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Term |
Definition |
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Ball Check Valve
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A device mounted at the discharge end of an injection screw used to allow forward flow of plastic during recovery and no flow during the injection stroke. This valving is accomplished by positioning of an internal ball.
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Banbury
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An apparatus for compounding materials composed of a pair of contra-rotating rotors which masticate the materials to form a homogeneous blend. This is an internal type mixer which produces excellent mixing.
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Barrel (Cylinder)
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A cylindrical housing in which the screw rotates, including the integrally formed special inner surface material, or replaceable liner, if used. Also commonly referred to as a cylinder.
Telford Smith Engineering manufacture screws, barrels and extruders as well as recondition your existing screws, barrels and tiebars on extrusion, injection & blow moulding machines. Visit www.telfordsmith.com.au for more information.
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Barrel Capacity
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The amount of material that a machine will hold with the screw fully retracted. The machine is prepared to deliver that amount of material when it is at its largest shot size setting. Barrel capacity can be described as either the weight or the volume of material that is in front of the screw when it is at its maximum shot size setting.
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Barrel Shell (Backing Material)
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The outer thick wall of the barrel made from metal backing material to provide strength and to hold the lining.
Telford Smith Engineering manufacture screws, barrels and extruders as well as recondition your existing screws, barrels and tiebars on extrusion, injection & blow moulding machines. Visit www.telfordsmith.com.au for more information.
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Barrier Flight
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A secondary flight of reduced outside diameter and usually designed to separate melted polymer from solid polymer or to enhance melting by having the polymer pass over it.
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Barrier Resins
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A group of resins specially formulated to resist the transmission of oxygen, water, solvents, essential oils, etc.
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Bayonet Adapter
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A cylindrical shaped part with holding pins that threads into the thermocouple hole and retains a spring loaded thermocouple.
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Bearing (HUB)
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The portion of the screw immediately behind the flighted length which prevents the escape of material and provides a seal between the screw and the barrel.
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Bell End
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A flange at the discharge end of the barrel which provides added strength to withstand internal pressure.
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Benzene Ring
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The basic structure of benzene, the most important aromatic chemical. It is an unsaturated, resonant 6-carbon ring having three double bonds. One or more of the 6 hydrogen atoms of benzene may be replaced by other atoms or groups.
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Beta Gage (or beta-ray guage)
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A gage consists of two facing elements, a B-ray-emitting source and a B-ray detector. When a sheet material is passed between the elements, some of the B-rays are absorbed, the percent absorbed being a measure of the a real density or the thickness of the sheet.
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Bimetallic
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A term used to indicate that a barrel is composed of two (or more) metals, commonly used to refer to barrels which have a centrifugally cast lining.
Telford Smith Engineering manufacture screws, barrels and extruders as well as recondition your existing screws, barrels and tiebars on extrusion, injection & blow moulding machines. Visit www.telfordsmith.com.au for more information.
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Binder
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In a reinforced plastic, the continuos phase which holds together the reinforcement.
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Biocides and Fungicides
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These additives act as pesticides and are used to inhibit the growth of fungus and other pests.
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Blanking
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The cutting of flat sheet stock to shape by striking it sharply with a punch while it is supported on a mating die. Punch presses are used. Also called Die Cutting.
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Bleed
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To give up colour when in contact with water or solvent; undesired movement of certain materials in a plastic (eg plasticisers in vinyl) to the surface of the finished article or into an adjacent material. Also called Migration.
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Blister
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A raised area on the surface of a moulding caused by the pressure of gases inside it on its incompletely hardened surface.
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Blister Ring
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A raised portion of the root between flights of sufficient height and thickness to effect a shearing action of the polymer as it flows between the blister ring and the inside wall of the barrel.
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Block Copolymer
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An essentially linear copolymer in which there are repeated sequences of polymeric segments of different chemical structure.
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