Pulp fibrous accumulated sheet and method for producing pulp fibrous accumulated sheet

Abstract

Provided is a palp fibrous accumulated sheet including: a liquid permeable pulp fibrous accumulated layer containing a crushed pulp or base-fibers mainly including a crushed pulp, and a binder; and a plurality of fiber crimped parts formed by compression and pressurization, the fiber crimped parts being formed so that crushed pulp fibers each straddling the adjacent fiber crimped parts are present.

1 . A pulp fibrous accumulated sheet, comprising:
 a liquid permeable pulp fibrous accumulated layer comprising a crushed pulp or base-fibers mainly including a crushed pulp, and a binder,   wherein the pulp fibrous accumulated sheet has a plurality of fiber crimped parts formed by compression and pressurization, and   the fiber crimped parts are formed such that at least one crushed pulp fiber straddles adjacent fiber crimped parts.   
     
     
         2 . The pulp fibrous accumulated sheet according to  claim 1 , wherein the binder is included in an amount of from 1 to 20% by weight with respect to the liquid permeable pulp fibrous accumulated layer. 
     
     
         3 . The pulp fibrous accumulated sheet according to  claim 1 , wherein the binder comprises carboxylmethyl cellulose. 
     
     
         4 . The pulp fibrous accumulated sheet according to  claim 1 , wherein the binder comprises a polyvinyl alcohol. 
     
     
         5 . The pulp fibrous accumulated sheet according to  claim 1 , wherein the pulp fibrous accumulated sheet is impregnated with a chemical composition such that the pulp fibrous accumulated sheet is in a wet state. 
     
     
         6 . The pulp fibrous accumulated sheet according to  claim 1 , wherein the binder is crosslinked. 
     
     
         7 . The pulp fibrous accumulated sheet according to  claim 1 , wherein the plurality of fiber crimped parts are formed by embossing. 
     
     
         8 . A method for producing a pulp fibrous accumulated sheet, comprising:
 forming a fibrous accumulated body on a mesh body by subjecting accumulating a crushed pulp or base-fibers mainly including a crushed pulp by aspiration;   compressing and pressurizing the fibrous accumulated body such that a plurality of fiber crimped parts are formed on the fibrous accumulated body and that at least one crushed pulp fiber straddles adjacent fiber crimped parts;   applying a binder onto at least one surface of the fibrous accumulated body on which the fiber crimped parts have been formed; and   drying the fibrous accumulated body after the applying of the binder to form a liquid permeable pulp fibrous accumulated layer.   
     
     
         9 . The method according to  claim 8 , wherein the applying of the binder comprises applying the binder onto both surfaces of the fibrous accumulated body. 
     
     
         10 . The method according to  claim 8 , wherein the compressing and pressurizing are conducted by means of an emboss roll. 
     
     
         11 . The method according to  claim 10 , further comprising:
 pressurizing the fibrous accumulated body by planar rolls before the compressing and pressurizing by the emboss roll.   
     
     
         12 . The method according to  claim 8 , wherein the drying comprises drying with electromagnetic wave. 
     
     
         13 . The method according to  claim 8 , wherein the binder comprises carboxylmethyl cellulose. 
     
     
         14 . The method according to  claim 8 , wherein the binder comprises a polyvinyl alcohol. 
     
     
         15 . A method for producing a pulp fibrous accumulated sheet, comprising:
 applying a binder onto base-fibers from a first direction, and adsorbing the base-fibers along the first direction; and   applying a binder onto the base-fibers from a second direction, which is different from the first direction, and adsorbing the base-fibers along the second direction.   
     
     
         16 . The method according to  claim 15 , wherein
 the applying of the binder from the second direction comprises applying the binder to a bottom surface of the base-fibers, and   the adsorbing of the base-fibers along the second direction comprises adsorbing the base-fibers from an upper surface of the base-fibers.   
     
     
         17 . The method according to  claim 15 , further comprising:
 transporting the base-fibers by adsorbing an upper surface of the base-fibers via a contact element that is in contact with the upper surface.   
     
     
         18 . The method according to  claim 15 , further comprising:
 feeding a gas along the first direction prior to the applying of the binder from the second direction.   
     
     
         19 . The method according to  claim 15 , further comprising:
 feeding a gas along the second direction after the applying of the binder from the second direction.   
     
     
         20 . The method according to  claim 15 , further comprising:
 pressurizing the base-fibers prior to the applying of the binder from the first direction.   
     
     
         21 . The method according to  claim 15 , further comprising:
 removing static electricity in the base-fibers.