Appeal No. 95-4113
Application No. 08/124,334
e) fusing the trimmed portions by directing a set of
circumferentially spaced flames produced by stoichiometric
mixtures of hydrogen and oxygen upwardly at an angle of from 90°
to 60° relative to the axis of drum rotation against the section
edge and the trimmed portions as they project from the section;
and,
f) causing the drum section to function as a heat
sink to maintain remaining portions of the web other than the
trimmed portions sufficiently cool to avoid distortion of the web
surface treatment and size modification of the remaining
portions.
23. A process of bonding plastic webs comprising:
a) passing a plurality of superposed webs over a
surface of a rotating metal drum while maintaining edge portions
of the webs outwardly of and projecting laterally from an edge of
the surface;
b) maintaining the webs under tension as they are
passed over the drum to maintain the webs in tight, non slip
relationship with the drum through tension alone and without any
hold down mechanism;
c) impinging a thin, highly intense flame on the edge
portions by directing it upwardly against the edge portions to
directly heat one of the edge portions while connectively heating
another edge portion shielded from the flame by the one edge
portion, the flame being emitted from a nozzle, including an
outlet tip portion having an axis disposed in a radial plane
33
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