Conveying

FAQ for Experts. Answers by Experts.

49

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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48

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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47

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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46

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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45

How can disturbances in the vacuum supply be avoided?

A standby pump replaces the line pump in case of disturbance or servicing

mo explains measures to maintain the vacuum

Disturbances in a conveying system can lead to expensive production downtimes. Regular maintenance of the system can help prevent disturbances. …


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44

What is to be taken into account with regard to the material discharge?

Various concepts of the material discharge flapsmo describes various concepts of the material discharge flaps

One task of the material supply is to convey material to the hopper loader on the processing machine. …


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43

How is the plastic granulate separated from the conveying air?

By increasing the line diameter of the material line (d1) to the internal diameter of the hopper loader (d2), the air speed (red arrows) decreases, while the air volume (yellow arrows) remains the same

mo reveals the secret of the “suspended plastic granule”

In the broadest sense, operation of a hopper loader can be compared with a vacuum cleaner – but with one significant difference: …


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42

How can metallic impurities be eliminated?

The separator shown is installed directly on the extractor of the processing machine. Its sturdy design allows installation of further peripheral units, such as conveying, dosing and mixing units. Via the control unit, the separator can be adapted to the intrinsic conductivity of the material to be inspected (e.g. additives with metal oxides or rust).

mo explains the use of metal separators

Even the smallest of metal particles in the melt can cause costly damage. There is an extreme danger for nozzles and hot runner systems as well as for the tools, which means waste as well as loss of production. …


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41

How can noise emissions during material handling be reduced?

„Pipe within a pipe system“; the inner pipe is used as the material feed line, the air-filled space in-between the pipes reduces noise emissions and prevents pre-warmed, dried material from cooling

mo explains: methods for quiet conveying

The noise levels during plastic processing are caused by many different sources. In regards to material handling there are two main sources of noise: …


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40

What is a permanent central vacuum?

Example for a permanent central vacuum, installed in motan-colortronic’s new Tech Center in Friedrichsdorf: in the centre two central filters, left two side channel blowers on top of each other

mo explains the characteristics and advantages of a permanent central vacuum
For large productions with numerous material loaders and consequently many delivery points, large throughputs, frequent conveying cycles, and long conveying distances, there are two solutions for automated material supply: …


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