Clifton Rubber is one of the UK’s leading manufacturers of bespoke rubber mouldings and rubber moulded products.
Over our 40 year history we have developed an in-depth knowledge of the design, development and manufacture of rubber moulded products. We manufacture mouldings to suit our customer’s specific needs and have manufactured products for use in a broad range of industries including the Automotive, Medical and Defence sectors among many others.
As a company we work in partnership with our clients during all stages of the process from feasibility to production ensuring we provide a dependable and cost effective solution whilst maintaining our uncompromising product quality.
A sample of rubber moulding projects we have recently completed can be found in the Project Gallery section below.
The general concept for moulding rubber products is to apply heat and pressure to an uncured rubber material in a mould for a specific period of time. This process will induce vulcanization of the compound whilst the rubber material forms the shape of the mould tool cavity.
This capacity mix provides the production flexibility required to manufacture a broad range of rubber products from small parts up to very large parts and from one off prototypes and low volume batch runs through to high volume continuous production runs.
Compression moulding is the most widely used moulding technique due to its simplicity compared to transfer and injection moulding. The process involves placing a preformed blank of uncured rubber compound in the centre of a mould cavity. The mould is then closed and heat and pressure applied to the compound to induce the vulcanisation reaction. During this vulcanisation process the compound will take the form of the cavity resulting in an end product which meets the specific shape required. Once the material has fully vulcanised the mould is opened and the product removed.
Compression moulding is generally suitable for low – medium production volumes where the shape of the end product is relatively simple. It is also the most suitable method when the size of the product is fairly large and requires a long cure time.
Clifton Rubber has been compression moulding products of all shapes and sizes for over 40 years, popular items being rubber blocks, rubber bushes, rubber grommets etc.
Transfer moulding uses similar equipment to compression moulding. The major difference between the two processes is that the mould tool is more complex in design. The transfer moulding process requires a pre-formed blank of raw rubber compound to be inserted into a “pot” in the mould, when the mould is closed the piston will locate in the pot and force the rubber compound from through the transfer holes and into the closed cavity. Once in the cavity the compound will be heated to its specified cure temperature whilst taking the form of the cavity. Once vulcanised the mould is opened and the product removed.
Transfer moulding is used generally for low to medium volume production runs but is more suitable than compression moulding when moulding complex shapes. Also the process is more suitable when over-moulding other materials such as metals or fabrics.
Clifton Rubber’s vast experience of transfer moulding products means that when it comes to manufacturing a product for our customers we can guarantee a high quality. Typically we can transfer mould rubber to metal or rubber to fabric bonded items such as engine mounts, tipper blocks, pump diaphragms etc.
The significant difference when comparing rubber injection moulding to transfer and compression moulding is its ability to be fully automated therefore reducing the requirement for skilled operatives to be present at all times in the process. The injection moulding process requires uncured rubber compound strips to be directly fed into the injection unit. The injection unit heats and plasticises the material which is then injected directly into the closed mould tool. Using gates and runners the material flows into the cavity (or multiple cavities) and once the material has fully vulcanised the mould opens and the parts are ejected.
Injection moulding is used generally for high volume production runs of both simple and complex shapes. The mould tools required are generally more complex in design than transfer or compression moulds but the automation of the process and elimination of preformed blanks means that typically unit prices are lower.
Moulded products can be manufactured from any commercially available rubber and in a wide spectrum of colours and hardnesses to suit most technical requirements. Common materials we process include Natural Rubber (NR), Neoprene, Nitrile (NBR), EPDM, Silicone, Viton, SBR and Hypalon.
We have the technical expertise to adhere rubber to other materials including bonding rubber to metals, plastics and ceramics either during the vulcanisation process (hot bond) or after the moulding process is complete (cold bond).
Use the below material table for more in depth information on the various materials we have available and to assist you in specifying the correct material for your product’s use.
Get in Touch with us At Clifton Rubber we pride ourselves on our outstanding levels of service ensuring your experience with us is both productive and stress free. From initial enquiry to project completion one of our team will always be on hand to deal with any of your queries and help manage your technical requirements. For more information on our range of services and products please send us an enquiry using the below form and one of our team will get back to you as soon as possible.