Also
in the 1970's, PEZ started packaging their dispensers
on blister packed cards, in addition to the cellophane
bags. This early card design consisted of a two-tone green
and yellow stripe pattern. The first carded dispensers
came with two candy packs, while the carded dispensers
in the late 70's had four packs per card.
On
a technical note... blister-packed product is manufactured
in the following manner. The backing cards are printed
in multiples on a large sheet of cardstock. These sheets
are run through a die cutter that cuts the cards into
individual pieces. The plastic blister is a vacuum-formed
and molded piece. A web (spool) of thin plastic is fed
into a machine that has multiple mold cavities, with each
cavity in the shape of the blister pocket. The plastic
sheet is fed in, and the mold die halves clamp together.
As heat is applied, a vacuum is pulled in the mold to
make sure that the plastic sheet is completely pulled
into all of the molded reliefs of the die. When the mold
opens, a complete sheet of multiple blisters is dropped
out. These molded plastic sheets are then placed into
another die cutter that cuts the sheet into each individual
blister.
Next
the single blister pieces are placed onto an indexing
conveyor with the blister upside down. As the conveyor
indexes, the blisters are conveyed along to an operator
who places a dispenser and the candy packs into the blister.
The filled blisters are then conveyed into a sealing machine.
As the blisters pass, a film of glue is placed onto the
surfaces that will contact the backing card. Also in the
sealing machine is a stack of the die cut backing cards,
loaded in a magazine. A single backing card is kicked
out, and positioned on top of the ready blister.
The
completed package is then conveyed into a press, and a
platen presses the backing card onto the blister. Heat
is applied that helps the glue to stick and causes it
to cure. The final sealed blister pack is then discharged
onto another conveyor that takes it to a secondary case
packing area.
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