Prediction of cooling time in injection molding by a simplified equation

Document Type

Conference Proceeding

Publication Date

6-1-2004

Abstract

A semi-analytical equation, used successfully in food freezing/chilling time prediction, is proposed as a potential simple alternative for cooling time prediction in injection molding of polymer parts, amorphous or semi-crystalline. This equation is based on a convective boundary condition for the mold-part interface and requires information on the thermal contact resistance (TCR) at this interface. By incorporating a literature based heat balance method in the proposed equation, it is possible to use it as a standalone predictor of polymer cooling time. Its performance was tested against data generated with C-MOLD™ for four polymers, Polystyrene (PS), Polycarbonate (PC), Polypropylene (PP), and Polyethylene (PE). The % mean error and its SD calculated this way were respectively -9.44 and 0.97 for PS, -9.44 and 0.83 for PC, -14.22 and 5 for PP and -20.12 and 1.38 for PE. The proposed equation can be used successfully to predict the cooling time of the selected semi-crystalline or amorphous polymers with the accuracy being higher for amorphous polymers and practically independent of the precise knowledge of the TCR, provided the latter is smaller than 0.001 m 2K/W.

Identifier

2442433434 (Scopus)

Publication Title

Annual Technical Conference ANTEC Conference Proceedings

First Page

655

Last Page

659

Volume

1

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