Plaster board panels
First Claim
1. A plaster board panel consisting essentially of a gypsum core having two sides, faced by a cardboard sheet on each side of the gypsum core, each sheet having a plurality of cardboard sheet layers, and one of said layers being the outermost layer, wherein at least the outermost cardboard sheet layer on one of the two sides contains 90 to 10% by weight of cellulose containing fibers, and from 10 to 90% by weight of polyolefin fibrides, relative to dry matter.
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Accused Products
Abstract
Plaster board panels wherein at least the top layer of one of the two cardboard sheets contains polyolefin fibrides can be easily dehydrated during their manufacture because of the porosity of the cardboard sheets. The finished panels have a substantially sealed surface of low porosity which is resistant to wet treatment and thus suitable for the application of various painting and coating systems.
69 Citations
23 Claims
- 1. A plaster board panel consisting essentially of a gypsum core having two sides, faced by a cardboard sheet on each side of the gypsum core, each sheet having a plurality of cardboard sheet layers, and one of said layers being the outermost layer, wherein at least the outermost cardboard sheet layer on one of the two sides contains 90 to 10% by weight of cellulose containing fibers, and from 10 to 90% by weight of polyolefin fibrides, relative to dry matter.
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12. A process for the manufacture of a plaster board panel consisting essentially of a gypsum core having two sides and a cardboard sheet bonded to each of the two sides of the gypsum core, the cardboard sheet including a plurality of cardboard sheet layers, comprising the steps of
introducing a gypsum paste between two cellulose containing cardboard sheets to form a panel, the outermost layer of at least one of the cardboard sheets containing from 90% to 10% by weight cellulose containing fibers and from 10 to 90% by weight polyolefin fibrides, relative to dry matter, and subjecting the panels to a heat treatment for a period of time and at a temperature sufficient to plastify the polyolefin fibrides.
Specification