Paper making process utilizing an amphoteric mucous structure as binder.
Abstract
Abstract Translated from English Procede de fabrication de papier ayant des caracteristiques ameliorees de retention et de liaison du materiau de charge et de fibres de second grade. Il se caracterise par l'utilisation d'un compose muqueux amphotere comme liant. Ce compose est le produit de reaction entre de l'amidon cationique de faible densite de charge et un polymere anionique de densite de charge elevee comme la carboxymethyle cellulose, Le compose possede les caracteristiques amphoteres et de mucosite et devrait etre utilise pour la fabrication du papier, dans une structure transitoire unique. Cette structure se caracterise par des particules de materiau de remplissage renfermees et finement distribuees en gouttelettes du compose muqueux fortement hydrate mais sensiblement insolubles a l'eau. Selon l'invention, cette structure transitoire peut ulterieurement etre reorganisee en une structure d'un gel moins hydrate et plus resistant, renfermant toujours le materiau de remplissage. Cette structure de gel peut supporter les forces de drainage sur un fil metallique d'une machine a papier. Cette reorganisation de structure s'effectue par reaction de polymeres inorganiques colloidaux de charge en surface tres elevee comme l'acide polysilicique et des composes de polyaluminium. Le procede donne des papiers de resistances elevees et des retentions du materiau de charge superieures a 90% dans un seul passage du fil metallique meme avec des concentrations extremes de materiau de charge de 30 a 60% du poids du papier. A method of making paper having improved retention and bonding characteristics of filler material and second grade fibers. It is characterized by the use of an amphoteric mucosal compound as a binder. This compound is the reaction product between low charge density cationic starch and a high charge density anionic polymer such as carboxymethyl cellulose. The compound has amphoteric and mucositic characteristics and should be used for papermaking , in a single transient structure. This structure is characterized by particles of filler material enclosed and finely distributed in droplets of the highly hydrated but substantially water-insoluble mucosal compound. According to the invention, this transitional structure can subsequently be reorganized into a structure of a less hydrated and more resistant gel, still containing the filling material. This gel structure can withstand the drainage forces on a metal wire of a paper machine. This structural reorganization is carried out by reaction of colloidal inorganic polymers with a very high surface charge such as polysilicic acid and polyaluminum compounds. The process yields papers of high strengths and filler material retentions greater than 90% in a single pass of the wire even with extreme filler concentrations of 30 to 60% of the paper weight.
Inventors
- 👤 Agneta E Sunden
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