Base sheet for wallcoverings
AssigneeDomtar Inc.
InventorHarold Freeburn
Life of this patent
Estimating the term…
Abstract
A paper-based sheet for wallcoverings that is made in a single pass on a standard paper making machine is described. The sheet has a print side and a barrier side and is made from softwood pulp in an amount of about 15% to about 40% by dry weight; hardwood pulp in an amount of about 30% to about 55% by dry weight; and, mineral filler in an amount of about 15% to about 30% by dry weight. A first coating is applied to the print side of the sheet in an amount of about 5 to about 20 gm/m2 dry weight. A second coating is applied to the barrier side of the sheet in an amount of about 2.5 to about 10 gm/m2 dry weight. The advantage is a strong, durable, alkaline wallcovering that is less expensive to produce, and provides a smooth print surface.
Claims33
A base sheet for wallcoverings, comprising:
- a) an unsaturated paper substrate having a print side and a barrier side and comprising:
- i) softwood pulp in an amount of about 15% to about 40% by dry weight;
- ii) hardwood pulp in an amount of about 30% to about 55% by dry weight;
- and
- iii) mineral filler in an amount of about 15% to about 30% by dry weight;
- b) a first coating that includes a scrub resistance aid disposed on the print side of the paper substrate in an amount of about 5 to about 20 gm/m2 dry weight;
- and
- c) a second coating disposed on the barrier side of the paper substrate in an amount of about 2.5 to about 10 gm/m2 dry weight.
A method of making a base sheet for wallcoverings, comprising the steps of:
- a) forming an unsaturated paper substrate having a print side and a barrier side, the paper substrate comprising:
- softwood pulp in an amount of about 15% to about 40% by dry weight;
- hardwood pulp in an amount of about 30% to about 55% by dry weight;
- and mineral filler in an amount of about 15% to about 30% by dry weight;
- b) applying a first coating that includes a scrub resistance aid to the print side of the paper substrate in an amount of about 5 to about 20 gm/m2 dry weight;
- and
- c) applying a second coating to the barrier side of the paper substrate in an amount of about 2.5 to about 10 gm/m2 dry weight.
A base sheet for wallcoverings, comprising:
- a) a paper substrate having a print side and a barrier side and comprising:
- i) softwood pulp in an amount of about 15% to about 40% by dry weight;
- ii) hardwood pulp in an amount of about 30% to about 55% by dry weight;
- and
- iii) mineral filler in an amount of about 15% to about 30% by dry weight;
- and
- iv) less than 1% by weight each of a wet strength agent, a dry strength agent, and a sizing agent;
- b) a first coating disposed on the print side of the paper substrate in an amount of about 5 to about 20 gm/m2 dry weight, the first coating including a scrub resistance aid;
- and
- c) a second coating disposed on the barrier side of the paper substrate in an amount of about 2.5 to about 10 gm/m2 dry weight.
Dependencies are inferred from the claim text.