Patterson & Rothwell


1100T Haitian Injection Mould Press – One Year On

Wow! as I sit here writing this article a year to the day that we took delivery of our colossal 1100T Haitian Injection Mould Press – it was so large that during its installation I could easily sit in its jaws. How quickly has that 12 months passed, and more importantly what have we done with it and what have we all achieved?

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How to choose the right Toolmaker for your suite of tools

Design, Capability, Equipment, Leadtime, Experience, Accreditations, Warranty and Off Shoring.

Perhaps the eight most important things to consider when conducting your feasibility study for the suite of tools you are about to contract out. That’s before you think of leaving these shores and going to places like China. Continue reading

In Pursuit Of The Perfect Injection Moulded Part 11 – Flash


Flash is an excess of moulding material that appears as a thin lip or protrusion at the edge of a component. Flash appears because material has flowed outside of the intended flow channels and into the space between the tooling plates or at the injector. pin.

Flash is usually subtle but might be considered a major defect if particularly obvious on a product. The process for reworking a moulded product with flash often includes trimming the excess material. Continue reading

In Pursuit Of The Perfect Injection Moulded Part 10 – Short Shot

Short Shot

A short shot occurs when the flow of molten material doesn’t completely fill the cavities in a mould. The result is that the moulded component is incomplete after cooling. Short shot might appear as incomplete compartments in plastic shelves of a display or missing prongs on a plastic fork, for example. Short shots are typically classified as a major defect that can inhibit the function or appearance of the moulded part. Continue reading

In Pursuit Of The Perfect Injection Moulded Part 9 – Delamination


If you find thin layers on the surface of a moulded part are easily separating or peeling off the underlying material, you’re seeing a moulding defect called delamination. Delamination is a defect characterised by a flaking surface layer, similar to what you’d commonly find on flake mica. This is generally regarded as a relatively serious defect because it reduces the strength of the component. Continue reading