Method for making a part with clearance volume by rotational moulding and resulting part
AssigneeCommissariat a l'Energie Atomique
InventorsFranck Jousse, Philippe Mazabraud, Abbas Tcharkhtchi, Mark Kearns
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Abstract
A cylindrical element is manufactured by a process which includes depositing successive layers of thermoplastic materials in a cycle by rotation moulding, or by a technique enabling a deposit of successive layers, the cycle including at least one deposit by rotation moulding or by a technique enabling deposit of successive layers at a temperature from 170 to 240° C. The cylindrical element contains at least one layer containing an ethylene-vinyl alcohol copolymer with a density at the above temperature of between 0.94 and 1.4, and a melt flow index of between 1.3 and 4.2 g/10 minutes.
Claims40
A manufacturing process for a cylindrical element, comprising:
- depositing successive layers of thermoplastic materials in a cycle by rotation moulding, or by a technique enabling a deposit of successive layers,
- said cycle comprising at least one deposit by rotation moulding or by a technique enabling deposit of successive layers at a temperature from 170 to 240° C.,
- wherein said cylindrical element comprises at least one layer comprising an ethylene-vinyl alcohol copolymer with a density at said temperature of between 0.94 and 1.4, and a melt flow index of between 1.3 and 4.2 g/10 minutes;
- wherein at least one of the layers comprising ethylene-vinyl alcohol copolymer has a thickness of more than 0.5 mm.
Dependencies are inferred from the claim text.