Packaging container

Abstract

A packaging container, comprising a synthetic resin container body (3) having a flange part (2) at its upper end opening peripheral edge and a container cover having a top board part (4) heat-sealed to the upper surface of the flange part (2) of the container body (3) and a skirt part (5) formed suspendedly from its top board part peripheral edge. The packaging container also comprises a first cutout part (7) at the outer edge upper end of the flange part (2). Since the first cutout part (7) is formed, the container cover can be stably sealed and easily and securely unsealed by suppressing the effect of a molten resin on the bent corner part of the skirt part of the container cover when the container cover is heat-sealed to the container body.

Description

technical field [0001] The present invention relates to a packaging container comprising a synthetic resin container body and a container cover. The container body has a flange at the periphery of the upper end opening. The container cover has a top plate and a skirt hanging down from the periphery of the top plate. The top plate is heated. Sealed on the upper surface of the flange of the container body. Background technique [0002] In the past, as beverage containers, yogurt containers, individual wrapping containers, bowl noodle and other food containers, or disposable medical supplies synthetic resin containers, tensile strength, heat resistance, light resistance, formability, and surface smoothness were often used. The so-called general purpose polystyrene resin (GPPS, General Purpose Polystyrene) such as a good styrene homopolymer, or the impact-resistant polystyrene (HIPS, HIPS, High Impact Polystyrene). Use an aluminum laminate with an aluminum foil as the base mat...

AI Technical Summary

Problems solved by technology

[0009] In the conventional packaging container, when the container body is taken out during the molding of the container body, the flange is mostly partially deformed. Since the amount of deformation varies, the flange and the container cap cannot be evenly sealed, resulting in poor sealing.

In addition, the wall thickness of the main body of the container, especially the main body of the blow-molded container, is different, and there is usually uneven thickness. The recoil force of the thick wall side of the container is large, while the recoil force of the thin wall side of the container is small. large values, so the seal strengths deviate from each other

That is, since the container cap has a skirt, it blocks the vertically downward portion of the flange, making it difficult to seal, and the sealing pressure compresses the entire container, and the sealing strength of the entire sealing portion is not uniform. As a result, if the ease of peeling is satisfied, the The drop strength cannot be met; if a strong seal with drop strength is required, edge breaking will occur when the seal is opened

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