As diverse as the products they manufacture are the designs of plastics machinery. A blown-film machine for the production of barrier films, breathable films, films for heavy-duty bags, adhesive tapes or labels looks completely different to an injection moulding machine for the production of children's toys, parts for cases, transparent headlamp lenses or medical parts.
The common feature is the processing of plastic granulate, melting it and forming it. For this purpose, all machines have an extruder screw with heating collars in which the pellets are heated to a melt and which generates the necessary pressure at the outlet. Before being fed to the extruder, the granulate is prepared - by dedusting and drying. Particles and moisture would inevitably affect the quality of the product.
It is obvious that accurate measurement of the melt temperature is a prerequisite for product quality. This temperature must be within narrow limits. On the one hand, there must be the ability to flow, so that the injection mould can be filled completely and quickly, on the other hand, if the maximum temperature is exceeded, the plastic material is damaged.
In addition to the injection moulding machine, every injection moulding process requires an upstream granulate preparation (deduster and dryer). In the machine, subsystems (oil hydraulics and lubrication systems) ensure operational safety. The exact mould temperature is essential for the quality of the products produced. This is kept stable through one or more external temperature control units. In each of these modules and systems, precise, robust and extremely reliable WIKA measuring instruments help to produce high-quality plastic products.