Elastic product

Abstract

A new elastic product comprises expanded particles having an average diameter of 0.1 to 1.0 mm and a bag which is made of a two-way tricot fabric 0.3 to 1.5 mm in thickness and in which the particles are packed, wherein a rectangular test specimen of the tricot fabric having a size of 16 cm in the warp direction and a size of 2.5 cm in the fill direction shows an extension percentage of 250 to 300% when a tension of 1 kilogram-force is applied to the test specimen in the warp direction. The bag of the new elastic product has increased stretchability, which permits large deformation, and the inner filling material has increased fluidity so that an odd sound can be prevented when the product is deformed.

What is claimed is:  
     
         1 . An elastic product, comprising: expanded particles having an average diameter of 0.1 mm to 1.0 mm; and a bag which comprises a two-way tricot fabric with a thickness of 0.3 mm to 1.5 mm and in which the particles are packed, wherein a rectangular test specimen of the tricot fabric having a size of 16 cm in a warp direction and a size of 2.5 cm in a fill direction shows an extension percentage of 250% to 300% when a tension of 1 kilogram-force is applied to the test specimen in the warp direction.  
     
     
         2 . The elastic product according to  claim 1 , wherein the two-way tricot fabric has a warp knitted (tricot) structure of a nylon or polyester yarn in which a polyurethane yarn is inserted.  
     
     
         3 . The elastic product according to  claim 2 , wherein the two-way tricot fabric comprises 90% to 75% by weight of a nylon or polyester yarn and 10% to 25% by weight of a polyurethane yarn.  
     
     
         4 . The elastic product according to  claim 1 , wherein the expanded particles are a product produced by pre-expansion of raw beads, wherein surfaces of 100 parts by weight of the raw beads are coated with 0.5 to 1.5 parts by weight of a flow-promoting agent.  
     
     
         5 . The elastic product according to  claim 4 , wherein the flow-promoting agent is a metal salt of a fatty acid.  
     
     
         6 . The elastic product according to  claim 1 , wherein a metal film is formed on a surface of the two-way tricot fabric.  
     
     
         7 . The elastic product according to  claim 6 , wherein the metal film is made of any one of aluminum, stainless steel and titanium.  
     
     
         8 . The elastic product according to  claim 7 , wherein the metal film is a titanium film with a thickness of 50 Å to 2000 Å.  
     
     
         9 . An elastic product, comprising: a plurality of the elastic products each according to  claim 1;  and a housing bag in which the plurality of the elastic products are packed.  
     
     
         10 . The elastic product according to  claim 9 , wherein the elastic products are each substantially cylindrical and arranged in such a manner that their axial directions will be perpendicular to a height direction of a user.  
     
     
         11 . The elastic product according to  claim 10 , wherein part of a back face of the housing bag is connected to part of a front face of the housing bag so that the space for holding the respective elastic products is divided in the height direction of the user.  
     
     
         12 . The elastic product according to  claim 10 , wherein a user-facing upper portion of the housing bag comprises a highly stretchable portion, which is divided in the height direction of the user by a portion lacking in stretchability.  
     
     
         13 . The elastic product according to  claim 1 , further comprising a boundary portion formed therein for inhibiting a shift of the expanded particles in a height direction of a user, wherein the elastic product is for independent use in a housing bag.