A film is a synthetic resin adhesive, with or without a film
carrier fabric, usually of the thermosetting type, in the form of a thin
film of resin, used under heat and pressure as an interleaf in the
production of bonded structures.
Printed film used for packing, is a film with a display of printing,
lithographing, embossing, stickers, seals, or other written, printed or
graphic matter. These are leak proof films.
Specification of Printed Packaging Films
Packaging products require a specific range of coefficient of friction
(COF) to allow automatic packaging operations to run unhindered and to
prevent the package from sliding during storage.
When an ink or coating is applied to a film, the COF of the printed
film usually is higher than the film itself. The printed film COF will
drop over time as the slip agents distribute themselves within the film
and ink layer. If the printed film has retained solvent, this will cause
a higher COF. As the ink dries, the COF will drop. The presence of
retained solvent also can increase the migration of slip agents.
The consumption of printing films is growing for stretch and heat
shrink sleeve labels, which make attractive and low-cost-temper evident
seals.
Applications of Printed Packaging Films
- Typical applications of these printed films include:
- Preformed bags for bread, rolls, specialty breads, tortillas
- Printed roll stock for fruits, vegetables and potatoes
- Preformed bags for vegetables and meat and poultry products
- Preformed round bottom bags for fresh poultry
- Preformed bags for apples, oranges, potatoes and carrots
- Printed roll stock for retail size package of sugar
- Printed polyethylene laminate roll stock for rice
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