Multi-cavity microwave exhaust self-standing bag

Abstract

The invention provides a microwave exhaust self-standing pouch which comprises a pouch body with a heat-sealed edge, the pouch body is divided into at least two cavities through a transverse heat-sealing area easy to uncover, an exhaust channel is arranged on the inner side of the heat-sealing area easy to uncover, and one of the adjacent cavities of the exhaust channel is provided with a stress concentration structure; the tail end of the exhaust channel extends to the edge of the bag body to form an exhaust port. Solid and fluid split charging is achieved through cavity separation, steam is directionally discharged through an exhaust channel during heating, content mixing is avoided, an exhaust port is a non-heat-sealing area and is sealed through an easily-uncovered heat-sealing area in a normal state, and stress concentration directional pressure relief is achieved by combining the interior with a convex structure; the supporting cavity extending from the lower cavity body is expanded to provide internal support for the multiple cavities, so that the upright property of the bag body is improved; and a filling opening is provided with a heat sealing allowance and a locking edge, so that cavity division filling is simplified. The problem that an existing microwave bag cannot achieve dry-wet separation, anti-explosion safety and structural stability at the same time is solved, and the microwave bag is suitable for instant food packaging needing cavity dividing processing.

Description

Technical Field

[0001] The present invention relates to the technical field of food packaging, in particular to a microwave vented stand-up bag, more particularly to a multi-cavity microwave vented stand-up bag, and also to a method for using the microwave vented stand-up bag. Background Art

[0002] Microwave degassing bags are food packaging designed specifically for microwave heating. Their structural design balances steam emission during food heating with a sealed seal to preserve freshness, ensuring microwave penetration while effectively blocking moisture and odors. They remain airtight at room temperature. When the moisture within the food evaporates due to microwave vibrations and heat, causing the internal gas pressure to exceed a threshold, the bag automatically degasses and releases pressure, preventing the package from bursting. Their convenient and efficient nature makes them well suited to today's fast-paced lives, and these products are becoming increasingly popular among consumers.

[0003] To ensure stable and even heating throughout the microwave, microwave degassing bags often utilize a self-supporting bag body, heat-sealed to create a flat bottom and upright sidewalls. Existing microwave degassing bags often utilize a single chamber, often using multiple smaller pouches to separate fluid contents like sauces and solids like beef and chicken feet. This makes it difficult to accommodate foods like curry rice and noodles with bolognese sauce, which require dry and wet contents to be separated before consumption.

[0004] A Chinese patent application (CN114132616A) provides a portable microwave heating bag. Its technical solution includes an easy-tear guide strip on the bag body, with tear-off notches at both ends. During use, the bag is opened from the tear-off notches on the strip to prevent spillage of the contents due to deviation in tearing direction. Although the patent implicitly discloses the bag's inclusion of upper and lower chambers, the upper chamber is used for venting and tearing, resulting in unnecessary bag loss.

[0005] A Chinese patent (CN219030458U) provides an automatic venting packaging bag for microwave ovens. A single-sided air guide channel is provided in the rubber strip. When water vapor expands due to heat, it gradually peels away the rubber strip and the bag body from the position of the single-sided air guide channel. The single-sided air guide channel also gradually expands upward, further playing the role of guiding the peeling, ensuring smooth and slow discharge of steam and preventing the risk of bag explosion.

[0006] A Chinese patent (CN10444859A) provides a steam-discharging stand-up pouch and a stand-up pouch with contents sealed therein, wherein the technical solution includes adjusting the shape of the sealing process to achieve a more reliable peeling effect.

[0007] A Chinese patent (CN215476854U) provides a microwave exhaust bag. The bag body is provided with a pressure exhaust structure for communicating with the accommodating cavity. The pressure exhaust structure includes an insert and a sealing portion. When the high-pressure steam inside the bag body expands to a certain extent, the sealing portion will be broken open, so that the pressure exhaust structure is connected to the accommodating cavity, and the steam inside the bag body is discharged through the exhaust port, thereby achieving the purpose of automatic exhaust and having good high-temperature explosion-proof effect.

[0008] To maintain effective degassing while also addressing the sterilization requirements and intended use of microwave degassing bags, the aforementioned prior art suffers from a loss of bag volume and lacks suitability for wet-dry food separation. Furthermore, while multi-cavity degassing bags allow for pre-mixing and subsequent heating, this method creates a mixed food mixture, making it difficult to arrange on a plate and degrading its appearance and flavor.

[0009] In view of this, it is necessary to develop a new type of multi-cavity microwave exhaust self-supporting bag. Summary of the Invention

[0010] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a multi-cavity microwave vented stand-up bag.

[0011] To achieve the above objectives, the present invention provides the following technical solutions.

[0012] A microwave vented self-supporting bag comprises a bag body connected by heat-sealing at its edges, wherein the bag body is divided into at least two cavities by a transversely arranged easy-to-peel heat-sealing area, an exhaust channel is left inside the easy-to-peel heat-sealing area, and one of the two cavities adjacent to the exhaust channel is provided with a stress concentration structure; a filling port is provided at the same end of at least two of the cavities, and an exhaust port is provided at the end of the exhaust channel away from the filling port and located at the edge of the bag body.

[0013] To balance normal sealing reliability and overpressure directional exhaust efficiency, the exhaust port is a non-heat-sealable area that extends continuously from the end of the exhaust channel to the edge of the bag. A gradient heat-sealing process is used to form an easy-to-peel heat-sealable area with a specific adhesive strength between the non-heat-sealable area and the exhaust channel for temporary isolation. As a preferred technical solution, the exhaust port is a non-heat-sealable area that extends to the edge of the bag, and the easy-to-peel heat-sealable area is used to temporarily isolate the non-heat-sealable area from the exhaust channel.

[0014] To facilitate single-station positioning and filling of multiple cavities, avoiding the equipment indexing required by traditional left-right split filling ports and the need for three subsequent heat-sealing cycles, each cavity's filling port is positioned to face the same side, improving production efficiency. The two cavity filling ports extend outward, sharing a common heat-seal margin. The heat-sealing blade completes the double-sided seal in a single press, preventing misalignment and leakage caused by multiple heat-sealing cycles. As a preferred technical solution, the filling port extends outward beyond the bottom edge of the bag, leaving a heat-seal margin.

[0015] In order to enhance sealing reliability and process synergy and avoid the risk of interlayer misalignment and leakage caused by multiple heat sealing, the filling port extends outward beyond the bottom edge of the bag body and leaves a heat sealing margin; at the same time, the end of the easy-to-peel heat-seal area close to the filling port is embedded in the interior of the heat sealing margin to form a locking edge. The heat sealing tool completes the overall solidification of the heat sealing margin under one punch, blocking the peeling force from spreading toward the filling port, thereby ensuring the sealing integrity after sub-cavity filling.

[0016] In order to accurately guide the tearing direction of the steam pressure and avoid exhaust failure or incomplete sealing problems caused by tearing path deviation, the stress concentration structure is a convex structure pointing from the first cavity to the second cavity, so that the steam impact force is concentrated on the convex tip, directionally tearing the easy-to-remove heat-sealed area, ensuring that the exhaust channel is effectively opened to achieve controllable pressure relief.

[0017] To improve steam generation control accuracy and pressure relief stability, during microwave heating, the low-liquid cavity generates steam pressure more quickly, preferentially expanding and impacting the convex stress concentration structure, expanding the stress concentration point and triggering directional peeling of the easy-to-peel heat-seal area. As a preferred technical solution, the liquid content in the first cavity is higher than that in the second cavity.

[0018] In order to reduce the pressure relief resistance and improve the controllability of steam emission, as an optimal technical solution, the cross-sectional area of ​​the end section of the exhaust channel is gradually increased, and the end section of the exhaust channel is temporarily fixed by an easy-to-remove heat-sealed area.

[0019] In order to solve the problem of lateral deformation and collapse that may occur during microwave heating of a multi-cavity bag, as an optimal technical solution, among the multiple cavities, a support cavity is provided extending from the cavity located at the lower part of the bag body to the cavity located at the upper part of the bag body. The support cavity is connected to the cavity at the lower part of the bag body and is heat-sealed and isolated from the cavity at the upper part of the bag body. When the support cavity expands, it provides support between the multiple cavities.

[0020] In order to achieve precise molding and functional reliability of the support cavity, as an optimal technical solution, the support cavity is made by a heat sealing process using a hook-shaped hot air knife adapted to the support cavity.

[0021] In order to facilitate users to tear open the packaging bag so as to take out the contents of the packaging bag for consumption, or to tear it open and use it directly as a flexible container, that is, a "bag is a bowl" to improve convenience. As a preferred technical solution, the edge of the bag body at the top is provided with an easy-tear notch.

[0022] The advantages and beneficial effects of the present invention are: the multi-cavity structure formed by the horizontal easy-to-peel heat-sealed area allows solid and fluid contents to be packaged and stored separately. When heated, the steam in the liquid cavity can be discharged in a controllable manner through the exhaust channel to avoid mixing of the contents, thereby ensuring the integrity of the plating and the flavor of the food; the exhaust port is combined with the temporary isolation function of the easy-to-peel heat-sealed area to ensure normal sealing, and only directional pressure relief is performed when the internal pressure exceeds the threshold to prevent the bag from rupturing while maintaining the integrity and reliability of the structure; the heat-sealed margin and locking edge design of the filling port simplifies the cavity filling process, and the easy-to-tear edge on the edge of the bag body makes it easy for users to quickly open the package; the support cavity provides internal support through the extension and expansion of the lower cavity, thereby improving the upright stability of the bag body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is one of the structural schematic diagrams of the present invention; Figure 2 This is the second structural diagram of the present invention; Figure numerals: 1-bag body, 2-easy-to-open heat-seal area, 3-exhaust channel, 4-filling port, 5-exhaust port, 6-heat-seal margin, 7-locking edge, 8-convex structure, 9-first cavity, 10-second cavity, 11-support cavity, 12-easy-to-tear opening. DETAILED DESCRIPTION

[0024] The following embodiments are further described in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0025] Example 1 See also Figure 1-Figure 2This embodiment provides a multi-cavity microwave vented stand-up pouch, comprising a bag body 1 connected by heat-sealed edges. The bag body 1 is constructed of sequentially stacked polyethylene terephthalate, polyamide, and cast polypropylene films. An easy-to-peel heat-seal zone 2 is transversely disposed within the bag body 1, dividing the bag body into two independent upper and lower cavities (a first cavity 9 and a second cavity 10). A linear vent channel 3 with a width of 1.0 mm is reserved inside the easy-to-peel heat-seal zone 2. A stress concentration structure, a convex structure 8, is disposed on the inner wall of the first cavity 9 adjacent to the vent channel 3. The convex structure has a height of 0.8 mm and its tip points toward the second cavity 10. Independent filling ports 4 are provided in the same direction on the right side of the bottom of the bag body 1 for both cavities. The vent channel 3 ends at the left edge of the bag body 1 and is separated from the non-heat-seal zone by the easy-to-peel heat-seal zone 2. The vent channel 5 is a non-heat-seal zone extending to the edge of the bag body 1. The non-heat-seal zone is temporarily separated from the vent channel 3 by the easy-to-peel heat-seal zone 2.

[0026] Example 2 On the basis of Example 1, the bag body 1 is divided into a first cavity 9 and a second cavity 10 by two transverse easy-to-peel heat-seal areas 2. The second cavity 10 located at the bottom of the bag body is heat-sealed by a hook-shaped hot air knife to form an upwardly extending support cavity 11. The support cavity 11 is connected to the second cavity 10, but is completely isolated from the first cavity 9 by a continuous heat-seal line. After expansion, the support cavity 11 can form an arc-shaped support for the two upper cavities. The filling port 4 extends outward beyond the bottom edge of the bag body 1 and leaves a heat-seal margin 6. The end of the easy-to-peel heat-seal area 2 close to the filling port 4 is embedded in the interior of the heat-seal margin 6, and a locking edge 7 is formed inside the heat-seal margin 6. The bag body 1 is provided with an easy-to-tear opening 12 at the top of the edge where the exhaust port is located.

[0027] Example 3 On the basis of Example 2, the cross-sectional area of ​​the end section of the exhaust channel 3 is gradually increased, and the end section of the exhaust channel 3 is temporarily fixed by the easy-to-peel heat-sealing area 2 and isolated from the exhaust port 5 .

[0028] The working principle of the present invention is that an exhaust channel is built into the transverse easy-to-remove heat-seal area, and a convex stress concentration structure is provided in one of the adjacent cavities, with the end extending to the edge of the bag to form an exhaust port. During microwave heating, the steam pressure caused by the expansion of heat triggers the peeling of the easy-to-remove heat-seal area, and the steam is discharged directionally through the exhaust channel to avoid mixing of the contents of multiple cavities, prevent the bulging bag from bursting, and preserve the original appearance of the food. The lower cavity is extended upward through a hook-shaped heat-sealing process to form a support cavity, which is isolated from the upper cavity and provides air cavity support after expansion due to heat; after microwave heating, the steam in the lower cavity pushes the support cavity to expand, forming a curved support structure, which improves the upright stability of the bag and ensures uniform heating in the microwave oven; the filling port extends outward and retains the heat-seal margin, and the easy-to-remove heat-seal area is embedded in the heat-seal margin to form a locking edge, and an easy-to-tear notch is provided at the top of the edge where the exhaust port is located. During the secondary heat sealing after filling, the heat seal margin provides redundant sealing, and the locking edge blocks the peeling of the easy-to-peel heat seal area toward the filling port, simplifying the chamber filling process and reducing the risk of bag leakage; the non-heat seal area of ​​the exhaust port is normally temporarily isolated by the easy-to-peel heat seal area. When the internal pressure is over, only local bonding needs to be broken to achieve directionally venting, keeping the bag appearance intact and avoiding the packaging volume loss caused by the traditional exhaust valve structure.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A microwave vented stand-up bag comprising a bag body (1) with edges heat-sealed, characterized in that: The bag body (1) comprises at least two cavities separated by a transversely arranged easy-to-peel heat-seal area (2); an exhaust channel (3) is left inside the easy-to-peel heat-seal area (2); and a stress concentration structure is provided in the exhaust channel (3) between the two adjacent cavities; a filling port (4) is provided at the same end of at least two of the cavities, and an exhaust port (5) is provided at one end of the exhaust channel (3) away from the filling port (4) and located at the edge of the bag body (1).

2. The microwave vented stand-up pouch according to claim 1, characterized in that: The exhaust port (5) is a non-heat-sealed area, which extends to the edge of the bag body (1), and the non-heat-sealed area and the exhaust channel (3) are temporarily isolated by the easy-to-remove heat-sealed area (2).

3. The microwave vented stand-up pouch according to claim 2, characterized in that: The filling port (4) extends outward beyond the bottom edge of the bag body (1) and leaves a heat-sealing margin (6).

4. The microwave vented stand-up pouch according to claim 3, characterized in that: One end of the easy-to-peel heat-seal area (2) close to the filling port (4) is embedded in the interior of the heat-seal margin (6), and a locking edge (7) is formed inside the heat-seal margin (6).

5. The microwave vented stand-up pouch according to claim 1, characterized in that: The stress concentration structure is a convex structure (8) pointing from the first cavity (9) to the second cavity (10).

6. The microwave vented stand-up pouch according to claim 5, characterized in that: The liquid content in the first cavity (9) is higher than the liquid content in the second cavity (10).

7. The microwave vented stand-up pouch according to claim 1, characterized in that: The cross-sectional area of ​​the end section of the exhaust channel (3) gradually increases, and the end section of the exhaust channel (3) is temporarily fixed by the easy-to-remove heat-sealing area (2).

8. The microwave vented stand-up pouch according to claim 1, characterized in that: Among the multiple cavities, a support cavity (11) is provided in the cavity located at the lower part of the bag body (1) and extends toward the cavity located at the upper part of the bag body (1). The support cavity (11) is communicated with the cavity at the lower part of the bag body (1) and is heat-sealed and isolated from the cavity at the upper part of the bag body (1). When the support cavity (11) expands, it provides support between the multiple cavities.

9. The microwave vented stand-up pouch according to claim 8, characterized in that: The support cavity (11) is manufactured by a heat sealing process using a hook-shaped hot air knife adapted to the support cavity (11).

10. The microwave vented stand-up pouch according to any one of claims 1 to 9, characterized in that: The bag body (1) is provided with an easy-tear notch (12) on the edge at the top.

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