FAQ for Experts. Answers by Experts.


Stable production with automatic dew point regulation

When processing plastic, the moisture content of the material is a deciding factor for production safety and product quality. Even more important is a defined residual or processing moisture content of the granulate, as this contributes to stable and precisely reproduceable production conditions. …

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Can automatic air flow regulation save energy?

The comparison of traditional drying systems with more modern versions illustrates many approaches to saving energy. Particularly air flow regulation, possibly combined with lower temperatures, as well as the use of heat exchangers for regeneration and high temperature applications are valuable additional devices in this context. …

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What are the advantages of automatic air flow regulation?

If a drying bin receives more energy than is carried off (through material extraction), the temperature gradient shifts higher, i.e. the material in the bin gets hotter towards the top and can become damaged due to increased dwelling time (image: Motan-Colortronic)

Drying plastics requires a large amount of energy. So, it makes sense to try and find ways of reducing energy consumption where possible – of course, without losing sight of the actual goal: …

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When is a return air cooler necessary?

With a return air cooler the air can be cooled to a temperature below the critical area before it flows into the desiccant bed. (Images: Motan-Colortronic)

In issues 50 and 51 we looked at how molecular sieves – also called desiccant beds – operate and how they are regenerated.


Specifically at high drying temperatures and/or dry air dryers without automatic air flow regulation the temperature of the return air, and then also the temperature of the active molecular sieve, plays an important role. …

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How can re-moisturisation at high air humidity be prevented?

(Picture: Motan-Colortronic)

The following basic principle applies: if plastic granulate is stored in environmental air, its moisture content will adjust to match the moisture present in the air until both moisture contents are the same. …

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What is the purpose of molecular sieves?

Now that we have dealt with the basics of dosing, drying and conveying, we will turn to more specific aspects of drying plastics in the next few issues. …

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How can material stress be reduced during conveying?

The image illustrates the concept of the control: For a smaller material feedline (ø=45 mm) a reduced blower speed (here: 38 Hz) is sufficient; respectively, an increased blower speed is needed for larger feedline

mo explains how material can be conveyed gently
In issues 35 and 37 we described some different forms of abrasion and signs of wear, as well as listed some possible precautions to reduce wear and abrasion. …

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What is a diaphragm valve?

In order to convey material, a solenoid valve (above centre) creates a connection via a hose to the conveying vacuum. This sucks in the diaphragm and opens the valve closure (in green). The vacuum can now reach the material loader (blue arrows) and sucks up the material. If the container is full, the solenoid valve receives another impulse which closes the diaphragm valve.

mo explains the benefits and the mode of operation of diaphragm valves

When manufacturing medical products, parts with delicate surfaces or electrical components, a completely clean production environment is a basic prerequisite. …

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How does the material get from the storage bin into the conveying material feedline?

Variation of material feeding: suction box with two suction points (left), controlled suction box (right)

mo describes different types of material feeding

The way the material to be conveyed is fed into a material feedline depends heavily on the type of material and the conveying principle. …

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How can coupling stations be monitored?

Monitored coupling table with RFID-technology - the hose couplings and the lids of the coupling holders at the coupling table are each fitted with a transponder, the read-write sensors are installed into the casing of the coupling holders

mo describes different concepts for a source-destination mapping

In issue 28 we introduced different multipoint conveying systems, including machine-related conveying systems, which are connected to the different material sources via coupling stations (or tables). …

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