Composite film and packaging bag

Abstract

The utility model discloses a kind of composite film and packaging bag, the composite film includes first face layer, pattern layer and first heat-seal layer in turn from outside to inside, pattern layer has preset surface texture for forming embossing on first face layer;First face layer is fixedly connected to one side of pattern layer by first showering film adhesive layer, so that the outer surface of first face layer forms embossing;First heat-seal layer is fixedly connected to the other side of pattern layer.The utility model is by first face layer, pattern layer and first heat-seal layer composite structure, with preset surface texture pattern layer as internal physical template, and using first showering film adhesive layer, the texture of first face layer of most outside is copied pattern layer, to form physical embossing. Since the embossing is the physical structure inherent to first face layer rather than external additional coating, therefore have very high wear resistance and stability, fundamentally solve the problem that coating in background art is caused by easy abrasion and fall off and leads to touch effect not lasting.

Description

Technical Field

[0001] This utility model relates to the field of packaging technology, and in particular to a composite film and packaging bag. Background Technology

[0002] With the upgrading of consumption and the intensification of market competition, product packaging not only carries the functions of protection and information transmission, but its tactile experience when held is also increasingly becoming an important factor influencing consumers' purchasing decisions, especially in the fields of high-end food and cosmetics.

[0003] To achieve a unique tactile feel in packaging, a common approach is to coat the outermost surface of the packaging bag with a special coating (such as tactile oil, matte oil, or rubber paint). For example, a coating with fine particles can create a frosted or skin-like texture. However, this method, which relies on surface coatings, has inherent drawbacks: as an additional layer attached to the surface, the coating is easily worn away or even peels off due to friction and scratches during product storage, transportation, and shelf placement, resulting in a decline in the tactile feel of the packaging bag.

[0004] Therefore, how to overcome the limitations of existing coating technologies and develop a structurally stable and durable packaging bag to meet the growing market demand for high-quality packaging is an urgent problem to be solved in this field. Utility Model Content

[0005] The main purpose of this utility model is to provide a composite film and packaging bag to solve the above-mentioned technical problems.

[0006] The objective of this utility model can be achieved by adopting the following technical solution:

[0007] A composite film comprises, from the outside to the inside, a first surface layer, a patterned layer, and a first heat-sealing layer. The patterned layer has a preset surface texture for forming embossing on the first surface layer. The first surface layer is fixed to one side of the patterned layer by a first coating adhesive layer, such that the embossing is formed on the outer surface of the first surface layer. The first heat-sealing layer is fixed to the other side of the patterned layer.

[0008] The first surface layer is a PET printed film, a PP printed film, a composite structure of a PET printed film and an aluminized PET film, or a composite structure of a PP printed film and an aluminized PET film.

[0009] The patterned layer is a non-woven fabric layer or a woven fabric layer.

[0010] The patterned layer is a non-woven fabric layer.

[0011] The nonwoven fabric layer has a unit area mass of 20-60 g / m².

[0012] The thickness of the first coating adhesive layer is 15-30 μm.

[0013] The first heat-sealing layer includes, from the outside to the inside, a second coating adhesive layer and a heat-adhesive layer, or the first heat-sealing layer is a coating heat-adhesive layer.

[0014] A packaging bag comprising a bag body made of the aforementioned composite film.

[0015] The packaging bag is a stand-up pouch, which also includes a bottom at the bottom of the bag body and a zipper closure on one side of the bag body; the bottom of the bag includes a second outer layer and a second heat-sealing layer from the outside to the inside.

[0016] The packaging bag is a three-seal bag, and the three-seal bag also includes a vent hole on one side of the bag body.

[0017] The beneficial technical effects of this utility model are as follows:

[0018] This invention utilizes a composite structure of "first surface layer - patterned layer - first heat-sealing layer," using a patterned layer with a pre-defined surface texture as an internal physical "template." A first coating adhesive layer is then used to replicate the texture of the patterned layer on the outermost surface layer, thus forming a physical embossing. Because this embossing is an inherent physical structure of the first surface layer rather than an externally applied coating, it exhibits extremely high wear resistance and stability, fundamentally solving the problem in the prior art where coatings easily wear off, resulting in a lack of lasting tactile feedback. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic cross-sectional view of the composite membrane provided in an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of an embodiment of the first heat-sealing layer in the composite film provided by this utility model;

[0022] Figure 3 A schematic diagram of another embodiment of the first heat-sealing layer in the composite film provided by this utility model;

[0023] Figure 4 The packaging bag provided in this embodiment of the utility model is specifically a front view of a stand-up pouch;

[0024] Figure 5The packaging bag provided in this embodiment of the utility model is a schematic diagram of the bottom cross-section of a stand-up pouch;

[0025] Figure 6 The packaging bag provided in this embodiment of the utility model is specifically a three-seal bag front view.

[0026] Explanation of reference numerals in the attached figures:

[0027] In the diagram: 10-first surface layer, 20-patterned layer, 30-first heat-sealing layer, 31-second coating adhesive layer, 32-heat-sealing layer, 33-coating heat-sealing layer, 40-first coating adhesive layer, 50-bag body, 60-bag bottom, 61-second surface layer, 62-second heat-sealing layer, 70-zipper seal, 80-vent hole. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0029] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0030] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0031] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0032] like Figures 1-3As shown, this utility model embodiment provides a composite film, which aims to form a physical embossing with excellent tactile feel and stability on the outer surface of the film through a layered structure, replacing the existing solution that relies on chemical coatings. The composite film comprises, from the outside to the inside, a first surface layer 10, a patterned layer 20, and a first heat-sealing layer 30. The patterned layer 20 has a preset surface texture for forming embossing on the first surface layer 10. The first surface layer 10 is fixed to one side of the patterned layer 20 by a first coating adhesive layer 40, so that the embossing is formed on the outer surface of the first surface layer 10. The first heat-sealing layer 30 is fixed to the other side of the patterned layer 20.

[0033] In this embodiment, the composite film, from its outer side to its inner side, sequentially includes a first surface layer 10, a patterned layer 20, and a first heat-sealing layer 30. These three main functional layers are combined into a whole through a composite process.

[0034] The first surface layer 10 is the outermost protective and appearance-bearing layer of the composite film.

[0035] The patterned layer 20 is disposed on the inner side of the first surface layer 10. The patterned layer 20 is not a smooth plane, but has a pre-designed surface texture with three-dimensional undulations. The shape and distribution of this surface texture are pre-designed, and its fundamental purpose is that when it is combined with the first surface layer 10, it can "transfer" or "replicate" its own texture shape to the outer surface of the first surface layer 10, thereby forming an embossed texture that the end user can touch and perceive.

[0036] To achieve the transfer and fixation of the aforementioned texture, the first surface layer 10 is fixed to one side (i.e., the outer side) of the patterned layer 20 by a first coating adhesive layer 40. Specifically, during the preparation process, molten adhesive resin material is extruded uniformly in the form of a thin film through the die head of the coating equipment and coated onto the surface to be laminated, either the first surface layer 10 or the patterned layer 20, and then another layer is quickly pressed together. Due to the fluidity of the molten first coating adhesive layer 40, under the pressure of the pressure roller, the upper, relatively flexible first surface layer 10 will closely adhere to the uneven surface contour of the lower patterned layer 20. After the first coating adhesive layer 40 cools and solidifies, the first surface layer 10 and the patterned layer 20 are firmly bonded together. At the same time, the three-dimensional texture of the patterned layer 20 is stably "replicated" onto the outer surface of the first surface layer 10, forming the target embossing. This embossing, formed by physical means, is part of the structure and is therefore very stable and wear-resistant.

[0037] The first heat-sealing layer 30, as the innermost layer of the composite film, primarily functions to provide heat-sealing properties. When this composite film is subsequently used to manufacture packaging bags, the first heat-sealing layer 30 can be melted and bonded together by heating and pressurizing, thereby forming a strong sealing edge. The first heat-sealing layer 30 is firmly bonded to the inner surface of the patterned layer 20, ultimately forming a structurally stable and non-peelable complete composite film.

[0038] In summary, the composite film of this embodiment uses a patterned layer 20 with a preset surface texture as an intermediate layer and uses a first coating adhesive layer 40 to bond it to the first surface layer 10, forming a stable and durable physical embossing on the outer surface of the first surface layer 10. This solves the problem of poor durability caused by the reliance on external coatings in the prior art, while also giving the composite film an excellent tactile feel.

[0039] In one embodiment, the first surface layer 10 is a composite structure of PET printed film, PP printed film, PET printed film and aluminized PET film, or a composite structure of PP printed film and aluminized PET film.

[0040] In this embodiment, the first surface layer 10, as the outermost layer of the composite film, not only carries the printed pattern but also protects the internal patterned layer 20 and the overall structure. The first surface layer 10 can be made from one of the following preferred material forms:

[0041] PET printed film: This is a surface layer formed by printing on the surface of polyethylene terephthalate (PET) film as a substrate.

[0042] PP printed film: This refers to a surface layer formed by printing on a polypropylene (PP) film substrate. PP films (such as BOPP biaxially oriented polypropylene film) have good moisture resistance, transparency, and printability.

[0043] Composite structure of PET printed film and aluminized PET film: This is a composite first layer 10. It consists of two layers: an outer PET printed film and an inner aluminized PET film. Aluminized PET film is formed by vacuum-depositing an extremely thin layer of metallic aluminum onto the surface of a PET film, possessing excellent barrier properties (such as oxygen barrier, moisture barrier, and light barrier) and a metallic luster. Compositeting it with PET printed film significantly enhances the barrier properties and shelf-viewing effect of the entire composite film while maintaining good printing results, giving the packaging bag a high-end metallic texture.

[0044] Composite structure of PP printed film and metallized PET film: Similar to the previous one, this is also a composite first layer 10. The outer layer is PP printed film, and the inner layer is metallized PET film. This combination combines the printing economy of PP film with the excellent barrier properties and metallic luster of metallized PET film.

[0045] In one embodiment, the patterned layer 20 is a non-woven fabric layer or a woven fabric layer.

[0046] In this embodiment, the patterned layer 20 is a non-woven fabric layer, which is made of oriented or randomly arranged fibers through friction, cohesion, or bonding, or a combination of these methods. Non-woven fabric itself has a porous structure and a certain degree of bulkiness, and its surface naturally possesses certain textures, such as textures formed by randomly arranged fibers or regular dotted or linear textures formed through specific processes (such as hot rolling). Furthermore, the non-woven fabric layer also has good elasticity and flexibility. When it is laminated as the patterned layer 20 under the first surface layer 10, not only can its three-dimensional texture be effectively transferred to the first surface layer 10 to form embossing, but its own elasticity and flexibility also give the composite film a unique, soft, and cushioned grip feel.

[0047] In another specific embodiment, the patterned layer 20 is a woven fabric layer, which is a fabric made of two or more sets of mutually perpendicular yarns (i.e., warp and weft yarns) interwoven according to a certain pattern. The woven fabric has a clear and regular weave structure, such as plain weave or twill weave. This regular weave, as a preset surface texture, can form a very clear and regular embossed pattern on the outer surface of the first surface layer 10 after being laminated with the first coating adhesive layer 40, giving the composite film a unique texture and anti-slip properties.

[0048] In the above embodiments, selecting a non-woven fabric layer or a woven fabric layer as the pattern layer 20 can effectively utilize their inherent surface texture and physical properties to form a stable embossed texture with a good tactile feel on the first surface layer 10, thereby improving the overall texture of the composite film.

[0049] In one embodiment, the patterned layer 20 is a non-woven fabric layer.

[0050] In this embodiment, the nonwoven fabric is typically made of fibers from polymer materials such as polypropylene (PP) and polyester (PET). The fiber arrangement can be random or oriented, and different production processes (such as spunbonding, meltblowing, hot rolling, needle punching, etc.) can be used to form nonwoven fabrics with different surface characteristics and mechanical properties. These different surface characteristics constitute the desired "preset surface texture".

[0051] For example, some thermally rolled nonwoven fabrics have regular dotted or diamond-shaped embossed dots on their surface, which inherently possess a three-dimensional feel. When this nonwoven fabric layer is laminated to the first surface layer 10 via the first coating adhesive layer 40, the first surface layer 10 naturally conforms to the contours of these embossed dots, thereby forming corresponding embossing on its outer surface. More importantly, the nonwoven fabric layer has good softness and elasticity, and this characteristic can be transferred to the entire composite film after lamination. This allows users to not only feel the three-dimensionality of the embossing when touching the surface of the composite film, but also experience a soft, elastic, and unique tactile feel, significantly enhancing the user's tactile experience.

[0052] In one embodiment, the unit area mass of the nonwoven fabric layer is 20-60 g / m².

[0053] In this embodiment, the selection of this parameter range aims to achieve a good balance between the embossing effect and the overall physical properties of the composite film. On the one hand, if the unit area mass is less than 20 g / m², the nonwoven layer may be too thin, resulting in insufficient three-dimensional texture and making it difficult to form a clear and tactile embossing on the first surface layer 10. On the other hand, if the unit area mass is greater than 60 g / m², the composite film may appear too thick and stiff, affecting its flexibility and suitability for subsequent bag-making processes, and increasing material costs.

[0054] Therefore, controlling the unit area mass of the nonwoven fabric layer within this preferred range helps to maintain the overall good performance of the composite film while ensuring the formation of a stable and clear embossing effect.

[0055] In one embodiment, the pattern of the nonwoven fabric layer can be at least one of sesame dot pattern, square pattern, wavy pattern, honeycomb pattern or plain pattern.

[0056] In this embodiment, these pattern types are formed during the production of nonwoven fabric through specific hot rolling or other molding processes. Sesame-dot, square, and honeycomb patterns can create discrete or continuous raised and recessed contact points with clear geometric regularity, providing a regular and textured tactile experience. Wavy patterns can create smooth, directional textures that guide the user's tactile sensation. Plain weave patterns are a basic, delicate texture similar to interwoven fabric, giving the packaging a subtle, natural woven feel.

[0057] By selecting one or more of the above-mentioned nonwoven fabric patterns, you can flexibly meet the personalized needs of different products for tactile style.

[0058] In one embodiment, the thickness of the first coating adhesive layer 40 is 15-30 μm.

[0059] In this embodiment, the thickness of the first coating adhesive layer 40 is controlled within the range of 15-30 μm, which allows the first surface layer 10 to clearly and accurately replicate the surface texture of the pattern layer 20 while ensuring good adhesive strength. For example, in a specific preparation process, the thickness of the first coating adhesive layer 40 can be controlled at about 20 μm to obtain ideal embossing effect and interlayer bonding force.

[0060] In one embodiment, the first heat-sealing layer 30 includes, from the outside to the inside, a second coating adhesive layer 31 and a heat-adhesive layer 32, or the first heat-sealing layer 30 is a coating heat-adhesive layer 33.

[0061] In this embodiment, the "outside to inside" order refers to the direction from the side closest to the patterned layer 20 to the innermost side of the composite film. The second coating adhesive layer 31 is a layer that directly contacts and adheres to the inner surface of the patterned layer 20. It is formed through a coating composite process, and its function is to act as an adhesive medium to firmly bond the heat-adhesive layer 32 to the patterned layer 20. The material and process of this layer can be the same as or similar to the coating adhesive layer (i.e., the first coating adhesive layer) used to bond the first surface layer 10 and the patterned layer 20. The heat-adhesive layer 32 is the innermost layer of the composite film and is the main layer that ultimately achieves the heat-sealing function. It is a pre-fabricated thin film with good low-temperature heat-sealing performance.

[0062] In another specific embodiment, the first heat-sealing layer 30 is a coated heat-adhesive layer 33. This is a single-layer structure. In this structure, the "coated heat-adhesive layer 33" refers to a layer that combines both adhesive and heat-sealing functions, formed directly on the inner side of the patterned layer 20 through a coating process. Specifically, resin, which itself has heat-sealing properties, is directly extruded and coated onto the inner surface of the patterned layer 20 in a molten state through the die of a coating equipment. After cooling and curing, this layer acts as an "adhesive" for bonding with the patterned layer 20, and its innermost exposed surface can be directly used for subsequent heat-sealing processes. The advantage of this form is that the process steps are simplified, and the preparation of the inner layer can be completed in one coating process, which helps to improve production efficiency and reduce costs.

[0063] like Figures 4-6 As shown, corresponding to the above-mentioned composite film, this utility model embodiment also provides a packaging bag, which includes a bag body 50 made of the composite film of any of the foregoing embodiments.

[0064] In this embodiment, during the bag-making process, the composite film roll prepared in any of the aforementioned embodiments is cut to a preset size. Then, the cut composite film is folded in half or two composite films are joined together so that their first heat-sealing layers 30 (i.e., the innermost layer) are facing each other. Subsequently, the peripheral edges (e.g., the two side edges and / or the bottom edge) of the bag body 50 are heated and pressurized using a heat-sealing device. Under the action of heat, the first heat-sealing layers 30 melt and adhere to each other, forming a strong sealing edge after cooling, thereby constituting a bag body 50 with a receiving space.

[0065] Since the bag body 50 is made of the composite film provided in the aforementioned embodiment, its outer surface naturally inherits the stable and clear embossing on the first layer 10 of the composite film. When consumers hold or touch the packaging bag, they can feel the rich, comfortable, and unique tactile sensation brought by the physical embossing and the elasticity of the internal pattern layer 20 through their fingertips. This tactile experience is not easily lost due to friction or scratches, has excellent durability, and significantly enhances the quality of the packaging bag and the user experience.

[0066] In one embodiment, the packaging bag is a stand-up pouch, which further includes a bottom 60 disposed at the bottom of the bag body 50 and a zipper closure 70 disposed on one side of the bag body 50; the bottom 60 includes a second surface layer 61 and a second heat-sealing layer 62 from the outside to the inside.

[0067] In this embodiment, in addition to the bag body 50 made of the aforementioned composite film, the self-standing bag further includes the following structure:

[0068] A bottom 60 is disposed at the bottom of the bag body 50. The bottom 60 is formed by folding another piece of material and heat-sealing it to the lower edge of the bag body 50. Its structure allows the packaging bag to stand stably on a flat surface after being filled with contents. The material structure of the bottom 60 can include a second surface layer 61 and a second heat-sealing layer 62 from the outside to the inside. The second surface layer 61 can use the same material and printing as the first surface layer 10 of the bag body 50 to maintain overall visual consistency; the second heat-sealing layer 62 is used to heat-seal the first heat-sealing layer 30 of the bag body 50.

[0069] A zipper closure 70 is provided on one side of the bag body 50. The zipper closure 70 includes an opening and a pair of interlocking convex and concave fasteners (not shown in the attached figures), which are fixed to the opening by means of heat pressing or other methods. The zipper closure 70 provides the packaging bag with a reusable opening and sealing function, facilitating repeated access to the contents by the consumer.

[0070] During manufacturing, the pre-made bag body 50, bag bottom 60, and zipper closure 70 are assembled and connected into a single stand-up pouch using a heat-sealing process. This stand-up pouch not only boasts excellent tactile feel and upright display capabilities but also offers ease of use, making it particularly suitable for packaging high-end food, pet food, and daily chemical products.

[0071] In one embodiment, the packaging bag is a three-seal bag, and the three-seal bag further includes a vent 80 disposed on one side of the bag body 50.

[0072] In this embodiment, the typical feature of this three-sealed bag is that the three edges (side edges and bottom edge) of the bag body 50 are sealed by a heat-sealing process, leaving only the top edge as an opening for filling the contents. After the contents are filled, the top edge is also heat-sealed.

[0073] The three-sealed bag also includes a vent 80 located on one side (front or back) of the bag body 50. This vent 80 can be a simple mechanical punch or a one-way vent valve. The main purpose of the vent 80 is to allow gases generated inside the packaging to escape, preventing bag bloating, especially for fermented products like coffee beans. It also allows excess air to escape during transport and stacking, saving storage and logistics space.

[0074] This three-seal bag has a simple structure and high production efficiency. Combined with the unique tactile feel of the composite film in the aforementioned embodiments, it greatly enhances the packaging's premium feel while maintaining a cost advantage, making it suitable for various products that require sealed packaging.

[0075] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A composite membrane, characterized in that, From the outside to the inside, the structure includes a first surface layer, a patterned layer, and a first heat-sealing layer. The patterned layer has a preset surface texture for forming embossing on the first surface layer. The first surface layer is fixed to one side of the patterned layer by a first coating adhesive layer, so that the embossing is formed on the outer surface of the first surface layer. The first heat-sealing layer is fixed to the other side of the patterned layer.

2. The composite membrane according to claim 1, characterized in that, The first surface layer is a PET printed film, a PP printed film, a composite structure of a PET printed film and an aluminized PET film, or a composite structure of a PP printed film and an aluminized PET film.

3. The composite membrane according to claim 1, characterized in that, The patterned layer is a non-woven fabric layer or a woven fabric layer.

4. The composite membrane according to claim 1, characterized in that, The patterned layer is a non-woven fabric layer.

5. The composite membrane according to claim 4, characterized in that, The unit area mass of the nonwoven fabric layer is 20-60 g / m².

6. The composite membrane according to claim 1, characterized in that, The thickness of the first coating adhesive layer is 15-30 μm.

7. The composite membrane according to claim 1, characterized in that, The first heat-sealing layer includes, from the outside to the inside, a second coating adhesive layer and a heat-adhesive layer, or the first heat-sealing layer is a coating heat-adhesive layer.

8. A packaging bag, characterized in that, Includes a bag made of the composite film as described in any one of claims 1 to 7.

9. The packaging bag according to claim 8, characterized in that, The packaging bag is a stand-up pouch, which also includes a bottom at the bottom of the bag body and a zipper closure on one side of the bag body; the bottom of the bag includes a second outer layer and a second heat-sealing layer from the outside to the inside.

10. The packaging bag according to claim 8, characterized in that, The packaging bag is a three-seal bag, and the three-seal bag also includes a vent hole on one side of the bag body.

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