| Titre : |
Minimizing residence time : Screw-piston plastication units are the preferred choice for small shot weights |
| Type de document : |
texte imprimé |
| Auteurs : |
Michael Kleinebrahm, Auteur |
| Année de publication : |
2017 |
| Article en page(s) : |
p. 42-43 |
| Langues : |
Anglais (eng) |
| Catégories : |
Matières plastiques -- Moulage par injection -- Appareils et matériel
Plastification
Vis piston
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
In the manufacture of small and microparts, the injected volume is usually very small – presupposing suitable mold design without overdimensioned sprue geometry – and cycle times are short because the wall thicknesses are generally low. The plastication units required should therefore be capable of supplying a small, precisely metered volume of optimally processed melt at short time intervals. A new screw-piston plastication system with 8 mm screw diameter is setting records here. |
| Note de contenu : |
- Overcoming obstructions to heat transfert
- The right screw geometry assists the process
- Permanent material throughput for better parts
- Smaller screw means short residence times
- FIGURES : Geometry of a 12-mm screw - optimized for miniature injection molding - In the screw-piston plastification unit, the pellet stock is uniformly and rapidly melted by the shearing movement during rotation and continuous material exchange at the hot cylinder wall - 2. For screw plastification (8mm diameter in this case), the material is always plasticated under the same conditions and wth the same residence time. The Fifo principle (first-in, first-out) is thus met - 3. The plastification unit, with 8-mm screw, is also available as a series feature in the machine models boy XXS and XS (63 and 100 KN clamping force) for silicone processing |
| En ligne : |
https://drive.google.com/file/d/1u4UVvznygVSi3GezRfTo1hAU55aFHWZe/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29003 |
in KUNSTSTOFFE INTERNATIONAL > Vol. 107, N° 6-7 (06-07/2017) . - p. 42-43
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