Behind the Scenes of Plastic Injection Moulding at B&C Plastics
As Queensland Manufacturing Month approaches, B&C Plastics invites you behind the scenes to witness the precision and innovation powering our manufacturing process. Watch how raw plastic granules are expertly transformed into a high-quality medical box lid using state-of-the-art injection moulding technology.
Design & Prototyping
The journey begins with a detailed 3D CAD design, crafted by our skilled engineers to meet exact specifications. We then create prototypes using advanced 3D printing or CNC machining techniques to test form, fit, and function. This iterative process helps identify and resolve any design challenges before production starts.
Tooling development
Once the design is finalised, we develop precision mould tools made from hardened steel or aluminium. These moulds are engineered with complex cavities that shape the molten plastic into the final product. Tooling is critical—its quality directly impacts the accuracy, surface finish, and durability of every component produced.
Injection moulding
Raw plastic pellets are loaded into a hopper and fed into a heated barrel, where they melt into a viscous liquid. Our machines then inject this molten plastic into the mould under extremely high pressure to ensure every detail is captured. Colour pigments are mixed automatically to produce consistent, custom colours tailored to the client’s needs.
Cooling & solidification
After injection, the molten plastic cools rapidly within the mould, solidifying into the desired shape. Cooling time is carefully controlled to balance productivity with material properties, ensuring the component is strong, dimensionally stable, and free from defects like warping or sink marks.
Ejection & finishing
Once cooled, the mould opens, and precision ejector pins push the finished part out without damage. Each component undergoes a rigorous quality inspection to check for flaws, followed by trimming of any excess material or flash. Additional finishing processes such as polishing or assembly are completed before packaging.
At B&C Plastics, our expert Engineering and Injection Moulding teams are proud contributors to Queensland’s thriving manufacturing sector — a hub of innovation, quality, and economic growth.
As we celebrate Queensland Manufacturing Month, we honour manufacturers who turn cutting-edge ideas into real-world solutions — driving progress, sustainability, and opportunity across the region.