An apparatus and a method for producing an extruded hollow...

B - Operations – Transporting – 29 – C

Patent

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B29C 47/90 (2006.01)

Patent

CA 2280810

Apparatus and method for producing a hollow plastic section (5). The apparatus comprises an extruder (1) which is provided with a die (2), which extrudes substantially in the horizontal direction, for extruding a hollow section (5) made of thermoplastic material, which die (2) has an inner mandrel which forms the cavity in the section, a first sealing plug (12) and a second sealing plug (13), which sealing plugs (12, 13) are situated at a distance from one another downstream of the inner mandrel (3) and are attached to the inner mandrel (3), and which sealing plugs (12, 13) are designed, during operation of the apparatus, to lie in the hollow section, such that they are sealed against the section (5), so that the sealing plugs (12, 13) and the section (5) delimit a compartment (20, 21) in the cavity of the section (5), means (22a, 22b, 23a, 23b) for filling the compartment (20, 21) with a liquid, so that a compartment which is filled with liquid during operation of the apparatus is created. The apparatus is designed in such a manner that the compartment (20, 21) which is filled with liquid has a highest point, and in that the apparatus comprises vent (27, 28) means for discharging from the compartment (20, 21), which is filled with liquid, gas or vapour which collects at the highest point of the said compartment.

L'invention concerne un appareil et un procédé de production d'une section (5) en matière plastique creuse. L'appareil comporte une extrudeuse (1) présentant une filière (2) qui extrude sensiblement dans le sens horizontal, pour extruder une section (5) creuse en matière thermoplastique. Ladite filière (2) possède un mandrin intérieur qui forme la cavité à l'intérieur de la section, un premier tampon d'étanchéité (12) et un second tampon d'étanchéité (13), lesdits tampons (12, 13) étant situés à distance l'un de l'autre, en aval du mandrin (3) intérieur, et étant fixés à ce dernier. Lors du fonctionnement de l'appareil, ces tampons d'étanchéité (12, 13) sont conçus pour reposer dans la section creuse, de façon qu'ils soient appliqué hermétiquement contre la section (5), et que ces tampons d'étanchéité (12, 13) et la section (5) délimitent un compartiment (20, 21) dans la cavité de la section (5). L'extrudeuse comprend également des moyens (22a, 22b, 23a, 23b) permettant de remplir ledit compartiment (20, 21) avec un liquide, afin de créer, lors du fonctionnement de l'appareil, un compartiment rempli de liquide. L'appareil est caractérisé en ce que le compartiment (20, 21), qui est rempli de liquide, présente un point situé au niveau le plus élevé, et en ce qu'il comprend des dispositifs de dégazage (27, 28) destinés à évacuer du compartiment (20, 21) rempli de liquide, les gaz ou la vapeur s'accumulant au niveau le plus élevé précité du compartiment.

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