US 2011/0212262 A1 · MULTILAYER COATING APPARATUS AND MULTILAYER COATING METHOD

Abstract

Provided are a multilayer coating apparatus and a multilayer coating method in which an uneven flow can be reduced when two types of resins having different softening points are caused to join together and a wire member is coated therewith. A coating apparatus (10) includes: a first extruder (12) and a second extruder (14); a crosshead (16) for coating a wire member with a resin layer with a double-layer structure; a first nozzle (18) which connects the first extruder (12) and the crosshead (16) to each other; a second nozzle 20 which connects the second extruder (14) and the crosshead (16) to each other; a control unit 22 which controls supply amounts of the first extruder (12) and the second extruder (14); and a heater (24) which heats the second nozzle (20). The second nozzle (20) is longer than the first nozzle (18).

Claims8

Dependent claims

A multilayer coating apparatus which coats a wire member with a plurality of resin layers, comprising:

a first extruder which supplies a first resin;
a first nozzle which is connected to an exit of the first extruder;
a second extruder which supplies a second resin having a softening point different from a softening point of the first resin;
a second nozzle which is connected to an exit of the second extruder and is longer than the first nozzle;
a crosshead which is connected to the first nozzle and the second nozzle and coats the wire member with a first resin layer and a second resin layer;
a control device which controls supply amounts of the first extruder and the second extruder so that a total thickness of the first resin layer and the second resin layer used for the coating is substantially constant and a ratio of a thickness of the first resin layer to a thickness of the second resin layer gradually changes;
and
a heater which heats the second nozzle.

5 more elements

A multilayer coating method for coating a wire member with a plurality of resin layers, comprising:

a step of feeding the wire member to a crosshead;
a first resin supply step of supplying a first resin from a first extruder to the crosshead via a first nozzle;
a second resin supply step of supplying a second resin having a softening point different from a softening point of the first resin from a second extruder to the crosshead via a second nozzle being longer than the first nozzle;
a coating step of coating the wire member with a first resin layer and a second resin layer having a softening point different from a softening point of the first resin layer by means of the crosshead so that a total thickness of the first resin layer and the second resin layer is substantially constant and a ratio of a thickness of the first resin layer to a thickness of the second resin layer gradually changes;
and
a heat step of heating the second nozzle.

3 more elements

Dependencies are inferred from the claim text.

Multilayer coating apparatus and multilayer coating method

Life of this patent

Multilayer coating apparatus and multilayer coating method

Life of this patent

Abstract

Claims8