Packaging paper, die cutter, die cutting apparatus, and packaging paper die cutting method

Abstract

The application relates to the technical field of packaging paper die-cutting, in particular to packaging paper, a die-cutting cutter, a die-cuting device and a packaging paper die-cutting method. The packaging paper is provided with an indentation line and a cutting line. At least two indentation lines form a T-shaped indentation line on the packaging paper. An L-shaped cutting line is arranged at the intersection of the T-shaped indentation line. The L-shaped cutting line comprises a main cutting line and a force-releasing cutting line. One end of the force-releasing cutting line is connected perpendicularly to one end of the main cutting line. The force-releasing cutting line extends to the edge of the packaging paper by a preset distance. When the packaging paper is folded, the folding stress is guided to the L-shaped corner area. The shear stress peak accumulated along the direction of the main cutting line is decomposed into two perpendicular components after encountering the vertical interface of the force-releasing cutting line. The decomposition changes the stress trajectory, avoids the stress accumulation along a single direction, and provides an additional release path by the preset distance of the force-releasing cutting line extending to the edge, thereby effectively inhibiting the occurrence of endpoint tearing.

Description

Technical Field

[0001] This application relates to the field of packaging paper die-cutting technology, and more specifically, to packaging paper, die-cutting blades, die-cutting equipment, and packaging paper die-cutting methods. Background Technology

[0002] Currently, hard-pack cigarette packaging generally uses sheet-printed cigarette labels that are then die-cut, creasing, and folded into shape using rolling packaging equipment. In existing die-cutting processes, the cutting paths at the four ends of the back of the cigarette pack are usually straight lines or simple right-angle transitions.

[0003] When the rolling equipment squeezes and folds the cigarette pack, these four end points will bear stress from multiple directions (including folding pressure and forming tension), and the paper fibers are prone to tearing along the direction of the knife marks.

[0004] Actual production shows that almost all hard-pack cigarette packs have varying degrees of tearing at the four ends on the back. The tear length is generally between 2mm and 5mm. Especially on dark-colored cigarette packs (such as black, dark blue, and dark red), the exposed white paper fibers at the tears are extremely glaring and seriously affect the product's appearance. Traditional die-cutting structures are not optimized for the folding stress path, and relying solely on the paper's own toughness cannot effectively suppress end-point tearing. For a long time, there has been a lack of reliable solutions, which has become a technical pain point restricting the improvement of cigarette pack packaging quality and is a recognized process pain point in the cigarette pack printing and packaging industry.

[0005] Existing technologies mainly mitigate the tearing effect by improving the tear resistance of the paper itself (such as increasing basis weight or using high-strength fiber paper) or adjusting the pressure parameters of the wrapping equipment. However, these methods either significantly increase material costs or reduce packaging efficiency and cannot eliminate the tearing caused by stress concentration. Summary of the Invention

[0006] The purpose of this application is to provide a packaging paper, a die-cutting knife, a die-cutting device, and a method for die-cutting packaging paper, which are used to solve at least one technical problem mentioned in the background art.

[0007] To achieve the above objectives, in a first aspect, this application provides packaging paper, on which crease lines and cutting lines are provided, at least two of the crease lines forming a T-shaped crease line on the packaging paper, and an L-shaped cutting line is provided at the intersection of the T-shaped crease lines, the L-shaped cutting line including a main cutting line and a stress-relieving cutting line, one end of the stress-relieving cutting line being perpendicularly connected to one end of the main cutting line, and the stress-relieving cutting line extending a predetermined distance toward the edge of the packaging paper.

[0008] In an optional implementation, the preset distance is A, where 1mm ≤ A ≤ 1.5mm.

[0009] In an optional embodiment, a rounded chamfer is provided at the connection between the main cutting line and the unloading cutting line, and the radius of the rounded chamfer is R2, wherein 0.2mm≤R2≤0.8mm.

[0010] Secondly, this application also provides a die-cutting blade, including: Main body; The stress-relieving part is vertically connected to one end of the main body and forms an L-shaped die-cutting blade with the main body.

[0011] In an optional embodiment, the length of the stress-relieving part along the first direction is A, wherein 1mm≤A≤1.5mm; And / or, a rounded corner structure is provided at the connection between the main body and the unloading part, and the radius of the rounded corner structure is R1, wherein 0.2mm≤R1≤0.8mm.

[0012] Thirdly, this application also provides die-cutting equipment, including a die-cutting blade as described in the foregoing embodiments.

[0013] Fourthly, this application also provides a method for die-cutting packaging paper, including: Unfold and lay the wrapping paper flat; Crease lines are made on the packaging paper, and at least two crease lines form a T-shaped crease line on the packaging paper; Cutting lines are made on the packaging paper, wherein an L-shaped cutting line is cut at the intersection of the T-shaped crease lines. The L-shaped cutting line includes a main cutting line and a stress-relieving cutting line. One end of the stress-relieving cutting line is perpendicularly connected to one end of the main cutting line, and the stress-relieving cutting line extends a predetermined distance toward the edge of the packaging paper.

[0014] In an optional implementation, the preset distance is A, where 1mm ≤ A ≤ 1.5mm.

[0015] In an optional embodiment, a rounded chamfer is provided at the connection between the main cutting line and the unloading cutting line, and the radius of the rounded chamfer is R2, wherein 0.2mm≤R2≤0.8mm.

[0016] Fifthly, this application also provides packaging paper, which is made using the packaging paper die-cutting method described in any of the foregoing embodiments.

[0017] The packaging paper provided in this application features an L-shaped cut line consisting of a main cut line and a stress-relieving cut line. When the packaging paper is folded, the folding stress is directed to the L-shaped corner area. The peak shear stress originally accumulated along the main cut line is decomposed into two mutually perpendicular components upon encountering the vertical interface of the stress-relieving cut line: one extends along the main cut line, and the other disperses towards the edge along the stress-relieving cut line. This decomposition alters the stress trajectory, preventing stress accumulation in a single direction. Simultaneously, the predetermined distance of the stress-relieving cut line extending towards the edge provides an additional release path. Compared to traditional die-cut structures with straight or right-angle transitions, this L-shaped design optimizes the stress path, dispersing concentrated shear stress into vertical components and reducing local stress peaks. This effectively suppresses end-point tearing without increasing material costs or reducing packaging efficiency.

[0018] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the structure of one embodiment of the packaging paper provided in this application; Figures 2 to 4 The diagrams show the stress at the end point of the packaging paper after it has been folded into a packaging box. Figure 5 A schematic diagram of the structure of the packaging paper provided in this application after being folded into a packaging box; Figure 6 A schematic diagram of the structure of one embodiment of the die-cutting knife provided in this application; Figure 7 This is a schematic diagram of another embodiment of the die-cutting tool provided in this application.

[0021] Figure label: 100 - Packaging paper; 110 - Crease line; 120 - T-shaped crease line; 130 - Cutting line; 140 - L-shaped cutting line; 142 - Main cutting line; 144 - Unloading cutting line; 146 - Rounded chamfer; 210 - First endpoint; 220 - Second endpoint; 230 - Third endpoint; 240 - Fourth endpoint; 300 - Die-cutting blade; 310 - Main body; 320 - Force-relieving part; 330 - Rounded corner structure. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] like Figure 1 As shown, in a first aspect, embodiments of this application provide a packaging paper 100, on which crease lines 110 and cutting lines 130 are provided. During production, crease lines 110 can be pressed into the packaging paper 100 using a steel wire, and cutting lines 130 can be pressed into the packaging paper 100 using a cutter. The packaging paper 100 is folded along the crease lines 110; the cutting lines 130 are used to cut a portion of the paper surface of the packaging paper 100.

[0026] The packaging paper 100 has multiple crease lines 110 on its surface, wherein at least two crease lines 110 form a T-shaped crease line 120 on the packaging paper 100, such as... Figure 1 As shown, there are four T-shaped crease lines 120. When the packaging paper 100 is folded to form a cuboid packaging box, the packaging box will form endpoints at the intersection of these T-shaped crease lines 120. In related technologies, these endpoints will tear at the paper surface due to the stress formed by the folding and squeezing of the packaging paper 100, resulting in unsightly packaging and defects.

[0027] In this application, the problem is solved by setting an L-shaped cutting line 140 at the intersection of the T-shaped crease lines 120. The L-shaped cutting line 140 includes a main cutting line 142 and a stress-relieving cutting line 144. One end of the stress-relieving cutting line 144 is perpendicularly connected to one end of the main cutting line 142, and the stress-relieving cutting line 144 extends a predetermined distance toward the edge of the packaging paper 100.

[0028] During production, a stress-relieving cutting line 144 is cut into the packaging paper 100 using a cutter; for example... Figure 1 As shown, the L-shaped cutting line 140 formed by the main cutting line 142 and the unloading cutting line 144, during the folding of the packaging paper 100, such as... Figure 2 and Figure 3 As shown, the folding stress originally transmitted along the T-shaped indentation line 120 is forcibly guided to the L-shaped corner area. In this area, the peak shear stress accumulated along the main cut line 142 is decomposed into two mutually perpendicular components when it encounters the vertical interface of the stress relief cut line 144: one extends along the main cut line 142, and the other disperses towards the edge of the wrapping paper 100 along the stress relief cut line 144. This decomposition changes the principal stress trajectory of the paper in the folding force direction, so that the tearing stress originally concentrated in a single direction at the end point no longer continues to accumulate along a straight path, but is dispersed to the transverse area defined by the stress relief cut line 144, thereby making the paper deform uniformly in this area and reducing tearing; while in related technologies, stress is concentrated on one paper surface, causing only that paper surface to deform, resulting in a large deformation difference between that paper surface and the adjacent paper surface, leading to obvious tearing.

[0029] Meanwhile, the predetermined distance by which the stress-relieving cut line 144 extends towards the edge of the packaging paper 100 provides an additional stress release path, which can absorb and buffer the stress generated by folding and squeezing to a certain extent, thereby avoiding excessive stress concentration at the endpoints. Compared with traditional die-cut structures with straight or right-angle transitions, this L-shaped design, through structured stress path optimization, ensures that when the packaging paper 100 is folded, the paper fibers at the endpoints no longer directly bear high shear stress in a single direction, but are dispersed through mutually perpendicular component forces, reducing local stress peaks. Thus, without increasing material costs or reducing packaging efficiency, it effectively suppresses endpoint tearing.

[0030] like Figure 1 As shown, in one embodiment, the preset distance is A, where 1mm≤A≤1.5mm.

[0031] For example, the preset distance A is 1 mm; in another embodiment, the preset distance A is 1.1 mm; in another embodiment, the preset distance A is 1.2 mm; in another embodiment, the preset distance A is 1.3 mm; in another embodiment, the preset distance A is 1.4 mm; and in another embodiment, the preset distance A is 1.5 mm. Within the range of 1 mm to 1.5 mm, the preset distance A can be selected according to the size of the packaging paper 100; the larger the size of the packaging paper 100, the larger the value of A.

[0032] In the L-shaped structure formed by the stress-relieving cut line 144 and the main cut line 142, the preset distance A extending from the stress-relieving cut line 144 to the edge of the packaging paper 100 determines the effective length of the stress dispersion path. When the packaging paper 100 is folded along the T-shaped crease line 120, the shear stress accumulated in the direction of the main cut line 142 needs to be diverted and absorbed through the transverse cut area defined by the stress-relieving cut line 144.

[0033] If the preset distance A is less than 1mm, the stress decomposition path perpendicular to the main cut line 142 provided by the stress relief cut line 144 is too short. The paper fibers in this area cannot fully convert the shear stress transmitted along the direction of the main cut line 142 into a component force perpendicular to this direction and diffuse it outward within a limited length. As a result, a high stress concentration value will remain at the intersection of the end of the stress relief cut line 144 and the main cut line 142. Consequently, during the folding process, there is a large deformation difference between the paper surface in the stress concentration area and the adjacent paper surface, which may cause tearing of the paper surface near the end point.

[0034] If the preset distance A is greater than 1.5mm, the cut formed by the unloading cutting line 144 on the packaging paper 100 will be more significant due to the increased length, forming visible cutting line marks on the surface of the folded packaging box (especially on dark cigarette packs), thus affecting the appearance quality of the product to some extent.

[0035] Therefore, by controlling the preset distance A within the range of 1mm to 1.5mm, two mutually restrictive factors can be balanced structurally: on the one hand, this length range is sufficient to allow the stress relief cutting line 144 to adequately divert and buffer the principal stress trajectory in the direction of the main cutting line 142, reducing the local stress peak in the stress concentration area to a level that is not likely to cause tearing; on the other hand, this length range will not make the cut of the stress relief cutting line 144 excessively prominent on the surface of the packaging paper 100, thereby effectively suppressing the occurrence of end tearing while maintaining the visual integrity of the packaging box surface.

[0036] To more evenly release the stress generated during the 100-fold folding of the packaging paper, such as Figure 1 and Figure 4As shown, in one embodiment, a rounded chamfer 146 is provided at the connection between the main cutting line 142 and the unloading cutting line 144. The radius of the rounded chamfer 146 is R2, wherein 0.2mm ≤ R2 ≤ 0.8mm. Figure 4 As shown, in this embodiment, the rounded chamfer 146 provided at the connection between the main cutting line 142 and the stress-relieving cutting line 144 further avoids secondary stress concentration.

[0037] For example, the radius R2 of the chamfer 146 is 0.2 mm; in another embodiment, the radius R2 of the chamfer 146 is 0.3 mm; in another embodiment, the radius R2 of the chamfer 146 is 0.4 mm; in another embodiment, the radius R2 of the chamfer 146 is 0.5 mm; in another embodiment, the radius R2 of the chamfer 146 is 0.6 mm; in another embodiment, the radius R2 of the chamfer 146 is 0.7 mm; in another embodiment, the radius R2 of the chamfer 146 is 0.8 mm.

[0038] like Figure 4 As shown, when 0.2mm ≤ R2 ≤ 0.8mm, the rounded chamfer 146 can provide a sufficiently long transition distance to alleviate the stress abrupt change between the main cutting line 142 and the stress-relieving cutting line 144. If R2 is less than 0.2mm, the curvature of the arc is too small, and the stress flow line still turns close to a right angle. The stress concentration at this connection point does not decrease significantly, and there is still a high risk of secondary tearing. If R2 is greater than 0.8mm, although the stress dispersion effect is better, the arc area will occupy a larger paper area, which may limit the cutting accuracy and production layout. Furthermore, the arc cut mark on the surface of the folded packaging box may be more obvious. Therefore, controlling R2 within the range of 0.2mm to 0.8mm can effectively disperse the local stress peak at the connection between the main cutting line 142 and the stress-relieving cutting line 144 into the arc path, thereby avoiding the generation of a new stress concentration point at this intersection to a certain extent, making the stress release process of the packaging paper 100 more uniform.

[0039] Figure 1 Four L-shaped cut lines 140 are shown on the wrapping paper 100, as follows: Figure 5As shown, after the packaging paper 100 is folded, its four ends correspond to four L-shaped cutting lines 140, namely the first end 210, the second end 220, the third end 230, and the fourth end 240. To verify the preferred dimensions of the preset distance A of the L-shaped cutting line 140 and the radius of the rounded chamfer 146, based on the minimum preset distance A of 1mm and the minimum radius R2 of the rounded chamfer 146 of 0.2mm, single-factor gradient tests of preset distance A dimensions (1.0mm, 1.5mm, 2.0mm, 2.5mm) were conducted on the packaging paper 100 of hard-pack cigarette brand A (195g / m2 white cardboard) and brand B (232g / m2 optical column transfer cardboard). The actual machine test results and test data are as follows:

[0040] Example 1: Cigarette brand A (preset distance A size gradient test).

[0041] Paper material: 195g / m2 white cardstock.

[0042] Experimental results and test data (average values):

[0043] Example 2: Cigarette brand B (preset distance A size gradient test).

[0044] Paper material: 232g / m2 transfer card.

[0045] Experimental results and test data (average values):

[0046] The test results of Examples 1 and 2 show that the preferred dimensions of the preset distance A for the stress-relieving cut line 144 of the L-shaped cut line 140 are 1.0 mm and 1.5 mm. Based on the structure of the L-shaped cut line 140, the right-angle corner is improved to a rounded chamfer 146, which can further disperse the stress at the folding position of the cigarette pack end and further improve the tear resistance of the cigarette pack end. Interactive tests were conducted on hard-pack cigarette brand A (195g / m2 white cardboard) and brand B (232g / m2 optical transfer cardboard) with preset distance A dimensions (1.0 mm, 1.5 mm) and rounded chamfer 146 dimensions (0.2 mm, 0.5 mm, 0.8 mm, 1.0 mm). The actual machine test results and test data are as follows:

[0047] Example 3: Cigarette brand A (preset distance A dimension, 146mm chamfer interactive test).

[0048] Paper material: 195g / m2 white cardboard.

[0049] Experimental results and test data (average values):

[0050] Example 4: Cigarette brand B (preset distance A, 146mm chamfered corner interactive test).

[0051] Paper material: 232g / m2 transfer card.

[0052] Experimental results and test data (average values):

[0053] like Figure 6 As shown, in a second aspect, embodiments of this application also provide a die-cutting blade 300, including a main body 310 and a stress-relieving part 320. The stress-relieving part 320 is vertically connected to one end of the main body 310 and forms an L-shaped die-cutting blade 300 with the main body 310. The packaging paper 100 produced using the die-cutting blade 300 provided in this embodiment will also possess the beneficial effects of the packaging paper 100 in the above embodiments. The main body 310 is used to cut the main cutting line 142 on the packaging paper 100, and the stress-relieving part 320 is used to cut the stress-relieving cutting line 144 on the packaging paper 100.

[0054] like Figure 6 As shown, in one embodiment, the length of the unloading part 320 along the first direction is A, where 1mm≤A≤1.5mm.

[0055] For example, the length A of the stress-relieving part 320 along the first direction is 1 mm; in another embodiment, the length A of the stress-relieving part 320 along the first direction is 1.1 mm; in another embodiment, the length A of the stress-relieving part 320 along the first direction is 1.2 mm; in another embodiment, the length A of the stress-relieving part 320 along the first direction is 1.3 mm; in another embodiment, the length A of the stress-relieving part 320 along the first direction is 1.4 mm; in another embodiment, the length A of the stress-relieving part 320 along the first direction is 1.5 mm.

[0056] like Figure 7 As shown, in one embodiment, a rounded corner structure 330 is provided at the connection between the main body 310 and the unloading part 320. The radius of the rounded corner structure 330 is R1, wherein 0.2mm≤R1≤0.8mm.

[0057] For example, the radius R1 of the rounded corner structure 330 at the connection between the main body 310 and the unloading part 320 is 0.2 mm; in another embodiment, the radius R1 of the rounded corner structure 330 at the connection between the main body 310 and the unloading part 320 is 0.3 mm; in another embodiment, the radius R1 of the rounded corner structure 330 at the connection between the main body 310 and the unloading part 320 is 0.4 mm; in another embodiment, the radius R1 of the rounded corner structure 330 at the connection between the main body 310 and the unloading part 320 is 0.5 mm; in another embodiment, the radius R1 of the rounded corner structure 330 at the connection between the main body 310 and the unloading part 320 is 0.6 mm; in another embodiment, the radius R1 of the rounded corner structure 330 at the connection between the main body 310 and the unloading part 320 is 0.7 mm; in another embodiment, the radius R1 of the rounded corner structure 330 at the connection between the main body 310 and the unloading part 320 is 0.8 mm.

[0058] Thirdly, embodiments of this application also provide die-cutting equipment, including the die-cutting blade 300 provided in any of the above embodiments.

[0059] The die-cutting equipment of this application uses the die-cutting blade 300 provided in this application. Other parts of the die-cutting equipment can adopt existing technology, which reduces the cost of equipment improvement, improves the efficiency of equipment improvement, and enhances the die-cutting quality of the packaging paper 100. The packaging paper 100 produced by the die-cutting equipment of this application will also have the same beneficial effects as the packaging paper 100 in the above embodiments.

[0060] Fourthly, embodiments of this application also provide a method for die-cutting packaging paper, including: S10: As Figure 1 As shown, unfold the wrapping paper 100 into a flat surface.

[0061] S20: As Figure 1 As shown, crease lines 110 are made on the packaging paper 100, and at least two crease lines 110 form a T-shaped crease line 120 on the packaging paper 100. Exemplarily, the crease lines 110 can be pressed onto the packaging paper 100 using a steel wire.

[0062] S22: As Figure 1 As shown, a cutting line 130 is cut on the packaging paper 100. An L-shaped cutting line 140 is cut at the intersection of the T-shaped crease line 120. The L-shaped cutting line 140 includes a main cutting line 142 and a stress-relieving cutting line 144. One end of the stress-relieving cutting line 144 is perpendicularly connected to one end of the main cutting line 142, and the stress-relieving cutting line 144 extends a predetermined distance toward the edge of the packaging paper 100.

[0063] Since the cut line 130 is applied after the crease line 110 is formed, the cut of the cut line 130 will sever the continuity of the paper fibers near the intersection of the crease lines 110. When the packaging paper 100 is folded along the T-shaped crease line 120, the shear stress transmission path that would originally be concentrated at the intersection is cut off by the cut structure of the L-shaped cut line 140, forcing the stress to be transmitted along the direction of the main cut line 142 to the vertical interface of the cut, and then dispersed towards the edge of the packaging paper 100 through the stress-relieving cut line 144. This can actively guide and redistribute the stress field that was originally concentrated at the T-shaped intersection, so that the stress no longer continues to accumulate in a single direction, but is decomposed into two component forces in the L-shaped corner area and released along different paths.

[0064] like Figure 1 As shown, in one embodiment, the preset distance is A, where 1mm≤A≤1.5mm.

[0065] For example, the preset distance A is 1 mm; in another embodiment, the preset distance A is 1.1 mm; in another embodiment, the preset distance A is 1.2 mm; in another embodiment, the preset distance A is 1.3 mm; in another embodiment, the preset distance A is 1.4 mm; and in another embodiment, the preset distance A is 1.5 mm. Within the range of 1 mm to 1.5 mm, the preset distance A can be selected according to the size of the packaging paper 100; the larger the size of the packaging paper 100, the larger the value of A.

[0066] like Figure 1 As shown, in one embodiment, a rounded chamfer 146 is provided at the connection between the main cutting line 142 and the unloading cutting line 144. The radius of the rounded chamfer 146 is R2, wherein 0.2mm≤R2≤0.8mm.

[0067] For example, the radius R2 of the chamfer 146 is 0.2 mm; in another embodiment, the radius R2 of the chamfer 146 is 0.3 mm; in another embodiment, the radius R2 of the chamfer 146 is 0.4 mm; in another embodiment, the radius R2 of the chamfer 146 is 0.5 mm; in another embodiment, the radius R2 of the chamfer 146 is 0.6 mm; in another embodiment, the radius R2 of the chamfer 146 is 0.7 mm; in another embodiment, the radius R2 of the chamfer 146 is 0.8 mm.

[0068] Fifthly, embodiments of this application also provide packaging paper 100, which is manufactured using the packaging paper die-cutting method as described in any of the above embodiments.

[0069] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0070] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. Packaging paper, characterized in that, The packaging paper is provided with crease lines and cutting lines. At least two crease lines form a T-shaped crease line on the packaging paper. An L-shaped cutting line is provided at the intersection of the T-shaped crease lines. The L-shaped cutting line includes a main cutting line and a stress-relieving cutting line. One end of the stress-relieving cutting line is perpendicularly connected to one end of the main cutting line, and the stress-relieving cutting line extends a predetermined distance towards the edge of the packaging paper.

2. The packaging paper according to claim 1, characterized in that, The preset distance is A, where 1mm ≤ A ≤ 1.5mm.

3. The packaging paper according to claim 1 or 2, characterized in that, The connection between the main cutting line and the unloading cutting line is provided with a rounded chamfer, the radius of which is R2, wherein 0.2mm≤R2≤0.8mm.

4. A die-cutting blade, characterized in that, include: Main body; The stress-relieving part is vertically connected to one end of the main body and forms an L-shaped die-cutting blade with the main body.

5. The die-cutting blade according to claim 4, characterized in that, The length of the stress-relieving part along the first direction is A, where 1mm≤A≤1.5mm; And / or, a rounded corner structure is provided at the connection between the main body and the unloading part, and the radius of the rounded corner structure is R1, wherein 0.2mm≤R1≤0.8mm.

6. A die-cutting machine, characterized in that, Includes the die-cutting blade as described in claim 4 or 5.

7. A method for die-cutting packaging paper, characterized in that, include: Unfold and lay the wrapping paper flat; Crease lines are made on the packaging paper, and at least two crease lines form a T-shaped crease line on the packaging paper; Cutting lines are made on the packaging paper, wherein an L-shaped cutting line is cut at the intersection of the T-shaped crease lines. The L-shaped cutting line includes a main cutting line and a stress-relieving cutting line. One end of the stress-relieving cutting line is perpendicularly connected to one end of the main cutting line, and the stress-relieving cutting line extends a predetermined distance toward the edge of the packaging paper.

8. The packaging paper die-cutting method according to claim 7, characterized in that, The preset distance is A, where 1mm ≤ A ≤ 1.5mm.

9. The packaging paper die-cutting method according to claim 7 or 8, characterized in that, A rounded chamfer is provided at the connection between the main cutting line and the unloading cutting line, and the radius of the rounded chamfer is R2, wherein 0.2mm≤R2≤0.8mm.

10. Packaging paper, characterized in that, It is made using the die-cutting method for packaging paper as described in any one of claims 7 to 9.

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