What is the definition of a parison in the context of manufacturing?

The definition of a parison in the context of manufacturing is a hot plastic tube used in blow moulding. This process involves shaping and forming plastic materials into specific structures, typically for hollow objects like bottles or containers.

During the blow moulding procedure, the parison is extruded as a soft, pliable tube of plastic, which is then expanded and molded into the desired shape by introducing air. The flexibility and heat of the parison allow it to conform to the interior of the mold, creating a seamless finish in the final product.

Other options represent concepts that do not capture the specific role of a parison. A finished product from blow moulding refers to the completed item after the moulding process is finished, while a solid form of thermoplastic material indicates a state that is not suitable for the blow moulding process. A type of thermoset polymer is a different category of materials that cannot be remolded once set and is not involved in the blow moulding process. Thus, the correct understanding of a parison is critical for comprehending how blow moulding operates.