- Injection moulding processes
- Elastomers and thermosets
Elastomer/rubber and thermoset injection moulding
Efficient processing of special materials
Most people have packaging products or caps in mind when they think about plastics. Thermoplastics are used to produce these parts. But the world of plastics offers more than standard materials. With rubber and thermoset injection moulding, you can process silicone, rubber or thermoset materials. ENGEL has suitable injection moulding technology solutions in its portfolio.
Non-thermoplastic plastics include liquid silicone rubber (LSR), solid silicone (HTV), rubber, and bulk moulding compound (BMC). These materials can be processed by injection moulding, if the machine is designed accordingly. They have one thing in common: temperature control in the machine works differently than in thermoplastic injection moulding. The material is cooled in the barrel while the mould, on the other hand, is heated. Therefore, there are different requirements of the machine design. ENGEL has the right solution for rubber injection moulding with its elast machine series.
LSR (Liquid Silicone Rubber) is processed using the LIM (Liquid Injection Moulding ) method. The silicone is supplied as a homogeneous 2-component material. These two components are supplied by special pumps.
The dosing system is fully integrated into the CC300 machine control.
The pressure conditions are monitored by pressure transducers in the feeding system.
The micro injection unit enables shot weights as low as 0.3 grams.
Products: sealings, straps, switches, dummies, masks
Rubber material is used in the sealing and engine technology. There are many different types, for example ethylene propylene diene monomer rubber (EPDM) or nitrile butadiene rubber (NBR). They are all processed in the same way.
First in, first out (FIFO) injection units ensure high shot weights and low pressure losses.
The ENGEL elast machines are available in horizontal and vertical executions – for easier accessibility.
The easix articulated robot can be fully integrated into the production cell.
Products: sealings, insulators, dampers
Solid silicone rubbers (HTV) are high-temperature crosslinked and differ from liquid silicones in their molecular structure.
High melt quality because the ENGEL roto feeder (hopper) feeds the material without bubbles.
Multi-component injection moulding is possible.
Products: sealings, insulators, electrical components
Production of venting valves for beverage bottles by elastomer injection moulding
No flash, no waste, no rework. Fully automated processing is the basis for the economical production of high-tech liquid silicone products. The video shows the efficient production of venting valves for beverage bottles using rubber injection moulding.
Take advantage of our expertise, machines and technologies. We will be happy to advise you on the design of your production cell.
Thermoset injection moulding
In thermoset injection moulding , components with very high mechanical properties can be manufactured. In addition, thermosets are:
Our injection moulding machines can deal with the special properties of thermosets for injection moulding .. We offer wear-resistant and flexible systems for these challenging materials.
Pellet based compounds and wet polyester (bulk moulding compounds; BMC) pellet based moulding compounds and wet polyesters (bulk moulding compounds; BMC) are usually reinforced with various fillers. These are, for example, minerals, glass or even carbon fibre. This provides them with high mechanical properties.
The ENGEL roto feeder (hopper) supplies the BMC material.
High quality material designs for the plasticising units.
ENGEL offers additional products such as universal injection compression and venting programmes, wear-resistant plasticising units, temperature-controlled nozzles and adequate peripheral equipment.
Products: housings, switches, lamps, electronic components, gear parts