Heat-foamable sheet, method for manufacturing the same, foaming filler member, and method for filling inner space of hollow member

Abstract

There are provided a foaming filler member which allows, even when the inner space of a hollow member has a protruding space, easy filling of the protruding space without using an extra member, a heat-foamable sheet used for the foaming filler member, a method for manufacturing the heat-foamable sheet, and a method for filling the inner space of the hollow member. A heat-foamable sheet which extends in one direction when heated at 100 to 130° C. for 20 minutes and has an extension ratio of 5 to 50% in the extension direction is manufactured by stretch-forming a heat-foamable material. Even when the inner space has the protruding space, the protruding space can be easily filled at low cost without using an extra member by using the heat-foamable sheet as the foaming filler member, disposing the foaming filler member in the main space of the inner space, and foaming it such that the extending direction of the heat-foamable sheet is oriented toward the protruding space.

1 . A heat-foamable sheet which extends in one direction when heated at 100 to 130° C. for 20 minutes and has an extension ratio of 5 to 50% in the extending direction. 
     
     
         2 . A heat-foamable sheet according to  claim 1 , which is formed by stretching a heat-foamable material. 
     
     
         3 . A heat-foamable sheet according to  claim 2 ,
 wherein the heat-foamable material contains a polymer as a main component and a foaming agent,   the heat-foamable sheet being formed by heating the heat-foamable material to a temperature less than a decomposition temperature of the foaming agent and rolling the heated heat-foamable material.   
     
     
         4 . A heat-foamable sheet according to  claim 2 , which is formed by calendering. 
     
     
         5 . A heat-foamable sheet according to  claim 4 , wherein
 the calendering uses:   a plurality of calender rolls arranged in adjacent relation to have respective nip portions formed therebetween; and   a draw roll disposed in downstream spaced-apart relation to the calender roll which is disposed most downstream in a direction of transport of the heat-foamable material,   in the adjacent calendar rolls each other, a rotating speed of the calender roll which is disposed downstream is set to be equal to or higher than a rotating speed of the calender roll which is disposed upstream, and a rotating speed of the draw roll is set to be equal to or higher than a rotating speed of the calender roll which is disposed most downstream.   
     
     
         6 - 12 . (canceled)