Easily openable sealed container and process for producing the same
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorsSeigo Akazawa, Tadao Takagaki
Life of this patent
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Abstract
The present invention provides an easily openable sealed container consisting of a lid and a main body having a flange, wherein a sealing layer of the main body or a sealing layer of the lid has a number of microdents in the flange portion, the thickness of said sealing layer is 10-100 .mu., said sealing layer and an adjacent layer contacting therewith have a lamination strength of 300-2,000 g/25 mm width, and said sealing layer and the lid or the main body are sealed in the flange portion at a strength larger than said lamination strength, as well as a process for producing said sealed container.
Claims4
A process for producing an easily openable sealed container, which comprises
- (1) applying a bearer to a container main body having a flange with a backside and a sealing surface side, at the innermost circumferential portion of the backside of the flange portion, wherein the main body consists of a multi-layer sheet comprising a sealing layer and an adjacent layer contacting therewith, the lamination strength between the sealing layer and the adjacent layer is 300-2,000 g/25 mm width and the sealing layer has a thickness of 10-100 .mu.m,
- (2) applying an ultrasonic treatment to the flange portion from the sealing surface side by using an ultrasonic horn having a head provided with micro-projections in dots having pitch intervals of 0.3-0.8 mm, to form microdents on the sealing surface of the flange portion of the main body, and
- (3) heat-sealing the whole sealing surface of the flange portion with a lid so that the sealing strength between the sealing layer of the flange portion of the main body and the lid is larger than the lamination strength between the sealing layer and the adjacent layer of the main body.
Dependencies are inferred from the claim text.