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Materials Processes

Processes

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Die Cutting

The process of cutting shapes from sheets of plastic by pressing a shaped knife edge into one or several layers of sheeting.  The dies are often called steel rule dies, and pressure is applied by hydraulic or mechanical presses.  Die cut pieces are often the fabricated and assembled.

Source: Whittington, Lloyd R.  Whittington's Dictionary of Plastics (Stamford, CT: Technomic, 1968).

 

Dip Coating

A coating process wherein the object to be coated, preheated or cold depending on the nature of the coating material, is dipped into a tank of fluid resin, solution or dispersion, withdrawn and subjected to further heat or drying to solidify the deposit.

Source: Whittington, Lloyd R.  Whittington's Dictionary of Plastics (Stamford, CT: Technomic, 1968).

 

Double-Shot Molding

A process for production of two-color parts by means of successive molding operations.

Source: Whittington, Lloyd R.  Whittington's Dictionary of Plastics (Stamford, CT: Technomic, 1968).

 

Drape Forming (drape thermoforming)

The method of forming a thermoplastic sheet into three-dimensional articles in which the sheet is clamped in a movable frame, heated, and lowered to drape over the high points of a male mold. Vacuum is then applied to complete the forming operation. 

Source: Whittington, Lloyd R.  Whittington's Dictionary of Plastics (Stamford, CT: Technomic, 1968).

 

Dry Coloring

The process of adding colorant to molding compounds and resin in particulate form by tumble blending them with dyes, pigments or color concentrates.  This process enables custom molders or extruders to carry a large inventory of uncolored compound, preparing smaller batches or colored compounds to customers’ specifications. [

Source: Whittington, Lloyd R.  Whittington's Dictionary of Plastics (Stamford, CT: Technomic, 1968).

 

Dry Layup

The process of construction of a laminate by the layering of pre-impregnated, partly cured reinforcements in or on a mold, usually followed by bag molding or autoclave molding.

Source: Whittington, Lloyd R.  Whittington's Dictionary of Plastics (Stamford, CT: Technomic, 1968).

 

Dry Winding

Filament winding using pre-impregnated roving, as differentiated from wet winding in which unimpregnated roving is pulled through a resin just prior to winding on a mandrel.

Source: Whittington, Lloyd R.  Whittington's Dictionary of Plastics (Stamford, CT: Technomic, 1968).