Apparatus for manufacturing cylindrical tubes
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United States of America Patent
Stats
-
Apr 1, 1980
Issued Date -
N/A
app pub date -
Oct 4, 1977
filing date -
Mar 12, 1975
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for manufacturing cylindrical tubes from paper or similar fibrous materials. A layer of plastics material which becomes tacky when heated provided on a paper web is heated through the paper web then pressed against a plastics foil web with one edge of the plastics foil web extending beyond the corresponding edge of the paper web. The joined webs are wound helically onto a mandril with the extended edge of the plastics foil web overlapping a corresponding opposite second edge of the plastics foil web. A string of molten adhesive is applied along the extended edge on the mandril. The mandril is cooled to maintain the foil layer nearest the mandril below its melting temperature.
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