Coating apparatus – Immersion or work-confined pool type – Work extending through pool-confining wall area
Patent
1993-11-30
1996-11-05
Lamb, Brenda A.
Coating apparatus
Immersion or work-confined pool type
Work extending through pool-confining wall area
118DIG18, 425113, 4251331, 425188, B05C 302
Patent
active
055713262
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for coating a filiform material, consisting of an assembly of threads and/or filaments, with a molten organic material.
There already exist a given number of devices known as cabling heads, coating heads or cross heads, which are mounted on the end of an extruder and enable a layer of thermoplastic organic material to be deposited on the surface of a filiform material.
A device of this type is described for example in U.S. Pat. No. 4,713,139. This device substantially comprises a conduit for guiding the material and, at its outlet, an annular aperture through which the organic material is supplied, and which is disposed concentrically to the outlet aperture of the said material.
At its outlet, the organic material is drawn in the form of a cone by the moving material and is applied to the surface of the latter a few millimeters after the outlet.
The principle of this device is to restrict the velocity of advance of the material which, in the above-described example, does not exceed 1 to 2 meters per second. If this velocity is exceeded, there is a risk that the material will no longer be regularly coated, since the organic material is then drawn too violently to enable breakage to be avoided.
EP-A-393 536 describes another type of device, which enables the filiform material to be brought into contact with the organic material inside the device itself. The latter substantially comprises a device for guiding the material at the inlet and outlet, and between the two an impregnation chamber connected directly to the extruder. The material, which in this case consists of a thread formed from a plurality of filaments, is brought into contact with the material under pressure, which can thus impregnate it thoroughly. The organic material is injected into the central chamber at right angles to the trajectory of the thread, which causes it to break up and separates a given number of threads from those adjacent them. The pressure, which is preferably exerted from a single side of the thread, also gives rise to irregular distribution of the filaments within the organic material. This effect is incidentally required.
The principle of this device thus does not itself permit a composite material to be obtained, within which the filiform material has retained its cohesion.
Additionally, in known devices the filiform material is introduced by means of an aperture provided along their longitudinal axis. This method of introduction can cause problems when the material consists of very fine filaments and when it is important to restart the coating process very quickly after a breakage of the said material has occurred.
The object of the present invention is a device which enables a filiform material to be coated, and optionally to be impregnated with a layer of thermoplastic organic material, at a velocity greater than that obtained by means of known devices, and into which the said material can be introduced quickly.
The object of the present invention is also a device which enables a composite material to be obtained, which consists of an assembly of coated threads and/or filaments and is optionally impregnated with an organic material, and within which a regular distribution of the threads and/or filaments is maintained.
The object of the present invention is a device which in particular permits a composite thread to be obtained, of which the core, consisting of a bundle of filaments, is coated with a thermoplastic organic material.
The objects of the invention are achieved by means of a device which is mounted in the manner of a cross head on the end of an extruder and along its axis comprises an inlet aperture followed by a hollow punch, of which the conduit opens into a central duct, the said duct being connected to the extruder by means of a supply chamber, then at the outlet of the duct a die plate, one part at least of this device being movable or removable, and displacement of the said part enabling the said device to be opened and closed along its entire height, from its pe
REFERENCES:
patent: 2198085 (1940-04-01), Le Tourneau et al.
patent: 3467739 (1969-09-01), Underwood et al.
patent: 3676095 (1972-07-01), Stalego
patent: 3694131 (1972-09-01), Stuart
patent: 4194462 (1980-03-01), Knowles
patent: 4406196 (1983-09-01), Roncato et al.
patent: 4614678 (1986-09-01), Ganga
patent: 4623495 (1986-11-01), Degoix et al.
patent: 4688515 (1987-08-01), Rosebrooks
patent: 4713139 (1987-12-01), Ganga
patent: 5011523 (1991-04-01), Roncato et al.
Chang, Yung Yen; Applied Plastic Molding Tools; Second Edition, 1980; p. 32.
Patent Abstracts Of Japan, vol. 5, No. 131 (M-84)(803), 21 Aug. 1981 & JP, A, 56 67 239 (Furukawa Denki Kogyo), 6 Jun. 1981, see abstract.
Patent Abstracts Of Japan, vol. 5, No. 174 (M-96)(846), 10 Nov. 1981 & JP, A, 56 101 839 (Furukawa Denki Kogyo), 14 Aug. 1981, see abstract.
Patent Abstracts Of Japan, vol. 6, No. 36 (M-115)(914), 5 Mar. 1982 & JP, A, 56 150 527 (Furukawa Denki Kogyo), 21 Nov. 1981, see abstract.
Boissonnat Philippe
Loubinoux Dominique
Roy Louis
Lamb Brenda A.
Vetrotex France S.A.
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