Method of making a laminated sheet product
AssigneeImperial Chemical Industries PLC
InventorGraham E. Martin
Life of this patent
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Abstract
Sheet products are made from amino-aldehyde, e.g. urea-formaldehyde, resin fibres in admixture with other non-cellulosic fibres, e.g. glass fibres, and optionally cellulosic fibres. Multiply products may be made from plies having the above constitution and plies of, for example, amino-aldehyde resin fibres, alone or in admixture with cellulosic and/or non-cellulosic fibres. The paper-like sheet materials may be used e.g. as filter papers. Laminated products may be made by pressing at an elevated temperature, a stack of plies of paper made from a mixture of amino-aldehyde resin fibres and another fibrous material, e.g. cellulosic fibres.
Claims9
A method of making a laminated sheet product comprising the steps of:
- (a) forming fibers from an amino-aldehyde resin;
- (b) curing said fibers by heating at between 80.degree. C. and 200.degree. C. until said fibers have a degree of cure between 50% and 96%;
- (c) forming said cured fibers, in admixture with fibers other than amino-aldehyde resin fibers having a degree of cure below 96%, into paper, the fibrous material of said paper containing 10% to 90% by weight of said amino-aldehyde resin fibers having a degree of cure between 50% and 96%;
- (d) forming a stack containing superimposed plies of said paper;
- and
- (e) pressing said stack at a temperature of at least 100.degree. C., the pressing conditions being such that said amino-aldehyde resin fibers having a degree of cure between 50% and 96% fuse to bond together adjacent plies.
Dependencies are inferred from the claim text.