INJECTION MOULDING

Injection Moulding

The Injection moulding process creates our plastic products. 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

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COMMON MATERIALS -

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 :

  • Nylon
  • Glass filled Nylon
  • PMMA
  • ABS
  • With metal insert

services -

  • Cost effective tooling
  • Polishing available eg removal of split line
  • Experience of automotive industry standards
Sample Pack

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.

4. Poly (vinyl chloride) (PVC)

Polyvinyl Chloride is perhaps most well-known for its use in residential and commercial property construction applications. Different types of PVC are used for plumbing, insulation of electrical wires, and “vinyl” siding. In the construction business PVC pipe is often referred to by the term “schedule 40” which indicates the thickness of the pipe relative to its length.

5. Polyurethanes (PU)

Polyurethanes are used in the manufacture of high-resilience foam seating, rigid foam insulation panels, microcellular foam seals and gaskets, durable elastomeric wheels and tires (such as roller coaster, escalator, shopping cart, elevator, and skateboard wheels), automotive suspension bushings, electrical potting compounds, high performance adhesives, surface coatings and surface sealants, synthetic fibres (e.g., Spandex), carpet underlay, hard-plastic products, and hoses. The finished plastic products are manufactured using an injection moulding machine.

6. Polypropylene (PP)

Polypropylene is used in a variety of applications to include packaging for consumer products, plastic parts for the automotive industry, special devices like living hinges, and textiles. It is semi-transparent, has a low-friction surface, doesn’t react well with liquids, is easily repaired from damage and has good electrical resistance (i.e. it is a good electrical insulator). Perhaps most importantly, polypropylene is adaptable to a variety of manufacturing techniques which makes it one of the most commonly produced and highly demanded plastics on the market.

7. Polyethylene (PE)

There are several different variants of polyethylene. Low and high-density polyethylene (LDPE and HDPE respectively) are the two most common and the material properties vary across the different variants.
LDPE: is the plastic used for plastic bags in grocery stores. It has high ductility but low tensile strength.
HDPE: A stiff plastic used for more robust plastic packaging like laundry detergent containers as well as for construction applications or trash bins.

8. Acrylic (PMMA)

Acrylic is best known for its use in optical devices. It is extremely transparent, scratch resistant, and much less susceptible to damaging human skin or eye tissue if it fails (e.g. shatters) in close proximity to sensitive tissue.
Nylon (PA)