Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1996-07-10
1998-04-14
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
15624413, 26417114, 26417316, 26417318, 425462, B29C 4706, B29C 4720
Patent
active
057388148
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method and a device for a continuous or batch extrusion of continuous, consisting of at least two layers, products such as pipes, profiles, plates and foils, as well as the use of the melts co-extruded with the device.
2. Description of the Prior Art
Co-extrusion methods and devices on tools for producing multi-layer products and semifinished goods by extrusion or pultrusion, in the latter case the extrusion process is not interrupted, e.g., a continuous tubing, which is obtained by drawing, are sufficiently well known. At that, in addition to a main extruder, as a rule, a second extruder (additional injector) is used, with which second extruder one or both main surfaces of a product, e.g., a casement section, are covered with a cover layer, e.g., PVC or polymethylmethacrylat (PMMA) when the above-mentioned casement section is covered.
In order to obtain a decorative effect and to solve technical problems, the products, which are produced in the above-discussed manner, have their outer surfaces subjected to a specific treatment to give the products a corresponding appearance or particular functional characteristics. To this end, they are painted, lacquered or provided with a decorative layer, e.g., by flock coating. The treatment of the outer surfaces should, e.g., insure that the outer layer of a multi-layer profile, e.g., its transparence, which may be the case with water absorption, is not distinctly changed, i.e., the products are conditioned by the surface treatment before their further processing. When, e.g., during production of the casement sections, a co-extrusion process of depositing a PMMA on PVC, the oldest of the used methods of surface treatment, is used, a following painting or lacquering of the products is still necessary. Because the application of paint on the sections should be conducted with a minimal speed which far exceeds the section extrusion speed, an "off-line" operation is necessary, wherein one painting device can be used for treating sections from several extrusion lines. The paint is then applied in a continuous apparatus including corresponding stations for rinsing, drying and painting. The application of paint itself is effected indirectly by a rubber roller the advantage of which consists in that the surfaces, which are not absolutely flat, can be flawlessly covered. When the above-described painting apparatus is used for painting casement sections, the decorative layer is obtained, e.g., with the following steps: comparison with an application of a film, a simpler section change is possible. In order to obtain such surface-treated products, increased hardware investments become necessary.
SUMMARY OF THE INVENTION
Accordingly, an object of the invention is a method and a device of the above-mentioned types, with which by extrusion-continuous (pultrusion) or batch, lacquer-coated products, which are improved by simple means, can be produced.
This object is achieved, with respect to the method, by producing at least one layer from lacquer which is co-extruded together with the base material of which the product is made. A two-layer product may consist of, e.g. calciumcarbonate, i.e., CaCo.sub.3, reinforced or filled with glass or carbon fibers-base material, and of an outer lacquer layer, wherein the lacquer is, e.g., a plastic material having characteristics of a lacquer. As it was surprisingly determined by experiments, a lacquer layer can be obtained by an extrusion process. A co-extruded three-layer product can, e.g., have a conventional plastic material as inner layer, an intermediate layer of a colorless lacquer, and an outer color lacquer layer.
At that, the use of a thermoplastic powder lacquer is recommended. Nonetheless, the use of liquid lacquer is not excluded. However, with the use of a thermoplastic powder lacquer, which can also be available in granules, the solvent can be dispensed with, which makes the solid lacquer environment-friendly. As a base material for a thermoplasti
REFERENCES:
patent: 3136676 (1964-06-01), Fisch
patent: 3923743 (1975-12-01), Quiring et al.
patent: 3965845 (1976-06-01), Scheiber
patent: 4182601 (1980-01-01), Hill
patent: 4189520 (1980-02-01), Gauchel
patent: 4510007 (1985-04-01), Stucke
patent: 4900800 (1990-02-01), Halpaap et al.
patent: 5026451 (1991-06-01), Trzecieski
patent: 5063615 (1991-11-01), Chernuchin et al.
Kreth Norbert
Penney Berrie
Wiech Helmut
Witt Reinhard
Battenfeld Extrusionstechnik GmbH
Thurlow Jeffery R.
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