Process for the manufacture of a strip material

D - Textiles – Paper – 06 – N

Patent

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D06N 3/00 (2006.01) D21F 1/00 (2006.01) D21F 7/08 (2006.01)

Patent

CA 2214003

19 In a process for the manufacture of a strip material (1) a plastics layer (5, 6) is formed at least on one side of a support (2) from a mixture of plastics materials and particulate soluble corpuscles wherein the soluble corpuscles are leachable by a solvent of a type against which the plastics material is stable. Thereafter the soluble corpuscles are leached out from the plastics layer (5, 6) with the formation of throughflow passages. According to the invention, a plastics powder is prepared as the plastics material, which is mixed with the soluble corpuscles and applied onto the support (2). By heat and pressure treatment a plastics layer (5, 6) including therein the soluble particles, is produced from the mixture of plastics powder and soluble corpuscles, prior to the soluble corpuscles being leached at least in part out of the plastics layer (5,6).

Dans le cadre d'un processus de fabrication d'un matériau en bandes (1), une couche en matières plastiques (5 et 6) est produite sur au moins un côté d'un support (2) à partir d'un mélange de matières plastiques et de corpuscules solubles qui sont lixiviables au moyen d'un solvant d'un certain type, lequel permet aux matières plastiques de rester stables. Par la suite, les corpuscules solubles sont lixiviées et enlevées de la couche en matières plastiques grâce à la formation de passages. En conformité avec l'invention, une poudre de matières plastiques est préparée afin qu'elle serve de matériau, est mélangée à des corpuscules solubles et est appliquée sur le support (2). Au moyen d'un traitement thermique sous pression, une couche en matières plastiques (5 et 6), qui comprend des particules solubles, est produite à partir d'un mélange de poudre de matières plastiques et de corpuscules solubles, avant que les corpuscules solubles soient lixiviées et enlevées au moins en partie de la couche de matières plastiques.

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