Apparatus for forming foam-skin insulation on telephone wires

Details Apparatus for forming foam-skin insulation on telephone wires Apparatus for forming foam-skin insulation on telephone wires

1980-05-09

1982-01-05

Anderson, Philip

Plastic article or earthenware shaping or treating: apparatus

Distinct means to feed, support or manipulate preform stock...

Extrusion shaping means

264 459, 264 50, 264 53, 264174, 264DIG5, 425 4C, 425209, 425462, 425817C, B29D 2700, B29F 310

Patent

active

043091601

ABSTRACT:
A method of forming a foam-skin insulation on telephone wires, wherein a homogenuous flow of basic plastic is divided into two separate flows one of which is subjected to mixing with a foam agent while the other, intended to form an outer layer of solid plastic, is bypassed directly to an extruder tool. The apparatus used for the method comprises one single extruder, the extruder head whereof is provided with a flow dividing piece guiding one flow past foam injecting nozzles and the other flow through a separate branch channel to the extruder tool.

REFERENCES:
patent: 3782870 (1974-01-01), Schippers
patent: 3820927 (1974-06-01), Toomajanian
patent: 3833325 (1974-09-01), Ramsey
patent: 3860686 (1975-01-01), Myers
patent: 3903233 (1975-09-01), Dougherty
patent: 3905749 (1975-09-01), Suzuki et al.
patent: 3914357 (1975-10-01), Cereijo et al.
patent: 4134687 (1979-01-01), Eckardt

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