| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat shrinkable film formed with a perforated line that does not easily break by being applied with an impact, but appropriately breaks when it is intended to be broken. <P>SOLUTION: A tubular shrinkable film 1 to fit on a PET bottle body is formed with a perforated line 10 for breaking from the upper end to the lower end. The perforated line 10 is formed by a perforated line forming blade including a circular base portion having a thickness of approximately 0.8 to 1.4 mm, and a number of wedgelike cutting blades serially formed along the circumferential edge of the base at a predetermined interval so as to protrude outwardly in the radial direction. The perforation is an approximately oval small hole formed so that its short-diameter direction is oriented along the formation of the perforated line 10 when the film is fitted onto the PET bottle body and heat shrunk, due to pulling a Y shape of the perforation by the heat shrinkage of the film. <P>COPYRIGHT: (C)2009,JPO&INPIT |
