Polyvinyl chloride (PVC) can be a versatile and resource efficient thermoplastic with the widest range of uses of the plastics family so that it is useful in virtually all aspects of human activity.
Without additives pvc pellet would not be a particularly useful substance, but its compatibility with a variety of additives – to soften it, colour it, ensure it is more processable or longer lasting, produces a broad range of potential applications from car underbody seals and flexible roof membranes to pipes and window profiles. PVC products can be rigid or flexible, opaque or transparent, coloured and insulating or conducting. There is not just one PVC but an entire group of products tailor-intended to suit the requirements each application. Unlike the majority of thermoplastics, nearly all PVC applications have a lifetime which is between 10 and a hundred years. This involves proven durability and stabilisers play an essential part in achieving such performance. All polymers require stabilisers of merely one sort or other; PVC is not any different in this way.
Before PVC can be produced into products, it must be put together with an array of special additives. The fundamental additives for all those PVC materials are stabilisers and lubricants; with regards to upvc compound, plasticisers can also be incorporated. Other additives which might be used include fillers, processing aids, impact modifiers and pigments. Additives pvcppellet influence or determine the mechanical properties, light and thermal stability, colour, clarity and electrical properties of your product. When the additives have been selected, they are together with the polymer inside a process called compounding. One method uses an intensive high-speed mixer that intimately blends all of the ingredients. The outcome is really a powder, known as a ‘dry blend’, that is then fed in the processing equipment.
The next way is to blend the components in either a minimal or high-speed mixer and then transfer the powder into a melt compounder. This can be either a compounding extruder, or any other special equipment for producing pvc compound. These generate a melt which, when cool, is cut into granules ready for processing. In the specialised process, liquid compounds known as plastisols, are made as dispersions of very fine PVC polymer particles in liquid organic media. PVC compounds are created into products using a number of processing methods such as extrusion, injection moulding, blow moulding, calendering, spreading and coating.