Novel valve bag

Abstract

The utility model discloses a novel valve bag which comprises a valve bag body. A BOPP light film is installed on the outer surface of the valve bag body, a valve port is formed in one end of the valve bag body, a kraft paper layer is installed in the valve bag body, a plurality of air holes are formed in the side face of the kraft paper layer, the inner wall of the valve bag body is coated with a PE film, a plurality of micro holes are formed in the side face of the PE film, and symmetrical receding cavities are formed in the bottom of the PE film. A non-woven fabric layer is mounted at one end of the abdicating cavity; the kraft paper layer, the PE film and the like are arranged, when powdery materials are filled, air entering the PE film through the materials is exhausted into the interlayer in the valve bag body from the micro holes and exhausted from the air holes in the kraft paper layer, the air holes and the micro holes are arranged in a staggered mode, exhausting is facilitated, meanwhile, the materials can be effectively prevented from being scattered, and the service life of the valve bag is prolonged. The non-woven fabric layer is arranged at the bottom of the valve bag body to block materials, the air displacement is increased through the through holes in the bottom, and the overall air exhaust function of the valve bag body is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valve bags, in particular to a novel valve bag. Background Art

[0002] Valve bags, commonly known as paste-bottom bags, are a type of packaging bag that is currently popular internationally. Their main features include improved packaging efficiency, convenient transportation, strong firmness, low breakage rate, and they are environmentally friendly packaging bags. The design of the valve bag allows for feeding from the top or bottom valve port and is operated using specialized filling equipment. After filling, a square shape is formed that is both beautiful and easy to stack. The valve bag itself needs to have a certain degree of air permeability to ensure that the material remains dry during storage and transportation. The air permeability design of the valve bag is usually achieved through tiny pores or special material layers. These pores or material layers can prevent powdered materials from spilling out of the bag while maintaining air circulation inside and outside the bag.

[0003] Some existing valve bags need to have some vent holes in the valve bags during filling and storage. However, the valve bags with vent holes may spill when the powdered materials are filled. Without vent holes, the gas accumulated in the materials is difficult to discharge smoothly, which affects the long-term storage quality and retrieval efficiency of the materials and reduces the applicability of the valve bags. Therefore, a new type of valve bag is needed to meet people's needs. Utility Model Content

[0004] The purpose of the present invention is to provide a new valve bag to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a novel valve bag, comprising a valve bag body; a BOPP glossy film is installed on the outer surface of the valve bag body; a valve port is formed at one end of the valve bag body; a kraft paper layer is installed inside the valve bag body; a side surface of the kraft paper layer has a plurality of air holes; an inner wall of the valve bag body is coated with a PE film; a side surface of the PE film has a plurality of micro-holes; a symmetrical clearance cavity is formed at the bottom of the PE film; a non-woven fabric layer is installed at one end of the clearance cavity;

[0006] Preferably, a plurality of perforations are provided at the bottom of the valve bag body, and a non-woven fabric layer is provided at one end of the perforations.

[0007] Preferably, a symmetrical plastic sheet is installed in the valve port, and a hot melt adhesive coating is installed on one end of the plastic sheet.

[0008] Preferably, both ends of the valve port are bonded to the valve bag body, and one end of the valve port is adapted to the kraft paper layer.

[0009] Preferably, the kraft paper layer is arranged in the inner interlayer of the valve bag body, and the PE film is arranged on the inner wall of the valve bag body.

[0010] Preferably, the non-woven fabric layer is installed at the bottom of the valve bag body, both ends of the non-woven fabric layer are installed in the clearance cavity, and the non-woven fabric layer is adapted to the perforations.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] (1) The utility model provides a kraft paper layer and a PE film, etc., so that when filling powdered materials, the air that enters the PE film through the material is discharged from the micro holes into the interlayer of the valve bag body, and is discharged from the air holes on the kraft paper layer. The air holes and the micro holes are staggered, which helps to exhaust the air and effectively prevents the material from spilling. A non-woven fabric layer is provided at the bottom of the valve bag body to block the material, and the exhaust volume is increased through the perforations at the bottom, thereby improving the overall exhaust function of the valve bag body.

[0013] (2) The utility model provides a plastic sheet and a hot melt adhesive coating. When the material pipe is inserted into the spray bag from the valve port, the gas in the valve bag body is discharged. When the gas flows out, the two plastic sheets in the valve port are driven to squeeze toward the material pipe, which can cover the side of the material pipe and help to better fill the material without spilling. When the material filling is completed, the hot melt adhesive coating can close the opening more quickly, preventing the valve bag body from spilling during the moving sealing process, thereby improving the applicability of the valve bag body. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the three-dimensional structure of a new valve bag proposed in the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the BOPP glossy film and kraft paper layer of a new type of valve bag proposed in the utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the kraft paper layer and PE film of a new valve bag proposed in the utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the non-woven fabric layer and the give way cavity of a new valve bag proposed in the utility model;

[0018] Figure 5 for Figure 2 Enlarged view of point A.

[0019] In the figure: 1. Valve bag body; 2. BOPP bright film; 3. Valve opening; 4. Kraft paper layer; 5. Vent hole; 6. PE film; 7. Micro hole; 8. Non-woven fabric layer; 9. Perforation; 10. Plastic sheet; 11. Hot melt adhesive coating; 12. Relief cavity. Specific embodiments

[0020] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0021] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Embodiment 1: Please refer to Figures 1-5, the present utility model provides a technical solution: a new type of valve bag, including a valve bag body 1; a BOPP bright film 2 is installed on the outer surface of the valve bag body 1, a valve opening 3 is provided at one end of the valve bag body 1, a kraft paper layer 4 is installed inside the valve bag body 1, a plurality of air holes 5 are provided on the side of the kraft paper layer 4, a PE film 6 is coated on the inner wall of the valve bag body 1, a plurality of micro holes 7 are provided on the side of the PE film 6, symmetrically arranged relief cavities 12 are provided at the bottom of the PE film 6, a non-woven fabric layer 8 is installed at one end of the relief cavity 12, a plurality of through holes 9 are provided at the bottom of the valve bag body 1, a non-woven fabric layer 8 is provided at one end of the through hole 9, both ends of the valve opening 3 are bonded inside the valve bag body 1, one end of the valve opening 3 is adapted to the kraft paper layer 4, the kraft paper layer 4 is arranged in the inner sandwich of the valve bag body 1, the PE film 6 is arranged on the inner wall of the valve bag body 1, the non-woven fabric layer 8 is installed at the bottom of the valve bag body 1, both ends of the non-woven fabric layer 8 are installed in the relief cavity 12, the non-woven fabric layer 8 is adapted to the through hole 9, the air inside the PE film 6 is squeezed by the entering material, and part of the gas is discharged into the inner sandwich of the valve bag body 1 through the micro holes 7. When the gas is discharged into the sandwich, it is discharged through the air holes 5 on the kraft paper layer 4. The air holes 5 on the kraft paper layer 4 and the micro holes 7 on the PE film 6 are arranged in a staggered manner, which can effectively prevent the material from spilling while helping to exhaust the air. The non-woven fabric layer 8 is provided at the bottom of the valve bag body 1 to block the material and has a certain air permeability, and the exhaust volume is increased by the plurality of through holes 9 provided at the bottom, improving the overall exhaust function of the valve bag body 1. The moisture-proof ability of the valve bag body 1 is improved by the laminated kraft paper layer 4 and PE film 6.

[0024] Example 2: As Figure 2 and 5 shown, symmetric plastic sheets 10 are installed inside the valve opening 3, and a hot melt adhesive coating 11 is installed at one end of the plastic sheet 10. When the material pipe is put into the valve bag body 1 through the valve opening 3 and the valve bag body 1 is filled with material, the two plastic sheets 10 at the valve opening 3 are driven by the airflow to float and stick to the side of the material pipe, which can effectively prevent the material from spilling when filling the material. After the material filling is completed, the opening can be closed more quickly through the hot melt adhesive coating 11, preventing the problem of material spilling during the process of moving and sealing the valve bag body 1. The other features are the same as those in Example 1.

[0025] The working principle is as follows: The material pipe is placed into the valve bag body 1 through the valve opening 3. When filling the valve bag body 1 with materials, the air entering the extrusion PE film 6 by the materials causes part of the gas to be discharged into the inner layer of the valve bag body 1 through the micro holes 7. The airflow drives the two plastic sheets 10 at the valve opening 3 to float and stick to the side of the material pipe, effectively preventing the materials from spilling when filling. When the gas is discharged into the inner layer, it is discharged through the ventilation holes 5 on the kraft paper layer 4. The ventilation holes 5 on the kraft paper layer 4 and the micro holes 7 on the PE film 6 are arranged in a staggered manner, effectively preventing the materials from spilling while helping to exhaust the gas. The bottom of the valve bag body 1 is provided with a non-woven fabric layer 8 to block the materials and has certain air permeability. The exhaust volume is increased by multiple perforations 9 opened at the bottom, enhancing the overall exhaust function of the valve bag body 1. The moisture-proof ability of the valve bag body 1 is improved by the laminated kraft paper layer 4 and PE film 6. After the material filling is completed, the opening can be sealed faster through the hot melt adhesive coating 11, preventing the materials from spilling during the process of moving and sealing the valve bag body 1, and improving the applicability of the valve bag body 1.

[0026] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new type of valve bag, comprising a valve bag body (1); characterized in that: A BOPP bright film (2) is installed on the outer surface of the valve bag body (1). A valve opening (3) is provided at one end of the valve bag body (1). A kraft paper layer (4) is installed inside the valve bag body (1). A plurality of air holes (5) are provided on the side surface of the kraft paper layer (4). A PE film (6) is coated on the inner wall of the valve bag body (1). A plurality of micro holes (7) are provided on the side surface of the PE film (6). Symmetrical relief cavities (12) are provided at the bottom of the PE film (6). A non-woven fabric layer (8) is installed at one end of the relief cavity (12).

2. A novel valve bag according to claim 1, characterized in that: A plurality of through holes (9) are provided at the bottom of the valve bag body (1). A non-woven fabric layer (8) is provided at one end of the through hole (9).

3. A novel valve bag according to claim 1, characterized in that: Symmetrical plastic sheets (10) are installed inside the valve opening (3). A hot melt adhesive coating (11) is installed at one end of the plastic sheet (10).

4. A novel valve bag according to claim 1, characterized in that: Both ends of the valve opening (3) are bonded inside the valve bag body (1). One end of the valve opening (3) is adapted to the kraft paper layer (4).

5. A novel valve bag according to claim 1, wherein: The kraft paper layer (4) is arranged in the inner sandwich layer of the valve bag body (1). The PE film (6) is arranged on the inner wall of the valve bag body (1).

6. The novel valve bag according to claim 2, wherein: The non-woven fabric layer (8) is installed at the bottom of the valve bag body (1). Both ends of the non-woven fabric layer (8) are installed inside the relief cavity (12). The non-woven fabric layer (8) is adapted to the through hole (9).

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