Patent ID: 9387642
Filing Date: 2016-07-12
CPC Classification: B29C,B31B,B65D,D21H

Claim Text:
1. A process for manufacturing a heat insulation container, consisting of the following steps in order: (a) preparing a coating material by mixing and blending a binder and a thermo-expandable powder consisting of a plurality of thermo-expandable microcapsules, the binder being selected from a group consisting of polyvinyl acetate resin, ethylene vinyl acetate resin, polyurethane resin and a mixture thereof, a weight ratio of the binder to the thermo-expandable powder being 80:20 to 95:5, each thermo-expandable microcapsule consisting of a thermoplastic polymer shell and a solvent wrapped by the thermoplastic polymer shell, the coating material being further mixed with a pigment; (b) coating the coating material on at least a part of an area specified on a continuous paper reel or a non-continuous paper sheet, and drying the paper reel or the paper sheet at a temperature which is lower than a soften point of the binder, wherein the binder, after drying, is normally non-free-flowing under the effect of gravity; (c) cutting the coated paper reel or the coated paper sheet into a desired-shaped sheet; (d) modeling the desired-shaped sheet to form a container with the coating material; (e) heating the container with the coating material to the soften point of the binder which is within a range of 80-160 degrees Celsius and lower than a boiling point of the solvent so that the binder has molecular flowability, wherein the binder is normally free-flowing under the effect of gravity under a temperature equal to or higher than the soften point of the binder; (f) further heating the container with the coating material to the boiling point of the solvent which is within a range of 80-160 degrees Celsius so that the solvent vaporizing to balloon the thermoplastic polymer shell, whereby the coating material attached on the container is foamed to form a foamed coating material on the container, wherein a volume of the thermo-expandable microcapsule which is expanded reaches 20-50 times that of the thermo-expandable microcapsule which is un-expanded.