Eco-friendly foaming sheet

Abstract

The present invention provides an eco-friendly foaming sheet. More particularly, the eco-friendly foaming sheet is fabricated using a biodegradable resin composition on a substrate, wherein the biodegradable resin composition is applied to the substrate sheet, a print layer is formed thereon, and the treated sheet is subjected to foaming. According to the present invention, without processes of preparing a sheet and foaming using a biodegradable resin, the biodegradable resin layer is directly applied to a substrate sheet as a subject to be used and foamed while forming a print layer, in addition, a chemical foaming agent and an eco-friendly plasticizer used together with the biodegradable resin are specifically defined to ensure desired flexibility, thereby fabricating an eco-friendly foaming sheet with high productivity.

1 . An eco-friendly foaming sheet fabricated using a biodegradable resin composition on a substrate sheet, wherein the biodegradable resin composition is applied to the substrate sheet to form a resin layer, a print layer is provided on the formed resin layer, and the treated sheet is subjected to foaming. 
     
     
         2 . The foaming sheet according to  claim 1 , wherein the resin layer is formed by T-die extrusion coating of the biodegradable resin composition on the substrate sheet. 
     
     
         3 . The foaming sheet according to  claim 2 , wherein the resin layer is formed to satisfy a thickness ranging from 0.01 to 50 mm. 
     
     
         4 . The foaming sheet according to  claim 1 , wherein the biodegradable resin composition includes a biodegradable resin, a chemical foaming agent and an eco-friendly plasticizer. 
     
     
         5 . The foaming sheet according to  claim 1 , wherein the substrate sheet is a vellum paper or non-woven fabric having an average weight of 80 to 200 g/m 2  and a thickness of 0.1 to 0.5 mm. 
     
     
         6 . The foaming sheet according to  claim 4 , wherein the biodegradable resin is at least one selected from a group consisting of; polylactic acid, polycondensed aliphatic biodegradable polyester, polycondensed copolymer aromatic biodegradable polyester, lactone resins, biodegradable cellulose ester, polypeptides, polyvinylalcohol, starches, cellulose, chitin/chitosan and natural linear polyester resins. 
     
     
         7 . The foaming sheet according to  claim 6 , wherein the biodegradable resin is a composite resin containing polylactic acid as a first resin, as well as at least one resin selected from a group consisting of poly(butylene succinate), polybutylene succinate/adipate copolymers, polybutylene adipate/terephthalate copolymers and ethylvinyl acetate, as a second resin. 
     
     
         8 . The foaming sheet according to  claim 7 , wherein the composite resin includes at least one second resin selected from a group consisting of polybutylene succinate, polybutylene succinate/adipate copolymers, polybutylene adipate/terephthalate copolymers and ethylvinyl acetate in an amount of 120 to 500 parts by weight, relative to 100 parts by weight of the first resin. 
     
     
         9 . The foaming sheet according to  claim 4 , wherein a biodegradable component including the biodegradable resin is 70% or more, relative to a total weight of the biodegradable resin composition. 
     
     
         10 . The foaming sheet according to  claim 4 , wherein the chemical foaming agent is at least one selected from azo-dicarboxylamide, benzenesulfonyl hydrazide, dinitroso pentamethylene tetramine, toluenesulfonyl hydrazide, azo-bis isobutyronitrile, barium azo-dicarboxylate and sodium bicarbonate, and is used in an amount of 1 to 10 parts by weight, relative to 100 parts by weight of the biodegradable resin composition. 
     
     
         11 . The foaming sheet according to  claim 4 , wherein the eco-friendly plasticizer is a citrate or sugar alcohol-based plasticizer and is used in an amount of 10 to 80 parts by weight, relative to 100 parts by weight of the biodegradable resin composition. 
     
     
         12 . The foaming sheet according to  claim 1 , wherein the foaming is executed in a chemical foaming mode at a temperature ranging from 120 to 250° C. 
     
     
         13 . The foaming sheet according to  claim 1 , further comprising an embossed layer over the print layer. 
     
     
         14 . The foaming sheet according to  claim 1 , wherein the print layer is prepared using the biodegradable resin by gravure printing, transfer printing, digital printing or rotary printing, and formed along unevenness of the resin layer in the foaming sheet.