A die for punching PET film products

Abstract

The present invention relates to a die for punching PET film products, comprising a first die, a second die and a third die which are sequentially installed on a die-cutting machine according to a die-cutting production line. The first die comprises a first die plate body, on which a first frame pressing protrusion and a sideline pressing protrusion are arranged in a staggered manner; the second die comprises a second die plate body, on which two second frame pressing protrusions are arranged in a staggered manner; the third die comprises a third die plate body, on which a frame-shaped pressing protrusion is arranged. Compared with the prior art, the die-cutting blades corresponding to the PET film products in the first die and the second die of the present invention are both staggered, and the overall row die-cutting of the PET film products is achieved in a step-by-step manner during the die-cutting process; a right-angled triangle-shaped blade is adopted, and the orthographic projection length of the blade along the die-cutting line is significantly reduced, which changes the product imprint and improves the product qualification rate.

Description

Technical Field

[0001] The invention relates to a die-cutting die, in particular to a die for punching PET film products. Background Art

[0002] As mobile phones become thinner, the space inside them is relatively small, which leads to smaller connectors. The fixtures are die-cut products. Compared with the auxiliary fixtures of connectors, the product specifications are getting smaller and smaller. See Figure 1 and Figure 2 The overall thickness of the auxiliary fixing product is above 0.4mm, and the specification is within 2mm*4mm, including PET film and handle film. The structure of each layer of PET film and handle film is shown in Figure 3 .

[0003] For double-sided adhesive PET film products, the general method to solve the above problems is to use hardware molds. However, considering that the processing cost of hardware molds is high and the processing time is long, they are not suitable for processing large quantities of products with unchanged specifications and dimensions for many years. For some products with a relatively small total amount and whose dimensions need to be adjusted in the short term, or products that are still in the sample stage, it is necessary to use a plate-type die-cutting mold. The current plate-type die-cutting mold includes a first mold (1) and a second mold (2). After each die-cutting operation of the first mold (1) and the second mold (2), multiple products distributed in rows can be obtained. See Figure 4 The first die (1) is provided with a protruding rounded rectangular die-cutting blade to realize the overall row die-cutting of the PET film; the second die (2) is a plurality of rounded rectangular die-cutting blades distributed along the width direction of the product after die-cutting by the first die (1), and the PET film of the product distributed along the transverse direction is separated through the second die (2) and the handle film is separated. For the specific die-cutting process, see Figure 6 However, in actual production, due to the high thickness and small size of the product, the edges of the PET film and the handle film will be arched after processing, making the product surface uneven. When assembled in a mobile phone, the auxiliary fixing parts will fall off after being assembled into the mobile phone, which will further reduce the service life of the mobile phone.

[0004] On the other hand, the structure of the blade of a conventional etching die cutter is shown in Figure 5 The blade is a wide-mouthed isosceles triangle-shaped blade. When this blade is used to punch and cut double-sided adhesive PET film, the wide-mouthed blade will produce a longer cutting area, resulting in adhesive spots on the double-sided adhesive on the upper surface of the product, and embossing on the edge of the product after cutting, which will affect the subsequent assembly and use of the product. Summary of the invention

[0005] The purpose of the present invention is to provide a die for punching PET film products in order to overcome the defects of the above-mentioned prior art.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] The die for punching a PET film product in the present invention comprises a first die, a second die and a third die which are sequentially installed on a die-cutting machine according to a die-cutting assembly line, wherein:

[0008] The first cutting die comprises a first cutting die plate body, on which are arranged first frame cutting protrusions and side line cutting protrusions which are staggered in distribution. The two can be spliced ​​into a rounded rectangle and staggered in a product order on the die-cutting assembly line. The cooperation of the first frame cutting protrusions and side line cutting protrusions in the first cutting die realizes the overall row-by-row die-cutting of the PET film in a step-by-step manner. The smaller, non-closed-loop die-cutting contact surface can effectively increase the die-cutting pressure and significantly alleviate the arching and other unevenness of the punching edge of the outer contour of the PET film.

[0009] The second cutting die includes a second cutting die plate body, on which two second frame pressing protrusions are arranged in a staggered manner, and a product sequence is staggered on the die-cutting assembly line. The second cutting die implements single-sided die-cutting of the handle film part in a step-by-step manner, thereby solving the arching phenomenon of the handle film part. One pressing protrusion of the second frame pressing protrusion and a half structure of the frame pressing protrusion together form a unit outer contour of the handle film.

[0010] The third cutting die comprises a third cutting die plate body. The third cutting die plate body is provided with a frame-shaped cutting protrusion. The frame-shaped cutting protrusion and the second frame cutting protrusion can be spliced ​​into a rounded rectangle.

[0011] Furthermore, the frame pressing knife protrusion is a semi-frame type, similar to the "[" type. Since the semi-frame frame pressing knife protrusion is an axisymmetric structure, the symmetrical configuration is conducive to the uniform distribution of die-cutting stress, so that the die-cut product will not warp or arch.

[0012] Furthermore, the edge pressing knife protrusion is modeled after the edge of the PET film, that is, a combination of a straight line and arcs at both ends thereof, wherein each unit corresponds to the width of the head of each PET film product, that is, the width of each straight line with an arc segment is equal to the width of the head of the PET film product.

[0013] Furthermore, the second frame pressing knife protrusion is modeled after the side line of the handle film of the PET film product, that is, a combination of a straight line and arcs at both ends thereof. The addition of the arc structure is used to offset the arching or warping phenomenon caused by the stress imbalance at the die-cut end.

[0014] Furthermore, a hook-shaped protrusion is provided at the end of the second frame pressing knife protrusion, and the die-cutting length appropriately increased by the hook-shaped protrusion is used to offset the arching or warping phenomenon caused by the stress imbalance at the die-cutting end.

[0015] Furthermore, the frame-shaped pressing blade protrusion is molded to the outer contour of the PET film, and the frame-shaped pressing blade protrusion and a second frame pressing blade protrusion together form a rounded rectangular structure.

[0016] Furthermore, two notches are symmetrically arranged in the middle of the frame-shaped pressing knife protrusion, and the notches make the contact surface of the frame-shaped pressing knife protrusion during die-cutting become a non-closed-loop die-cutting contact surface, which significantly solves the arching phenomenon.

[0017] Furthermore, the pressing blades of the first frame pressing blade protrusion, the side line pressing blade protrusion, the second frame pressing blade protrusion and the frame-type pressing blade protrusion are all right-angled triangle blades. Compared with the existing blades, the width of the right-angled triangle blade is significantly reduced, that is, the length of the blade's positive projection along the die-cutting line is significantly reduced, which effectively increases the pressure during die-cutting.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1) The die-cutting blades corresponding to the PET film products in the first die and the second die are both staggered. The die-cutting of the PET film products as a whole is achieved in a step-by-step manner during the die-cutting process. The smaller, non-closed-loop die-cutting contact surface can effectively increase the die-cutting pressure and significantly reduce the arching and other unevenness of the punching edge of the outer contour of the PET film product.

[0020] 2) Both the first cutting die and the second cutting die use a right-angled triangle blade. Compared with the existing blade, the width of the right-angled triangle blade is significantly reduced, that is, the length of the blade's positive projection along the die-cutting line is significantly reduced, which effectively increases the pressure during die-cutting, changes the product imprint, and improves the product qualification rate.

[0021] 3) The mold in this technical solution is simple to prepare and has low cost. It can be applied to the die-cutting of products with a relatively small total amount and whose size needs to be adjusted in the short term, or products that are still in the sample stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the side structure of the PET film product;

[0023] Figure 2 This is a schematic diagram of the main structure of the PET film product;

[0024] Figure 3 for Figure 1 A magnified structural diagram of the middle A area;

[0025] Figure 4 It is a planar structural diagram of a mold used in the prior art;

[0026] Figure 5 It is a schematic diagram of the die-cutting blade structure on a mold in the prior art;

[0027] Figure 6 It is a schematic diagram of the process of punching PET film products in the prior art;

[0028] Figure 7 It is a structural schematic diagram of the mold in this technical solution;

[0029] Figure 8 This is a schematic diagram of the die-cutting blade structure on the mold in this technical solution;

[0030] Fig. 9 This is a schematic diagram of the process of punching PET film products in this technical solution;

[0031] Fig.10 It is a schematic diagram of the mold plane structure of the three molds in this technical solution.

[0032] In the figure: 1, first mold, 2, second mold, 3, third mold, 11, first knife plate body, 12, first frame knife pressing protrusion, 13, side line knife pressing protrusion, 21, second knife plate body, 22, second frame knife pressing protrusion, 221, hook-shaped protrusion, 31, third mold plate body, 32, frame-shaped knife pressing protrusion, 311, notch. DETAILED DESCRIPTION

[0033] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Example

[0035] The die for punching PET film products in the present invention comprises a first die 1, a second die 2 and a third die 3 which are sequentially installed on a die-cutting machine according to a die-cutting assembly line, see Figure 7 , see the mold drawing Fig.10 .

[0036] The first cutting die 1 part: including the first cutting die plate body 11, the first cutting die plate body 11 is provided with a staggered first frame pressing protrusion 12 and a side line pressing protrusion 13, the two can be spliced ​​into a rounded rectangle, and staggered by a product order on the die-cutting assembly line. The cooperation of the first frame pressing protrusion 12 and the side line pressing protrusion 13 in the first cutting die 1 realizes the overall row die-cutting of the PET film in a step-by-step manner. The smaller, non-closed-loop die-cutting contact surface can effectively increase the die-cutting pressure, and significantly alleviate the arching and other unevenness of the punching edge of the outer contour of the PET film. The first frame pressing protrusion 12 is a semi-frame type, similar to the "[" type. Since the semi-frame frame pressing protrusion is an axisymmetric structure, the symmetrical configuration is conducive to the uniform distribution of the die-cutting stress, so that the die-cut product will not warp or arch. The edge line pressing protrusion 13 is a combination of a straight line and arcs at both ends thereof, wherein each unit corresponds to the width of each PET film, that is, the width of each straight line with an arc segment is equal to the width of the PET film.

[0037] The second cutting die part 2 includes a second cutting die plate body 21, on which two second frame pressing protrusions 22 are staggered, which can be spliced ​​into a rounded rectangle and staggered by a product order on the die-cutting assembly line. The second cutting die realizes the single-sided die-cutting of the handle film part in a step-by-step manner, solving the arching phenomenon of the handle film part. One pressing protrusion in the second frame pressing protrusion 22 and half of the structure in the frame pressing protrusion 32 together constitute the outer contour of the handle film of a unit. A hook-shaped protrusion 221 is provided at the end of the second frame pressing protrusion 22. The appropriately increased die-cutting length of the hook-shaped protrusion 221 is used to offset the arching or warping phenomenon caused by the stress imbalance at the die-cutting end.

[0038] The third knife die part 3 includes a third knife die body 31, on which a frame-shaped knife pressing protrusion 32 is provided. The frame-shaped knife pressing protrusion 32 and the second frame knife pressing protrusion 22 can be spliced ​​into a rounded rectangle. The frame-shaped knife pressing protrusion 32 is modeled after the outer contour of the handle film, and the frame-shaped knife pressing protrusion 32 and a second frame knife pressing protrusion 22 together form a rounded rectangular structure, see Fig.10 Two notches 311 are symmetrically arranged in the middle of the frame-shaped pressing blade protrusion 32. The notches 311 make the contact surface of the frame-shaped pressing blade protrusion 32 during die cutting become a non-closed-loop die cutting contact surface, which significantly solves the arching phenomenon.

[0039] Die cutting blade design: see Figure 8 The die-cutting blades of the frame pressing blade protrusion 12, the side line pressing blade protrusion 13, the second frame pressing blade protrusion 22 and the frame pressing blade protrusion 32 are all right-angled triangle blades. Compared with the existing blades, the width of the right-angled triangle blade is significantly reduced, that is, the length of the positive projection of the blade along the die-cutting line is significantly reduced, which effectively increases the pressure during die-cutting.

[0040] For specific die cutting process, see Fig. 9 In the first step of die-cutting, the first die 1 is used to realize the overall row die-cutting of the PET film in steps. In the second step of die-cutting, the blue handle film is added, and then the second die 2 is used to realize the partial die-cutting of the handle film of the PET film product in steps. In the third step of die-cutting, the third die 3 is used to complete the final die-cutting of the handle film, and the final PET film product is obtained after the waste is discharged.

[0041] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A die for punching PET film products, characterized in that: Including the following items installed on the die-cutting machine in sequence according to the die-cutting line: The first cutting die (1) comprises a first cutting die plate body (11), on which are disposed a first frame cutting protrusion (12) and a sideline cutting protrusion (13) which are arranged in a staggered manner, and the first frame cutting protrusion (12) and the sideline cutting protrusion (13) can be spliced ​​into a rounded rectangle and staggered by one product sequence on the die-cutting assembly line; The second cutting die (2) comprises a second cutting die plate body (21), the second cutting die plate body (21) being provided with two second frame cutting protrusions (22) which are staggered and arranged to stagger a product sequence on the die-cutting assembly line; A third cutting die (3) comprises a third cutting die plate body (31), the third cutting die plate body (31) being provided with a frame-shaped cutting die protrusion (32), the frame-shaped cutting die protrusion (32) and the second frame cutting die protrusion (22) being spliced ​​into a rounded rectangle; The first frame pressing protrusion (12) is of a semi-frame type; The second frame pressing protrusion (22) is shaped like the side edge of the handle film; The end of the second frame knife pressing protrusion (22) is provided with a hook-shaped protrusion (221); The frame-shaped knife pressing protrusion (32) is symmetrically provided with two notches (311) in the middle; The pressing blades of the first frame pressing protrusion (12), the edge line pressing protrusion (13), the second frame pressing protrusion (22) and the frame-shaped pressing protrusion (32) are all right-angled triangle-shaped blades.

2. A die for punching PET film products according to claim 1, characterized in that: The edge pressing knife protrusion (13) is shaped like the edge of the PET film.

3. A die for punching PET film products according to claim 1, characterized in that: The frame-shaped pressing knife protrusion (32) is shaped like the outer contour of the PET film.

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