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Injection moulding

Injection moulding is an extensively used manufacturing process that is used to shape plastics into usable parts. Different polymer types can be used in the injection moulding process to make parts for various end markets such as:

  • Automotive
  • Food packaging
  • Cosmetic packaging and
  • Household applications
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IncroMold enhancing your moulding process

Croda Smart Materials
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Why are additives needed in injection moulding?

Convertors want to ensure their machines are continuously running at an optimal and sustainable level and producing high quality parts with no defects or rejects.

Polymers naturally exhibit high friction which can result in longer cycle times, machine wear and articles sticking to the mould during production, leading to increased post-industrial waste. Post production, parts can scratch easily resulting in poor quality or reduced lifetime of parts.

Most plastic materials are electrical insulators and have the ability to support high static build up, which can cause shocks during moulding and dust attraction on the finished part.

Polymer additives are essential to improve the process efficiency and end product quality. Our speciality polymer additives have been innovatively designed to deliver performance and sustainability benefits suitable for the injection moulding process.

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The natural high friction of polymers can mean that scratching and scuffing can easily occur on moulded parts, during transport, handling and in use. 

Additives can be used to reduced scratching and scuffing in parts to ensure a high-quality look is maintained throughout the lifetime of the part. This can be especially useful in applications such as automotive interiors, household appliances and high-end cosmetic packaging.

Our range of anti-scratch additives work by migrating to the surface of the polymer to reduce friction, scratch width, depth and whiteness, resulting in an overall less visible scratch. Polymer specific additives are added at low levels to give high levels of scratch resistance with no impact on physical properties, colour or clarity.

Learn more about our anti-scratch additives
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We have anti-static solutions suitable for single layer or multilayer films to help dissipate static build up. We offer a range of solutions for different film applications and polymer types, which include:

  • Atmer short- and medium-term migrating additives for reduced dust attraction. These products have wider ranging food approvals and can be used in food and cosmetic packaging.
  • Ionphase inherently dissipative polymers. These are permanent non-migrating static dissipative solutions, which offer static protection for electrostatic protection areas and to meet ATEX standards.
  • Externally coated anti-static additives are products that are applied to the outer surface of a polymer to provide short or medium term anti-static protection. They are often used when internal permanent or migrating additives are not suitable due to clarity, cost or polymer compatibility.
Learn more about our anti-static additives
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Mould release

Our range of mould release additives can be added directly into the polymer melt or via a masterbatch at around 0.5% to give benefits in processing and finished parts like:
Consistent mould release

  • Reduced cycle times
  • Continuous running
  • Improved flow and dispersion of filled polymers
  • Improved surface finish
  • Fewer rejects and waste
  • Reduced machine wear and cleaning
  • Improved pigment dispersion
Learn more about our mould release additives
Would you like to know more about our additives for injection moulding?