What is injection moulding?
Injection moulding is used to make a wide range of plastic products, from engineering components through to consumer parts in all industrys. One of the main benefits of the process is that it is very fast and complicated shapes can be made from thermoplastic polymers.
Injection moulding involves heating the polymer until it is liquid and then using pressure to force it into a mould. Injection-moulded parts can often be identified by their gate point, a witness mark where the plastic was injected into the mould. They may also have a split line visible where the two halves of the mould tool meet.
I am no longer happy with my existing supplier of plastic injection mouldings. Can you utilise my existing tooling to supply my components?
Yes we can. More often than not, there is no need to adapt the tooling however occasionally minor modifications need to be made, for which there is usually no charge.
I may require some assistance with my design, is it possible to meet to discuss my project and would this be invoiced?
Our experienced engineers are here and happy to help with design advice, offering creative solutions to difficult problems. Meet with us for a free initial consultation to discuss the details of your project and to find out how we can help save you time and money. An initial discussion with us will allow you to highlight any areas of concern and will give us a clear understanding of your project requirements and quality expectations.
I have an idea for a new product, but I’m not sure if it can be manufactured. Can PNP help?
Yes we can. Our team have many years experience in the plastics industry so are are happy to work with prospective clients to evaluate the technical feasibility of your design. We offer advice on materials, tooling and likely set-up costs.
What is the typical process for a new project?
1. Review Meeting: Discussion around design and application
2. Quote both for tooling and per part
3. Make tools and procure material
4. Set up Quality Documentation, Method sheets, Jigs and fixtures as required
5. Sample, measure and document as required for customer approval
6. Commence production
How do I identify the best mould tool configuration for my mouldings?
You give us an indication / estimate of how many mouldings you will need per month / annum and we will revert back with the most economical layout/materials for your tooling.
Mould tools can be either single impression (one part at a time) or multi-impression (2, 4, 8 or 16 parts at a time). Single impression tools are generally used for small quantities, up to 10,000 parts per year whereas multi-impression tools are for larger quantities. We review your projected annual requirements and recommend which would be best for you.
How do I get competitive quotations for tooling?
We are very competitive as we are toolmakers and injections moulders – we’re a complete solution service for all your injection moulding requirements.
What materials can you use?
Click here to see the list of Materials we frequently use in plastic injection moulding.
If you want to use a different material that is right for your component, then please send us the details of your enquiry.
Material selection is an essential part of the process and is something that we can help with. When reviewing material, there are a number of variables to consider including application of design, the environment in which it will function, durability, temperature range, water resistance, colour, surface finish, clarity and cost. We have experience of working with a wide and extensive range of thermoplastics and are more than happy to share this knowledge. We can advise on the correct type, grade and colour of material for your components and discuss options for supply.
I want a specific colour for my mouldings. Are you able to colour match to a sample?
In the majority of cases, yes we can however this will depend on the base material.
What sort of finish can I have on my mouldings?
Moulded finishes are usually textured, matt or polished.
Can I have metal inserts fitted into my components?
Yes, we often supply mouldings with inserts fitted. There are various methods to achieve this including ultrasonic welding, heat pressing and over moulding.
Can I have a model made before ordering tooling?
Yes. Models can be made from CAD files using various methods from 3D printing to CNC machining.
Do you charge for a faster service?
No, we always offer our fastest turn around and lead times, these will be agreed with you at the start of your project.
Do you ask me to change my design?
We may recommend changes for commercial reasons however these will be discussed fully with you and will not be implemented without your approval.
Who owns the tooling?
Once the tooling has been paid for in full, ownership of the tooling transfers to the client.
If I don’t want parts for 6 months will you store the tool?
Yes, we have storage facilities on-site to keep tooling should you require us to produce additional parts in the future.
Can you offer measurement data?
Yes. We have our own Quality Engineering Department with CMM capability which can be discussed at the quoting stage.
Are your manufacturing facilities within the UK?
Yes, we have a tool room and mould shop on site here in the Cotswolds. We encourage our customers to visit our manufacturing facility to discuss their project and to get an insight into how we work here at PNP.
What are the advantages to having my parts manufactured locally?
We provide a quick response to any changes in specification, batch size or material. Any potential issues will be addressed and dealt with promptly and if necessary you can meet with us at our facilities here in the Cotswolds.
My components have been developed on CAD. Are you able to use the drawings?
Yes we can. DWG, DXF, IGES and Solidworks files can all be used to generate quotes, models and mould tools - this can save time and money in producing your parts.
What if I do not have any drawings?
In order to review and discuss your design requirements we ideally need a 3D CAD model or a 2D drawing including dimensions. If you are unable to provide us with this information we can work with you to produce this requirement at an hourly rate.
What is the minimum order quantity for a plastic injected moulded part?
PNP are experts in plastic injection mouldings. Once the tooling has been made we are able to produce a single one-off component if required - but this would be at a premium. As a rough guide, quantities of 1,000-10,000 would give you the most effective unit price.