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Term |
Definition |
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DIOP
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Diisooctyl phthalate
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Dip Coating
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Applying a plastic coating by dipping the article to be coated into a tank of melted resin or plastisol, then chilling the adhering melt.
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Discolouration
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Any change from the original color, often caused by overheating, light exposure, irradiation, or chemical attack.
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Dispersion
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Finely divided particles of a material in suspension in another substance.
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Dispersive Mixing
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The mixing of a fluid (melted polymer) with a solid (unmelted polymer, pigment and agglomerates above a certain size, etc.) which exhibits a yield port. Dispersive mixing is involved in the final melting of a polymer or breaking down a pigment in the manufacture of a colour concentrate.
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Dissipation Factor
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See 'Power Factor'
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Distributive Mixing
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The mixing of a fluid (melted polymer) and other components (such as liquid colour concentrate) where all components are fluids and do not exhibit a yield point. Distributive mixing is aimed at achieving thermal and colour uniformity where no solids breakdown is required.
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Divergent Die
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A die in which the internal channels leading to the orifice are converging (only applicable to dies for hollow bodies).
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DNP
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Dinonyl phthalate
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Dome
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In reinforced plastics, an end of a filament wound cylindrical container.
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DOP
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Dioctyl phthalate
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Double-shot moulding
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A means of turning out two-colour parts in thermoplastics materials by successive moulding operations.
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Draft
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The degree of taper of a side wall or the angle of clearance designed to facilitate removal of parts from a mould.
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Drape Assist Frame
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In sheet thermoforming, a frame (made up of anything from thin wires to thick bars) shaped to the peripheries of the depressed areas of the mould and suspended above the sheet to be formed. During forming, the assist frame drops down, drawing the sheet tightly into the mould and thereby preventing webbing between high areas of the mould and permitting closer spacing in multiple moulds.
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Drape Forming
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Method of forming thermoplastic sheet in which the sheet is clamped into a movable frame, heated, and draped over high points of a male mould. Vacuum is then pulled to complete the forming operation.
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Draw Down Ratio
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The ratio of the thickness of the die opening to the final thickness of the product.
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Drawing
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The process of stretching a thermoplastic sheet or rod to reduce its cross-sectional area.
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Drop Test
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Any test method in which the article being tested is dropped in a specified manner for a specified number of times or until the article fails from impact.
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Dry Coloring
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Method commonly used by fabricators for coloring plastics by tumble blending uncoloured particles of the plastic material with selected dyes and pigments.
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Dry Strength
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The strength of an adhesive joint determined immediately after drying under specified conditions or after a period of conditioning in the standard laboratory atmosphere. See Wet Strength.
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