Plant for manufacturing a plastic composite profile

Details Plant for manufacturing a plastic composite profile Plant for manufacturing a plastic composite profile

1998-08-28

2001-08-21

Nguyen, Nam (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

Extrusion shaping means

C425S326100, C425S462000, C425S467000

Reexamination Certificate

active

06276915

ABSTRACT:

BACKGROUND OF THE PRESENT INVENTION
1. Field of the Invention
The invention relates to a process for manufacturing a plastic composite profile, of any cross section, having an outer layer or skin made of a first material and at least one inner layer made of a different material suitable for adhering to the skin, according to which process the materials of the profile are coextruded.
The invention relates especially to the manufacture of profiles with a prismatic surface, having differently oriented plane faces joined together in arcs of low radius of curvature, the outline of the cross section of the profile having the shape of a convex, or concave, or convex and concave polygon. The reader is reminded that a polygon is a figure formed by an ordered sequence of segments or sides, each of which has one end common with the previous one and with the following one.
The invention relates more particularly, but not exclusively, to the manufacture of profiles used in the construction industry, for example for door frames, window frames, partition elements and wall coverings.
2. Description of Related Art
A process of this kind is known from document FR-A-2,470,672. This process uses a complex coextrusion head comprising two extrusion nozzles, the cross sections of which have shapes identical or similar to those of the desired sections for the various materials in the completed profile.
The coextrusion head is specific to a particular profile. It is therefore necessary to have as many coextrusion heads as types of profiles to be manufactured.
Now, a coextrusion head comprising at least two nozzles, and sometimes more, for the inlet of different materials is expensive. This entails considerable investment when there are many different sections of profiles to be produced.
Moreover, it is known to manufacture plastic tubes with a composite wall, as taught for example by FR-A-2,455,972, but this document does not provide for the manufacture of profiles with a prismatic surface and with a composite wall.
SUMMARY OF THE INVENTION
First and foremost, the object of the invention is to provide a process for manufacturing a plastic profile with a composite wall which is more flexible than the processes known hitherto and which allows a large number of profiles of different sections to be manufactured with lower investment costs.
It is also desirable for the process to be able to combine at least two layers of material making a particular contribution to the properties of the final profile: for example, a saving by the use of a less expensive material for the inner layer than that for the skin, and/or an improvement in the thermal insulation properties by using a core foamed or cellularized material for the inner layer, while still obtaining the desired properties on the surface (for example, resistance to UV radiation, color, surface hardness, etc.) by a suitable formulation of the material of the external layer or skin.


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Wilschut, J., “Inzamelen Terugkerend Materiaal Moet Nog Geoptimaliseerd. Nieuwe PVC-Kozijnen Uit ‘Oud’ Materiaal”, Bouwwereld, vol. 89, No. 1, Jan. 8, 1993, p. 47, XP000328393 (with English translation).

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