Appeal No. 2002-1803
Application 09/288,775
upstream of the nip, and a program controller 20 for regulating
the operation of the apparatus. The program controller operates
to cause (1) the drive roll means to periodically advance the
webs from the supply rolls through the nip while the first heat
sealing means seals together the longitudinal edges of the webs,
(2) the nozzle to periodically introduce a foamable composition
between the webs upstream of the nip, and (3) the second heat
sealing means to periodically seal the top edge of a formed bag
and the bottom edge of the next bag while severing the formed bag
from the next bag.
Sperry’s bag forming apparatus and method are specifically
designed for use in a packaging production line (see column 2,
lines 14 through 18; and column 6, line 8 et seq.). In general,
a severed cushion is dropped from the apparatus into a shipping
container, the articles being packaged are disposed on top of the
cushion, and an additional severed cushion is dropped onto the
articles. Both cushions are severed and dropped into the
container before the composition therein has completely foamed.
This allows the cushions to deform into a surrounding and
conforming relationship with the articles when the container is
closed and sealed, and to further expand about the articles and
4
Page: Previous 1 2 3 4 5 6 7 8 Next
Last modified: November 3, 2007