Pad, production method thereof and adhesive bandage using said pad

Abstract

A pad comprising an approximate-quadrangular portion and approximate-arched portions attached to both lateral sides of the approximate-quadrangular portion and all the periphery of said pad is sealed with ultrasonic treatment wherein: when L represents the length of the approximate-quadrangular portion in the direction parallel to the lateral axis, S represents the length of the approximate-quadrangular portion in the direction parallel to the vertical axis and R represents a radius of said approximate-arched portion, following relations are satisfied: 0.5S:≦L≦4S between L and S; 0.5S≦R≦S between S and R, the production method and the adhesive bandage using said pad. The pad prevents peeling-off from four corners thereof and intrusion of water.

1 . A pad comprising an approximate-quadrangular portion and approximate-arched portions attached to both lateral sides of the approximate-quadrangular portion and all the periphery of said pad is sealed with ultrasonic treatment wherein: 
 when L represents the length of the approximate-quadrangular portion in the direction parallel to the lateral axis, S represents the length of the approximate-quadrangular portion in the direction parallel to the vertical axis and R represents a radius of said approximate-arched portion, following relations are satisfied:   0.5 S≦L≦ 4 S between L and S 0.5 S≦R≦S  between S and R.   
     
     
         2 . The pad according to  claim 1  wherein the relation of L and S is as follows: 
       0.9 S≦L≦ 1.6 S   
     
     
         3 . The pad according to  claim 1  or  2  wherein the relation of R and S is as follows: 
       0.55 S≦R≦ 0.9 S   
     
     
         4 . The pad according to  claim 3  wherein the relation of R and S is as follows: 
       0.6 S≦R≦ 0.8 S   
     
     
         5 . The pad according to any one of  claims 1  to  4  which is composed of a nonwoven fabric.  
     
     
         6 . The pad according to  claim 5  wherein said nonwoven fabric contains two kinds of filaments composed of one or more than two materials selected from the group consisting of rayon, polyethylene, polyesters and polypropylene.  
     
     
         7 . The pad according to any one of  claims 1  to  6  wherein the surface of said pad is covered with a polymer net.  
     
     
         8 . The pad according to any one of  claims 1  to  7  wherein edges of said pad are rounded.  
     
     
         9 . The pad according to any one of  claims 1  to  8  wherein said pad is used for an adhesive bandage.  
     
     
         10 . An adhesive bandage using the pad according to  claim 9 .  
     
     
         11 . A production method of a pad comprising an approximate-quadrangular portion and approximate-arched portions attached to both lateral sides of the approximate-quadrangular portion made up with a nonwoven fabric and the surface of said pad being covered with a polymer net: and 
 when L represents the length of the approximate-quadrangular portion in the direction parallel to the lateral axis, S represents the length of the approximate-quadrangular portion in the direction parallel to the vertical axis and R represents a radius of said approximate-arched portion, following relations are satisfied:   0.5 S≦L≦ 4 S  between L and S0.5 S≦R≦S  between S and R.   wherein the nonwoven fabric and the polymer net of the whole periphery of said pad are sealed and cut simultaneously by ultrasonic heating.    
     
     
         12 . A production method of a pad comprising an approximate-quadrangular portion and approximate-arched portions attached to both lateral sides of the approximate-quadrangular portion made up with a nonwoven fabric and the surface of said pad being covered with a polymer net: and 
 when L represents the length of the approximate-quadrangular portion in the direction parallel to the lateral axis, S represents the length of the approximate-quadrangular portion in the direction parallel to the vertical axis and R represents a radius of said approximate-arched portion, following relations are satisfied:   0.5 S≦L≦ 4 S  between L and S0.5 S≦R≦S  between S and R.   wherein the nonwoven fabric and the polymer net of the whole periphery of said pad is sealed by ultrasonic heating, and then the sealed peripheral portion is cut by ultrasonic heating.    
     
     
         13 . A production method of a pad comprising an approximate-quadrangular portion and approximate-arched portions attached to both lateral sides of the approximate-quadrangular portion made up with a nonwoven fabric and the surface of said pad being covered with a polymer net: and 
 when L represents the length of the approximate-quadrangular portion in the direction parallel to the lateral axis, S represents the length of the approximate-quadrangular portion in the direction parallel to the vertical axis and R represents a radius of said approximate-arched portion, following relations are satisfied:   0.5 S≦L≦ 4 S  between L and S0.5 S≦R≦S  between S and R.   wherein the nonwoven fabric and the polymer net on the pad surface are point-sealed, then the nonwoven fabric and the polymer net of the whole periphery of said pad is sealed by ultrasonic heating, and then the sealed peripheral portion is cut by ultrasonic heating.