Self-exhausting packaging composite film and self-exhausting flexible packaging bag
By combining an outer layer, an inner layer, a PET strip, a self-adhesive coating, and an adhesive layer, the design solves the problem of poor sealing effect after venting in existing flexible packaging bags, achieving low-cost self-venting and self-sealing functions, and is suitable for self-venting flexible packaging bags.
Patent Information
- Application Number
- CN202520450922.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-03-14
AI Technical Summary
Existing flexible packaging bags suffer from compromised sealing after venting, or one-way valves are too expensive to install, leaving a lack of a low-cost solution that can automatically vent and seal itself.
The structure consists of an outer layer, an inner layer, a PET strip, a self-adhesive coating, and an adhesive layer. The self-adhesive coating opens to release air under pressure and self-adheses and seals after the external force disappears. Combined with the adhesive layer, it provides composite strength, thus achieving self-venting and self-sealing.
It achieves automatic degassing and self-sealing of flexible packaging bags when the internal and external gas pressure difference reaches 300 kPa, at a relatively low cost, and can be used multiple times.
Smart Images
Figure CN223850180U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to soft package technical field, concretely relates to a kind of self-bleeding packaging composite film and a kind of self-bleeding soft package bag. BACKGROUND
[0002] The existing soft package with exhaust function can be divided into one-time exhaust and multiple one-way exhaust. The soft package with one-time exhaust function usually sets weak point at its heat seal to be opened and exhaust, and the sealing effect is destroyed after exhaust and needs to be resealed. The soft package with multiple one-way exhaust function usually realizes through one-way valve, but the setting cost of one-way valve is higher.
[0003] Therefore, another soft package with lower cost, which can automatically exhaust and seal after exhaust, is needed. UTILITY MODEL CONTENT
[0004] In order to solve the above problems of the prior art, the utility model provides a kind of self-bleeding packaging composite film and a kind of self-bleeding soft package bag, which realizes the function of automatic exhaust and self-sealing of soft package after exhaust in another way with lower structure setting cost.
[0005] The disclosed self-bleeding packaging composite film comprises an outer layer, an inner layer, a PET pressing strip, a non-dry adhesive coating and an adhesive layer.
[0006] The PET pressing strip is located between the outer layer and the inner layer, and the upper and lower surfaces of the PET pressing strip are connected to the outer layer and the inner layer through the non-dry adhesive coating respectively, and the outer layer and the inner layer are connected by the adhesive layer on both sides of the PET pressing strip.
[0007] Preferably, the non-dry adhesive coating is an organic silicon modified acrylate non-dry adhesive, which has moderate bonding strength and can be opened under the action of certain air pressure force to achieve the purpose of exhaust, and can be self-adhesive when the external force disappears to achieve the effect of resealing. The non-dry adhesive coating can be used at a temperature as high as 200℃ for a short time, can withstand a low temperature as low as-40℃, and will not lose adhesion at heat sealing and ambient temperature. High humidity has little effect on its adhesion.
[0008] Preferably, the adhesive layer is a two-component polyurethane adhesive with the specific model number XH-750E / K75, so that the outer layer and the inner layer of the composite film have strong composite strength at positions other than the PET pressing strip.
[0009] Preferably, the outer layer is one of OPP film layer, PET film layer and NY film layer.
[0010] Preferably, the inner layer is one of a CPP film layer, a MCPP film layer, and a PE film layer, and the thickness of the inner layer is 20-40 um, such that the inner layer can serve as a heat-seal layer, and the inner layer can be broken due to excessive air pressure at the PET strip, the thickness of the PET strip is 20-30 um, the width of the PET strip is 2-4 mm, and the coating amount of the adhesive coating on the upper and lower surfaces of the PET strip is 5-8 gsm; the soft packaging bag made of the composite film with such specifications can achieve self-venting when the internal and external air pressure difference is 300 Kpa.
[0011] The disclosed self-venting soft packaging bag is formed by heat-sealing connection of the self-venting packaging composite film, and the composite film is heat-sealed and closed at both ends of the soft packaging bag to form heat-seal edges, and the two ends of the PET strip are arranged at the middle of the corresponding heat-seal edges.
[0012] The self-venting and self-sealing principles of the composite film and the soft packaging bag are as follows:
[0013] When the internal air pressure of the self-venting soft packaging bag is high, the inner and outer layers of the composite film are connected by the adhesive layer at positions other than the PET strip, so the composite film has better composite strength at other positions than at the positions provided with the PET strip and the adhesive coating, and can withstand greater air pressure, and thus the inner layer of the composite film at the positions provided with the PET strip can first withstand the high air pressure and be broken;
[0014] When the breakage occurs, the internal gas of the soft packaging bag can slowly push open the adhesive coating, and then be discharged from the two end positions of the PET strip in the direction of the PET strip, and as the internal gas is discharged, the PET strip that is curved due to the inflation of the soft packaging bag can gradually restore the elastic potential energy and press down to make the adhesive coating that is pushed open gradually self-adhere, and the closure of the adhesive coating can be reattached to the broken position of the inner layer to achieve the sealing effect of the composite film and the soft packaging bag again.
[0015] Through the above technical solutions, the utility model at least has the following beneficial effects:
[0016] The self-venting packaging composite film and the self-venting soft packaging bag have simple and exquisite self-venting structures and low setting costs, and through the cooperative design of the outer layer, the inner layer, the PET strip, the adhesive coating, and the adhesive layer, the soft packaging bag can start to vent when the internal and external air pressure difference is greater than 300 Kpa, can be resealed after venting, and can be used for multiple times of venting and sealing. BRIEF DESCRIPTION OF DRAWINGS
[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings, and these drawings are all simplified schematic diagrams, which only schematically show the basic structure of the present application, and thus only show the relevant components of the present application.
[0018] Figure 1 Positional schematic diagram of the PET pressing strip provided on the self-venting soft packaging bag in the embodiments of the present application;
[0019] Figure 2 Cross-sectional view of the self-venting packaging composite film at the PET pressing strip in the embodiments of the present application. DETAILED DESCRIPTION
[0020] In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the position relationship are only used for exemplary illustration, and cannot be understood as a limitation on the present patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to the specific circumstances.
[0021] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be understood broadly, for example, "connection" can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.
[0022] Embodiment 1
[0023] The self-venting packaging composite film of the present embodiment comprises an outer layer 1, an inner layer 4, a PET pressing strip 3, a non-dry adhesive coating 2 and an adhesive layer.
[0024] The PET pressing strip 3 is located between the outer layer 1 and the inner layer 4, and the upper and lower surfaces of the PET pressing strip 3 are connected with the outer layer 1 and the inner layer 4 through the non-dry adhesive coating 2 respectively, and the outer layer 1 and the inner layer 4 are connected through the adhesive layer on both sides of the PET pressing strip 3.
[0025] The non-dry adhesive coating 2 is a silicone-modified acrylate non-dry adhesive, the adhesive strength of the non-dry adhesive coating 2 is moderate, can be opened under the action of a certain air pressure force, so as to achieve the purpose of exhaust, and the non-dry adhesive coating 2 can be self-adhesive after the external force disappears, so as to achieve the effect of resealing; and the non-dry adhesive coating 2 can be used at a temperature as high as 200℃ for a short time, can withstand a low temperature as low as-40℃, does not occur adhesion failure at heat sealing and ambient temperature, and the influence of high humidity conditions on the adhesion performance is also small.
[0026] The adhesive layer is a two-component polyurethane adhesive, and the specific model is XH-750E / K75, so that the outer layer 1 and the inner layer 4 of the composite film have strong composite strength at positions other than the PET pressure strip 3.
[0027] The outer layer 1 is an OPP film layer, and the thickness is 40um, the inner layer 4 is a PE film layer, and the thickness of the inner layer 4 is 30um, such an inner layer 4 can be used as a heat sealing layer, and the inner layer 4 also breaks at the PET pressure strip 3 due to excessive air pressure; the thickness of the PET pressure strip 3 is 25um, the width of the PET pressure strip 3 is 3mm, and the coating amount of the non-dry adhesive coating 2 on the upper and lower surfaces of the PET pressure strip 3 is 7gsm; the soft packaging bag made of the composite film with such specifications can realize self-exhaustion when the internal and external air pressure difference is 300Kpa.
[0028] Reference Figure 2 A self-exhaustion soft packaging bag is formed by the self-exhaustion packaging composite film, the composite film is closed by heat sealing between the inner layers 4 at the two end openings of the soft packaging bag to form heat sealing edges 5, and the two ends of the PET strip are arranged at the middle of the corresponding heat sealing edges 5.
[0029] The principle of self-exhaustion and self-sealing of the composite film and the soft packaging bag is as follows:
[0030] When the internal air pressure of the self-exhaustion soft packaging bag is high, the inner and outer layers of the composite film are connected by the adhesive layer at positions other than the PET pressure strip 3, so compared with the positions provided with the PET pressure strip 3 and the non-dry adhesive coating 2, the composite film has better composite strength at other positions and can withstand greater air pressure, so the inner layer 4 of the composite film breaks first at the position provided with the PET pressure strip 3 due to the high air pressure.
[0031] When the rupture occurs, the internal gas of the soft package bag will slowly push open the adhesive layer 2, and then be discharged along the direction of the PET strip 3 from both ends of the PET strip 3. As the internal gas is discharged, the PET strip 3, which is curved due to the inflation of the soft package bag, will gradually restore the elastic potential energy and be pressed to gradually self-adhere the adhesive layer 2 that is pushed open. The closure of the adhesive layer 2 can be reattached to the rupture of the inner layer 4 to achieve the sealing effect of the composite film and the soft package bag again.
[0032] Embodiment 2
[0033] The self-venting packaging composite film of the embodiment comprises an outer layer 1, an inner layer 4, a PET strip 3, an adhesive layer 2, and an adhesive layer.
[0034] The PET strip 3 is located between the outer layer 1 and the inner layer 4, and the upper and lower surfaces of the PET strip 3 are connected to the outer layer 1 and the inner layer 4 through the adhesive layer 2 respectively. The outer layer 1 and the inner layer 4 are connected through the adhesive layer on both sides of the PET strip 3.
[0035] The adhesive layer 2 is a silicone-modified acrylate adhesive. The adhesive layer 2 has moderate bonding strength and can be opened under the action of a certain gas pressure force to achieve the purpose of venting. When the external force disappears, the adhesive layer 2 can self-adhere to achieve the effect of resealing. The adhesive layer 2 can be used at a temperature as high as 200℃ for a short time, can withstand a low temperature as low as -40℃, and will not fail in adhesion at heat sealing and ambient temperature. The adhesive layer 2 is also less affected by high humidity conditions.
[0036] The adhesive layer is a two-component polyurethane adhesive with a specific model number of XH-750E / K75, so that the outer layer 1 and the inner layer 4 of the composite film have strong composite strength at positions other than the PET strip 3.
[0037] The outer layer 1 is a PET film layer with a thickness of 38um, and the inner layer 4 is an MCPP film layer with a thickness of 20um. Such an inner layer 4 can serve as a heat sealing layer, and the inner layer 4 can also rupture at the PET strip 3 due to excessive gas pressure. The PET strip 3 has a thickness of 30um and a width of 2mm, and the adhesive layer 2 on the upper and lower surfaces of the PET strip 3 has a coating amount of 5gsm respectively. The soft package bag made of the composite film of such specifications can achieve self-venting when the internal and external gas pressure difference is 304Kpa.
[0038] Reference Figure 2 A self-venting soft package bag is formed by heat sealing connection of the self-venting packaging composite film described above. The composite film is heat sealed and closed at both ends of the soft package bag to form heat sealing edges 5, and the two ends of the PET strip are arranged at the middle of the corresponding heat sealing edges 5.
[0039] The principle of self-venting and self-sealing of the composite film and the soft packaging bag is as follows:
[0040] When the internal air pressure of the self-venting soft packaging bag is high, because the inner and outer layers of the composite film are connected by the adhesive layer at positions other than the PET pressing strip 3, the composite film has better composite strength at other positions than the position provided with the PET pressing strip 3 and the pressure-resistant air pressure is also greater, so the inner layer 4 of the composite film at the position provided with the PET pressing strip 3 will first be unable to withstand the high air pressure and will rupture;
[0041] After the rupture occurs at this position, the internal gas of the soft packaging bag will slowly push open the adhesive-free coating 2, and then be discharged along the direction of the PET pressing strip 3 from the positions at both ends of the PET pressing strip 3. As the internal gas is discharged, the PET pressing strip 3, which is curved due to the inflation of the soft packaging bag, will also gradually recover the elastic potential energy and be pressed down to make the pushed-open adhesive gradually self-adhere. The closure of the adhesive-free coating 2 can be reattached to the rupture position of the inner layer 4 to achieve the sealing effect of the composite film and the soft packaging bag again.
[0042] Embodiment 3
[0043] The self-venting packaging composite film of the embodiment comprises an outer layer 1, an inner layer 4, a PET pressing strip 3, an adhesive-free coating 2, and an adhesive layer.
[0044] The PET pressing strip 3 is located between the outer layer 1 and the inner layer 4, and the upper and lower surfaces of the PET pressing strip 3 are respectively connected to the outer layer 1 and the inner layer 4 through the adhesive-free coating 2. The outer layer 1 and the inner layer 4 are connected by the adhesive layer on both sides of the PET pressing strip 3.
[0045] The adhesive-free coating 2 is a silicone-modified acrylate adhesive. The adhesive strength of the adhesive-free coating 2 is moderate, which can be opened under the action of a certain air pressure force to achieve the purpose of venting, and the adhesive-free coating 2 can be self-adhered after the external force disappears to achieve the effect of resealing. The adhesive-free coating 2 can be used at a temperature as high as 200°C for a short time, can withstand a low temperature as low as -40°C, and will not cause adhesive failure at heat sealing and ambient temperature. The influence of high humidity conditions on the adhesive property is also small.
[0046] The adhesive layer is a two-component polyurethane adhesive with a specific model number of XH-750E / K75, so that the outer layer 1 and the inner layer 4 of the composite film have strong composite strength at positions other than the PET pressing strip 3.
[0047] The outer layer 1 is a NY film layer, the thickness is 20 um, the inner layer 4 is a CPP film layer, the thickness of the inner layer 4 is 40 um, the inner layer 4 can be used as a heat sealing layer, the inner layer 4 is also broken due to the high air pressure at the PET pressing strip 3; the thickness of the PET pressing strip 3 is 20 um, the width of the PET pressing strip 3 is 4 mm, the coating amount of the adhesive coating 2 on the upper and lower surfaces of the PET pressing strip 3 is 8 gsm respectively; the soft packaging bag made of the composite film with the above specifications can realize self-venting when the internal and external air pressure difference is 307 Kpa.
[0048] Reference Figure 2 A self-venting soft packaging bag is formed by heat sealing connection of the self-venting packaging composite film, the heat sealing edge 5 is formed by heat sealing between the inner layer 4 at the opening of the soft packaging bag, and the two ends of the PET strip are arranged at the middle of the corresponding heat sealing edge 5.
[0049] The self-venting and self-sealing principles of the composite film and the soft packaging bag are as follows:
[0050] When the internal air pressure of the self-venting soft packaging bag is high, the inner and outer layers of the composite film are connected by the adhesive layer at the position other than the PET pressing strip 3, so the composite film has better composite strength at other positions than the positions provided with the PET pressing strip 3 and the adhesive coating 2, and can withstand greater air pressure, and therefore the inner layer 4 of the composite film at the position provided with the PET pressing strip 3 will first withstand the high air pressure and be broken;
[0051] When the position is broken, the internal gas of the soft packaging bag will slowly push open the adhesive coating 2, and then be discharged from the two end positions of the PET pressing strip 3 in the direction of the PET pressing strip 3, and as the internal gas is discharged, the PET pressing strip 3 curved due to the inflation of the soft packaging bag will gradually restore the elastic potential energy and be pressed down to make the adhesive gradually self-adhere, and the closure of the adhesive coating 2 can be reattached to the broken position of the inner layer 4 to realize the sealing effect of the composite film and the soft packaging bag again.
[0052] The above is only a preferred embodiment of the present application, and is not used to limit the present application, according to the disclosure, the related personnel can make various changes and modifications without deviating from the technical idea of the present application, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A self-venting packaging composite film characterized by: The self-venting packaging composite film comprises an outer layer (1), an inner layer (4), a PET pressing strip (3), a non-dry adhesive coating (2) and an adhesive layer. The PET pressing strip (3) is located between the outer layer (1) and the inner layer (4), and the upper and lower surfaces of the PET pressing strip (3) are connected with the outer layer (1) and the inner layer (4) through the non-dry adhesive coating (2) respectively, and the outer layer (1) and the inner layer (4) are connected through the adhesive layer on both sides of the PET pressing strip (3).
2. The self-venting packaging composite film according to claim 1, characterized in that: The non-dry adhesive coating (2) is an organic silicon modified acrylic ester non-dry adhesive.
3. The self-venting packaging composite film according to claim 1 or 2, characterized in that: The adhesive layer is a two-component polyurethane adhesive.
4. The self-venting packaging composite film according to claim 1 or 2, characterized in that: The outer layer (1) is one of an OPP film layer, a PET film layer and an NY film layer.
5. The self-venting packaging composite film according to claim 2, wherein: The inner layer (4) is one of a CPP film layer, an MCPP film layer and a PE film layer, the thickness of the inner layer (4) is 20-40 um, the thickness of the PET pressing strip (3) is 20-30 um, the width of the PET pressing strip (3) is 2-4 mm, and the coating amount of the non-dry adhesive coating (2) on the upper and lower surfaces of the PET pressing strip (3) is 5-8 gsm respectively.
6. A self-venting flexible pouch characterized by: The self-venting packaging composite film is used for forming a heat-sealed edge (5) by heat-sealing the openings at both ends of a soft packaging bag through the inner layer (4), and the both ends of the PET pressing strip are arranged at the middle of the corresponding heat-sealed edge (5).