Die cutting assembly for punching L-shaped Mylar double-sided adhesive products and punching method thereof

Abstract

The present invention relates to a die assembly for punching L-shaped Mylar double-sided adhesive products and a punching method thereof, comprising a punching die and a second punching die, wherein the first punching die is composed of a first internal knife line and a second internal knife line of the same shape, and the second punching die is composed of a first external knife line and a second external knife line of the same shape; the first internal knife line and the second internal knife line are centrally symmetrically arranged and spaced; the first external knife line and the second external knife line are centrally symmetrically arranged and spaced, and the two are assembled into a rectangular frame; the first internal knife line cooperates with the first external knife line, and after combined punching, a product is formed between the two; the second internal knife line cooperates with the second external knife line, and after combined punching, another product is formed between the two. The present invention divides the punching of the product into two steps, and discharges waste in two steps, and discharges half of the waste when each step is performed, so as to avoid the problem of falling pieces and product deformation caused by discharging the overall contour waste.

Description

Technical Field

[0001] The invention relates to the technical field of die cutting, and in particular to a die cutter assembly for die cutting an L-shaped Mylar double-sided adhesive product and a die cutting method thereof. Background Art

[0002] With the development of electronic products, especially the smart phone market, die-cutting processing requirements are becoming more and more stringent. Figure 1 As shown, its shape is roughly L-shaped. The L-shaped Mylar double-sided adhesive product is an irregular and smaller Mylar + double-sided adhesive product, in which the Mylar thickness is 0.15mm and the double-sided adhesive is 0.1mm. The product has high viscosity and is easy to re-stick. The width of the two corners is very narrow, not exceeding 1.5mm. Due to the small size, an etching die is required during production, and the knife line needs to be disassembled. Using the existing die and processing technology, due to the two thin corners being too thin, the product has a serious chip drop phenomenon during waste discharge (that is, the product is discharged along with the waste area), and the chip drop defect rate is as high as 15%. In addition, the two corners are too thin. Due to the re-sticking characteristics of the double-sided adhesive, it will also stick to the waste adhesive at the edge of the product during waste discharge, resulting in product deformation, and the defect rate is 5%. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that the existing L-shaped Mylar double-sided adhesive products have serious sheet falling phenomenon and product deformation during waste discharge, and to provide a knife die assembly and a punching method for L-shaped Mylar double-sided adhesive products.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A die cutter assembly for punching an L-shaped Mylar double-sided adhesive product, the die cutter assembly comprising a first die cutter for punching the inner edge contour of the product, and a second die cutter for punching the outer L-shaped edge contour of the product.

[0006] The first punching die is composed of a first internal knife line and a second internal knife line of the same shape, and the second punching die is composed of a first external knife line and a second external knife line of the same shape;

[0007] The first internal knife line and the second internal knife line are centrally symmetrically arranged and spaced apart;

[0008] The first external knife line and the second external knife line are centrally symmetrically arranged and spaced apart, and the two are assembled into a rectangular frame;

[0009] The first internal knife line cooperates with the first external knife line, and after combined punching, a product is formed between the two;

[0010] The second inner knife line cooperates with the second outer knife line, and after combined punching, another product is formed between the two.

[0011] Preferably, the product includes Mylar and double-sided adhesive adhered to the Mylar, and the product is in the shape of an L-shaped sheet, including an outer L-shaped edge and an inner rounded arc edge.

[0012] Preferably, the corner width of the product is 0.8-1.5 mm.

[0013] Preferably, the double-sided tape has a thickness of 0.05-0.15 mm, and the Mylar tape has a thickness of 0.1-0.2 mm.

[0014] Preferably, the contours of the first internal knife line and the second internal knife line are consistent with the shape of the internal edge contour line of the product, and the lengths of the first internal knife line and the second internal knife line are greater than the internal edge contour line of the product, and protruding curved arc knife lines are provided at both ends.

[0015] Preferably, the distance between the first inner cut line and the second inner cut line is 2-3 times the width of the product corner.

[0016] Preferably, the distance between the first outer knife line and the second outer knife line is smaller than the distance between the first inner knife line and the second inner knife line.

[0017] Preferably, the first punching die and the second punching die are provided in multiple groups and arranged in a line.

[0018] Preferably, the first punching die and the second punching die are both arranged on the punching die of the die-cutting device, and both have raised blades.

[0019] A method for punching an L-shaped Mylar double-sided adhesive product, using the above-mentioned die assembly for punching, specifically comprising the following steps:

[0020] (1) The raw material strip with the carrier film, the double-sided adhesive tape and the auxiliary release film is passed through a die-cutting machine and continuously punched by a punching die to punch out the internal contour of the product;

[0021] (2) removing the auxiliary release film and the internal waste between the pair of products, attaching a new auxiliary release film, and continuously punching through a two-punch die to punch out the outer contour of the product;

[0022] (3) After removing the auxiliary release film and the external waste of the product, the finished product is obtained.

[0023] The existing punching method is to use a separate layout method according to the contour of the product. When discharging waste, the waste outside the product will be discharged together with the product, which will cause the product to fall off. In addition, due to the property of double-sided tape that it will stick back, the fine corners will also stick to the waste tape on the edge of the product when discharging waste, resulting in pulling deformation and a high overall defective rate.

[0024] The present invention redesigns the structure of a single punching cutter die and a double punching cutter die. The single punching cutter die is composed of a first internal cutter line and a second internal cutter line of the same shape, which are centrally symmetrically arranged and spaced apart; the double punching cutter die is composed of a first external cutter line and a second external cutter line of the same shape, which are centrally symmetrically arranged and spaced apart, the first internal cutter line cooperates with the first external cutter line, and the second internal cutter line cooperates with the second external cutter line. After combined punching and cutting, a product is formed between the two, and the two products are centrally symmetrically arranged.

[0025] Compared with the prior art, the present invention divides the product punching into two steps, discharges waste in two steps, and discharges half of the waste in each step, thus avoiding the problem of sheet falling and product deformation caused by discharging waste of the overall contour, and discharges half of the waste in the first punch and the second punch, and the waste is connected, which is convenient for waste discharge and avoids sheet falling and deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 , 2 This is a schematic diagram of an L-shaped Mylar double-sided adhesive product of the present invention;

[0027] Figure 3 A schematic diagram of a punching die assembly for an existing Mylar double-sided adhesive product;

[0028] Figure 4 This is a schematic diagram of the layout of existing Mylar double-sided adhesive products after punching;

[0029] Figure 5 It is a schematic diagram of the punching die assembly of the Mylar double-sided adhesive product of the present invention;

[0030] Figure 6 This is a schematic diagram of layout of the Mylar double-sided adhesive product after one-step punching;

[0031] Figure 7 This is a schematic diagram of layout of the Mylar double-sided adhesive product after two-step punching of the present invention;

[0032] In the figure: 1-first internal knife line; 2-second internal knife line; 3-first external knife line; 4-second external knife line. DETAILED DESCRIPTION

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

[0034] like Figure 1 , 2As shown, it is an L-shaped Mylar double-sided adhesive product, which is roughly L-shaped. The L-shaped Mylar double-sided adhesive product is an irregular and smaller Mylar + double-sided adhesive product, in which the Mylar thickness is 0.15mm and the double-sided adhesive is 0.1mm. The product has high viscosity and is easy to stick back. The width of the corners on both sides is very narrow, not exceeding 1.5mm. Due to the small size, an etching knife mold is required during production, and the knife line needs to be disassembled.

[0035] Existing Mylar double-sided adhesive product punching die components such as Figure 3 As shown, the existing Mylar double-sided adhesive products are laid out after punching. Figure 4 As shown, with the existing cutting die and processing technology, the two thin corners are too thin, and the product will seriously fall off during waste discharge (that is, the product is discharged along with the waste area), and the chip falling defect rate is as high as 15%. In addition, the two corners are too thin. Due to the re-adhesive characteristics of the double-sided tape, the waste tape will stick together with the waste tape at the edge of the product during waste discharge, causing product deformation, and the defect rate is 5%.

[0036] In order to solve this technical problem, the present invention provides a die cutter assembly for punching L-shaped Mylar double-sided adhesive products, such as Figure 5 As shown, the die assembly includes a punch die for punching the inner edge contour of the product, and a second punch die for punching the outer L-shaped edge contour of the product. The first punch die is composed of a first inner knife line 1 and a second inner knife line 2 of the same shape, and the second punch die is composed of a first outer knife line 3 and a second outer knife line 4 of the same shape; the first inner knife line 1 and the second inner knife line 2 are centrally symmetrically arranged and spaced; the first outer knife line 3 and the second outer knife line 4 are centrally symmetrically arranged and spaced, and the two are assembled into a rectangular frame; the first inner knife line 1 and the first outer knife line 3 cooperate, and after combined punching, a product is formed between the two; the second inner knife line 2 and the second outer knife line 4 cooperate, and after combined punching, another product is formed between the two. The first punch die and the second punch die are provided with multiple groups, arranged in a line, and the first punch die and the second punch die are both arranged on the punching die of the die-cutting device, and both are raised blades.

[0037] The contours of the first internal knife line 1 and the second internal knife line 2 are consistent with the shape of the internal edge contour line of the product, and the lengths of the first internal knife line 1 and the second internal knife line 2 are greater than the internal edge contour line of the product, and protruding curved arc knife lines are provided at both ends. The spacing between the first internal knife line 1 and the second internal is 2-3 times the width of the product corner, and the spacing between the first external knife line 3 and the second external knife line 4 is less than the spacing between the first internal knife line 1 and the second internal.

[0038] A punching method for L-shaped Mylar double-sided adhesive products, specifically comprising the following steps:

[0039] (1) The raw material strip with the carrier film, double-sided adhesive tape and auxiliary release film is passed through a die-cutting machine and continuously punched through a punching die to punch out the internal contour of the product. After the waste of half of the contour is removed after continuous punching, the effect is as follows: Figure 6 As shown, Figure 6 The non-shaded position is the waste discharge area, and the shaded position is the reserved area;

[0040] (2) removing the auxiliary release film and the internal waste between the pair of products, attaching a new auxiliary release film, and continuously punching through a two-punch die to punch out the outer contour of the product;

[0041] (3) After removing the auxiliary release film and the external waste of the product, the finished product is obtained. After the second punch is matched with the first punch, the effect of continuous punching is as shown in the figure Figure 7 As shown, Figure 7 The middle oblique shadow area is the waste discharge area, and the mesh shadow is the product area, which is the area that needs to be retained.

[0042] The specific die-cutting and waste discharge processes all adopt existing technologies.

[0043] The present invention redesigns the structure of a single punching die and a double punching die. The single punching die is composed of a first internal knife line 1 and a second internal knife line 2 of the same shape, which are centrally symmetrically arranged and spaced apart; the double punching die is composed of a first external knife line 3 and a second external knife line 4 of the same shape, which are centrally symmetrically arranged and spaced apart. The first internal knife line 1 cooperates with the first external knife line 3, and the second internal knife line 2 cooperates with the second external knife line 4. After combined punching, a product is formed between the two, and the two products are centrally symmetrically arranged.

[0044] The present invention divides the product punching into two steps, and discharges waste in two steps, and discharges half of the waste in each step, thus avoiding the problem of sheet drop and product deformation caused by discharging the waste of the overall contour, and half of the waste is discharged in the first punching and the second punching, and the waste is connected, which is convenient for waste discharge and avoids the problem of sheet drop and deformation.

[0045] 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 cutter assembly for punching L-shaped Mylar double-sided adhesive products, the die cutter assembly comprising a first punch die for punching the inner edge contour of the product, and a second punch die for punching the outer L-shaped edge contour of the product, characterized in that: The first punching die is composed of a first internal knife line and a second internal knife line of the same shape, and the second punching die is composed of a first external knife line and a second external knife line of the same shape; The first internal knife line and the second internal knife line are centrally symmetrically arranged and spaced apart; The first external knife line and the second external knife line are centrally symmetrically arranged and spaced apart, and the two are assembled into a rectangular frame; The first internal knife line cooperates with the first external knife line, and after combined punching, a product is formed between the two; The second inner knife line cooperates with the second outer knife line, and after combined punching, another product is formed between the two; The distance between the first inner cut line and the second inner cut line is 2-3 times the width of the product corner; The first punching die and the second punching die are provided in multiple groups and arranged in a line.

2. A die cutter assembly for punching L-shaped Mylar double-sided adhesive products according to claim 1, characterized in that: The product includes Mylar and double-sided adhesive adhered to the Mylar. The product is in the shape of an L-shaped sheet, including an external L-shaped edge and an internal rounded arc edge.

3. A die cutter assembly for punching L-shaped Mylar double-sided adhesive products according to claim 2, characterized in that: The corner width of the product is 0.8-1.5 mm.

4. A die cutter assembly for punching L-shaped Mylar double-sided adhesive products according to claim 3, characterized in that: The thickness of the double-sided tape is 0.05-0.15 mm, and the thickness of the Mylar tape is 0.1-0.2 mm.

5. A die cutter assembly for punching L-shaped Mylar double-sided adhesive products according to claim 2, characterized in that: The contours of the first internal knife line and the second internal knife line are consistent with the shape of the internal edge contour line of the product, and the lengths of the first internal knife line and the second internal knife line are greater than the internal edge contour line of the product, and protruding curved arc knife lines are provided at both ends.

6. A die cutter assembly for punching L-shaped Mylar double-sided adhesive products according to claim 1, characterized in that: The distance between the first outer knife line and the second outer knife line is smaller than the distance between the first inner knife line and the second inner knife line.

7. A die cutter assembly for punching L-shaped Mylar double-sided adhesive products according to any one of claims 1 to 6, characterized in that: The first punching die and the second punching die are both arranged on the punching die of the die-cutting device and are both convex blades.

8. A punching method for L-shaped Mylar double-sided adhesive products, characterized in that: The die cutting method according to claim 7 is carried out by punching, which specifically comprises the following steps: (1) The raw material strip with the carrier film, double-sided adhesive tape and auxiliary release film is passed through a die-cutting machine and continuously punched through a punching die to punch out the internal contour of the product; (2) Remove the auxiliary release film and the internal waste between the pair of products, attach a new auxiliary release film, and perform continuous punching through the two-punch die to punch out the outer contour of the product; (3) After removing the auxiliary release film and the external waste of the product, the finished product is obtained.

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