Injection Moulding Injection moulding is a highly automated production process for producing large quantities of identical items. Granulated or powdered.

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Presentation transcript:

Injection Moulding Injection moulding is a highly automated production process for producing large quantities of identical items. Granulated or powdered thermoplastic material is heated, melted and then forced under pressure into a mould. Once in the mould the material cools, forming a component that takes on the shape of the mould cavity.

Extrusion This process can be compared to squeezing toothpaste from a tube. It is a continuous process used to produce both solid and hollow products that have a constant cross-section. E.g. window frames, hose pipe, curtain track, garden trellis.

Blow Moulding Extrusion blow moulding is an automated process that is used extensively to make bottles and other lightweight , hollow parts from thermoplastic materials.

Compression Moulding This is, historically, the oldest commercial plastics moulding process and is mainly used to make products from thermosetting materials. A combination of heat and pressure is used to change the material's form and chemical structure.

Calendering Plastic film, sheet and coated materials such as wall paper and fabrics are produced by the calendering process. It involves rolling out a mass of premixed plastics material between large rollers to form a continuous and accurately sized film. The main material used is PVC, others include ABS and cellulose acetate. PVC ranges from flexible to rigid and the final product is composed of a number of basic materials which must be combined in a uniform mixture of measured ingredients.

Line Bending Line or strip bending is used to form straight, small curvature bends in thermoplastic sheet material. The process is quite straight forward. An electric element similar to that in an electric fire, is enclosed in a channel which has an opening at the top.

Rotational Moulding Rotational moulding is a process used mainly to manufacture hollow shaped products such as footballs, road cones and storage tanks up to 3m³ capacity. As the mould rotates its inner surface passes continually through the mass of powder at the bottom of the mould. The powder in contact with the hot metal fuses and sticks to the mould surface. As the mould rotates more plastic melts and sticks to the inner surface finally producing an even layer up to 10mm thick.