Method of and device for fabricating plastic sleeves
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United States of America Patent
Stats
-
Feb 17, 1981
Grant Date -
N/A
app pub date -
Nov 13, 1978
filing date -
Dec 19, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A plastic sleeve is fabricated by: winding a blank of plastic film around a hollow cylindrical mandrel having a groove of arcuate cross section extending in the mandrel axial direction along the mandrel outer surface and having numerous through holes through its wall including the concave surface of the groove, the blank ends being overlapped; applying a vacuum through the holes to the inner surface of the blank thereby to draw it by suction tightly against the mandrel outer surface; heat sealing the overlapped ends of the blank thereby to form a sleeve; and vitiating the vacuum and applying pressure above atmospheric to the inner surface of the sleeve thereby to facilitate the succeeding step of stripping the sleeve from the mandrel and fitting it on a glass bottle.
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