Method and apparatus for microcellular polymer extrusion

B - Operations – Transporting – 29 – C

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B29C 44/50 (2006.01) B29C 44/32 (2006.01) B29C 44/34 (2006.01) B29C 44/46 (2006.01) B29C 47/10 (2006.01) B29C 47/20 (2006.01)

Patent

CA 2264159

Continuous polymeric extrusion nucleation systems and methods useful for making polymeric microcellular foamed materials, including crystalline and semi-crystalline polymeric microcellular materials, are provided. Pressure drop rate is an important feature in some embodiments, and the invention provides systems for controlling these and other parameters. One aspect involves a multiple-pathway nucleator that is separated from a shaping die by a residence chamber. Another aspect involves a die for making advantageously thick articles, including a multiple-pathway nucleation section. Microcellular material can be continuously extruded onto wire, resulting in a very thin, essentially closed-cell microcellular insulating coating secured to a wire. Other very thin microcellular products can be fabricated as well.

L'invention concerne des systèmes et procédés de germination et d'extrusion de polymère en continu, servant à produire des matériaux polymères expansés microcellulaires, y compris des matériaux polymères expansés cristallins et semi-cristallins. Dans certains aspects de l'invention, le taux de chute de pression constitue une caractéristique importante. L'invention concerne également des systèmes permettant de réguler cette caractéristique ainsi que d'autres paramètres. Dans l'un des aspects de l'invention, on utilise un élément de germination à voies multiples, séparé de la filière par une zone de séjour. Dans un autre aspect, on utilise une filière pour produire de façon avantageuse des articles épais, comprenant une section de germination à voies multiples. Le matériau microcellulaire peut être extrudé sur un fil métallique, ce qui permet d'obtenir un très fin revêtement isolant microcellulaire, essentiellement à cellules fermées, fixé sur le fil métallique. Il est également possible de réaliser d'autres produits microcellulaires très fins.

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