Method for producing multi-layered preforms

Details Method for producing multi-layered preforms Method for producing multi-layered preforms

B - Operations, Transporting

29

C

B29C 45/16 (2006.01)

Patent

CA 2303766

The inventive method for producing multilayered preforms makes it possible to create extremely thin layers, especially a thin surface layer and/or a thin barrier layer. These thin layers are at the most 35 % and 5 % respectively of the overall volume. They are produced using a multi-component injection moulding form tool which is operated in such a way that the plastic component provided for creating the thin layers is conveyed through the innermost jet chamber. Said plastic component has a slightly higher temperature and is therefore slightly viscous. Preforms produced in this way are characterised by a surface layer representing less than 35 vol. % or a barrier layer representing approx. 5 vol. %.

L'invention concerne un procédé de production de paraisons multicouche permettant la production de couches extrêmement fines, notamment d'une fine couche formant peau et/ou d'une fine couche barrière. Ces fines couches représentent respectivement au maximum 35 % et moins de 5 % du volume total. Pour la production de ces fines couches, on utilise un moule d'injection à plusieurs constituants fonctionnant de telle façon que le constituant plastique destiné à la formation d'une fine couche soit acheminé via la chambre de buse interne. Ce constituant plastique a une température légèrement plus élevée et donc une viscosité plus faible. Les ébauches ainsi produites sont caractérisées par une couche formant peau représentant moins de 35 % en volume et par une couche barrière représentant environ 5 % en volume.

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