to level the paper. Because the paper has adhesive, it adheres to the upper surface of the gray board. However, this method uses a pressing mechanism to press the adhesive from above, which occupies the space above the adhesive material. If the portion of the paper to be folded is large or completely covers the material, this method is not suitable. Furthermore, current devices using this method have many mechanical components such as positioning and pressing structures, requiring the adhesive material to be positioned, pressed, and folded at multiple stations, resulting in an excessively large footprint for the entire device. This increases both the cost of the equipment and the marginal cost of using it.

[0044] In view of this, the present invention provides a method for processing such as Figure 1 The folding device for the adhesive body in the state shown.

[0045] Adhesive 200 structure as follows Figure 1As shown, the adhesive body 200 includes a gray board 220 and a face paper 210, the gray board 220 is pasted on the upper middle part of the face paper 210, wherein the width of the gray board 220 is less than the width of the face paper 210, the middle part of the face paper 210 is pasted on the lower surface of the gray board, and the face paper 240 to be folded on one side of the gray board 220, the purpose of the folding device 100 in the present application is to complete the folding of the face paper 240 to be folded on one side and paste it on the upper surface of the gray board 220. According to the box making route of the frame box type, the length of the gray board 220 is greater than the length of the face paper 210, so that a part of the length of the gray board 220 in the adhesive body 200 is not pasted by the face paper 210, this part is the exposed section 230, which is left for the next step of the additional pasting of the face paper in the frame forming process.

[0046] As shown in the half-coverage folding requirement of the adhesive body, Figure 1 As shown in the half-coverage folding requirement of the adhesive body, refer to Figures 2 to 4 The folding device 100 includes a base, a folding assembly 1, an upper die 2 and a lower die 3, the folding assembly 1 includes a fixed part 11 and a movable part 12 arranged on the left and right sides of the folding area 5, and the fixed part 11 and the movable part 12 jointly form a forming groove 13; the upper die 2 is arranged above the forming groove 13 and is movably arranged in the up-down direction to press the adhesive body 200 downward into the forming groove 13 when the upper die 2 is moved downward to be close to the forming groove; the lower die 3 is arranged between the fixed part 11 and the movable part 13 and is movably arranged in the up-down direction to form the movable bottom surface of the forming groove and support the adhesive body 200 at the folding area 5 upward; wherein the movable part 12 is movably arranged in the left-right direction to paste the face paper 240 to be folded corresponding to the movable part 12 in the adhesive body 200 in the forming groove 13 to the gray board 220.

[0047] The forming groove 13 is formed by the folding assembly 1, and when the upper die 2 is moved downward to press the adhesive body 200 into the forming groove 13, the face paper 240 to be folded in the adhesive body 200 can be pre-folded, then the upper die 2 is moved upward to be away from the adhesive body 200, the adhesive body 200 is fixed by the lower die 3, and when the movable part 12 is moved leftward, the face paper 240 to be folded corresponding to the movable part 12 in the adhesive body 200 is pasted to the gray board 220, the folding device 100 does not need auxiliary positioning device and pressing device, greatly reducing the occupied space, and the face paper 240 to be folded is pasted to the gray board 220 by moving the movable part 12 leftward, which is suitable for the frame face paper 210 with full-coverage and half-coverage requirements, as shown in Figures 4 to 7 It is worth noting that the lower surface of the upper die 2 and the upper surface of the lower die 3 are respectively matched with the width of the gray board 220 in the adhesive body 200, and the width of the forming groove 13 is also matched with the width of the gray board 220.

[0048] The lower die 3 supports the adhesive body 200 upwardly, the upper die 2 presses the adhesive body 200 downwardly, the upper die 2 and the lower die 3 jointly move downwardly, the pressing force of the upper die 2 is greater than the supporting force of the lower die 3, so that the adhesive body 200 moves downwardly and keeps floating under the joint action of the upper die 2 and the lower die 3, thereby ensuring the posture of the adhesive body 200 stable during the molding process, and better molding quality is obtained.

[0049] Further, the upper surface of the lower die 3 and the lower surface of the upper die 2 are provided with suction holes, which are used to form negative pressure under the action of a vacuum device, so as to adsorb and fix the adhesive body 200.

[0050] The upper die sucks the adhesive body 200 from the work station of the previous step, the suction holes in the upper die adsorb the adhesive body 200 from the upper surface of the gray plate 220 and transfer the material to above the molding groove 13, before entering the molding groove 13, the adhesive body 200 is first clamped by the lower die 3, and then jointly descends along the molding groove 13, when the upper surface of the descending gray plate 220 is flush with the lower surface of the movable part 12, the vacuum generator of the upper die 2 is turned off, the negative pressure is lost, the upper die is demolded from the molding groove 13, the negative pressure in the lower die 3 is kept, and the adhesive body 200 material is fixed from the bottom. In this way, the space above the gray plate 220 (and the space above the molding groove) is completely released before the movable part 12 moves. Further, as shown in Figures 2-3 The left and right side surfaces of the upper die 2 are inclined from bottom to top in a direction of approaching each other. Because the upper part of the flange paper 240 on the left and right sides of the adhesive body 200 is coated with glue, in order to avoid the glue being pasted on the upper die 2, the left and right side surfaces of the upper die 2 are inclined from bottom to top in a direction of approaching each other. The flange paper 210 coated with glue will be warped and when the adhesive body 200 enters the molding groove 13 and is pre-folded upwardly, the left and right side surfaces of the upper die 2 being inclined from bottom to top in a direction of approaching each other helps to avoid the flange paper 210 being pasted on the left and right side surfaces of the upper die 2.

[0051] Further, as shown in Figure 2 The flange device 100 further comprises two air blowing parts 4, which are arranged on both sides of the fixed part 11 and the movable part 12 as a whole, so as to blow air upwardly during the process that the upper die 2 presses the adhesive body 200 downwardly into the molding groove 13, so that the flange paper 210 on the left and right sides of the adhesive body 200 is raised upwardly.

[0052] Because the face paper 210 is coated with glue, the face paper 210 is infiltrated by the glue, and the two sides of the adhesive body 200 are prone to curling deformation under the action of the glue. The two sides of the face paper 210 are blown upward by the two blowing parts 4 to prevent the face paper 210 from being excessively deformed and curled and adhered to the fixed part 11 and / or the movable part 12 on the two sides when the adhesive body 200 enters the forming groove 13. Here, the blowing part can be arranged on the upper side of the fixed part 11 and the movable part 12, or on the side away from each other.

[0053] Similarly, the technical means equivalent to the present technical means is to arrange an air suction part on the two sides of the upper die 2, which is well known to those skilled in the art.

[0054] Further, the fixed part 11 and the movable part 12 have an inner side wall 14, and the upper half of the inner side wall 14 is arranged to be inclined from bottom to top to the outside of the forming groove to form a V-shaped flared structure. By arranging the V-shaped flared structure, on the one hand, it helps to guide the position when the adhesive body 200 enters the forming groove 13, and on the other hand, if the position is deviated by an error when the adhesive body 200 enters the forming groove 13, the inclined inner side wall 14 can work together with the upper die 2 to guide and correct the deviation when passing through the V-shaped flared part of the forming groove 13.

[0055] It is worth noting that in another embodiment, the inner side wall 14 of the fixed part 11 is arranged to be inclined from bottom to top to the outside of the forming groove as a whole, which is to cope with the processing scheme of full coverage of the face paper. As shown in Figures 5-7 , at this time, the width of the face paper 210 to be folded is greater than the width of the gray board 220, and after the face paper is folded, the process requires the face paper 210 to be folded to cover the gray board 220 and adhere to the opposite side of the face paper. As shown in Figure 5 , during the process of turning the face paper 210 to be folded by 90°, if the opposite side of the face paper is in a vertical state, the top edge of the opposite side of the face paper will be adhered and rolled into the range of the forming groove, forming an overlapping defective product. Therefore, the inner side wall 14 of the fixed part is arranged to be inclined as a whole, and the opposite side of the face paper is first inclined on the left side of the inner side wall, and when the upper surface of the gray board 200 is flush with the lower surface of the movable part 12, the movable part is moved to the left to push the face paper to the opposite side and adhere to the opposite side of the face paper (as shown in Figure 6 and 7 ). Therefore, the left side of the inner side wall is preferably inclined as a whole, and the right side of the inner side wall is preferably inclined as a whole.

[0056] Further, as shown in Figure 8The fixed part 11 is preferably a vertical baffle, and the movable part 12 comprises a shovel and a driving cylinder mounted on the base; the driving cylinder drives the shovel to move left and right.

[0057] By setting the left fixed part 11 as a baffle and the right movable part 12 as a shovel, the inner side surfaces of the baffle and the shovel together form the side wall of the forming groove 13, and the shovel moves left under the driving of the driving cylinder, so that the adhesive body 200 is directly moved left by the shovel after being pre-folded in the forming groove 13, and the right side of the edge-to-be-folded paper 240 is folded left to be pasted and fixed with the gray board 220. This device has simple structure, high utilization rate of the shovel, small occupied space and low cost, and can meet the edge folding requirements of adhesive bodies 200 of various sizes. Here, the cylinder can also be a lead screw, an electric push rod or other driving components.

[0058] Further, in combination with Figure 1 and Figure 8 , according to the current process route of the frame, the gray board 220 comprises four sections, one of which is a bare section 230, and the corresponding part of the movable part 12 is provided with a notch to realize avoidance of the bare section 230, so as to avoid scratching, even offsetting or damaging the material when the movable part is retracted.

[0059] The application also provides an edge folding method using the above edge folding device, which comprises the following steps:

[0060] Step S10: the upper die 2 carries the adhesive body 200 to move towards the lower die 3, and the adhesive body 200 is in contact with the lower die 3; at this time, the upper surface of the lower die 3 is higher than or equal to the top of the edge folding assembly 1.

[0061] Step S20: the upper die 2 and the lower die 3 clamp the adhesive body 200 into the forming groove 13 to fold the edge-to-be-folded paper 240 on both sides of the adhesive body 200 upward; at this time, the upper die 2 and the lower die 3 jointly move downward.

[0062] Before this step, the edge-to-be-folded paper 240 can be blown to make it tilt slightly. In this step, a small step can also be included: if the posture of the adhesive body 200 carried by the upper die 2 is not correct, the adhesive body 200 is corrected by the inner side surfaces of the fixed part and the movable part during the process of entering the forming groove 13.

[0063] Step S30: the upper die 2 and the lower die 3 clamp the upper surface of the gray board 220 in the adhesive body 200 to be flush with the lower surface of the movable part 12.

[0064] Step S40: move the upper die 2 upward to be away from the adhesive body 200; at this time, the lower die 3 adsorbs the lower surface of the adhesive body 200.

[0065] In a specific implementation, the upper die 2 is moved upward to push the to-be-flanged face paper 240 away from the gray board 220 to make room for the subsequent movable part 12, so as to avoid interference between the movable part 12 and the upper die 2, and to avoid the to-be-flanged face paper 240 being pasted on the upper die 2.

[0066] Step S50: moving the movable part 12 to the left until the to-be-flanged face paper 240 corresponding to the movable part 12 in the adhesive body 200 is pasted to the paperboard.

[0067] In a specific implementation, by moving the movable part 12 to the left, the to-be-flanged face paper 240 on the right can be directly folded to be pasted to the gray board 220 under the action of the lower surface of the movable part 12 and the inner side surface of the fixed part.

[0068] After the to-be-flanged face paper 240 is flanged by the movable part 12 moving to the fixed part, the movable part 12 can also be kept in a horizontal position, and the lower die 3 is lifted upward to make the lower die 3 and the movable part jointly extrude the flanged frame to achieve the effect of removing bubbles.

[0069] The above description is only the preferred embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like within the concept of the present application, and the contents of the present application specification and drawings are included in the patent protection scope of the present application.

Claims

1. A folding device for folding the edges of an adhesive body, characterized in that, The utility model relates to a folding edge device for folding the edge of a paper product, comprising: a base for providing support; a folding edge assembly comprising a fixed part and a movable part arranged opposite to each other, the fixed part and the movable part together forming a forming groove; an upper die arranged above the forming groove and movable up and down for carrying the adhesive body to be pressed down into the forming groove; and a lower die movable up and down along the forming groove to hold the adhesive body in the groove together with the upper die; wherein the movable part is movable left and right to adhere the paper on the corresponding side of the movable part to the cardboard in the forming groove when the movable part moves left; the inner side wall of the fixed part and / or the movable part is inclined outward from bottom to top at least in the upper half; the upper surface of the lower die is provided with suction holes for forming negative pressure under the action of a vacuum generating device to adsorb and fix the adhesive body; the folding edge device further comprises two air blowing parts arranged outside the forming groove to blow air upward to make the paper on both sides of the adhesive body curl upward before the adhesive body is pressed down into the forming groove by the upper die; wherein the folding edge process using the folding edge device is as follows: the upper die carries the adhesive body to move towards the lower die and makes the adhesive body contact the lower die; the upper die and the lower die hold the adhesive body into the forming groove to fold the paper on both sides of the adhesive body upward; the upper die is stopped when the upper surface of the adhesive body is flush with the lower surface of the movable part; the upper die is moved upward to be separated from the adhesive body; the movable part is moved towards the fixed part to fold the paper on one side of the movable part until the paper is adhered to the upper surface of the adhesive body; the movable part is kept stationary, and the lower die is lifted upward to press the adhesive body to remove bubbles.

2. The folding apparatus of claim 1, wherein the lower surface of the upper die is provided with suction holes for forming negative pressure under the action of a vacuum generating device to adsorb and fix the adhesive body.

3. The folding apparatus of claim 1 wherein, the left and right sides of the upper die are inclined from bottom to top in a direction of approaching each other.

4. The folding apparatus of claim 1 wherein, the movable part comprises a shovel installed on the base and a driving assembly for driving the shovel to move back and forth.

5. The folding apparatus of claim 1 wherein, a section of the movable part is provided with a notch corresponding to the cardboard part of the adhesive body without paper covering.

6. A method of folding, using the folding apparatus according to any one of claims 1 to 5, characterized in that, the process comprises the following steps: the upper die carries the adhesive body to move towards the lower die and makes the adhesive body contact the lower die; the upper die and the lower die hold the adhesive body into the forming groove to fold the paper on both sides of the adhesive body upward; the upper die is stopped when the upper surface of the adhesive body is flush with the lower surface of the movable part; the upper die is moved upward to be separated from the adhesive body; the movable part is moved towards the fixed part to fold the paper on one side of the movable part until the paper is adhered to the upper surface of the adhesive body.

7. The folding method according to claim 6, characterized in that, the process further comprises the following steps: after the paper is adhered to the upper surface of the adhesive body, the movable part is kept stationary, and the lower die is lifted upward to press the adhesive body to remove bubbles.

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