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Some factors influencing cooling rates of rotationally molded parts
Author(s) -
Throne James L.
Publication year - 1972
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760120504
Subject(s) - mold , materials science , thermal diffusivity , shrinkage , quenching (fluorescence) , composite material , heat transfer coefficient , thermal , heat transfer , molding (decorative) , mechanics , thermodynamics , physics , quantum mechanics , fluorescence
Recently, rotational molding engineers, concerned with warpage and uneven cooling in parts, have been “pre‐cooling” the mold in forced draft air after removal from the oven and prior to water quenching to removal temperature. In this paper, we analyze some of the factors that influence the rate of heat removal from an amorphous plastic in a metal mold. We find that mold thickness and thermal diffusivity, convection heat transfer coefficient of the cooling fluid, the thermal properties of the plastic and the initial, final and “freezing” temperatures of the plastic influence this cooling rate and the corresponding rate of volumetric shrinkage. We illustrate our analysis with several examples and discuss some guidelines in detail.