Die cutting bottom die and die cutting assembly for thin plate packaging box

Abstract

The utility model relates to the field of die cutting machining, and particularly discloses a die cutting bottom die and a die cutting assembly for a thin plate packaging box. The die cutting bottom die comprises a base plate, cutter lines and an indentation groove are arranged on the base plate, the groove wall of the indentation groove comprises an end wall located at the end, the end wall comprises a first plane segment, and the first segment is parallel to the corresponding cutter line. According to the die cutting bottom die, the end space of the indentation groove can be effectively released, the distance between the end of the indentation piece and the end of the indentation groove during die cutting is reduced, and therefore the distance between an indentation on a packaging box and the cutting edge after die cutting is completed is reduced, and the packaging box forming quality is improved.

Description

Technical Field

[0001] The utility model relates to the field of die-cutting processing, in particular to a die-cutting bottom die and a die-cutting component for a thin plate packaging box. Background Art

[0002] Thin sheet packaging is a common commodity packaging box, commonly used for packaging small commodities such as food, cigarettes, and toys. It usually has a pattern printed on one side for display on the outside of the packaging. During production and processing, thin sheet packaging boxes are first printed in a flat form. After printing, they are cut into specific shapes and then folded into boxes for packaging. The cutting step is usually performed by die-cutting, that is, the paper is placed on a steel base mold and cut by pressing down with a knife die. During production and processing, thin sheet packaging boxes are usually pressed with crease lines in specific areas. When used, they are folded according to the crease lines to form boxes for packaging. Die-cutting and crease-pressing operations are usually performed simultaneously.

[0003] The Chinese utility model patent with authorization announcement number CN 202480432U discloses a die-cutting die for cigarette packaging boxes, including a plate-like base and a die-cutting blade and a creasing sheet arranged on the base and perpendicular to the plane where the base is located. The die-cutting blade and the creasing sheet are embedded in the sheet groove of the base, and the above-mentioned die can simultaneously complete the die-cutting and creasing line operations. During processing, the above-mentioned die-cutting die is usually used in conjunction with a base mold, wherein the base mold is usually made of metal materials such as stainless steel, and a cutting line and a creasing groove are provided on the base mold, wherein the cutting line is arranged corresponding to the die-cutting blade, and the creasing groove is arranged corresponding to the creasing sheet. It should be noted that the above-mentioned cutting line is usually a plane, that is, the die-cutting blade and the planar cutting line on the base mold jointly extrude and apply shear force to cut the packaging box. The cutting line can be understood as a virtual contour line that matches the die-cutting blade.

[0004] To ensure the continuity of shear force during the die-cutting process, improve the cutting effect and the quality of the trimmed edge of the packaging box, the cutting line must be set continuously. In other words, the indentation groove cannot extend to connect with the cutting line. Taking into account factors such as the thickness of the die-cutting blade and the die-cutting deformation zone of the packaging box material during the die-cutting process, the distance between the end of the indentation groove and the cutting edge of the die-cutting blade (i.e., the cutting line, which is also the trimmed edge of the packaging box after die-cutting) should be no less than 0.3mm. This will inevitably result in the indentation line not being able to pass through the packaging box after die-cutting, which will have a certain impact on the subsequent box packaging operation and box quality.

[0005] like Figure 1As shown, taking the die-cutting bottom die of a cigarette packaging box as an example, the width of the indentation groove is 1.1mm, and the distance between the end of the indentation groove and the cutting line is 0.3mm. The indentation groove is formed by a 1.1mm milling cutter, and the end of the indentation groove is arc-shaped, corresponding to the thickness of the indentation sheet of 0.8~1mm. Since the indentation sheet is usually formed by cutting a metal sheet, the end of the indentation sheet is usually a plane. Due to the limitations of thickness and end shape, the end of the indentation sheet cannot completely fit with the end of the indentation groove, so the processing size of the indentation sheet needs to be slightly shorter than the length of the indentation groove, and the final indentation length will also be shorter, and the distance between the end of the indentation and the cutting edge will also be slightly larger. Taking the size of the above-mentioned die-cutting die as an example, the distance between the end of the indentation and the cutting edge is not less than 0.75mm, that is, Figure 1 The distance S1 is much larger than the distance between the end of the indentation groove and the cutting line, that is, Figure 1 The distance shown by L in the figure still has room for improvement. Summary of the Invention

[0006] The technical problem to be solved by the utility model is to provide a die-cutting bottom die for thin plate packaging boxes, which can effectively release the end space of the indentation groove and reduce the distance between the end of the indentation sheet and the end of the indentation groove during die-cutting, thereby reducing the distance between the indentation on the packaging box and the cutting edge after the die-cutting is completed, thereby improving the quality of the packaging box.

[0007] In order to solve the above technical problems, the technical solution provided by the utility model is as follows: a die-cutting bottom mold for a thin plate packaging box, comprising a substrate, a cutting line and an indentation groove being provided on the substrate, the groove wall of the indentation groove comprising an end wall located at the end, the end wall comprising a first planar segment, and the first segment being arranged parallel to the corresponding cutting line.

[0008] Compared to conventional arc-shaped end walls, making at least part of the end wall flat frees up space at the end of the indentation groove, allowing the indentation sheet to better fit into the end of the groove. This increases the length of the corresponding indentation sheet, allowing for better fit within the groove, thus increasing the effective length of the groove. While maintaining the same distance between the end of the indentation groove and the cutting line, after the box is processed, the distance between the indentation end and the cutting edge is reduced, improving the quality of the subsequent packaging.

[0009] Preferably, the groove wall of the indentation groove further includes lateral walls on both sides, the first segment and the lateral walls are connected via a second segment having an arc surface, and the curvature radius of the second segment is set to be no greater than 0.15 mm.

[0010] Preferably, the indentation groove includes a main body and a lateral extension portion, the lateral extension portion is located at the end of the main body and extends toward both sides of the main body along the extension direction of the corresponding cutting line, forming a first segment between the two lateral extension portions located at the same end of the indentation groove.

[0011] Preferably, the extension length of each of the lateral extension portions is not less than the width of the indentation groove.

[0012] A die-cutting assembly for thin plate packaging boxes includes a die-cutting die and a die-cutting bottom die. The die-cutting die is provided with a die-cutting blade and a creasing sheet, and the die-cutting bottom die is provided with a cutting line and a creasing groove. The die-cutting blade is arranged correspondingly to the cutting line, and the creasing sheet is arranged correspondingly to the creasing groove. The die-cutting bottom die is the die-cutting bottom die described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a partial enlarged view of the existing die-cutting bottom die;

[0014] Figure 2 Schematic diagram of the structure of the die-cutting bottom die for the thin plate packaging box in this embodiment;

[0015] Figure 3 for Figure 2 A partial enlarged view of point A in the middle, wherein the indentation groove is as described in Example 1 below;

[0016] Figure 4 This is a partial enlarged view of the die-cutting bottom mold in Example 2. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Example

[0018] like Figure 2 and 3 As shown, a die-cutting bottom die for thin-plate packaging boxes includes a base plate, on which a cutting line 2 and an indentation groove 1 are provided. The groove wall of the indentation groove 1 includes an end wall located at the end, and the end wall includes a planar first segment 11. The first segment 11 is arranged parallel to the corresponding cutting line 2.

[0019] like Figure 2 and 3 As shown, specifically, the groove wall of the indentation groove 1 also includes lateral walls 13 located on both sides, and the first segment 11 is connected to the lateral walls 13 through a second segment with an arc surface, and the curvature radius of the second segment is set to be no more than 0.15 mm.

[0020] Compared to conventional arc-shaped end walls, making at least part of the end wall flat frees up space at the end of the indentation groove 1, allowing the indentation sheet 14 to better fit into the end of the indentation groove 1. Consequently, the length of the indentation sheet 14 can be appropriately increased, allowing it to better fit the indentation groove 1, thereby increasing the effective length of the indentation groove 1. While maintaining the same distance from the end of the indentation groove 1 to the cutting line 2, after the packaging box is processed, the distance from the indentation end to the cutting edge is reduced, improving the quality of the subsequent packaging.

[0021] For example, if the width of the indentation groove 1 is 1.1mm and the distance between the end of the indentation groove 1 and the cutting line 2 is 0.3mm, after processing, the distance between the indentation on the packaging box and the cutting edge is no more than 0.5mm, that is, Figure 3 The distance shown by S2 is much smaller than the existing processing bottom mold to edge distance of not less than 0.75mm, and the processing quality is significantly improved.

[0022] It should be noted that the indentation groove 1 in the die-cutting steel die of the present application can be carved by a tool with a tip radius not greater than 0.1 mm, which can ensure the curvature radius of the second segment. Example

[0023] Compared with the first embodiment, the difference of this embodiment is that: Figure 4 As shown, the indentation groove 1 includes a main body and lateral extensions 12. The lateral extensions 12 are located at the ends of the main body and extend toward both sides of the main body along the extension direction of the corresponding cutting line 2. The first segment 11 is formed between the two lateral extensions 12 located at the same end of the indentation groove 1. Specifically, the extension length of each lateral extension 12 is not less than the width of the indentation groove 1.

[0024] Compared with the first embodiment, by providing the lateral extension portion 12, the same level of processing quality is achieved. Figure 4 On the basis of the distance to the edge shown in S3, the difficulty of processing the indentation groove 1 can be reduced, and it can be achieved by changing the tool path using existing conventional tools. Example

[0025] A die-cutting assembly for a thin plate packaging box comprises a die-cutting die and a die-cutting base die, wherein the die-cutting die is provided with a die-cutting blade and an indentation sheet 14, and the die-cutting base die is provided with a cutting line 2 and an indentation groove 1, wherein the die-cutting blade is arranged corresponding to the cutting line 2, and the indentation sheet 14 is arranged corresponding to the indentation groove 1; wherein the die-cutting base die is the die-cutting base die as described in Example 1 or Example 2.

[0026] In short, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A die-cutting bottom die for a thin plate packaging box, comprising a base plate, wherein the base plate is provided with a cutting line and an indentation groove, and wherein: The groove wall of the indentation groove includes an end wall located at the end, and the end wall includes a first segment in a plane. The first segment is arranged parallel to the corresponding cutting line.

2. The die-cutting bottom mold according to claim 1, characterized in that: The groove wall of the indentation groove also includes lateral walls located on both sides. The first segment and the lateral walls are connected by a second segment with an arc surface. The curvature radius of the second segment is set to be no greater than 0.15 mm.

3. The die-cutting bottom mold according to claim 1, characterized in that: The indentation groove includes a main body and a lateral extension portion. The lateral extension portion is located at the end of the main body and extends toward both sides of the main body along the extension direction of the corresponding cutting line. A first segment is formed between the two lateral extension portions at the same end of the indentation groove.

4. The die-cutting bottom mold according to claim 3, characterized in that: The extension length of each of the lateral extension portions is not less than the width of the indentation groove.

5. A die-cutting assembly for sheet packaging boxes, comprising a die-cutting die and a die-cutting base die, wherein the die-cutting die is provided with a die-cutting blade and a creasing sheet, and the die-cutting base die is provided with a cutting line and a creasing groove, wherein the die-cutting blade is provided corresponding to the cutting line, and the creasing sheet is provided corresponding to the creasing groove; Its characteristics are: The die-cutting bottom mold is the die-cutting bottom mold according to any one of claims 1 to 4.

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