Manifold-type die for the production of a multilayer blown film

Details Manifold-type die for the production of a multilayer blown film Manifold-type die for the production of a multilayer blown film

B - Operations, Transporting

29

C

B29C 47/06 (2006.01) B29C 47/86 (2006.01) B29C 47/92 (2006.01)

Patent

CA 2679013

The invention relates to a blown-film die (1, 21, 208) for the production of a multilayer blown film (18) with at least two plastics layers, where this die (1, 21, 208) has at least the following melt-conducting regions (16, 17, 25, 205) and through which the melt passes in succession in the direction (z) of flow of the melt: feed lines (25, 205) leading to the at least two separate slits for the supply of a separate stream to at least two separate slits (16) for the supply of a separate stream to an annular slit (17) for combination to form the film composite (18). There is at least one thermal converter (85, 142) arranged at at least one flow path of at least one separate stream upstream of the annular slit (17).

L'invention concerne une tête de soufflage (1, 21, 208) pour la fabrication d'une feuille soufflée multicouche (18) ayant au moins deux couches de matière plastique. Cette tête de soufflage (1, 21, 208) présente au moins les zones suivantes (16, 17, 25, 205) conduisant la masse fondue, qui sont successivement traversées par la matière fondue dans la direction d'écoulement (z) de celle-ci : des conduits d'alimentation (25, 205) menant aux fentes individuelles, au moins au nombre de deux, destinées à conduire un flux individuel ; au moins deux fentes individuelles (16) pour conduire un flux individuel ; une fente annulaire (17) pour réunir la feuille composite (18). Au moins un thermoélément (85, 142) est disposé sur au moins un parcours d'écoulement d'au moins un flux individuel avant l'atteinte de la fente annulaire (17).

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