Two-component epoxy adhesive extrusion packaging bag

Abstract

The utility model discloses a two component epoxy glue extrusion type packing bag, this packing bag is two joint package structure, and the packing bag body includes first bag piece and second bag piece, and all are multilayer composite structure. Multilayer composite structure is through the synergistic effect of each layer, and effectively protects internal epoxy glue from the influence of external environment. Packing bag material high strength, corrosion -resistant, heat -insulating good, and reliability is guaranteed in combination bottom support structure and stiffener, can tear the mouth and fill the open mouth convenient use and production, and preparation high -efficient, can large -scale production. The bottom support is convenient for processing and storage transportation simultaneously, saves the space. Optimization material selection reduces the cost. It is outstanding in the operation convenience, performance stability, structural reliability and production efficiency and cost benefit aspect, provides innovative, efficient, reliable packing solution for two component epoxy glue, has wide application prospect.

Description

Technical Field

[0001] This utility model relates to the field of packaging technology, and more specifically, to a two-component epoxy extrusion packaging bag. Background Technology

[0002] The description of the background technology is merely a general description for the convenience of understanding the content of this utility model and does not constitute any limitation on this utility model.

[0003] In existing technologies, two-component epoxy adhesives typically come in two separate packages. Before use, component A and component B must be removed separately, poured into a single container, and manually mixed. For example, syringe-type and aluminum tube-type packages require both components to be squeezed into one container and mixed with a stirring rod before use. This method is cumbersome and prone to contamination and waste during external mixing. Furthermore, in terms of display, traditional packaging usually cannot stand upright and requires additional supports or specific display methods. This not only increases the difficulty of supermarket displays but also results in poor shelf presentation, failing to attract consumer attention. Simultaneously, traditional packaging lacks adaptability to different usage scenarios and needs. With only fixed specifications, it cannot meet the diverse usage requirements of consumers, potentially leading to purchasing difficulties – either buying too much and wasting it, or too little and failing to meet actual needs. Moreover, traditional packaging occupies significant space during storage and transportation, increasing costs.

[0004] Therefore, as people's demands for product quality and ease of use continue to increase, there is an urgent need to find a new type of two-component epoxy adhesive packaging that has the following advantages: Easy operation: mixing can be achieved within the bag simply by squeezing, eliminating the need for additional containers and manual stirring, greatly simplifying the operation process; Clean and hygienic: avoiding the pollution and waste problems caused by traditional external mixing, ensuring the purity of the epoxy adhesive; Good display: the upright structure facilitates display in supermarkets and stores, attracting consumer attention; Meets different needs: different capacity specifications are available, allowing consumers to choose according to their actual needs, avoiding waste or shortages, and effectively solving the problems of cumbersome mixing, pollution and waste risks, inconvenient supermarket display, and limited specifications associated with traditional packaging. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a two-component epoxy adhesive extrusion packaging bag. By designing two connected bag bodies and sealing them with heat, components A and B can be mixed within the bag through extrusion. The bag body features a composite layer structure and includes a heat-absorbing sheet layer. This heat-absorbing sheet is made of a material with high thermal conductivity and good thermal stability, used to quickly absorb the heat generated during epoxy adhesive mixing, maintaining the stability of the adhesive solution. This solves the problem of excessively high localized temperatures affecting epoxy adhesive performance and quality caused by the lack of effective heat absorption measures in traditional packaging. Simultaneously, a bottom support structure is provided at the bottom of the packaging bag, with reinforcing ribs at the bottom edge of the bottom support structure, and heat-absorbing sheets are placed on the inner surface of the bottom support structure of the A and B component bags. This design has many advantages. Firstly, it greatly improves the convenience of operation. No additional containers or mixing tools are needed; users can mix components A and B simply by gently squeezing, solving the cumbersome problem of manually mixing components separately in containers using traditional packaging, saving time and labor costs, and improving work efficiency. On the other hand, the upright, square base design increases the stability of the packaging bags when displayed in supermarkets and other venues, making them more neat and aesthetically pleasing. This solves the problem of traditional packaging being inconvenient to display in supermarkets, attracting consumers' attention and enhancing product display and brand image. Furthermore, by offering different capacity options, it meets the usage needs of different users in different scenarios, addressing the issue of traditional packaging's limited size failing to meet diverse needs.

[0006] To achieve the above objectives, this utility model adopts the following solution: On the one hand, this utility model provides a squeeze-type packaging bag, including a bag body and an inner cavity formed therefrom, the bag body including a heat-sealed opening, the heat-sealed opening being used to separate the inner cavity so that the bag body forms at least two independent inner cavities; the bag body is provided with heat-absorbing sheets for absorbing heat.

[0007] Traditional two-component epoxy adhesives are typically packaged in two separate containers. Components A and B must be removed separately and poured into a single container for manual mixing. This traditional packaging method has several significant drawbacks. First, the operation is extremely cumbersome, requiring not only an additional container but also mixing tools. This undoubtedly increases the complexity of use, making the entire process lengthy and laborious, significantly increasing time costs. For manufacturers, this means consuming more manpower and time resources during production, reducing efficiency. For users, the series of complex operations required in actual use causes inconvenience, increases the difficulty and time investment, and the mixing process in an external container is highly susceptible to contamination.

[0008] Therefore, in some embodiments, the inventors designed a two-component epoxy resin extrusion packaging bag with a two-pack structure. The two-pack structure houses components A and B of the epoxy resin in two connected inner cavities of the bag (similarly, different cavities can also hold the same components). In practical use, the user only needs to squeeze the packaging bag to quickly mix components A and B, eliminating the need for additional containers or stirring tools, greatly simplifying the operation and saving time. Simultaneously, this structural design facilitates filling operations during production. Components A and B can be accurately filled separately, ensuring accuracy and efficiency, thereby improving production efficiency and product quality stability. Furthermore, the simplified operation not only improves ease of use but also reduces the risk of product quality problems due to improper operation. The two-pack structure also makes product storage and transportation more convenient, reducing the risk of collision and leakage that may arise from two separate containers.

[0009] Furthermore, the bag body includes a first bag piece and a second bag piece, the edges of the first bag piece and the second bag piece are provided with a side sealing area, and the first bag piece and the second bag piece are connected through the side sealing area to form the inner cavity.

[0010] Furthermore, the first bag sheet is composed of a multi-layer structure; the multi-layer structure includes an inner bag sheet layer, a heat-absorbing sheet layer, and an outer bag sheet layer, wherein the heat-absorbing sheet layer is located between the inner bag sheet layer and the outer bag sheet layer, and the heat-absorbing sheet layer includes heat-absorbing sheets.

[0011] Furthermore, the material of the inner bag sheet includes any one or more combinations of low-density polyethylene, modified polypropylene, linear low-density polyethylene, polypropylene, and high-density polyethylene.

[0012] Furthermore, the material of the outer bag layer includes any one or more combinations of low-density polyethylene, modified polypropylene, linear low-density polyethylene, polypropylene, and high-density polyethylene.

[0013] Furthermore, the material of the heat-absorbing sheet includes any one or more combinations of silicone rubber, polyester rubber, HDPE plastic, polyurethane, and PA plastic.

[0014] In some implementations, traditional epoxy adhesive packaging lacks heat absorption measures, leading to localized heat accumulation and temperature increases during mixing, which affects the performance and quality of the epoxy adhesive. This includes accelerating curing, impacting construction, and altering the molecular structure, thus reducing performance indicators. This invention uses a multi-layered structure for the two-component epoxy adhesive extrusion packaging bag, including a heat-absorbing layer. This heat-absorbing layer is made of a material with high thermal conductivity and good thermal stability, such as polyester rubber, which can quickly absorb the heat generated during mixing, maintain the stability of the adhesive, ensure the chemical reaction proceeds under the expected conditions, guarantee the curing effect and performance indicators, prevent deterioration and aging, and extend service life. During storage and transportation, the heat-absorbing layer works in conjunction with the insulation material to buffer and regulate the temperature, avoiding the impact of temperature changes, and uniformly absorbs heat to prevent localized overheating or overcooling, improving quality stability. Due to its specific material preparation, it is tightly bonded to the base and the main body of the packaging bag, preventing detachment and displacement, ensuring the overall performance and reliability of the packaging bag.

[0015] Furthermore, the hot-press seal extends to the edge sealing area.

[0016] Furthermore, the heat-sealed opening includes a sealing strip inside.

[0017] In some embodiments, the heat-sealing is an integral part of the bag body, extending to the side sealing area. Structurally and functionally, it is closely connected to other parts of the bag body, jointly ensuring the performance of the extrusion packaging bag of this utility model.

[0018] Furthermore, the heat-sealing material includes any one or more combinations of low-density polyethylene, modified polypropylene, linear low-density polyethylene, polypropylene, and high-density polyethylene.

[0019] Furthermore, the bag body includes a base structure, and the inner surface of the base structure includes heat-absorbing sheets.

[0020] Furthermore, the base structure includes a square base structure, a circular base structure, an elliptical base structure, or a triangular base structure.

[0021] In some embodiments, the base structure is used to improve the stable support of the squeeze-pack bag, enhance structural strength, or optimize storage and transportation.

[0022] Furthermore, the base structure material includes any one or more combinations of low-density polyethylene, modified polypropylene, linear low-density polyethylene, polypropylene, and high-density polyethylene.

[0023] In some implementations, traditional epoxy adhesive packaging lacks heat absorption measures, leading to localized heat accumulation and temperature increases during mixing. This negatively impacts the performance and quality of the epoxy adhesive, including accelerating curing and affecting construction, altering molecular structure, and reducing performance indicators. This invention also incorporates heat-absorbing sheets on the inner surface of the bottom tray of the two-component epoxy adhesive extrusion packaging bag. Using materials with high thermal conductivity and good thermal stability, such as polyester rubber, these sheets quickly absorb the heat generated during mixing, maintaining the stability of the adhesive solution, ensuring the chemical reaction proceeds under the expected conditions, guaranteeing curing effect and performance indicators, preventing deterioration and aging, and extending service life. During storage and transportation, the heat-absorbing sheets, in conjunction with insulation materials, buffer and regulate temperature, avoiding the impact of temperature fluctuations. Uniform heat absorption prevents localized overheating and overcooling, improving quality stability.

[0024] Furthermore, the base structure includes reinforcing ribs.

[0025] In some embodiments, the reinforcing ribs are used to enhance the stability of the squeeze-pack bag.

[0026] Furthermore, the material of the reinforcing rib includes any one or more combinations of polypropylene, polyethylene, polyamide, polycarbonate, acrylonitrile-butadiene-styrene, polyester (PET), polyoxymethylene, and thermoplastic elastomer.

[0027] Furthermore, the squeeze-type packaging bag also includes a tear-off opening and a filling opening; the tear-off opening is located at the long edge of the bag body.

[0028] In this invention, the "long side" of the bag refers to the two relatively longer sides of the bag in its naturally unfolded state before the two-component epoxy resin is filled. Typically, the long side and short side of the bag are perpendicular, and the length of the long side is greater than that of the short side. This definition based on length difference is significant in the structural design and practical use of packaging bags. From a structural design perspective, placing the tear-off opening at the edge of the long side fully considers both user convenience and the overall stability of the packaging bag structure. Compared to the short side, the long side offers more operating space, allowing users to apply force more naturally and comfortably when opening the tear-off opening to remove the mixed epoxy resin components, reducing operational difficulty and improving efficiency. Simultaneously, the position of the long side facilitates the processing and fabrication of the tear-off opening during production, ensuring its quality and consistency. In practical applications, when the packaging bag is placed on a flat surface, the long side is often in a position more easily accessible to the user. Whether in a laboratory, production workshop, or home environment, users typically find it easier to locate and open the tear-off opening from the longer edge, avoiding unnecessary compression or damage to the packaging bag while searching for it, thus ensuring the epoxy adhesive is in good condition before use. Furthermore, from a mechanical perspective, when the bag is subjected to external forces, the longer side can withstand greater tensile and torque forces than the shorter side. Placing the tear-off opening on the longer side effectively disperses the stress applied to the packaging bag during opening, reducing the risk of bag breakage or damage due to stress concentration, ensuring the integrity and reliability of the packaging bag, and thus ensuring the safety and stability of the two-component epoxy adhesive during packaging, storage, and use.

[0029] In some embodiments, the tear-away opening is used to open the packaging bag to remove the mixed components.

[0030] Furthermore, the filling opening is located in the long side seal area of ​​the packaging bag; the filling opening is marked.

[0031] In some implementations, the filling opening is sealed after filling. The markings at the filling opening facilitate quick identification of the filling location.

[0032] Furthermore, the filling opening material includes any one or more combinations of low-density polyethylene, modified polypropylene, linear low-density polyethylene, polypropylene, and high-density polyethylene.

[0033] On the other hand, this utility model provides a method for preparing a squeeze-type packaging bag as described in any of the above technical solutions, comprising: bag sheet production, wherein the bag sheet includes a first bag sheet and a second bag sheet.

[0034] In some embodiments, the two-pack structure of this invention allows the A and B components of the epoxy adhesive to be mixed inside the packaging bag. This process generates heat and places higher demands on the sealing, strength, and thermal insulation performance of the packaging material. Traditional two-component epoxy adhesive packaging cannot meet the requirements of mixing components A and B within the same package while ensuring a safe and stable mixing process, preventing leakage, and maintaining a suitable temperature. Issues may arise such as insufficient heat dissipation leading to excessively high local temperatures affecting epoxy adhesive performance, insufficient sealing causing leakage resulting in waste and pollution, and insufficient strength to withstand internal pressure changes leading to rupture. Therefore, the inventors designed the packaging bag as a multi-layer composite structure, including an inner bag sheet layer, a heat-absorbing sheet layer, and an outer bag sheet layer. The inner bag sheet layer is in direct contact with the epoxy adhesive, protecting it from contamination, and also has good heat transfer properties, enabling rapid transfer of the heat generated during epoxy adhesive mixing to the heat-absorbing sheet layer. The heat-absorbing sheet layer is equipped with heat-absorbing sheets to quickly absorb the heat generated during epoxy resin mixing, preventing excessively high local temperatures from adversely affecting the epoxy resin's performance. During storage and transportation, it also works in conjunction with the outer bag layer to buffer and regulate temperature. The outer bag layer provides external protection for the packaging bag, possessing high strength and hardness to resist external damage, good corrosion resistance to resist external chemical corrosion, and moderate thermal insulation performance to prevent excessive external heat from transferring into the packaging bag and affecting the epoxy resin's performance. Simultaneously, it does not feel overheated when held, improving the user experience. This multi-layered composite structure solves the defects of traditional two-component epoxy resin packaging, such as easy localized overheating, insufficient sealing, and low strength leading to breakage. It ensures stable epoxy resin performance, prevents leakage and waste, and improves the overall reliability of the packaging bag.

[0035] Meanwhile, to further meet or improve the overall performance of the packaging bag of this utility model, after improving the heat-absorbing sheet material, the materials of the inner and outer bag layers were also screened accordingly. The results show that, to achieve the optimal performance of the two-component epoxy extrusion packaging bag, the inner bag layer material should preferably be modified polypropylene, combined with a specific heat-absorbing sheet material (polyester rubber) to achieve good heat transfer and temperature regulation effects, ensuring the stability of the epoxy adhesive performance. For the outer bag layer material, considering all factors, high-density polyethylene is preferred as the outer bag layer material, possessing excellent resistance to external forces, resistance to external environmental corrosion, good sealing performance, outstanding heat insulation performance, and optimal external protection and temperature control performance.

[0036] Furthermore, the material of the inner bag sheet includes any one or more combinations of low-density polyethylene, modified polypropylene, linear low-density polyethylene, polypropylene, and high-density polyethylene.

[0037] Furthermore, the material of the outer bag layer includes any one or more combinations of low-density polyethylene, modified polypropylene, linear low-density polyethylene, polypropylene, and high-density polyethylene.

[0038] Furthermore, the material of the heat-absorbing sheet includes any one or more combinations of silicone rubber, polyester rubber, HDPE plastic, polyurethane, and PA plastic.

[0039] Because heat absorbers made of different materials exhibit varying performance characteristics, further material selection was conducted in some embodiments to ensure optimal performance. Results showed that only when polyester rubber was preferred did the heat absorber achieve the best overall performance in terms of thermal conductivity, thermal stability, and bonding strength: high thermal conductivity, enabling rapid absorption of heat generated during the mixing of the AB component epoxy resin, preventing localized overheating; good thermal stability, maintaining stable performance within a certain temperature range, ensuring effective operation under different environments; excellent compatibility with epoxy resin, not adversely affecting its performance after long-term contact, and exhibiting no significant changes itself; and high bonding strength, firmly bonded to the base structure and the main body of the packaging bag, preventing detachment or displacement during use, thus ensuring the overall performance and reliability of the packaging bag. Therefore, polyester rubber is the preferred material for preparing the heat absorber.

[0040] Furthermore, the preparation method also includes the fabrication of a side sealing area, a heat-sealed opening, a tear-away opening, a filling opening, and a base structure.

[0041] Furthermore, the heat-sealing material includes any one or more combinations of low-density polyethylene, modified polypropylene, linear low-density polyethylene, polypropylene, and high-density polyethylene.

[0042] Furthermore, the filling opening material includes any one or more combinations of low-density polyethylene, modified polypropylene, linear low-density polyethylene, polypropylene, and high-density polyethylene.

[0043] Furthermore, the base structure material includes any one or more combinations of low-density polyethylene, modified polypropylene, linear low-density polyethylene, polypropylene, and high-density polyethylene.

[0044] Furthermore, the prepared extrusion packaging bag is as described in any of the above technical solutions.

[0045] In some embodiments, this invention provides a method for preparing a squeeze-type packaging bag for two-component epoxy adhesive. By designing a two-pack structure and separating the A and B components with a heat-sealed opening, the packaging bag can be directly squeezed for mixing when needed, offering convenient operation without the need for additional containers or stirring tools. The bag body is designed with a multi-layer composite structure, including an inner bag sheet layer, a heat-absorbing sheet layer, and an outer bag sheet layer, which absorbs the heat generated during epoxy adhesive mixing, maintains adhesive stability, and prevents localized overheating from affecting performance. Different shaped base structures, such as square, round, elliptical, or triangular base structures, are provided at the bottom of the packaging bag to improve stability, enhance structural strength, optimize storage and transportation, and adapt to different display environments. The use of a sealing strip inside the heat-sealed opening and the use of high-strength, corrosion-resistant, well-sealing, and heat-insulating materials ensures the epoxy adhesive's stable performance during storage and transportation, prevents leakage, and protects against external environmental influences.

[0046] This utility model provides a method for preparing extrusion packaging bags for two-component epoxy adhesives, which solves the problems of cumbersome mixing, risk of pollution and waste, inconvenience in supermarket display, and limited specifications in traditional two-component epoxy adhesive packaging. It has the advantages of convenient operation, cleanliness and hygiene, good display, and meeting different needs. It can effectively improve the ease of use and quality stability of two-component epoxy adhesives and meet the needs of users.

[0047] On another aspect, this utility model provides a multi-layer composite structure for preparing extrusion packaging bags with high sealing performance, heat absorption and stability. The multi-layer structure includes an inner bag sheet layer, a heat-absorbing sheet layer and an outer bag sheet layer, wherein the heat-absorbing sheet layer includes heat-absorbing sheets.

[0048] Furthermore, the material of the inner bag sheet includes any one or more combinations of low-density polyethylene, modified polypropylene, linear low-density polyethylene, polypropylene, and high-density polyethylene.

[0049] Furthermore, the material of the outer bag layer includes any one or more combinations of low-density polyethylene, modified polypropylene, linear low-density polyethylene, polypropylene, and high-density polyethylene.

[0050] Furthermore, the material of the heat-absorbing sheet includes any one or more combinations of silicone rubber, polyester rubber, HDPE plastic, polyurethane, and PA plastic.

[0051] The beneficial effects of this utility model are as follows: 1. This utility model provides a two-component epoxy adhesive extrusion packaging bag: First, the innovative two-pack structure, combined with an easy-tear opening and a filling opening, greatly improves operational convenience. Components A and B can be mixed within the bag without additional containers or tools. The easy-tear opening facilitates use, and the filling opening promotes efficient filling and provides labeling to improve production accuracy. Second, the first and second bag sheets utilize a multi-layer composite structure, including an inner bag sheet layer, a heat-absorbing sheet layer, and an outer bag sheet layer. The inner bag sheet layer is preferably modified polypropylene, which possesses good chemical stability, flexibility, and thermal transfer properties. It is unlikely to react chemically with the epoxy adhesive, ensuring that the epoxy adhesive is not contaminated during storage. Simultaneously, it can quickly transfer the heat generated during epoxy adhesive mixing to the heat-absorbing sheet layer. The heat-absorbing sheet in the heat-absorbing sheet layer is preferably polyester rubber, which has high thermal conductivity and good thermal stability. It can quickly absorb the heat generated during epoxy adhesive mixing, preventing localized overheating from adversely affecting the epoxy adhesive performance and maintaining the stability of the adhesive solution. During storage and transportation, the outer bag layer acts as a buffer and regulates temperature, preventing temperature changes from affecting the epoxy adhesive. The outer bag layer is preferably made of high-density polyethylene, which has high strength and hardness, providing excellent external protection against external forces; it also has good corrosion resistance, resisting external chemical corrosion and extending the service life of the packaging bag; its moderate heat insulation performance prevents excessive external heat from being transferred to the inside of the packaging bag, affecting the performance of the epoxy adhesive, while also ensuring it doesn't feel overheated when handled, improving the user experience.

[0052] Meanwhile, the width of the edge sealing area is strictly controlled. A heat-sealing process connects the edges of the first and second bag sheets together, ensuring a strong connection and a smooth appearance, providing excellent sealing performance and preventing epoxy adhesive leakage from the edges. The heat-sealing process divides the inner cavity of the packaging bag into two parts, each containing components A and B of the adhesive. The heat-sealing technology ensures a tight bond between the edges of the two bags under high temperature and pressure, preventing the two components from mixing when not in use. An internal sealing strip further enhances the sealing performance. The tear-off design is easy to tear, allowing users to easily open the packaging bag and remove the mixed epoxy adhesive, avoiding potential safety hazards from using knives or other tools. The filling opening size is rationally designed for efficient filling, and is marked or color-coded for quick identification of the filling positions of different components during production. After filling, the packaging bag is sealed using heat sealing or sealing strips to ensure no leakage of the epoxy adhesive during storage and transportation. The square base structure provides a larger contact area with the surface, increasing the stability of the packaging bag when standing. The square base facilitates processing and shaping, improving production efficiency and reducing production costs. It allows for closer arrangement and stacking during packaging and transportation, saving space. Simultaneously, it conforms to people's visual habits and aesthetic needs, enhancing product display and brand image, and making it convenient for consumers to place and retrieve.

[0053] Furthermore, it excels in production efficiency and cost-effectiveness. The preparation method is highly efficient and can be mass-produced; optimized material selection reduces costs while meeting performance requirements.

[0054] 2. The two-component epoxy extrusion packaging bag provided by this utility model exhibits significant advantages in terms of ease of operation, performance stability, packaging reliability, production efficiency, and cost-effectiveness. This innovative packaging design not only meets the demands of modern industrial production for efficient and reliable packaging but also provides users with a more convenient and safer user experience. With its unique design and excellent performance, the two-component epoxy extrusion packaging bag of this utility model can adapt to the needs of different industries and application scenarios, and has broad application prospects. Attached Figure Description

[0055] Figure 1 This is a three-dimensional structural diagram of the two-component epoxy extrusion packaging bag of this utility model (without two-component epoxy glue; color image).

[0056] Figure 2 This is a front view of the two-component epoxy extrusion packaging bag of this utility model (without the two-component epoxy glue filled; color image).

[0057] Figure 3 This is a side view (color image) of the two-component epoxy extrusion packaging bag of this utility model.

[0058] Figure 4 This is a front view of the two-component epoxy resin extrusion packaging bag of this utility model (the filling port is sealed after the two-component epoxy resin is poured in; color image).

[0059] Figure 5 This is a three-dimensional structural diagram of the two-component epoxy extrusion packaging bag of this utility model (without two-component epoxy glue; black and white line drawing).

[0060] Figure 6 This is a front view of the two-component epoxy extrusion packaging bag of this utility model (without two-component epoxy glue; black and white line drawing).

[0061] Figure 7 This is a side view (black and white line drawing) of the two-component epoxy extrusion packaging bag of this utility model.

[0062] Figure 8 This is a front view of the two-component epoxy resin extrusion packaging bag of this utility model (the filling port is sealed after the two-component epoxy resin is poured in; black and white line drawing). Detailed Implementation

[0063] The present invention will be further described in detail below with reference to the embodiments. It should be noted that the embodiments described below are intended to facilitate the understanding of the present invention and do not limit it in any way.

[0064] Unless otherwise specified, the experimental methods used in the following examples are conventional methods.

[0065] Unless otherwise specified, all materials and reagents used in the following examples are commercially available.

[0066] Example 1: This utility model provides a two-component epoxy resin extrusion packaging bag. I. Basic Structure of Two-Component Epoxy Adhesive Extrusion Packaging Bags This embodiment provides a compression packaging bag for two-component epoxy adhesives, primarily used for AB-component epoxy adhesives. It offers advantages such as convenient operation, hygiene, good display, and ability to meet diverse needs. Its specific structure is as follows: Figures 1-8 As shown.

[0067] from Figures 1-8 As can be seen from the description, the two-component epoxy extrusion packaging bag is a two-pack structure. The packaging bag includes a bag body and an inner cavity 4 formed by the two bags. The bag body includes a first bag piece 1 and a second bag piece 2. The edges of the first bag piece 1 and the second bag piece 2 are provided with a side sealing area 3. The first bag piece 1 and the second bag piece 2 are fixedly connected through the side sealing area 3 to form the inner cavity 4 of the packaging bag body. The length of the first bag piece 1 and the second bag piece 2 is 100-250mm and the width is 100-250mm. The width of the side sealing area 3 is 5-10mm.

[0068] Both the first bag sheet 1 and the second bag sheet 2 are composed of a multi-layer composite structure. The multi-layer structure includes an inner bag sheet layer 10, a heat-absorbing sheet layer 11, and an outer bag sheet layer 12. The material of the inner bag sheet layer 10 or the outer bag sheet layer 12 includes any one of low-density polyethylene, modified polypropylene, linear low-density polyethylene, polypropylene, and high-density polyethylene. In this embodiment, the inner bag sheet layer 10 is preferably modified polypropylene, and the outer bag sheet layer 12 is preferably high-density polyethylene.

[0069] Modified polypropylene exhibits excellent chemical stability. As an inner bag material, it is unlikely to react chemically with epoxy adhesive, ensuring the epoxy adhesive remains uncontaminated during storage. Simultaneously, modified polypropylene possesses a degree of flexibility, allowing it to withstand compression and deformation during use without rupture or leakage. Furthermore, modified polypropylene exhibits good heat transfer properties, rapidly transferring heat generated during epoxy adhesive mixing to the heat-absorbing sheet layer 11, improving the heat absorption efficiency of the heat-absorbing sheet and maintaining the stability of the adhesive solution.

[0070] High-density polyethylene (HDPE) possesses high strength and rigidity, providing excellent external protection for packaging bags as an outer layer material. This protects against damage from external forces during storage, transportation, and use. Furthermore, HDPE exhibits good corrosion resistance, resisting the erosion of chemicals in the external environment and extending the service life of the packaging bags. In addition, HDPE offers moderate thermal insulation, preventing excessive external heat transfer to the interior of the bag, which could affect the performance of the epoxy adhesive, while also preventing the bag from feeling excessively hot to the touch, thus improving the user experience.

[0071] First, both the first bag sheet 1 and the second bag sheet 2 are composed of an inner bag sheet layer 10 (made of modified polypropylene) and an outer bag sheet layer 12 (made of high-density polyethylene). Then, through processes such as heat sealing, the heat-sealed opening 5, tear-off opening 6, filling opening 7, and bottom support structure 8 are integrally formed on the composite structure. These structural parts are all part of the bag body. These parts also have a structure composed of any one or more combinations of low-density polyethylene, modified polypropylene, linear low-density polyethylene, polypropylene, and high-density polyethylene. The entire structure is composed of materials with high strength, corrosion resistance, good sealing performance, and good thermal insulation properties. Specifically, in this embodiment, it is a combination of modified polypropylene for the inner bag sheet layer 10 and high-density polyethylene for the outer bag sheet layer 12.

[0072] The thickness of the packaging bag is moderate, set at 0.1-0.2mm. Within this thickness range, the strength of the bag can be guaranteed without being too heavy, making it easy for users to squeeze. In this embodiment, the preferred thickness of the bag is 0.14mm, which has the best squeezing effect.

[0073] The heat-absorbing sheet layer 11 is provided with a heat-absorbing sheet 9, which is located between the inner bag sheet layer 10 and the outer bag sheet layer 12, and is tightly connected to the inner bag sheet layer 10. Its dimensions are 50-100mm in length and 20-50mm in width. The heat-absorbing sheet 9 is made of a material with high thermal conductivity and good thermal stability, such as silicone rubber, polyester rubber, HDPE plastic, polyurethane, PA plastic, etc. In this embodiment, polyester rubber is preferred. On the one hand, during the epoxy adhesive mixing process, a certain amount of heat is generated. The heat-absorbing sheet 9 can quickly absorb the heat conducted from the inner bag sheet layer 10, preventing excessively high local temperatures from adversely affecting the performance of the epoxy adhesive. Especially for some temperature-sensitive epoxy adhesive systems, the heat-absorbing sheet 9 can effectively maintain the stability of the adhesive solution, ensuring its reliable performance during use. On the other hand, during storage and transportation, changes in ambient temperature may also cause the epoxy adhesive temperature to rise. In conjunction with the outer bag sheet layer 12, the heat-absorbing sheet 9 can further buffer and regulate the temperature, avoiding the impact of temperature changes on the epoxy adhesive. Meanwhile, the heat-absorbing sheet 9 is in direct contact with the inner bag layer 10, enabling it to absorb heat evenly and preventing localized overheating or undercooling, thus further improving the quality stability of the epoxy adhesive. Furthermore, because the heat-absorbing sheet 9 is made of a specific polyester rubber material, it is tightly bonded to the main body of the packaging bag and will not detach or shift during use, ensuring the overall performance and reliability of the packaging bag.

[0074] The inner cavity 4 of the packaging bag is provided with a heat-sealing closure 5, which is used to divide the inner cavity 4 so that the bag body forms at least two independent inner cavities. In this embodiment, specifically, the inner cavity 4 of the packaging bag body is divided into two parts, which are bag bodies of the same volume to accommodate component A and component B adhesive, ensuring that component A and component B adhesive will not mix when not in use. Similarly, after the inner cavity 4 is divided, the volumes of the divided inner cavities can also be different, and the components they contain can be the same, depending on the actual situation. The width of the heat-sealing closure 5 is moderate, set at 1-10mm. Within this width range, it can ensure the firmness of the connection without affecting the appearance of the packaging bag. In this embodiment, the width of the heat-sealing closure 5 is preferably 3mm, which has the best sealing effect and is easy to break when squeezed. The heat-sealing closure 5 adopts advanced heat-sealing technology, so that the edges of the two independent inner cavities are tightly joined together under the action of high temperature and pressure. The surface of the heat-sealing closure 5 is flat and smooth, without any protrusions or depressions, ensuring that there is no leakage when the packaging bag is squeezed. To further improve the sealing performance of the hot-pressed seal 5, a sealing strip is also provided inside the hot-pressed seal 5. The sealing strip is made of a material that is resistant to high temperatures and corrosion and has good sealing performance. The material includes ethylene propylene diene monomer (EPDM) rubber, silicone rubber, neoprene rubber, and nitrile rubber (NBR). In this embodiment, silicone rubber is preferred, which can effectively prevent the A and B components from mixing when not in use.

[0075] The packaging bag has a tear-away opening 6 along its long edge, 5mm from the short edge, allowing users to easily open the bag and remove the mixed epoxy adhesive. The long edge of the bag refers to the two relatively longer sides in its naturally unfolded state before the two-component epoxy adhesive is filled. Typically, the long and short edges are perpendicular, with the long edge being longer than the short edge. The tear-away opening 6 is designed for easy tearing, allowing users to open the bag with a gentle pull, avoiding potential safety hazards from using knives or other tools.

[0076] The packaging bag has a filling opening 7 on its long side sealing area 3. The filling opening 7 is 50-150mm away from the long side of the packaging bag body. The dimensions of the filling opening 7 are 30-60mm long and 5-10mm wide, which meets the requirements of efficient filling without significantly affecting the overall structural strength and appearance of the packaging bag. After filling, the filling opening 7 is sealed by heat sealing or using sealing strips to ensure that the epoxy adhesive does not leak during storage and transportation, thus guaranteeing the quality and stability of the product. Additionally, the filling opening is marked or color-coded for quick identification of the filling positions of different components during production, improving production efficiency and accuracy.

[0077] The bottom of the packaging bag features a special structural design, enabling it to stand stably on a flat surface. Specifically, the bottom is designed as a base structure 8, which can be square, round, elliptical, or triangular. In this embodiment, it is square. Firstly, the square structure provides a larger contact area with the flat surface, increasing the stability of the packaging bag when standing. Compared to other shapes, the four right angles of a square can evenly distribute the weight of the packaging bag, making it less prone to tipping over and maintaining a stable standing position even under slight external impact. Secondly, the square base structure 8 is easier to process and shape during production. Its regular shape can be achieved with relatively simple molds and processes, improving production efficiency and reducing production costs. Simultaneously, during packaging and transportation, the square base allows for closer arrangement and stacking of the bags, saving space and improving storage and transportation efficiency. Furthermore, the square base structure conforms to people's visual habits and aesthetic needs. When displayed, the square packaging bags are arranged more neatly and attractively, attracting consumers' attention and enhancing the product's display effect and brand image. For consumers, the square base of the packaging bag makes it more convenient to place and retrieve during use, providing a better user experience.

[0078] Meanwhile, a reinforcing rib is provided around the bottom edge of the base structure 8 to enhance the stability of the packaging bag. The reinforcing rib is made of high-strength material and is tightly bonded to the main body material of the packaging bag to ensure that it will not deform or break when standing upright. This material includes any one of polypropylene, polyethylene, polyamide, polycarbonate, acrylonitrile-butadiene-styrene, polyester (PET), polyoxymethylene, and thermoplastic elastomers. Furthermore, heat-absorbing material, specifically heat-absorbing sheets 9, is provided on the inner surface of both the base structure 8 of component A and component B of the bag. These sheets have the same structure and function as the heat-absorbing sheets 9 in the heat-absorbing sheet layer 11.

[0079] II. Preparation method of two-component epoxy resin extrusion packaging bags The preparation method of this utility model of a two-component epoxy extrusion packaging bag specifically includes the following steps: 1. Material preparation: Modified polypropylene and high-density polyethylene are selected to make the bag body of the packaging bag, which specifically includes: first bag sheet 1, second bag sheet 2, side sealing area 3, heat-sealing 5, tear-off opening 6, filling opening 7, and bottom support structure 8, etc. At the same time, prepare sealing strip material: silicone rubber; high-strength material for reinforcing ribs: polyethylene; and high thermal conductivity and good thermal stability material for preparing heat-absorbing sheet 9: polyester rubber.

[0080] Strict quality inspections are conducted on the prepared materials to ensure they meet relevant standards. Pre-treatment of the materials, such as cleaning and drying, is performed to prepare them for subsequent processing.

[0081] 2. Bag sheet production: Produce the inner and outer bag sheet layers of the first bag sheet 1, and the inner and outer bag sheet layers of the second bag sheet 2.

[0082] Modified polypropylene is cut into inner bag sheet shapes using high-precision cutting equipment, with a length and width of 100-250mm, ensuring neat cut edges, no burrs or tears, and guaranteeing the dimensional accuracy of the inner bag sheet. Simultaneously, surface treatment is performed to enhance surface smoothness and cleanliness.

[0083] Using the same method, high-density polyethylene is cut into the shape of the outer bag sheet, with dimensions matching those of the inner bag sheet, and a length of 100-250mm and a width of 100-250mm.

[0084] According to the design dimensions, heat-absorbing sheets 9 are prepared using polyester rubber and cut to a length of 50-100 mm and a width of 20-50 mm. The heat-absorbing sheets 9 are placed between the inner bag sheet 10 and the outer bag sheet 12 to form the first bag sheet 1 of the composite structure. The second bag sheet 2 is then made using the same method.

[0085] 3. Side Sealing Area 3 Construction: Accurately align the edges of the first bag sheet 1 and the second bag sheet 2, and use heat sealing equipment to heat seal the edges, forming the side sealing area 3 and the inner cavity 4 of the packaging bag. Strictly control the width of the side sealing area 3 to 5-10mm to ensure a firm connection and a smooth appearance. Conduct a thorough inspection of the side sealing area 3, using a combination of visual inspection and instrument testing to ensure there are no issues such as incomplete or incomplete sealing, guaranteeing the airtightness of the packaging bag.

[0086] 4. Heat-sealing process: Precisely position the first bag sheet 1 and the second bag sheet 2 according to design requirements. Preheat the area where the heat-sealing seal 5 is to be installed to improve the heat-sealing effect. Using a heat-sealing device, under suitable high temperature (140~200℃) and pressure (80~130MPa), tightly join the two bag sheets together at the center to form the heat-sealing seal 5, which divides the inner cavity 4 in two. Strictly control the width of the heat-sealing seal 5 to 1-10mm to ensure a firm connection and a smooth, flat surface without protrusions or depressions. A sealing strip is pasted inside the heat-sealing seal 5, ensuring a tight seal between the strip and the bag sheet to further improve the sealing performance.

[0087] 5. Filling Opening 7 Production: Accurately determine the position of the filling opening 7 on the long side seal area 3 of the packaging bag, at a distance of 20-150mm from the long side of the packaging bag. Use professional cutting equipment to produce the filling opening 7, strictly controlling the dimensions to be 30-60mm in length and 5-10mm in width. Set clear markings or color distinctions at the filling opening 7 to quickly identify the filling positions of different components during production. Marking can be done using printing, affixing labels, or other methods.

[0088] 6. Base support structure 8 manufacturing: The base support structure 8 is integrally molded with the bag body and is part of the bag body. The base support structure 8 is designed as a square to ensure that the size and shape of the base support perfectly match the bottom of the packaging bag. Reinforcing ribs are set at the bottom edge of the base support structure 8 to make the base support and the main body of the packaging bag tightly connected, ensuring that it will not deform or break when standing.

[0089] 7. Inspection: Conduct a comprehensive inspection of the completed packaging bags, including appearance inspection (inspection standard: GB / T15171-1994), sealing test (inspection standard: GB / T 15171-1994), strength test (inspection standard: GB / T15171-1994), and heat absorption performance test (inspection standard: GB / T 14837.1-2014), etc. Visual inspection should ensure that the packaging bag is free of scratches, stains, deformation, defects, tears, and other defects; the sealing test can be performed using air pressure or water immersion methods to check the sealing performance of the packaging bag at the heat-sealing and filling openings, etc. After inflation, the seal should not leak air, and after filling with water, the side seal area should not leak water; the strength test can be performed by stretching, extrusion, etc., to check whether the overall strength of the packaging bag meets the design requirements, such as the outer side seal area should not break after extrusion of glue; the heat absorption performance test can simulate the temperature changes during epoxy glue mixing, storage, and transportation to test the heat absorption effect and temperature regulation capability of the heat absorption sheet 9, such as the surface temperature of the extruded film should be low and not hot to the touch when extruding and extruding mixed epoxy glue.

[0090] 8. Packaging and Storage: The inspected and qualified bags shall be packaged using appropriate packaging materials, such as plastic bags and cartons, to protect and package them, ensuring that the bags are not damaged during storage and transportation. The packaged bags shall be stored in a dry, well-ventilated environment free of corrosive gases, avoiding direct sunlight and high temperature and humidity environments to ensure that the quality and performance of the bags are not affected during storage.

[0091] III. The Role of Different Structures in Two-Component Epoxy Extrusion Packaging Bags 1. Two-Pack Structure: The two-pack structure houses the A and B components of the epoxy adhesive separately in two connected bags, ensuring that the two components do not mix when not in use, thus maintaining the performance stability of the epoxy adhesive. During use, the user can easily mix components A and B by simply squeezing, making the operation convenient and eliminating the need for additional containers and tools, greatly simplifying the usage process. Furthermore, this structural design facilitates the filling operation during the production process, allowing for accurate separate filling of components A and B, improving production efficiency and accuracy.

[0092] 2. First bag sheet 1 and second bag sheet 2: First bag sheet 1 and second bag sheet 2 constitute the main structure of the packaging bag body, both of which are composed of a multi-layer structure (inner bag sheet layer 10, heat-absorbing sheet layer 11, and outer bag sheet layer 12).

[0093] The inner bag layer 10 is preferably made of modified polypropylene, which has good chemical stability and is not prone to chemical reaction when in contact with epoxy adhesive, ensuring that the epoxy adhesive is not contaminated during storage. At the same time, modified polypropylene has a certain degree of flexibility, allowing it to withstand the compression and deformation of the packaging bag during use without cracking or leakage. Furthermore, modified polypropylene also has good heat transfer properties, enabling it to quickly transfer the heat generated during epoxy adhesive mixing to the heat-absorbing sheet layer 11.

[0094] A heat-absorbing sheet layer 11 is positioned in the middle, and its internal heat-absorbing sheet 9 is made of a material with high thermal conductivity and good thermal stability, preferably polyester rubber. The heat-absorbing sheet 9 can quickly absorb the heat generated during the epoxy adhesive mixing process, conducted from the inner bag sheet layer 10, preventing localized overheating from adversely affecting the performance of the epoxy adhesive. Especially for some temperature-sensitive epoxy adhesive systems, the heat-absorbing sheet 9 can effectively maintain the stability of the adhesive solution, ensuring reliable performance during use. Furthermore, during storage and transportation, changes in ambient temperature may cause the epoxy adhesive temperature to rise; the heat-absorbing sheet 9, in conjunction with the outer bag sheet layer 12, further buffers and regulates the temperature, preventing the impact of temperature changes on the epoxy adhesive. The uniform heat absorption characteristic avoids localized overheating or overcooling, improving the quality stability of the epoxy adhesive.

[0095] The outer bag layer 12 is preferably made of high-density polyethylene (HDPE), which has high strength and hardness, providing excellent external protection for the packaging bag and preventing damage from external forces during storage, transportation, and use. At the same time, HDPE has good corrosion resistance, resisting the erosion of chemicals in the external environment and extending the service life of the packaging bag. Furthermore, HDPE has moderate thermal insulation properties, preventing excessive external heat from being transferred to the inside of the packaging bag, thus affecting the performance of the epoxy adhesive, while also preventing the packaging bag from feeling overheated when held, improving the user experience.

[0096] The multi-layer structure, through the synergistic cooperation of each layer, effectively protects the internal epoxy adhesive from the influence of the external environment. The inner pouch layer 10 ensures the purity of the epoxy adhesive and transfers heat, the heat-absorbing sheet layer 11 effectively regulates the temperature and maintains the stability of the adhesive, and the outer pouch layer 12 provides external protection and moderate heat insulation, together providing a safe and stable storage and use environment for the epoxy adhesive.

[0097] Meanwhile, the specific length (100-250mm) and width (100-250mm) design of the first bag sheet 1 and the second bag sheet 2 not only meets the requirement of accommodating a certain amount of epoxy adhesive but also facilitates user handling. Furthermore, the precisely cut and surface-treated bag sheets ensure dimensional accuracy and surface quality, providing a solid foundation for subsequent processing and use.

[0098] 3. Side Sealing Area 3: Side sealing area 3 connects the edges of the first bag sheet 1 and the second bag sheet 2 together through a heat sealing process, forming the inner cavity 4 of the packaging bag body. The width of side sealing area 3 is strictly controlled to be 5-10mm to ensure the firmness of the connection and the flatness of the appearance. At the same time, the good sealing performance of side sealing area 3 prevents epoxy adhesive from leaking from the edges, ensuring the quality and stability of the product during storage and transportation.

[0099] 4. Heat-sealing 5: The heat-sealing 5 divides the inner cavity 4 of the packaging bag body into two, each containing components A and B of the adhesive. The heat-sealing technology ensures that the edges of the two bag bodies are tightly sealed under high temperature and pressure, preventing the two components from mixing when not in use. The surface of the heat-sealing 5 is smooth and flat, without protrusions or depressions, preventing leakage when the packaging bag is squeezed. An internal sealing strip further enhances the seal, effectively preventing the mixing of components A and B.

[0100] 5. Tear-away opening 6: The tear-away opening 6 is located on the long edge of the packaging bag, making it convenient for users to open the bag and remove the mixed epoxy adhesive. The easy-tear design allows users to open the bag with just a gentle pull, avoiding the safety hazards that may arise from using knives or other tools. The specific location of the tear-away opening 6 is designed to facilitate user operation without affecting the overall structure and seal of the packaging bag.

[0101] 6. Filling Opening 7: The filling opening 7 is located in the long side seal area 3 of the packaging bag. Its specific size design meets the requirements of efficient filling without excessively affecting the overall structural strength and appearance of the packaging bag. Furthermore, the markings or color differentiation at the filling opening 7 facilitate quick identification of the filling positions of different components during production, improving production efficiency and accuracy. After filling, the filling opening 7 is sealed by heat sealing or the use of sealing strips to ensure that the epoxy adhesive does not leak during storage and transportation.

[0102] 7. Base Structure 8: The base structure 8 is designed in a square shape, providing a larger contact area and better contact with the flat surface, increasing the stability of the packaging bag when standing. The four right angles of the square shape can evenly distribute the weight of the packaging bag, making it less likely to tip over when placed, and maintaining a stable standing position even under slight external impact. The regular square base structure 8 is easy to process and shape during the production process, and can be achieved with relatively simple molds and processes, improving production efficiency and reducing production costs. During packaging and transportation, the packaging bags with square bases can be arranged and stacked more closely, saving space and improving storage and transportation efficiency. At the same time, the base structure 8 also conforms to people's visual habits and aesthetic needs. When displayed, the square packaging bags are arranged more neatly and attractively, which can attract consumers' attention and enhance the product display effect and brand image. For consumers, the packaging bags with square bases are also more convenient to place and use. In addition, the base structure 8 is also equipped with heat-absorbing sheets 9, which have the same function as the heat-absorbing sheets 9 in the heat-absorbing sheet layer 11, and their size is adapted to the base structure 8.

[0103] This utility model provides a compression packaging bag for two-component epoxy adhesive. Through innovative design and structure, it solves the problems of cumbersome mixing, pollution and waste risks, inconvenient supermarket display, and limited specifications associated with traditional two-component epoxy adhesive packaging. It offers advantages such as convenient operation, hygiene, good display, and ability to meet diverse needs, effectively improving the ease of use and quality stability of two-component epoxy adhesives and satisfying user requirements.

[0104] Example 2: Structural and material optimization of a two-component epoxy resin extrusion packaging bag I. Improvement of the Two-Package Structure Traditional two-component epoxy adhesives are typically packaged in two separate containers. Components A and B must be removed separately and poured into a single container for manual mixing. This traditional packaging method has several significant drawbacks. First, the operation is extremely cumbersome, requiring not only an additional container but also mixing tools. This undoubtedly increases the complexity of use, making the entire process lengthy and laborious, significantly increasing time costs. For manufacturers, this means consuming more manpower and time resources during production, reducing efficiency. For users, the series of complex operations required in actual use causes inconvenience, increases the difficulty and time investment, and the mixing process in an external container is highly susceptible to contamination.

[0105] Therefore, in this embodiment, the inventors designed a two-component epoxy resin extrusion packaging bag with a two-pack structure. The two-pack structure houses components A and B of the epoxy resin separately in two connected bag bodies. In actual use, the user only needs to squeeze the packaging bag to quickly mix components A and B, eliminating the need for additional containers or stirring tools, greatly simplifying the operation and saving time. Simultaneously, this structural design facilitates filling operations during production. Components A and B can be accurately filled separately, ensuring accuracy and efficiency, thereby improving production efficiency and product quality stability. Furthermore, the simplified operation not only improves ease of use but also reduces the risk of product quality problems due to improper operation. At the same time, the two-pack structure also makes product storage and transportation more convenient, reducing the risk of collision and leakage that may arise from two independent containers.

[0106] II. Improvement of heat absorber structure and selection of materials In traditional epoxy adhesive packaging methods, the mixing process often generates heat, which can easily accumulate locally due to a lack of effective heat absorption measures. When components A and B are mixed, if the heat released by the chemical reaction is not dealt with promptly, it can lead to a rapid increase in local temperature. This excessively high local temperature can severely negatively impact the performance and quality of the epoxy adhesive. On one hand, high temperatures may accelerate the chemical reaction of the epoxy adhesive, causing it to cure prematurely before reaching its intended application location, affecting the operability and effectiveness of the application. On the other hand, high temperatures may also alter the molecular structure of the epoxy adhesive, reducing its key performance indicators such as bond strength and corrosion resistance, thereby significantly affecting the overall quality and service life of the product.

[0107] To address the aforementioned issues, in this embodiment, the heat-absorbing sheet is first placed directly inside the packaging bag, coming into direct contact with the A and B component colloids. However, on one hand, due to potential incompatibility between some heat-absorbing sheet materials and epoxy adhesive, contact can cause changes in the epoxy adhesive's properties, such as discoloration or deterioration, severely affecting the quality stability of the epoxy adhesive. On the other hand, direct contact may cause the heat-absorbing sheet to easily shift or detach during epoxy adhesive mixing, storage, and transportation, preventing it from continuously and effectively absorbing heat and thus affecting the overall performance reliability of the packaging bag. Furthermore, direct contact increases the difficulty of cleaning and maintaining the heat-absorbing sheet, which is detrimental to quality control and cost management during the production process.

[0108] Therefore, in the subsequent structural design, the inventors designed both the first and second bag sheets of the two-component epoxy adhesive extrusion packaging bag as multi-layer composite structures, including an inner bag sheet layer, a heat-absorbing sheet layer, and an outer bag sheet layer. In the heat-absorbing sheet layer, the portion tightly connected to the inner bag sheet features a heat-absorbing sheet structure. This heat-absorbing sheet is typically made of a material with high thermal conductivity and good thermal stability. The heat-absorbing sheet can quickly absorb the heat generated during epoxy adhesive mixing, effectively solving the problem of excessively high local temperatures adversely affecting epoxy adhesive performance. The presence of the heat-absorbing sheet plays a crucial role in maintaining the stability of the adhesive solution, ensuring reliable performance of the epoxy adhesive during use. Specifically, it can absorb heat in a timely manner, keeping the epoxy adhesive within a suitable temperature range after mixing, ensuring that the chemical reaction proceeds under the expected conditions, thereby guaranteeing the product's curing effect and performance indicators. Simultaneously, the heat-absorbing sheet can also prevent epoxy adhesive deterioration and aging caused by excessively high temperatures, extending the product's service life.

[0109] Furthermore, changes in ambient temperature during storage and transportation can cause the epoxy adhesive temperature to rise. The heat-absorbing sheet, working in conjunction with the insulation material of the packaging bag, further buffers and regulates the temperature, preventing the impact of temperature fluctuations on the epoxy adhesive. The heat-absorbing sheet is in direct contact with the inner bag layer, quickly and evenly absorbing the heat generated after the A and B components of the adhesive are mixed, preventing localized overheating or undercooling and further improving the quality stability of the epoxy adhesive. Because the heat-absorbing sheet is made of specific materials, it is tightly bonded to the inner bag layer and will not detach or shift during use, ensuring the overall performance and reliability of the packaging bag.

[0110] Because heat absorbers made of different materials exhibit varying performance characteristics, this embodiment further screened the materials used to ensure optimal performance. Specifically, the materials included were: silicone rubber, polyester rubber, HDPE plastic, polyurethane (PU), and PA plastic. To determine the optimal heat absorber material, comprehensive tests were conducted on heat absorbers made from different materials. Details are shown in Table 1. Table 1. Performance comparison of heat absorbers made of different materials

[0111] Note: (1) Thermal conductivity reflects the thermal conductivity of a material. The higher the value, the faster the heat conduction. The transient plane heat source method is used for testing. The material to be tested is made into a thin sheet of a specific size. A professional thermal conductivity tester is used to measure the material’s response to transient heat flow under certain temperature (25℃) and pressure conditions (0.1MPa) to calculate the thermal conductivity. The test standard is to compare it with a standard material (polyester rubber) with known good thermal conductivity. If the error is within a certain range (±5%), it is considered qualified. (2) Thermal stability indicates the stability of the material’s properties within a certain temperature range. Thermogravimetric analysis is used for testing. The material is placed under a specific temperature program, and its mass changes with temperature is measured. The test standard is that within a certain temperature range (e.g., -20℃ to 80℃), the mass loss of the material does not exceed a certain proportion (e.g., 5%), and the changes in the material’s physical properties (e.g., hardness, size, etc.) are within an acceptable range. (3) Compatibility with epoxy resin reflects the changes in the material after contact with epoxy resin. The immersion test method is used for testing. The material is immersed in epoxy resin and observed under certain temperature and time conditions (e.g., immersion at room temperature for 30 days). The changes in appearance (e.g., color, surface roughness, etc.), physical properties (e.g., hardness, elasticity, etc.), and chemical properties (e.g., whether a chemical reaction occurs, etc.) are observed. The inspection standard is that after the material comes into contact with epoxy resin, there is no obvious change in appearance, the change in physical properties does not exceed a certain range (e.g., the change in hardness does not exceed 10%), and the chemical properties are stable. (4) The bonding strength indicates the degree of firmness of the heat-absorbing sheet to the bottom support structure and the main body of the packaging bag. The tensile test method is used for inspection. The bonding part of the heat-absorbing sheet to the bottom support structure and the main body of the packaging bag is made into a specific sample, and a universal testing machine is used to perform a tensile test to measure the tensile force when it breaks. The inspection standard is that the bonding strength is not lower than a certain value (e.g., 3N / mm). 2 Furthermore, it will not detach or shift during actual use.

[0112] As shown in Table 1, only when polyester rubber is preferred does the heat-absorbing sheet achieve optimal overall performance in terms of thermal conductivity, thermal stability, compatibility with epoxy resin, and bonding strength. High thermal conductivity allows for rapid absorption of heat generated during the mixing of the AB component epoxy resin, preventing localized overheating. Good thermal stability ensures stable performance within a certain temperature range, guaranteeing effective operation under various environments. Excellent compatibility with epoxy resin prevents adverse effects on epoxy resin performance after long-term contact, while also maintaining its own properties without significant changes. High bonding strength ensures a firm bond with the base structure and the main body of the packaging bag, preventing detachment or displacement during use and guaranteeing the overall performance and reliability of the packaging bag. Therefore, in this embodiment, polyester rubber is preferred for preparing the heat-absorbing sheet.

[0113] III. Optimization and Selection of Packaging Bag Materials The improved two-component packaging structure of this invention allows for the mixing of epoxy adhesives components A and B inside the packaging bag. However, the mixing of components A and B generates heat, placing higher demands on the sealing, strength, and insulation performance of the packaging material. Traditional two-component epoxy adhesive packaging cannot meet the requirements of mixing components A and B within the same package while ensuring a safe and stable mixing process, preventing leakage, and maintaining a suitable temperature. When using traditional two-component epoxy adhesive packaging materials, localized overheating may occur due to the ineffective dissipation of heat generated during mixing, affecting the epoxy adhesive's performance; or leakage may easily occur during mixing due to insufficient sealing of the packaging material, resulting in product waste and environmental pollution; furthermore, the strength of traditional packaging materials may not be able to withstand the internal pressure changes during mixing, easily leading to breakage.

[0114] Therefore, the inventors designed the packaging bag as a multi-layered composite structure, including an inner bag sheet layer, a heat-absorbing sheet layer, and an outer bag sheet layer. The inner bag sheet layer is in direct contact with the epoxy resin, protecting it from contamination and possessing excellent heat transfer properties, rapidly conducting the heat generated during epoxy resin mixing to the heat-absorbing sheet layer. The heat-absorbing sheet layer is equipped with heat-absorbing sheets to quickly absorb the heat generated during epoxy resin mixing, preventing localized overheating from adversely affecting the epoxy resin's performance. During storage and transportation, it also works with the outer bag sheet layer to buffer and regulate temperature. The outer bag sheet layer provides external protection for the packaging bag, possessing high strength and hardness to resist external damage, good corrosion resistance to resist external chemical corrosion, and moderate heat insulation properties to prevent excessive external heat from transferring into the packaging bag and affecting the epoxy resin's performance. It also avoids excessive heat when held, improving the user experience. The multi-layer composite structure solves the problems of traditional two-component epoxy packaging, such as localized overheating, insufficient sealing, low strength, and easy breakage. It ensures the stability of epoxy performance, prevents leakage and waste, and improves the overall reliability of packaging bags.

[0115] Meanwhile, in order to further meet or improve the overall performance of the packaging bag of this utility model, after improving the heat-absorbing sheet material, the materials of the inner bag layer and the outer bag layer were also screened accordingly. The specific results are shown below: 1. Improvement and selection of inner bag sheet materials In this invention, the inner bag layer directly contacts the epoxy resin and conducts heat. It needs to meet requirements such as good compatibility with the epoxy resin, sufficient flexibility to accommodate the compression deformation of the packaging bag, and good heat transfer performance while avoiding excessive heat conduction. Therefore, the following materials were screened: low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), high-density polyethylene (HDPE), polypropylene (PP), and modified polypropylene (RCPP). To determine the optimal packaging material, comprehensive tests were conducted on packaging bags made from different materials. Details are shown in Table 2. Table 2. Performance Comparison of Two-Component Epoxy Extrusion Packaging Bags Made with Different Inner Layer Bag Materials

[0116] Note: In Table 2, the tensile strength is tested according to GB / T 1040-1992 standard, the corrosion resistance is tested according to GB / T11547-2008 standard, the sealing performance is tested according to GB / T 15171-1994 standard, and the thermal insulation performance is tested according to GB / T13475-2008 standard; the simulated environment specifically refers to a constant temperature environment at 25℃, simulating the conditions under hot climate or when stored in a high-temperature place.

[0117] As shown in Table 2, modified polypropylene exhibits the best overall performance in terms of tensile strength, corrosion resistance (compatibility with epoxy adhesives), sealing performance, and thermal insulation performance. The higher tensile strength of modified polypropylene allows it to better withstand external forces, making it less prone to breakage or damage during storage, transportation, and use. Regarding corrosion resistance, there is no significant change after 60 days of contact with epoxy adhesives, and the strength loss is only 1.5%, indicating excellent compatibility and corrosion resistance with epoxy adhesives, enabling it to maintain the integrity and stability of packaging over a long period. In terms of sealing performance, the leakage rate is only 0.08%, effectively preventing epoxy adhesive leakage and ensuring product quality. Regarding thermal insulation performance, the temperature change does not exceed 2°C per hour under simulated conditions. This ensures sufficient heat transfer performance to meet the heat generated during rapid epoxy adhesive mixing while preventing excessive heat conduction, ensuring the epoxy adhesive remains within a suitable temperature range and avoiding adverse effects of temperature changes on its performance.

[0118] Meanwhile, this embodiment found that since the inner bag sheet needs to be in direct contact with the heat-absorbing sheet, heat transfer needs to be expedited. However, it is also necessary to avoid excessively rapid heat transfer leading to drastic local temperature changes that could affect the epoxy resin performance. Only when the inner bag sheet material is preferably modified polypropylene, combined with the heat-absorbing sheet material (polyester rubber), can the optimal heat transfer and temperature regulation effect be achieved. When other materials are used for the inner bag sheet, the effect is less noticeable, possibly because these other materials have shortcomings in terms of compatibility with the heat-absorbing sheet, heat transfer performance, and chemical stability. For example, low-density polyethylene has relatively low tensile strength and may not be able to withstand certain external forces; linear low-density polyethylene exhibits slight bubbling after contact with epoxy resin for a period of time, indicating that its compatibility with epoxy resin needs improvement; while polypropylene and high-density polyethylene show some performance in terms of corrosion resistance and thermal insulation, they still lag behind modified polypropylene.

[0119] Therefore, in order to achieve the best performance of two-component epoxy extrusion packaging bags, the inner bag sheet material should preferably be modified polypropylene, and combined with a specific heat-absorbing sheet material (polyester rubber) to achieve good heat transfer and temperature regulation effects, and ensure the stability of epoxy performance.

[0120] 2. Improvement and selection of outer bag sheet materials In this invention, the outer bag layer provides external protection for the packaging bag, resisting the influence of the external environment. It needs to meet requirements such as high strength and hardness to resist external damage, good resistance to external environmental corrosion, good thermal insulation to prevent excessive heat transfer from affecting the epoxy adhesive performance, and not feeling overheated when handled. Therefore, the following materials were screened: low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), high-density polyethylene (HDPE), polypropylene (PP), and modified polypropylene (RCPP). To determine the optimal packaging material, comprehensive tests were conducted on packaging bags made from different materials. Details are shown in Table 3. Table 3. Performance Comparison of Two-Component Epoxy Extrusion Packaging Bags Made with Different Outer Bag Sheet Materials

[0121] Note: In Table 3, the tensile strength is tested according to GB / T 1040-1992 standard, the resistance to external environmental corrosion is tested according to GB / T 11547-2008 standard, the sealing performance is tested according to GB / T 15171-1994 standard, and the thermal insulation performance is tested according to GB / T 13475-2008 standard; the external simulated environment specifically refers to a constant temperature environment at 25℃, simulating the conditions under hot climate or when stored in a high-temperature place.

[0122] Table 3 shows that high-density polyethylene (HDPE) exhibits the best overall performance in terms of tensile strength, corrosion resistance, sealing performance, and thermal insulation. Although modified polypropylene (PP) performs well in tensile strength and sealing performance, HDPE has a significant advantage in thermal insulation. Under simulated external conditions, the two-component epoxy extrusion packaging bags made of HDPE show less external temperature change, indicating superior thermal insulation performance. This allows the packaging bags to better block external heat transfer to the interior when facing external temperature changes, providing a relatively stable temperature environment for the epoxy adhesive and preventing the performance and quality of the epoxy adhesive from being affected by external temperature fluctuations. Simultaneously, the excellent thermal insulation performance also prevents the packaging bags from feeling overheated when held, improving the user experience.

[0123] Therefore, considering all factors, high-density polyethylene is preferred as the outer bag layer material in this embodiment. It has excellent resistance to external forces, resistance to corrosion from the external environment, good sealing performance, outstanding heat insulation performance, and the best external protection and temperature control performance.

[0124] In the description of this utility model, it should be understood that the terms "center", "horizontal", "up", "down", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0125] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A two-component epoxy resin extrusion packaging bag, characterized in that, The bag includes a bag body and an inner cavity formed therefrom, the bag body including a heat-sealed opening for separating the inner cavity so that the bag body forms at least two independent inner cavities; the bag body is provided with heat-absorbing sheets for absorbing heat.

2. The two-component epoxy resin extrusion packaging bag as described in claim 1, characterized in that, The bag body includes a first bag piece and a second bag piece, the edges of the first bag piece and the second bag piece are provided with a side sealing area, and the first bag piece and the second bag piece are connected through the side sealing area to form the inner cavity.

3. The two-component epoxy resin extrusion packaging bag as described in claim 2, characterized in that, The first bag sheet is composed of a multi-layer composite structure; the multi-layer structure includes an inner bag sheet layer, a heat-absorbing sheet layer and an outer bag sheet layer, the heat-absorbing sheet layer is located between the inner bag sheet layer and the outer bag sheet layer, and the heat-absorbing sheet layer includes the heat-absorbing sheet.

4. The two-component epoxy resin extrusion packaging bag as described in claim 2, characterized in that, The hot-press seal extends to the edge sealing area.

5. The two-component epoxy resin extrusion packaging bag as described in claim 4, characterized in that, The heat-sealed opening includes a sealing strip inside.

6. The two-component epoxy extrusion packaging bag as described in claim 1, characterized in that, The bag body includes a base structure, and the inner surface of the base structure includes heat-absorbing sheets.

7. The two-component epoxy resin extrusion packaging bag as described in claim 6, characterized in that, The base structure includes a square base structure, a round base structure, an elliptical base structure, or a triangular base structure.

8. The two-component epoxy extrusion packaging bag as described in claim 6, characterized in that, The base structure includes reinforcing ribs.

9. The two-component epoxy resin extrusion packaging bag as described in claim 1, characterized in that, The squeeze-type packaging bag also includes a tear-off opening and a filling opening; the tear-off opening is located at the long edge of the bag body.

10. The two-component epoxy extrusion packaging bag as described in claim 9, characterized in that, The filling opening is located in the long side seal area of ​​the packaging bag; the filling opening is marked.

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