Packaging bag made of plastic film

Abstract

The utility model relates to the technical field of packaging bags, and discloses a packaging bag made of a plastic film, the packaging bag comprises a first plastic film body, a first heat sealing layer and a second plastic film body, and the first plastic film body is subjected to heat sealing treatment through the first heat sealing layer and forms the packaging bag. According to the packaging bag made of the plastic films, a plurality of layers are compounded to form the first plastic film body and the second plastic film body by adopting a co-extrusion process, so that the thickness uniformity and the strength consistency of the first plastic film body and the second plastic film body can be improved; the first heat sealing layer, the second heat sealing layer and the third heat sealing layer are adopted to perform heat sealing treatment on the first plastic film body and the second plastic film body, so that the situation that the first plastic film body and the second plastic film body are deformed or the strength is reduced at a high temperature is avoided; the environment-friendly performance of the first plastic film body material is improved by arranging the film layer, the nano filler, the inner barrier layer, the functional layer and the outer barrier layer.

Description

Technical Field

[0001] This application relates to the field of packaging bag technology, specifically to a packaging bag made of plastic film. Background Technology

[0002] Plastic film packaging bags are currently one of the most important packaging forms widely used in the food, daily necessities, and pharmaceutical industries. With increasing environmental protection requirements and growing consumer demands for packaging performance, plastic film packaging bags are constantly being optimized in terms of material selection, processing technology, and functional design.

[0003] Currently, the most common plastic film packaging bags on the market are made of materials such as polyethylene (PE) and polypropylene (PP), which have advantages such as being lightweight, waterproof, and moisture-proof. However, with increasingly stringent environmental regulations and consumers' higher requirements for packaging performance, traditional plastic film packaging bags are facing new challenges in terms of environmental protection, durability, and functionality.

[0004] Traditional plastic film packaging bags are prone to uneven film thickness, resulting in inconsistent bag strength. At the same time, the heat sealing process used can easily cause film deformation or reduced strength at high temperatures. In order to solve the above problems, a new type of plastic film packaging bag is proposed. Utility Model Content

[0005] To address the shortcomings of existing technologies, this application provides a plastic film packaging bag that improves the thickness uniformity and strength consistency of the plastic film packaging bag, optimizes the heat sealing process, and avoids film deformation or strength reduction at high temperatures.

[0006] To achieve the above objectives, this application provides the following technical solution: a plastic film packaging bag, comprising a first plastic film body, a first heat-sealing layer, and a second plastic film body. The first plastic film body is heat-sealed by the first heat-sealing layer to form a packaging bag. The first plastic film body includes a film layer and nanofillers filled inside the film layer. The film layer is made of a mixture of polyethylene and polylactic acid. The nanofillers are preferably nano-silica. An inner barrier layer is laminated to the inner surface of the film layer through a co-extrusion process. A functional layer is coated to the inner surface of the inner barrier layer. An outer barrier layer is laminated to the outer surface of the film layer through a co-extrusion process.

[0007] The above scheme, by using a co-extrusion process to composite multiple layers to form a first plastic film body and a second plastic film body, improves the thickness uniformity and strength consistency of the first and second plastic film bodies. Furthermore, the use of a first, second, and third heat-sealing layer to heat-seal the first and second plastic film bodies prevents deformation or strength reduction at high temperatures. The inclusion of film layers, nanofillers, an inner barrier layer, a functional layer, and an outer barrier layer improves the environmental performance and degradation properties of the first plastic film body material. The synergistic effect of the inner barrier layer, functional layer, and outer barrier layer enhances the functional design of the packaging bag, making it more practical.

[0008] Furthermore, the inner barrier layer is made of polyadipate, and the functional layer is coated on the inner surface of the inner barrier layer by a spraying process using nano-silver antibacterial agent.

[0009] The above scheme limits the material of the inner barrier layer, giving it strong barrier properties and ease of use. It also limits the material of the functional layer, which improves the antibacterial effect of the first plastic film, thus facilitating the storage of materials.

[0010] Furthermore, the outer surface of the outer barrier layer is provided with a wear-resistant layer, which is made of polyhydroxyalkanoate.

[0011] The above solution can improve the wear resistance of the outer surface of the first plastic film body, and the polyhydroxyalkanoate has a biodegradable effect, making it suitable for use as an outer layer material.

[0012] Furthermore, the outer surface of the wear-resistant layer is provided with a printing layer, which is made of environmentally friendly ink.

[0013] The above solution allows for easy printing of patterns, text, or QR codes on the surface of the first plastic film, thereby enhancing the visual appeal and information delivery function of the packaging bag.

[0014] Furthermore, a second heat-sealing layer is provided between the first plastic film body and the second plastic film body, and the first plastic film body and the second plastic film body are heat-sealed together by the second heat-sealing layer. A third heat-sealing layer is provided both inside and outside the second plastic film body, and the second plastic film body is heat-sealed by the third heat-sealing layer to form the top of the packaging bag.

[0015] The above solution enables the first and second plastic film bodies to form a sealed packaging bag, facilitating the storage of materials.

[0016] Furthermore, a through hole is provided at the top of the third heat-sealing layer.

[0017] The above solution allows the packaging bag to be easily hung in a suitable position through the opening, thus optimizing the actual use effect of the packaging bag.

[0018] Furthermore, a sliding lock strip is installed inside the second plastic film body, and a sliding lock block is installed on the outer surface of the sliding lock strip.

[0019] With the above solution, the sliding lock strip and sliding lock block can conveniently place materials into the packaging bag formed by the first plastic film body and the second plastic film body, and also facilitate the removal of materials from the first plastic film body and the second plastic film body.

[0020] Furthermore, the internal structure of the second plastic film body is consistent with the internal structure of the first plastic film body, and the first heat-sealing layer, the second heat-sealing layer and the third heat-sealing layer are all made of low-melting-point polyethylene material.

[0021] The above scheme defines the internal structural materials of the first and second plastic film bodies, enabling the second plastic film body to maintain the same characteristics as the first plastic film body for ease of use. It also defines the materials of the first, second, and third heat-sealing layers, which optimizes the heat-sealing process and prevents deformation or strength reduction of the first and second plastic film bodies at high temperatures.

[0022] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0023] This new type of plastic film packaging bag uses a co-extrusion process to composite multiple layers to form a first plastic film body and a second plastic film body. This improves the thickness uniformity and strength consistency of the first and second plastic film bodies. Furthermore, a first, second, and third heat-sealing layer are used to heat-seal the first and second plastic film bodies, preventing deformation or strength reduction at high temperatures. The inclusion of film layers, nanofillers, an inner barrier layer, a functional layer, and an outer barrier layer improves the environmental performance and degradation resistance of the first plastic film body material. The synergistic effect of the inner barrier layer, functional layer, outer barrier layer, wear-resistant layer, and printing layer enhances the functional design of the packaging bag, meeting diverse needs and making it more practical. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall front view of the structure of this application;

[0025] Figure 2 This is a schematic diagram of the overall rear view structure of this application;

[0026] Figure 3This is a partial top view of the structure of this application;

[0027] Figure 4 This is a partial planar structural diagram of the structure of this application;

[0028] Figure 5 This is a schematic diagram of a partial exploded structure of the present application.

[0029] In the picture:

[0030] 1. First plastic film body; 101. Film layer; 102. Nanofiller; 103. Inner barrier layer; 104. Functional layer; 105. Outer barrier layer; 106. Wear-resistant layer; 107. Printed layer; 2. First heat-sealing layer; 3. Second plastic film body; 4. Second heat-sealing layer; 5. Third heat-sealing layer; 6. Through hole; 7. Sliding strip; 8. Sliding block. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] Please see Figure 1 , Figure 4 and Figure 5 This embodiment of a plastic film packaging bag includes a first plastic film body 1, a first heat-sealing layer 2, and a second plastic film body 3. The first plastic film body 1 is heat-sealed by the first heat-sealing layer 2 to form a packaging bag. The first plastic film body 1 includes a film layer 101 and nanofiller 102 filled inside the film layer 101. The film layer 101 is made of a mixture of polyethylene and polylactic acid. The nanofiller 102 is preferably nano-silica. An inner barrier layer 1 is laminated to the inner surface of the film layer 101 through a co-extrusion process. 03. The inner barrier layer 103 is made of polyadipate, which limits the material of the inner barrier layer 103 and gives it strong barrier performance, making it convenient to use. The inner surface of the inner barrier layer 103 is coated with a functional layer 104. The functional layer 104 is coated with nano-silver antibacterial agent by spraying process on the inner surface of the inner barrier layer 103, which limits the material of the functional layer 104 and can improve the antibacterial effect of the first plastic film body 1, thereby facilitating the storage of materials. The outer surface of the film layer 101 is laminated with an outer barrier layer 105 by co-extrusion process.

[0033] Please see Figure 1 , Figure 4 and Figure 5The outer surface of the outer barrier layer 105 is provided with a wear-resistant layer 106, which is made of polyhydroxyalkanoate. This wear-resistant layer 106 improves the wear resistance of the outer surface of the first plastic film body 1. Furthermore, polyhydroxyalkanoate is biodegradable and suitable for use as an outer layer material. The outer surface of the wear-resistant layer 106 is provided with a printing layer 107, which is made of environmentally friendly ink. The printing layer 107 allows for easy printing of patterns, text, or QR codes on the surface of the first plastic film body 1, enhancing the visual appeal and information transmission function of the packaging bag. The internal structure of the second plastic film body 3 is consistent with the internal structure of the first plastic film body 1, defining the boundaries between the first plastic film body 1 and the second plastic film body 3. The internal structure and material of the second plastic film body 3 ensure that it maintains the same characteristics as the first plastic film body 1, making it convenient to use. Furthermore, the co-extrusion process used to manufacture the first and second plastic film bodies 1 and 3 improves the uniformity of thickness and strength of both bodies, solving the problem of inconsistent film thickness and strength in traditional plastic film packaging bags. In addition, the materials in the first and second plastic film bodies 1 and 3 are mostly biodegradable, improving their environmental performance and degradation resistance.

[0034] Please see Figure 1 , Figure 2 and Figure 3A second heat-sealing layer 4 is provided between the first plastic film body 1 and the second plastic film body 3. The first plastic film body 1 and the second plastic film body 3 are heat-sealed together through the second heat-sealing layer 4. A third heat-sealing layer 5 is provided both inside and outside the second plastic film body 3. The second plastic film body 3 is heat-sealed through the third heat-sealing layer 5 to form the top of the packaging bag, so that the first plastic film body 1 and the second plastic film body 3 can form a sealed packaging bag, which is convenient for storing materials. The top of the third heat-sealing layer 5 has a through hole 6, which allows the packaging bag to be easily hung in a suitable position, optimizing the actual use effect of the packaging bag. A sliding lock strip 7 is installed inside the second plastic film body 3, and a sliding lock block 8 is installed on the outer surface of the sliding lock strip 7. The sliding lock strip 7 and the sliding lock block 8 can be used to conveniently place materials on the packaging bag formed by the first plastic film body 1 and the second plastic film body 3. The packaging bag facilitates the removal of materials from the first plastic film body 1 and the second plastic film body 3. The first heat-sealing layer 2, the second heat-sealing layer 4, and the third heat-sealing layer 5 are all made of low-melting-point polyethylene material. After heating, the first heat-sealing layer 2, the second heat-sealing layer 4, and the third heat-sealing layer 5 melt and adhere to another film to form a strong sealing edge. This is the key to the packaging bag being able to seal and protect the contents. The material of the first heat-sealing layer 2, the second heat-sealing layer 4, and the third heat-sealing layer 5 is limited, which can optimize the heat-sealing process and avoid deformation or reduction in strength of the first plastic film body 1 and the second plastic film body 3 at high temperatures. Furthermore, the first heat-sealing layer 2, the second heat-sealing layer 4, and the third heat-sealing layer 5 are distributed inside and outside the first plastic film body 1 or the second plastic film body 3, respectively. This means that the first plastic film body 1 and the second plastic film body 3 are equipped with heat-sealing material on both the inside and outside, ensuring safety and sealing.

[0035] It should be noted that the polyethylene and polylactic acid mixture is co-extruded to form a film layer 101. The first heat-sealing layer 2, the second heat-sealing layer 4, and the third heat-sealing layer 5 are formed by extruding low-melting-point polyethylene material. Then, the first plastic film body 1 and the second plastic film body 3 are bonded together by a heat-sealing process to form a packaging bag. The co-extrusion process temperature is controlled at 180-200℃. In the spraying process, the nano-silver antibacterial agent is uniformly coated. The heat-sealing process temperature is controlled at 120-140℃. This optimizes the heat-sealing process and avoids deformation or reduction in strength of the first plastic film body 1 and the second plastic film body 3 at high temperatures.

[0036] In this embodiment, a plastic film packaging bag is formed by co-extruding multiple layers to create a first plastic film body 1 and a second plastic film body 3. This improves the thickness uniformity and strength consistency of the first and second plastic film bodies 1 and 3. Furthermore, a first heat-sealing layer 2, a second heat-sealing layer 4, and a third heat-sealing layer 5 are used to heat-seal the first and second plastic film bodies 1 and 3, preventing deformation or strength reduction at high temperatures. The environmental performance and degradation performance of the first plastic film body 1 are improved by the inclusion of a film layer 101, nanofiller 102, inner barrier layer 103, functional layer 104, and outer barrier layer 105. The functional design of the packaging bag is enhanced by the synergistic effect of the inner barrier layer 103, functional layer 104, outer barrier layer 105, wear-resistant layer 106, and printing layer 107, meeting diverse needs and making it more practical.

[0037] The working principle of the above embodiment is as follows: First, a film layer 101 is formed by co-extrusion of a mixture of polyethylene and polylactic acid, and nanofiller 102 is added during the forming process. Then, an inner barrier layer 103 is laminated onto the inner surface of the film layer 101 by co-extrusion. Next, a nano-silver antibacterial agent is sprayed onto the inner surface of the inner barrier layer 103 to form a functional layer 104. Then, an outer barrier layer 105, a wear-resistant layer 106, and a printing layer 107 are sequentially laminated onto the outer surface of the film layer 101 by co-extrusion. Finally, a low-melting-point polyethylene material is extruded to form a first heat-sealing layer 2, which is then laminated with the first plastic film body 1. Finally, the film is heat-sealed. The sealing process involves bonding the edges of the first plastic film body 1 to form the bottom of the packaging bag. Then, the above steps are repeated to make the second plastic film body 3, and the second plastic film body 3 is heat-sealed by the third heat-sealing layer 5. Finally, the first plastic film body 1 and the second plastic film body 3 are heat-sealed together by the second heat-sealing layer 4 to form the packaging bag. In use, the material can be put into the sealed space formed by the first plastic film body 1 and the second plastic film body 3 by pulling the sliding lock block 8. Then, the sliding lock block 8 can be pulled in the opposite direction to lock the sliding lock strip 7 in a sealed state for easy use.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A plastic film packaging bag, comprising a first plastic film body (1), a first heat-sealing layer (2), and a second plastic film body (3), characterized in that: The first plastic film body (1) is heat-sealed by the first heat-sealing layer (2) to form a packaging bag. The first plastic film body (1) includes a film layer (101) and a nanofiller (102) filled inside the film layer (101). The film layer (101) is made of a mixture of polyethylene and polylactic acid. The nanofiller (102) is preferably nano-silica. The inner surface of the film layer (101) is coated with an inner barrier layer (103) by a co-extrusion process. The inner surface of the inner barrier layer (103) is coated with a functional layer (104). The outer surface of the film layer (101) is coated with an outer barrier layer (105) by a co-extrusion process.

2. The packaging bag made of plastic film according to claim 1, characterized in that: The inner barrier layer (103) is made of polyadipate, and the functional layer (104) is coated on the inner surface of the inner barrier layer (103) by a spraying process with nano-silver antibacterial agent.

3. A plastic film packaging bag according to claim 1, characterized in that: The outer surface of the outer barrier layer (105) is provided with a wear-resistant layer (106), which is made of polyhydroxy fatty acid ester.

4. A plastic film packaging bag according to claim 3, characterized in that: The outer surface of the wear-resistant layer (106) is provided with a printing layer (107), which is made of environmentally friendly ink.

5. A plastic film packaging bag according to claim 1, characterized in that: A second heat-sealing layer (4) is provided between the first plastic film body (1) and the second plastic film body (3). The first plastic film body (1) and the second plastic film body (3) are heat-sealed together by the second heat-sealing layer (4). A third heat-sealing layer (5) is provided inside and outside the second plastic film body (3). The second plastic film body (3) is heat-sealed by the third heat-sealing layer (5) and forms the top of the packaging bag.

6. A plastic film packaging bag according to claim 5, characterized in that: The top of the third heat-sealing layer (5) is provided with a through hole (6).

7. A plastic film packaging bag according to claim 1, characterized in that: The second plastic film body (3) has a sliding lock strip (7) installed inside, and a sliding lock block (8) is installed on the outer surface of the sliding lock strip (7).

8. A plastic film packaging bag according to claim 5, characterized in that: The internal structure of the second plastic film body (3) is consistent with the internal structure of the first plastic film body (1), and the first heat-sealing layer (2), the second heat-sealing layer (4) and the third heat-sealing layer (5) are all made of low-melting-point polyethylene material.

Images