A double-branch cigarette blister self-sealing bag based on a multi-layer composite structure

Abstract

This utility model relates to the field of packaging material technology, specifically to a multi-layer composite structure blister pack self-sealing bag for medium / slim cigarettes. It includes a blister pack body for medium / slim cigarettes, composed of an outer layer, a middle layer, and an inner layer. The outer, middle, and inner layers are respectively made of food-grade biaxially oriented polypropylene, aluminized polyester film, and cast polypropylene. A thickened self-sealing strip is integrally sealed on both sides of the inner wall of the blister pack body near the bag opening. Easy-tear openings are provided on both sides of the blister pack body near the top of the thickened self-sealing strip. The entire structure uses a three-layer composite structure of OPP / aluminized PET / CPP, and corona treatment improves printing adhesion. The PET aluminized layer achieves an OTR ≤ 1.5cm. 3 / m 2 With a high barrier performance of 24h·atm, combined with co-extruded PP teeth and blister positioning grooves, it has the functions of moisture protection, pressure resistance and precise positioning, and can be widely used in high-end sealed packaging in tobacco, food and other fields.

Description

Technical Field

[0001] This utility model relates to the field of packaging materials technology, specifically to a blister pack self-sealing bag for medium / slim cigarettes based on a multi-layer composite structure. Background Technology

[0002] Cigarette packaging bags prevent cigarettes from getting damp and from losing moisture quickly, thus protecting the quality and taste of the cigarettes. They also prevent the volatile aromatic substances in the formula from being lost too quickly, ensuring that the aroma and flavor of the cigarettes remain stable.

[0003] However, existing cigarette packaging bags generally suffer from the following defects: First, insufficient barrier properties: Traditional single-layer plastics such as PE, PP, or ordinary composite films such as OPP / CPP have high oxygen and water vapor permeability (OTR > 100 cm³ / m²·24h·atm), making cigarettes susceptible to moisture and oxidation, thus shortening their shelf life; Second, poor sealing reliability: Ordinary zippers, due to material aging (e.g., PVC zippers are prone to brittleness) or structural design defects (e.g., loose meshing of the teeth), have a greater than 30% probability of seal failure after repeated opening and closing; Third, hygiene risks: Non-food grade materials, such as phthalate-containing plasticizers, may contaminate the contents, failing to meet the GB 4806.7-2016 standard "Plastic Materials and Products for Food Contact"; Finally, low process compatibility: Eight-color printing conflicts with the composite film heat-sealing process, and insufficient ink adhesion leads to a print wear rate > 15%.

[0004] Therefore, it is necessary to design a blister pack self-sealing bag for medium / slim cigarettes based on a multi-layer composite structure to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this utility model is to provide a blister pack self-sealing bag for medium / slim cigarettes based on a multi-layer composite structure. This blister pack self-sealing bag for medium / slim cigarettes adopts a three-layer composite structure of OPP / PET aluminized / CPP. Corona treatment is used to improve printing adhesion, and the PET aluminized layer achieves high barrier performance with OTR ≤ 1.5 cm³ / m²·24h·atm. Combined with co-extruded PP teeth and blister positioning groove, it has the functions of moisture protection, pressure resistance and precise positioning, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A multi-layer composite structure for a double-pack of medium / slim cigarettes vial-forming self-sealing bag includes a main body for the double-pack of medium / slim cigarettes. The main body is composed of an outer layer, a middle layer, and an inner layer. The outer, middle, and inner layers are respectively made of food-grade biaxially oriented polypropylene, polyester aluminized film, and cast polypropylene. A thickened self-sealing strip is integrally sealed on both sides of the inner wall of the main body near the bag opening. An easy-tear opening is provided on both sides of the main body near the top of the thickened self-sealing strip. The bottom of the main body has a widened design. A blister positioning groove for the double cigarettes is molded into the inner side of the main body.

[0008] As a preferred embodiment of this utility model, the thicknesses of the outer layer, the middle layer, and the inner layer are 2.3±0.1 mil, 1.2±0.05 mil, and 4.5±0.2 mil, respectively, and the total thickness is 8.0±0.3 mil.

[0009] As a preferred embodiment of this utility model, the outer surface is corona treated and has a dyne value ≥38mN / m, and an eight-color printing process is used, while the ink peel strength of the printed area is ≥3.5N / 15mm.

[0010] As a preferred embodiment of this utility model, the aluminum layer of the intermediate layer has a thickness ≥300Å, an oxygen permeability ≤1.5cm³ / m²·24h·atm, and a water vapor permeability WVTR ≤0.8 g / m²·24h.

[0011] As a preferred embodiment of this utility model, the heat sealing strength of the inner layer is ≥25N / 15mm, and the heat sealing temperature range is 110~130℃.

[0012] As a preferred embodiment of this utility model, the thickened self-sealing strip includes an infeed strip, a connecting strip, and a pressing edge. The infeed strip and the connecting strip are snapped together, and the infeed strip and the connecting strip are fixedly connected to the main body of the blister self-sealing bag through the pressing edge.

[0013] As a preferred embodiment of this utility model, the thickened self-sealing strip is made of food-grade polypropylene, with a tooth height of 0.8mm, a tooth pitch of 1.0±0.1mm, and is integrally formed with the bag body through a co-extrusion process. The interface bonding strength is ≥8N / 15mm, the peel force after closing is ≥15N / 15mm, and the opening and closing life is ≥50 times.

[0014] As a preferred embodiment of this utility model, the depth of the blister positioning groove is 2.0 mm, and it is suitable for cigarettes with a circumference of 16.5~17.0 mm.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] Compared with the traditional OPP / PE structure, the overall barrier performance of this invention is improved, and the OTR is reduced by 98%, from 100 to 1.5 cm³ / m²·24h·atm, which can extend the shelf life of cigarettes to 18 months.

[0017] In this invention, the meshing area of ​​the pull teeth is increased by 30%, and the opening and closing life is increased to more than 50 times, which is stronger than the industry average of 20 times in terms of overall sealing reliability.

[0018] This utility model is made entirely of food-grade materials, conforming to the GB 4806.7-2016 standard "Plastic Materials and Products for Food Contact", and has a high hygiene coefficient.

[0019] In this invention, the outer OPP layer is corona-treated to achieve synergy between eight-color printing and composite processes, improving ink adhesion by 40% and providing high process compatibility. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of the main composite layer of the blister self-sealing bag in this utility model;

[0021] Figure 2 This is a frontal view of the external structure of the blister self-sealing bag body in this utility model;

[0022] Figure 3 This is a frontal view of the internal structure of the blister self-sealing bag body in this utility model;

[0023] Figure 4 This is a partially enlarged planar structural diagram of the thickened self-sealing strip in this utility model;

[0024] Figure 5 This is a schematic diagram of the external structure of the blister self-sealing bag body from a bottom view in this utility model;

[0025] Figure 6 This is a schematic diagram of the cross-sectional planar structure of the vacuum forming positioning groove in this utility model.

[0026] In the picture: 1. Body of the blister self-sealing bag; 2. Outer layer; 3. Middle layer; 4. Inner layer; 5. Thickened self-sealing strip; 51. Inlet strip; 52. Sealing strip; 53. Pressed edge; 6. Easy-tear opening; 7. Widened bottom design; 8. Blister positioning groove. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0028] Example 1 (Standard Type):

[0029] Please see Figures 1-6 This utility model provides a technical solution:

[0030] A self-sealing blister pack for medium / slim cigarettes based on a multi-layer composite structure includes a blister pack body 1 for medium / slim cigarettes. The blister pack body 1 is composed of an outer layer 2, a middle layer 3, and an inner layer 4. The outer layer 2, middle layer 3, and inner layer 4 are made of food-grade biaxially oriented polypropylene, a polyester aluminized film, and a cast polypropylene material, respectively. It adopts a three-layer composite structure of OPP / PET aluminized / CPP. The printing adhesion is improved by corona treatment. The PET aluminized layer achieves a high barrier performance of OTR≤1.5 cm³ / m²·24h·atm. The three-layer composite sequence is: OPP outer layer → adhesive layer → PET aluminized layer → adhesive layer → CPP inner layer. At the same time, a two-component polyurethane adhesive with a solid content of 35% is used, the coating amount is 3.5g / m², and the curing temperature is 40℃×48h.

[0031] The outer layer 2, middle layer 3, and inner layer 4 have thicknesses of 2.3±0.1 mil, 1.2±0.05 mil, and 4.5±0.2 mil, respectively, with a total thickness of 8.0±0.3 mil. The outer layer 2 is corona-treated with a dyne value ≥38mN / m and uses an eight-color printing process. The ink peel strength of the printed area is ≥3.5N / 15mm. The aluminum layer thickness of the middle layer 3 is ≥300Å, with an oxygen permeability ≤1.5 cm³ / m²·24h·atm and a water vapor permeability (WVTR) ≤0.8. g / m²·24h, the heat sealing strength of the inner layer 4 is ≥25N / 15mm, the heat sealing temperature range is 110~130℃, and the OPP layer is treated with corona to achieve synergy between eight-color printing and composite process, the ink adhesion is improved by 40%, and the power of OPP film corona treatment is 5kW, the speed is 20m / min, and the PET aluminized film is deposited with aluminum layer under vacuum degree ≤5×10⁻³Pa;

[0032] Furthermore, in this embodiment, please refer to Figure 3 and Figure 4The inner walls of the blister self-sealing bag body 1 are integrally sealed with thickened self-sealing strips 5 near the bag opening on both sides. The thickened self-sealing strip 5 includes an inlet strip 51, a connecting strip 52, and a pressing edge 53. The inlet strip 51 and the connecting strip 52 are snapped together, and the inlet strip 51 and the connecting strip 52 are fixedly connected to the bag body 1 of the blister self-sealing bag body through the pressing edge 53. The thickened self-sealing strip 5 is made of food-grade polypropylene material, with a tooth height of 0.8mm and a tooth pitch of 1.0±0.1mm. It is integrally formed with the bag body through a co-extrusion process, with an interface bonding strength ≥8N / 15mm, a peel force after closing ≥15N / 15mm, and an opening and closing life ≥50 times. The tooth meshing area is increased by 30%, and the opening and closing life is increased to more than 50 times. The PP melt is directly extruded to the edge of the bag opening using a co-extrusion die at a temperature of 210℃. After cooling and shaping, it forms an integrated zipper.

[0033] Furthermore, in this embodiment, please refer to Figure 2 , Figure 3 and Figure 5 The blister self-sealing bag body 1 has easy-tear openings 6 on both sides near the top of the thickened self-sealing strip 5. The bottom of the blister self-sealing bag body 1 has a widened bottom design 7. The blister self-sealing bag body 1 is made of double-sided aluminum foil, which has excellent light blocking performance, good airtightness, and strong puncture resistance. The easy-tear openings 6 greatly improve the convenience of use. At the same time, the widened bottom design 7 makes the overall packaging effect better, more three-dimensional, and enhances the grade.

[0034] Furthermore, in this embodiment, please refer to Figure 3 and Figure 6 The inner side of the blister self-sealing bag body 1 is molded to form a blister positioning groove 8 for two cigarettes. The depth of the blister positioning groove 8 is 2.0mm, and it is suitable for cigarettes with a circumference of 16.5~17.0mm.

[0035] Example 2 (Extended):

[0036] Please see Figures 1-6 This utility model provides a technical solution:

[0037] A multi-layer composite structure for a double-pack of medium / slim cigarettes vial-shaped blister packs includes a blister pack body 1 for the double-pack of medium / slim cigarettes. The blister pack body 1 is composed of an outer layer 2, a middle layer 3, and an inner layer 4. The outer layer 2, middle layer 3, and inner layer 4 are respectively made of food-grade biaxially oriented polypropylene, aluminized polyester film, and cast polypropylene material. It adopts an OPP / PET aluminized / CPP three-layer composite structure. Corona treatment is used to improve printing adhesion. The middle layer is replaced with 7μm aluminum foil, and the OTR is reduced to 0.5 cm³ / m²·24h·atm. The three-layer composite sequence is: OPP outer layer → adhesive layer → PET aluminized → adhesive layer → CPP inner layer. At the same time, a two-component polyurethane adhesive with a solid content of 35% is used, the coating amount is 3.5g / m², and the curing temperature is 40℃×48h.

[0038] The outer layer 2, middle layer 3, and inner layer 4 have thicknesses of 2.3±0.1 mil, 1.2±0.05 mil, and 4.5±0.2 mil, respectively, with a total thickness of 8.0±0.3 mil. The outer layer 2 is corona-treated with a dyne value ≥38mN / m and uses an eight-color printing process. The ink peel strength of the printed area is ≥3.5N / 15mm. The aluminum layer thickness of the middle layer 3 is ≥300Å, with an oxygen permeability ≤1.5 cm³ / m²·24h·atm and a water vapor permeability (WVTR) ≤0.8. g / m²·24h, the heat sealing strength of the inner layer 4 is ≥25N / 15mm, the heat sealing temperature range is 110~130℃, and the OPP layer is treated with corona to achieve synergy between eight-color printing and composite process, the ink adhesion is improved by 40%, and the power of OPP film corona treatment is 5kW, the speed is 20m / min, and the PET aluminized film is deposited with aluminum layer under vacuum degree ≤5×10⁻³Pa;

[0039] Furthermore, in this embodiment, please refer to Figure 3 and Figure 4 The inner walls of the blister self-sealing bag body 1 are integrally sealed with thickened self-sealing strips 5 near the bag opening on both sides. The thickened self-sealing strip 5 includes an inlet strip 51, a connecting strip 52, and a pressing edge 53. The inlet strip 51 and the connecting strip 52 are snapped together, and the inlet strip 51 and the connecting strip 52 are fixedly connected to the bag body 1 of the blister self-sealing bag body through the pressing edge 53. The thickened self-sealing strip 5 is made of food-grade polypropylene material, with a tooth height of 0.8mm and a tooth pitch of 1.0±0.1mm. It is integrally formed with the bag body through a co-extrusion process, with an interface bonding strength ≥8N / 15mm, a peel force after closing ≥15N / 15mm, and an opening and closing life ≥50 times. The tooth meshing area is increased by 30%, and the opening and closing life is increased to more than 50 times. The PP melt is directly extruded to the edge of the bag opening using a co-extrusion die at a temperature of 210℃. After cooling and shaping, it forms an integrated zipper.

[0040] Furthermore, in this embodiment, please refer to Figure 2 , Figure 3 and Figure 5 The blister self-sealing bag body 1 has easy-tear openings 6 on both sides near the top of the thickened self-sealing strip 5. The bottom of the blister self-sealing bag body 1 has a widened bottom design 7. The blister self-sealing bag body 1 is made of double-sided aluminum foil, which has excellent light blocking performance, good airtightness, and strong puncture resistance. The easy-tear openings 6 greatly improve the convenience of use. At the same time, the widened bottom design 7 makes the overall packaging effect better, more three-dimensional, and enhances the grade.

[0041] Furthermore, in this embodiment, please refer to Figure 3 and Figure 6 The inner side of the blister self-sealing bag body 1 is molded to form a blister positioning groove 8 for two cigarettes. The depth of the blister positioning groove 8 is 1.8mm, and it is suitable for cigarettes with a circumference of less than or equal to 16.0mm. At the same time, the width of the blister self-sealing bag body 1 is reduced to 52mm.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A blister pack self-sealing bag for medium / slim cigarettes based on a multi-layer composite structure, comprising a blister pack self-sealing bag body (1) for medium / slim cigarettes, characterized in that: The blister self-sealing bag body (1) is composed of an outer layer (2), a middle layer (3), and an inner layer (4). The outer layer (2), the middle layer (3), and the inner layer (4) are made of food-grade biaxially oriented polypropylene, polyester aluminized film, and cast polypropylene materials, respectively. The inner walls of the blister self-sealing bag body (1) are integrally sealed with thickened self-sealing strips (5) near the bag opening on both sides. The blister self-sealing bag body (1) is provided with easy-tear openings (6) near the top of the thickened self-sealing strips (5) on both sides. The bottom of the blister self-sealing bag body (1) is provided with a bottom widening design (7). The inner side of the blister self-sealing bag body (1) is molded to form a blister positioning groove (8) for two cigarettes.

2. The self-sealing blister pack for medium / slim cigarettes based on a multi-layer composite structure according to claim 1, characterized in that: The thicknesses of the outer layer (2), the middle layer (3), and the inner layer (4) are 2.3±0.1 filaments, 1.2±0.05 filaments, and 4.5±0.2 filaments, respectively, and the total thickness is 8.0±0.3 filaments.

3. The self-sealing blister pack for medium / slim cigarettes based on a multi-layer composite structure according to claim 2, characterized in that: The outer layer (2) surface is corona treated and has a dyne value ≥38mN / m, and is printed using an eight-color printing process. At the same time, the ink peel strength of the printed area is ≥3.5N / 15mm.

4. A self-sealing blister pack for medium / slim cigarettes based on a multi-layer composite structure according to claim 2, characterized in that: The intermediate layer (3) Oxygen permeability ≤1.5cm 3 / m 2 Water vapor transmission rate (WVTR) ≤ 0.8 g / m² (24 h atm) 2 ·24h.

5. A self-sealing blister pack for medium / slim cigarettes based on a multi-layer composite structure according to claim 2, characterized in that: The heat sealing strength of the inner layer (4) is ≥25N / 15mm, and the heat sealing temperature range is 110~130℃.

6. A self-sealing blister pack for medium / slim cigarettes based on a multi-layer composite structure according to claim 1, characterized in that: The thickened self-sealing strip (5) includes an infeed strip (51), a connecting strip (52), and a pressing edge (53). The infeed strip (51) and the connecting strip (52) are snapped together, and the infeed strip (51) and the connecting strip (52) are fixedly connected to the body of the blister self-sealing bag (1) through the pressing edge (53).

7. A self-sealing blister pack for medium / slim cigarettes based on a multi-layer composite structure according to claim 1, characterized in that: The thickened self-sealing strip (5) is made of food-grade polypropylene, with a tooth height of 0.8mm, a tooth pitch of 1.0±0.1mm, and is integrally formed with the bag body through a co-extrusion process. The interface bonding strength is ≥8N / 15mm, the peeling force after closing is ≥15N / 15mm, and the opening and closing life is ≥50 times.

8. A self-sealing blister pack for medium / slim cigarettes based on a multi-layer composite structure according to claim 1, characterized in that: The depth of the blister positioning groove (8) is 2.0 mm, and it is suitable for cigarettes with a circumference of 16.5 to 17.0 mm.

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