Method for producing surface-hardened pmma films which are...

Details Method for producing surface-hardened pmma films which are... Method for producing surface-hardened pmma films which are...

B - Operations, Transporting

29

C

B29C 43/24 (2006.01) C08J 5/18 (2006.01) C08L 33/12 (2006.01) C08L 69/00 (2006.01)

Patent

CA 2312787

An impact resistant provided PMMA moulding material according to DE 195 44 563 is processed into a surface-hardened film which is highly glossy, essentially free of gel bodies and can be processed in the "in-mould-film-decoration" method. The melted mass is generated by means of an extruder and fed to the inventive glazing rolls via a flexible lip nozzle, said rolls being configured in order to generate an especially high locking pressure in the roll slit. The smoothing rolls are cambered. The films are used for decorating surfaces of high-value thermoplastic moulded parts.

Une matière moulable en PMMA résistante aux chocs selon DE 195 44 563 est transformée en un film durci en surface, extrêmement brillant, pratiquement dépourvu de corps gélifiants et pouvant être traité selon le procédé de "décoration dans le moule". La matière fondue est produite au moyen d'une extrudeuse et acheminée à la calandre finisseuse par l'intermédiaire d'une filière à lèvres flexibles, cette calandre finisseuse étant configurée de manière à produire des forces de serrage particulièrement élevées dans l'espace entre cylindres. Les cylindres finisseurs sont bombés. Ces films s'utilisent pour décorer les surfaces de pièces moulées thermoplastiques à résistance élevée.

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