Manufacturing process of protective shell of full-wrapping veneer folding machine

Abstract

The invention discloses a manufacturing process of a full-wrapping veneer folding machine protective shell. The manufacturing process comprises the following steps: S1, providing the folding machine protective shell and a PU leather finished product which is profiled with the folding machine protective shell; the production method of the profiling PU leather finished product of the folding machine protective shell comprises the following steps: a fitting step: placing a first-stage semi-finished product in a positioning mold, then pre-fitting the PU leather finished product corresponding to the position of the first-stage semi-finished product, then carrying out secondary hot pressing and primary cold pressing, and then sequentially carrying out exhausting, hot pressing and cold pressing to obtain the PU leather finished product. The manufacturing method comprises the following steps: pre-pasting a position, corresponding to the folding machine protective shell, of a profiling PU leather finished product of the folding machine protective shell through manufacturing and design of the profiling PU leather finished product of the folding machine protective shell, then carrying out secondary hot pressing and primary cold pressing, and then carrying out exhausting, hot pressing and cold pressing in sequence, so as to manufacture the full-wrapping veneer folding machine protective shell. Therefore, the protective shell of the folding machine adopts a piece of PU leather finished product with profiling design to be attached and connected into a whole, and the process corners are not wrinkled.

Description

Technical Field

[0001] The present invention relates to the technology in the field of electronic device accessories, and in particular to a manufacturing process for a fully enclosed leather-covered folding machine protective case. Background Art

[0002] The folding mobile phone is an innovative design of a smart phone. Through the foldable screen technology, it can achieve a larger display area while maintaining portability. Compared with traditional straight mobile phones, the folding mobile phone provides a wider range of usage scenarios. For example, it can perform multitasking and watch videos in the unfolded state, or be easily carried in the folded state. The emergence of folding mobile phones has greatly improved the practicality and user experience of mobile devices, so it is more and more favored by consumers in the market;

[0003] Currently, in the field of folding mobile phone cases, the folding mobile phone case is an accessory for protecting or decorating the appearance of the mobile phone. At present, the folding mobile phone cases mainly include plastic types, plastic cases with leather pasted, metal types, wood, etc. Among them, the plastic mobile phone cases are the most common on the market because of their simple technology, low price, and high fitting degree. However, the plastic mobile phone cases lack attraction for high-end mobile phones and high-end users. Covering the outer layer of the plastic mobile phone case with a leather layer can make the mobile phone case more beautiful, generous, and increase the leather feel.

[0004] In the published patent document CN208337662U, a new type of fully enclosed edge-pasted leather mobile phone case, a mobile phone case is disclosed, and its outer layer is covered with a fully enclosed edge-pasted leather. In this fully enclosed edge-pasted leather, the four-corner arc surfaces of the original mobile phone case are not covered. After pasting the leather, wrinkles will occur at the corners, affecting the overall beauty of the mobile phone case.

[0005] Therefore, it is necessary to study a new technical solution to solve the above problems. Summary of the Invention

[0006] In view of this, in view of the deficiencies in the existing technology, the main purpose of the present invention is to provide a manufacturing process for a fully enclosed leather-covered folding machine protective case. Through the production design of a PU leather material product that imitates the folding machine protective case, the PU leather material product that imitates the folding machine protective case is pre-pasted at the position corresponding to the folding machine protective case, and then secondary hot pressing and primary cold pressing are carried out, and then exhaust-heat pressing-cold pressing are carried out in sequence to make a fully enclosed leather-covered folding machine protective case. In this way, the folding machine protective case is integrally formed by fitting and connecting a PU leather material product with a contour design, the corners of the process do not wrinkle, and the operation process is simple, improving the production efficiency.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A manufacturing process for a fully enclosed leather-covered folding machine protective case includes a preparation step S1: providing a folding machine protective case and a PU leather material product that imitates the folding machine protective case;

[0009] The folding machine protective case comprises an upper shell and a lower shell, each of which has an inner ring side and an outer ring side arranged opposite to each other, and a treatment agent is applied on the inner and outer surfaces of the upper shell and the lower shell to obtain a first-stage semi-finished product; the steps for making the PU leather finished product of the folding machine protective case are as follows:

[0010] Step S11, cutting the PU sheet according to the size of the folding machine protective case, applying hot melt adhesive to the top surface of the cut PU sheet for the first time and covering it with a first release paper, and performing a first lamination and hot pressing on it. After the lamination and hot pressing are completed, the first release paper is removed and the top surface of the PU sheet is applied with hot melt adhesive for the second time and covered with a second release paper, and performing a second lamination and hot pressing on it. After the lamination and hot pressing are completed, the second release paper is removed to obtain a second-stage semi-finished product;

[0011] Step S12, covering the bottom surface of the second-stage semi-finished product with a removable PET film to obtain a third-stage semi-finished product;

[0012] Step S13, covering the bottom end surface of the third-stage semi-finished product with silicone and performing hot pressing molding on the surface of the silicone to obtain a fourth-stage semi-finished product that is shaped like a protective case of a folding device;

[0013] Step S14, cutting the periphery of the semi-finished product of the fourth stage, removing the silicone piece from the semi-finished product of the fourth stage, so as to obtain a PU leather finished product that is shaped like the protective case of the folding device;

[0014] Laminating steps: Place the semi-finished product of the first stage in the positioning mold, then pre-laminate the PU leather finished product corresponding to the position of the semi-finished product of the first stage, then perform secondary hot pressing and primary cold pressing, and then perform exhaust-hot pressing-cold pressing in sequence to make a fully covered leather folding machine protective case.

[0015] As a preferred solution, in the laminating step, exhaust is performed after pre-lamination is completed to obtain a fifth-stage semi-finished product, and then the fifth-stage semi-finished product is subjected to secondary hot pressing and once cold pressing to obtain a sixth-stage semi-finished product, and then exhaust-hot pressing-cold pressing is performed in sequence to produce a fully covered skin-laminated folding machine protective case, so that the hot melt adhesive and the folding machine protective case are quickly solidified and the molding stability of the PU leather finished product that imitates the shape of the folding machine protective case is improved, thereby increasing the firmness of the adhesion.

[0016] As a preferred solution, in step S11, the first release paper is removed and then allowed to stand for the first time. After the standing still is completed, the top surface of the PU sheet is coated with hot melt adhesive for the second time; the second release paper is removed and then allowed to stand for the second time to obtain a second-stage semi-finished product.

[0017] As a preferred solution, in step S14, the semi-finished product in the fourth stage at least includes a back plate, a frame, a first extension part, and a second extension part. The back plate has an upper covering part, a lower covering part, and an extension part. The upper covering part is connected to the lower covering part through the extension part. The frame extends from the edge of the back plate towards the bottom end to enclose a chamber. The first extension part extends from the outer edge of the frame, and the second extension part extends from the outside of the first extension part.

[0018] When performing the first cutting on the semi-finished product in the fourth stage, first cut and correct the extension part. Place the semi-finished product in the fourth stage in the cutting device. Then, cover a PC board on the back plate. Use the cutting device to perform the first cutting on the first extension part. After the first cutting is completed, let it stand. After standing, perform the second cutting. Place the semi-finished product after the first cutting in the side cutting device. Press a lower pressing block at the extension part. Use the side cutting device to perform side cutting on the second extension part. After side cutting is completed, remove the lower pressing block. After the second cutting is completed, move out the silica gel part and perform corner treatment simultaneously to obtain a PU sheet.

[0019] As a preferred solution, the cutting device includes a base, a positioning die set on the base, and a cutting mechanism.

[0020] The positioning die set at least includes an upper template and a lower template arranged opposite to each other up and down. A positioning block is arranged on the lower template. A forming cavity is recessed on the lower end surface of the upper template. The upper template is arranged above the lower template in a vertically movable manner.

[0021] The cutting mechanism at least includes a first cutting assembly and a second cutting assembly arranged on the periphery of the positioning block. The first cutting assembly at least includes a first abutting block, a first cutting knife, and a first driving device. The first cutting knife is arranged on the first abutting block. The first driving device is respectively connected to the first abutting block and the first cutting knife. The first driving device drives the first cutting knife and the first abutting block to reciprocate left and right. A first vertical groove is recessed on the outer side wall of the first abutting block, and a second vertical groove is arranged on the side wall of the second abutting block close to the first abutting groove.

[0022] The second cutting assembly at least includes a second abutting block, a second cutting knife, and a second driving device. The second cutting knife is movably arranged on the second abutting block. The second abutting block is located beside the first abutting block. The second driving device is connected to the second cutting knife. The second driving device drives the second cutting knife to reciprocate left and right.

[0023] A mounting groove is further recessed between the first abutting block and the second abutting block, and a limiting block is arranged in the mounting groove; the limiting block includes a main body portion, a first limiting portion for cooperating with the first vertical groove, and a second limiting portion for cooperating with the second vertical groove; a driving rod is further arranged on the lower end surface of the upper template corresponding to the position directly above the limiting block. The limiting block can move between a locking position and an unlocking position relative to the mounting groove. When the limiting block is in the locking position, the first limiting portion and the second limiting portion are respectively located in the first vertical groove and the second vertical groove; when the limiting block is in the unlocking position, the first limiting portion and the second limiting portion are respectively disengaged from the first vertical groove and the second vertical groove. In this way, the first pre-positioning of the product to be cut is formed; secondly, before cutting, the first abutting block and the second abutting block form the second pre-pressing positioning of the product to be cut and perform cutting, so that accurate positioning can be realized, ensuring that when cutting the mobile phone case, the cutting knife can be accurately cut in place, improving the product quality and production efficiency; finally, due to the design of the limiting block, it can prevent the first abutting block and the second abutting block from loosening, which may affect the positioning and cutting deviation and thus affect the cutting quality of the product.

[0024] As a preferred solution, a pull rod is further arranged on one side of the positioning block close to the first abutting block, and one end of the pull rod is connected to the first abutting block; a first positioning groove is arranged on the outer side of the first abutting block, and a second positioning groove is arranged on the outer side of the first cutting knife. The first positioning groove and the second positioning groove are arranged in a vertically penetrating manner to form a matching groove; the first cutting assembly further includes a first pushing block. A matching portion is arranged on one side of the first pushing block close to the matching groove. The first pushing block is respectively connected to the first abutting block and the first cutting knife, and the matching portion is adapted to the matching groove.

[0025] As a preferred solution, a first sliding groove is further arranged beside the molding cavity; a second sliding groove is arranged on the upper surface of the second abutting block; the second cutting assembly further includes a second pushing block. The upper and lower surfaces of the second pushing block are respectively provided with a first sliding portion slidably matched with the first sliding groove and a second sliding portion for slidably matching with the second sliding groove. The output end of the second driving device is connected to the second pushing block. The second pushing block is respectively slidably connected to the upper template and the second abutting block, so that the first sliding portion and the second sliding portion are respectively slidably connected to the first sliding groove and the second sliding groove.

[0026] As a preferred solution, in step S12, first, apply hot melt adhesive to the bottom surface of the second-stage semi-finished product after correction, then cover the PET film on the bottom surface, and perform laminating and hot pressing through a double-head hot press so that the PET film is formed on the bottom surface of the second-stage semi-finished product. Among them, the surface temperature of the upper die of the double-head hot press is 140 ± 30 °C, the die temperature is 110 ± 20 °C, the upper die assembly moves upward for 2 s, moves downward for 2 s, presses for 4 ± 2 s, and increases the pressure for 4 ± 2 s with a pressure of 0.5 ± 0.1 mpa.

[0027] As a preferred solution, in the laminating step, first place the first-stage semi-finished product in a positioning mold for pre-laminating. After pre-laminating, laminate and press the PU leather material corresponding to the position of the first-stage semi-finished product. Stabilize the PU leather material through a heating element so that the PU leather material tightly adheres to the first-stage semi-finished product. After tightly adhering, obliquely pierce the positions with bubbles and protrusions, and then use the heating element to exhaust the bubbles towards the obliquely pierced places to obtain the fifth-stage semi-finished product.

[0028] As a preferred solution, in the laminating step, first place the fifth-stage semi-finished product in a hot press. First, perform the first hot pressing on the back plate and the frame, and the total hot pressing time is 20 ± 4 s. After the first hot pressing is completed, perform hot pressing on the back plate, the frame, and the four corner positions. After the second hot pressing is completed, perform cold pressing on the back plate, the frame, and the four corner positions to obtain the sixth-stage semi-finished product. Then, through exhaust-heat pressing-cold pressing, an all-round leather-covered folding machine protective case is manufactured.

[0029] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solutions, it mainly designs the process of the PU leather finished product imitating the folding machine protective case, cuts the PU sheet according to the size of the folding machine protective case, applies the first hot melt adhesive on the top surface of the cut PU sheet and covers the first release paper, and performs the first laminating and hot pressing on it, so that the hot melt adhesive better penetrates into the material bottom and makes the adhesion between the hot melt adhesive and the PU sheet stronger;

[0030] Next, after the laminating and hot pressing is completed, remove the first release paper and then apply the second hot melt adhesive on the top surface of the PU sheet and cover the second release paper, and perform the second laminating and hot pressing on it. In this way, while increasing the amount of glue, it can fully contact and infiltrate the top surface of the PU sheet, further improving the firm adhesion between the hot melt adhesive and the folding machine protective case;

[0031] Secondly, a layer of removable PET film is laid on the bottom surface of the second-stage semi-finished product to obtain the third-stage semi-finished product. Cover silica gel on the bottom end surface of the third-stage semi-finished product and perform hot pressing and forming on the surface of the silica gel to obtain the fourth-stage semi-finished product imitating the folding machine protective case. In this way, after the PU sheet is hot pressed and formed, the design of the PET film and silica gel is used to fix the forming effect of the plasticized PU sheet and it is not easy to deform;

[0032] Finally, place the semi-finished product of the first stage in the positioning mold, then pre-paste the finished PU leather material corresponding to the position of the semi-finished product of the first stage, and then perform secondary hot pressing and primary cold pressing. Then, successively go through exhaust - hot pressing - cold pressing to make a fully wrapped leather folding machine protective case. In this way, the folding machine protective case is formed by bonding and connecting a finished PU leather material with a profiling design into one body. The process corners do not wrinkle, and the operation process is simple, improving production efficiency.

[0033] To more clearly elaborate on the structural features and functions of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Description of the Drawings

[0034] Figure 1 is a perspective view of an embodiment of the present invention;

[0035] Figure 2 is a cross-sectional view of an embodiment of the present invention;

[0036] Figure 3 is an exploded view of an embodiment of the present invention;

[0037] Figure 4 is a diagram showing the state change during the production process of the finished PU leather material of an embodiment of the present invention;

[0038] Figure 5 is a structural diagram (uncut) of the finished PU leather material of an embodiment of the present invention;

[0039] Figure 6 is another exploded view of an embodiment of the present invention;

[0040] Figure 7 is a perspective view of the cutting mechanism of an embodiment of the present invention (limiting block locked state);

[0041] Figure 8 is another perspective view of the cutting mechanism of an embodiment of the present invention (limiting block unlocked state);

[0042] Figure 9 is a cross-sectional view of the cutting mechanism of an embodiment of the present invention;

[0043] Figure 10 is another cross-sectional view of the cutting mechanism of an embodiment of the present invention;

[0044] Figure 11 is an exploded view of the cutting mechanism of an embodiment of the present invention;

[0045] Figure 12 is another exploded view of the cutting mechanism of an embodiment of the present invention;

[0046] Figure 13 is yet another exploded view of the cutting mechanism of an embodiment of the present invention;

[0047] Figure 14 These are the manufacturing steps of the finished PU leather material that imitates the protective case of the folding machine in the embodiments of the present invention. Specific embodiments

[0048] Please refer to Figures 1 to 14 as shown, which shows the specific structure of the embodiments of the present invention.

[0049] A manufacturing process for a fully wrapped leather folding machine protective case includes a preparation step S1: providing a folding machine protective case 4 and a finished PU leather material 5 that imitates the folding machine protective case 4;

[0050] The folding machine protective case 4 includes an upper shell 41 and a lower shell 42. The lower end of the upper shell 41 is hinged to the lower shell 42, so that the upper shell 41 can be turned up and down relative to the hinge. Both the upper shell 41 and the lower shell 42 have an inner ring side (also referring to the side that contacts the bottom end surface of the folding mobile phone during use) and an outer ring side (also referring to the back plate 401 side) that are oppositely arranged. A treatment agent is applied to the inner and outer surfaces of the upper shell 41 and the lower shell 42 to obtain a semi-finished product in the first stage;

[0051] As Figure 14 shown, the manufacturing steps of the finished PU leather material 5 that imitates the folding machine protective case 4 are as follows:

[0052] Step S11: Cut the PU sheet 7 according to the size of the folding machine protective case 4. Apply the first hot melt adhesive on the top surface (outer surface) of the cut PU sheet 7 and cover it with the first release paper. Then, perform the first lamination hot pressing on it through a double-headed hot press (not shown in the figure). After the lamination hot pressing is completed, remove the first release paper (not shown in the figure) and perform the first static placement. After the static placement is completed, apply the second hot melt adhesive 8 on the top surface of the PU sheet 7 (to make up for the glue and thicken the glue layer as needed) and cover it with the second release paper (not shown in the figure). Then, perform the second lamination hot pressing on it through the double-headed hot press. After the lamination hot pressing is completed, remove the second release paper and perform the second static placement to obtain a semi-finished product in the second stage;

[0053] In this embodiment, the double-headed hot press includes at least an upper mold assembly and a lower mold assembly. Among them, a plurality of lower holes and a plurality of hot melt adhesive holes are provided on the cut PU sheet 7, and the plurality of lower holes and the plurality of hot melt adhesive holes are installed on the lower mold assembly and the upper mold assembly. Among them, in step S11, the surface temperature of the upper mold of the double-headed hot press for the first lamination hot pressing is 200 ± 30 °C, up for 2 s, down for 1.5 s, the pressing holding time is 2 s, the pressure increase is 13 ± 3 s, and the pressure is 0.5 ± 0.1 mpa. The first static placement time is 2 hours. In this embodiment, the double-headed hot press is an existing device, which will not be elaborated here.

[0054] In step S11, the surface temperature of the upper die of the double-headed hot press for the second lamination and hot pressing is 200 ± 30 °C, upward for 2 s, downward for 1.5 s, the lamination holding time is 2 s, the pressure boosting time is 13 ± 3 s, and the pressure is 0.5 ± 0.1 mpa. The first standing time is 4 hours;

[0055] Preferably, the PU sheet 7 can be made using currently mature formulations and technologies and can usually be directly purchased on the market. In this embodiment, a production formulation for the PU sheet 7 is also provided. It is formed by mixing at least raw materials such as superfine fiber, PU, hot melt adhesive, polyester, and TPU to form a mixture, and then a new PU sheet 7 is made from this mixture.

[0056] Press the second-stage semi-finished product tightly with a double-headed hot press for inspection and repair (for example, filling glue at the glue leakage area);

[0057] In step S12, after the correction is completed, a layer of removable PET film 9 is laid on the bottom surface of the second-stage semi-finished product to obtain a third-stage semi-finished product;

[0058] In step S13, prepare a hot press molding machine and set the temperature. Cover the bottom end face of the third-stage semi-finished product with silica gel and place it in the hot press molding machine for hot press molding on the surface of the silica gel 10 to obtain a fourth-stage semi-finished product that is shaped like the folding machine protective shell 4, so that a removable silica gel part is formed on the bottom surface of the fourth-stage semi-finished product; in step S13, the set temperature of the hot press molding machine is a surface temperature of 160 ± 50 °C, a mold temperature of 160 ± 50 °C, heating for 12 ± 5 s, molding for 15 ± 3 s, pressure boosting for 3 ± 2 s, and the pressure is 111V.

[0059] In step S14, trim the periphery of the fourth-stage semi-finished product, and while removing the (deformed) silica gel part from the fourth-stage semi-finished product, perform corner treatment to obtain a PU leather finished product 5 that is shaped like the folding machine protective shell 4;

[0060] Preferably, in step S14, the fourth-stage semi-finished product at least includes a back plate 401, a frame 402, a first extension part 403, and a second extension part 404. The back plate 401 has an upper covering part 4011, a lower covering part 4012, and an extension part 4013; in this embodiment, the shape of the fourth-stage semi-finished product is formed by stamping with a stamping die.

[0061] The upper covering part 4011 is connected to the lower covering part 4012 through the extension part 4013; the frame 402 extends from the edge of the back plate 401 towards the bottom end to enclose a chamber. The first extension part 403 extends from the outer edge of the frame 402, and the second extension part 404 extends from the outside of the first extension part 403;

[0062] AsFigure 5 As shown, when the semi-finished product in the fourth stage is cut for the first time, the extension part is first cut and corrected. The semi-finished product in the fourth stage is placed in a cutting device. Then, a PC board is laid on the back plate 401. The cutting device is used to perform the first cut on the first extension part 403. After the first cut is completed, it is left standing. After standing, the second cut is performed. The semi-finished product in the fourth stage after the first cut is placed in a side cutting device. A pressing block is pressed on the extension part 4013. The side cutting device is used to perform side cutting on the second extension part 404. After side cutting is completed, the pressing block is removed. After the second cut is completed, the silicone part is removed and the corners are processed simultaneously to obtain the PU sheet 7.

[0063] Preferably, the cutting device includes a base 1, a positioning die 2 provided on the base 1, and a cutting mechanism 3;

[0064] The positioning die 2 at least includes an upper template 21 and a lower template 22 which are arranged opposite to each other up and down. A positioning block 23 is provided on the lower template 22. A forming cavity 217 is recessed on the lower end surface of the upper template 21. The upper template 21 is arranged above the lower template 22 in a vertically movable manner;

[0065] The cutting mechanism 3 at least includes a first cutting assembly 31 and a second cutting assembly 32 provided on the periphery of the positioning block 23; The first cutting assembly 31 at least includes a first abutting block 311, a first cutting knife 312, and a first driving device 313; The first cutting knife 312 is provided on the first abutting block 311; The first driving device 313 is respectively connected to the first abutting block 311 and the first cutting knife 312; The first driving device 313 drives the first cutting knife 312 and the first abutting block 311 to reciprocate left and right; A first vertical groove 314 is recessed on the outer side wall of the first abutting block 311, and a second vertical groove 324 is provided on the side wall of the second abutting block 321 close to the first abutting groove;

[0066] The second cutting assembly 32 at least includes a second abutting block 321, a second cutting knife 322, and a second driving device 323; The second cutting knife 322 is movably provided on the second abutting block 321; The second abutting block 321 is located beside the first abutting block 311; The second driving device 323 is connected to the second cutting knife 322; The second driving device 323 drives the second cutting knife 322 to reciprocate left and right;

[0067] A mounting groove 221 is further recessed between the first abutting block 311 and the second abutting block 321, and a limiting block 222 is arranged in the mounting groove 221; the limiting block 222 includes a main body portion 223, a first limiting portion 224 for cooperating with the first vertical groove 314, and a second limiting portion 225 for cooperating with the second vertical groove 324; a driving rod is further arranged on the lower end face of the upper template 21 corresponding to the upper part of the limiting block 222. The limiting block 222 can move between a locking position and an unlocking position relative to the mounting groove 221. When the limiting block 222 is in the locking position, the first limiting portion 224 and the second limiting portion 225 are respectively located in the first vertical groove 314 and the second vertical groove 324; when the limiting block 222 is in the unlocking position, the first limiting portion 224 and the second limiting portion 225 are respectively disengaged from the first vertical groove 314 and the second vertical groove 324. In this way, the first pre-positioning of the product to be cut is formed; secondly, before cutting, the first abutting block 311 and the second abutting block 321 form the second pre-pressing positioning of the product to be cut and perform cutting, so that accurate positioning can be realized, ensuring that when cutting the mobile phone case, the cutting knife can be accurately cut in place, improving the product quality and production efficiency; finally, due to the design of the limiting block 222, it can prevent the first abutting block 311 and the second abutting block 321 from loosening, which may affect the positioning and cutting deviation and thus affect the cutting quality of the product.

[0068] Preferably, a pull rod 216 is further arranged on one side of the positioning block 23 close to the first abutting block 311, and one end of the pull rod 216 is connected to the first abutting block 311; a first positioning groove 315 is arranged on the outer side of the first abutting block 311, and a second positioning groove 316 is arranged on the outer side of the first cutting knife 312. The first positioning groove 315 and the second positioning groove 316 are arranged in a vertically penetrating manner to form a matching groove 317; the first cutting assembly 31 further includes a first pushing block 318. A matching portion 319 is arranged on one side of the first pushing block 318 close to the matching groove 317. The first pushing block 318 is respectively connected to the first abutting block 311 and the first cutting knife 312, and the matching portion 319 is adapted to the matching groove 317.

[0069] Preferably, a first sliding groove 215 is further provided beside the molding cavity 217; a second sliding groove 325 is provided on the upper surface of the second abutting block 321; the second cutting assembly 32 further includes a second pushing block 326, and upper and lower surfaces of the second pushing block 326 are respectively provided with a first sliding portion 3261 slidably engaged with the first sliding groove 215 and a second sliding portion 3262 for slidably engaging with the second sliding groove 325. An output end of the second driving device 323 is connected to the second pushing block 326, and the second pushing block 326 is respectively slidably connected to the upper template 21 and the second abutting block 321, so that the first sliding portion 3261 and the second sliding portion 3262 are respectively slidably connected to the first sliding groove 215 and the second sliding groove 325.

[0070] The upper template 21 includes a first upper module 211, a second upper module 212 and a third upper module 213. The molding cavity 217, the first sliding groove 215 and the second sliding groove 325 are all provided on the third upper module 213. Wherein, a first guiding hole is formed in the first upper module 211, and a second guiding hole is provided on the base 1 corresponding to the first guiding hole. The first upper module 211 and the base 1 are guidingly connected through guiding columns 214 respectively passing through the first guiding hole and the second guiding hole. The first cutting mechanism 3 and the second cutting mechanism 3 are both installed and positioned on the base 1 through a transfer rack 12. The first driving device 313 and the second driving device 323 are both motors or cylinders. The first cutting knife 312 is locked to the first abutting block 311 through a first screw, and the second cutting knife 322 is locked to the second abutting block 321 through a second screw.

[0071] Laminating step: Place the semi-finished product of the first stage in the positioning mold 2, then pre-laminate the finished PU leather 5 corresponding to the position of the semi-finished product of the first stage, then perform secondary hot pressing and primary cold pressing, and then successively pass through exhaust - hot pressing - cold pressing to manufacture the fully wrapped leather folding machine protective shell 4.

[0072] Preferably, in the laminating step, after the pre-laminating is completed, exhaust is performed to obtain a semi-finished product of the fifth stage, then the semi-finished product of the fifth stage is subjected to secondary hot pressing and primary cold pressing to obtain a semi-finished product of the sixth stage, and then successively pass through exhaust - hot pressing - cold pressing to manufacture the fully wrapped leather folding machine protective shell 4, so that the hot melt adhesive quickly solidifies when pasted to the folding machine protective shell 4 and the forming stability of the PU leather finished product 5 imitating the folding machine protective shell 4 is improved, and the firmness of the paste is increased.

[0073] Preferably, in the laminating step, first place the semi-finished product of the first stage in the positioning mold 2 for pre-laminating. After pre-laminating, align the PU leather with the position of the semi-finished product of the first stage and press it firmly. Stabilize the PU leather with the heating element so that the PU leather adheres tightly to the semi-finished product of the first stage. After adhesion, obliquely pierce the bubbling and protruding positions, and then use the heating element to exhaust the air bubbles towards the obliquely pierced areas to obtain the semi-finished product of the fifth stage.

[0074] Among them, a positioner (air blower) can be used to heat the bubbling and protruding positions, press and align them with the upper / lower PC shell corner positions, and then press firmly to exhaust the air.

[0075] Preferably, in the laminating step, first place the semi-finished product of the fifth stage in the hot press. First, perform the first hot press on the back panel 401 and the frame 402. The total hot press time is 20 ± 4 s, the surface temperature of the upper die of the air press is 140 ± 10 °C (the mold temperature is 120 ± 10 °C), the pressing time is 10 ± 1 s, and the pressure is 0.4 ± 0.1 mpa. The air press equipment must have functions of timing and constant temperature.

[0076] After the first hot press is completed, perform the second hot press on the back panel 401, the frame 402, and the four corner positions. The surface temperature of the upper die of the arc-pushing machine is 140 ± 10 °C (the mold temperature is 120 ± 10 °C), the side straight surface is pushed for 24 ± 1 s, the rounded corner position is pushed for 12 ± 1 s, and the pressure is 0.5 ± 0.1 mpa. The arc-pushing machine equipment must have functions of timing and constant temperature.

[0077] After the second hot press is completed, perform cold pressing on the back panel 401, the frame 402, and the four corner positions to obtain the semi-finished product of the sixth stage. Use the arc-pushing machine to push the side straight surface for 24 ± 1 s, the rounded corner position for 12 ± 1 s, and the pressure is 0.5 ± 0.1 mpa. The arc-pushing machine equipment must have functions of timing and constant temperature; then, through exhaust-heat press-cold press, the fully wrapped leather folding machine protective shell 4 is made.

[0078] Among them, the preparation step S1 also includes preparing the pull ring 7.

[0079] The manufacturing steps of the finished pull ring 7 are as follows:

[0080] Grind both ends of the Meng steel sheet and apply a treatment agent on the outside. Then, attach the Meng steel sheet to the groove of the upper housing 41 and place it in a hydraulic press for hot pressing. The surface temperature of the upper die of the hydraulic press is 150±10°C (the die temperature is 120±10°C), the pressing time is 13±1 s, and the pressure is 0.3±0.1 mpa. Among them, the hydraulic press must have functions of timing and constant temperature. Then, cut the PU sheet 7 according to the size of the Meng steel sheet, apply the first layer of hot melt adhesive on the top surface of the cut PU sheet 7, cover it with the first release paper, and perform the first bonding hot pressing on it through a double-headed hot press. After the bonding hot pressing is completed, remove the first release paper and perform the first static placement. After the static placement is completed, a PU part used to wrap the Meng steel sheet is obtained. Trim and cut the PU part, and smooth the two ends with a small soldering iron to make sure there are no burrs.

[0081] Place the Meng steel sheet on a tabletop protected by EPE. Among them, the Meng steel sheet should not have stains, damage, defects, color fading and other defects. After inspection, neatly place it in a blister shell with EPE, and cut a one-inch-long protective film and stick it around the two sides of the Meng steel sheet and press it tightly for protection.

[0082] Place the Meng steel sheet flat on the mold and press it tightly. Then, use a hair dryer to heat the square frame surface. Finally, use the PU part used to wrap the Meng steel sheet to wrap and sew the Meng steel sheet. After the wrapping and sewing are completed, place it in a hydraulic press for hot pressing. After the hot pressing is completed, perform grinding - cleaning - edge ironing - coloring to obtain a finished pull ring. Sew the finished pull ring to the extension part 4013. After the sewing is completed, cut the excess thread ends. Finally, after the folding machine protective shell 4 is integrally connected with a PU leather finished product 5 with a profiling design according to the actual needs, corresponding ear holes and button holes are opened.

[0083] The design focus of the present invention is that mainly through the process design of the profiling PU leather finished product of the folding machine protective shell, cut the PU sheet according to the size of the folding machine protective shell, apply the first layer of hot melt adhesive on the top surface of the cut PU sheet, cover it with the first release paper, and perform the first bonding hot pressing on it, so that the hot melt adhesive can better penetrate into the bottom of the material and make the adhesion between the hot melt adhesive and the PU sheet stronger.

[0084] Next, after the bonding hot pressing is completed, remove the first release paper, apply the second layer of hot melt adhesive on the top surface of the PU sheet, cover it with the second release paper, and perform the second bonding hot pressing on it. In this way, while increasing the amount of glue, it can fully contact and infiltrate the top surface of the PU sheet, and further improve the firm bonding between the hot melt adhesive and the folding machine protective shell.

[0085] Next, a removable PET film is laid on the bottom surface of the semi-finished product in the second stage to obtain a semi-finished product in the third stage. Silicone is covered on the bottom end surface of the semi-finished product in the third stage and hot press forming is carried out on the surface of the silicone to obtain a semi-finished product in the fourth stage that is shaped like the folding machine protective case. In this way, after the PU sheet material is hot press formed, the design of the PET film and the silicone is used to fix the forming effect of the plasticized PU sheet material and it is not easy to deform;

[0086] Finally, the semi-finished product in the first stage is placed in a positioning mold. Then, the finished PU leather is pre-pasted corresponding to the position of the semi-finished product in the first stage, and then secondary hot pressing and primary cold pressing are carried out. Then, it passes through exhaust - hot pressing - cold pressing in sequence to make a fully wrapped leather folding machine protective case. In this way, the folding machine protective case is formed by bonding a finished PU leather with a profiling design into one body. The process corners do not wrinkle, and the operation process is simple, improving the production efficiency.

[0087] The above are only the preferred embodiments of the present invention, and do not impose any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A manufacturing process for a fully wrapped leather folding machine protective case, characterized in that: It includes a preparation step S1: providing a folding machine protective case and a finished PU leather material that is shaped to fit the folding machine protective case; The folding machine protective case includes an upper case and a lower case. Both the upper case and the lower case have an inner ring side and an outer ring side that are oppositely arranged. A treatment agent is applied to the inner and outer surfaces of the upper case and the lower case to obtain a semi-finished product in the first stage. The steps for manufacturing the finished PU leather material that is shaped to fit the folding machine protective case are as follows: Step S11: Cut the PU sheet according to the size of the folding machine protective case. Apply hot melt adhesive for the first time on the top surface of the cut PU sheet and cover it with a first release paper, and perform the first laminating hot pressing on it. After the laminating hot pressing is completed, remove the first release paper, then apply hot melt adhesive for the second time on the top surface of the PU sheet and cover it with a second release paper, and perform the second laminating hot pressing on it. After the laminating hot pressing is completed, remove the second release paper to obtain a semi-finished product in the second stage; Step S12: Lay a layer of removable PET film on the bottom surface of the semi-finished product in the second stage to obtain a semi-finished product in the third stage; Step S13: Cover the bottom end surface of the semi-finished product in the third stage with silica gel and perform hot pressing molding on the surface of the silica gel to obtain a semi-finished product in the fourth stage that is shaped to fit the folding machine protective case; Step S14: Cut the periphery of the semi-finished product in the fourth stage and remove the silica gel part from the semi-finished product in the fourth stage to obtain a finished PU leather material that is shaped to fit the folding machine protective case; Laminating step: Place the semi-finished product in the first stage in a positioning mold, then pre-laminate the finished PU leather material corresponding to the position of the semi-finished product in the first stage, and then perform secondary hot pressing and primary cold pressing, and then go through exhaust - hot pressing - cold pressing in sequence to make a fully wrapped leather folding machine protective case.

2. The manufacturing process of the fully wrapped leather folding machine protective case according to claim 1, characterized in that: In the laminating step, exhaust is performed after the pre-laminating is completed to obtain a semi-finished product in the fifth stage, then secondary hot pressing and primary cold pressing are performed on the semi-finished product in the fifth stage to obtain a semi-finished product in the sixth stage, and then go through exhaust - hot pressing - cold pressing in sequence to make a fully wrapped leather folding machine protective case.

3. The manufacturing process of the fully wrapped leather folding machine protective case according to claim 1, characterized in that: In step S11, after removing the first release paper, perform the first standing. After the standing is completed, apply hot melt adhesive for the second time on the top surface of the PU sheet; after removing the second release paper, perform the second standing to obtain a semi-finished product in the second stage.

4. The manufacturing process of the fully wrapped leather folding machine protective case according to claim 1, characterized in that: In step S14, the semi-finished product in the fourth stage at least includes a back plate, a frame, a first extension part, and a second extension part. The back plate has an upper covering part, a lower covering part, and an extension part; the upper covering part is connected to the lower covering part through the extension part; the frame extends from the edge of the back plate towards the bottom end to enclose a chamber, the first extension part extends from the outer edge of the frame, and the second extension part extends from the outside of the first extension part; When performing the first cutting on the semi-finished product in the fourth stage, first perform cutting and correction on the extension part. Place the semi-finished product in the fourth stage in the cutting device, then lay a PC board on the backplane, and use the cutting device to perform the first cutting on the first extension part. After the first cutting is completed, let it stand. After standing, perform the second cutting. Place the semi-finished product in the fourth stage after the first cutting in the side cutting device, press a lower pressing block at the extension part, and use the side cutting device to perform side cutting on the second extension part. After side cutting is completed, remove the lower pressing block. After the second cutting is completed, remove the silicone part and perform edge treatment at the same time to obtain a PU sheet.

5. The manufacturing process of the fully wrapped leather folding machine protective case according to claim 4, characterized in that: The cutting device includes a base, a positioning mold disposed on the base, and a cutting mechanism; the positioning mold at least includes an upper template and a lower template that are disposed opposite to each other up and down. A positioning block is disposed on the lower template. A forming cavity is recessed on the lower end surface of the upper template. The upper template is movably disposed directly above the lower template in the up and down direction. The cutting mechanism at least includes a first cutting component and a second cutting component disposed on the periphery of the positioning block; the first cutting component at least includes a first abutting block, a first cutting knife, and a first driving device; the first cutting knife is disposed on the first abutting block; the first driving device is respectively connected to the first abutting block and the first cutting knife; the first driving device drives the first cutting knife and the first abutting block to reciprocate left and right; a first vertical groove is recessed on the outer side wall of the first abutting block, and a second vertical groove is disposed on the side wall of the second abutting block close to the first abutting groove. The second cutting component at least includes a second abutting block, a second cutting knife, and a second driving device; the second cutting knife is movably disposed on the second abutting block; the second abutting block is located beside the first abutting block; the second driving device is connected to the second cutting knife; the second driving device drives the second cutting knife to reciprocate left and right. A mounting groove is further recessed between the first abutting block and the second abutting block, and a limiting block is disposed in the mounting groove; the limiting block includes a main body portion, a first limiting portion for cooperating with the first vertical groove, and a second limiting portion for cooperating with the second vertical groove; a driving rod is further disposed on the lower end surface of the upper template directly above the limiting block. The limiting block can move between a locked position and an unlocked position relative to the mounting groove. When the limiting block is in the locked position, the first limiting portion and the second limiting portion are respectively located in the first vertical groove and the second vertical groove; when the limiting block is in the unlocked position, the first limiting portion and the second limiting portion respectively disengage from the first vertical groove and the second vertical groove.

6. The manufacturing process of the fully wrapped leather folding machine protective case according to claim 5, characterized in that: A pull rod is further arranged on one side of the positioning block close to the first abutting block, and one end of the pull rod is connected to the first abutting block; a first positioning groove is arranged on the outer side of the first abutting block, a second positioning groove is arranged on the outer side of the first cutting knife, and the first positioning groove and the second positioning groove are arranged in a vertically penetrating manner to form a matching groove; the first cutting assembly further includes a first pushing block, a matching portion is arranged on one side of the first pushing block close to the matching groove, the first pushing block is respectively connected to the first abutting block and the first cutting knife, and the matching portion is adapted to the matching groove.

7. The manufacturing process of the fully wrapped leather folding machine protective case according to claim 6, characterized in that: A first sliding groove is further arranged beside the forming cavity; a second sliding groove is arranged on the upper surface of the second abutting block; the second cutting assembly further includes a second pushing block, a first sliding portion slidably matched with the first sliding groove and a second sliding portion for slidably matching with the second sliding groove are respectively arranged on the upper and lower surfaces of the second pushing block, the output end of the second driving device is connected to the second pushing block, and the second pushing block is respectively slidably connected to the upper template and the second abutting block, so that the first sliding portion and the second sliding portion are respectively slidably connected to the first sliding groove and the second sliding groove.

8. The manufacturing process of the fully wrapped leather folding machine protective case according to claim 1, characterized in that: In step S12, first, hot melt adhesive is applied to the bottom surface of the second-stage semi-finished product after correction, and then the PET film is covered on the bottom surface and subjected to bonding hot pressing by a double-head hot press, so that the PET film is formed on the bottom surface of the second-stage semi-finished product. Among them, the surface temperature of the upper die of the double-head hot press is 140±30°C, the die temperature is 110±20°C, the upper die assembly moves upward for 2 s, moves downward for 2 s, presses for 4±2 s, and boosts the pressure for 4±2 s, and the pressure is 0.5±0.1 mpa.

9. The manufacturing process of the fully wrapped leather folding machine protective case according to claim 2, characterized in that: In the bonding step, first, the first-stage semi-finished product is placed in a positioning mold for pre-bonding. After pre-bonding, the PU leather is bonded and pressed corresponding to the position of the first-stage semi-finished product. The PU leather is stabilized by a heating element, so that the PU leather tightly adheres to the first-stage semi-finished product. After tight adhesion, it is obliquely punctured at the foaming and protruding positions, and then the air bubbles are exhausted to the obliquely punctured places by the heating element to obtain the fifth-stage semi-finished product.

10. The manufacturing process of the fully enclosed leather folding machine protective case according to claim 2, characterized in that: In the bonding step, first, the fifth-stage semi-finished product is placed in a hot press. First, the back plate and the frame are subjected to the first hot pressing, and the total hot pressing time is 20±4 s. After the first hot pressing is completed, the back plate, the frame and the four corners are subjected to hot pressing. After the second hot pressing is completed, the back plate, the frame and the four corners are subjected to cold pressing to obtain the sixth-stage semi-finished product, and then through exhaust-heat pressing-cold pressing, a full-coverage leather folding machine protective shell is made.

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