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A type of extrusion whose only source of heat is the conversion of the
drive energy through the viscous resistance of the plastics mass in the
extruder.
The resistivity of molten plastic material to forward flow.
The
part of the extruder encasing the screw or plunger.
The sleeve forming the inner surface of the barrel.
The process of pressing or smoothing material between rollers.
Sometimes referred to as sidings, it is extruded PVC-U boards that are
used as outdoor weather-resistant façade panels.
Any
plastic material prepared for subsequent manufacturing processes,
specifically extrusion, molding or calendering.
The transition section of a screw channel in which a reduction in the
screw channel volume occurs.
A
tank typically containing water through which extrusion is constantly
passed for cooling.
The
technique of cross-linking a plastics material.
The section of a two-stage extruder in which an increase in screw
channel volume occurs.
The
component on a plastics extruder affixed to the extruder head through
which the melt is pushed to form the desired profile.
In
moulds, the main support for the punch or mould cavity.
A
free flowing blend of compound or resin and other ingredients as
prepared for an additional manufacturing operation specifically for
extrusion or molding.
The
product or result of an extrusion process. An extrudate is a product or
material forced through a shaping orifice as a continuous body.
The minimal inner diameter of the extruder barrel
A coating technique in which molten plastic feeds directly from an
extruder die into a nip-roll assembly combined with the substrate.
Also
called a caterpillar, it is an apparatus used for the continual
removal of extrudate from the die.
The
unique process of aging a thermoplastic or thermoset product and
examining the percentage of retained physical and chemical properties
after exposure to heat for a prolonged period of time.
Any
extrusion material heated to a plastic condition.
A term that refers to the strength of molten plastic.
The element of tubing tie that shapes the outer surface of a tube.
Resins
or mixtures of resins with compounding additives in the shape of
similar-sized tablets and granules that have been extruded or chopped
into short segments to prepare them for molding operations.
A
barrel with a temperature control, wherein a plunger pushes material in
a melted state to the die.
Any of
several physically similar polymerized synthetics or chemically altered
natural resins, such as thermoplastic materials (polyvinyl, polystyrene,
polyethylene) or thermosetting materials (polyesters, epoxies, silicones
used with fillers, stabilizers, pigments).
A
helically grooved rotating element inside the barrel of a screw
extruder. The main purpose of a screw is to melt and feed raw material
from the feeder to the die, but it also homogenizes, compresses and
pressurizes the material.
A machine comprised of a barrel with a temperature control. It houses
one or more rotating screws, which pass plastic materials from the feed
aperture and move them in the form of melt under pressure through a die.
An
apparatus for reeling extruded material.
A
term that refers to the family of materials that can be melted only once
during the original processing and cannot be reprocessed after the
original part is made.
Any material, such as polyethylene, Santoprene and ABS, which can be
remelted and reprocessed without considerable loss of properties or
scrap loss.
An
apparatus at the discharge stage of the screw for finishing homogenizing
and blending of the melt.
An
extruded PVC-U channel used to contain and protect pipes or cables.
A procedure utilizing a sizing die with a vacuum applied to the outer
surface of the extrudate.
A
generic term for PVC, it is one of various compounds of ethylene that
are polymerized to form resins and plastics (e.g. polyvinyl or
polyethylene plastics). |