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Just a nice experiment; comment in Russian is obvious
In summary, the conversation discusses a project involving pull rolls for a paper napkin folder. The team tried using S-wrapped rolls to avoid squashing the emboss pattern, but had difficulty with the necessary tension. They ended up using larger rolls covered in tread tape, which worked perfectly at slower speeds. However, at highway speeds, the centrifugal force of the smaller rolls caused them to stop pulling. The team had to adjust the gap between the pull rolls to make the machine work.
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.Scott
Science Advisor
Homework Helper
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At highway speeds, steel belted radials are often heavy enough to stay round even after a blow out.
- #3
jrmichler
Mentor
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I once got tripped up by exactly that effect. The project was pull rolls for a paper napkin folder. We did not want to pinch the paper between a pair of rolls because that could squash the emboss pattern, so we tried a pair of S-wrapped rolls similar to the diagram below.
The input roll of the folder grabbed the paper using vacuum, so could only pull with about 0.3 lbs force. The necessary tension at that point was about 3 lbs in order to keep the web taut after the embosser, and pull it over the folding plows. The tension increase is provided by pull rolls. The proof of concept test used a pair of scrounged rolls about 12" diameter covered with tread tape. It worked perfectly. The actual rolls were about 4" diameter knurled steel. The measured coefficient of friction was 1.7 to 2.0 with the tread tape, and about 0.4 with the knurled steel.
When the machine got up to speed, about 1000 FPM, the pull rolls stopped pulling. It turned out that the centrifugal force was equal to the back tension at that speed with the smaller rolls. The design was locked in by that point, so we adjusted the gap between the pull rolls to nip the paper just enough to make it work. We had hoped to eliminate an operator adjustment, but at least the machine worked.
The input roll of the folder grabbed the paper using vacuum, so could only pull with about 0.3 lbs force. The necessary tension at that point was about 3 lbs in order to keep the web taut after the embosser, and pull it over the folding plows. The tension increase is provided by pull rolls. The proof of concept test used a pair of scrounged rolls about 12" diameter covered with tread tape. It worked perfectly. The actual rolls were about 4" diameter knurled steel. The measured coefficient of friction was 1.7 to 2.0 with the tread tape, and about 0.4 with the knurled steel.
When the machine got up to speed, about 1000 FPM, the pull rolls stopped pulling. It turned out that the centrifugal force was equal to the back tension at that speed with the smaller rolls. The design was locked in by that point, so we adjusted the gap between the pull rolls to nip the paper just enough to make it work. We had hoped to eliminate an operator adjustment, but at least the machine worked.
What is the Russian Commentary on Chain Wheel Experiment?
The Russian Commentary on Chain Wheel Experiment is a scientific experiment conducted by Russian scientists to study the movement of a chain on a wheel. It is also known as the "Chain on Wheel" experiment.
What is the purpose of this experiment?
The purpose of this experiment is to understand the physics behind the movement of a chain on a wheel and to observe the various factors that affect this movement.
How is the experiment conducted?
The experiment involves setting up a wheel with a chain attached to it and observing its movement while changing different variables such as the weight of the chain, the size of the wheel, and the speed at which the wheel is rotated.
What are the key findings of this experiment?
The Russian Commentary on Chain Wheel Experiment has revealed that the movement of a chain on a wheel is affected by various factors such as the weight and length of the chain, the size and shape of the wheel, and the speed at which the wheel is rotated. It has also shown that the chain's movement follows a specific pattern and can be predicted based on these factors.
What are the practical applications of this experiment?
The findings of this experiment have practical applications in various fields such as engineering, physics, and mathematics. It can help in designing efficient conveyor systems, understanding the movement of chains in machinery, and predicting the behavior of other similar systems.
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