Tubing Necking/Stretching Machines
Tubing Necking/Stretching Machines are used whenever there is a need for reducing the outside diameter of tubing made of thermoplastic material. During the process the tubing is heated to a temperature at which the yield strength of the material is substantially reduced. The dimension change is then accomplished by stretching the softened material in the axial direction. These machines feature a modular design and can be easily customized to process a wide range of tubing sizes and materials. The machines employ two basic methods for tubing neck down:
- Contactless heating and stretching; where the tubing surface does not come in physical contact with any tool. The tubing is heated by the radiated heat of heater jaws. The heated section is then mechanically stretched until the desired dimensions are achieved.
- Extrusion die stretching; where the tubing is pulled through a hot, high precision die that is polished to a mirror finish.
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