| Subject: |
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Re: slitting problem! |
| Name: |
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S Tressed |
| Date Posted: |
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Jan 28, 08 - 2:08 PM |
| Email: |
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stressed@safe-mail.net |
| Message: |
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After checking pressures and ensuring that the sheet travels smoothly through the machine etc....
You don't say if you are slitting 2up work or bolt-trimming say A3-A4-DL to leave 2 x 6pg roll folds nested inside
Don't make the mistake of using a massive size slitter, the blade should protude only a few mm not 5 or 6 mm coz this could mean the slitter is cutting before the collars help to grip the sheet - thus you could be losing full grip/control of the sheet
Also the slitter shaft pressure should be moderate pressure rather than a ton of pressure
check that all folding plates and deflectors are square along with the sidelay or you will be throwing plates and deflectors so far out to compensate
Speed matters - very very often a job 2up or when bolt-trimming, greater control is maintained running the machine as slow as possible with a min sheet gap produces best results whilst still giving a decent output rate
(This applies to many cases of machine trimming, often a Muller saddlesticher's 3 knife trimmer will start to lose accuracy after a certain speed and pressures/timing/brushes will need to be adjusted - or you reside to the fact that a certain speed yeilds the best results for certain jobs)
It could be a number of things but it seems like the sheet is being thrown out by pressure most likely or a bad setting/alignment or wear. A slower speed may help or perhaps using different plates is possible like plate 3 instead of plate 1 for the fold
(you can still use deflector 4 to straighten up the slitting)
Using another plate like 3 or say plate 2 and go down the fold plates isn't the perfect solution but if the machine is worn or until you can identify the actual main problem why the machine may not respond they could be a possible option to try n see
Pressures as always should be set by 1 person and whilst everyone sets their pressures slighty heavier/lighter than others the main thing is that they are even across the roller shaft or at least the area that the sheet is travelling through
(crossfold units will wear more on one side than the other hence I mention the actual area the sheet is travelling through on worn rollers)
On an abused machine that has seriously worn rollers, damaged deflectors, bent slitter shafts from being dropped you will have more problems but there a few things you could try out |
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