Plastic film with multi-layer composite structure

Abstract

The utility model discloses a plastic film with a multi-layer composite structure, which relates to the technical field of plastic films and comprises a polylactic acid film and polyimide strips, the polyimide strips are attached to two sides of the polylactic acid film, and the arrayed polyimide strips are staggered mutually and form arrayed grids on two sides of the polylactic acid film. A cross layer is formed at the interlaced part of the polyimide strips, and a left-right through outer opening is formed in one side, far away from the polylactic acid film, of the cross layer. The plastic film is simple in structure and convenient to produce, the polylactic acid film serves as a main body, the polyimide material is used for supporting, so that the film is not prone to breakage and convenient to degrade, the part made of the polyimide material is convenient to break at the specific position, a user can break the coiled plastic film conveniently, practicability is high, and the plastic film is suitable for being popularized.

Description

Technical Field

[0001] The utility model belongs to the technical field of plastic films, and particularly relates to a plastic film with a multi-layer composite structure. Background Art

[0002] Plastic films are made of polyvinyl chloride, polyethylene, polypropylene, polystyrene and other resins, and are used for packaging and as a coating layer. Among them, thermosetting polyimide has excellent thermal stability, chemical corrosion resistance and mechanical properties, and is usually orange-yellow, and is used for slot insulation of motors and cable wrapping materials. And polylactic acid film, as a biodegradable material, is widely used in the fields of packaging, agriculture, biomedicine and textiles, promoting green development.

[0003] Although the film of polylactic acid material is easy to degrade, it is easy to tear. The film of polyimide material itself has toughness, is not easy to cut off and degrade, and is easy to cause environmental pollution. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a plastic film with a multi-layer composite structure, which has a simple structure and is convenient for production. It takes the polylactic acid film as the main body and is supported by the polyimide material, so that the film is not easy to break and is convenient for degradation. The part composed of the polyimide material is easy to break at a specific position, which is convenient for the user to break the rolled plastic film, and has strong practicability and is suitable for popularization.

[0005] The utility model provides the following technical solution: a plastic film with a multi-layer composite structure, including a polylactic acid film and polyimide strips. The polyimide strips are attached to both sides of the polylactic acid film. The arrayed polyimide strips intersect with each other, and they form an array of grids on both sides of the polylactic acid film. A cross layer is formed at the intersection of the polyimide strips, and an outer opening that penetrates from left to right is provided on the side of the cross layer away from the polylactic acid film.

[0006] Preferably, the polyimide strip is equipped with a roller. The pattern on the outer side wall of the roller matches the grid formed by the polyimide strip. The liquefied polyimide is adhered to the roller, and the polyimide strip is formed by passing the polylactic acid film through between the two rollers.

[0007] Preferably, a connecting layer is provided at the bottom of the outer opening of the cross layer. The thickness of the connecting layer is less than the depth of the outer opening, and the outer opening runs across the cross layers in the same row.

[0008] Preferably, the inner wall of the opening of the outer opening is an outward inclined wall. Convex strips that are symmetric to each other are provided at the opening of the outer opening. The angle between the opposite side wall of the convex strip and the inclined wall is an obtuse angle.

[0009] Advantages of the present utility model: The structure is simple and convenient for production. With a polylactic acid film as the main body and supported by a polyimide material, the film is not easily broken and is convenient for degradation. The part composed of the polyimide material is easy to break at a specific position, facilitating the user to break the rolled plastic film. It has strong practicability, specifically as follows:

[0010] (1) The present utility model is provided with polyimide strips, which form a network on both sides of the polylactic acid film. When producing the composite film, the polylactic acid film is passed through between two rollers, and the rollers are coated with polyimide liquid. The polyimide layer is formed on both sides of the polylactic acid film through the patterns on the rollers. After the polyimide liquid solution cools, the formed composite film has toughness while having a low content of polyimide material. The main body is the polylactic acid film, which is convenient for degradation and is also convenient for attaching the polyimide layer to the polylactic acid film.

[0011] (2) The present utility model is provided with an outer opening. According to the usage, the polyimide film is mostly a hard film. When the composite film needs to be truncated, it is folded at the outer opening of the cross layer. During the bending process, two convex strips support, and a cavity is formed at the inclined wall, forming an outward tension at the connection layer, making it easier to break at the connection layer. The polylactic acid film is a soft film and can be directly torn after losing the support of the polyimide strips, facilitating the truncation of the composite film. Description of the Drawings

[0012] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0013] Figure 1 is the overall schematic diagram of the present utility model;

[0014] Figure 2 is the cross-sectional view of the present utility model;

[0015] Figure 3 is the enlarged view of part A of the present utility model;

[0016] In the figure, the labels are: 1, polylactic acid film; 2, polyimide strip; 3, grid; 4, cross layer; 5, outer opening; 6, connection layer; 7, inclined wall; 8, convex strip. Detailed Embodiment

[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model; obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present utility model.

[0018] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "top / bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0020] The structural features of the utility model are now described in detail with reference to the accompanying drawings of the specification.

[0021] See also Figure 1-2 A multi-layer composite structure plastic film includes a polylactic acid film 1 and a polyimide strip 2. The polyimide strip 2 is attached to both sides of the polylactic acid film 1. The array of polyimide strips 2 is interlaced to form a mesh layer. The array of grids 3 is formed on both sides of the polylactic acid film 1. The grid 3 is covered by the polylactic acid film 1. This structure reduces the use of polyimide materials, and the mesh polyimide strips 2 provide support for the polylactic acid film 1. The polyimide strips 2 are equipped with rollers. The outer wall pattern of the roller matches the grid formed by the polyimide strips 2. The roller is stained with liquefied polyimide. The polyimide strips 2 are formed by passing the polylactic acid film 1 between two rollers. When the film is produced, the polylactic acid film 1 is passed between the two rollers. The roller is stained with polyimide liquid. The polyimide layer is formed on both sides of the polylactic acid film 1 through the texture on the roller, which is convenient for the production of the composite film.

[0022] See also Figure 1 , 3, an intersection layer 4 is formed at the intersection of the polyimide strips 2. An outer opening 5 that penetrates from left to right is provided on the side of the intersection layer 4 away from the polylactic acid film 1. A connecting layer 6 is provided at the bottom of the outer opening 5 of the intersection layer 4. When the connecting layer 6 breaks, the composite film can be truncated. The thickness of the connecting layer 6 is less than the depth of the outer opening 5. The outer opening 5 traverses the intersection layers 4 in the same row. The inner wall of the opening of the outer opening 5 is an outwardly inclined wall 7. Convex strips 8 that are symmetric to each other are provided at the opening of the outer opening 5. The angle between the opposite side walls of the convex strips 8 and the inclined wall 7 is an obtuse angle. When bending along the outer opening 5, the two convex strips 8 support, and a cavity is formed at the inclined wall 7, and an outward tension is formed at the connecting layer 6, making it easier for the connecting layer 6 to be broken.

[0023] The multi-layer composite structure plastic film of the present utility model has a simple structure and is convenient for production. It takes the polylactic acid film as the main body and is supported by the polyimide material, making the film not easy to break and facilitating degradation. The part composed of the polyimide material is easy to break at a specific position, facilitating the user to break the rolled plastic film, with strong practicability and suitable for popularization.

[0024] Specifically, when in use, refer to Figure 1-3 , when producing the composite film, pass the polylactic acid film 1 through between two rollers. The rollers are coated with polyimide liquid, and polyimide layers are formed on both sides of the polylactic acid film 1 through the patterns on the rollers. After the polyimide liquid solution cools, the formed composite film has toughness while having a low content of polyimide material. The main body is the polylactic acid film 1, which is easy to degrade. When the composite film needs to be truncated, fold it at the outer opening 5 of the intersection layer 4. During the bending process, the two convex strips 8 support, and a cavity is formed at the inclined wall 7, and an outward tension is formed at the connecting layer 6, making it easier for the connecting layer 6 to be broken. The polylactic acid film 1 is a soft film and can be directly torn after losing the support of the polyimide strips 2.

[0025] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A multi-layer composite plastic film, comprising a polylactic acid film (1) and a polyimide strip (2), characterized in that, The polyimide strips (2) are attached to both sides of the polylactic acid film (1). The arrayed polyimide strips (2) intersect with each other, forming an array of grids (3) on both sides of the polylactic acid film (1). A cross layer (4) is formed at the intersection of the polyimide strips (2). An outer opening (5) that penetrates from left to right is provided on the side of the cross layer (4) away from the polylactic acid film (1).

2. The multi-layer composite plastic film according to claim 1, characterized in that, The polyimide strips (2) are equipped with rollers. The pattern on the outer sidewall of the rollers matches the grids formed by the polyimide strips (2). The rollers are stained with liquefied polyimide, and the polyimide strips (2) are formed by passing through between two rollers through the polylactic acid film (1).

3. The multi-layer composite plastic film according to claim 1, characterized in that, A connecting layer (6) is provided at the bottom of the outer opening (5) of the cross layer (4). The thickness of the connecting layer (6) is less than the depth of the outer opening (5). The outer opening (5) runs across the cross layers (4) in the same row.

4. The multi-layer composite plastic film according to claim 3, characterized in that, The inner wall of the opening of the outer opening (5) is an outwardly inclined wall (7). Symmetric convex strips (8) are provided at the opening of the outer opening (5). An obtuse angle is formed between the opposite sidewalls of the convex strips (8) and the inclined wall (7).

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