US 4,391,218 AGranted

Method and apparatus for forming corrosion-resistant layer and surface electrically conductive layer on cable and apparatus for practicing same

AssigneeSumitomo Electric Industries, Ltd.

InventorsTakahiro Horikawa, Yutaka Hibino, Seiichi Maki

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Abstract

A method and apparatus for forming an electrically conductive layer on a corrosion-resistant layer which covers a cable. The cable is passed through a powder accumulating tank in which are mixed an electrically conductive powder and binder powder so as to allow the mixed powder to initially adhere to the surface of the cable. The mixed powder is then pressed against the surface of the cable first at a cable outlet of the powder accumulating tank and then with a powder applying device in which an endless powder applying belt or cloth is rotated around the cable at a rotational speed dependent upon the linear speed of the cable. The surface of the cable is then heated to melt the binder powder and cause the electrically conductive powder to yet more firmly adhere to the surface of the cable. The cable is then cooled and wound.

Claims6

Dependent claims

Apparatus for forming an electrically conductive layer on a corrosion-resistant surface of a cable comprising:

a powder accumulating tank having an inlet and outlet for passing a cable through said tank through a layer formed by accumulating electrically conductive powder therein to allow said powder to adhere to the surface of said cable, and a cloth pipe in said outlet for pressing said powder against said cable at the cable outlet of said powder accumulating tank;
powder applying means for pressing said powder against said cable with a powder applying belt to cause said powder to more firmly adhere to said cable, said power applying means comprising a rotary unit rotated at a speed in proportion to the speed of passage of said cable through said powder applying means and an endless powder applying belt arranged in said rotary unit in such a manner that said endless powder applying belt is tensioned and presses against at least a portion of the surface of said cable;
heating means for heating without surface contact the surface of said cable to melt binder powder mixed with said electrically conductive powder;
and
cooling means for blowing air onto the surface of said cable for cooling said cable;
said powder accumulating tank, said powder applying means, said heating means and said cooling means being arranged in the stated order.

3 more elements

Apparatus for forming an electrically conductive layer on a corrosion-resistant surface of a cable comprising:

a powder accumulating tank;
a powder applying tank;
a heating device;
and a cooling device arranged in the stated order,
(a) said powder accumulating tank comprising a container provided with a vibrator, said container having a cable inlet and a cable outlet for passing said cable through said container through an accumulated powder layer in said container, a rubber packing at said inlet having an inside diameter smaller than the outside diameter of said cable, said powder accumulating tank further comprising a rubber cylindrical hollow holder positioned at said cable outlet, a powder applying cloth pipe positioned in said cylindrical hollow holder with one end portion of said powder applying cloth pipe extending outside of said cylindrical hollow holder, and a band disposed around said one end portion of said powder applying cloth pipe, said band being adjustable to squeeze said one end portion of said powder applying cloth pipe against said cable;
(b) said powder applying device comprising a rotary unit rotated at the speed in proportion to a speed of passage of said cable through said powder applying device and an endless powder applying belt arranged in said rotary unit in such a manner that said endless powder applying belt is tensioned and presses against at least a portion of the surface of said cable;
(c) said heating device comprising a cylindrical heater having an inside diameter larger than the outside diameter of said cable and means for supporting said cylindrical heater;
and
(d) said cooling device comprising an air blowing ring for blowing air onto the surface of said cable to cool said cable.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/312,457Filed 19 Oct 1981 · division
Priority: JP 54-6514725 May 1979
Granted: 5 Jul 1983
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B05D 7/20
Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying…
H01B 13/0026
Apparatus or processes specially adapted for manufacturing conductors or cables: apparatus for manufacturing conducting or semi-conducting layers,…
Y10S 118/11
Coating apparatus: pipe and tube outside
B05D
Processes for applying fluent materials to surfaces, in general

Family

Serial152,959Parent of this division · filed 23 May 1980
US 4,315,883 AParent of this division
US 4,391,218 AThis patent

From the US filing history. Foreign family members aren’t listed.

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