FILM OF PLASTICS MATERIAL STRETCHED TO PRESENT A PRIVILEGED SHRINKAGE ORIENTATION, A HEAT-SHRINK SLEEVE MADE OUT OF THE FILM, AND AN ARTICLE COVERED IN SUCH A SLEEVE
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United States of America Patent
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Issued Date -
Jul 21, 2011
app pub date -
Jan 14, 2011
filing date -
Jan 15, 2010
priority date (Note) -
Abandoned
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Abstract
The invention relates to a film of plastics material stretched to present a privileged shrinkage orientation and used in particular for fabricating heat-shrink sleeves, the film including at least one line of mechanical weakness and at least one local region of extra thickness extending along the line of weakness so as to border it, the line of weakness and the adjacent local region of extra thickness together defining a tear line. According to the invention, the local region of extra thickness is constituted by applying liquid or semi-liquid material to the film, the applied material being applied to the film in a quantity that depends on the expected shrinkage ratio in the portion of the film that includes the tear line while a sleeve made using such a film is being heat-shrunk onto an article.
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