B - Operations – Transporting – 29 – B
Patent
B - Operations, Transporting
29
B
B29B 11/10 (2006.01) B29C 47/04 (2006.01) B29C 47/06 (2006.01)
Patent
CA 2185110
Tubular preform comprising several layers of coaxial thermoplastic materials. Said preform includes at least one three-layered inner structure comprising an inner (1), median (2) and outer (3) layer and is characterized in that the median layer (2) consists of first and second alternating transverse rings (2<u>a</u>, 2<u>b</u>) made of first and second thermoplastic materials (A, B), and separate longitudinal rods (2<u>c</u>) formed from a third plastic material (C), distributed about the preform axis. Said rods intersect the alternating transverse rings (2<u>a</u>, 2<u>b</u>) of the median layer (2) as they delimit cells with the first transverse rings (2<u>a</u>), said cells (2<u>b</u>) being made of a second thermoplastic material (B) and having a longitudinal size exceeding that of the first transverse rings (2<u>a</u>). The invention also concerns a method and apparatus for the manufacture of said preform by coextrusion.
L'invention concerne une paraison tubulaire à plusieurs couches de matières thermoplastiques coaxiales, comprenant au moins une structure à trois couches intérieure (1), médiane (2) et extériure (3), caractérisée en ce que la couche médiane (2) est constituée d'une alternance de premiers et seconds anneaux transversaux (2a, 2b), constitués respectivement des première et seconde matières thermoplastiques (A, B), et de joncs longitudinaux individuels (2c) en une troisième matière plastique (C), répartis autour de l'axe de la paraison, coupant les anneaux transversaux alternés (2a, 2b) de la couche médiane (2) en délimitant, avec les premiers anneaux trasversaux (2a), des cellules (2b) constituées de la seconde matière thermoplastique (B) et d'une dimension longitudinale supérieure à la dimension longitudinale des premiers anneaux transversaux (2a). L'invention concerne également un procédé et un appareil pour la fabrication de ladite paraison, par coextrusion.
Goudreau Gage Dubuc
Lefort Olivier Simon
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