Paper sheet, process for preparing same and applications thereof particularly as product for substituting impregnated glass webs
AssigneeArjomari-Prioux
InventorPierre Fredenucci
Life of this patent
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Abstract
The invention relates to a paper sheet obtained essentially from (parts by dry weight) ______________________________________ Fibers (cellulosic and 20 to 40 "basic mixture" non-cellulosic) Fillers 80 to 60 Latex 40 to 105 ______________________________________ in particular by a process of double flocculation, which has a very high resistance to delamination. The invention is applicable to floor and wall coverings.
Claims19
A paper sheet which contains, in parts by dry weight, 40 to 105 parts of latex and 100 parts of a basic mixture comprising 60 to 40 parts of cellulosic fibers having an SR of 15-35 and non-cellulosic fibers including short inorganic fibers, said short inorganic fibers being glass fibers and representing 40 to 90% by dry weight of said cellulosic fibers, and said sheet having a dimensional stability of not more than 0.13%, and a resistance to delamination of greater than 350 g/cm, and wherein the fillers or flocculant are not calcium hydroxide.
A paper sheet which contains, in parts by dry weight;
- 40 to 105 parts of latex and 100 parts of a basic mixture comprising 60 to 80 parts of fillers and 20 to 40 parts of cellulosic fibers having a SR of 15-35 and non-cellulosic fibers, said non-cellulosic fibers being glass fibers and representing 40 to 60% by dry weight of said cellulosic fibers, said sheet having a dimensional stability of not more than 0.13% and a resistance to delamination of greater than 350 g/cm, and wherein said sheet does not contain calcium hydroxide as a flocculant or filler.
A process for manufacturing a paper sheet having a dimensional stability of not more than 0.13% and a resistance to delamination of at least 350 g/cm, in a paper-making machine having a headbox downstream of a chest, said process comprising the steps of preparing an aqueous dispersion by adding successively the following components;
- 20 to 40 parts by dry weight of a fibrous mixture comprising cellulosic fibers refined between 15 and 35 SR and glass fibers in a content representing 40-60% in weight of said cellulosic fibers;
- 60 to 80 parts by dry weight of fillers so as to obtain 100 parts of a basic mixture containing said fibrous mixture and said fillers;
- a first addition of a flocculating amount of flocculant;
- 40 to 105 parts by dry weight of latex selected from acrylic and preferably vinyl styrene-butadiene copolymers, particularly vinyl chloride/ethylene/vinyl acetate copolymer or plasticized acrylate/vinyl chloride copolymer;
- a second addition of a flocculating amount of flocculant in said chest;
- and
- a third addition of a flocculating amount of flocculant in said headbox, and of passing said aqueous dispersion on said paper-making machine and wherein calcium hydroxide is not used as the filler or the flocculant.
Dependencies are inferred from the claim text.