Injection-moulding – making it in plastic

The injection-moulding process is used extensively across a broad range of sectors, including the automotive, packaging and medical sectors, to make many of the plastic finished products and components in use today. The injection-moulding process is the most commonly used method of manufacturing plastic parts and it is particularly useful for producing high volumes of identical objects. The injection-moulding process also yields low scrap rates compared to other manufacturing processes such as CNC machining which waste a percentage of the original block or sheet of plastic.

The history of injection-moulding

A US citizen, John Wesley Hyatt and his brother Isaiah, patented the first injection-moulding machine in 1872. It was basic compared to machines in use today. Similar to a hypodermic needle it used a plunger to inject plastic through a heated cylinder into a mould, and produced products such as buttons and combs.

Arthur Eichengrün developed the first injection-moulding press in 1919, and in 1939 he patented the injection moulding of plasticised cellulose acetate.

Rapid expansion of the injection-moulding industry took place in the 1940s, as WW2 created a massive demand for mass-produced products. The plastic injection-moulding industry has evolved from the production of combs and buttons to manufacturing finished products and components for many industries including automotive, medical, aerospace, consumer products, toys, plumbing, packaging, and construction.

Injection-Moulding Machinery

A typical modern injection-moulding machines is made up of a raw material hopper, an injection ram or screw-type plunger, plus the heating unit. Presses are rated according to their tonnage, expressed as their clamping force they can exert to keep the mould closed during the plastic injection-moulding process. Tonnages vary from less than 5 tons to over 9,000 tons

Goodfish Group

The Goodfish Group, currently employs 126 people across three facilities, two plants in the West Midlands (Cannock & Worcester) and one in the East Midlands (Loughborough) with plans for a fourth facility in Slovakia by 2019. Our injection-moulding press range now extends upwards to 1,000 tonnes, allowing us to take on a wide range of work, while our vacuum-forming capability provides customers with additional options when considering the development of new products.