Manufacturing method of packaging for microwave heating

Abstract

This invention provides a method for manufacturing a microwave oven heating package, which includes a pressure release section that can safely and reliably release high-pressure steam during microwave heating. The method for manufacturing the package includes a step S24 of completely cutting through a U-shaped cut-in portion in the thickness direction from the outer surface to the inner surface of a sheet member, and a heat-sealing step S25 of partially heat-welding the sealing layers together to form a heat-sealed area to create a food storage space within the package. In the partial re-bonding step S25A, the broken areas of the sealing layers penetrating the cut-in portions of each sheet member are re-bonded. The cut-in portion is formed in a protruding area extending into the food storage space, and the U-shaped bend is formed by a first arc, while the outer edge of the protruding area is formed by a second arc concentric with the first arc. When the radius of the first arc is r1 and the radius of the second arc is r2, r1:r2 = 2~4:8.

Claims

1. A method for manufacturing a microwave oven heating package, the package comprising a plurality of sheet members, each sheet member comprising at least: a sealing layer, a substrate layer laminated on the outer side of the sealing layer in the thickness direction, and a bonding layer connecting the sealing layer and the substrate layer; the method for manufacturing the microwave oven heating package comprising the following steps: a folding step, folding a transport sheet in half to overlap the sheet members in the thickness direction; a complete cutting step, providing a cut-in portion in a portion of a predetermined heat-sealing area of ​​the overlapped sheet members in the entire thickness direction from the outer surface to the inner surface of the sheet members, the cut-in portion being U-shaped and the opening of the U-shape extending outward from the center of the package; a heat-welding step, partially heat-welding the sealing layers of the sheet members to each other to form a heat-sealed area, thereby forming a food storage space in the package; and a partial re-bonding step, in the heat-welding step, re-bonding the broken areas of the sealing layers formed in the cut-in portions of each sheet member in the complete cutting step; In this heat-sealing step, the sealing layers of the sheet member are fused together by forming the heat-sealing area along the periphery of the sheet member and a protruding area protruding from a portion of the periphery into the food storage space; the cutting portion is formed in the protruding area; and the U-shaped reverse bending portion is formed by a first arc, the outer edge of the protruding area is formed by a second arc concentric with the first arc, and when the radius of the first arc is set as r1 and the radius of the second arc is set as r2, r1:r2=3:

8.

2. A method for manufacturing a microwave oven heating package as described in claim 1, wherein, When the heat fusion temperature of this heat fusion step is set to T, it will be within the range of 200℃≦T≦250℃.

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