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International Journal of Forming Processes
1292-7775
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 ARTICLE VOL 8/SI - 2005  - pp.265-281
TITLE
Thermal and Friction Effects during Plug Assisted Thermoforming. Experimental Approach

ABSTRACT
Main objective of this paper is to illustrate the influence of physical phenomena involved in plug-sheet contact on thickness distribution in plug assisted thermoforming of polystyrene blends. Relative importance of friction and thermal exchanges is discussed on the basis of an experimental approach including thermoforming and friction tests performed using several types of plug-material. It is concluded that the interface temperature (Ti) is of prime importance. This latter is controlled by plug and sheet temperatures and physical properties of the material used for the plug (thermal effusivity). At low Ti, i.e. below glass transition (low effusivity and/or cold plug), heat transfer are efficient enough for strongly cooling down the sheet making friction effects negligible whereas at high Ti (low effusivity plug and/or hot high effusivity plug) friction effects can be observed. In parallel, friction coefficient between the plug and the sheet appears to depend on local temperature and relative velocity. Combined effects of cooling by the plug and friction control final thickness distribution making intuitive optimisation of the process difficult.


AUTEUR(S)
Aliza ERNER, Noëlle BILLON

KEYWORDS
Polymers, Plug assisted Thermoforming, Polystyrene, Friction, Thermal Exchanges, Interface Temperature.

LANGUE DE L'ARTICLE
Anglais

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