A composite material protective film preparation die-cutting device and process

Abstract

The present invention discloses a composite material protective film preparation die-cutting device and process, belonging to the technical field of die-cutting devices, including a bottom plate, an annular cutter installed on the upper surface of the bottom plate, a pressing plate arranged parallel to the annular cutter, and a plurality of positive pressure air holes are opened on the lower surface of the pressing plate corresponding to the blanking area, the positive pressure air holes are used to provide positive pressure wind force toward the side where the bottom plate is located, the positive pressure air holes are formed on a plurality of concentric circles with the center of the annular cutter as the center of the circle, and the positive pressure air holes on the same circumference are grouped as a group, each group of positive pressure air holes is evenly distributed on the circumference where it is located, each group of positive pressure air holes is connected to a positive pressure conveying device, and the conveying pressure of the positive pressure conveying device is positively correlated with the radius of the circumference where the group of positive pressure air holes is located. The device of the present invention can reduce the displacement difference between the middle part and the edge part of the protective film, prevent the occurrence of problems such as delamination or interlayer offset, thereby improving the die-cutting accuracy of the composite material protective film.

Description

Technical Field

[0001] The invention belongs to the technical field of die-cutting devices, and in particular relates to a die-cutting device and process for preparing a composite material protective film. Background Art

[0002] In order to meet the size of protective films for different electronic products, protective films generally need to be punched out using die-cutting devices to meet the size and appearance. Unlike traditional protective films, composite protective films are made of multiple layers of materials. When cutting composite protective film, the middle part of the protective film can be squeezed smoothly. The protective film at the edge of the cut is squeezed by the cutter and is not easy to enter the inner side of the cutter, resulting in the relative sliding of the protective film and the cutter after cutting. After the edge and middle parts of the protective film are relatively displaced, the adjacent two layers of composite materials are prone to offset, resulting in delamination and other phenomena, which seriously affects the die-cutting accuracy of the product. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a composite material protective film preparation die-cutting device and process, which can solve the above technical problems.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] The present invention discloses a composite material protective film preparation die-cutting device, comprising a base plate, an annular cutter installed on the upper surface of the base plate, and a pressing plate arranged parallel to the annular cutter, the tip of the annular cutter protruding from the surface of the base plate, the annular cutter divides the upper surface of the base plate into an inner blanking area and an outer residual area, and a plurality of positive-pressure air holes are opened on the lower surface of the pressing plate corresponding to the blanking area, the positive-pressure air holes are used to provide positive-pressure wind force toward the side where the base plate is located, the positive-pressure air holes are formed on a plurality of concentric circles with the center of the annular cutter as the center, the positive-pressure air holes on the same circumference are grouped together, each group of positive-pressure air holes is evenly distributed on the circumference thereof, each group of positive-pressure air holes is correspondingly connected to a positive-pressure conveying device, and the conveying pressure of the positive-pressure conveying device is positively correlated with the radius of the circumference of the group of positive-pressure air holes.

[0006] Furthermore, a top plate is arranged parallel to the top of the pressure plate, a vertical guide structure is arranged between the pressure plate and the top plate, the top plate is connected to a hydraulic device, the positive pressure delivery device includes an elastic airbag installed between the top plate and the pressure plate, the elastic airbag is connected to an exhaust pipe, and the exhaust pipe is installed in the positive pressure air hole.

[0007] Furthermore, an air suction hole is opened on the top plate, an air suction pipe is installed in the air suction hole, the air suction pipe is connected to the elastic airbag, and one-way valves are installed in both the air suction pipe and the exhaust pipe.

[0008] Furthermore, a heating device is installed on the inner side of the top plate, and the heating device is installed on the outer side of the air intake pipe.

[0009] Furthermore, an inner elastic support block is installed on the inner side of the annular cutter, and the area of ​​the inner elastic support block is adapted to the area of ​​the blanking area.

[0010] Furthermore, an outer side of the annular cutter is installed with an outer side elastic support block, and the area of ​​the outer side elastic support block is adapted to the area of ​​the residual material area.

[0011] Furthermore, hard balancing blocks are installed on the outer sides of the inner elastic support block and the outer elastic support block.

[0012] Furthermore, an annular base is installed on the outer side of the annular cutter, a support ring is slidably arranged inside the annular base, annular flanges are formed on the inner and outer sides of the support ring, the hard balance block abuts against the lower surface of the annular flange, and an elastic support member is arranged at the bottom of the support ring.

[0013] Furthermore, a conical groove is formed on the inner side of the support ring, and an elastic filling surface is installed on the inner wall of the conical groove.

[0014] A composite material protective film preparation die-cutting process, using a composite material protective film preparation die-cutting device as described in any of the above items, firstly placing the composite material protective film on the upper side of a circular cutter, applying vertical downward pressure to a pressure plate so that the pressure plate presses the composite material protective film to the circular cutter to achieve die-cutting, and at the same time simultaneously starting each group of positive pressure conveying devices from outside to inside according to the distribution radius of the positive pressure air holes, ensuring that the outermost positive pressure air holes have the largest positive pressure, providing positive pressure from top to bottom for the outer edge of the protective film after die-cutting, and reducing slippage between composite materials.

[0015] The beneficial effects of the present invention are:

[0016] The present invention discloses a die-cutting device for preparing a composite material protective film. The protective film product after die-cutting is concave in shape. Since the protective film at the cut edge is easily delaminated due to the squeezing of the cutter, the device of the present invention arranges positive pressure air holes on the upper side of the protective film. The positive pressure air holes are used to provide positive pressure wind force toward the side where the bottom plate is located, so that the protective film at the edge can be displaced under the action of the positive pressure wind force, reducing the displacement difference with the middle part of the protective film, preventing the occurrence of problems such as delamination or interlayer offset, thereby improving the die-cutting accuracy of the composite material protective film.

[0017] In the device disclosed in the present invention, a plurality of positive pressure air holes are opened in the blanking area, which can provide a downward force for the protective film to prevent the protective film from adhering to the lower surface of the pressing plate. After the blanking is completed, the formed product can be separated from the pressing plate in time, which is convenient for material removal.

[0018] In the device disclosed in the present invention, the delivery pressure of the positive pressure delivery device is positively correlated with the radius of the circle where the group of positive pressure air holes are located, that is, the protective film at the edge has a greater positive pressure, thereby ensuring the uniformity of deformation of each point on the protective film.

[0019] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0021] Figure 1 It is a structural schematic diagram of the die-cutting device of the present invention;

[0022] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0023] Figure 3 for Figure 1 The enlarged view of point B in the middle;

[0024] Figure 4 This is a schematic diagram of the deformation of the protective film during die-cutting;

[0025] Figure 5 It is a structural schematic diagram of the ring base.

[0026] The markings in the accompanying drawings are as follows: bottom plate 1, annular cutter 2, pressure plate 3, positive pressure air hole 4, top plate 5, vertical guide structure 6, elastic air bag 7, exhaust pipe 8, suction hole 9, suction pipe 10, one-way valve 11, heating device 12, inner elastic support block 13, outer elastic support block 14, hard balance block 15, annular base 16, support ring 17, annular flange 18, elastic support member 19, elastic filling surface 21, protective film 22. DETAILED DESCRIPTION

[0027] like Figures 1 to 5As shown, the present invention discloses a composite material protective film preparation die-cutting device, wherein the protective film 22 includes a substrate layer, a glue layer, a heat insulation layer and a hot air layer, the protective film 22 is circular as a whole, and can also be square or other closed polygonal shapes as needed, the die-cutting device at least includes a base plate 1, an annular cutter 2 installed on the upper surface of the base plate 1, and a pressing plate 3 arranged parallel to the annular cutter 2, the tip of the annular cutter 2 protrudes from the surface of the base plate 1, when in use, the protective film 22 is placed between the base plate 1 and the pressing plate 3, the pressing plate 3 is moved downward by a hydraulic device, and the annular cutter 2 cuts the protective film 22 into a desired shape.

[0028] Among them, the annular cutter 2 divides the upper surface of the base plate 1 into an inner blanking area and an outer residual area. After being formed, the protective film 22 falls into the blanking area. Corresponding to the blanking area, a number of positive pressure air holes 4 are opened on the lower surface of the pressing plate 3. In some other embodiments, the upper ends of the positive pressure air holes 4 are connected to the fan. Through the action of the fan, the positive pressure air holes 4 are used to provide positive pressure wind force toward the side where the base plate 1 is located, so as to assist the blanking of the edge of the protective film 22 and reduce the displacement difference between the middle and edge parts of the protective film 22.

[0029] Specifically, the positive pressure air holes 4 disclosed in the present invention are formed on four concentric circles with the center of the annular cutter 2 as the center. The positive pressure air holes 4 on the same circumference are grouped together, and each group of positive pressure air holes 4 is evenly distributed on the circumference thereof. The positive pressure air holes 4 close to the outside are denser, and each group of positive pressure air holes 4 is correspondingly connected to a positive pressure delivery device.

[0030] In some other embodiments, the number of groups of positive pressure air holes 4 can be increased as needed, and in order to more conveniently control the pressure, it is set to 4 groups. Since the extrusion friction of the protective film 22 closest to the cutter is the largest, the present invention makes the delivery pressure of the positive pressure delivery device positively correlated with the radius of the circle where the group of positive pressure air holes 4 is located, that is, the protective film 22 at the edge has a greater positive pressure, thereby ensuring the uniformity of deformation of each point on the protective film 22, so that the blanking state of the protective film 22 is optimized. Of course, the specific data of the pressure can be obtained based on a limited number of experiments to ensure that the protective film 22 has the best die-cutting accuracy.

[0031] In this embodiment, a top plate 5 is arranged above the pressing plate 3 in parallel, and the top plate 5 is also circular. A vertical guide structure 6 is arranged between the pressing plate 3 and the top plate 5. The vertical guide structure 6 in this embodiment includes a guide post and a limit plate. The guide post is fixed on the pressing plate 3, and the upper end of the guide post passes through the upper end guide hole of the top plate 5. The guide post is fixedly connected with the limit plate to limit the farthest position between the top plate 5 and the pressing plate 3. Through the guiding effect of the guide post, the displacement direction between the pressing plate 3 and the top plate 5 can be along the normal direction of the top plate 5 when relative displacement occurs.

[0032] When in use, the top plate 5 is connected to a hydraulic device, which can be a conventional hydraulic press, and the positive pressure delivery device includes an elastic airbag 7 installed between the top plate 5 and the pressure plate 3, and the elastic airbag 7 is connected to the exhaust pipe 8, and the exhaust pipe 8 is installed in the positive pressure air hole 4. When the pressure plate 3 and the top plate 5 are relatively displaced, the top plate 5 can press the elastic airbag 7 downward, so that the gas in the airbag is squeezed out from the exhaust pipe 8, which plays a role of positive pressure exhaust. It can be understood that the size of the air pressure can be changed by the size of the elastic airbag 7. When a larger elastic airbag 7 is set, a faster positive pressure can be achieved.

[0033] In some other embodiments, the vertical guide structure 6 may adopt conventional guide rails and sliders to limit the relative displacement direction between the top plate 5 and the pressure plate 3 through the effect of sliding fit.

[0034] In this embodiment, a suction hole 9 is provided on the top plate 5, and a suction pipe 10 is installed in the suction hole 9. The suction pipe 10 is connected to the elastic airbag 7, and a one-way valve 11 is installed in the suction pipe 10 and the exhaust pipe 8. The elastic airbag 7 has a certain elastic effect. After the top plate 5 is away from the pressure plate 3, the one-way valve 11 in the suction pipe 10 is used to control the elastic airbag 7 to unidirectionally inlet air from the suction pipe 10, so as to replenish the gas. Of course, the one-way valve 11 in the exhaust pipe 8 is used for the elastic airbag 7 to unidirectionally exhaust air from the exhaust pipe 8 to ensure sufficient positive gas pressure.

[0035] In this embodiment, a heating device 12 is installed on the inner side of the top plate 5, and the heating device 12 is installed on the outer side of the air intake pipe 10. In this embodiment, the heating device 12 adopts a resistance wire, which is fixed inside the top plate 5. The air intake pipe 10 can be heated by the resistance wire, and the gas discharged from the exhaust pipe 8 can be heated, which can soften the protective film 22 to a certain extent, increase the bonding force between the composite material layers after cutting, and further reduce the interlayer offset of the composite material protective film 22.

[0036] In this embodiment, an inner elastic support block 13 is installed on the inner side of the annular cutter 2, and the area of ​​the inner elastic support block 13 is adapted to the area of ​​the blanking area. An outer elastic support block 14 is installed on the outer side of the annular cutter 2, and the area of ​​the outer elastic support block 14 is adapted to the area of ​​the residual material area. By providing an elastic support block, the middle part of the protective film 22 can be elastically supported to reduce the deformation of the protective film 22 during die cutting. In this embodiment, the elastic support block is a rubber block, which can have a large elastic recovery ability to ensure the consistency of the protective film 22 after processing.

[0037] In this embodiment, hard balancing blocks 15, such as plastic blocks, are installed on the outside of the inner elastic support block 13 and the outer elastic support block 14. Since the surface of the hard balancing block 15 has a large tension, the deformation caused by the direct contact between the protective film 22 and the contact surface of the elastic support block can be avoided, thereby preventing the protective film 22 from wrinkling. In the device of the present invention, by setting the hard balancing block 15 on the upper side of the elastic support block, it can guide the deformation of the elastic support block, and the irregular deformation of the surface elastic support block causes an impact on the protective film 22, thereby ensuring the uniform quality of the protective film 22.

[0038] In this embodiment, an annular base 16 is installed on the outer side of the annular cutter 2, and a support ring 17 is slidably arranged inside the annular base 16. An annular flange 18 is formed on the inner and outer sides of the support ring 17. The hard balance block 15 abuts against the lower surface of the annular flange 18. An elastic support member 19 is arranged at the bottom of the support ring 17. The edge of the protective film 22 is supported by the support ring 17, and the elastic support block can be supplemented with support, thereby further reducing the deformation at the edge of the protective film 22.

[0039] In this embodiment, a conical groove is formed on the inner side of the support ring 17, and an elastic filling surface 21 is installed on the inner wall of the conical groove. The cutter can compress the elastic filling surface 21 when extending, and the elastic filling surface 21 can also play a role of supplementary support, so that the support area of ​​the protective film 22 can be maximized to prevent the occurrence of technical problems.

[0040] The present invention discloses a process for preparing a composite material protective film 22 and a device for preparing a composite material protective film 22 based on any of the above items. During operation, the composite material protective film 22 is first placed on the upper side of the annular cutter 2, and a vertical downward pressure is applied to the pressure plate 3, so that the pressure plate 3 presses the composite material protective film 22 to the annular cutter 2 to achieve die-cutting. At this time, each group of positive pressure conveying devices is started from the outside to the inside according to the distribution radius of the positive pressure air holes 4, to ensure that the outermost positive pressure air holes 4 have the largest positive pressure and start to provide wind force first, to provide positive pressure from top to bottom for the outer edge of the protective film 22 after die-cutting, and to reduce slippage between the composite materials.

[0041] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A composite material protective film preparation die-cutting device, comprising a bottom plate, an annular cutter mounted on the upper surface of the bottom plate, and a pressing plate arranged parallel to the annular cutter, characterized in that: The tip of the annular cutter protrudes from the surface of the bottom plate, and the annular cutter divides the upper surface of the bottom plate into an inner blanking area and an outer residual material area. Corresponding to the blanking area, a plurality of positive-pressure air holes are opened on the lower surface of the pressing plate, and the positive-pressure air holes are used to provide positive-pressure wind force toward the side where the bottom plate is located. The positive-pressure air holes are formed on a plurality of concentric circles with the center of the annular cutter as the center of the circle, and the positive-pressure air holes on the same circumference are grouped as a group, each group of positive-pressure air holes is evenly distributed on the circumference where it is located, and each group of positive-pressure air holes is connected to a positive-pressure conveying device, and the conveying pressure of the positive-pressure conveying device is positively correlated with the radius of the circumference where the group of positive-pressure air holes is located; a top plate is arranged parallel to the top of the pressing plate, a vertical guide structure is arranged between the pressing plate and the top plate, the top plate is connected to a hydraulic device, and the positive-pressure conveying device includes an elastic air bag installed between the top plate and the pressing plate, the elastic air bag is connected to an exhaust pipe, and the exhaust pipe is installed in the positive-pressure air hole.

2. A composite material protective film preparation die-cutting device according to claim 1, characterized in that: An air suction hole is provided on the top plate, an air suction pipe is installed in the air suction hole, the air suction pipe is connected to the elastic air bag, and one-way valves are installed in both the air suction pipe and the exhaust pipe.

3. A composite material protective film preparation die-cutting device according to claim 2, characterized in that: A heating device is installed on the inner side of the top plate, and the heating device is installed on the outer side of the air intake pipe.

4. A composite material protective film preparation and die-cutting device according to any one of claims 1 to 3, characterized in that: An inner elastic support block is installed on the inner side of the annular cutter, and the area of ​​the inner elastic support block is adapted to the area of ​​the blanking area.

5. A composite material protective film preparation die-cutting device according to claim 4, characterized in that: An outer elastic support block is installed on the outer side of the annular cutter, and the area of ​​the outer elastic support block is adapted to the area of ​​the residual material area.

6. A composite material protective film preparation die-cutting device according to claim 5, characterized in that: Hard balancing blocks are installed on the outer sides of the inner elastic support block and the outer elastic support block.

7. A composite material protective film preparation die-cutting device according to claim 6, characterized in that: An annular base is installed on the outer side of the annular cutter, a support ring is slidably arranged inside the annular base, annular flanges are formed on the inner and outer sides of the support ring, the hard balance block abuts against the lower surface of the annular flange, and an elastic support member is arranged at the bottom of the support ring.

8. A composite material protective film preparation and die-cutting device according to claim 7, characterized in that: A conical groove is formed on the inner side of the support ring, and an elastic filling surface is installed on the inner wall of the conical groove.

9. A die-cutting process for preparing a composite material protective film, characterized in that: A composite material protective film is prepared by a die-cutting device as described in any one of claims 1 to 8. First, the composite material protective film is placed on the upper side of the annular cutter, and vertical downward pressure is applied to the pressure plate so that the pressure plate presses the composite material protective film to the annular cutter to achieve die-cutting. At this time, each group of positive pressure conveying devices is started from the outside to the inside according to the distribution radius of the positive pressure air holes to ensure that the outermost positive pressure air holes have the largest positive pressure, providing positive pressure from top to bottom for the outer edge of the protective film after die-cutting, thereby reducing slippage between composite materials.

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