Labyrinth vented re-bag

Abstract

This utility model discloses a labyrinth-style vented heavy-duty bag, comprising a bag body. An air duct sheet is provided on the outer surface of the front panel of the bag body. The left and right sides of the air duct sheet are sealed to the front panel to form a left longitudinal sealing edge and a right longitudinal sealing edge, respectively. A longitudinal baffle for blocking powder is provided between the front panel and the air duct sheet. The front panel and the air duct sheet are separated to form several longitudinal air channels. A breathable structure is provided on the front panel. Each of the longitudinal baffles has a set of vents. At least one end of the longitudinal air channel has an exhaust port. The heavy-duty bag of this utility model can smoothly expel gas from the bag and retain powder in the air channels through the labyrinth-style venting structure, avoiding material waste and preventing environmental pollution. It is also less prone to water ingress, which could cause the material to become damp. It can be widely used in the field of heavy-duty bag processing.

Description

Technical Field

[0001] This utility model relates to the field of heavy-duty bag production and processing technology, and in particular to a labyrinth venting heavy-duty bag. Background Technology

[0002] Heavy-duty bags are widely used in industries such as chemicals and building materials for packaging powdery and granular materials. During high-speed filling, a large amount of air is drawn into the bag. If this air cannot be quickly and effectively expelled before sealing, the bag will bulge, leading to three major problems: First, the bulging bag occupies excessive storage and transportation space, significantly reducing logistics efficiency; second, it has poor stability when stacked, easily causing stack collapse accidents and posing safety hazards; third, excessively high air pressure inside the bag may cause it to rupture, resulting in product loss.

[0003] In existing technologies, directly creating vent holes on the bag body is the simplest venting method, but it causes fine powder to escape directly with the airflow, resulting in product loss and environmental pollution. While venting valves or venting channels with built-in filter material can reduce powder escape, they suffer from high costs, susceptibility to clogging, rapid failure especially in humid environments, and complex production processes. Furthermore, some labyrinth-style venting structures are not entirely well-designed, offering poor blocking effect for fine powder; and their vents are typically only located on the front and rear panels of the bag body, making them prone to water ingress and moisture absorption. Summary of the Invention

[0004] The purpose of this invention is to provide a labyrinth-style venting reusable bag to solve the related problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: It includes a bag body, comprising a front panel, a rear panel, and gusseted edges for connecting the front panel and the rear panel. An air passage panel is provided on the outer surface of the front panel. The left and right sides of the air passage panel are sealed to the front panel to form a left longitudinal sealing edge and a right longitudinal sealing edge, respectively. At least two longitudinal baffles for blocking powder are provided between the front panel and the air passage panel, and between the left and right longitudinal sealing edges. The left longitudinal sealing edge, the right longitudinal sealing edge, and each longitudinal baffle separate the front panel and the air passage panel to form several longitudinal air passages. To allow gas inside the bag to be discharged into the longitudinal airway, a set of breathable structures for guiding gas inside the bag into the leftmost longitudinal airway is provided on the front panel in the leftmost longitudinal airway section. To achieve a labyrinthine airflow path, each of the longitudinal baffles is provided with a set of vents that connect two adjacent longitudinal air passages, and the positions of the vents on two adjacent longitudinal baffles are staggered. In order to discharge gas from the longitudinal airway and prevent water from entering, at least one of the upper and lower ends of the rightmost longitudinal airway is provided with an exhaust port for discharging gas from the longitudinal airway into the bag.

[0006] Preferably, the upper and lower ends of the rightmost longitudinal air passage are provided with exhaust ports for discharging the longitudinal air passage.

[0007] To prevent the exhaust port from being heat-sealed, an anti-heat-sealing coating is provided at the exhaust port to prevent the front panel from heat-sealing with the air passage panel. The anti-heat-sealing coating is applied to the front panel or the air passage panel.

[0008] Preferably, the heat-resistant coating is an ink coating.

[0009] To facilitate air permeability while reducing powder leakage from the bag, the permeable structure consists of several micropores or several long slits.

[0010] To ensure smooth exhaust, the front panel or air passage panel is provided with a set of protruding structures that protrude longitudinally into the air passage to prevent the front panel from sticking to the air passage panel.

[0011] Preferably, the protruding structure is a protrusion on the front panel or the airway panel.

[0012] Preferably, the longitudinal guard edge is provided with two intervals.

[0013] The beneficial effects of this utility model are: 1. By setting a set of longitudinal air channels between the front panel and the air channel panel, and using staggered air vents to form a tortuous labyrinthine airflow path with each longitudinal air channel, the gas can pass through smoothly, while the powder entrained in the gas is effectively blocked and retained in the air channel by the longitudinal baffles during the process of changing direction multiple times, which fundamentally solves the problem of material escape and avoids waste and pollution.

[0014] 2. When the bag is laid flat, the vent also faces horizontally. The design of venting from the top and bottom of the bag makes it difficult for external rainwater and other liquids to flow directly into the longitudinal air channel due to gravity. This effectively reduces the risk of the material getting damp due to water entering the longitudinal air channel and improves the storage stability of the product.

[0015] 3. By setting exhaust ports at both the upper and lower ends of the rightmost longitudinal air duct, a "dual exhaust port" exhaust system is achieved. Regardless of the bag's orientation, this ensures that the air accumulated inside the bag is expelled, avoiding the problem of poor exhaust from a single outlet.

[0016] 4. The raised structures within the air passage effectively prevent the front panel and air passage panel from sticking together due to pressure or static electricity during storage and transportation, ensuring that the exhaust passage remains unobstructed. Simultaneously, these raised structures also help to block powder, further enhancing the anti-escape effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the structure of the bag body of the present invention, in which the upper and lower ends are heat-sealed, and arrow A represents the direction of gas discharge from the exhaust port.

[0019] Figure 3 This is a schematic diagram of the long strip-shaped air-permeable structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the microporous air-permeable structure in this utility model.

[0021] Figure 5 This is a schematic diagram of the structure of the heat-resistant coating in this utility model, which involves coating the rightmost longitudinal air passage.

[0022] Figure 6 This is a schematic diagram showing the position of the airway surface in Embodiment 1 of this utility model.

[0023] Figure 7 This is a schematic diagram showing the position of the airway surface in Embodiment 2 of this utility model. Detailed Implementation

[0024] Example 1, such as Figure 1-6The aforementioned labyrinthine venting heavy-duty bag includes a bag body 1, which includes a front panel 11, a rear panel 12, and two accordion-style edges 13 for connecting the front panel 11 and the rear panel 12. The outer surface of the front panel 11 is provided with an air passage surface 2 of the same height as the front panel 11. The left and right sides of the air passage surface 2 are sealed to the front panel 11 to form a left longitudinal sealing edge 3 and a right longitudinal sealing edge 4, respectively. At least two longitudinal baffles 5 for blocking powder are provided between the front panel 11 and the air passage surface 2 and between the left longitudinal sealing edge 3 and the right longitudinal sealing edge 4. The left longitudinal sealing edge 3, the right longitudinal sealing edge 4, and each longitudinal baffle 5 separate the front panel 11 and the air passage surface 2 to form a plurality of longitudinal air passages 6. The left longitudinal sealing edge 3, the right longitudinal sealing edge 4, and the longitudinal baffles 5 can be bonded together with glue during processing. The front panel 11 has a set of ventilating structures 111 located in the leftmost longitudinal airway 6 section to guide gas from the bag body into the leftmost longitudinal airway 6. Each longitudinal baffle 5 has a set of vents 51 that connect two adjacent longitudinal airways 6, and the positions of the vents 51 on adjacent longitudinal baffles 5 are staggered. At least one of the upper and lower ends of the rightmost longitudinal airway 6 is provided with an exhaust port 7 for discharging gas from the longitudinal airway 6 into the bag. This utility model utilizes the staggered arrangement of vents 51 to form a tortuous labyrinthine airflow path with each longitudinal airway 6, allowing gas to be discharged smoothly. Meanwhile, the powder entrained in the gas is effectively blocked and retained in the longitudinal airway 6 by the longitudinal baffles 5 during the process of changing direction multiple times, solving the problem of material escape and avoiding waste and pollution. Meanwhile, heavy bags containing materials are generally stored flat. In this state, the exhaust port 7 is horizontal. This structure makes it difficult for external liquids (such as rainwater) to flow into the longitudinal air passage from the exhaust port 7 due to gravity, which can effectively prevent the materials from getting damp due to water entering the longitudinal air passage 6.

[0025] In use, the bottom of the front panel 11, the gusseted edge 13, the rear panel 12, and the air passage panel 2 are heat-sealed to form a bottom transverse sealing edge 14. After the material is put into the bag, the top of the front panel 11, the rear panel 12, and the air passage panel 2 are heat-sealed to form a top transverse sealing edge 15. At the same time, it is ensured that the exhaust port 7 at the top or bottom of the rightmost longitudinal air passage 6 is not heat-sealed during heat sealing. When the bag is vented after the top and bottom ends are heat-sealed, the gas in the bag enters the leftmost longitudinal air passage 6 through the vent structure 111, then enters the middle longitudinal air passage 6 through the vent 51, then enters the rightmost longitudinal air passage 6 through the vent 51, and finally the gas is discharged from the exhaust port 7. Because the longitudinal height positions of the vents 51 on the two adjacent longitudinal baffles 5 are staggered, the powder contained in the gas discharged from the bag is retained in the longitudinal air passage 6 due to the obstruction of the longitudinal baffles 5.

[0026] To facilitate venting, both the upper and lower ends of the rightmost longitudinal air passage 6 are provided with venting ports 7 for venting the longitudinal air passage 6. Using two venting ports 7 simultaneously can improve the venting speed and venting smoothness. Moreover, regardless of whether the bag is placed upright or upside down, it can ensure that the air accumulated in the bag can be vented from the venting port 7 at one end.

[0027] To prevent the exhaust port 7 from being heat-sealed, an anti-heat-sealing coating 9 is provided at the exhaust port 7 to prevent the front panel 11 from heat-sealing with the air passage panel 2. The anti-heat-sealing coating 9 is located on the side of the front panel 11 facing the longitudinal air passage 6, or it can be located on the side of the air passage panel 2 facing the longitudinal air passage 6. The preferred embodiment of the anti-heat-sealing coating 9 is an ink coating; however, those skilled in the art will understand that any coating or treatment method capable of preventing heat sealing can be applied. Figure 1 , 2 As shown, during processing, an ink coating can be locally sprayed at exhaust port 7; as Figure 5 As shown, for ease of processing, the entire rightmost longitudinal air passage 6 section of the front panel 11 or air passage panel 2 can be coated with ink.

[0028] It should be noted that the breathable structure 111 consists of several micropores or several long slits. Both structures can achieve breathability and also prevent powder from escaping.

[0029] To prevent the front panel 11 from adhering to the air passage surface 2 and obstructing gas flow, a set of protruding structures 8 protruding towards the longitudinal air passage 6 are provided on the front panel 11 or the air passage surface 2. These protruding structures 8 support the front panel 11 and the air passage surface 2, preventing them from adhering and sealing off the longitudinal air passage 6. Preferably, the protruding structures 8 are a plurality of protrusions evenly distributed on the front panel 11 or the air passage surface 2, and these protruding structures 8 also serve to block powder.

[0030] In this embodiment, two longitudinal baffles 5 are provided at intervals. The number of longitudinal baffles 5 can be adjusted according to actual needs, but too many baffles may increase airflow resistance and affect exhaust efficiency.

[0031] Example 2, as Figure 7 The air passage panel 2 can also be disposed on the inner surface of the front panel 11. A set of ventilating structures 111 for introducing gas in the bag into the leftmost longitudinal air passage 6 is provided on the air passage panel 2 in the leftmost longitudinal air passage 6 section. Other structures and exhaust principles are the same as in Embodiment 1, and will not be repeated here. The difference is that in Embodiment 2, the gas in the bag enters the longitudinal air passage 6 from the ventilating structure 111 on the air passage panel 2 and is then discharged from the exhaust port 7.

[0032] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A maze-style vented heavy-duty bag, comprising a bag body (1), the bag body (1) comprising a front panel (11), a back panel (12), and an accordion edge (13) for connecting the front panel (11) and the back panel (12), characterized in that: The outer surface of the front panel (11) is provided with an air passage panel (2). The left and right sides of the air passage panel (2) are sealed with the front panel (11) to form a left longitudinal sealing edge (3) and a right longitudinal sealing edge (4). At least two longitudinal baffles (5) for blocking powder are provided between the front panel (11) and the air passage panel (2) and between the left longitudinal sealing edge (3) and the right longitudinal sealing edge (4). The left longitudinal sealing edge (3), the right longitudinal sealing edge (4) and each longitudinal baffle (5) separate the front panel (11) and the air passage panel (2) to form a plurality of longitudinal air passages (6). The front panel (11) is provided with a set of breathable structures (111) in the leftmost longitudinal airway (6) section for introducing gas in the bag into the leftmost longitudinal airway (6). Each of the longitudinal baffles (5) is provided with a set of air vents (51) that connect two adjacent longitudinal air passages (6), and the positions of the air vents (51) on the two adjacent longitudinal baffles (5) are staggered. At least one of the upper and lower ends of the rightmost longitudinal airway (6) is provided with an exhaust port (7) for discharging gas from the longitudinal airway (6) into the bag.

2. The labyrinth-style exhaust bag according to claim 1, characterized in that: The upper and lower ends of the rightmost longitudinal airway (6) are provided with exhaust ports (7) for discharging the longitudinal airway (6).

3. The labyrinth-style exhaust bag according to claim 1, characterized in that: The exhaust port (7) is provided with a heat-resistant coating (9) to prevent the front panel (11) from heat-sealing with the air passage panel (2). The heat-resistant coating (9) is provided on the front panel (11) or the air passage panel (2).

4. The labyrinth-style exhaust repacking bag according to claim 3, characterized in that: The heat-resistant coating (9) is an ink coating.

5. The labyrinth-style exhaust bag according to claim 1, characterized in that: The breathable structure (111) consists of a number of micropores or a number of long strip slits.

6. The labyrinth-style exhaust bag according to claim 1, characterized in that: The front panel (11) or airway panel (2) is provided with a set of protruding structures (8) that protrude toward the longitudinal airway (6) to prevent the front panel (11) from sticking to the airway panel (2).

7. The labyrinth-style exhaust repacking bag according to claim 6, characterized in that: The protruding structure (8) is a protrusion provided on the front panel (11) or the airway panel (2).

8. The labyrinth-style exhaust bag according to claim 1, characterized in that: The longitudinal guard (5) is provided with two spaced edges.

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