Journal
JOURNAL OF PLASTIC FILM & SHEETING
Volume 31, Issue 1, Pages 96-112Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/8756087914538443
Keywords
Thermoforming; formability; high impact polystyrene sheet; stretching; depth of draw; draft angle
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High impact polystyrene sheets (HIPS) of 1.5mm and 2.5mm thicknesses were thermoformed on moulds of different parameters at sheet heating temperatures of 130? and 140?. Formability studies indicated no difference in wall thickness distribution at different sheet temperatures. Due to non-uniform stretching of the sheet, wall thickness distribution along the slant length was found to have three regions. In the regions near the mould corner and clamp point, wall thickness was found to decrease with increase in distance from the corner, in these zones. The decrease near the corner was much greater and sharper than that near the clamp point. The decrease in both regions was found to increase at higher depths of draw and decrease at higher draft angles. In the intermediate portion of the slant length, no significant variation in wall thickness was observed.
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