Polyvinyl chloride (PVC) is really a versatile and resource efficient thermoplastic with all the widest variety of uses of any one of the plastics family rendering it valuable in practically all areas of human activity.
Without additives pvc compound would not an especially useful substance, but its compatibility with a wide range of additives – to soften it, colour it, make it more processable or more durable, generates a wide 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 a complete group of products tailor-designed to suit the requirements each application. Unlike most other thermoplastics, the majority of PVC applications possess a lifetime of between 10 and 100 years. This involves proven durability and stabilisers play a significant part in achieving such performance. All polymers require stabilisers of a single sort or any other; PVC is not any different in this respect.
Before PVC can be made into products, it must be put together with a variety of special additives. The main additives for many PVC materials are stabilisers and lubricants; in the matter of rigid pvc compound, plasticisers are also 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. After the additives have already been selected, they can be mixed with the polymer in the process called compounding. One strategy uses an intensive high-speed mixer that intimately blends each of the ingredients. The effect is really a powder, known as the ‘dry blend’, which happens to be then fed in to the processing equipment.
Another method is to blend the components in both a minimal or high-speed mixer then transfer the powder to your melt compounder. This may be either a compounding extruder, or another special equipment for making clear pvc granule. These develop a melt which, when cool, is cut into granules ready for processing. In a specialised process, liquid compounds generally known as plastisols, are produced as dispersions of very fine PVC polymer particles in liquid organic media. PVC compounds are manufactured into products using a variety of processing methods such as extrusion, injection moulding, blow moulding, calendering, spreading and coating.