a b c d e f g h i j k l m n o p q r s t u v w x y z
a

ASTM

American Society for Testing and Materials

b

Blow Molding

The process of forming hollow articles by expanding a hot plastic element called a parison against the internal surfaces of a mold.

c

Compounding

Procedure that consists of mixing a polymer (thermoplastic resin) with one or more masterbatches by melting them together in order to obtain a plastic material.

Copolymer

A polymer of two chemically distinct monomers.

d
e

Extruder

A machine for producing more or less continuous lengths of plastics sections such as rods, sheets, tubes, and profiles.

Extrusion

Manufacturing process by which a compressed material is forced through a draw-plate with the section of the part to be manufactured.

f

Flame Retardant

Made or treated so as to resist burning.

g

Granulation

Operation that consists of transforming powder into an aggregate.

h

HDPE

High Density Polyethylene

Homopolymer

A polymer of one single chemically distinct monomer.

i

Injection Molding

The method of forming objects from granular or powdered plastics, most often of the thermoplastic type, in which the materials are fed from a hopper to a heated chamber in which it is softened, after which a ram or screw forces the material into a mold. Pressure is maintained until the mass has hardened sufficiently for removal from the mold.

Izod Impact Strength

A measure of impact strength determined by the difference in energy of a swinging pendulum before and after it breaks a notched specimen held vertically as a cantilever beam.

j
k
l

LDPE

Low Density Polyethylene

LLDPE

Linear Low Density Polyethylene

Linear Grade

Type of low density polyethylene defined by the range 1.5 - 2.5 melt flow, .919 - .924 density and is generally used for items such as garbage bags.

m

Masterbatch

A concentrated mixture of pigments and/or additives encapsulated during a heat process into a carrier resin which is then cooled and cut into a granular shape. Masterbatch allows the processor to colour raw polymer economically during the plastics manufacturing process.

Melt Flow Index

A measure of how many grams of a polymer flow through the die in ten minutes. The test is performed at a given temperature depending on the plastic. The force used to push the plastic through the system is supplied by a weight which sits on top of a ram.

n
o
p

Pellets

Tablets or granules of uniform size, consisting of resins or mixtures of resins with compounding additives which have been prepared for molding operations by extrusion and chopping into short segments.

Polyethylene

Variety of plastic substrates obtained by polymerization of ethylene.

Polymer

Molecule with high molecular weight composed of monomers linked to each other through covalent bonds.

PP

Polypropylene. A product that has excellent chemical resistance, is strong and has the lowest density of plastics used in packaging. It has a high melting point, making it ideal for hot-fill liquids. In film form it may or may not be oriented, or stretched. Polypropylene is found in everything from flexible and rigid packaging to fibers and large molded parts for automotive and consumer products.

Purging Agent

Accelerates the extruder cleaning process when ranges (colour, polymer type) are changed.

q
r

Regrind

Waste material from injection molding, blow molding and extrusion, which has been reclaimed by shredding or granulating. Regrind is usually mixed with virgin compound for remolding.

Resin

The term is use to designate any polymer that is a basic material for plastics.

s
t

Toll Compounding

Work carried out by a service provider on a raw material supplied by the dealer.

Truckload

The actual semi-trailer truck equivalent to approximately 42,000 lbs. This is one of the standard units of measure used by The Plastics Exchange.

u
v

Virgin Plastic

Any plastic compound or resin that has not been subjected to use or processing other than that required for its original manufacture.

w
x
y
z

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