Helvoet also specializes in precision products made in LSR Liquid Silicone Rubber. This processing technology allows short cycle times for high volume production of sealings, membranes, valves etc. Clean surroundings and a precise process control are essential for the quality of the parts. We also produce hybrid parts (2k or k+k) combining LSR with other materials.
Constant quality over millions of parts
Hybrid parts possible
Production and handling in prepared facilities
Our engineers assist you with developing your product
Our process technologies for LSR products
LSR Moulding uses two componentes that are mixed at precise levels before injection into the mould. These liquid rubber components have characteristics of other processed rubber compounds, with the main benefit to you as a reduced cycle time and nearly no waste material. That translates to higher efficiency and more capacity.
Combining two materials in one mould, such as LSR and PPP, is an efficient way to provide high volume components. 2K moulding processes save handling, improve alignment, and offer higher quality finished goods.
A hard component (plastic part) is produced separately and is then inserted precisely by a robot into the mould and overmoulded with the soft component LSR (self bonding LSR). With this technology it is possible to get e.g. structural products with an integrated sealing without the high investment for a 2k process.
We can develop LSR parts from scratch, employing state of the art CAD software and engineering software for FEA and moldflow studies. During development all engineers (development, material, process and application) are involved to ensure a smooth transition to production including the validation of the products.
Our processed Liquid Silicone materials can be grouped in four categories
Standard LSR is available in post cure and Non-post cure types and is suitable for a lot of different applications, including products for the food tech industry.
There are a lot of different resistant LSR types developed. Examples are oil resistant and coolant resistant types, but also fluoridated LSR has been developed for a good resistance to fuels.
LSR types in this category have been designed for a specific function. Examples are self-lubrication, oil sweating, ultra transparent silicone types and grades that have a low coefficient of friction.
Self-adhesive LSR can be used for direct bonding to many different substrates. These materials include metal and many plastic types like PBT or PA.
Post-processing you products after moulding to finetune them
LSR compounds offer challenges removing flash as the material has a very high viscosity and does not easily come off. Helvoet uses techniques such as cryogenic deflashing, tear and dreher to remove the flash that is inherent in the process.
Like a lot of rubber components, also many LSR products can be stamped to separate them from each other or even to form them. Sometimes geometry limits moulding the final shape and in such cases stamping of parts, can be the best and most competitive alternative.
The testing and measuring of LSR parts has to be very precise and controlled as parts are often very flexible or highly transparent. Automatical vision inspection by cameras or automated leakage tests can be essential to assure the zero-defect-quality of your product.
We offer various methods to assemble different components to a final functional product which can be used directly
Some assembly products need to be assembled by hand. Most of these components are clicked together. These products can be a combination of plastic, rubber, lsr and metal parts and are often used in the Automotive , Food and Beverage industries. If required we can offer the assembly of several parts in one of our best-cost-locations and help to reduce the total manufacturing cost for our partners.
Semi-automated assembly is done on a turn table or transfer system. In this case employees are picking and placing products in a carrier for an automatic handling like ultrasonic welding, pressing and clicking, leakage testing, laser coding or vision control. The controls on the product are made both by man and machine.
On an automated dedicated assembly line the products are transported by a bowl feeder and linear feeder. Hereby the component is transported, separated, picked and placed in a carrier on a LCS (Linear Conveyor System) and after placing, the LCS transports the product to the next station. At the end of every assembly step there is an automatic control by a sensor, vision camera, leakage test or a laser coding step. These automated assembly lines are used for ourhigh quantity products to ensure a very high efficiency and quality level.
Using over 40-years of experience in assembly of precision components, Helvoet has developed an own Flex-Line Technology. By utilizing interchangeable modules for each assembly step, Helvoet offers the quality of a fully automated line while it is a flexible and cost effective solution due to lower investment and changeover times. Contact us to get more information about the Flexline.
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