What's the different between Extrusion and Tubing molds in Cable Production

Comparing Extrusion and Tubing Techniques in Cable Production

• The molds used in cable production have three types of core and mold sleeve combinations: extrusion, semi-extrusion, and extruded tube.

1. Extrusion Type:

Characteristics:

1. - Formed by the combination of an open-ended core and any mold sleeve.

2. - Relies on pressure to achieve post-forming of the product.

3. - Plastic is pressed directly into the cable core, creating a tight and sturdy insulation layer with a smooth surface.

Advantages:

The insulation layer has high insulation strength, and the surface is smooth.

Disadvantages:

1. Difficult core alignment adjustment, is prone to wear, especially when the core or cable core is bent, leading to significant misalignment of the insulation layer.

2. Dependency on molds is high, requiring precision for insulation and alignment, and poor performance in the bending properties of the extruded cable core.

2. Extruded Tube:

Characteristics:

1. Formed by a long-nose core and any mold sleeve, with the core nozzle extended horizontally to the sleeve opening.

2. Utilizes the elasticity of FEP resin for rapid extrusion.

3. Simple operation, easy eccentricity adjustment, and less likelihood of eccentricity.

Advantages:

1. Fast extrusion, suitable for high-speed processes, with a larger cross-sectional area between the core and sleeve determining extrusion volume.

2. Simple operation and easy eccentricity adjustment.

3. Larger core-to-core clearance reduces wear and increases core life.

Disadvantages:

1. Lower density of the insulation layer. Increasing the draw ratio in the extrusion machine can improve compactness.

2. Lower adhesive strength between plastic and core, limiting widespread use in insulation extrusion. Vacuum methods can enhance adhesion, and increasing the draw ratio is useful.

3. Appearance quality is not as good as extrusion-type processes.

3. Summary:

• The choice between extrusion and tubing molds depends on requirements such as insulation thickness, adhesive strength, and appearance quality in cable structures with different coatings.

• The process selection may vary based on the specific structure and coating material of the cable.

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