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SHRINK FILM PACKAGING
Shrink packaging is a
relatively simple concept and procedure, using different types of
shrink film effectively displaying and protecting a variety of
products. Shrink films
have been oriented (stretched) during the manufacturing
process. They therefore
shrink upon being heated during the wrapping process. The type of shrink film to
be used is determined by the type of equipment used and by the needs
of the customer.
Shrink film and it’s
purpose
·
A clear, thin, low cost
plastic sheeting (film).
Usually found in roll stock. Used for protection, product
enhancement and for protecting packages from being opened prior to
purchase
·
Provide a see-through
overwrap for a clear sparkling display
·
Used to bundle multiple
products together
·
Reduces cost of product
packaging
The shrink process
typically involves two steps:
1.
Wrapping & Sealing
the
product
2.
Applying Heat
to
firmly tighten (shrink) the film around the
product.
Wrapping
& Sealing with shrink film
The most popular
wrapping and sealing machine is the “L” bar sealer. The name derives from the
fact that the sealing bar is in the shape of a backward “L” - . The L-Bar sealer which comes
in a variety of sizes, and with a variety of options, trims and
seals the film with each down stroke or cycle of the sealing bar.
By using a center
folded shrink film, side seals of the package are simultaneously
formed, producing a fully sealed individual bag around each product.
Now the product is ready to be sent to the heat tunnel for
shrinking.
Applying
Heat to the shrink film
The most common method
of applying heat is a hot air circulating chamber, otherwise known
as the heat tunnel.
Products travel through the tunnel, and are exposed to heat
for only a few seconds.
While traveling through the tunnel, shrinkage occurs. Since this only takes few
seconds, only the shrink film will be affected by the heat, not the
product. Occasionally
heat guns are used for applying heat and
shrinkage. | 
