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WiPa Plast Compactor

Fields of application

The WiPA Plast Compactor of the PC series is used for gentle processing of thermoplastic materials. In a continuous process the material is heated to its specific softening temperature area which is below the corresponding melting point. The result is a high-quality agglomerate with high bulk density, easy to dose, with lowest possible thermal damage.
Here are some examples for the wide variety of applications of WiPa Plast Compactors for thermoplastic materials:

• Agglomeration of films, fibres, PET flakes, production scrap, foamed materials and powder
• Compacting of any kind of thermoplastic material
• Volume reduction/ increase of bulk density
• Drying of plastics
• Compounding
• Re-crystallization
• Production of free-flowing and dosable bulk material with high density

The process

A feeding systems transports shredded plastic to the buffer container. A stirrer in the buffer container guarantees permanent filling of the worm conveyor and prevents bridging. The worm conveyor pre-compacts the plastic to be recycled and feeds it to the Plast Compactor's disc pair. The disc pair consists of a moving rotor disc and a non-rotating stator disc serving as counter element. Kneading and rolling between the discs creates friction heat and plastifies, sinters and compresses the material.
In this process step the melting point is not reached because the material only reaches a pasty condition and leaves the discs at its own volition. This prevents polymeric decomposition as much as possible so that the MFI (melt flow index) only changes marginally. In this process step finger size agglomerates are created which are cut to the desired grain size by means of a downstream rotary cutter.