Polyvinyl chloride (PVC) is actually a versatile and resource efficient thermoplastic together with the widest range of uses of the plastics family which makes it beneficial in almost all areas of human activity.
Without additives pvc granule would not really an especially useful substance, but its compatibility with a variety of additives – to soften it, colour it, help it become more processable or longer lasting, results in a broad range of potential applications from car underbody seals and flexible roof membranes to pipes and window profiles. PVC products may be rigid or flexible, opaque or transparent, coloured and insulating or conducting. There is not only one PVC but an entire family of products tailor-intended to suit the needs of each application. Unlike many other thermoplastics, virtually all PVC applications possess a lifetime which is between 10 and 100 years. This involves proven durability and stabilisers play an important part in achieving such performance. All polymers require stabilisers of just one sort or any other; PVC is no different in this way.
Before PVC can be done into products, it needs to be combined with an array of special additives. The primary additives for all those PVC materials are stabilisers and lubricants; when it comes to soft pvc granule, plasticisers may also be incorporated. Other additives which can 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 the product. Once the additives happen to be selected, these are mixed with the polymer inside a process called compounding. One method uses an intensive high-speed mixer that intimately blends each of the ingredients. The effect is really a powder, known as the ‘dry blend’, that is then fed into the processing equipment.
Another method is to blend the components in both a low or high-speed mixer and after that transfer the powder to your melt compounder. This could either be a compounding extruder, or some other special equipment for creating pvc compound. These create a melt which, when cool, is cut into granules ready for processing. In a specialised process, liquid compounds referred to as plastisols, are produced as dispersions of very fine PVC polymer particles in liquid organic media. PVC compounds are produced into products using a number of processing methods that include extrusion, injection moulding, blow moulding, calendering, spreading and coating.