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Term |
Definition |
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Blocking
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An undesired adhesion between touching layers of a materiel, such as occurs when moderate pressure during storage or use.
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Bloom
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A visible exudation or efflorescence on the surface of the material.
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Blow Molding
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See 'Blow Moulding'
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Blow Moulding
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A method of fabrication in which a parison (hollow tube) is forced into the shape of the mould cavity by internal air pressure.
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Blow Pressure
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The air pressure used to form a hollow part by blow moulding.
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Blow Rate
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The speed at which the air enters the parison during the blow moulding cycle.
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Blowing Agents
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See 'Foaming Agents'
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Blown Tubing
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A thermoplastic film which is produced by extruding a tube, applying a slight internal pressure to the tube to expand it while still molten and subsequent cooling to set the tube. The tube is then flattened through guides and would up flat on rolls. the size of blown tubing is determined by the flat width in inches as wound rather than by the diameter as in the case of rigid types of tubing.
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Blowup Ratio
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In blow moulding, the ratio of the mould cavity diameter to the parison diameter. In blown tubing (film), the ratio of the final tube diameter (before gusseting, if any) to the original die diameter.
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Blueing
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A mould blemish in the form of a blue oxide film which occurs on the polished surface of a mould as a result of the sue of abnormally high mould temperatures.
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Blunt Thread Start
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A thread design where the start of the thread has been squared off for exact locating of the container in a printing or labeling machine. See Lug.
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BMC
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Bulk moulding compound
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Bore
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The inside diameter of the barrel which houses the screw.
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Boss
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Protuberance on a plastic part designed to add strength, to facilitate alignment during assembly, to provide for fastenings, etc.
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Boston Round
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A particular shape of container; cross section as well as shoulders are round.
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Bottom Blow
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A specific type of blow moulding machine which forms hollow articles by injecting the blowing air into the parison from the bottom of the mould.
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Bottom Plate
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Part of the mould which contains the heel radius and the push-up.
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Branched
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In molecular structure of polymers (as opposed to Linear), refers to side chains attached to the main chain. Side chains may be long or short.
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Breakdown Voltage
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The voltage required, under specific conditions, to cause the failure of an insulating material. See Dielectric Strength.
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Breaker Plate
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A perforated plate located at the rear end of an extruder head. It often supports the screens that prevent foreign particles from entering the die.
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