High-adhesion-strength die cutting process for 75-degree blade pin tooth trace
By employing a die-cutting process with a 75° blade angle and appropriate die-cutting depth, V-shaped grooves of suitable width and depth are formed on the paper surface, solving the problem of insufficient contact between glue and paper fibers in traditional die-cutting processes, and improving adhesion strength and production efficiency.
Patent Information
- Application Number
- CN202511850508.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-09
- Publication Date
- 2026-01-16
AI Technical Summary
In traditional die-cutting processes, insufficient cutting angle and depth of the needle teeth result in limited contact area and penetration depth between the adhesive and paper fibers, leading to frequent instances of incomplete adhesion, which affects adhesion strength and production efficiency.
A high-adhesion die-cutting process with a 75° blade angle and 75% to 85% die-cutting depth is used. Laser cutting technology is used to form V-shaped grooves of appropriate width and depth on the paper surface, increasing the contact area and penetration depth between the adhesive and the paper fibers.
It significantly improved adhesion strength, reduced tackiness, increased production efficiency and product quality, reduced downtime for adjustments, and increased growth rate by 7.14%.
Smart Images
Figure CN121340409A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of die-cutting technology for cigarette packaging materials, and more particularly to a high-adhesion die-cutting process with 75° blade teeth. Background Technology
[0002] Label paper is a crucial material in cigarette packaging production. During the rolling process, it needs to be die-cut using a serrated edge to facilitate subsequent folding and bonding processes. The die-cutting quality of the serrated edge directly affects the bonding effect between the label paper and the inner liner paper or other packaging materials. Traditional serrated edge die-cutting processes use die-cutting blades with a 52° or 60° blade angle, resulting in narrow grooves on the paper surface. This restricts the flow and diffusion of adhesive within the grooves, leading to insufficient contact area between the adhesive and the paper fibers, limited penetration depth, and a tendency for incomplete adhesion, thus affecting the product's bonding strength and packaging quality.
[0003] In existing technologies, the problem of incomplete adhesion is usually addressed by increasing the amount of adhesive applied or extending the pressing time. However, these methods not only increase production costs but also reduce production efficiency. Furthermore, the groove structure formed by the traditional blade angle has a weak guiding and diffusion effect on the adhesive, failing to fundamentally solve the problem of insufficient bonding between the adhesive and paper fibers. Therefore, there is a need to develop a needle-tooth die-cutting process that can effectively improve adhesion strength and reduce incomplete adhesion. Summary of the Invention
[0004] The purpose of this invention is to provide a high adhesion strength die-cutting process with 75° blade needle teeth to solve the problems existing in the prior art.
[0005] This invention provides a high adhesion strength die-cutting process for 75° blade teeth, comprising the following steps: Step 1: Raw material preparation: Select the base paper for the trademark paper and prepare the die-cutting mold; Step 2, Blade Parameter Setting: Select a die-cutting blade with a blade angle of 75°; Step 3: Set the needle tooth parameters: Set the tooth pitch to 1.2 to 1.8 mm, the tooth width to 0.3 to 0.5 mm, and the die-cutting depth to 75% to 85% of the paper thickness; Step 4: Die-cutting plate making: Use laser cutting technology to process the needle-tooth cutting edge on the die-cutting plate; Step 5, Die-cutting pressure adjustment: Install the die-cutting template on the die-cutting machine and adjust the die-cutting pressure to 0.25 to 0.35 MPa; Step 6: Die-cutting: Start the die-cutting machine to perform the die-cutting process. The 75° blade forms a V-shaped groove on the paper surface.
[0006] The above technical solution uses a 75° blade angle to form a wider V-shaped groove on the paper surface. The groove width is 15% to 25% wider than the traditional 52° blade. This V-shaped groove structure has a good flow guiding effect, which can guide the glue to flow along the groove direction and diffuse to both sides, increasing the contact area and penetration depth between the glue and the paper fibers, thereby significantly improving the adhesion strength and avoiding the occurrence of weak adhesion.
[0007] Furthermore, the die-cutting depth of the needle-tooth line is set to 80% of the paper thickness.
[0008] Furthermore, the basis weight of the trademark paper is 70 to 90 grams per square meter, and the thickness is 0.08 to 0.12 millimeters.
[0009] Furthermore, the die-cutting template is made of steel plate with a thickness of 0.71 mm, and the flatness error of the die-cutting template is controlled within 0.02 mm.
[0010] Furthermore, the cutting edge width of the die-cutting blade is 0.05 to 0.08 mm.
[0011] Furthermore, in step four, the laser cutting power is set to 800 to 1200 watts, the cutting speed is 15 to 25 millimeters per second, and the processing accuracy of the cutting edge is controlled within ±0.01 millimeters.
[0012] Furthermore, in step six, the operating speed of the die-cutting machine is set to 280 to 320 packages per minute.
[0013] Furthermore, the above process also includes step seven, quality inspection: quality inspection of the die-cut product, including the die-cutting depth and tooth pitch uniformity of the needle teeth. The die-cutting depth is measured using a thickness gauge with a measurement accuracy of 0.001 mm.
[0014] The beneficial effects of this invention are: 1. This invention uses a 75° blade angle combined with a die-cutting depth of 75% to 85% to form a V-shaped groove with appropriate width and depth on the paper surface. The groove width is increased by 15% to 25% compared to the traditional 52° blade, the glue penetration depth is increased from 0.028 mm to 0.042 mm, and the adhesion strength is improved by 15% to 22%, effectively avoiding the occurrence of weak adhesion.
[0015] 2. By optimizing the blade angle and die-cutting depth parameters, this invention reduces the number of downtime adjustments caused by adhesive problems during the wrapping process. The number of downtime adjustments is reduced from 5 times per shift to 1 to 2 times per shift, and the false adhesion rate is reduced from 2.5% to 0.6% to 1.0%, thereby improving production stability and product qualification rate.
[0016] 3. The optimized process parameters of this invention increase the production speed from 280 packs per minute to 300 packs per minute, an increase of 7.14%, which improves production efficiency and reduces production costs while improving product quality. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram comparing the blade angles of the present invention; Figure 2 This is a schematic diagram of the needle-tooth wire structure of the present invention; Figure 3 This is a schematic diagram of the V-shaped groove cross-section of the present invention; Figure 4 This is a process flow diagram of the present invention. Detailed Implementation
[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more comprehensive, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some well-known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.
[0020] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.
[0021] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.
[0022] See Figures 1 to 4As shown This invention provides a high-adhesion-strength die-cutting process with 75° blade teeth. This process increases the damaged area on the paper surface by using a blade with a specific angle to create teeth, forming a groove structure that facilitates the flow and diffusion of adhesive, thereby improving adhesion strength and avoiding the occurrence of weak adhesion.
[0023] The process flow of this invention includes the following steps: Step 1: Raw Material Preparation Select label paper as the base material, with a basis weight of 70 to 90 grams per square meter and a thickness of 0.08 to 0.12 millimeters. Prepare a die-cutting template made of 0.71-millimeter-thick steel plate, with the flatness error controlled within 0.02 millimeters.
[0024] Step 2: Setting the blade parameters A die-cutting blade with a 75° cutting angle and a cutting edge width of 0.05 to 0.08 mm is selected. Compared with the traditional 52° or 60° cutting angle, the 75° cutting angle can form a wider cutting groove on the paper surface, increasing the groove width by 15% to 25%, thereby increasing the contact area between the glue and the paper fibers.
[0025] Step 3: Setting the needle tooth parameters The tooth pitch of the needle thread is set to 1.2 to 1.8 mm, and the tooth width is set to 0.3 to 0.5 mm. The die-cutting depth of the needle thread is set to 75% to 85% of the paper thickness, preferably 80% of the paper thickness. When the paper thickness is 0.1 mm, the die-cutting depth is controlled between 0.075 and 0.085 mm, preferably 0.08 mm.
[0026] Step 4: Making the die-cutting template Laser cutting technology is used to process the needle-tooth cutting edge on the die. The laser cutting power is set to 800 to 1200 watts, and the cutting speed is 15 to 25 millimeters per second. The processing accuracy of the cutting edge is controlled within ±0.01 millimeters to ensure that the tooth pitch and tooth width of the needle-tooth line are uniform.
[0027] Step 5: Adjusting the die-cutting pressure Install the die-cutting template onto the die-cutting machine and adjust the die-cutting pressure to 0.25 to 0.35 MPa. The die-cutting pressure setting needs to be fine-tuned according to the basis weight and thickness of the paper; for paper with a higher basis weight, the die-cutting pressure needs to be increased appropriately. Excessive die-cutting pressure will cause the paper to pierce through, while insufficient pressure will prevent the preset die-cutting depth from being achieved.
[0028] Step Six: Die-cutting Start the die-cutting machine to perform the die-cutting process. Set the operating speed of the die-cutting machine to 280 to 320 packs per minute. During the die-cutting process, the 75° blade forms a V-shaped groove on the paper surface. The cross-section of the groove has a V-shaped structure with a 75° included angle. This V-shaped groove structure has a good flow guiding effect, which can guide the glue to flow along the groove direction and diffuse to both sides, increasing the penetration depth of the glue into the paper fibers.
[0029] Step 7: Quality Inspection The die-cut products undergo quality inspection, including the die-cutting depth of the needle teeth, the uniformity of the tooth pitch, and the adhesion strength. The die-cutting depth is measured using a thickness gauge with an accuracy of 0.001 mm. The adhesion strength is determined using a tensile tester, and the testing standard follows GB / T 2792.
[0030] Example 1 This embodiment provides a high-adhesion-strength die-cutting process with 75° blade teeth, the specific steps of which are as follows: The base material is selected as trademark paper with a basis weight of 80 grams per square meter and a thickness of 0.10 millimeters. A die-cutting blade with a blade angle of 75° and a blade width of 0.06 millimeters is selected. The tooth pitch of the serrations is set to 1.5 millimeters, and the tooth width is set to 0.4 millimeters. The die-cutting depth of the serrations is set to 80% of the paper thickness, i.e., a die-cutting depth of 0.08 millimeters.
[0031] Laser cutting technology was used to process needle-tooth cutting edges on a 0.71 mm thick steel plate die. The laser cutting power was set to 1000 watts, and the cutting speed was 20 mm per second. The die was mounted on the die-cutting machine, the die-cutting pressure was adjusted to 0.30 MPa, and the die-cutting machine's operating speed was set to 300 packs per minute.
[0032] The adhesive strength of the die-cut products was tested using hot melt adhesive at a rate of 15 grams per square meter, a bonding temperature of 150 degrees Celsius, and a pressing time of 0.5 seconds. The test results showed an adhesive strength of 4.8 Newtons per 15 millimeters, an improvement of 18.5% compared to the traditional 52° blade process.
[0033] Example 2 This embodiment provides a high-adhesion-strength die-cutting process with 75° blade teeth, the specific steps of which are as follows: The base material is 70 g / m² label paper with a thickness of 0.08 mm. A die-cutting blade with a cutting angle of 75° and a blade width of 0.05 mm is used. The tooth pitch of the serrations is set to 1.2 mm, and the tooth width is set to 0.3 mm. The die-cutting depth of the serrations is set to 75% of the paper thickness, i.e., a die-cutting depth of 0.06 mm.
[0034] Laser cutting technology was used to process needle-tooth cutting edges on a 0.71 mm thick steel plate die. The laser cutting power was set to 800 watts, and the cutting speed was 25 mm per second. The die was mounted on the die-cutting machine, the die-cutting pressure was adjusted to 0.25 MPa, and the die-cutting machine's operating speed was set to 310 packs per minute.
[0035] Adhesion strength tests were conducted on the die-cut products using hot melt adhesive with a coating amount of 12 grams per square meter, a bonding temperature of 145 degrees Celsius, and a pressing time of 0.6 seconds. The test results showed an adhesion strength of 4.5 Newtons per 15 millimeters, a 15.4% improvement compared to the traditional 52° blade process.
[0036] Example 3 This embodiment provides a high-adhesion-strength die-cutting process with 75° blade teeth, the specific steps of which are as follows: A base paper with a basis weight of 90 g / m² and a thickness of 0.12 mm was selected as the substrate. A die-cutting blade with a blade angle of 75° and a blade width of 0.08 mm was used. The tooth pitch of the serrations was set to 1.8 mm, and the tooth width was set to 0.5 mm. The die-cutting depth of the serrations was set to 85% of the paper thickness, i.e., a die-cutting depth of 0.102 mm.
[0037] Laser cutting technology was used to process needle-tooth cutting edges on a 0.71 mm thick steel plate die. The laser cutting power was set to 1200 watts, and the cutting speed was 15 mm per second. The die was mounted on the die-cutting machine, the die-cutting pressure was adjusted to 0.35 MPa, and the die-cutting machine's operating speed was set to 280 packs per minute.
[0038] Adhesion strength tests were conducted on the die-cut products using hot melt adhesive with an application rate of 18 grams per square meter, a bonding temperature of 155 degrees Celsius, and a pressing time of 0.4 seconds. The test results showed an adhesion strength of 5.2 Newtons per 15 millimeters, a 22.4% improvement compared to the traditional 52° blade process.
[0039] Comparative Example 1 This comparative example uses the traditional 52° blade needle-tooth die-cutting process, and the specific steps are as follows: A trademark paper base material with a basis weight of 80 grams per square meter and a thickness of 0.10 millimeters was selected as the substrate, using the same specifications as in Example 1. A die-cutting blade with a blade angle of 52° and a blade edge width of 0.06 millimeters was selected. The tooth pitch of the serrations was set to 1.5 millimeters, and the tooth width was set to 0.4 millimeters. The die-cutting depth of the serrations was set to 80% of the paper thickness, i.e., a die-cutting depth of 0.08 millimeters.
[0040] Laser cutting technology was used to process needle-tooth cutting edges on a 0.71 mm thick steel plate die. The laser cutting power was set to 1000 watts, and the cutting speed was 20 mm per second. The die was mounted on the die-cutting machine, the die-cutting pressure was adjusted to 0.30 MPa, and the die-cutting machine's operating speed was set to 280 packs per minute.
[0041] The adhesive strength of the die-cut products was tested using hot melt adhesive at a coating amount of 15 grams per square meter, a bonding temperature of 150 degrees Celsius, and a pressing time of 0.5 seconds. The test results showed an adhesive strength of 4.05 Newtons per 15 millimeters. However, due to the narrow groove formed by the 52° blade, the flow and diffusion of the adhesive within the groove were limited, resulting in an adhesive strength lower than in Example 1.
[0042] Comparative Example 2 This comparative example uses a 60° blade toothed die-cutting process, and the specific steps are as follows: A trademark paper base material with a basis weight of 80 grams per square meter and a thickness of 0.10 millimeters was selected as the substrate, using the same specifications as in Example 1. A die-cutting blade with a blade angle of 60° and a blade edge width of 0.06 millimeters was selected. The tooth pitch of the serrations was set to 1.5 millimeters, and the tooth width was set to 0.4 millimeters. The die-cutting depth of the serrations was set to 80% of the paper thickness, i.e., a die-cutting depth of 0.08 millimeters.
[0043] Laser cutting technology was used to process needle-tooth cutting edges on a 0.71 mm thick steel plate die. The laser cutting power was set to 1000 watts, and the cutting speed was 20 mm per second. The die was mounted on the die-cutting machine, the die-cutting pressure was adjusted to 0.30 MPa, and the die-cutting machine's operating speed was set to 285 packs per minute.
[0044] The adhesive strength of the die-cut products was tested using hot melt adhesive at a rate of 15 grams per square meter, a bonding temperature of 150 degrees Celsius, and a pressing time of 0.5 seconds. The test results showed an adhesive strength of 4.25 Newtons per 15 millimeters. The groove width formed by the 60° blade was between 52° and 75°, indicating an improvement in adhesive strength, but still lower than in Example 1.
[0045] Comparative Example 3 This comparative example uses a needle-tooth die-cutting process with a 75° blade but insufficient die-cutting depth. The specific steps are as follows: A base paper with a basis weight of 80 grams per square meter and a thickness of 0.10 millimeters was selected as the substrate, using the same specifications as in Example 1. A die-cutting blade with a blade angle of 75° and a blade edge width of 0.06 millimeters was selected. The tooth pitch of the serrations was set to 1.5 millimeters, and the tooth width was set to 0.4 millimeters. The die-cutting depth of the serrations was set to 60% of the paper thickness, i.e., a die-cutting depth of 0.06 millimeters.
[0046] Laser cutting technology was used to process needle-tooth cutting edges on a 0.71 mm thick steel plate die. The laser cutting power was set to 1000 watts, and the cutting speed was 20 mm per second. The die was mounted on the die-cutting machine, the die-cutting pressure was adjusted to 0.22 MPa, and the die-cutting machine's operating speed was set to 300 packs per minute.
[0047] Adhesion strength tests were conducted on the die-cut products using hot melt adhesive at a coating thickness of 15 grams per square meter, a bonding temperature of 150 degrees Celsius, and a pressing time of 0.5 seconds. The test results showed an adhesion strength of 4.15 Newtons per 15 millimeters. Although a 75° cutting edge was used, insufficient die-cutting depth and shallow grooves limited adhesive penetration, preventing the full utilization of the 75° cutting edge's diffusion and flow-guiding advantages.
[0048] Performance Comparison Table 1 compares the process parameters and performance of each embodiment and comparative example: Table 2 compares the viscous viscosity and production efficiency of each embodiment with those of the comparative example: Results Analysis As shown in Tables 1 and 2, compared with Comparative Example 1 which used a 52° blade, Examples 1, 2, and 3, which employed a 75° blade needle-tooth die-cutting process, showed that the adhesion strength was increased by 18.5%, 15.4%, and 22.4%, respectively, the false adhesion rate was reduced to 0.8%, 1.0%, and 0.6%, respectively, and the number of downtime adjustments was reduced from 5 times per shift to 1 to 2 times per shift.
[0049] A comparison of Example 1 and Comparative Example 1 shows that, under the same paper specifications, die-cutting depth, and tooth pitch, changing only the blade angle from 52° to 75° increased the adhesive strength from 4.05 N / 15 mm to 4.8 N / 15 mm, an increase of 18.5%. The V-groove width formed by the 75° blade increased by 21% compared to the 52° blade, and the glue penetration depth increased from 0.028 mm to 0.042 mm, an increase of 50%.
[0050] The comparison between Example 1 and Comparative Example 2 shows that the adhesive strength of the 60° blade is 4.25 Newtons per 15 mm, which is between that of the 52° and 75° blades, but still lower than the 18.5% improvement effect of the 75° blade. The groove width of the 60° blade increases by only 8%, and the glue penetration depth is 0.032 mm, both lower than the performance indicators of the 75° blade.
[0051] A comparison between Example 1 and Comparative Example 3 shows that die-cutting depth has a significant impact on adhesive strength. Although Comparative Example 3 used a 75° die-cutting edge, its die-cutting depth was only 60% of the paper thickness, resulting in insufficient groove depth and an adhesive penetration depth of only 0.025 mm. The adhesive strength was 4.15 Newtons per 15 mm, lower than Example 1 with a die-cutting depth of 80%. This result demonstrates that a 75° die-cutting edge needs to be combined with an appropriate die-cutting depth to fully realize its diffusion and flow advantages.
[0052] Based on the above analysis, this invention, by employing a 75° blade angle and a die-cutting depth of 75% to 85%, can form V-shaped grooves of suitable width and depth on the paper surface. This effectively guides the flow and diffusion of adhesive, increases the contact area and penetration depth between the adhesive and paper fibers, thereby significantly improving adhesion strength, reducing the rate of false adhesion, and increasing production efficiency. In Example 1, the production speed increased from 280 packs per minute in Comparative Example 1 to 300 packs per minute, representing a growth rate of 7.14%.
[0053] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.
[0054] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. A high adhesion strength die cutting process for a 75° knife edge pin tooth line, characterized by, The method comprises the following steps: Step one, raw material preparation: select trademark paper as the base material, prepare the die template; Step two, knife edge parameter setting: select a die cutter with a blade angle of 75°; Step three, pin tooth line parameter setting: the tooth pitch of the pin tooth line is set to 1.2-1.8 mm, the tooth width is set to 0.3-0.5 mm, and the die cutting depth of the pin tooth line is set to 75%-85% of the thickness of the paper; Step four, die template manufacturing: use laser cutting technology to process the pin tooth line on the die template; Step five, die cutting pressure adjustment: install the die template on the die cutting machine and adjust the die cutting pressure to 0.25-0.35 MPa; Step six, die cutting processing: start the die cutting machine for die cutting processing, and the 75° blade forms a V-shaped groove on the surface of the paper.
2. The high adhesion strength die cutting process according to claim 1, wherein, The die cutting depth of the pin tooth line is set to 80% of the thickness of the paper.
3. The high adhesion strength die cutting process according to claim 1, wherein, The basis weight of the trademark paper is 70-90 g / m2, and the thickness is 0.08-0.12 mm.
4. The high adhesion strength die cutting process according to claim 1, wherein, The die template is made of a steel plate with a thickness of 0.71 mm, and the flatness error of the die template is controlled within 0.02 mm.
5. The high adhesion strength die cutting process according to claim 1, wherein, The blade width of the die cutter is 0.05-0.08 mm.
6. The high adhesion strength die cutting process according to claim 1, wherein, In step four, the power of the laser cutting is set to 800-1200 W, the cutting speed is 15-25 mm / s, and the processing accuracy of the blade edge is controlled within ±0.01 mm.
7. The high adhesion strength die cutting process according to claim 1, wherein, In step six, the running speed of the die cutting machine is set to 280-320 packs per minute.
8. The high adhesion strength die cutting process according to claim 1, wherein, It also includes step seven quality detection: quality detection is performed on the die cut product, including die cutting depth and tooth pitch uniformity of the pin tooth line, the die cutting depth is measured by a thickness gauge, and the measurement accuracy is 0.001 mm.