Semisynthetic paper structure on a urea basis

A semisynthetic paper with low bulk comprises a continuous, chemically bonded, open fibre network formed by cellulosic vegetable fibres and fragments of urea-formaldehyde condensate, the fragments being precured before paper web formation and being cured a second time when drying the paper web. A method of producing a semisynthetic paper with low bulk comprises the steps of forming precured fragments of a urea-formaldehyde condensate, forming a stock of the fragments and cellulosic vegetable fibres, including in the stock a water-insoluble latent curing agent, forming a paper web from the stock, and drying the paper web, the fragments being cured a second time during the drying operation.

申请(专利)号: US19770835342
申请日期: 1977年9月21日
公开(公告)日: 1980年1月15日
公开(公告)号: US4183783(A)
主分类号: D21H13/10,D,D21,D21H,D21H13
分类号: D21H13/10,C05C9/02,D21H17/50,(IPC1-7):D21H3/54,D,C,(,D21,C05,(IP,D21H,C05C,(IPC,D21H13,C05C9,D21H17,(IPC1-7):D21H3
申请(专利权)人: SUNDEN, BIRGITTA,SUNDEN, OLOF
发明(设计)人: SUNDEN, BIRGITTA,SUNDEN, OLOF