Method of producing a packaging material for a retortable package

摘要

A packaging material for a retortable package provided with decorative artwork includes a paper layer and outer, heat-resistant plastic coatings. In order to improve the printability of the paper layer, the surface of the paper layer intended for printing is coated with a composition of pigment, adhesive or binder and a substance possessing the capability of modifying the rheological properties of the coating.

主权项

1. A packaging material for a package of the type which is produced by fold forming and thermosealing and which, after filling and sealing is, for purposes of extending shelf-life, intended to be subjected to a heat treatment at elevated temperature and high relative humidity, the packaging material including a layer of paper whose one surface has a printable coating of pigment and adhesive or binder and decorative artwork of printing ink applied on the printable coating, as well as a recurring pattern of crease lines in register with said decorative artwork of printing ink, the printable coating also including a substance possessing the capability of modifying the rheological properties of the printable coating, wherein the composition of the printable coating includes an adhesive of a styrene acrylic copolymer in a quantity of 10-20% of the weight of the composition, pigment consisting of layered silicate mineral clay and calcium carbonate in an amount of 80-90% of the weight of the composition, and the substance possessing the capability of modifying the rheological properties of the printable coating being an acrylic copolymer in an amount of 0.1-1% of the weight of the composition.