Thin PET base material cigarette packaging die cutting structure
By improving the die-cutting structure and process, the problems of "packaging" and sharp corner delamination in the packaging of slim cigarettes were solved, improving production efficiency and the material's resistance to damage, and achieving a highly efficient and stable packaging process.
Patent Information
- Application Number
- CN202520919620.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-12
- Publication Date
- 2026-05-19
- Estimated Expiration
- 2035-05-12
AI Technical Summary
Traditional cigarette packaging die-cutting processes are prone to problems such as "packaging explosion" and sharp corner delamination during high-speed packaging, especially in the production of slim cigarettes, resulting in low production efficiency and material damage.
An improved die-cutting structure is adopted, including hollowed-out ear plate design, dovetail corner rounded transition, increased crease stiffness and bonding plate tooth line design, combined with fish scale tooth line and gravure water-based white ink, to optimize the die-cutting process to improve molding stability and glue bonding strength.
It has increased the production efficiency of slim cigarette packaging to 600 packs/minute, reduced the molding defect rate to below 0.3%, avoided "packet explosion" and sharp corner delamination, and improved the material's resistance to damage.
Smart Images
Figure CN224257184U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of die-cutting technology for cigarette packaging made of slim PET substrate, and relates to a die-cutting structure for cigarette packaging made of slim PET substrate. Background Technology
[0002] Currently, all industries are demanding faster and more efficient operations. Cigarette packaging machines are generally being upgraded from low-to-medium speed to high-speed. However, traditional cigarette packaging die-cutting processes only require cutting through the top and bottom "ears" of the cigarette label, without any hollowing-out process. During high-speed packaging and folding, the "ears" (two types of adhesive sheets that bond to the lid and body side panels) are prone to compression and overlap, resulting in irregular shapes and even "packaging failure." The existing box-shaped die-cutting structure leads to low operating efficiency for cigarette packaging machines. Especially with the rapid growth in the market share of slim cigarettes, the need for faster processing is becoming increasingly urgent. The folded edge of traditional cigarette labels is generally 21.5~22mm, while that of slim cigarettes is 11.5~12mm. According to the laws of mechanics, if the lever arm is reduced by half, the force required to fold and form the cigarette must be doubled. Therefore, for the same forming requirements, slim cigarettes have a lower crease stiffness value and require a higher degree of adhesive strength for gluing the box. It is also necessary to increase the amount of glue applied per unit area on the edge of the box without overflowing.
[0003] In addition, to ensure the squareness of the box forming and prevent rebound, such as Figure 1 As shown in the diagram (① tongue plate, ② top ear plate; ③ dovetail; ④ adhesive position; ⑤ bottom ear plate), the "dovetail" angle of traditional cigarette labels is generally 150 degrees. The "dovetail" angle of slim cigarette labels is mainly 129.2~130 degrees. Because the side length is reduced by half from 21.5mm, the "dovetail" of slim cigarette labels is particularly sharp and long, making it prone to collision damage during production, transportation, storage, and use. Especially for slim cigarette labels produced using new packaging materials primarily based on PET film, the particularly sharp corners of the "dovetail" (the two ends of the cigarette box) are particularly prone to stress concentration, leading to delamination between the base paper and the PET film. Therefore, the consumption during the production of this type of product is much higher than that of conventional products. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a die-cutting structure for cigarette packaging made of thin PET substrate, which can avoid "packaging" and sharp corner delamination of cigarette labels made of thin PET substrate.
[0005] The technical solution adopted by this utility model is as follows: a die-cutting structure for slim PET substrate cigarette packaging, including a lid die-cutting paper and a box body die-cutting paper. The lid die-cutting paper includes a tongue plate, a snap plate, and a cover plate connected sequentially from top to bottom through a first fold. The box body die-cutting paper includes a back plate, a bottom plate, and a front plate connected sequentially from top to bottom through a second fold. The cover plate and the back plate are connected by a connecting plate, and the connecting plate is connected to the cover plate and the back plate through a third fold. Two first adhesive plates are provided on both sides of the back plate, and a suspended first adhesive plate is provided at the bottom of the first adhesive plate. The front panel has two box side panels on both sides, with the bottom of the two box side panels set as dovetails. The connecting plate has two second adhesive plates on both sides, with a cantilevered second ear plate on the upper side of the second adhesive plates. There is a third crease between the first adhesive plate and the back plate for the first adhesive plate to fold inward. There is a fourth crease between the front panel and the box side panels for the box side panels to fold inward. The cover plate has a cover side plate, and there is a fifth crease between the cover side plates for the cover side plates to fold inward. The top of the cover side plate is set as a triangular part that connects to the dovetail.
[0006] Furthermore, the first ear plate and the first adhesive plate share the extended sections at both ends of the second fold.
[0007] Furthermore, the connecting plate and the second adhesive plate are connected by a fifth crease, which is collinear with the third crease.
[0008] Furthermore, two triangular inclined structures are provided on the top two sides of the first adhesive plate, and an inverted inclined triangular structure is provided at the bottom of the second adhesive plate. The triangular inclined structures and the inverted inclined triangular structure maintain a gap, and the gap gradually widens from the inside to the outside.
[0009] Furthermore, the minimum acute angle of the dovetail and triangular parts is set as a straight line segment perpendicular to the right-angled side, and an R1.5 arc segment is set at the transition between the straight line segment and the hypotenuse.
[0010] Furthermore, the steel wires of the first and fourth creases on the uppermost side are 23.95 mm long, and the depth of the groove line corresponding to the steel wires is 0.65 mm.
[0011] Furthermore, the first and second adhesive plates mentioned above are respectively provided with fish-scale serrated lines on the side of the box body and the side of the box lid.
[0012] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model can increase the production efficiency of this type of slim cigarette label from 300 packs / minute to 600 packs / minute, reduce the high-speed packaging forming defect rate to below 0.3%, and effectively solve the problems of "packing explosion" and sharp corner delamination of slim PET substrate cigarette labels. Attached Figure Description
[0013] Figure 1A schematic diagram of the die-cut structure for slim PET-based cigarette packaging;
[0014] Figure 2 Comparison of the cutting tools before and after hollowing out the first and second ear plates;
[0015] Figure 3 A schematic diagram showing how the dovetail shape is changed from a pointed corner to a 1.5 R1.5 arc with a 1mm vertical extension;
[0016] Figure 4 This is a schematic diagram of the points for testing the stiffness value of cigarette label creases.
[0017] Figure 5 A comparison diagram of the adhesive bonding positions of the first and second adhesive boards;
[0018] Figure 6 This is a schematic diagram of the traditional cigarette label structure. Detailed Implementation
[0019] The present invention will be further described below with reference to specific embodiments.
[0020] Example 1: As Figure 1 As shown, a die-cut structure for a slim PET-based cigarette packaging includes a lid die-cutting paper 1 and a body die-cutting paper 2. The lid die-cutting paper 1 includes a tongue plate 101, a snap plate 102, and a cover plate 103 connected sequentially from top to bottom via a first fold 4. The body die-cutting paper 2 includes a back plate 201, a bottom plate 202, and a front plate 203 connected sequentially from top to bottom via a second fold 5. The cover plate 103 is connected to the back plate 201 via a connecting plate 3, and the connecting plate 3 is connected to the cover plate 103 and the back plate 201 via a third fold 6. Two first adhesive plates 204 are provided on both sides of the back plate 201, and a suspended first ear plate 205 is provided at the bottom of the first adhesive plates 204. Two box-shaped inserts are provided on both sides of the front plate 203. The body side panel 206 has two box body side panels 206 with dovetail-shaped bottoms 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 fold inward is provided between the first adhesive plate 204 and the back plate 201. A fourth crease 209 for the box body side panel 206 to fold inward is provided between the front plate 203 and the box body side panel 206. The cover plate 103 is provided with a cover side panel 104. A fifth crease 105 for the cover side panel 104 to fold inward is provided between the cover side panel 104 and the cover plate 103. The top of the cover side panel 104 is provided as a triangular part 106 that connects to the dovetail-shaped bottoms 207.
[0021] The ear plate area is hollowed out and cut off to ensure that when the product is formed on the high-speed cigarette wrapping machine, the folded part at the ear position is reduced due to the compression caused by the thickness of the paper, making the finished product easier to form.
[0022] 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 fold inward (towards the inside of the slim cigarette box).
[0023] Specifically, the connecting plate 3 and the second adhesive plate 301 are connected by the fifth fold 302, which is collinear with the third fold 208 and is used to fold the second adhesive plate 301 inward.
[0024] Specifically, two triangular inclined structures are provided on the top two sides of the first adhesive plate 204, and an inverted inclined triangular structure is provided at the bottom of the second adhesive plate. The triangular inclined structures and the inverted inclined triangular structure maintain a gap, and the gap gradually widens from the inside to the outside.
[0025] Specifically, the smallest acute angle of the dovetail portion 207 and the triangular portion 106 is provided with a straight line segment 7 perpendicular to the right-angled side. A radius of 1.5 arc segment 8 is provided at the transition between the straight line segment 7 and the hypotenuse. The other obtuse angle of the triangular portion 106 is also provided with a straight line segment 7. A radius of 1.5 arc is added for the transition, and the original sharp corner is cut off and replaced with a short line 1mm wide. Replacing the dovetail sharp corner with an arc transition reduces stress concentration and minimizes material damage and delamination.
[0026] Specifically, the steel wires of the first crease 4 and the fourth crease 209 on the top side are 23.95mm long, and the depth of the groove line corresponding to the steel wires is 0.65mm.
[0027] Specifically, the first adhesive plate 204 and the second adhesive plate 301 are respectively bonded to the side plate 206 of the box body and the side plate 104 of the box cover. Both sides are provided with fish scale-shaped teeth 210. The adhesive teeth at the adhesive position of the first adhesive plate and the second adhesive plate are changed from the traditional oblique adhesive teeth to fish scale teeth, which increases the adhesive points per unit area by 20~25% and increases the adhesive capacity of the finished product.
[0028] Example 2: As Figure 2-5 As shown, a method for preparing a die-cut structure for cigarette packaging based on a thin PET substrate includes the following steps:
[0029] Step 1: Hollow out and cut off the top and bottom ear plate positions of the small PET substrate cigarette label box to form the cantilevered first ear plate and second ear plate.
[0030] The top and bottom "ear plates" of the slim PET substrate cigarette pack are located (see...). Figure 1 The paper is hollowed out and cut off to ensure that the folded-in portion at the "ear" position reduces compression due to the paper thickness when the product is formed on the high-speed cigarette wrapping machine, making the finished product easier to shape. Figure 2 ).
[0031] Step 2: Set the minimum acute angle of the dovetail and triangular parts of the packaging die-cut structure to a straight line segment of 1mm perpendicular to the right angle side, and set the transition between the straight line segment and the hypotenuse to an R1.5 arc segment;
[0032] Add a 1.5mm radius rounded corner to the sharp angle of the "dovetail" (typically 39-40 degrees), and cut off the original sharp corner, replacing it with a short line 1mm wide. Replacing the dovetail sharp corner with a rounded corner reduces stress concentration and minimizes material delamination (see...). Figure 3 ).
[0033] Step 3: Increase the steel wire of the first and fourth creases on the top side to 23.95mm, from the original 23.9mm to 23.95mm, and increase the depth of the bottom film groove line corresponding to the steel wire from 0.6mm to 0.65mm.
[0034] See Figure 4 The steel wire for the crease lines at points 3 (tongue position), 5, and 6 (both sides) has been increased from 23.9mm to 23.95mm, and the corresponding depth of the bottom film groove line has been increased from 0.6mm to 0.65mm. As a result, the stiffness value of the creases produced by die-cutting is lower than that of the original die-cutting method.
[0035] Step 4: Apply fish-scale pattern teeth to the adhesive dots of the first and second bonding plates.
[0036] See Figure 5 As shown, the adhesive dots at the bonding positions of the first and second bonding plates are changed from the traditional oblique adhesive dots to fish scale dots, increasing the number of adhesive dots per unit area by 20-25% and increasing the amount of adhesive in the finished product.
[0037] Step 5: When printing the first and second bonding plates, the adhesive area is printed with gravure water-based white ink.
[0038] To increase the adhesion and bonding strength of the adhesive to the glue, the adhesive area needs to be printed with gravure water-based white ink instead of offset UV white ink to ensure that the surface tension of the adhesive area is ≥38 dynes after printing.
[0039] Step 6: During the die-cutting operation, the operator must control the depth of the adhesive blade teeth at the adhesive position. The die-cutting depth should be between one-third and one-half of the paper thickness.
[0040] Step 7 and the die-cutting process both require ensuring the flatness of the slim PET substrate cigarette label products.
[0041] The remaining die-cutting processes can be carried out using conventional die-cutting techniques.
[0042] Specific Applications of the Solution: 1. The packaging paper for Guiyan (Kuayue) cigarettes is made of 21um PET high-gloss base film laminated with 200g yellow-core white cardboard. The production process includes gravure printing, offset printing, hot stamping, screen printing, and die-cutting, which are quite numerous and complex. This product has been well-received by consumers since its launch, with annual sales increasing year by year, now exceeding 400,000 large cartons per year. Due to the original production capacity being unable to keep up with the booming market demand, the manufacturer had to increase the cigarette packaging speed from 300 packs / minute to 600 packs / minute. This accelerated production has also spurred innovation in the manufacturing process of cigarette label materials.
[0043] The materials used in the original production process repeatedly resulted in "box smearing and packaging explosions" during high-speed machine production. The sides and tongue areas, due to their high crease stiffness values (>65), could not be produced stably. Furthermore, the dovetail corners of the box label paper frequently delaminated due to the increased impact force during high-speed production (the PET base film at the dovetail corners delaminated from the backing paper).
[0044] After adopting the improved die-cutting process of this invention, the finished products differ as follows:
[0045] The top and bottom ear plates were hollowed out (forming a cantilever structure), and the dovetail was given a 1.5+1mm radius curve transition (both the dovetail and triangular sections). The product, after being delivered to the customer for testing, fully met the production efficiency of 600 packs / minute, with less than 2 downtimes per hour, and fewer than 5 packs of defective cigarette labels were removed per shift.
[0046] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.
Claims
1. A die-cutting structure for cigarette packaging made of slim PET substrate, characterized in that, The box includes a lid die-cutting paper (1) and a box body die-cutting paper (2). The lid die-cutting paper (1) includes a tongue plate (101), a snap plate (102), and a cover plate (103) connected from top to bottom through a first fold (4). The box body die-cutting paper (2) includes a back plate (201), a bottom plate (202), and a front plate (203) connected from top to bottom through a second fold (5). The cover plate (103) is connected to the back plate (201) 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 fold (6). Two first adhesive plates (204) are provided on both sides of the back plate (201), and 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 bottom of the box body side panel (206) is set as a dovetail (207). Two second adhesive plates (301) are set on both sides of the connecting plate (3). A cantilevered second ear plate (302) is set on the upper side of the second adhesive plate (301). A third crease (208) for the first adhesive plate (204) to be turned inward is set between the first adhesive plate (204) and the back plate (201). A fourth crease (209) for the box body side panel (206) to be turned inward is set between the front plate (203) and the box body side panel (206). The cover plate (103) is set with a cover side panel (104). A fifth crease (105) for the cover side panel (104) to be turned inward is set between the cover side panel (104) and the cover plate (103). The top of the cover side panel (104) is set as a triangular part (106) that connects to the dovetail (207).
2. The die-cutting structure for slim PET substrate cigarette packaging according to claim 1, characterized in that, The first ear plate (205) and the first adhesive plate (204) share the extensions at both ends of the second crease (5).
3. The die-cutting structure for slim PET substrate cigarette packaging according to claim 1, characterized in that, The connecting plate (3) is connected to the second adhesive plate (301) through the fifth crease (303), and the fifth crease (303) is collinear with the third crease (208).
4. The die-cutting structure for slim PET substrate cigarette packaging according to claim 1, characterized in that, The first adhesive plate (204) has two triangular inclined structures on the top two sides, and the second adhesive plate has an inverted inclined triangular structure at the bottom. The triangular inclined structure and the inverted inclined triangular structure maintain a gap, and the gap gradually widens from the inside to the outside.
5. The die-cutting structure for slim PET substrate cigarette packaging according to claim 1, characterized in that, The smallest acute angle of the dovetail (207) and the triangular part (106) is provided by a straight line segment (7) perpendicular to the right-angled side, and a circular arc segment (8) of R1.5 is provided at the transition between the straight line segment (7) and the hypotenuse.
6. The die-cutting structure for slim PET substrate cigarette packaging according to claim 1, characterized in that, The steel wires of the first crease (4) and the fourth crease (209) on the top side are 23.95 mm long, and the depth of the bottom film groove line corresponding to the steel wires is 0.65 mm.
7. The die-cutting structure for slim PET substrate cigarette packaging according to claim 1, characterized in that, The first adhesive plate (204) and the second adhesive plate (301) are respectively bonded to the side plate (206) of the box body and the side plate (104) of the box lid. Both sides are provided with fish scale-shaped tooth lines (210).