Plastics production
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. …
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. …
44
What is to be taken into account with regard to the material discharge?
mo 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. …
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: …
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. …
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 (image: …
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: …
39
Which processes are important for material conveying?
Material loader with adjustable fill level sensor (on the glass cylinder) and outlet flap with sensor
mo explains: what is important to consider for time or sensor conveying
The principle of suction conveying relies on the vacuum pump generating a vacuum that is great enough to range through the material feed lines and the material loaders to the material feed. …
38
How do the various vacuum generators differ?
Central vacuum generation station with side channel blowers and safety filters in the background
mo briefly presents the most commonly used vacuum generators in the plastics industry
Part of the heavy workers of pneumatic suction conveying – the precise term for the most important conveying method in plastic processing – are without a doubt the vacuum generators. …
30
What happens with the dust in the conveying system?
Filter: Central filter system with dust collection
mo explains explains security measures against dust contamination
Dust particles can cause a variety of problems in plastics processing, from quality loss and waste to problems during processing. …