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Term |
Definition |
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Breaker Plate (Extrusion)
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A metal plate installed across the flow of the melt between the end of an extruder screw and the die adapter with openings through it such as holes or slots. It commonly supports a screen and also reduces any swirling in the melt flow before it reaches the die.
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Breaker Plate Recess (Extrusion)
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The internal counterbore at the discharge end of an extruder barrel that accepts the breaker plate and provides the seal and alignment of the die adapter.
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Breathing
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The opening and closing of a mould to allow gases to escape early in the moulding cycle. Also called Degassing. When referring to plastic sheeting, breathing indicates permeability to air.
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Brighteners
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Are used to add smoother or brighter coatings.
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Brittle Temperature
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A measure for judging the relative merits of materials for low temperature flexing or impact - i.e., the temperature at which materials rupture by impact under specified conditions.
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B-Stage
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An intermediate stage in the reaction of a thermosetting resin in which the material softens when heated and swells in contact with certain liquids but does not entirely fuse or dissolve. Resins in thermosetting moulding compounds are usually in this stage. See also A-Stage and C-Stage.
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Bubbler Mould Cooling (Injection Moulding)
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A method of cooling an injection mould in which a stream of cooling liquid flows continuously into a cooling cavity equipped with a coolant outlet normally positioned at the end opposite the inlet. Uniform cooling can be achieved in this manner.
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Bulk Density
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The mass per unit volume of a moulding powder as determined in a reasonably large volume. The recommended test method is ASTM D1182-54.
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Bulk Factor
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Ratio of the volume of loose moulding powder to the volume of the same weight of resin after moulding.
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Bulk-molding compounds (BMC)
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Bulk-molding compounds are used as a premix in composite manufacturing. A BMC consists of a mixture of resin, reinforcements, inert fillers, and other additives which form a puttylike preformed shape, rope or sheet.
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Burning Behaviour
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The characteristics exhibited by the substance when it ignites and burns.
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Burning Rate
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A term describing the tendency of plastics articles to burn at given temperatures. Certain plastics, such as those based on shellac, burn readily at comparatively low temperatures. Others will melt or disintegrate without actually burning, or will burn only if exposed to direct flame. These latter are often referred to as self-extinguishing.
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Bushing (Extrusion)
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The outer ring of any type of a circular tubing or pipe die which forms the outer surface of the tube or pipe.
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Butadiene
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CH2:CH CH:CH2. A gas, insoluble in water but soluble in alcohol and ether, obtained from the cracking of petroleum, from coal tar benzene or from acetylene produced from coke and lime. It is widely used in the formation of copolymers with styrene, acrylonitrile, vinyl chloride and other monomeric substances, where it imparts flexibility to the subsequent mouldings.
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Butadiene Styrene Plastics
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A synthetic resin derived from the copolymerisation of butadiene gas and styrene liquids.
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Butt-Fusion
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A method of joining pipe, sheet, or other similar forms of a thermoplastic resin wherein the ends of the two pieces to be joined are heated to the molten state and then rapidly pressed together to form a homogeneous bond.
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Buttress Thread
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A type of threading in which the thread sides terminate abruptly in threading gradually tapering down to the neck finish. Designed to withstand maximum force in one direction only. Cross section of thread is triangular.
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Butylene Plastics
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Plastics based on resins made by the polymerisation by butene with one or more unsaturated compounds, the butene being in greatest amount by weight.
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C Clamp Flange
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A circular tapered flange at the discharge end of an extruder barrel used to hold the die adapter. A similar shaped flange on the die adapter and a "C" shaped clam accomplishes the closure.
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CA
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Cellulose-acetate
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