Chemical Foaming Extrusion Line for Foam‑Skin Wire Insulation

High‑frequency data cables and communication wires require insulation materials with low dielectric constant, stable capacitance and lightweight structure. Physical foaming and chemical foaming are two mainstream production processes. Among them, the chemical foaming extrusion line is widely chosen by cable manufacturers for producing Foam‑Skin insulated wires, especially for thin‑gauge electronic cables.

What is a chemical foaming extrusion line?

A chemical foaming extrusion line is a special wire and cable manufacturing machine. It coats conductors with chemically foamed plastic insulation, forming a double‑layer Foam‑Skin structure: a foamed inner layer and a solid dense outer skin.

Typical applications of the line

This equipment is designed for three main extrusion processes:

The extruder adopts optimized screw design. The finished insulation concentricity reaches 93%‑97%. Outer diameter tolerance of solid insulation is ±0.005 mm, foamed skin tolerance ±0.008 mm,

2. capacitance tolerance ±0.5. Consistent wire quality helps cable factories pass strict electrical performance tests.

3. Precise temperature control

Equipped with SCR power controller and imported temperature regulators. The machine barrel temperature fluctuation is controlled within ±1°C. Stable heating guarantees uniform foaming cell size and avoids uneven foam density caused by temperature drift.

4. Higher production efficiency and easier color change

The special screw structure prevents plastic adhesion and chromium peeling. Operators can switch insulation colors quickly without long‑time cleaning. The maximum line speed can hit 500 m/min, with hourly output up to 60 kg, greatly lifting daily production capacity.

5. Compact layout, saves workshop floor space

Traditional foaming extrusion lines separate accumulator, haul‑off, meter counter and spark tester as standalone units. Our machine combines these auxiliary devices into an integrated frame. The overall length is shortened by more than 5 meters, ideal for factories with limited workshop area.

6. User‑friendly operation

Human‑machine touch screen interface and mechanical lever tension control. Operators can adjust wire tension, line speed and temperature parameters conveniently. Built‑in tension monitoring and wire break protection reduce waste and machine downtime.

Main composition of a complete production line

1. Active pay‑off machine: Non‑power active unwinding, adjustable tension, suitable for 300‑500 wire bobbins
2. Main extruder + color injection extruder: Double extruder structure for Foam‑Skin co‑extrusion and color strip marking
3. Movable thermostatic cooling water tank: Dual air wiper, constant temperature water cooling to shape foamed insulation
4. U‑type long cooling trough: 10‑meter cooling section for full curing of plastic foam layer
5. Accumulator: Horizontal or inclined accumulator for continuous production during bobbin change
6. Capstan haul‑off unit and double‑axis take‑up machine: Frequency speed regulation, single/linkage operation, auto stop at preset meter length

How to select the right model

We supply four standard models: Φ40+30, Φ45+35, Φ50+35 and Φ55+40.

Φ40+30: For AWG36‑AWG30 ultra‑thin conductors, max output 25 kg/h

Φ45+35: For AWG32‑AWG28 thin wires, max output 40 kg/h

Φ50+35: For AWG30‑AWG26 conductors, max output 50 kg/h

Φ55+40: For AWG28‑AWG22 wires, max output 60 kg/h

Customers can choose models based on conductor gauge, target output and finished cable electrical requirements. Custom modifications for special foaming formulas are available on request.

Foam‑Skin insulated cables remain in steady global demand. A reliable chemical foaming extrusion line is the key to stable capacitance, low signal loss and low production reject rate.

If you are looking for high‑precision chemical foaming wire extrusion machines for communication cable manufacturing, welcome to contact us for detailed specifications and factory quotation.