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Term |
Definition |
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Gate
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In injection and transfer moulding, the orifice through which the melt enters the cavity. Sometimes the gate has the same cross-section as the runner leading to it; often, it is severely restricted.
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Gating Strategy
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The approach you use to choose the number and location of gates in a mould.
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Gel
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In polyethylene, a small amorphous resin particle which differs from its surroundings by being of higher molecular weight and/or crosslinked, so that its processing characteristics differ from the surrounding resin to such a degree that it is not easily dispersed in the surrounding resin. A gel is readily discernible in thin films.
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Gel Coat
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(1) Resin layer (usually coloured) that protects the underlying resin/glass fibre laminate from external influences such as impact, UV light, chemicals, etc.; the side of the moulded part that remains most visible or external after demoulding, hence the gel coat is the first layer applied to the mould (2) A thin, outer layer of resin, sometimes containing pigment, applied to a reinforced plastics molding as a cosmetic.
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Gel Point
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The stage at which a liquid material to form a gel under specified conditions of temperature as measured by a specific test.
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Gel Time
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The time required for a liquid material to form a gel under specified conditions of temperature as measured by a specific test.
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Glass Thread
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A type of threading in which the thread side gradually taper down to the neck finish. Cross section of threads are semi-circular.
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Glass Transition Temperature (Tg)
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(1) The approximate midpoint of the temperature range over which the glass transition takes place.(2) Amorphous regions of a thermoplastic soften at this temperature
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Glitter (or Flitter or Spangles)
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A group of special decorative materials consisting of flakes large enough so that each separate flake produces a plainly visible sparkle or reflection. They are incorporated directly into the plastic during compounding.
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Gloss
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The shine or lustre of the surface of a material.
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GP
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General purpose
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Graduated
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Moulded in scale to indicate content level in container.
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Graft Copolymers
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A chain of one type of polymer to which side chains of a different type are attached or grafted (eg. Polymerizing butadiene and styrene monomer at the same time).
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Granular Structure
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Non-uniform appearance of finished plastic material due to retention of, or incomplete fusion of, particles of composition, either within the mass or on the surface.
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Granulate
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Plastic starting material for primary processing; particles are usually in the form of lentil-shaped cylinders
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Gravure Printing
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Depositing ink on plastic film or sheeting or product from depressions of a specific depth, pattern and spacing, which have been either mechanically or chemically engraved into a printing cylinder.
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Grit Blasted
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A surface treatment of a mould in which steel grit or sand materials are blown to the walls of the cavity to produce a roughened surface. Air escape from mould is improved and special appearance of moulded article is often obtained by this method.
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Grooved Liner (Or Barrel)
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A liner whose bore is provided with longitudinal grooves, usually for several diameters in the feed section only.
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Guide Pins
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Devices that maintain proper alignment of force plug and cavity as mould closes.
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Gusset
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A tuck placed in each side of tube of blown tubing as produced to provide a convenient square or rectangular package, similar to that of the familiar brown paperbag or sack, in subsequent packaging.
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What does that mean?!