Microwave-safe packaging bag structure that can relieve pressure

Abstract

This invention provides a pressure-relieving microwaveable packaging bag structure. It primarily utilizes a concave upper opening and a weak heat-sealing area within an automatic pressure relief unit. This allows the bag to simultaneously perform short-term pressure-holding cooking and automatic pressure relief during microwave heating. Furthermore, when the internal pressure reaches a predetermined critical value, the weak heat-sealing structure automatically triggers a rupture, causing the adhesive layer to open under pressure and release supersaturated hot steam. This achieves automatic pressure relief without requiring manual cutting or additional operation by the user. This not only improves the quality of food preparation but also ensures safety, demonstrating the practical advancement of this invention in improving the quality of microwaveable food packaging bags.

Claims

1. A pressure-relief microwaveable packaging bag structure, comprising: a bag body having two opposing side film layers and a bottom film layer, wherein the outer periphery of the two side film layers and the bottom film layer are sealed together to form a sealing edge to define an accommodating space; at least one automatic pressure relief unit disposed at a predetermined position on the sealing edge of the bag body, the automatic pressure relief unit comprising a concave upper opening at an upper position and a concave lower opening below the concave upper opening, the concave upper opening and the concave lower opening respectively communicating with the accommodating space, and a weak heat-sealing area is provided in the inner edge region of the two side film layers corresponding to the concave upper opening, the weak heat-sealing area forming a weakened adhesive structure that can be broken by pressure, so that the two side film layers are bonded and sealed at the weak heat-sealing area by an adhesive layer.

2. The microwaveable packaging bag structure with pressure relief as described in claim 1, wherein the automatic pressure relief unit consists of two sets, respectively disposed on both sides of the bag body.

3. The pressure-relief microwave packaging bag structure as described in claim 1, wherein the concave upper opening is an arc-shaped structure.

4. The microwaveable packaging bag structure for pressure relief as described in claim 1, wherein the two side membrane layers are printed with a yellow semi-circular symbol and the text "vapor outlet" at the weak heat seal area of ​​the automatic pressure relief unit.

5. The pressure-relief microwave packaging bag structure as described in claim 1, wherein the inner wall surface of the two side membrane layers is treated with an anti-fogging process, so that hot vapor condenses to form a uniform water film that flows along the inner wall to maintain high transparency inside the bag.

6. The microwaveable packaging bag structure with pressure relief as described in claim 1, wherein the two side films are made of unstretched polypropylene (CPP) or polyethylene (PE) composite material to withstand microwave heating conditions of 700W / 1 minute and shear stress when the seal breaks, and the sealing structure inside the two side films has high heat seal strength and heat resistance, and can withstand high temperature environments of 110°C to 130°C.

7. The pressure-relief microwave packaging bag structure as described in claim 1, wherein the bag body has V-shaped holes on both sides of its upper edge.

Images