Process of reshaping decorated plastic materials

B - Operations – Transporting – 29 – C

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B29C 49/22 (2006.01) B29C 49/00 (2006.01) B29C 49/48 (2006.01) B29C 49/64 (2006.01) B29D 23/18 (2006.01) B29C 49/04 (2006.01) B29C 49/06 (2006.01)

Patent

CA 2201211

A method of reshaping a hollow tube having a circumferential wall defining an inside and an outside of the tube and formed from at least one layer of a thermoformable plastic, with the outside of the wall having at least one decoration, which method includes the steps of juxtaposing one side of the tube with a forming element having a surface in the shape of a pattern, so that the pattern confronts the side of the tube; and heating the tube wall to an elevated forming temperature at which the plastic is capable of being thermoformed and applying a differential fluid pressure to the tube so that the prevailing pressure on the side of the tube opposite the forming element exceeds the pressure prevailing on the side with the forming element, so that the heated tube wall contacts the forming element surface pattern and is thereby formed into conformity with the shape of the pattern. Methods in which a mandrel is used as the forming element are described.

Méthode de reformage d'un tube creux qui a une paroi circonférentielle délimitant l'intérieur et l'extérieur du tube et qui est constitué d'au moins une couche de plastique thermoformable, l'extérieur de la paroi ayant au moins une décoration. La méthode comprend les étapes de juxtaposer un côté du tube avec un élément de formage dont une surface a la forme d'un motif, de sorte que le motif fait face au côté du tube; et chauffer la paroi du tube à une température de formage élevée à laquelle le plastique peut être thermoformé et appliquer une pression de fluide différentielle au tube de manière que la pression prévalant du côté opposé à celui de l'élément de formage excède la pression prévalant du côté où se trouve l'élément de formage, de sorte que la paroi du tube chauffé entre en contact avec le motif de surface de l'élément de formage et prend la forme de son motif décoratif. L'invention décrit aussi des méthodes dans lesquelles on utilise un mandrin comme élément de formage.

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