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Estimation of injection pressure during mold filling
Author(s) -
Titomanlio G.
Publication year - 1982
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.760220509
Subject(s) - materials science , dimensionless quantity , polystyrene , mechanics , crystallization , thermal diffusivity , amorphous solid , thermodynamics , flow (mathematics) , latent heat , mold , thermal , composite material , polymer , physics , chemistry , organic chemistry
Dimensionless diagrams for estimating the bulk temperature of the flow front and injection pressure in the limit of small viscous generation are obtained. Also, a criterion for neglecting viscous generation is identified. The diagrams, based on the Lord and Williams model, refer to rectangular geometry and amorphous materials. A satisfactory comparison is obtained with literature data taken on polystyrene. A reasonable estimate of polyethylene injection pressure was obtained by roughly accounting for latent heat of crystallization through modified thermal diffusivity.