4. Required injection pressure
In order to achieve the necessary injection pressure, Rompa’s machines are equipped with different screw-cylinder combinations. If necessary, the screw-cylinder combination is adjusted to provide the desired speed and pressure during the injection phase.
5. Available capacity
A product is assigned to a machine depending on the required capacity. Products in high demand, which require a lot of capacity on an annual basis, are given their own dedicated machine at Rompa.
6. Cycle time
The cycle time also factors into the choice of machine. Products with a short cycle time require extremely fast injection moulding machines, the so-called sprinters. These are specialist machines that are more expensive to purchase and maintain.
7. Robotic handling
The plastic product can already retain its shape, but it has not cooled down entirely yet when it is ejected from the mould. This means it can get damaged during the ejection. In that case, we transport the plastic product from the mould to the conveyor belt with a robotic arm. This means there must be room for the robot near the injection moulding machine.
8. Core pullers
A mould can feature multiple hydraulic or pneumatic sliders. Each motion requires a separate core puller. The number of motions an injection moulding machine can control depends on the number of core pullers. The machine must have enough core pullers to control all sliders.