Twin-screw extruders are designed to facilitate mass transfer functions, in particular mixing and devolatilisation. They are commonly used in the production of rigid PVC and wood fiber blends. The machine uses two co-rotating screws: these are mounted on splined shafts inside a closed barrel which interact with each other to create a highly efficient process. There are two distinct types of twin screw extruders, the low speed late fusion type and the high speed energy input.
Historically, twin-screw extruders were used to produce pellets that were then fed into other machines, such as injection molding machines. However, modern techniques often bypass this step and use the twin-screw extruder to create a ready-to-use sheet or profile.
If you’re in the market for twin screw extruders you need to choose a high-quality manufacturer and take the time to find out everything you can about their machines and processes. You can read more here.
Don’t forget that if you want a high-quality product, you need a high-quality machine to produce it. The ideal is to choose a company that takes care of every detail, leaving you with no minor details to worry about. Every detail, from the mechanics to the electronics, must be designed and manufactured according to your specific requirements and with the utmost care.
Factors to consider when looking at twin screw extruders
There are several things to consider before investing in a twin screw extruder:
- Manufacturer reputation
Perhaps the most important starting point is the manufacturer’s reputation. You can ask colleagues in the industry, check Internet forums and even consult the manufacturer’s website. Reviews are especially useful because they should not all be positive. It is practically impossible for a manufacturer to please all customers.
A negative review gives you a chance to see how the manufacturer reacted. This tells you a lot about him, the potential quality of his machines and the support you can expect to receive in case of problems.
- Machine specifications
Once the list of manufacturers has been narrowed down, it is necessary to examine the machines offered. Particularly important is the geometry of the screw. It should be designed to improve efficiency. At the same time, the transmission system should be designed to reduce torque stress, thus decreasing the strain on the machine and prolonging its life. Of course, a twin-screw extruder should also be customisable to ensure that the machine produces exactly what you want.
- Running costs
All machines must be maintained to minimize the likelihood of breakdowns. It is important to know the warranty and guarantee provided by the machine, the amount of annual maintenance and any common machine problems, including repair costs.
This, alongside the likely fuel costs and other running costs, will help you establish a budget for purchasing and running your twin screw extruder. It will make it easier to set the right price point for your products and help to ensure you’re producing something your customers will buy.