Powder packaging bag with labyrinth exhaust structure

Abstract

The utility model discloses a powder packaging bag with labyrinth exhaust structure, including the bag body, the left front sheet lap of bag body is on the right front sheet, the left front sheet right side edge is sealed with the right front sheet and forms the right longitudinal seal edge, the left side edge of right front sheet is sealed with left front sheet and forms the left longitudinal seal edge, be provided with longitudinal baffle for blocking powder between left longitudinal seal edge and right longitudinal seal edge, the overlapping interval of left front sheet and right front sheet is separated and forms a plurality of longitudinal air passage with longitudinal baffle, be provided with breathable structure on right front sheet, be provided with the air vent on longitudinal baffle, be provided with the exhaust port on right longitudinal seal edge. The utility model discloses the heavy bag can smoothly discharge the gas in the bag, and the powder is detained in the air passage through the labyrinth exhaust structure, avoids material waste, prevents the pollution environment, and simultaneously still not easy to make material damp with water, can be widely applied in heavy bag processing field.

Description

Technical Field

[0001] This utility model relates to the field of heavy-duty bag production and processing technology, and in particular to a powder packaging bag with a labyrinth-type venting structure. 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 this causes fine powder to escape directly with the airflow, resulting in product loss and environmental pollution. While venting valves or 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 and are ineffective at blocking fine powder; moreover, when bags containing powder are stacked flat, the vents face upwards, allowing rainwater and other moisture to easily flow into the bag body, causing the powder to become damp. Summary of the Invention

[0004] The purpose of this invention is to provide a powder packaging bag with a labyrinthine venting structure 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 rear panel formed by folding a sheet film, two gusseted edges connected to both sides of the rear panel, a left front panel and a right front panel connected to the two gusseted edges, the left front panel overlapping the outer surface of the right front panel, the right side of the left front panel sealing the right front panel to form a right longitudinal sealing edge, the left side of the right front panel sealing the left front panel to form a left longitudinal sealing edge, a longitudinal baffle for blocking powder is provided between the left and right longitudinal sealing edges, and the left, right, and longitudinal baffles divide the overlapping area of ​​the left and right front panels to form several longitudinal air channels; 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 left longitudinal airway is provided on the right front panel within the left longitudinal airway section. To connect the longitudinal air passages to each other, the longitudinal baffle is provided with an air vent that connects two adjacent longitudinal air passages. To allow gas to be discharged from the longitudinal air passage while preventing water from entering, an exhaust port is provided on the right longitudinal sealing edge to discharge gas from the longitudinal air passage into the bag body. The exhaust port and the air inlet are staggered.

[0006] Preferably, two exhaust ports are provided on the right longitudinal sealing edge, and the two exhaust ports are respectively located near the upper and lower ends of the bag body.

[0007] To facilitate air permeability while reducing powder leakage from the bag, the permeable structure consists of several micropores or several long slits.

[0008] To ensure smooth exhaust, the left or right front panel is provided with a set of protruding structures that extend longitudinally into the air passage to prevent the left and right front panels from sticking together.

[0009] Preferably, the protruding structure is a convex bulge provided on the left or right front panel.

[0010] Preferably, at least two longitudinal baffles are provided, the positions of the vents on two adjacent longitudinal baffles are staggered, and the positions of the vent and exhaust port on the rightmost longitudinal baffle are staggered.

[0011] The beneficial effects of this utility model are: 1. By setting a set of longitudinal air channels between the left and right front panels, and using staggered air inlets and outlets and longitudinal air channels to form a tortuous labyrinthine airflow path, the gas can pass through smoothly, while the powder entrained in the gas is effectively blocked and retained in the air channels 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.

[0012] 2. When the bag is laid flat, the vent also faces horizontally, making it less likely for external rainwater or other liquids to flow directly into the longitudinal air passage due to gravity. This effectively reduces the risk of the material becoming damp due to water entering the longitudinal air passage and improves the storage stability of the product.

[0013] 3. By setting vents at both the top and bottom of the bag, a "dual vent" venting system is achieved, resulting in high venting efficiency. Regardless of the bag's orientation (vertical or upside down), it ensures that any air accumulated inside the bag is expelled through at least one vent, avoiding the problem of poor venting from a single opening.

[0014] 4. The raised structure within the air passage effectively prevents 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, the raised structure also helps to block powder, further enhancing the anti-escape effect. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the structure of the bag body described in this utility model.

[0016] Figure 2 This is the front view of Embodiment 1 of this utility model.

[0017] Figure 3 This is a front view of the bag body after the upper and lower ends are heat-sealed, as described in Embodiment 1 of this utility model.

[0018] Figure 4 This is a schematic diagram of the long strip-shaped breathable structure of this utility model. Figure 5 This is a schematic diagram of the microporous air-permeable structure in this utility model.

[0019] Figure 6 This is a right view of the exhaust port in an embodiment of this utility model.

[0020] Figure 7 This is a front view of the bag body after the upper and lower ends are heat-sealed, as described in Embodiment 2 of this utility model. Detailed Implementation

[0021] Example 1, such as Figure 1-6The powder packaging bag with a labyrinthine venting structure includes a bag body, the bag body including a back sheet 1 formed by folding a sheet film, two accordion edges 2 connected to both sides of the back sheet 1, a left front sheet 3 and a right front sheet 4 connected to the two accordion edges 2, the left front sheet 3 overlapping the outer surface of the right front sheet 4. The right side of the left front panel 3 is sealed with the right front panel 4 to form a right longitudinal sealing edge 31, and the left side of the right front panel 4 is sealed with the left front panel 3 to form a left longitudinal sealing edge 41. A longitudinal baffle 5 for blocking powder is provided between the left longitudinal sealing edge 41 and the right longitudinal sealing edge 31. The left longitudinal sealing edge 41, the right longitudinal sealing edge 31 and the longitudinal baffle 5 divide the overlapping area of ​​the left front panel 3 and the right front panel 4 to form a plurality of longitudinal air channels 6. The left longitudinal sealing edge 41, the right longitudinal sealing edge 31 and the longitudinal baffle 5 can be bonded together with glue during processing. A set of venting structures 42 for introducing gas in the bag into the left longitudinal air channel 6 is provided on the right front panel 4 within the left longitudinal air channel 6 area. A vent 51 is provided on the longitudinal baffle 5 to connect two adjacent longitudinal air channels 6. An exhaust port 7 is provided on the right longitudinal sealing edge 31 to discharge gas in the longitudinal air channel 6 into the bag. The exhaust port 7 and the vent 51 are staggered. This invention utilizes a staggered arrangement of vents 51, exhaust ports 7, and longitudinal air channels 6 to create a tortuous, labyrinthine airflow path. Gas can be smoothly discharged, while powder entrained in the gas is effectively blocked and retained within the longitudinal air channels 6 by the longitudinal baffles 5 as the airflow direction changes. This solves the problem of material leakage and avoids waste and contamination. Simultaneously, since the heavy bags containing materials are generally stored flat, the exhaust ports 7 are horizontal. This structure prevents external liquids (such as rainwater) from flowing into the longitudinal air channels 6 due to gravity, effectively preventing water from entering the longitudinal air channels 6 and causing the materials to become damp.

[0022] In use, the bottom of the rear panel 1, the gusseted edge 2, the left front panel 3, and the right front panel 4 are heat-sealed to form a bottom transverse sealing edge 10. After the material is placed into the bag, the top of the rear panel 1, the gusseted edge 2, the left front panel 3, and the right front panel 4 are heat-sealed to form a top longitudinal sealing edge 20. After the top and bottom ends are heat-sealed, when venting, the gas inside the bag enters the leftmost longitudinal air passage 6 through the vent structure 42, then enters the right 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 vent 51 and the exhaust port 7 are staggered, the powder contained in the gas discharged from the bag is retained in the longitudinal air passage 6 by the blocking effect of the longitudinal baffle 5 and the right longitudinal sealing edge 31.

[0023] To facilitate venting, two vents 7 are provided on the right longitudinal sealing edge 31. The two vents 7 are respectively located near the upper and lower ends of the bag body. Using two vents 7 simultaneously can improve the venting speed and smoothness, and ensure that the air accumulated in the bag body can be discharged from the vent 7 at one end, regardless of whether the bag body is placed upright or upside down. When using glue to bond the right side of the left front panel 3 to the right front panel 4 to form the right longitudinal sealing edge 31, no glue needs to be applied at the vents 7 to form the vents 7 on the right longitudinal sealing edge 31.

[0024] It should be noted that the breathable structure 42 consists of several micropores or several long slits. Both structures can achieve breathability and also prevent powder from escaping.

[0025] To prevent the left front panel 3 and right front panel 4 from sticking together and obstructing gas flow, a set of protruding structures 8 are provided on the left front panel 3 or right front panel 4, protruding towards the longitudinal air passage 6 to prevent the left front panel 3 and right front panel 4 from sticking together. The protruding structures 8 are supported between the left front panel 3 and right front panel 4, preventing them from sticking together and blocking the longitudinal air passage 6. Preferably, the protruding structures 8 are a plurality of protrusions evenly distributed on the left front panel 3 or right front panel 4, and the protruding structures 8 can also block powder.

[0026] Example 2: As Figure 7 As shown, at least two longitudinal baffles 5 are provided. The positions of the vents 51 on adjacent longitudinal baffles 5 are staggered, and the positions of the vent 51 on the rightmost longitudinal baffle 5 and the exhaust port 7 are staggered. Other structures and exhaust principles are the same as in Embodiment 1, and will not be repeated here. In this embodiment, two or more longitudinal baffles 5 can be provided at intervals. The number of longitudinal baffles 5 can be adjusted according to actual needs. It is preferable to provide two; providing too many may increase airflow resistance and affect exhaust efficiency.

[0027] 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 powder packaging bag with a labyrinthine venting structure, characterized in that: The bag includes a back panel (1) formed by folding a film, gusseted edges (2) connected to both sides of the back panel (1), a left front panel (3) and a right front panel (4) connected to the two gusseted edges (2), the left front panel (3) overlapping the outer surface of the right front panel (4), the right side of the left front panel (3) sealing the right front panel (4) to form a right longitudinal sealing edge (31), the left side of the right front panel (4) sealing the left front panel (3) to form a left longitudinal sealing edge (41), a longitudinal baffle (5) for blocking powder is provided between the left longitudinal sealing edge (41) and the right longitudinal sealing edge (31), the left longitudinal sealing edge (41), the right longitudinal sealing edge (31) and the longitudinal baffle (5) separating the overlapping area of ​​the left front panel (3) and the right front panel (4) to form a plurality of longitudinal air channels (6). A set of breathable structures (42) for introducing gas in the bag into the left longitudinal airway (6) is provided on the right front panel (4) within the left longitudinal airway (6) section. The longitudinal baffle (5) is provided with an air inlet (51) that connects two adjacent longitudinal air passages (6); The right longitudinal sealing edge (31) is provided with an exhaust port (7) for discharging gas from the longitudinal air passage (6) into the bag body. The exhaust port (7) and the air inlet (51) are offset from each other.

2. The powder packaging bag with a labyrinthine venting structure according to claim 1, characterized in that: Two exhaust ports (7) are provided on the right longitudinal sealing edge (31), and the two exhaust ports (7) are respectively located near the upper and lower ends of the bag body.

3. The powder packaging bag with a labyrinthine venting structure according to claim 1, characterized in that: The breathable structure (42) consists of a number of micropores or a number of long strip slits.

4. The powder packaging bag with a labyrinthine venting structure according to claim 1, characterized in that: The left front panel (3) or the right front panel (4) is provided with a set of protruding structures (8) that protrude toward the longitudinal air passage (6) to prevent the left front panel (3) from sticking to the right front panel (4).

5. The powder packaging bag with a labyrinthine venting structure according to claim 4, characterized in that: The protruding structure (8) is a protrusion on the left front panel (3) or the right front panel (4).

6. The powder packaging bag with a labyrinthine venting structure according to claim 1, characterized in that: At least two longitudinal baffles (5) are provided, and the positions of the vents (51) on two adjacent longitudinal baffles (5) are staggered from each other, and the positions of the vent (51) on the rightmost longitudinal baffle (5) and the exhaust port (7) are staggered from each other.

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