Appeal No. 2001-1387
Application No. 08/715,210
portion remaining in the cap provides a moisture-
proof secondary liner. This liner is particularly
advantageous where wash-down operations are used.
Peeters discloses an induction seal closure 19 composed
of the following layers from top to bottom (see Figure 3):
polyethylene foam 20, wax 21, paper 22, aluminum foil 23,
paper 24, wax 25, polyethylene terephthalate 26 and LDPE 27.
In Peeters’ words,
[t]he adhesive power of the two wax layers 21
and 25 is sufficiently high to maintain good bonding
contact between adjacent layers. Thus, the seal
closure can be manufactured in a usual way by
bringing the different constituent layers in bonding
contact with each other, and then punching from a
roll of such material discs 19 as shown that can be
mounted in the caps.
The adhesive power of the two wax layers is
greatly reduced as the layers become heated by the
inductive heating of the aluminium [sic] foil. As a
matter of fact, the change-over from the solid to
the molten state causes the wax to become absorbed
by the paper layers, whereby said two wax layers
will allow easy separation of the layers kept
together by them.
The operation of closure 19 is as follows.
A screw cap as illustrated in Fig. 1 being
tightly screwed on a filled plastic container, the
aluminium [sic] foil 22 is inductively heated as
known in the art to heat layer 27 by heat-conduction
to a degree such that said layer melts and becomes
united with the annular top surface 9 of neck 15 of
the container. Heating of the aluminium [sic] foil
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