Fine PET base material cigarette packaging die cutting structure and preparation method thereof
By improving the die-cut structure of the smoke packaging of fine-branch PET substrates, using specific crease design and adhesive plate improvement, the problems of "fried bags" and sharp corner layering in the high-speed packaging of fine-branch cigarettes are solved, and a significant improvement in production efficiency and quality has been achieved.
Patent Information
- Application Number
- CN202510602923.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-12
- Publication Date
- 2025-07-15
AI Technical Summary
The traditional cigarette packaging die-cutting process can easily lead to the "fried bag" and sharp corner layering of fine cigarettes during high-speed packaging, and the existing die-cutting structure leads to low operating efficiency of the hood packaging machine, which cannot meet the high-speed production needs of the fine cigarette market.
The improved die-cut structure of the smoke packaging of fine-branched PET substrates includes specific crease and bonding plate design. By hollowing out the ear plate, dovetail arc transition and fish scale-shaped tooth line bonding, the bonding area and adhesive amount are increased, the die-cut depth and adhesive position are optimized, and the product molding stability during high-speed packaging is ensured.
The production efficiency of fine cigarette packaging has been increased from 300 packs/minute to 600 packs/minute, and the molding failure rate has been reduced to below 0.3%, solving the problems of "fried bags" and sharp corner stratification, and improving the production stability and quality of the product.
Smart Images
Figure CN120308459A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of die-cutting for cigarette packaging with fine-denier PET base material, and relates to a die-cutting structure for cigarette packaging with fine-denier PET base material, and also relates to a preparation method for the die-cutting structure for cigarette packaging with fine-denier PET base material. Background Art
[0002] Nowadays, all industries are demanding to improve speed and efficiency. Cigarette packing machines are generally upgraded from medium and low speed to high speed. For the traditional die-cutting process of cigarette wrapping paper, it only needs to cut through the top and bottom ear positions of the cigarette label without hollowing out and removing treatment. When folding and forming at high speed, the "ears" (two kinds of adhesive sheets bonded to the side plates of the box cover and the box body) of the box body are prone to extrusion and superposition, resulting in non-square forming, and even "bursting of the package". The original box-type die-cutting structure leads to low operating efficiency of the cigarette packing machine. Especially now, the market share of fine-denier cigarettes is growing rapidly, and the requirement for speed increase of fine-denier cigarettes is also imminent. The folding edge of the traditional cigarette label is generally 21.5 - 22 mm, while that of the fine-denier cigarette is 11.5 - 12 mm. According to the law of mechanics, when the force arm is reduced by half, the force required for folding and forming must be doubled. Therefore, for the same forming requirements, the crease stiffness value of the fine-denier cigarette is lower, and the requirement for the adhesive bonding strength of the box gluing is higher. It is also necessary to ensure that the glue application amount per unit area of the box edge is increased without overflow.
[0003] In addition, in order to ensure the squareness of the box gluing forming and prevent rebound, as Figure 1 shown (in the figure, ① tongue plate, ② top ear plate; ③ swallowtail; ④ adhesive position; ⑤ bottom ear plate), the "swallowtail" angle of the traditional cigarette label is generally 150 degrees. The "swallowtail" angle of the fine-denier cigarette label is mainly 129.2 - 130 degrees. Since the side length is reduced by half from 21.5 mm, the "swallowtail" of the fine-denier cigarette label is particularly sharp and slender, and it is prone to collision damage to its sharp corners during production, transportation, storage and use. Especially for the fine-denier cigarette label produced with a new packaging material mainly based on PET base film, due to its particularly sharp "swallowtail" (the two ends of the cigarette box), the bottom paper and the PET film are particularly prone to delamination in the sharp corner area due to stress concentration. Therefore, the consumption of producing such products during cigarette packing is much higher than that of conventional products. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to provide a die-cutting structure for cigarette packaging with fine-denier PET base material, which can avoid "bursting of the package" and delamination of sharp corners of the fine-denier PET base material cigarette label.
[0005] The technical solution adopted by the present invention is as follows: A die-cutting structure for a cigarette package with a thin PET substrate, including a die-cut paper for the box lid and a die-cut paper for the box body. The die-cut paper for the box lid includes a tongue plate, a buckle plate, and a cover plate connected in sequence from top to bottom through a first crease. The die-cut paper for the box body includes a back plate, a bottom plate, and a front plate connected in sequence from top to bottom through a second crease. The cover plate and the back plate are connected through a connecting plate, and the connecting plate is connected to the cover plate and the back plate through a third crease. Two first bonding plates are arranged on both sides of the back plate, a suspended first ear plate is arranged at the bottom of the first bonding plate, two box body side plates are arranged on both sides of the front plate, and the bottoms of the two box body side plates are formed into swallow tails. Two second bonding plates are arranged on both sides of the connecting plate, and a cantilevered second ear plate is arranged on the upper side of the second bonding plate. A third crease for the inward turning of the first bonding plate is arranged between the first bonding plate and the back plate. A fourth crease for the inward turning of the box body side plate is arranged between the front plate and the box body side plate. The cover plate is provided with a cover side plate, and a fifth crease for the inward turning of the cover side plate is arranged between the cover side plate and the cover plate. The top of the cover side plate is formed into a triangular part that docks with the swallow tail.
[0006] Further, the extended segments at both ends of the second crease are shared between the first ear plate and the first bonding plate.
[0007] Further, the connecting plate and the second bonding plate are connected through a fifth crease, and the fifth crease is collinear with the third crease.
[0008] Further, two triangular inclined structures are arranged on both sides of the top of the first bonding plate, and an inverted inclined triangular structure is arranged at the bottom of the second bonding plate. A gap is maintained between the triangular inclined structure and the inverted inclined triangular structure, and the gap gradually widens from inside to outside.
[0009] Further, the minimum acute angle of the swallow tail and the triangular part is provided with a straight line segment perpendicular to the vertical right-angled side, and an R1.5 arc segment is arranged at the transition between the straight line segment and the hypotenuse.
[0010] Further, the steel wires of the uppermost first crease and the fourth crease are 23.95 mm, and the depth of the groove line corresponding to the steel wire on the bottom film is 0.65 mm.
[0011] Further, fish-scale type tooth lines are arranged on one side of the box body side plate and the box lid side plate where the first bonding plate and the second bonding plate are respectively bonded.
[0012] A preparation method for a die-cutting structure of a cigarette package with a thin PET substrate, the method comprising the steps: Step 1, respectively perform a hollowing and cutting process on the ear plate positions at the top and bottom of the small box of the cigarette label with a thin PET substrate to form a cantilevered first ear plate and a second ear plate; Step 2, set a straight line segment of 1 mm perpendicular to the vertical right-angled side for the minimum acute angle of the swallow tail and the triangular part of the packaging die-cutting structure, and form an R1.5 arc segment at the transition between the straight line segment and the hypotenuse; Step 3: The steel wires of the topmost first crease and fourth crease are 23.95 mm, and the depth of the groove line corresponding to the steel wire on the bottom film increases from 0.6 mm to 0.65 mm. Step 4: The adhesive dot tooth lines of the first bonding plate and the second bonding plate adopt fish-scale tooth lines. Step 5: When the first bonding plate and the second bonding plate are produced and printed, the adhesive area adopts intaglio water-based white ink. Step 6: During die-cutting operation, the operator should control the depth of the adhesive cutter tooth line at the adhesive position, and the die-cutting depth is between one-third and one-half of the paper thickness. Step 7: The die-cutting process needs to ensure the flatness of the cigarette labels of the fine-branch PET base material.
[0013] Advantages of the present invention: Compared with the prior art, the present invention can increase the cigarette-packing production efficiency of this type of fine-branch cigarette label product from 300 packs / minute to 600 packs / minute, and the defective rate of high-speed packaging forming drops to less than 0.3%, effectively solving the "blasting" and sharp-corner delamination problems of the fine-branch PET base material cigarette labels. Description of the Drawings
[0014] Figure 1 It is a schematic diagram of the die-cutting structure for the packaging of the fine-branch PET base material cigarette. Figure 2 It is a comparison diagram of the die plates before and after the first ear plate and the second ear plate are hollowed out. Figure 3 It is a schematic diagram of the dovetail changed from a sharp corner to an R1.5 arc + vertically extended by 1 mm. Figure 4 It is a schematic diagram of the detection points of the crease stiffness value of the cigarette label. Figure 5 It is a comparison diagram of the tooth lines at the adhesive positions of the first bonding plate and the second bonding plate. Figure 6 It is a schematic diagram of the traditional cigarette label structure. Detailed Embodiments
[0015] The present invention will be further introduced below in conjunction with specific embodiments.
[0016] Embodiment 1: As Figure 1As shown in the figure, a die-cutting structure for a slender PET substrate cigarette package includes a die-cut paper 1 for the box cover and a die-cut paper 2 for the box body. The die-cut paper 1 for the box cover includes a tongue plate 101, a buckle plate 102, and a cover plate 103 connected in sequence from top to bottom through a first crease 4. The die-cut paper 2 for the box body includes a back plate 201, a bottom plate 202, and a front plate 203 connected in sequence from top to bottom through a second crease 5. A connecting plate 3 is connected between the cover plate 103 and the back plate 201, and the connecting plate 3 is connected to the cover plate 103 and the back plate 201 through a third crease 6. Two first adhesive plates 204 are provided on both sides of the back plate 201. A suspended first ear plate 205 is provided at the bottom of the first adhesive plate 204. Two box body side plates 206 are provided on both sides of the front plate 203. The bottoms of the two box body side plates 206 are formed into swallow tails 207. Two second adhesive plates 301 are provided on both sides of the connecting plate 3. A cantilevered second ear plate 302 is provided on the upper side of the second adhesive plate 301. A third crease 208 for the first adhesive plate 204 to turn inward is provided between the first adhesive plate 204 and the back plate 201. A fourth crease 209 for the box body side plate 206 to turn inward is provided between the front plate 203 and the box body side plate 206. The cover plate 103 is provided with a cover side plate 104. A fifth crease 105 for the cover side plate 104 to turn inward is provided between the cover side plate 104 and the cover plate 103. The top of the cover side plate 104 is formed into a triangular part 106 that docks with the swallow tail 207.
[0017] The ear plate positions are hollowed out and cut to ensure that when the product is formed on a high-speed cigarette packing machine, the folded part at the ear positions reduces the extrusion caused by the paper thickness, making the finished product easier to form.
[0018] Specifically, the first ear plate 205 and the first adhesive plate 204 share the extended sections at both ends of the second crease 5. The extended second crease is used for the first ear plate 205 to turn inward (towards the inside of the slender cigarette small box).
[0019] Specifically, the connecting plate 3 and the second adhesive plate 301 are connected through a fifth crease 302. The fifth crease 302 is collinear with the third crease 208 and is used for the second adhesive plate 301 to turn inward.
[0020] Specifically, two triangular inclined structures are provided on both sides of the top of the first adhesive plate 204, and an inverted inclined triangular structure is provided at the bottom of the second adhesive plate. There is a gap between the triangular inclined structure and the inverted inclined triangular structure, and the gap gradually widens from inside to outside.
[0021] Specifically, the minimum acute angle of the swallow tail 207 and the triangular part 106 is set with a straight line segment 7 perpendicular to the vertical right-angle side. An R1.5 arc segment 8 is provided at the transition between the straight line segment 7 and the hypotenuse. Another obtuse angle of the triangular part 106 is also set with a straight line segment 7; an R1.5 arc transition is added, and the original sharp corner is cut off and changed to a 1-mm-wide short line. After the swallow tail sharp corner is changed to an arc transition, stress concentration can be reduced and material damage and delamination can be reduced. Specifically, the steel wires of the uppermost first crease 4 and the fourth crease 209 are 23.95 mm, and the depth of the groove line of the bottom film corresponding to the steel wire is 0.65 mm.
[0022] Specifically, the first bonding plate 204 and the second bonding plate 301 are respectively bonded to the side plates 206 of the box body and the side plates 104 of the box cover. One side of each is provided with fish-scale type tooth lines 210. The glue point tooth lines at the glue-bonding positions of the first bonding plate and the second bonding plate are changed from the traditional diagonal type glue-bonding tooth lines to fish-scale type tooth lines, and the glue-receiving points per unit area are increased by 20 - 25%, increasing the glue-receiving amount of the finished product.
[0023] Example 2: As Figures 2 - 5 shown, a preparation method of a die-cutting structure for a cigarette package with a thin PET substrate includes the following steps: Step 1, respectively perform a hollowing-out and cutting treatment on the ear plate positions at the top and bottom of the cigarette label small box with a thin PET substrate to form cantilevered first ear plate and second ear plate; Perform a hollowing-out and cutting treatment on the "ear plate" positions at the top and bottom of the cigarette label small box with a thin PET substrate (see Figure 1 ), to ensure that when the product is formed on a high-speed cigarette packing machine, the folded-in part at the ear position has less extrusion caused by the paper thickness, making the finished product easier to form ( Figure 2 ).
[0024] Step 2, set the minimum acute angle of the swallowtail part and the triangular part of the die-cutting structure to a straight line segment perpendicular to the right-angled side with a length of 1 mm, and set the transition between the straight line segment and the hypotenuse to an R1.5 arc segment; Add an R1.5 arc transition to the sharp acute angle (generally 39 - 40 degrees) position of the "swallowtail", and cut off the original sharp angle and change it to a short line with a width of 1 mm. After changing the sharp angle of the swallowtail to an arc transition, stress concentration can be reduced and material damage and delamination can be decreased (see Figure 3 ).
[0025] Step 3, set the steel wire of the uppermost first crease and the fourth crease to 23.95 mm, increased from the original 23.9 mm to 23.95 mm, and increase the depth of the groove line of the bottom film corresponding to the steel wire from 0.6 mm to 0.65 mm; See Figure 4 , for the crease lines at the 3rd point (tongue position) and the 5th and 6th points (both side edges), the steel wire is increased from the original 23.9 mm to 23.95 mm, and the depth of the groove line of the bottom film corresponding to it is increased from 0.6 mm to 0.65 mm. In this way, the stiffness value of the die-cut crease is lower than that of the original die-cutting method.
[0026] Step 4, adopt fish-scale type tooth lines for the glue point tooth lines of the first bonding plate and the second bonding plate; See Figure 5As shown in the figure, the adhesive dots' serrated lines at the adhesive positions of the first and second adhesive plates are changed from the traditional diagonal adhesive serrated lines to fish-scale serrated lines, with the number of adhesive-receiving points per unit area increasing by 20-25%, increasing the adhesive capacity of the finished product. Step 5: Use gravure water-based white ink in the adhesive areas during the production and printing of the first and second adhesive plates. To increase the affinity and fastness of the adhesive positions to the glue, gravure water-based white ink is needed to replace the offset UV white ink in the adhesive areas during production and printing to ensure that the surface tension after printing in the adhesive areas is ≥ 38 dynes.
[0027] Step 6: During the die-cutting operation, the operator should control the depth of the adhesive serrated lines at the adhesive positions, and the die-cutting depth is between one-third and one-half of the paper thickness. Step 7: The flatness of the cigarette label products with fine-denier PET base materials needs to be ensured in all die-cutting processes.
[0028] The remaining die-cutting processes can adopt the conventional die-cutting process.
[0029] Specific application of the solution of the present invention: 1. The cigarette box wrapping paper of Guiyan (Kuayue), with the raw material being 21um PET high-brightness base film laminated with 200g yellow-core white cardboard. The product production process includes gravure printing, offset printing, hot stamping, screen printing, and die-cutting, and the processes are relatively numerous and complex. This product has been well received by consumers since its launch, and the annual sales volume has been increasing year by year. Now it has exceeded 400,000 large cases / year. Due to the original production capacity not being able to keep up with the booming market demand, the cigarette-packing production speed of the original 300 packs / minute has to be increased to 600 packs / minute. The speed increase of cigarette packing has also promoted the innovation of the production process of cigarette label materials.
[0030] According to the materials of the original production process, "box sticking and packet explosion" occurred many times during the production on high-speed machines. Due to the relatively high crease stiffness value (>65) at the side and tongue positions, stable production could not be achieved. Moreover, due to the increased collision force during high-speed production, the dovetail sharp corners of the box label paper also frequently showed delamination phenomena (delamination between the PET base film and the bottom paper at the dovetail sharp corners).
[0031] After changing to the die-cutting process solution of the present invention for improvement, the differences in the finished products are as follows: The top ear plates and bottom ear plates have been hollowed out (forming a cantilever structure), and the dovetail has been processed with an R1.5 + 1mm arc transition (at the dovetail part and the triangular part). The products are delivered to the customer for on-machine testing and fully meet the production efficiency of 600 packs / minute. The number of stops per hour is less than 2 times, and the number of rejected cigarette label formed products in a shift is less than 5 packs.
[0032] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the said claims.
Claims
1. A die-cutting structure for a cigarette package with a thin PET substrate, characterized in that, It includes a die-cut paper for the box lid (1) and a die-cut paper for the box body (2). The die-cut paper for the box lid (1) includes a tongue plate (101), a buckle plate (102), and a cover plate (103) connected in sequence from top to bottom through a first crease (4). The die-cut paper for the box body (2) includes a back plate (201), a bottom plate (202), and a front plate (203) connected in sequence from top to bottom through a second crease (5). The cover plate (103) and the back plate (201) are connected through a connecting plate (3), and the connecting plate (3) is connected to the cover plate (103) and the back plate (201) through a third crease (6). Two first adhesive plates (204) are arranged on both sides of the back plate (201), and a suspended first ear plate (205) is arranged at the bottom of the first adhesive plate (204). Two box body side plates (206) are arranged on both sides of the front plate (203), and the bottoms of the two box body side plates (206) are set as swallow tails (207). Two second adhesive plates (301) are arranged on both sides of the connecting plate (3), and a cantilevered second ear plate (302) is arranged on the upper side of the second adhesive plate (301). A third crease (208) for the first adhesive plate (204) to turn inwards is arranged between the first adhesive plate (204) and the back plate (201). A fourth crease (209) for the box body side plate (206) to turn inwards is arranged between the front plate (203) and the box body side plate (206). The cover plate (103) is provided with a cover side plate (104), and a fifth crease (105) for the cover side plate (104) to turn inwards is arranged between the cover side plate (104) and the cover plate (103). The top of the cover side plate (104) is set as a triangular part (106) that docks with the swallow tail (207).
2. The die-cutting structure of a slender PET base material cigarette package according to claim 1, wherein The extended segments at both ends of the second crease (5) are shared between the first ear plate (205) and the first adhesive plate (204).
3. A die-cutting structure for a slender PET substrate cigarette package according to claim 1, characterized in that, The connecting plate (3) and the second adhesive plate (301) are connected through a fifth crease (303), and the fifth crease (303) is collinear with the third crease (208).
4. A die-cutting structure for a cigarette package with a thin PET substrate according to claim 1, wherein, Two triangular inclined structures are arranged on both sides of the top of the first adhesive plate (204), and an inverted inclined triangular structure is arranged at the bottom of the second adhesive plate. There is a gap between the triangular inclined structure and the inverted inclined triangular structure, and the gap gradually widens from inside to outside.
5. A die-cutting structure for a cigarette package with a thin PET substrate according to claim 1, characterized in that, A straight line segment (7) perpendicular to the right-angle side is set for the minimum acute angle of the swallow tail (207) and the triangular part (106), and an R1.5 arc segment (8) is arranged at the transition between the straight line segment (7) and the hypotenuse.
6. The die-cutting structure of a thin-stem PET base material cigarette package according to claim 1, characterized in that, The steel wires of the uppermost first crease (4) and fourth crease (209) are 23.95 mm, and the depth of the groove line of the steel wire corresponding to the bottom film is 0.65 mm.
7. A die-cutting structure for a thin-stem PET substrate cigarette package according to claim 1, characterized in that, Scaled tooth lines (210) are arranged on one side of the first adhesive plate (204) and the second adhesive plate (301) that are respectively adhered to the box body side plate (206) and the box lid side plate (104).
8. The preparation method of a die-cutting structure for a slender PET base material cigarette package according to claim 1, characterized in that, The method includes the following steps: Step 1, respectively perform a hollowing-out excision treatment on the ear plate positions at the top and bottom of the cigarette label small box made of thin PET base material to form a cantilevered first ear plate and a second ear plate; Step 2, set a 1-mm straight line segment perpendicular to the right-angle side for the minimum acute angle of the swallow tail and the triangular part of the packaging die-cut structure, and set an R1.5 arc segment at the transition between the straight line segment and the hypotenuse; Step 3: The steel wires of the uppermost first crease and fourth crease are 23.95 mm, and the depth of the groove line corresponding to the steel wire on the bottom film is increased from 0.6 mm to 0.65 mm. Step 4: The adhesive dot lines of the first adhesive plate and the second adhesive plate adopt fish-scale type dot lines. Step 5: When the first adhesive plate and the second adhesive plate are produced and printed, the adhesive area uses gravure water-based white ink. Step 6: During die-cutting operation, the operator should control the depth of the adhesive cutter teeth line at the adhesive position, and the die-cutting depth is between one-third and one-half of the paper thickness. Step 7: During the die-cutting process, it is necessary to ensure the flatness of the cigarette label products made of fine PET substrates.