Hydrolysable sheet

Abstract

A hydrolysable sheet obtained by impregnating a base paper sheet, to which a water-soluble binder is added, with a chemical solution, wherein the base paper sheet is obtained by applying a ply process to a plurality of sheets of base paper and has a basis weight of from 30 gsm to 150 gsm, wherein a compounding ratio of softwood pulp to hardwood pulp is less than 1/1, wherein the chemical solution contains a cross-linking agent, which causes the water-soluble binder to initiate a cross-linking reaction, and a trihydric or higher alcohol, and wherein, with respect to a weight of the base paper sheet, the base paper sheet is impregnated with the trihydric or higher alcohol at 1% to 20% by weight.

1 . A hydrolysable sheet obtained by impregnating a base paper sheet, to which a water-soluble binder is added, with a chemical solution, wherein
 the base paper sheet is obtained by applying a ply process to a plurality of sheets of base paper and has a basis weight of from 30 gsm to 150 gsm,   a compounding ratio of softwood pulp to hardwood pulp is less than 1/1,   the chemical solution contains a cross-linking agent, which causes the water-soluble binder to initiate a cross-linking reaction, and a trihydric or higher alcohol, and   with respect to a weight of the base paper sheet, the base paper sheet is impregnated with the trihydric or higher alcohol at 1% to 20% by weight.   
     
     
         2 . A hydrolysable sheet obtained by impregnating a base paper sheet, to which a water-soluble binder is added, with a chemical solution, wherein
 the base paper sheet is obtained by applying a ply process to a plurality of sheets of base paper and has a basis weight of from 30 gsm to 150 gsm,   a compounding ratio of softwood pulp to hardwood pulp is less than 2/3,   the chemical solution contains a cross-linking agent that causes the water-soluble binder to initiate a cross-linking reaction, and   with respect to a weight of the base paper sheet, the base paper sheet is impregnated with the chemical solution at 150% to 300% by weight.   
     
     
         3 . The hydrolysable sheet according to  claim 1 , wherein the base paper sheet is in a state in which a content of the water-soluble binder increases from inside towards a front surface and a back surface in a thickness direction of the base paper sheet. 
     
     
         4 . The hydrolysable sheet according to  claim 1 , wherein embossments are formed on an entire surface of the hydrolysable sheet. 
     
     
         5 . The hydrolysable sheet according to  claim 4 , wherein the embossments include
 first embossments and   second embossments arranged around the first embossments, a shape of a protruding part of each of the second embossments differing from a shape of a protruding part of each of the first embossments.   
     
     
         6 . The hydrolysable sheet according to  claim 5 , wherein the first embossments are arrayed in a rhomboid grid. 
     
     
         7 . The hydrolysable sheet according to  claim 5 , wherein each of the second embossments is arrayed between two of the first embossments. 
     
     
         8 . The hydrolysable sheet according to  claim 5 , wherein the first embossments contact the second embossments to form a conjoined embossment.