Production of patterned paper
AssigneeThe Wiggins Teape Group Limited
InventorsEdward Charles Small, Brian Edward Evans
Life of this patent
Estimating the term…
Abstract
Speckle-patterned paper is produced on the paper machine without the use of printing techniques by first preparing speckle-forming material and then introducing this into a contrasting color papermaking furnish. Paper is then made from the speckle-containing furnish in the normal way. The speckle-forming material is produced either by agglomerating a mixture of papermaking fiber, particulate pigment and, preferably, a latex or other binder or by dry comminution of cellulose fiber aggregates in the form of paper or entangled fiber clumps.
Claims17
A process for the production of patterned paper, said process comprising the steps of:
- (1) preparing speckle-forming material by either:
- (A) agglomerating a mixture comprising papermaking fibre, particulate pigment, and a latex or other binder in an amount of up to about 20% by weight, based on the weight of dry latex or other binder to weight of dry fibre in the speckle-forming mixture, by the addition to the mixture of at least one polyelectrolyte flocculant, polyelectrolyte coagulant or other polyelectrolyte agglomerating agent;
- or
- (B) dry comminution of cellulose fibre aggregates;
- (2) introducing the resulting speckle-forming material into a papermaking furnish having fibres of a contrasting colour to the colour of the speckle-forming material and in which dye, if present, has been fully fixed;
- and
- (3) draining the speckle-containing furnish to produce a patterned paper web.
Dependencies are inferred from the claim text.