Sheet bowing in thermoforming | Zendy

Vodak P.B. | Zendy; Mix A.W. | Zendy; Giacomin A.J. | Zendy

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Sheet bowing in thermoforming

Author(s) -

Vodak P.B.,

Mix A.W.,

Giacomin A.J.

Publication year - 2011

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.22029

Subject(s) - thermoforming , bowing , dimensionless quantity , materials science , slab , thermal expansion , temperature gradient , mechanics , composite material , structural engineering , physics , engineering , philosophy , theology , quantum mechanics

Sheets to be thermoformed are often heated unevenly, with a higher temperature above the sheet. This results in upward bowing of the sheet, and this is caused by thermal expansion. We combine the analytical solution for the temperature gradient in a slab heated by radiation with a relationship developed from the cylindrical geometry of the sheet as it bows. We thus derive a dimensionless equation for sheet bowing as an implicit function of time for both top and dual heating. We thus uncover a new dimensionless group which we call sheet bowability . We find good agreement between our theory and our new top‐heated sheet bowing measurements. We provide a worked example so that the engineer can see how to apply our results. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers

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