Design

Designing with Plastics

Firstly, designing with plastics can be addressed under four inter-related headings: Function: Will it do the intended job? For how long? Form: Does it have the shape to: Do the function economically? Will it please the user? Does it suit …

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Coping with weld lines

            This article on weld lines was written by Dr.Charlie Geddes for Hardie Polymers. In injection moulding, weld lines (knit lines) form when two melt fronts meet.  If the melt fronts do not coalesce completely, …

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Coping with weld lines

Creepy things can happen with long term loading of thermoplastics.

Deformation defined Deformation is defined as the change in the shape of a body caused by the application of a force (stress). It is proportional to the stress applied within the elastic limits of the material. This article that follows was …

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Creepy things can happen with long term loading of thermoplastics.

The Long and the Short of Fibre Reinforcement of Thermoplastics

Fibre Reinforcement. The advantages of adding glass fibre to thermoplastics to increase stiffness (modulus), strength, heat distortion resistance and dimensional stability are well known. Because of the method of compounding, conventional glass fibre filled grades have fibre lengths of the …

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The Long and the Short of Fibre Reinforcement of Thermoplastics

Do your mouldings suffer from jet lag?

When explaining the moulding fault commonly known as ‘jetting’ to part-time students from the plastics moulding sector, I usually prefaced my remarks by saying that ‘jetting’ was not a fault that you should see these days. Then one of the …

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Do your mouldings suffer from jet lag?

Do Izod and Charpy make the appropriate impact?

This Izod and Charpy article was written by Dr.Charlie Geddes Cracking of plastics components under impact was a major blow to the plastics industry in the early days. Today it is still a challenge for designers to select thermoplastics that …

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Do Izod and Charpy make the appropriate impact?

A Polymer Data Sheet – Just how useful are they?

Every polymer supplier will provide you with a basic data sheet describing the properties of a particular grade.  The good news is that each property value relates to a well understood, repeatable, reliable test related to international standards. Therefore, this …

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A Polymer Data Sheet – Just how useful are they?

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