Plastic Injection Molding
Plastic injection molding is a high-volume manufacturing process where molten plastic is injected into a precisely shaped mold cavity, cooled, and ejected as a solid part.
It’s one of the most common ways to make plastic parts in bulk, from bottle caps to car dashboards.
How it works
Material Feeding
Plastic granules (pellets) are loaded into a hopper.
Melting
A heated barrel and rotating screw melt the plastic.
Injection
The molten plastic is forced into a steel mold at high pressure.
Cooling
The mold is cooled (usually with water channels), solidifying the part.
Ejection
The mold opens and ejector pins push the part out.
Repeat
The cycle repeats in seconds or minutes, depending on part size.
Why it’s used
Mass production
Can produce millions of identical parts efficiently.
Low cost per part
Once the mold is made, parts are very cheap to produce.
High precision
Tolerances can be as tight as ±0.1 mm.
Material variety
Works with thermoplastics, thermosets, and some elastomers.
Design flexibility
Complex shapes, textures, and even multi-color parts are possible.
Common uses in manufacturing
4 axle CNC machining shows up in nearly every sector:
Consumer goods
Phone cases, toys, kitchenware.
Automotive
Bumpers, dashboards, clips.
Medical
Syringe bodies, casings for devices.
Electronics
Housings, connectors, switches.
Packaging
Bottle caps, containers.
Why it matters
Plastic injection molding dominates modern product manufacturing because it’s fast, repeatable, and adaptable.
While the mold tooling is expensive upfront (often tens of thousands of dollars), it pays off when making large production runs — lowering the per-unit cost dramatically.
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- ttranseng@bigpond.com
The TTRANS Engineering Guarantee
At TTRANS Engineering, precision drives everything we do. From CNC design and prototyping to full-scale manufacturing, we provide advanced, custom-engineered solutions to meet your exact requirements. Backed by over 17 years of experience and a relentless focus on quality, we deliver reliable results that exceed expectations.
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At our core, we are driven by a commitment to maximum precision. Every component we produce is crafted with meticulous attention to detail, using advanced technology and expert craftsmanship to achieve exact tolerances and flawless finishes. From the first design to the final inspection, we ensure each piece meets the highest standards, delivering results you can trust for performance, reliability, and perfection.
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Outstanding quality to every industry
We bring outstanding quality to every industry, delivering precision-crafted solutions designed to meet the specific needs of each field we serve. Whether it’s aerospace, automotive, medical, or manufacturing, our breadth of expertise ensures consistent performance and reliability. With every project, we uphold the same high standards, providing innovative results that go beyond expectations.