Method and apparatus for converting plastic
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 16, 1998
Grant Date -
N/A
app pub date -
Sep 20, 1993
filing date -
Sep 20, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A tube-forming machine and process has a supply for delivering an elongate, folded, plastic web along a path of travel. The web may be clear polyethylene folded treated surface to treated surface. A cutting mechanism is positioned along the path including a hard cylindrical roll and a cutter having a cutting head and means to bias the head toward the roll. A rotatable sealing drum has a cylindrical web engaging surface delineating a further portion of the path. A set of circumferentially spaced flame-emitting nozzles are positioned adjacent the drum surface section. Each of the nozzles includes a tip disposed within the cylinder delineated by said drum surface and has an axis disposed in an imaginary radial plane. Each tip is directed radially upwardly to impinge its flame against portions of a web being fed along the path when such portions project from said drum surface. Each tip axis is at an angle from 90.degree. to 60.degree. with an imaginary line located by the intersection of such imaginary plane with said drum surface section with the 60.degree. orientation of the tip axis being canted toward the drum. Preferably each tip axis is canted toward the drum at an angle of from 65.degree. to 68.degree. with said imaginary line.
First Claim
Other Claims data not available