There are six basic steps in this manufacturing process
1. Clamping - The mould is clamped together in its closed state
2. Injection - The molten plastic is injected into the tool under pressure, usually using a reciprocating screw device
3. Dwelling - Once the plastic is injected then additional pressure is applied to make sure all the cavities in the tool are filled evenly
4. Cooling - The plastic is cooled and solidifies in the tool
5. Opening - The movable side of the mould is pulled away from the fixed side
6. Ejection - The finished parts are pushed out of the cavities, usually by ejector pins. If you look closely, you often see the ejector pin marks on plastic mouldings
There are many different types of plastic material, suitable for a large range of applications
1. Acrylonitrile butadiene styrene (ABS)
ABS has a strong resistance to corrosive chemicals and physical impacts. It is very easy to machine,
is readily available and has a low melting temperature making it particularly simple to use in
injection moulding manufacturing processes or 3D printing.
2. Polyethylene terephthalate (PET)
PET is the most widely produced plastic in the world. It is used predominantly as a fibre (known by the trade name “polyester”) and for bottling or packaging.
For example, PET is the plastic used for bottled water and is highly recyclable.
3. Polyamides (PA) (Nylons)
Nylon is used for a variety of applications to include clothing, reinforcement in rubber material like car tires, for use as a rope or thread,
and for a number of injection moulding parts for vehicles and mechanical equipment.
It is often used as a substitute for low strength metals in applications like car engines because of its high strength (relative to other plastics),
high temperature resilience, and high chemical compatibility.
We specialise in small high volume plastic mouldings.
We sell many of our injection moulded parts to the Automotive industry, usually accompanied by PPAP3 and IMDS Submission
Common materials used :
carpet underlay, hard-plastic products, and hoses. The finished plastic products are manufactured using an injection moulding machine.
Rubber to Metal Mouldings
O-Rings and Seals
Darac Ltd. Unit 9, Thesiger Close, Worthing, BN11 2RN, UK
Phone: 01903 331391
Company Reg: 03554943
VAT No. GB 717414935