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A mold for plastics which is open when the material is introduced and which shapes the material by heat and by the pressure of closing.



Related Terms

HOT PRESSING

  1. Forming a metal-powder compact or a ceramic shape by applying pressure and heat simultaneously at temperatures high enough for sintering to occur. 2. Fabrication of a composite material through joining the reinforcement and the matrix by means of heat and pressure, usually in a hydraulically actuated press.

ABSORPTION CYCLE

In refrigeration, the process whereby a circulating refrigerant, for example, ammonia, is evaporated by heat from an aqueous solution at elevated pressure and subsequently reabsorbed at low pressure, displacing the need for a compressor.

DRAPER EFFECT

The increase in volume at constant pressure at the start of the reaction of hydrogen and chlorine to form hydrogen chloride; the volume increase is caused by an increase in temperature of the reactants, due to heat released in the reaction.

HEAT-EXCHANGER MATERIAL

The material of construction of a heat exchanger.

MICA

A silicate material used with high pressure gauge glasses on boilers.

LIFTING DEVICE

A device to manually open a pressure relief valve by decreasing the spring loading in order to determine if the valve is in working order.

DRAGLINE SCRAPER

A machine with a flat, plowlike blade or partially open bucket pulled on rope for withdrawing piled material, such as stone or coal, from a stockyard to the loading platform; the empty bucket is subsequently returned to the pile of material by means of a return rope.

MAXIMUM WORKING AREA

[INDENG] That portion of the working area that is readily accessible to the hands of a worker when in his normal states that the difference between the specific heat of a gas at constant pressure and its specific heat at constant volume is equal to the gas constant divided by the molecular weight of the gas.

THERMAL INSULATION

Material which is a poor conductor of heat; used to retard or slow down flow of heat through wall or partition.

HEAT CAPACITY

The quantity of heat required to raise a system one degree in temperature in a specified way, usually at constant pressure or constant volume. Also known as thermal capacity.

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