Paper straw

Abstract

A paper straw 10 is comprised of an elongated paper tube 30 and a bending structure 20 composed in the tube 30. The bending structure 20 is comprised of a plural stiff part 21 and a plural soft part 22 alternately turn around thereof and make a tubular form. The paper tube is made from paper or the material made from plant. The stiff part 21 may have a large thickness and the soft part 22 may have a smaller thickness.

1 . A paper straw comprising;
 an elongated paper tube;   and a bending structure composed in the tube;   wherein said bending structure is comprised of stiff parts and soft parts alternately turn around thereof and form the tube.   
     
     
         2 . A paper straw comprising;
 an elongated paper tube;   and a bending structure composed in the tube;   wherein said bending structure is comprised of spiral stiff parts and spiral soft parts alternately turn around thereof and form the tube.   
     
     
         3 . The paper straw of  claim 1 ;
 wherein the thickness of the stiff part is larger than the thickness of the soft part.   
     
     
         4 . The paper straw of  claim 1 ;
 wherein the stiffness of the material of the stiff part is bigger than the stiffness of the material of the soft part.   
     
     
         5 . The paper straw of  claim 2 ;
 wherein the thickness of the stiff part is larger than the thickness of the soft part.   
     
     
         6 . The paper straw of  claim 2 ;
 wherein the stiffness of the material of the stiff part is bigger than the stiffness of the material of the soft part.