A packaging bag having a one-way exhaust structure

Abstract

This utility model relates to the field of packaging technology and discloses a packaging bag with a one-way ventilation structure, including a packaging bag body, bottom corner flaps, a one-way ventilation structure on the sealing edge, and a humidity buffer structure. The bottom corner flaps are symmetrically arranged at the bottom of the packaging bag body to support the packaging bag body upright. The one-way ventilation structure on the sealing edge is located on one side of the outer wall edge of the packaging bag body. This utility model utilizes ultrasonic embossing to create microporous channels with smooth inner walls and clear boundaries, meeting the molecular sieving requirements of allowing carbon dioxide to escape while blocking oxygen and water vapor from entering. The tortuous microporous structure, combined with surface tension, can prevent external oxygen, water vapor, and dust particles from entering the bag, thus preventing oxidation, deterioration, and mold growth of the contents, and reducing the impact of external contaminants on the internal items. It is particularly suitable for scenarios with high storage environment requirements (such as baked goods and dried goods).

Description

Technical Field

[0001] This utility model relates to the field of packaging technology, specifically to a packaging bag with a one-way venting structure. Background Technology

[0002] In the packaging of food, dried goods and other items, packaging bags not only need to achieve basic sealing and protection functions, but also need to solve two core problems: First, gases such as carbon dioxide generated during the storage of contents are prone to accumulate, leading to increased air pressure inside the bag and causing the packaging to bulge and rupture; second, external moisture intrusion or internal humidity imbalance can easily cause the contents to become damp and moldy, and deteriorate in quality.

[0003] Currently, most mainstream one-way ventilation solutions rely on independent plastic one-way ventilation valves or plastic breathable membranes. These structures require the separate manufacture of plastic components through injection molding, followed by bonding and heat sealing processes before assembly with the packaging bag body. This solution has significant drawbacks: firstly, the plastic components are mostly non-degradable petroleum-based materials, which can easily form environmental pollutants after use, contradicting the current industry development trend of green packaging and circular economy; secondly, the assembly process of independent components is complex, increasing production time and costs, and is prone to ventilation failure or reduced sealing due to gaps between the component and the bag body, making it impossible to reliably guarantee the one-way ventilation effect.

[0004] Meanwhile, traditional humidity control solutions often use separate silica gel desiccant packets, which require manual placement into the packaging bag. This not only increases labor costs but also poses a risk of desiccant packet displacement or damage leading to adsorbent leakage and contamination of the contents. Although some solutions attempt to combine the adsorbent with the packaging, they lack a dedicated structure to fix the adsorbent, which can easily lead to problems such as adsorbent clumping and insufficient contact with the air inside the bag, resulting in a significant reduction in humidity control efficiency.

[0005] Therefore, the industry urgently needs a packaging bag structure that does not rely on independent plastic ventilation components, can be integrally molded with an environmentally friendly process to form a one-way ventilation channel, and can stably fix the humidity adsorbent and avoid adsorbent pollution, in order to solve the technical pain points of traditional solutions such as poor environmental performance, low production efficiency and insufficient functional stability. Utility Model Content

[0006] The purpose of this utility model is to provide a packaging bag with a one-way exhaust structure, which solves the technical problem that traditional packaging bags are unable to simultaneously ensure the exhaust of internal gases and the blocking of external oxygen and moisture, causing the contents to easily bulge and rupture due to excessive gas pressure or deteriorate due to moisture and oxidation. It achieves the goal of both directional exhaust of gases (such as carbon dioxide) generated inside the packaging to maintain a suitable gas pressure, and effectively blocking the intrusion of external oxygen and water vapor to maintain a stable internal environment. At the same time, the humidity buffer structure further regulates the internal humidity, thereby improving the storage stability and shelf life of the contents.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a packaging bag with a one-way ventilation structure, comprising a packaging bag body, and further comprising bottom corner flaps, a sealing edge one-way ventilation structure, and a humidity buffer structure; the bottom corner flaps are symmetrically arranged at the bottom of the packaging bag body to support the packaging bag body to stand upright; the sealing edge one-way ventilation structure is arranged on one side of the outer wall edge of the packaging bag body to realize the one-way outward discharge of gas inside the packaging bag; the humidity buffer structure is fixed to the inner wall of the packaging bag body and located inside the one-way ventilation area of ​​the sealing edge one-way ventilation structure to regulate the humidity inside the packaging bag and prevent moisture from penetrating into the ventilation structure.

[0008] Preferably, the one-way ventilation structure of the sealing edge includes a sealing edge, an exhaust channel one, an exhaust channel two, and an integrated one-way microporous channel; the sealing edge is a heat-sealed edge on one side edge of the packaging bag body; the exhaust channel one and the exhaust channel two are equidistantly opened inside the sealing edge along the length direction of the sealing edge, and one end of the exhaust channel one is connected to the outside of the packaging bag body, and one end of the exhaust channel two is connected to the inside of the packaging bag body; the integrated one-way microporous channel is located inside the sealing edge, and its two ends are connected to the other end of the exhaust channel one and the other end of the exhaust channel two, respectively, forming a one-way gas flow path from the inside to the outside of the packaging bag.

[0009] An integrated unidirectional microporous channel is designed, with a tortuous microporous structure that works in conjunction with the exhaust channel. This allows gas generated inside the packaging to escape smoothly, preventing excessive pressure inside the bag from causing it to swell. At the same time, the design of its pore size and surface tension effectively prevent external oxygen and water vapor from entering, reducing the risk of the contents deteriorating due to oxidation or moisture. This achieves "exhausting but not inlet" control. The humidity buffer structure inside the microporous channel regulates the internal humidity through an adsorbent. At the same time, its design covering the inner port of the microporous channel further prevents moisture inside the bag from directly contacting the microporous channel, preventing moisture from condensing and clogging the channel. This ensures the long-term stability of the microporous exhaust function, forming a dual moisture-proof system of "active humidity regulation + physical barrier".

[0010] Preferably, the integrated unidirectional microporous channel has a tortuous microporous structure, allowing carbon dioxide molecules inside the packaging bag to escape outward through exhaust channel two, the integrated unidirectional microporous channel, and exhaust channel one. The pore size and tortuous structure of the integrated unidirectional microporous channel, through surface tension, prevent external oxygen molecules and water vapor molecules from entering the packaging bag through the aforementioned paths.

[0011] Preferably, the humidity buffer structure includes a thin cotton paper I, a thin cotton paper II, and an absorbent; the thin cotton paper I and the thin cotton paper II are stacked in parallel, and each of their inner walls has a pressure groove, forming an absorbent placement groove between them; the absorbent is filled in the absorbent placement groove and is used to adsorb and regulate the humidity inside the packaging bag.

[0012] An adsorbent placement slot is incorporated, which, through the overlapping and pressing structure of two pieces of cotton paper, forms an independent and enclosed space. This slot stably confines the adsorbent within the slot, preventing it from shifting, scattering, or clumping during packaging, transportation, and stacking. This fixing method avoids direct contact between the adsorbent and the contents of the bag, preventing contamination, while ensuring the adsorbent remains in full contact with the air inside the bag. It prevents localized humidity control failure due to positional shift. The placement slot, along with the humidity buffer structure, covers the inner side of the one-way ventilation area. The adsorbent it carries pre-absorbs moisture from inside the bag, reducing the probability of moisture directly contacting the ventilation structure and preventing condensation and blockage in the ventilation channels, thus ensuring long-term stability of the one-way ventilation function. Simultaneously, the structured design of the placement slot allows the humidity buffer structure to be precisely fixed in the preset position, preventing overall displacement due to adsorbent filling, ensuring effective coverage of the ventilation area, and achieving synergistic protection of moisture prevention and ventilation functions.

[0013] Preferably, the side of the thin cotton paper away from the second thin cotton paper is fixedly connected to the inner wall of the packaging bag body, and the projection of the entire humidity buffer structure covers the port area of ​​the integrated unidirectional microporous channel facing the inside of the packaging bag.

[0014] This utility model provides a packaging bag with a one-way venting structure. It has the following beneficial effects:

[0015] (1) The microporous channel formed by ultrasonic embossing has a smooth inner wall and clear boundaries, which can meet the molecular sieving requirements of allowing carbon dioxide to escape and blocking oxygen and water vapor from entering. The tortuous microporous structure combined with surface tension can block external oxygen, water vapor and dust particles from entering the bag, which can prevent the contents from oxidizing and deteriorating, getting damp and moldy, and reduce the impact of external pollutants on the internal items. It is especially suitable for scenarios with high requirements for storage environment (such as baked goods, dried goods, etc.).

[0016] (2) This utility model can actively adsorb excess water vapor (such as moisture from environmental infiltration and the contents themselves) in the packaging through the built-in adsorbent, so as to avoid moisture accumulation that causes the contents to mold, clump or deteriorate. It is especially suitable for dried goods and baked goods. The structure covers the inside of the one-way ventilation area, which can intercept moisture in advance and prevent moisture from condensing into water after entering the ventilation channel, thus avoiding the failure of the one-way exhaust function due to channel blockage, forming a dual protection of humidity protection and exhaust guarantee. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a partial view of the one-way ventilation structure with sealed edge of this utility model;

[0019] Figure 3 This is a cross-sectional view of the integrated unidirectional microporous channel of this utility model;

[0020] Figure 4 This is a partial view of the humidity buffer structure of this utility model.

[0021] In the diagram: 1. Packaging bag body; 2. Bottom corner flaps; 3. One-way ventilation structure of the sealing edge; 311. Sealing edge; 312. Exhaust channel one; 313. Exhaust channel two; 314. Integrated one-way microporous channel; 315. Oxygen molecules; 316. Carbon dioxide molecules; 4. Humidity buffer structure; 411. Thin cotton paper one; 412. Thin cotton paper two; 413. Pressure groove; 414. Adsorbent placement groove; 415. Adsorbent. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Examples of the 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 intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] Example 1:

[0025] Based on the current technical problems of traditional packaging bags, which are unable to simultaneously allow internal gas to escape and prevent external oxygen and moisture from entering, leading to the contents easily bursting due to excessive gas pressure or deteriorating due to moisture and oxidation, this utility model provides a preferred embodiment of a packaging bag with a one-way venting structure, for example... Figures 1-4 As shown: A packaging bag with a one-way ventilation structure includes a packaging bag body 1, including bottom corner flaps 2, a sealing edge one-way ventilation structure 3, and a humidity buffer structure 4; the bottom corner flaps 2 are symmetrically arranged at the bottom of the packaging bag body 1 to support the packaging bag body 1 to stand upright; the sealing edge one-way ventilation structure 3 is arranged on one side of the outer wall edge of the packaging bag body 1 to realize the one-way outward discharge of gas inside the packaging bag; the humidity buffer structure 4 is fixed to the inner wall of the packaging bag body 1 and is located inside the one-way ventilation area of ​​the sealing edge one-way ventilation structure 3, to regulate the humidity inside the packaging bag and prevent moisture from penetrating into the ventilation structure.

[0026] The one-way ventilation structure 3 of the sealed edge includes a sealed edge 311, an exhaust channel one 312, an exhaust channel two 313, and an integrated one-way microporous channel 314; the sealed edge 311 is the heat-sealed edge of one side edge of the packaging bag body 1; the exhaust channel one 312 and the exhaust channel two 313 are equidistantly opened inside the sealed edge 311 along the length direction of the sealed edge 311, and one end of the exhaust channel one 312 is connected to the outside of the packaging bag body 1, and one end of the exhaust channel two 313 is connected to the inside of the packaging bag body 1; the integrated one-way microporous channel 314 is located inside the sealed edge 311, and its two ends are connected to the other end of the exhaust channel one 312 and the other end of the exhaust channel two 313, respectively, forming a one-way gas flow path from the inside to the outside of the packaging bag.

[0027] The integrated unidirectional microporous channel 314 has a tortuous microporous structure. Carbon dioxide molecules 316 inside the packaging bag body 1 can escape outward through exhaust channel 2 313, integrated unidirectional microporous channel 314 and exhaust channel 1 312. The pore size and tortuous structure of the integrated unidirectional microporous channel 314, through surface tension, prevent external oxygen molecules 315 and water vapor molecules from entering the packaging bag body 1 through the above-mentioned path.

[0028] Furthermore, in the embodiment, the unidirectional microporous channel 314 has a tortuous structure with a pore size matching the size of gas molecules. Carbon dioxide molecules are relatively small and can overcome the surface tension of the micropores to pass through the channel under the propulsion of internal air pressure. They then enter the exhaust channel 312 connected to the outside and are finally discharged outside the bag, preventing the bag from bulging or rupturing due to excessive air pressure inside. When external oxygen or water vapor molecules attempt to enter, on the one hand, the tortuous microporous path increases the resistance to molecule entry; on the other hand, the surface tension of the inner wall of the micropores forms a barrier. In addition, the external air pressure is usually lower than the internal pressure or there is no pressure difference to propel them, making it difficult for oxygen and water vapor molecules to penetrate the micropores. This maintains a stable low-oxygen and low-humidity environment inside the bag, which meets the molecular sieving requirements of allowing carbon dioxide to be discharged and blocking oxygen and water vapor from entering. The tortuous microporous structure combined with the surface tension can block external oxygen, water vapor, and dust particles from entering the bag, which can prevent the contents from oxidizing and deteriorating, becoming damp and moldy, and reduce the impact of external pollutants on the internal items. It is especially suitable for scenarios with high requirements for storage environment (such as baked goods, dried goods, etc.).

[0029] Example 2:

[0030] Based on Embodiment 1, a preferred embodiment of the packaging bag with a one-way exhaust structure provided by this utility model is as follows: Figures 1-4As shown: The humidity buffer structure 4 includes a thin cotton paper 411, a thin cotton paper 412, and an absorbent 415; the thin cotton paper 411 and the thin cotton paper 412 are stacked in parallel, and each of them has a pressure groove 413 on its inner wall, and an absorbent placement groove 414 is formed between them; the absorbent 415 is filled in the absorbent placement groove 414 for adsorption to regulate the humidity inside the packaging bag.

[0031] The side of the thin cotton paper 411 away from the thin cotton paper 412 is fixedly connected to the inner wall of the packaging bag body 1, and the projection of the entire humidity buffer structure 4 covers the port area of ​​the integrated unidirectional microporous channel 314 facing the inside of the packaging bag.

[0032] Furthermore, in the embodiment, when the humidity inside the packaging bag body 1 increases, such as when ambient moisture penetrates or the contents evaporate, the moisture will enter the adsorbent placement groove 414 between the thin cotton paper 1 411 and thin cotton paper 2 412 through the fiber gaps between them, and come into contact with the adsorbent 415 in the groove. The adsorbent has a porous structure that can quickly adsorb moisture, keeping the humidity inside the bag within a suitable range of 40%-60% RH to prevent the contents from getting damp. The adsorbed moisture is firmly locked inside by the adsorbent, and the fibrous structure of the thin cotton paper further prevents moisture from diffusing back into the bag, avoiding secondary dampness. At the same time, the grooves 413 on the cotton paper enhance air permeability, ensuring that moisture can continuously enter the adsorption area, maintaining moisture absorption efficiency, and preventing moisture accumulation that could lead to mold, clumping, or spoilage of the contents. It is especially suitable for dry goods and baked goods. The structure covers the inside of the one-way ventilation area, which can intercept moisture in advance and prevent moisture from condensing into water after entering the ventilation channel, thus avoiding channel blockage and failure of the one-way ventilation function, forming a dual protection of humidity protection and ventilation assurance.

[0033] Working principle: The working principle of this one-way ventilation packaging bag revolves around the core objective of one-way ventilation and humidity control. Through the synergistic effect of the one-way ventilation structure on the sealed side, the humidity buffer structure, and the packaging bag body, it achieves the regulation of the internal environment.

[0034] I. One-way exhaust principle of the one-way ventilation structure 3 with sealed edge

[0035] The sealed-edge unidirectional ventilation structure achieves directional gas flow through a combination of channel guidance and microporous barrier design. The specific process is as follows:

[0036] Internal gas exhaust: When gases such as carbon dioxide are generated inside the packaging bag body 1, such as during food fermentation or respiration, the gas pressure inside the bag increases. The gas first enters the exhaust channel 2 313, which is connected to the inside, and flows along the channel to the integrated unidirectional microporous channel 314.

[0037] Micropore directional penetration: The integrated unidirectional micropore channel 314 has a tortuous structure and the pore size matches the size of gas molecules. Carbon dioxide molecules are relatively small and can overcome the surface tension of the micropores to pass through the channel under the push of internal air pressure. They then enter the exhaust channel 312 connected to the outside and are finally discharged outside the bag, avoiding the bag from bulging or rupture due to excessive air pressure inside the bag.

[0038] External material barrier: When external oxygen and water vapor molecules attempt to enter, on the one hand, the tortuous microporous path increases the resistance to molecular entry; on the other hand, the surface tension of the inner wall of the micropores forms a barrier. In addition, the external air pressure is usually lower than the internal pressure or there is no pressure difference to push it, making it difficult for oxygen and water vapor molecules to penetrate the micropores, thereby maintaining a stable low-oxygen and low-humidity environment inside the bag.

[0039] II. Humidity Regulation Principle of Humidity Buffer Structure 4

[0040] The humidity buffer structure balances the humidity inside the bag and protects the ventilation structure through a dynamic mechanism of adsorption, moisture retention, and protection. The specific logic is as follows:

[0041] Active moisture absorption and control: When the internal humidity of the packaging bag 1 increases, such as due to the penetration of ambient moisture or the evaporation of the contents, the moisture will pass through the fiber gaps between the thin cotton paper 411 and the thin cotton paper 412, and enter the adsorbent placement groove 414 between them, where it will come into contact with the adsorbent 415. The adsorbent has a porous structure, which can quickly absorb moisture and control the humidity inside the bag within a suitable range, typically 40%-60% RH, preventing the contents from becoming damp.

[0042] Moisture Locking and Reverse Barrier: The adsorbed moisture is firmly locked inside by the adsorbent, while the fiber structure of the thin cotton paper further prevents the moisture from diffusing back into the bag, avoiding secondary dampness; at the same time, the grooves 413 on the cotton paper can enhance air permeability, ensuring that moisture can continuously enter the adsorption area and maintain moisture absorption efficiency.

[0043] Ventilation structure protection: Since the humidity buffer structure 4 covers the inner port of the integrated one-way microporous channel 314, it can adsorb the moisture flowing to the micropores in advance, prevent the moisture from condensing into water in the micropores and causing the channel to be blocked, and ensure the long-term stable operation of the one-way exhaust function.

[0044] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A packaging bag with a one-way venting structure, comprising a packaging bag body (1), characterized in that: It also includes a bottom corner flap (2), a one-way ventilation structure (3) on the sealing edge, and a humidity buffer structure (4); the bottom corner flap (2) is symmetrically arranged at the bottom of the packaging bag body (1) to support the packaging bag body (1) to stand upright; the one-way ventilation structure (3) on the sealing edge is arranged on the outer edge of one side of the packaging bag body (1) to realize the one-way outward discharge of gas inside the packaging bag; the humidity buffer structure (4) is fixed to the inner wall of the packaging bag body (1) and located inside the one-way ventilation area of ​​the one-way ventilation structure (3) on the sealing edge, to regulate the humidity inside the packaging bag and prevent moisture from penetrating into the ventilation structure.

2. The packaging bag according to claim 1, characterized in that: The one-way ventilation structure (3) of the sealing edge includes a sealing edge (311), an exhaust channel one (312), an exhaust channel two (313), and an integrated one-way microporous channel (314); the sealing edge (311) is a heat-sealed edge on one side edge of the packaging bag body (1); the exhaust channel one (312) and the exhaust channel two (313) are equidistantly opened inside the sealing edge (311) along the length direction of the sealing edge (311), and one end of the exhaust channel one (312) is connected to the outside of the packaging bag body (1), and one end of the exhaust channel two (313) is connected to the inside of the packaging bag body (1); the integrated one-way microporous channel (314) is located inside the sealing edge (311), and its two ends are connected to the other end of the exhaust channel one (312) and the other end of the exhaust channel two (313), respectively, forming a one-way gas flow path from the inside to the outside of the packaging bag.

3. The packaging bag according to claim 2, characterized in that: The integrated unidirectional microporous channel (314) has a tortuous microporous structure. Carbon dioxide molecules (316) inside the packaging bag body (1) can escape outward through exhaust channel two (313), integrated unidirectional microporous channel (314) and exhaust channel one (312). The pore size and tortuous structure of the integrated unidirectional microporous channel (314) prevent external oxygen molecules (315) and water vapor molecules from entering the packaging bag body (1) through the above-mentioned path by surface tension.

4. The packaging bag according to claim 1, characterized in that: The humidity buffer structure (4) includes a thin cotton paper one (411), a thin cotton paper two (412), and an adsorbent (415); the thin cotton paper one (411) and the thin cotton paper two (412) are stacked in parallel, and pressure grooves (413) are opened on the inner walls of both, and an adsorbent placement groove (414) is formed between them; the adsorbent (415) is filled in the adsorbent placement groove (414) for adsorption to regulate the humidity inside the packaging bag.

5. The packaging bag according to claim 4, characterized in that: The side of the thin cotton paper one (411) away from the thin cotton paper two (412) is fixedly connected to the inner wall of the packaging bag body (1), and the projection of the entire humidity buffer structure (4) covers the port area of ​​the integrated unidirectional microporous channel (314) facing the inside of the packaging bag.

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