Polyvinyl chloride (PVC) is a versatile and resource efficient thermoplastic with all the widest variety of uses of any one of the plastics family so that it is useful in nearly all regions of human activity.
Without additives pvc compound would not be an especially useful substance, nonetheless its compatibility with an array of additives – to soften it, colour it, allow it to be more processable or longer lasting, produces a wide 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 only one PVC but a huge group of products tailor-created to suit the requirements of each application. Unlike other thermoplastics, the majority of PVC applications have a lifetime of between 10 and a century. This involves proven durability and stabilisers play a crucial 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 needs to be coupled with a selection of special additives. The main additives for those PVC materials are stabilisers and lubricants; when it comes to upvc compound, plasticisers may also be incorporated. Other additives which is often 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 happen to be selected, these are blended with the polymer within a process called compounding. One method uses an intensive high-speed mixer that intimately blends all of the ingredients. The effect is a powder, called a ‘dry blend’, that is then fed into the processing equipment.
The second way is to blend the components either in a minimal or high-speed mixer and then transfer the powder to a melt compounder. This could either be a compounding extruder, or other special equipment for creating pvc compound. These develop a melt which, when cool, is cut into granules ready for processing. In a specialised process, liquid compounds called plastisols, are made as dispersions of very fine PVC polymer particles in liquid organic media. PVC compounds are created into products using many different processing methods that include extrusion, injection moulding, blow moulding, calendering, spreading and coating.