A type of exhaust valve packaging bag

Abstract

This invention relates to the field of filling and packaging technology, and discloses a venting valve-type packaging bag, solving the current technical problem of how to achieve rapid venting of packaging bags while simultaneously meeting the requirements of moisture-proof performance and bag strength. The bag includes a cylindrical body and a filling valve. The middle part of the cylindrical body forms the bag body. The bottom of the cylindrical body forms an upper bottom through a sealing process. The top of the cylindrical body forms a lower bottom through a sealing process. One or both of the upper and lower bottoms have breathable patches attached to their inner sides. One side of the breathable patch installed at the upper bottom is sealed to the upper bottom, while the other side forms an venting channel to the outside. Similarly, one side of the breathable patch installed at the lower bottom is sealed to the lower bottom, while the other side also forms an venting channel to the outside. According to the above technical solution, this invention utilizes the breathable patches to form venting channels with the outside, achieving good breathability while maintaining both moisture-proof performance and bag strength.

Description

Technical Field

[0001] This invention relates to the field of filling and packaging technology, and more specifically, to a vented valve-type packaging bag. Background Technology

[0002] Valve-filled bags consist of three parts: the bag body, upper and lower bottom sections, and the valve opening. The valve opening is located on one side of the upper and lower bottom section. During the filling process, the valve tube of the filling machine is inserted into the valve opening of the bag, and the material is filled using pneumatic conveying, screw conveying, or impeller conveying. Afterward, the valve opening is closed by heat sealing, and the gas inside the bag is expelled through the bag's own permeability, thus compacting and shaping the material. Valve-filled bags offer high filling efficiency, excellent bag sealing performance, aesthetically pleasing single-bag and pallet stacking, and convenient transportation. They are widely used in industrial production for packaging various powders or granules.

[0003] Valve-sealed packaging bags have varying requirements for air permeability, moisture resistance, and bag strength depending on the material's state and the industry. For example, in packaging granular materials, the material itself has a lower air content, resulting in a lower air content inside the bag during packaging and after sealing. In this case, standard paper or film can be used without perforation, satisfying the material packaging needs while minimizing impact on the bag's overall moisture resistance and strength due to the absence of perforations.

[0004] For packaging hygroscopic ultrafine powders in industries such as specialty chemicals, food, and pharmaceuticals, the high gas content of the material itself means that a large amount of conveying gas would be injected during the filling process if pneumatic filling is used. Therefore, achieving sufficient air permeability in the packaging bag to allow for rapid air release and prevent issues like bag bursting or excessively long filling times, while minimizing the impact on the bag's moisture-proof performance and strength, is of great importance and requires improvement. Summary of the Invention

[0005] In response to the technical problem mentioned in the background art of how to achieve rapid air venting of packaging bags while simultaneously satisfying the moisture-proof performance and bag strength of the packaging bags, the present invention utilizes a breathable patch to form an air venting channel with the outside world, so as to achieve good air permeability while taking into account the moisture-proof performance and bag strength of the packaging bags.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A vented valve-type packaging bag, comprising a cylindrical body and a filling valve;

[0008] The middle part of the cylinder is the bag body;

[0009] The bottom of the cylinder is formed into an upper bottom through a paste-bottom process;

[0010] The bottom of the cylinder is formed by a paste-bottom process at the top.

[0011] The bottom is sealed with a first patch by adhesive, the top is sealed with a second patch by adhesive and one end of the second patch is sealed together, and the other end of the top is fitted with the filling valve, which is connected to the inside of the bag body.

[0012] One or both of the upper and lower soles have breathable patches attached to their inner sides. The breathable patch installed on the upper sole has one side sealed to the upper sole and the other side forms an exhaust channel to the outside. The breathable patch installed on the lower sole has one side sealed to the lower sole and the other side also forms an exhaust channel to the outside.

[0013] The above-mentioned technical solutions, such as valve-mouth packaging bags with single or multiple layers, use breathable paper for one or more layers or perforate one or more layers of the material, which is the main way to achieve air venting in existing packaging bags. However, although the use of breathable paper alone meets the air permeability requirements of the packaging bag, it cannot meet the requirements for moisture protection and packaging bag strength.

[0014] Therefore, for materials requiring high air permeability and moisture resistance, multi-layer packaging bag structures of 2 layers of paper and 1 layer of film or 3 layers of paper and 1 layer of film are generally used to achieve the strength, air permeability, and moisture resistance of the packaging bag. The use of paper achieves the air permeability requirement of the packaging bag, while the use of the film layer can effectively improve the moisture resistance of the packaging bag. At the same time, the inner or outer layers of paper and film of the packaging bag are perforated. The number and diameter of the perforations are used to control the balance between the air permeability, moisture resistance, and strength of the packaging bag.

[0015] For multi-layer packaging bags with a 2-paper-1-film or 3-paper-1-film structure, although perforation of the bag body can balance the air permeability, moisture-proof performance and strength of the packaging bag by the number and diameter of perforations, perforation, especially of the film, will not only lead to a significant loss of packaging bag strength, but also a significant decrease in moisture-proof performance. This will not only cause material to leak from the perforated area, but also affect the aesthetics of the packaging bag.

[0016] The present invention is further configured such that the breathable patch is a single-layer sheet structure.

[0017] Through the above technical solution, the breathable patch mainly plays the role of sealing and venting at both ends of the bag body. Therefore, according to the specific packaging material needs and the selection of breathable patch material, a reasonable number of layers can be set, and a single-layer or multi-layer structure can be set.

[0018] The present invention is further configured such that the breathable patch is a multi-layer sheet or tubular structure.

[0019] Through the above technical solution, the breathable patch mainly plays the role of sealing and venting at both ends of the bag body. Therefore, according to the specific packaging material needs and the selection of breathable patch material, a reasonable number of layers can be set, and a single-layer or multi-layer structure can be set. Among them, the multi-layer structure can be a cylindrical structure.

[0020] The present invention is further configured such that: the width of the breathable patch is greater than the bottom width of the upper / lower bottom, and the folded inner layer of the breathable patch overlaps with the front / back cover of the upper / lower bottom and is sealed and bonded by adhesive.

[0021] By utilizing the above technical solution and the folded inner layer, the installation firmness of the breathable patch can be improved.

[0022] The present invention is further configured such that: at least one side of the breathable patch parallel to the upper / lower bottom direction overlaps with the triangular area of ​​the upper / lower bottom; the inner layer of the breathable patch is bonded and sealed to the triangular area with adhesive; the outer layer of the breathable patch parallel to the other side of the upper / lower bottom direction is bonded and sealed to the upper / lower bottom or the other side of the triangular area; the breathable patch and the bottom perimeter form a sealed structure, satisfying the requirement that the bottom forms a closed structure with the outside.

[0023] The invention is further configured such that the exhaust channel is located at the bottom of the filling valve port, or at the bottom of the non-valve port side, or at both bottoms.

[0024] The present invention is further configured such that the breathable patch is paper, perforated metal foil or film, non-woven fabric and other breathable composite materials.

[0025] The invention is further configured such that the upper / lower bottom triangular area is bonded to the outer side of the front and rear cover surfaces with adhesive to improve the strength of the upper / lower bottom. The upper / lower bottom triangular area, the front and rear cover surfaces, and other areas of the breathable patch are not bonded with adhesive, so that the breathable patch, the upper / lower bottom triangular area, and the upper / lower bottom form an exhaust channel. Gas inside the packaging bag can enter the exhaust channel through the breathable patch to complete the exhaust.

[0026] In summary, the present invention has the following beneficial effects:

[0027] This invention achieves bottom venting by applying breathable material and designing venting channels to the valve end (top bottom) or bottom end (bottom bottom) of the valve-mouth packaging bag. This avoids the problems of insufficient moisture-proof performance and low packaging strength caused by perforation of the bag body. At the same time, since the breathable material and venting channel design are located inside the bag body, the aesthetics of the packaging bag are effectively avoided due to the venting design. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the valve port packaging bag structure with an exhaust channel in Example 1;

[0029] Figure 2 This is a schematic diagram of the valve port packaging bag structure with an exhaust channel in Example 2.

[0030] Reference numerals in the attached diagram: 1. Cylinder; 2. Filling valve; 3. Bag body; 4. Top bottom; 5. Bottom bottom; 5-1. First cover; 5-2. Rear cover; 8. Breathable patch; 9. Exhaust channel; 10. Triangular area; 11-1. First adhesive strip; 11-2. Second adhesive strip; 11-3. Third adhesive strip; 11-4. Fourth adhesive strip. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0032] Example 1

[0033] A type of venting valve packaging bag, such as Figure 1 As shown, the bag includes a cylinder 1 and a filling valve 2. The middle part of the cylinder 1 is the bag body 3. The bottom of the cylinder 1 is formed into an upper bottom 4 by a bottom-gluing process, and the top of the cylinder 1 is formed into a lower bottom 5 by a bottom-gluing process. Both the upper bottom 4 and the lower bottom 5 include a first cover 5-1 and a second cover 5-2. The first cover 5-1 and the second cover 5-2 are sealed together by a continuous first adhesive strip 11-1 and a second adhesive strip 11-2. The cover overlaps with the triangular area 10 in the direction parallel to the bottom of the valve. The inner side of the cover is sealed together with the triangular area 10 by a third adhesive strip 11-3. The lower bottom 5 is sealed with a first patch by adhesive. The upper bottom 4 is sealed with a second patch by adhesive, and one end of the second patch is sealed together. The other end of the upper bottom 4 is equipped with the filling valve 2, which is connected to the inside of the bag body 3.

[0034] A breathable patch 8 is attached to the inner side of the upper sole 4. The outer side of the other side of the breathable patch 8 is sealed by a fourth adhesive strip 11-4. The first adhesive strip 11-1, the second adhesive strip 11-2, the third adhesive strip 11-3, and the fourth adhesive strip 11-4 form a closed bond to achieve a sealed structure between the breathable patch 8 and the upper sole 4, while also creating an air venting channel 9 for the breathable patch 8 to the outside. Specifically, the bottom triangular area 10, the top cover 5-1, and the back cover 5-2 are not glued to other areas of the breathable material 7 to form the air venting channel 9.

[0035] During the filling process, gas inside the packaging bag can enter the exhaust channel 9 through the breathable patch 8 and be discharged, thus achieving venting of the packaging bag. In this embodiment, the breathable patch 8 is a single-layer sheet structure, and the breathable patch 8 is made of paper, perforated metal foil or film, non-woven fabric, or other breathable composite materials. In other embodiments, the breathable patch 8 can also be a multi-layer sheet or tubular structure.

[0036] The width of the breathable patch 8 is greater than the bottom width of the upper sole 4. The folded inner layer of the breathable patch 8 overlaps with the first cover surface 5-1 and the back cover surface 5-2 of the upper sole 4 and is sealed with adhesive.

[0037] The breathable patch 8 overlaps with the triangular area 10 of the upper sole 4 on at least one side parallel to the direction of the upper sole 4. The inner layer of the breathable patch 8 is bonded and sealed to the triangular area 10 with adhesive. The outer layer of the breathable patch 8 on the other side parallel to the direction of the upper sole 4 is bonded and sealed to the upper sole 4 or the triangular area 10 on the other side. The breathable patch 8 and the bottom perimeter form a sealed structure, satisfying the requirement that the bottom and the outside are closed.

[0038] The triangular area 10 is glued to the outer sides of the first cover 5-1 and the back cover 5-2 to improve the strength of the upper sole 4. The triangular area 10, the first cover 5-1, the back cover 5-2 and other areas of the breathable patch 8 are not glued together so that the breathable patch 8, the triangular area 10 and the upper sole 4 form an exhaust channel. Gas inside the packaging bag can enter the exhaust channel 9 through the breathable patch 8 to complete the exhaust.

[0039] Example 2

[0040] A type of venting valve packaging bag, such as Figure 2 As shown, the bag includes a cylinder 1 and a filling valve 2. The middle part of the cylinder 1 is the bag body 3. The bottom of the cylinder 1 is formed into an upper bottom 4 by a bottom-gluing process, and the top of the cylinder 1 is formed into a lower bottom 5 by a bottom-gluing process. Both the upper bottom 4 and the lower bottom 5 include a first cover 5-1 and a second cover 5-2. The first cover 5-1 and the second cover 5-2 are sealed together by a continuous first adhesive strip 11-1 and a second adhesive strip 11-2. The cover overlaps with the triangular area 10 in the direction parallel to the bottom of the valve. The inner side of the cover is sealed together with the triangular area 10 by a third adhesive strip 11-3. The lower bottom 5 is sealed with a first patch by adhesive. The upper bottom 4 is sealed with a second patch by adhesive, and one end of the second patch is sealed together. The other end of the upper bottom 4 is equipped with the filling valve 2, which is connected to the inside of the bag body 3.

[0041] A breathable patch 8 is attached to the inner side of the upper sole 4. The outer side of the other side of the breathable patch 8 is sealed by a fourth adhesive strip 11-4. The first adhesive strip 11-1, the second adhesive strip 11-2, the third adhesive strip 11-3, and the fourth adhesive strip 11-4 form a closed bond to achieve a sealed structure between the breathable patch 8 and the upper sole 4, while also creating an air venting channel 9 for the breathable patch 8 to the outside. Specifically, the bottom triangular area 10, the top cover 5-1, and the back cover 5-2 are not glued to other areas of the breathable material 7 to form the air venting channel 9.

[0042] In this process, the length of the patch 8 in the direction parallel to the upper bottom 4 is extended to overlap with the triangular areas 10 on both sides. The inner layer of the breathable patch 8 on the valve port side is bonded to the outer layer of the filling valve port 2 by the fourth adhesive strip 11-4, so as to achieve a closed bonding of the first adhesive strip 11-1, the second adhesive strip 11-2, the third adhesive strip 11-3 and the fourth adhesive strip 11-4. The second patch, the first cover surface 5-1, the rear cover surface 5-2 on the outer side of the upper bottom 4 and the breathable patch 8 are not bonded with other adhesives in the triangular area on at least one side, so as to form an exhaust channel 11.

[0043] Example 3

[0044] A venting valve-type packaging bag has a breathable patch 8 installed at the bottom of the non-filling valve port 2, i.e., installed on the bottom 5. The other structures are the same as in Embodiment 1 or Embodiment 2.

[0045] Example 4

[0046] A type of venting valve-type packaging bag has a breathable patch 8 installed on both the filling valve port 2 side and the non-filling valve port 2 side, that is, a breathable patch 8 is installed on both the upper bottom 4 and the lower bottom 5. Other structures are the same as in Example 1 or Example 2.

[0047] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A vented valve-type packaging bag, comprising a cylindrical body (1) and a filling valve (2); The middle part of the cylindrical body (1) is the bag body (3); The bottom of the cylinder (1) is formed into an upper bottom (4) by a paste-bottom process. The bottom (5) of the top of the cylinder (1) is formed by a paste-bottom process. The bottom (5) is sealed with a first patch by adhesive, the top (4) is sealed with a second patch by adhesive and is sealed with one end of the second patch, and the other end of the top (4) is fitted with the filling valve (2), which is connected to the inside of the bag body (3). Its features are: One or both of the upper sole (4) and the lower sole (5) are fitted with breathable patches (8). The breathable patch (8) installed on the upper sole (4) is sealed to the upper sole (4) on one side and forms an exhaust channel (9) to the outside on the other side. The breathable patch (8) installed on the lower sole (5) is sealed to the lower sole (5) on one side and forms an exhaust channel (9) to the outside on the other side. The width of the breathable patch (8) is greater than the bottom width of the upper bottom (4) / lower bottom (5). The folded inner layer of the breathable patch (8) overlaps with the front / back cover of the upper bottom (4) / lower bottom (5) and is sealed with adhesive. The breathable patch (8) overlaps with the triangular area of ​​the upper bottom (4) / lower bottom (5) on at least one side parallel to the direction of the upper bottom (4) / lower bottom (5). The inner layer of the breathable patch (8) is bonded to the triangular area with glue and sealed. The outer layer of the breathable patch (8) on the other side parallel to the direction of the upper bottom (4) / lower bottom (5) is bonded to the upper bottom (4) / lower bottom (5) or the triangular area on the other side and sealed. The breathable patch (8) and the bottom perimeter form a sealed structure, satisfying the requirement that the bottom and the outside are closed. The exhaust channel (9) is located at the bottom of the filling valve port (2), or it can be located at the bottom of the non-valve port side, or at both bottoms.

2. The venting valve packaging bag according to claim 1, characterized in that: The breathable patch (8) has a single-layer sheet structure.

3. The venting valve-type packaging bag according to claim 1, characterized in that: The breathable patch (8) has a multi-layer sheet or tubular structure.

4. The venting valve-type packaging bag according to claim 1, characterized in that: The breathable patch (8) is made of paper, perforated metal foil or film, non-woven fabric or other breathable composite materials.

5. The venting valve packaging bag according to claim 1, characterized in that: The triangular area of ​​the upper bottom (4) / lower bottom (5) is glued to the outer side of the front and rear cover surfaces to improve the strength of the upper bottom (4) / lower bottom (5). The triangular area of ​​the upper bottom (4) / lower bottom (5), the front and rear cover surfaces and other areas of the breathable patch (8) are not glued together so that the breathable patch (8), the triangular area of ​​the upper bottom (4) / lower bottom (5) and the upper bottom (4) / lower bottom (5) form an exhaust channel. The gas inside the packaging bag can enter the exhaust channel (9) through the breathable patch (8) to complete the exhaust.

Images