Blown film extrusion device

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 47/88 (2006.01) B29C 47/20 (2006.01) B29C 55/28 (2006.01)

Patent

CA 2661392

The invention describes a blown film extrusion device comprising a blown film die (20) and an outer cooling ring (10), which can be placed on the upper side (21) of the said blown film die, has on its underside an annular resting surface (11) and can be centred with respect to the blown film die (10) by centring means. The centring means are formed by at least three radially arranged linear guides, which respectively comprise a radially extending recess (12.1,..., 12.4) and at least one guiding element (22.1,..., 22.4) engaging therein.

L'invention décrit un dispositif d'extrusion de film en manchon, qui présente une tête de soufflage (20) sur le côté supérieur (21) de laquelle peut être placé un anneau extérieur de refroidissement (10) qui présente sur son côté inférieur une surface annulaire de pose (11) et qui peut être centré par rapport à la tête de soufflage (20) par des moyens de centrage. Les moyens de centrage sont formés d'au moins trois guides linéaires disposés radialement et qui comprennent chacun une découpe (12.1, ..., 12.4) qui s'étend radialement et dans chacune desquelles s'engage au moins un élément de guidage (22.1, ..., 22.4).

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