Cutting edge for packaging container and packaging container having the same

Abstract

A cutting edge 24 is divided into a center area 28 including a V-shaped apex portion, a pair of intermediate areas 29 on the outer sides thereof, and a pair of side areas 30 on the farther outer sides thereof. The center area 28 has first teeth with the highest tooth height and second teeth with a smaller tooth height, the first teeth being situated at the apex portion and the second teeth being situated between the first teeth at a prescribed spacing around them as the center. A first straight line connecting the tips of the first teeth, a second straight line connecting the tips of the second teeth and a third straight line connecting the bases of the first teeth and second teeth are parallel, the second straight line being located between the first straight line and third straight line. The tips of the intermediate teeth of the intermediate area 29 are located on the second straight line or between the second straight line and third straight line. The tips of the side teeth of the side area 30 are located on the second straight line or between the first straight line and second straight line.

1 . A cutting edge for a packaging container which is a non-metallic V-shaped cutting edge comprising a plurality of teeth, which is mounted on a packaging container housing a packaged roll and serves to cut the packaged roll, the cutting edge characterized by divided into a center area including the apex portion of the V-shape, a pair of side areas each including one of the ends of the V-shape, and a pair of intermediate areas each sandwiched between the pair of side areas and the center area,
 wherein the center area with a plurality of first teeth all having the same tooth height which is the greatest tooth height and a plurality of second teeth all having the same tooth height which is less than the height of the first teeth, wherein one of the first teeth is situated at the apex portion while the rest of the first teeth are arranged at prescribed intervals centering around the first tooth at the apex portion, and the second teeth are arranged to alternate between the first teeth, wherein a first straight line connecting the tips of the first teeth, a second straight line connecting the tips of the second teeth and a third straight line connecting the bases of the first and second teeth are parallel to each other, the second straight line being located between the first straight line and the third straight line,   the intermediate areas with a plurality of intermediate teeth, the tips of the intermediate teeth being located on the second straight line or between the second straight line and the third straight line, and   the side areas with a plurality of side teeth, the tips of the side teeth being located on the second straight line or between the first straight line and the second straight line.   
     
     
         2 . A cutting edge for a packaging container according to  claim 1 , characterized in that at least one of the tips of the side teeth is directed further outward than the tips of the first teeth, the second teeth and the intermediate teeth. 
     
     
         3 . A cutting edge for a packaging container according to  claim 1 , characterized in that the tooth heights of the side teeth are equal to or greater than those of the second teeth and smaller than those of the first teeth. 
     
     
         4 . A cutting edge for a packaging container which is a non-metallic V-shaped cutting edge comprising a plurality of teeth, which is mounted on a packaging container housing a packaged roll and serves to cut the packaged roll, the cutting edge characterized by divided into a center area including the apex portion of the V-shape, a pair of side areas each including one of the ends of the V-shape, and a pair of intermediate areas each sandwiched between the pair of side areas and the center area,
 wherein the center area with a plurality of first teeth all having the same tooth height which is the greatest tooth height and a plurality of second teeth all having the same tooth height which is less than the height of the first teeth, wherein one of the first teeth is situated at the apex portion while the rest of the first teeth are arranged at prescribed intervals centering around the first tooth at the apex portion, and the second teeth are arranged to alternate between the first teeth, wherein a first straight line connecting the tips of the first teeth, a second straight line connecting the tips of the second teeth and a third straight line connecting the bases of the first and second teeth are parallel to each other, the second straight line being located between the first straight line and the third straight line,   the intermediate areas with a plurality of intermediate teeth, the tips of the intermediate teeth being located on the second straight line or between the second straight line and the third straight line, and   the side areas with a plurality of side teeth, the tips of at least one of the side teeth being directed further outward than the tips of the first teeth, the second teeth and the intermediate teeth.   
     
     
         5 . A cutting edge for a packaging container according to  claim 1 , characterized in that the intermediate areas have two different sizes of the intermediate teeth with different tooth heights, alternately arranged. 
     
     
         6 . A cutting edge for a packaging container according to  claim 1 , characterized in that the tooth heights of the intermediate teeth are equal to or lower than those of the second teeth. 
     
     
         7 . A cutting edge for a packaging container according to  claim 1 , characterized in that at least one of the oblique lines of the first teeth, the second teeth, the intermediate teeth and the side teeth is an inwardly recessed arc-shape. 
     
     
         8 . A packaging container comprising a cutting edge according to  claim 1  on the back side of the front wall of the cover. 
     
     
         9 . A packaging container according to  claim 8 , wherein the cutting edge is attached to the back side of the front wall of the cover via a modified polyethylene resin. 
     
     
         10 . A cutting edge for a packaging container according to  claim 1 , characterized in that the side areas have two different sizes of the side teeth with different tooth heights, alternately arranged. 
     
     
         11 . A cutting edge for a packaging container according to  claim 2 , characterized in that the side areas have two different sizes of the side teeth with different tooth heights, alternately arranged. 
     
     
         12 . A cutting edge for a packaging container according to  claim 4 , characterized in that the side areas have two different sizes of the side teeth with different tooth heights, alternately arranged. 
     
     
         13 . A cutting edge for a packaging container according to  claim 4 , characterized in that the intermediate areas have two different sizes of the intermediate teeth with different tooth heights, alternately arranged. 
     
     
         14 . A cutting edge for a packaging container according to  claim 4 , characterized in that the tooth heights of the intermediate teeth are equal to or lower than those of the second teeth. 
     
     
         15 . A cutting edge for a packaging container according to  claim 4 , characterized in that at least one of the oblique lines of the first teeth, the second teeth, the intermediate teeth and the side teeth is an inwardly recessed arc-shape. 
     
     
         16 . A packaging container comprising a cutting edge according to  claim 4  on the back side of the front wall of the cover. 
     
     
         17 . A packaging container according to  claim 16 , wherein the cutting edge is attached to the back side of the front wall of the cover via a modified polyethylene resin.