| Titre : |
The role of tool/sheet contact in plug-assisted thermoforming |
| Type de document : |
texte imprimé |
| Auteurs : |
P. Collins, Auteur ; E. M. A. Harkin-Jones, Auteur ; P. J. Martin, Auteur |
| Année de publication : |
2002 |
| Article en page(s) : |
p. 361-369 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Index. décimale : |
668.9 Polymères |
| Résumé : |
Plug-assisted thermoforming produces a wide range of polymer products through a combination of deformation by air pressure and contact with tool surfaces. In this paper the role of tool/sheet contact in determining the process output is investigated. A combination of thermoforming, friction and heat transfer tests were carried out on common tool and sheet materials. The results show that the typical friction coefficients for the material combinations are within the range 0.1 to 0.3, but the values rise sharply on approaching thermoforming temperatures. Thermal imaging tests demonstrate that all of the plug materials significantly cool the heated sheet on contact, even over very short periods of time. The temperature of the plug is very important. At low plug temperatures heat transfer effects predominate, whereas at high plug temperatures friction effects predominate. A plug temperature of approximately 100°C balances these effects and creates the most effective material distribution. |
| Note de contenu : |
- INTRODUCTION : Plug-assisted thermoforming - Process control - Thermoforming materials - Objectives
- THERMOFORMING TESTS : Wall thickness distribution - Tool materials - Measurement of friction - Materials and methods - Results - Measurement of heat transfert - Thermal properties of tool materials - Test method - Results - Plugging tests - Test results |
| DOI : |
10.3139/217.1702 |
| En ligne : |
https://drive.google.com/file/d/1wuvCG_6O04svfpmdPNOIbuQ3AE7_bG_n/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16040 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 4 (12/2002) . - p. 361-369
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