Cover to prevent contents from sticking

Abstract

A content adhesion prevention cover material comprises an adhesion prevention layer (6) formed in the external surface of a heat sealing layer (5) piled up on a base layer (1) and including hydrophobic wet silica particles which are wet silica particles and are hydrophobized by using silicone having a viscosity of 100 cst or more, particularly, dimethylpolysiloxane as a treatment agent. Or a content adhesion prevention cover material comprises an adhesion prevention layer (6) formed in the external surface of a heat sealing layer (5) piled up on a base layer (1) and including hydrophobic wet silica particles which are wet silica particles and are hydrophobized to have a di-n-butylamine absorption amount (DBA absorption amount) of less than 200 mmol / kg. With these constitutions, the content adhesion prevention cover material is able to effectively prevent content of a yogurt, etc. from adhering to the back surface of the cover while maintaining fine heat sealability.

Description

technical field [0001] The present invention relates to a heat-sealable lid mainly used in food packaging containers, and more specifically, to a cup-shaped container used in packaging of yogurt, jelly, pudding, jam, and milk coffee (Caffellatte). Cover with anti-adhesion of contents. Background technique [0002] This type of heat-sealing (heat-sealing) lid (lid material) is generally formed on the aluminum foil side of the base layer composed of a laminate of base film and aluminum foil, with an intermediate resin layer interposed therebetween if necessary. A cover with a heat-sealing agent, that is, a heat-sealing layer (heat-sealing layer), which covers the upper opening of the cup-shaped container body filled with packaged objects such as yogurt, and is heated by fusing the peripheral part to the container body. On the upper edge flange part, to form a sealed package. [0003] Therefore, such a cover is required to have good heat-sealability, airtightness, and suitabl...

AI Technical Summary

Problems solved by technology

[0010] However, on the other hand, since the particle size of wet silica particles is relatively large, compared with the case of using dry silica particles composed of aggregates of ultrafine primary particles, the coating amount (adhesion amount) ) The surface hydrophobicity in the relative relationship is poor. In order to obtain high anti-adhesion performance, a slightly larger amount of hydrophobic wet silica coating is required. Therefore, there is also adhesion (adhesion; Adhesion) is easy to deteriorate, and further improvement in these aspects is strongly required for practical use

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