Circular knife die, die cutting system and die cutting method for producing base-material-free high-extension thick foam

Abstract

The invention relates to a circular knife die, a die cutting system and a die cutting method for producing base-material-free high-extension thick foam. The circular knife die comprises a first upper die cutting knife holder, the first upper die cutting knife holder comprises a first upper die cutting knife holder body and a plurality of first knife lines, the first knife lines are in a cross shape, and every two adjacent first knife lines are connected with each other; a first lower die cutter holder; the second upper die cutter holder comprises a second upper die cutter holder body and a plurality of second cutter lines, and the second cutter lines are two rectangular cutter lines which are oppositely arranged; the second lower die-cutting tool apron is matched with the second upper die-cutting tool apron; a cross-shaped product pre-cutting line is formed on the foam through die cutting by the first knife line, and then rectangular products which are symmetrical in the horizontal direction and the vertical direction of the cross-shaped product pre-cutting line are formed on the foam through die cutting by the second knife line. Compared with the prior art, the production efficiency of the substrate-free high-elongation thick foam is improved, the labor cost is saved, and the reject ratio of production is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of die cutting, and in particular relates to a round knife die, a die cutting system and a die cutting method for producing a substrate-free high-extension thick foam. Background Art

[0002] For current die-cut products in the electronics industry, since the substrate-free foam material has high resilience and high ductility, it is better suitable for attaching to the sealed irregular planes of electronic products, and can more efficiently meet the bonding requirements for structural components that need to be sealed against water and dust, achieving more comprehensive high-reliability bonding needs. At the same time, a substrate-free double-sided colloid (a glue layer without PET and cotton paper carriers, with extremely easy flow and suitable for bonding in complex environments of various curved surfaces) is also used.

[0003] For traditional die-cutting tools, in the die cutting of the combined material of substrate-free foam and substrate-free glue, with the flat knife production method, there are many processes and the speed is slow. The finished product cannot be produced at one time, and the tolerance change of the foam deformation during the process is relatively large, up to ±0.15 mm.

[0004] Due to the characteristics of this thick foam, it is easy to be calendered and has a large deformation amount. Only the flat knife up-and-down die cutting production method can control the deformation amount, and the speed is slow. If the conventional round knife wire production method of a round knife machine is used, the deformation amount of the produced finished product is larger than that of the flat knife, and the corresponding deformation tolerance reaches 0.3 MM. The round knife method is not used in the industry, unless the customer accepts a tolerance of ±0.3. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a round knife die, a die cutting system and a die cutting method for producing a substrate-free high-extension thick foam.

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

[0007] The first aspect of the present invention provides a round knife die for producing a substrate-free high-extension thick foam, including:

[0008] A first upper die-cutting knife seat, which includes a first upper die-cutting knife seat body and a plurality of first knife lines located on the upper surface of the first upper die-cutting knife seat body. The first knife lines are in a cross shape and adjacent two first knife lines are connected to each other;

[0009] A first lower die-cutting knife seat matching the first upper die-cutting knife seat;

[0010] A second upper die-cutting knife seat located at the next working station of the first lower die-cutting knife seat, which includes a second upper die-cutting knife seat body and a plurality of second knife lines located on the upper surface of the second upper die-cutting knife seat body. The second knife lines are two relatively arranged rectangular knife lines;

[0011] And a second lower die-cutting tool holder that matches the second upper die-cutting tool holder;

[0012] During die-cutting, the first cutting line cuts out a cross-shaped product pre-cut line on the foam, and then the second cutting line cuts out a rectangular product symmetrically along the horizontal and vertical directions of the cross-shaped product pre-cut line on the foam.

[0013] Further, the bottom of the cross-section of the second cutting line along the direction perpendicular to the upper surface of the first upper die-cutting tool holder body is triangular;

[0014] The triangle includes a first hypotenuse and a second hypotenuse connected to the first hypotenuse. The angle between the first hypotenuse and the direction perpendicular to the upper surface of the second upper die-cutting tool holder body is 15 - 30°, and the angle between the second hypotenuse and the first hypotenuse is 2 - 10°.

[0015] Further, the first upper die-cutting tool holder body is a cylinder, and the first cutting line is arranged on the curved surface of the cylinder.

[0016] Further, the second upper die-cutting tool holder body is a cylinder, and the second cutting line is arranged on the curved surface of the cylinder.

[0017] In the second aspect of the present invention, a die-cutting system includes:

[0018] A first feeding component for feeding out the foam;

[0019] A second feeding component for feeding out the double-sided tape;

[0020] A die-cutting component, which includes a round knife die-cutting machine. A round knife die for producing a substrate-free highly extensible thick foam as described above is installed on the round knife die-cutting machine. The round knife die-cutting machine includes a first die-cutting station and a second die-cutting station behind the first die-cutting station. The first upper die-cutting tool holder and the first lower die-cutting tool holder are installed at the first die-cutting station, and the second upper die-cutting tool holder and the second lower die-cutting tool holder are installed at the second die-cutting station;

[0021] A waste discharging component for discharging the waste after die-cutting by the first cutting line and the second cutting line; and

[0022] A finished product winding component for winding the products.

[0023] Further, the first feeding component includes a first feeding roller and a first feeding roller driving motor connected to the first feeding roller. The first feeding roller driving motor controls the first feeding roller to feed out the foam.

[0024] Further, the second feeding assembly includes a second feeding roller and a second feeding roller driving motor connected to the second feeding roller. The second feeding roller driving motor controls the second feeding roller to send out double-sided tape, and forms a composite layer structure of "foam-double-sided tape" with the tape from top to bottom.

[0025] Further, the waste discharging assembly includes a waste discharging roller and a waste discharging roller driving motor connected to the waste discharging roller. The waste discharging roller driving motor controls the waste discharging roller to discharge the waste after die-cutting by the first knife line and the second knife line.

[0026] Further, the finished product winding assembly includes a finished product winding roller and a finished product winding roller driving motor connected to the finished product winding roller.

[0027] The third aspect of the present invention provides a die-cutting method, which is executed by using the above-mentioned die-cutting system, and includes the following steps:

[0028] S1: The first feeding roller driving motor controls the first feeding roller to send out foam, and the second feeding roller driving motor controls the second feeding roller to send out double-sided tape, and forms a composite layer structure of "foam-double-sided tape" with the tape from top to bottom;

[0029] S2: Then, the first knife line in the die-cutting assembly cuts the composite layer structure, and the cutting depth satisfies that the foam in the composite layer is not cut off. Then, the second knife line in the die-cutting assembly cuts the composite layer structure again, and the cutting depth satisfies that the composite layer is cut off;

[0030] S3: Then, the waste discharging roller driving motor controls the waste discharging roller to discharge the waste after die-cutting by the first knife line and the second knife line;

[0031] S4: Finally, the finished product winding roller driving motor controls the finished product winding roller to wind the die-cut composite layer structure.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) By combining the first knife line and the second knife line, the present invention can perform die-cutting with a round knife, and the processed foam meets the accuracy requirements, realizing the feasibility of the round knife.

[0034] (2) By solving the round knife blade angle and knife line design, the present invention achieves the round knife process production, and further improves the production capacity to 2 times.

[0035] (3) Compared with the flat knife production, the present invention saves labor costs and process defects. The bevel design of the second knife line greatly reduces the depression around the processed foam products. Description of the Drawings

[0036] Figure 1 Schematic diagram of the second knife line for die-cutting the foam in Embodiments 1 to 3.

[0037] Figure 2 Schematic diagram of the first knife line in Embodiment 1.

[0038] Figure 3 Schematic diagram of the second knife line in Embodiment 1.

[0039] Figure 4 Schematic diagram of the combination of the first knife line and the second knife line in Embodiment 1.

[0040] Figure 5 Schematic diagram of the die-cutting system in Embodiment 2.

[0041] Figure 6 Schematic diagram of the foam product die-cut by the present invention.

[0042] Reference numerals in the figure:

[0043] 100 - First knife line, 200 - Second knife line, 300 - First hypotenuse, 400 - Second hypotenuse, 1 - First upper die-cutting knife seat, 2 - First lower die-cutting knife seat, 3 - Second upper die-cutting knife seat, 4 - Second lower die-cutting knife seat, 5 - First feeding assembly, 6 - Second feeding assembly, 7 - Waste discharging assembly, 8 - Finished product winding assembly. Detailed implementation manners

[0044] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0045] In the technical solution of the present invention, features such as component models, material names, connection structures, and control methods that are not clearly described are regarded as common technical features disclosed in the prior art.

[0046] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0047] In the description of the present invention, the meaning of "a plurality of" is two or more, unless otherwise specifically defined. In addition, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a bolt connection or a welded connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be a communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In order to improve the production efficiency of substrate-free highly extensible thick foam, save labor costs, and reduce the defective rate of production, a first aspect of the present invention provides a round knife die for producing substrate-free highly extensible thick foam, and its structure can be seen in Figures 1 to 6 as shown, including:

[0049] A first upper die cutting knife seat 1, which includes a first upper die cutting knife seat body and a plurality of first knife lines 100 located on the upper surface of the first upper die cutting knife seat body. The first knife lines 100 are in a cross shape and two adjacent first knife lines 100 are connected to each other;

[0050] A first lower die cutting knife seat 2 that matches the first upper die cutting knife seat;

[0051] A second upper die cutting knife seat 3 located at the next station after the first lower die cutting knife seat, which includes a second upper die cutting knife seat body and a plurality of second knife lines 200 located on the upper surface of the second upper die cutting knife seat body. The second knife lines 200 are two relatively arranged rectangular knife lines;

[0052] And a second lower die cutting knife seat 4 that matches the second upper die cutting knife seat;

[0053] During die cutting, the first knife lines 100 die cut a cross-shaped product pre-cut line on the foam, and then the second knife lines 200 die cut rectangular products on the foam that are symmetric in the horizontal and vertical directions along the cross-shaped product pre-cut line.

[0054] In some specific embodiments, please refer to Figure 1 、 Figure 3 and Figure 4 as shown, the bottom of the cross-section of the second knife line 200 in the direction perpendicular to the upper surface of the first upper die cutting knife seat body is triangular;

[0055] The triangle includes a first hypotenuse 300 and a second hypotenuse 400 connected to the first hypotenuse 300. The angle a between the first hypotenuse 300 and the direction perpendicular to the upper surface of the second upper die cutting knife seat body is 15-30°, and the angle b between the second hypotenuse 400 and the first hypotenuse 300 is 2-10°.

[0056] In some specific embodiments, please refer to again Figure 5 as shown, the first upper die-cutting tool holder body is a cylinder, and the first cutting line 100 is arranged on the curved surface of the cylinder.

[0057] In some specific embodiments, please refer to again Figure 5 as shown, the second upper die-cutting tool holder body is a cylinder, and the second cutting line 200 is arranged on the curved surface of the cylinder.

[0058] The second aspect of the present invention provides a die-cutting system, and its structure is shown in Figure 5 as follows, including:

[0059] A first feeding component 5 for feeding out the foam;

[0060] A second feeding component 6 for feeding out the double-sided tape;

[0061] A die-cutting component, which includes a round knife die-cutting machine. A round knife die for producing a substrate-free highly extensible thick foam as described above is installed on the round knife die-cutting machine. The round knife die-cutting machine includes a first die-cutting station and a second die-cutting station behind the first die-cutting station. The first upper die-cutting tool holder 1 and the first lower die-cutting tool holder 2 are installed at the first die-cutting station, and the second upper die-cutting tool holder 3 and the second lower die-cutting tool holder 4 are installed at the second die-cutting station;

[0062] A waste discharging component 7 for discharging the waste after die-cutting of the first cutting line 100 and the second cutting line 200; and

[0063] A finished product winding component 8 for winding the product.

[0064] In some specific embodiments, please refer to again Figure 5 as shown, the first feeding component 5 includes a first feeding roller and a first feeding roller driving motor connected to the first feeding roller. The first feeding roller driving motor controls the first feeding roller to feed out the foam.

[0065] In some specific embodiments, please refer to again Figure 5 as shown, the second feeding component 6 includes a second feeding roller and a second feeding roller driving motor connected to the second feeding roller. The second feeding roller driving motor controls the second feeding roller to feed out the double-sided tape and form a "foam-double-sided tape" composite layer structure with the tape from top to bottom.

[0066] In some specific embodiments, please refer to again Figure 5As shown, the waste discharging assembly 7 includes a waste discharging roller and a waste discharging roller driving motor connected to the waste discharging roller. The waste discharging roller driving motor controls the waste discharging roller to discharge the waste after die-cutting of the first cutting line 100 and the second cutting line 200.

[0067] In some specific embodiments, please refer to Figure 5 As shown, the finished product winding assembly 8 includes a finished product winding roller and a finished product winding roller driving motor connected to the finished product winding roller.

[0068] The third aspect of the present invention provides a die-cutting method, which is executed by using the above die-cutting system, and includes the following steps:

[0069] S1: The first feeding roller driving motor controls the first feeding roller to send out the foam, and the second feeding roller driving motor controls the second feeding roller to send out the double-sided adhesive, and a composite layer structure of "foam - double-sided adhesive" is formed from top to bottom with the strip of material;

[0070] S2: Then, the first cutting line 100 in the die-cutting assembly cuts the composite layer structure, and the cutting depth satisfies that the foam in the composite layer is not cut off. Then, the second cutting line 200 in the die-cutting assembly cuts the composite layer structure again, and the cutting depth satisfies that the composite layer is cut off;

[0071] S3: Then, the waste discharging roller driving motor controls the waste discharging roller to discharge the waste after die-cutting of the first cutting line 100 and the second cutting line 200;

[0072] S4: Finally, the finished product winding roller driving motor controls the finished product winding roller to wind the die-cut composite layer structure.

[0073] Each of the above embodiments can be implemented alone, or can be combined in any pairwise or more combinations.

[0074] The following will further illustrate the above embodiments in conjunction with specific examples.

[0075] Embodiment 1

[0076] In order to improve the production efficiency of the substrate-free high-elongation thick foam, save labor costs, and reduce the defective rate of production, this embodiment provides a round knife die for producing the substrate-free high-elongation thick foam. Its structure is shown in Figures 1 to 2 As shown, it includes:

[0077] The first upper die-cutting knife holder 1, which includes a first upper die-cutting knife holder body and a plurality of first cutting lines 100 located on the upper surface of the first upper die-cutting knife holder body. The first cutting lines 100 are in a cross shape and two adjacent first cutting lines 100 are connected to each other;

[0078] The first lower die-cutting tool holder 2 that matches the first upper die-cutting tool holder;

[0079] The second upper die-cutting tool holder 3 located at the next working station after the first lower die-cutting tool holder, which includes a second upper die-cutting tool holder body and a plurality of second cutting lines 200 located on the upper surface of the second upper die-cutting tool holder body. The second cutting lines 200 are two relatively arranged rectangular cutting lines;

[0080] And the second lower die-cutting tool holder 4 that matches the second upper die-cutting tool holder;

[0081] During die-cutting, the first cutting line 100 die-cuts a cross-shaped product pre-cut line on the foam, and then the second cutting line 200 die-cuts a rectangular product symmetrically along the horizontal and vertical directions of the cross-shaped product pre-cut line on the foam.

[0082] Please refer to again Figure 1 、 Figure 3 and Figure 4 As shown, the bottom of the cross-section of the second cutting line 200 in the direction perpendicular to the upper surface of the second upper die-cutting tool holder body is triangular;

[0083] The triangle includes a first hypotenuse 300 and a second hypotenuse 400 connected to the first hypotenuse 300. The angle a between the first hypotenuse 300 and the direction perpendicular to the upper surface of the second upper die-cutting tool holder body is 30°, and the angle b between the second hypotenuse 400 and the first hypotenuse 300 is 10°.

[0084] Please refer to again Figure 5 As shown, the first upper die-cutting tool holder body is a cylinder, and the first cutting line 100 is provided on the curved surface of the cylinder.

[0085] Please refer to again Figure 5 As shown, the second upper die-cutting tool holder body is a cylinder, and the second cutting line 200 is provided on the curved surface of the cylinder.

[0086] The working principle of this embodiment is as follows:

[0087] This round knife die uses a two - time die - cutting method to enable the processing of substrate - free high - elongation thick foam using a round knife. In actual processing of this foam, a flat knife is often used. The flat knife uses upper and lower die - cutting, while the round knife is a rolling cut. The processing efficiency and production capacity can be doubled. However, during the processing of the foam edge, it is easy for the foam to be recessed by the knife line during die - cutting, resulting in a large number of defects. In this embodiment, a cross - shaped product line is first processed on the foam to be processed using the first knife line 100, causing the foam to be recessed downward around the cross - shape. Then, for the secondary die - cutting, the second knife line 200 is used to perform die - cutting along the vertical and horizontal directions of the cross - shape, cutting out a rectangular foam product. Since the first knife line 100 die - cuts the cross - shaped product line and causes it to be recessed downward and a part of the area around the cross - shaped product line bulges upward, and since the second knife line 200 performs die - cutting along the bulging part of the cross - shaped product line cut by the first knife line 100, the rectangular foam product punched out by the second knife line 200 returns to normal. The recess around the rectangular foam product after die - cutting is less, and the accuracy meets the requirements.

[0088] And the bottom of the cross - section of the second knife line 200 along the direction perpendicular to the upper surface of the first upper die - cutting knife seat body is triangular; the triangle includes a first hypotenuse 300 and a second hypotenuse 400 connected to the first hypotenuse 300. The angle a between the first hypotenuse 300 and the direction perpendicular to the upper surface of the second upper die - cutting knife seat body is 30°, and the angle b between the second hypotenuse 400 and the first hypotenuse 300 is 10°. This angle setting makes the recess around the rectangular foam product after die - cutting less. These two settings make the accuracy of the rectangular foam product after die - cutting meet the requirements.

[0089] Embodiment 2

[0090] This embodiment provides a die - cutting system, and its structure is shown in Figure 5 as follows, including:

[0091] A first feeding component 5 for feeding out the foam;

[0092] A second feeding component 6 for feeding out the double - sided tape;

[0093] A die - cutting component, which includes a round knife die - cutting machine. A round knife die for producing substrate - free high - elongation thick foam as described in any one of claims 1 - 4 is installed on the round knife die - cutting machine. The round knife die - cutting machine includes a first die - cutting station and a second die - cutting station located after the first die - cutting station. The first upper die - cutting knife seat 1 and the first lower die - cutting knife seat 2 are installed at the first die - cutting station, and the second upper die - cutting knife seat 3 and the second lower die - cutting knife seat 4 are installed at the second die - cutting station;

[0094] A waste - discharging component 7 for discharging the waste after die - cutting by the first knife line 100 and the second knife line 200; and

[0095] A finished - product winding component 8 for winding the products.

[0096] Please refer to again Figure 5 As shown, the first feeding component 5 includes a first feeding roller and a first feeding roller driving motor connected to the first feeding roller. The first feeding roller driving motor controls the first feeding roller to feed out the foam.

[0097] Please refer to again Figure 5 As shown, the second feeding component 6 includes a second feeding roller and a second feeding roller driving motor connected to the second feeding roller. The second feeding roller driving motor controls the second feeding roller to feed out the double-sided tape, and forms a "foam-double-sided tape" composite layer structure with the tape from top to bottom.

[0098] Please refer to again Figure 5 As shown, the waste discharging component 7 includes a waste discharging roller and a waste discharging roller driving motor connected to the waste discharging roller. The waste discharging roller driving motor controls the waste discharging roller to discharge the waste after die-cutting by the first cutting line 100 and the second cutting line 200.

[0099] Please refer to again Figure 5 As shown, the finished product winding component 8 includes a finished product winding roller and a finished product winding roller driving motor connected to the finished product winding roller.

[0100] The working process of this embodiment is as follows:

[0101] First, the first feeding roller driving motor controls the first feeding roller to feed out the foam. Then, the second feeding roller driving motor controls the second feeding roller to feed out the double-sided tape, and forms a "foam-double-sided tape" composite layer structure with the tape from top to bottom. Then, the first cutting line 100 performs a first die-cutting on the product, cutting out a cross-shaped product line on the foam product. Then, the second cutting line 200 performs a second die-cutting on the product, cutting out a rectangular product around the cross-shaped product line of the foam product. Then, the waste discharging roller driving motor controls the waste discharging roller to discharge the waste after die-cutting by the first cutting line 100 and the second cutting line 200, and the finished product winding roller driving motor controls the finished product winding roller to wind up the die-cut foam.

[0102] Embodiment 3

[0103] This embodiment provides a die-cutting method, which is executed by using a die-cutting system in Embodiment 2, and includes the following steps:

[0104] S1: The first feeding roller driving motor controls the first feeding roller to feed out the foam, and the second feeding roller driving motor controls the second feeding roller to feed out the double-sided tape, and forms a "foam-double-sided tape" composite layer structure with the tape from top to bottom;

[0105] S2: Next, the first cutting line 100 in the die-cutting assembly cuts the composite layer structure, and the cutting depth satisfies that the foam in the composite layer is not cut off. Then, the second cutting line 200 in the die-cutting assembly cuts the composite layer structure again, and the cutting depth satisfies that the composite layer is cut off;

[0106] S3: Next, the waste discharging roller driving motor controls the waste discharging roller to discharge the waste after die-cutting by the first cutting line 100 and the second cutting line 200;

[0107] S4: Finally, the finished product winding roller driving motor controls the finished product winding roller to wind the die-cut composite layer structure.

[0108] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and use the invention. 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 efforts. Therefore, the present invention is not limited to the above embodiments, and all improvements and modifications made by those skilled in the art without departing from the scope of the present invention according to the disclosure of the present invention should be within the protection scope of the present invention.

Claims

1. A round knife die for producing substrate-free high-extension thick foam, characterized in that, Comprising: A first upper die-cutting tool holder (1), which includes a first upper die-cutting tool holder body and a plurality of first cutting lines (100) located on the upper surface of the first upper die-cutting tool holder body. The first cutting lines (100) are in a cross shape and two adjacent first cutting lines (100) are connected to each other; A first lower die-cutting tool holder (2) matching the first upper die-cutting tool holder; A second upper die-cutting tool holder (3) located at a subsequent station of the first lower die-cutting tool holder, which includes a second upper die-cutting tool holder body and a plurality of second cutting lines (200) located on the upper surface of the second upper die-cutting tool holder body. The second cutting lines (200) are two rectangular cutting lines arranged opposite to each other; And a second lower die-cutting tool holder (4) matching the second upper die-cutting tool holder; During die-cutting, the first cutting lines (100) die-cut cross-shaped product pre-cut lines on the foam, and then the second cutting lines (200) die-cut rectangular products on the foam that are symmetric along the horizontal and vertical directions of the cross-shaped product pre-cut lines.

2. The circular knife die for producing substrate-free high-elongation thick foam according to claim 1, wherein The bottom of the cross-section of the second cutting line (200) along the direction perpendicular to the upper surface of the first upper die-cutting tool holder body is triangular; The triangle includes a first hypotenuse (300) and a second hypotenuse (400) connected to the first hypotenuse (300). The angle (a) between the first hypotenuse (300) and the direction perpendicular to the upper surface of the second upper die-cutting tool holder body is 15 - 30°, and the angle (b) between the second hypotenuse (400) and the first hypotenuse (300) is 2 - 10°.

3. The round knife die for producing substrate-free high-elongation thick foam according to claim 1, wherein, The first upper die-cutting tool holder body is a cylinder, and the first cutting lines (100) are provided on the curved surface of the cylinder.

4. The circular knife die for producing substrate-free high-extension thick foam according to claim 1, wherein The second upper die-cutting tool holder body is a cylinder, and the second cutting lines (200) are provided on the curved surface of the cylinder.

5. A die-cutting system, characterized in that, Comprising: A first feeding component (5) for feeding out foam; A second feeding component (6) for feeding out double-sided tape; A die-cutting component, which includes a round knife die-cutting machine. A round knife die for producing substrate-free high-extension thick foam as described in any one of claims 1 - 4 is installed on the round knife die-cutting machine. The round knife die-cutting machine includes a first die-cutting station and a second die-cutting station located after the first die-cutting station. The first upper die-cutting tool holder (1) and the first lower die-cutting tool holder (2) are installed at the first die-cutting station, and the second upper die-cutting tool holder (3) and the second lower die-cutting tool holder (4) are installed at the second die-cutting station; A waste discharging component (7) for discharging the waste after die-cutting of the first cutting lines (100) and the second cutting lines (200); and A finished product winding component (8) for winding the products.

6. A die-cutting system according to claim 5, wherein, The first feeding component (5) includes a first feeding roller and a first feeding roller driving motor connected to the first feeding roller. The first feeding roller driving motor controls the first feeding roller to feed out foam.

7. A die-cutting system according to claim 5, wherein, The second feeding component (6) includes a second feeding roller and a second feeding roller driving motor connected to the second feeding roller. The second feeding roller driving motor controls the second feeding roller to feed out double-sided tape and forms a composite layer structure of "foam - double-sided tape" with the tape from top to bottom.

8. A die-cutting system according to claim 5, characterized in that The waste discharging assembly (7) includes a waste discharging roller and a waste discharging roller driving motor connected to the waste discharging roller. The waste discharging roller driving motor controls the waste discharging roller to discharge the waste after die-cutting of the first knife line (100) and the second knife line (200).

9. A die-cutting system according to claim 5, wherein The finished product winding assembly (8) includes a finished product winding roller and a finished product winding roller driving motor connected to the finished product winding roller.

10. A die-cutting method, which is executed by using a die-cutting system as described in any one of claims 5-9, characterized in that, It includes the following steps: S1: The first feeding roller driving motor controls the first feeding roller to feed out the foam, and the second feeding roller driving motor controls the second feeding roller to feed out the double-sided adhesive, and a composite layer structure of "foam - double-sided adhesive" is formed from top to bottom with the material tape; S2: Then, the composite layer structure is cut by the first knife line (100) in the die-cutting assembly, and the cutting depth satisfies that the foam in the composite layer is not cut off. Then, the composite layer structure is cut again by the second knife line (200) in the die-cutting assembly, and the cutting depth satisfies that the composite layer is cut off; S3: Then, the waste discharging roller driving motor controls the waste discharging roller to discharge the waste after die-cutting of the first knife line (100) and the second knife line (200); S4: Finally, the finished product winding roller driving motor controls the finished product winding roller to wind up the die-cut composite layer structure.

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