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Wire and cable equipment in the extruder screw section What are the characteristics?


Section of the screw of the extruder in the wire equipment:

Materials along the screw forward, experiencing changes in temperature, pressure, viscosity, etc., this change in the entire length of the screw is not the same, according to the characteristics of the material can be divided into screw feeding (feeding) section, compression Section and homogenization section.

①, plastic and plastic tri-state

Plastic thermosetting and thermoplastic two categories, thermosetting plastic molding curing, can no longer heat melting molding. Thermoplastic molding products can be re-heated melt molding of other products.

Thermoplastic with the temperature changes, resulting in glassy, ​​high-elastic and viscous flow tri-state changes, repeated changes with temperature, three-state repeated changes.

a. Tri-state polymer melt different characteristics:

Glassy - plastic material appears as a rigid solid; thermal kinetic energy is small, large intermolecular force, deformation is mainly contributed by the key angle deformation; remove the external force after the instantaneous recovery of deformation, is a general elastic deformation.

High elasticity - the plastic material appears as rubber-like material; the deformation is caused by the orientation of the segment, which contributes to the conformational expansion of the macromolecule. The deformation value is large. After the external force is removed, the deformation can be recovered but time-dependent and belongs to the high-elastic deformation.

Viscous flow - the plastic presents a highly viscous melt; thermal energy further intensifies the relative slip movement of the chain molecules; irreversible deformation, which is a plastic deformation

b. plastic processing and plastic tri-state:

Plastic glass state can be machined. High-elastic state can stretch processing, such as drawing textile, extrusion pipe, blow molding and thermoforming. Viscous fluid state can be coated, rotational molding and injection molding and other processing.

When the temperature is higher than the viscous flow state, the plastic will produce thermal decomposition, when the temperature is lower than the glassy state, the plastic will be embrittled. When the plastic temperature is higher than the viscous fluid state or below the glassy tendency, the thermoplastic tends to worsen and destroy. Therefore, when processing or using plastic products, avoid these two temperature zones.

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