Cooking-resistant food packaging bag

Abstract

The invention discloses a cooking-resistant food packaging bag which comprises a packaging bag body, and side sealing pieces folded inwards are arranged on the two sides of the packaging bag body. A transverse hot-pressing separation strip is arranged on the packaging bag main body, and a packaging cavity for packaging food and an expansion cavity containing water inside are formed in the upper side and the lower side, corresponding to the hot-pressing separation strip, in the packaging bag main body respectively; a top sealing edge is arranged at the top end of the packaging bag body, and a bottom sealing edge is arranged at the bottom end of the packaging bag body. Side protruding strips protruding downwards are arranged on the two sides of the bottom edge of the bottom sealing edge, and a middle protruding strip protruding downwards is arranged in the middle of the bottom edge of the bottom sealing edge. Cavities communicating with the expansion cavity are formed in the middle protruding strip and the two side protruding strips, grabbing pieces extending downwards are arranged at the bottom ends of the two side protruding strips, the bottom end of the middle protruding strip is arranged in an opening shape, a pressure release valve is connected to the opening, and the air outlet end of the pressure release valve is in threaded sealing connection with a cap. The cooking pot can be conveniently taken out after cooking is completed, and has the advantages of being convenient to use, safe, non-toxic, high in strength and good in heat conductivity.

Description

Technical Field

[0001] The invention relates to the field of food packaging bags, in particular to a retort-resistant food packaging bag. Background Art

[0002] Retort food packaging bags, also known as high-temperature retort bags, have the advantages of both canned containers and boiling water-resistant plastic bags. They are suitable for packaging foods such as meat and soy products, and can better maintain the flavor of the food itself.

[0003] When the food inside the retort-resistant food packaging bag needs to be heated, in order to ensure that the food inside can be completely heated, the entire retort-resistant food packaging bag generally needs to be completely immersed in water, and then the water is heated to boiling for a period of time, at which time the food inside the retort-resistant food packaging bag can be fully heated; however, after the heating is completed, the retort-resistant food packaging bag is still immersed in water, which is inconvenient for users to take out.

[0004] Therefore, the existing retort-resistant food packaging bags have the problem that it is inconvenient to take out after retort heating is completed. Summary of the invention

[0005] The object of the present invention is to provide a retort-resistant food packaging bag, which has the advantage of being convenient to take out after retort.

[0006] The technical solution of the present invention is as follows: a cooking-resistant food packaging bag comprises a packaging bag main body, and side sealing sheets folded inwardly are arranged on both sides of the packaging bag main body; a transverse hot-pressed dividing strip is arranged on the packaging bag main body, and the upper and lower sides corresponding to the hot-pressed dividing strip in the packaging bag main body are respectively a packaging cavity for packaging food and an expansion cavity containing water inside; a top sealing edge is arranged at the top of the packaging bag main body, and a bottom sealing edge is arranged at the bottom end of the packaging bag main body; side convex strips protruding downwardly are arranged on both sides of the bottom edge of the bottom sealing edge, and a middle convex strip protruding downwardly is arranged in the middle of the bottom edge of the bottom sealing edge; a cavity connected to the expansion cavity is arranged in the middle convex strip and the two side convex strips, and downwardly extending grabbing sheets are arranged at the bottom ends of the two side convex strips, and the bottom ends of the two side convex strips are arranged, and the bottom end of the middle convex strip is arranged in an open shape and a pressure relief valve is connected to the opening, and a cap is threadedly sealed at the air outlet end of the pressure relief valve.

[0007] In the aforementioned anti-steaming food packaging bag, the pressure relief valve includes a cylindrical valve body, the surface of the valve body is provided with a plurality of annular protrusions distributed at intervals, the valve body extends into the opening of the middle convex strip and is hot-pressed and sealed with the middle convex strip; the top of the valve body is provided with a pressure relief port, the bottom of the valve body is provided with a cylindrical pressure relief nozzle extending downward from the bottom of the middle convex strip, and the outer side of the pressure relief nozzle is provided with a thread matching the cap; a plunger is slidably arranged in the valve body, the top of the plunger is hemispherically arranged and sealingly arranged at the pressure relief port, and a plurality of convex strips distributed at intervals of annular shapes are connected to the side of the plunger, each convex strip is fitted with the inner wall of the valve body and is arranged vertically; a spring is provided on the outer sleeve of the bottom end of the plunger, and the spring is clamped between the bottom end of the convex strip and the bottom end of the valve body.

[0008] In the aforementioned retort-resistant food packaging bag, a tooth-shaped tearing opening is provided on one side of the top end of the top seal edge.

[0009] In the aforementioned retort-resistant food packaging bag, the grabbing piece is provided with a through hole.

[0010] In the aforementioned retort-resistant food packaging bag, multiple layers of stacked folds are provided on both the front and rear side surfaces of the packaging bag body corresponding to the expansion cavity.

[0011] In the aforementioned retort-resistant food packaging bag, the front and rear side surfaces and the side sealing sheets of the packaging bag body are all composed of a PP layer, an aluminum foil layer and a PET layer laminated in sequence from the inside to the outside.

[0012] Compared with the prior art, the present invention divides the interior of the packaging bag body into an upper packaging cavity for packaging food and a lower expansion cavity for containing water by using a hot-pressed partition strip, and inwardly folded side sealing sheets are provided on both sides of the packaging bag body. Under normal temperature conditions, after the packaging bag body is placed in water, the packaging bag body can sink into the water because the density of general food is greater than that of water; then, as the water is heated, the packaging bag body and the food and water inside it are also heated synchronously; when the water boils, the water in the packaging bag body also begins to boil and converts into water vapor and expands the expansion cavity (the folded side sealing sheets are expanded outward), the density of the expansion cavity decreases and gradually floats to the surface, and it appears that the food is still remaining in the water for comprehensive heating, and the expansion cavity floats on the water surface, which makes it convenient for the user to take the packaging bag body out of the water through the expansion cavity floating on the water surface; because raised side convex strips are provided on both sides of the bottom edge of the expansion cavity, the cavity inside the side convex strips is connected to the expansion cavity, and when the expansion cavity expands, the cavities in the two side convex strips can also expand and stand up, thereby lifting the grabbing pieces at the ends of the side convex strips, further facilitating the user to take out the packaging bag body by clamping the grabbing pieces with tools. A central convex strip is provided in the middle of the bottom edge of the expansion cavity, and the cavity inside the central convex strip is connected to the expansion cavity. When the air pressure in the expansion cavity is too high, the pressure can be relieved through the pressure relief valve on the central convex strip to avoid safety hazards caused by rupture of the expansion cavity. The top seal on the packaging bag body corresponding to the top of the packaging cavity needs to be placed in the packaging cavity before hot pressing. The threaded seal connection at the outlet end of the pressure relief valve is equipped with a cap, so that even if the packaging bag body is squeezed during transportation, the water in the expansion cavity will not be squeezed out.

[0013] In addition, the surface of the valve body of the pressure relief valve in the present invention is provided with multiple circles of annular protrusions distributed at intervals, and the sealing performance of the valve body and the opening of the middle convex strip after hot pressing and packaging is good; the valve body pressure relief port is sealed by a spring and a plunger in the valve body, and the pressure relief pressure is controlled by the elastic force of the spring, with a simple structure and low cost; a plurality of vertical convex strips distributed at intervals in annular circles are connected to the side of the plunger, and the convex strips slide and fit on the inner wall of the valve body to ensure the stability of the plunger when sliding.

[0014] A tooth-shaped tearing opening is arranged on one side of the top of the top sealing edge, so that the user can tear open the top sealing edge conveniently.

[0015] The grabbing piece is provided with a through hole, which is convenient for the hook to pass through and the removal operation is convenient.

[0016] The front and rear side surfaces of the packaging bag body corresponding to the expansion cavity are both provided with multiple layers of overlapping folds, which increases the maximum expansion volume of the expansion cavity and ensures that the expansion cavity has greater buoyancy after being expanded by water vapor and can float to the surface, making the removal operation convenient.

[0017] The front and rear sides and side sealing sheets of the packaging bag body are made of PP layer, aluminum foil layer and PET layer composited from the inside to the outside, and have the advantages of safety, non-toxicity, high strength and good thermal conductivity.

[0018] Therefore, the invention can not only be convenient to take out after the cooking is completed, but also has the advantages of being easy to use, safe and non-toxic, high in strength and good in thermal conductivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 It is a schematic structural diagram of the bottom portion of the present invention after sectioning;

[0021] Figure 3 It is a schematic diagram of the composite structure of the front and rear sides of the packaging bag body and the side sealing sheet;

[0022] Figure 4 It is a schematic diagram of the structure of the fold part;

[0023] Figure 5 It is a schematic diagram of the structure of the pressure relief valve;

[0024] Figure 6 It is a schematic diagram of the structure of the top of the packaging bag body before the top seal edge is formed.

[0025] The marks in the accompanying drawings are: 1-packaging bag body, 2-side sealing sheet, 3-hot-pressed dividing strip, 4-packaging cavity, 5-expansion cavity, 6-top edge sealing, 7-bottom edge sealing, 8-side convex strip, 9-middle convex strip, 10-cavity, 11-grabbing sheet, 12-pressure relief valve, 13-cover cap, 14-valve body, 15-annular protrusion, 16-pressure relief port, 17-pressure relief nozzle, 18-plunger, 19-convex strip, 20-spring, 21-toothed tearing hole, 22-through hole, 23-fold, 24-PP layer, 25-aluminum foil layer, 26-PET layer. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0027] Embodiment. A retort-resistant food packaging bag, comprising: Figures 1 to 6As shown, it includes a packaging bag main body 1, and side sealing sheets 2 folded inward are provided on both sides of the packaging bag main body 1; a transverse hot-pressed dividing strip 3 is provided on the packaging bag main body 1, and the upper and lower sides corresponding to the hot-pressed dividing strip 3 in the packaging bag main body 1 are respectively a packaging cavity 4 for packaging food and an expansion cavity 5 containing water inside; a top sealing edge 6 is provided at the top of the packaging bag main body 1, and a bottom sealing edge 7 is provided at the bottom end of the packaging bag main body 1; downwardly protruding side convex strips 8 are provided on both sides of the bottom edge of the bottom sealing edge 7, and a downwardly protruding middle convex strip 9 is provided in the middle of the bottom edge of the bottom sealing edge 7; a cavity 10 connected to the expansion cavity 5 is provided in the middle convex strip 9 and the two side convex strips 8, and downwardly extending grabbing sheets 11 are provided at the bottom ends of the two side convex strips 8, the bottom end of the middle convex strip 9 is arranged in an open shape and a pressure relief valve 12 is connected to the opening, and a cap 13 is threadedly sealed at the air outlet end of the pressure relief valve 12.

[0028] The pressure relief valve 12 includes a cylindrical valve body 14, and the surface of the valve body 14 is provided with a plurality of annular protrusions 15 spaced apart. The valve body 14 extends into the opening of the middle convex strip 9 and is hot-pressed and sealed with the middle convex strip 9. The top of the valve body 14 is provided with a pressure relief port 16, and the bottom of the valve body 14 is provided with a cylindrical pressure relief nozzle 17 extending downward from the bottom of the middle convex strip 9, and the outer side of the pressure relief nozzle 17 is provided with a thread that cooperates with the cap 13. A plunger 18 is slidably arranged in the valve body 14, and the top of the plunger 18 is hemispherically arranged and sealed and fitted at the pressure relief port 16, and a plurality of annular threads are connected to the side of the plunger 18. The convex strips 19 are arranged at intervals, and each convex strip 19 is in contact with the inner wall of the valve body 14 and is arranged vertically; a spring 20 is provided on the outer sleeve of the bottom end of the plunger 18, and the spring 20 is clamped between the bottom end of the convex strip 19 and the bottom end of the valve body 14; a tooth-shaped tearing hole 21 is provided on one side of the top end of the top sealing edge 6; a through hole 22 is provided on the grabbing piece 11; multi-layered folds 23 are provided on the front and rear side surfaces of the packaging bag body 1 corresponding to the expansion cavity 5; the front and rear side surfaces of the packaging bag body 1 and the side sealing sheet 2 are composed of a PP layer 24, an aluminum foil layer 25 and a PET layer 26 compounded in sequence from the inside to the outside.

[0029] Working principle: When in use, first remove the cap 13 from the pressure relief nozzle 17 of the pressure relief valve 12, then completely immerse the packaging bag body 1 in the water in the pot, and finally heat the pot. As the heating progresses, the water in the pot is heated to boiling, and the food in the packaging cavity 4 and the water in the expansion cavity 5 can be heated; wherein, the water in the expansion cavity 5 also begins to boil and vaporize, thereby expanding the side sealing sheets 2 folded inward on the left and right sides of the expansion cavity 5 and the multi-layered folds 23 on the front and back side surfaces, reducing the density of the expansion cavity 5, so that the expansion cavity 5 floats upward to the surface of the water, while the packaging cavity 4 sealed with the actual object is still immersed in the water for heating; because the side convex strips 8 on both sides of the bottom edge of the bottom sealing edge 7 and the cavity 10 in the middle convex strip 9 in the middle of the bottom plate are connected to the expansion cavity 5, the cavity 10 in the two side convex strips 8 can expand and stand up, thereby The grabbing piece 11 at the end is lifted, which is convenient for the user to lift the entire packaging bag body 1 by passing the hook through the through hole 22 on the grabbing piece 11; when the air pressure in the expansion chamber 5 is too high, the internal air pressure can lift the plunger 18 at the pressure relief port 16, so that the spring 20 is compressed, and then the gas in the expansion chamber 5 can be exhausted through the pressure relief port 16, the gap between adjacent ridges 19 and the pressure relief nozzle 17, so as to avoid safety hazards caused by excessive air pressure in the expansion chamber 5; finally, take out the packaging bag body 1 and leave it for a while, then open the packaging chamber 4 through the serrated tearing hole 21 on the top sealing edge 6, and then pour the heated food into the plate.

[0030] Since the side sealing sheets 2 on both sides of the packaging bag body 1 are arranged in an inward folding shape, and the folds 23 on the front and rear sides of the expansion chamber 5 are arranged in a multi-layer stacked shape, the overall space occupied is small when no food is loaded, which is convenient for transportation; since the pressure relief nozzle 17 is sealed with a cap 13 on the external thread, even if the expansion chamber 5 is squeezed during transportation, the water inside will not flow out from the pressure relief port 16; the top sealing edge 6 needs to be hot-pressed after the food is loaded into the packaging chamber 4. The surface of the valve body 14 in the pressure relief valve 12 is provided with multiple circles of annular protrusions 15 spaced apart, so that the valve body 14 and the middle convex strip 9 have better sealing performance after hot-pressing packaging.

[0031] Since the front and rear sides and the side sealing sheet 2 of the packaging bag body 1 are all composed of the PP layer 24, the aluminum foil layer 25 and the PET layer 26 which are compounded in sequence from the inside to the outside, they have good strength, safety and thermal conductivity.

Claims

1. A retort-resistant food packaging bag, comprising a packaging bag body (1), with side sealing sheets (2) folded inwardly arranged on both sides of the packaging bag body (1); characterized in that: The packaging bag body (1) is provided with a transverse hot-pressed dividing strip (3), and the upper and lower sides of the packaging bag body (1) corresponding to the hot-pressed dividing strip (3) are respectively a packaging cavity (4) for packaging food and an expansion cavity (5) containing water inside; the top of the packaging bag body (1) is provided with a top sealing edge (6), and the bottom of the packaging bag body (1) is provided with a bottom sealing edge (7); both sides of the bottom edge of the bottom sealing edge (7) are provided with downwardly protruding side convex strips (8), and the middle part of the bottom edge of the bottom sealing edge (7) is provided with a downwardly protruding middle convex strip (9); the middle convex strip (9) and the two side convex strips (8) are provided with a cavity (10) connected to the expansion cavity (5), and the bottom ends of the two side convex strips (8) are provided with downwardly extending grabbing pieces (11), the bottom end of the middle convex strip (9) is arranged in an open shape and a pressure relief valve (12) is connected to the opening, and the air outlet end of the pressure relief valve (12) is threadedly sealed and connected to a cap (13).

2. The retort-resistant food packaging bag according to claim 1, characterized in that: The pressure relief valve (12) comprises a cylindrical valve body (14), the surface of the valve body (14) is provided with a plurality of annular protrusions (15) spaced apart from each other, the valve body (14) extends into the opening of the middle convex strip (9) and is hot-pressed and sealed with the middle convex strip (9); the top of the valve body (14) is provided with a pressure relief port (16), the bottom of the valve body (14) is provided with a cylindrical pressure relief nozzle (17) extending downward from the bottom of the middle convex strip (9), and the outer side surface of the pressure relief nozzle (17) is provided with a threaded portion that cooperates with the cover cap (13) A plunger (18) is slidably arranged in the valve body (14), the top of the plunger (18) is hemispherical and sealingly fitted at the pressure relief port (16), and a plurality of convex strips (19) distributed in an annular manner are connected to the side of the plunger (18), each convex strip (19) is fitted with the inner wall of the valve body (14) and is arranged vertically; a spring (20) is provided on the outer sleeve of the bottom end of the plunger (18), and the spring (20) is clamped between the bottom end of the convex strip (19) and the bottom end of the valve body (14).

3. The retort-resistant food packaging bag according to claim 1, characterized in that: A tooth-shaped tearing opening (21) is provided on one side of the top end of the top sealing edge (6).

4. The retort-resistant food packaging bag according to claim 1, characterized in that: The grabbing piece (11) is provided with a through hole (22).

5. The retort-resistant food packaging bag according to claim 1, characterized in that: Multiple layers of stacked folds (23) are provided on both the front and rear side surfaces of the packaging bag body (1) corresponding to the expansion cavity (5).

6. The retort-resistant food packaging bag according to claim 1, characterized in that: The front and rear side surfaces and the side sealing sheet (2) of the packaging bag body (1) are all composed of a PP layer (24), an aluminum foil layer (25) and a PET layer (26) which are composited in sequence from the inside to the outside.

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