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Plastic mould tooling manufactured in China
Haitian 160T Moulding Machine with tool in the fixed half Mould Toolmakers

Paul Norman Plastics (PNP)

Plastic Injection Mould Tooling


Proven track record in toolmaking and plastic injection moulding.


ISO 9001 Certified: Guaranteeing high-quality products and processes.


Ensuring your success through competitive pricing, on-time delivery, and transparent communication.


Explore how our four decades of diverse industry experience can benefit you.

Production Tooling: Precision Engineering for Exceptional Results

Using substandard plastic injection moulding tools can result in fluctuating part quality, elevated waste levels, production hold-ups, and escalated expenses. Collaborate with us in advance to sidestep these challenges and guarantee a smooth production flow.

The tooling element is crucial in the realm of plastic injection moulding. The mould tool is the heart of the manufacturing process, and its design and construction are critical to the success of any project. At PNP, we recognise the significant investment that tooling represents and are dedicated to ensuring this investment yields maximum efficiency and quality throughout your project's lifespan

Glass filled polypropylene parts multi cavity tool low quantities
Clear polycarbonate mouldings with textured finish 120T Moulding Machine

We collaborate with leading toolmakers in the UK and China, enabling us to provide expert advice on the best tooling configurations for your specific requirements. From the initial concept to the final tool configuration, we focus on creating tools that streamline manufacturing and enhance production efficiency.

We can offer advice at the Design for Manufacture (DFM) stage, providing expert guidance on factors such as material selection, wall thickness, ribbing, draft angles, undercuts, and side actions. We also optimise runner and gate designs to reduce material waste. For more information on this service, view our Design for Manufacture page.

Utilising advanced mould flow simulation software, we can predict how plastic will fill the mould, identifying potential issues before they arise. This proactive approach ensures a smoother production process and high-quality output

Contact us today with your project details

  • What is Design for Manufacture (DFM) and why is it important?
    DFM is the process of designing products for ease of manufacturing, reducing costs, and ensuring high-quality production.
  • How can DFM principles be applied to my injection moulding project?
    DFM principles can be applied by optimising part geometry, material selection, and mould design to improve manufacturability and reduce costs.
  • What are the key considerations in material selection for injection moulding?
    Key considerations include mechanical properties, thermal properties, chemical resistance, and cost.
  • How does wall thickness affect the injection moulding process?
    Uniform wall thickness is crucial to prevent warping and sink marks and ensure even cooling and solidification.
  • What are the benefits of using ribbing and reinforcement in part design?
    Ribbing and reinforcement can add strength and rigidity without significantly increasing material usage.
  • Why are draft angles important in injection moulding?
    Draft angles facilitate the easy removal of parts from the mould, reducing the risk of damage and ensuring smooth production.
  • How can I minimise undercuts and the need for side actions?
    To minimise undercuts and the need for side actions in plastic injection moulding, you can redesign the part geometry to eliminate overhangs, use sliding shutoffs, consider split moulds that open in multiple directions, incorporate inserts for undercut features, and employ collapsible cores that retract within the mould. These strategies simplify the mould design and reduce the complexity and cost.
  • What role does mould flow simulation play in the DFM stage?
    Mould flow simulation helps predict how the plastic will fill the mould, identify potential issues, and optimise part and mould design before production.
  • How can I optimise runner and gate design to reduce material waste?
    Optimising runner and gate design, including hot runner systems, can minimise waste and improve material efficiency.
  • What is the impact of production volume on tooling and part design?
    Production volume affects tool design, material selection, and cost-efficiency strategies; high volumes may justify more complex tooling for long-term savings. Adding additional cavities for example.
  • How can DFM help in identifying potential cost savings?
    DFM helps identify cost savings by optimising part design, reducing material usage, and simplifying the manufacturing process.
  • What are the common pitfalls to avoid during the DFM stage?
    Common pitfalls include inadequate draft angles, inconsistent wall thickness, poor material selection, and overly complex designs that complicate manufacturing
  • Can design changes be made after the DFM stage?
    Yes, design changes can be made, but finalising the design during the DFM stage is more cost-effective to avoid costly modifications later.
  • What is a projected area and how is it relevant in manufacturing?
    A projected area is a two-dimensional area measurement of a three-dimensional object projected onto an arbitrary plane, important for determining material and size limitations.
  • What is a draft angle and why is it necessary?
    A draft angle is a taper applied to the faces of a part to prevent them from being perpendicular to the mould tool opening, essential to avoid damage during ejection. Recommended draft angles range from 0.5 to 5 degrees depending on the situation.
  • Why is uniform wall thickness important in injection moulding?
    Consistent wall thickness helps in even cooling, reducing warping and shrinkage. However, for adjoining ribs and other features, maintaining a thickness of about 2/3 of the main wall thickness is recommended to prevent sink marks. Consistent wall thickness will also aid smooth flow of material during the injection phases.
  • What are the best practices for avoiding sharp corners in moulded parts?
    Avoiding sharp corners is recommended as they can be points of weakness and may increase tooling costs. Using radiused corners is preferred.
  • What surface finish options are available for moulded parts?
    Surface finishes range from non-cosmetic (visible machining marks) to various cosmetic finishes, including polished surfaces and specialty textures.
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