Bag manufacturing former laminated films
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United States of America Patent
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Nov 2, 2004
Grant Date -
Sep 9, 2004
app pub date -
Mar 6, 2003
filing date -
Mar 6, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A former is used to manufacture a bag in a packaging machine. The radius of curvature of the former top along a film guiding direction is between 0.27 mm and 0.50 mm, the average surface roughness of the former top is less than 10 .mu.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. The high projection is 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. It is found that the minimum radius of curvature of the former top should be equal to or larger than the critical radius that is defined by a radius of the curvature which causes an elastic limit strain at an innermost portion of a support layer of a laminated film immediately outside a barrier layer of the laminated film when the laminated film is bent over the former top. This makes it possible to effectively avoid undesired increase in oxygen transmission of the bag made of the laminated film.
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