Engineering

Polymer manufacturing processes

Introduction to Polymer Processing The conversion of raw polymers into finished products involves a series of steps. The first step consists of mixing additives into the polymer to achieve the required modification to the properties of the raw polymer. The …

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Introduction to Polymers

Introduction to Polymer Classification The family of plastics materials is closely related to two other important families of manufacturing materials, textile fibres and elastomers (rubber), in that they are all based on carbon (organic materials) and they consist of extremely …

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Polypropylene: the Workhorse of the Plastics Industry

Polypropylene. Little did Karl Zeigler or Giulio Natta realise, 60 years ago, when they were developing a catalyst system to produce a useful thermoplastic from the inexpensive monomer, propylene, that their work would have such far reaching consequences.     …

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Polypropylene: the Workhorse of the Plastics Industry

What determines friction between thermoplastic components?

Friction is an important property for thermoplastics in bearings and gears but also has a part to play in assembly of plastic parts (snap-fit and interference-fit) and ejection during moulding. When two surfaces rub together the resisting force is the …

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What determines friction between thermoplastic components?

What makes medical grade plastics so special?

Toughness and transparency are important properties for the constituents of intravenous lines. However, chemical properties and biocompatibility are paramount for medical grade plastics, which, compared to normal grades, have to comply with a barrage of regulatory tests. This is achieved …

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What makes medical grade plastics so special?

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

What causes mouldings (and moulders) to be off-colour?

When mouldings are not the intended colour, the first thing to check is the raw material, particularly the dosing rate, if you are using masterbatch, and the quality of regrind. The change of colour may make the mouldings more yellow …

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What causes mouldings (and moulders) to be off-colour?

Transparent ABS can be a clear winner

Transparent ABS. Mentioning transparency in the context of ABS moulding materials can raise a few eyebrows. This is because ABS is normally taken to be opaque and indeed the vast majority of grades of ABS are opaque.       …

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Transparent ABS can be a clear winner

Understanding the difference between SBS & SEBS thermoplastic elastomers?

The difference between SBS and SEBS thermoplastic elastomers explained. Over half a century ago, as I watched a fellow research student produce fascinating colours in his reaction vessel, as he prepared block copolymers using anionic polymerisation, little did I realise …

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Understanding the difference between SBS & SEBS thermoplastic elastomers?

Is MFR really much help to moulders these days ?

┬áMelt Flow Rate (MFR) Often a moulder has to change material grades. One of the first properties to be consulted on the new data sheet is usually the MFR. This is to establish if the new grade has the same …

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Is MFR really much help to moulders these days ?

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