Blown Film
A film extruded by the blown (air inflation) system. Sometimes erroneously called "extruded" film.
Co-extrusion
Two or more polymers extruded and combined in a die, each forming a distinct layer in the final film.
Electronic Beam Cross-linking
A process which binds the polymer chains into a network which significantly increases the strength of the film.
Tape
A relatively thick-walled (up to 40 mils) material extruded in a continuous length. Tape is formed into film on a racking machine.
Orientation or Racking
Mechanical stretching of a plastic film to produce a parallel arrangement of it's molecules. Films may be stretched uniaxially (in one direction, called preferential) or biaxially (in two directions). This process increases tensile strength and stiffness.
L-Sealer
A term which describes any of the automatic, semi-automatic, or manual trim-sealing equipment in which the seal bars are arranged in an "L" shape.
Sealing Wire
A seal wire can be defined as a circular wire, heated by virtue of its resistance to electrical current for the purpose of melting or fusing two layers of a shrink-packaging film together. Seal wires are generally made of nickel chrome alloy and range in diameter from .018 to .30 inches.
Tap Switch
A device used to control the amount of voltage supplied to the seal wire of an edge or trim seal machine. The device switches the output leads of a multi-output transformer.
Hole Punch
A pneumatically or electrically operated device composed of a punch and die which produces a deflate hole in a film.
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