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Definitions (41)
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transverse direction
Film direction which is at a right angle to the direction of extrusion, also called cross direction (CD). Tubing
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additive
A compound or substance added to polymer to alter or improve its characteristics. Common additives include slip, antiblock, and color pigments. Antiblock
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antioxidant
Additive which prevents degradation and oxidation of material when exposed to ambient air during processing and storage of finished product. Antistat
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backside treat
Film defect when areas of the untreated/lamination side of film test positive for corona treatment. Barefoot
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barrier resins
Polymers such as polyamide and EVOH which have very low permeability to gases. Blend
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blocking
An undesirable adhesion between layers of film or sheeting which may develop during processing or storage. Bloom
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blown film
Extrusion of a continuous thin walled tube of plastic through a round die and inflating it to form a bubble. The bubble is then collapsed flat between rollers and slit into layflat film which is wound [..]
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calcium carbonate
Mineral based additive used as filler, modifier, and sometimes antiblock agent. Center Fold
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coefficient of friction
A unitless measurement used to quantify how slippery or tacky a film is. It is the ratio of the force required to slide an object over a frictionless surface to the force required to slide the same ob [..]
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color concentrate
A plastics compound which contains a high percentage of color pigment blended with a carrier resin. Copolymer
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