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 ID: 595374
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Slide1
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.Slide2
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.Slide3
Blow Moulding
Extrusion blow moulding is an automated process that is used extensively to make bottles and other lightweight , hollow parts from
thermoplastic materials. Slide4
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. Slide5
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. Slide6
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.Slide7
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.