Manufacturing process of a paper substrate intended to be vulcanised or parchmentised

Abstract

A manufacturing process of a paper substrate intended to be vulcanised or parchmentised, consisting in: subjecting, in a dry state, the cellulose fibres to energy radiation; defiberizing and refining in an aqueous environment the irradiated fibres until a homogenous fibre solution is obtained; forming a web from the obtained fibre suspension, which is then drained and dried to obtain the actual paper substrate.

1 . A manufacturing process of a paper intended to be vulcanised or parchmentised comprising the steps of:
 separating and refining in an aqueous environment cellulose fibres contained in a mixture of fibres until a homogenous fibre suspension is obtained,   forming a web from the suspension, which is next drained and dried until the actual paper substrate has been obtained, and   lowering the degree of depolymerisation of the fibres by exposing the paper substrate to energy radiation.   
     
     
         2 . A process according to  claim 1 , wherein the mixture of fibres contains at least 20%, preferably at least 50% by weight, most preferably 100% by weight of the cellulose fibres. 
     
     
         3 . A process according to  claim 1 , wherein the cellulose fibres are exclusively virgin cotton fibres coming from sheets or compressed pulp. 
     
     
         4 . A process according to  claim 1 , wherein the cotton fibres, defiberized and then refined in an aqueous environment, come from textile waste. 
     
     
         5 . A process according to  claim 4 , wherein the textile waste comes from jeans industry. 
     
     
         6 . A process according to  claim 1 , wherein the fibre suspension contains 100% by weight of cotton fibres. 
     
     
         7 . A process according to  claim 1 , wherein the energy radiation is a radiation by electron beams. 
     
     
         8 . A process according to  claim 6 , wherein, when the paper is intended to be vulcanised, the radiation dose absorbed by the cotton fibres is between 10 and 50 kGy. 
     
     
         9 . A process according to  claim 6 , wherein, when the paper is intended to be vulcanised, the degree of polymerisation of the irradiated cotton fibres is less then 700, advantageously between 200 and 300. 
     
     
         10 . A process according to  claim 6 , wherein, when the paper is intended to be parchmentised, the degree of polymerisation of the irradiated cotton fibres making up the obtained paper sheet is between 400 and 600, advantageously 500. 
     
     
         11 . A process according to  claim 6 , wherein, when the paper is intended to be parchmentised, the irradiation dose absorbed by the cotton fibres is between 5 and 30 kGy.