Method for making a part with clearance volume by rotational...

B - Operations – Transporting – 29 – C

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B29C 41/22 (2006.01) B29C 41/00 (2006.01) B29C 41/04 (2006.01)

Patent

CA 2419433

The invention concerns a method for making a part with clearance volume by rotational moulding, or by a technique for depositing successive layers, and a part obtained by said method. The inventive method comprises a cycle of successive depositions of thermoplastic layers by rotational moulding, or by a technique for depositing successive layers, said cycle comprising at least a deposition by rotational moulding, or by the technique for depositing successive layers, at a temperature between 170 and 240 ·C of a layer consisting of ethylene-vinyl alcohol polymer having a density at said temperature ranging between 0.94 and 1.4 and a melt index ranging between 1.3 and 4.2 g/10 minutes.

La présente invention se rapporte à un procédé de fabrication d'une pièce de révolution par rotomoulage, ou par une technique permettant un dépôt de couches successives, et à une pièce obtenue par ledit procédé. Le procédé de la présente invention comprend un cycle de dépôts successifs de couches de matériaux thermoplastiques par rotomoulage, ou par une technique permettant un dépôt de couches successives, ledit cycle comprenant au moins un dépôt par rotomoulage, ou par la technique permettant un dépôt de couches successives, à une température de 170 à 240 ·C d'une couche constituée d'un copolymère éthylène-alcool vinylique ayant une densité à cette température comprise entre 0,94 et 1,4 et un indice de fluidité compris entre 1,3 et 4,2 g / 10 minutes.

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