Process for producing printed container for food packaging
AssigneeSumitomo Bakelite Co., Ltd.
InventorTadao Takagaki
Life of this patent
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Abstract
A printed container for food packaging, particularly a heat-resistant printed container for food packaging which can be subjected to heat sterilization and heat cooking, can be produced by a process which comprises winding, around the side of a container main body, a label consisting of a transparent heat-shrinkable resin film having a cylindrical shape whose circumference is slightly larger than the circumference of said side and further having a print at the inner side, and then carrying out: a step of subjecting said heat-shrinkable resin film to heat shrinkage, and a step of melt-bonding a part of the heat-shrinkable resin film to the container main body.
Claims7
A process for producing a photo-printed heat resistant resin container for food packaging having a main body, comprising:
- winding around the side of said container main body, a label consisting of a transparent heat-shrinkable resin film having a shrinkage factor of about 5 to about 55% at temperatures between 90.degree.-120.degree. C. and having a cylindrical shape whose circumference is slightly larger than the circumference of said side and further having a print at its inner side;
- subjecting said heat-shrinkable resin film to heat shrinkage;
- and
- melt-bonding a part of the heat-shrinkable resin film to the container main body;
- wherein at least an outermost layer of the side of the container main body consists of a heat resistant resin layer having a heat deformation temperature of 80.degree. C. or higher;
- and
- wherein the heat-shrinkable resin film is melt-bondable to the heat resistant resin layer by ultrasonic wave and the melt-bonding step is effected by ultrasonic wave after or simultaneously with the heat shrinkage step.
Dependencies are inferred from the claim text.