Paper-plastic composite bag with reinforcing rib

Abstract

The utility model provides a paper -plastic composite bag with reinforcing bar relates to paper -plastic composite bag technical field. The paper -plastic composite bag uneven wave -shaped reinforcing structure is arranged in the utility model's bag body side, and the directional reinforcing side edge tear resistance is used, and the local thickness and structural complexity of side edge are increased by the bar -like convex, can disperse the stress concentration under the action of external force, when the side edge is subjected to the tearing force, the convex structure can hinder the crack propagation, improve the tear resistance of paper -plastic bag, compared with the bag body of the overall thickening for the strength promotion, can reduce the material consumption while guaranteeing the strength.

Description

Technical Field

[0001] This utility model belongs to the field of paper-plastic composite bag technology, specifically relating to a paper-plastic composite bag with reinforcing ribs. Background Technology

[0002] Paper-plastic composite bags are widely used in packaging for chemical, building material, and food industries because they combine the environmental friendliness of paper with the moisture resistance of plastic. Current paper-plastic composite bags typically consist of a bag body made of paper and plastic layers, with the sides connected by heat sealing or sewing. However, during load-bearing or handling, the sides of the bag are prone to tearing due to localized stress concentration. Especially when the contents are heavy or subjected to external impact, the tear may propagate along the sides, leading to packaging failure.

[0003] In existing technologies, methods to enhance the strength of paper-plastic composite bags mostly focus on increasing the overall thickness of the bag or increasing the proportion of plastic layers. However, this leads to increased material costs and does not specifically reinforce the sides, which are prone to tearing. Therefore, there is an urgent need for a paper-plastic composite bag with optimized side tear resistance through structural design. Utility Model Content

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A paper-plastic composite bag with reinforcing ribs includes a bag body composed of a paper layer and a plastic reinforcing layer. The bag body has a front, a back, and a side connecting the front and back. The inner surface of the side has wavy rib-like protrusions extending along the height direction of the bag body. The peaks and troughs of the wavy rib-like protrusions are alternately distributed along the extension direction and are integrally formed with the composite layer of the side through a co-extrusion process. The interior of the wavy rib-like protrusions has hollow channels that extend along the extension direction to enhance the tear resistance and cushioning performance of the side.

[0006] Preferably, the paper layer consists of a kraft paper layer and a reinforcing fiber web layer.

[0007] Preferably, the wavy, rib-like protrusions are distributed at non-uniform intervals along the width direction of the side.

[0008] Preferably, a reinforcing ridge is provided at the connection between the side and the front and back sides.

[0009] Preferably, the wavy, ribbed plastic layer material is a blend of polyethylene and maleic anhydride-grafted polypropylene, which is formed simultaneously with the paper layer through a co-extrusion process.

[0010] Preferably, the hollow channel with wavy, ribbed protrusions is extracted after being formed by an embedded core mold.

[0011] The beneficial effects of this utility model are:

[0012] The side tear resistance is enhanced by directional reinforcement. Rib-like protrusions increase the local thickness and structural complexity of the side, which can disperse stress concentration under external force. When the side is subjected to tearing force, the protruding structure can prevent crack propagation and improve the tear resistance of paper-plastic bags.

[0013] By employing structural reinforcement methods, compared to thickening the entire bag to increase strength, the amount of material used can be reduced while maintaining strength.

[0014] The ribbed protrusions are integrally formed with the bag body composite layer, making it compatible with existing paper-plastic composite bag production lines and enabling mass production without equipment modification. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained through these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of a paper-plastic composite bag;

[0018] In the diagram: 1 - Front; 2 - Back; 3 - Side; 4 - Rib-like protrusion; 5 - Reinforcing ridge; 6 - Kraft paper layer; 7 - Reinforcing fiber mesh layer; 8 - Plastic reinforcing layer. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] like Figure 1-2 A paper-plastic composite bag with reinforcing ribs includes a bag body composed of a paper layer and a plastic reinforcing layer 8. The bag body has a front side 1, a back side 2, and a side side 3 connecting the front side 1 and the back side 2. The inner surface of the side side 3 has wavy, rib-like protrusions 4 extending along the height direction of the bag body. The peaks and troughs of these wavy, rib-like protrusions 4 are alternately distributed along the extension direction and are also non-uniformly spaced along the width direction of the side side 3, thus forming unevenly spaced reinforcing spaces at the side side 3. When the side side 3 of the paper-plastic bag is subjected to external force, the force can be effectively dispersed through these rib-like protrusions 4. Due to the uneven spacing of the rib-like protrusions 4, stress concentration is less likely to occur at a fixed position when the force is dispersed, further reducing the possibility of bag breakage.

[0022] The rib-like protrusions 4 on the side 3 of the paper-plastic bag and the plastic reinforcing layer 8 on the side 3 are integrally formed by co-extrusion process. The plastic reinforcing layer 8 is a blend of polyethylene and maleic anhydride grafted polypropylene, which has sufficient mechanical strength and good elasticity, is not easy to break, and has strong bonding force with the paper-plastic bag material. The rib-like protrusions 4 also have hollow channels running through the extension direction inside. After being formed by embedded core mold, they are extracted, which ensures the strength of the protrusion while reducing weight and production costs.

[0023] The paper-plastic bag of this invention consists of a kraft paper layer 6 and a reinforcing fiber mesh layer 7. This not only enhances the structural strength of the paper layer itself, but also improves the bonding strength between the plastic reinforcing layer 8 and the paper layer due to the increased contact area provided by the fiber mesh. Reinforcing ribs 5 are also provided at the junctions of the side edge 3 with the front edge 1 and back edge 2 of the paper-plastic bag, further enhancing the bag's strength, reducing weak points, and making it less prone to breakage.

[0024] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A paper-plastic composite bag with reinforcing ribs, comprising a bag body, said bag body being composed of a paper layer and a plastic reinforcing layer, having a front, a back, and a side connecting the front and back, characterized in that: The inner surface of the side is provided with wavy rib-like protrusions extending along the height direction of the bag. The peaks and troughs of the wavy rib-like protrusions are alternately distributed along the extension direction and are integrally formed with the composite layer of the side through a co-extrusion process. The interior of the wavy rib-like protrusions is provided with a hollow channel that runs through the extension direction.

2. The paper-plastic composite bag with reinforcing ribs according to claim 1, characterized in that: The paper layer consists of a kraft paper layer and a reinforcing fiber web layer.

3. The paper-plastic composite bag with reinforcing ribs according to claim 1, characterized in that: The wavy, rib-like protrusions are distributed at non-uniform intervals along the width direction of the side.

4. The paper-plastic composite bag with reinforcing ribs according to claim 1, characterized in that: The sides are also provided with reinforcing ridges at the junctions with the front and back sides.

5. The paper-plastic composite bag with reinforcing ribs according to claim 1, characterized in that: The wavy, ribbed protrusions and the plastic layer material are a blend of polyethylene and maleic anhydride-grafted polypropylene, which are simultaneously formed through a co-extrusion process.

6. The paper-plastic composite bag with reinforcing ribs according to claim 1, characterized in that: The hollow channel with wavy, ribbed protrusions is extracted after being formed by an embedded core mold.

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