Patent ID: 6811530
Filing Date: 2004-11-02
Classification: B29C,B65B

Abstract:
A former for use in a bag manufacturing and bag filling packaging machine, comprising:a cylinder; a collar for guiding a film into the cylinder; and a former top, wherein a minimum radius of curvature of the former top along a film guiding direction is equal to or greater than 0.27 mm, a maximum radius of curvature of the former top along the film guiding direction is equal to or smaller than 0.50 mm, the average surface roughness of the former top is less than 10 &mgr;m, and the number of high projections per unit length of 10 mm of the former top along a width direction of the film guided by the collar into the cylinder is less than five, the high projection being defined as a projection of the surface of the former top that is as tall as or taller than 5 times the average surface roughness of the former top.