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NS Canada | To measure stretch take a marker and mark 2 spots on the roll, then run it onto the bale and re-measure how far apart the marks are now. That will give you how much stretch you are getting.
'Measuring:
To measure that the correct amount of stretch is being achieved, mark or tape 2 points 10 inches apart on the roll after pulling the wrap through the pre-stretcher. Measure the distance once the wrap has been applied to the bale. For conventional film, 50% stretch would mean a reading of 15 inches and 60% would mean a reading of 16 inches on the bale. Measuring neckdown after stretch should not be lower than 24"(for 600mm), 22.8"(for 580mm) and not lower than 16" (for 500mm).'
Although there isn't much you can do to adjust the stretcher - it's determined by the gearing of the rollers.
50% overlap is also fine, as is handling bales right after wrapping, and stacking them. If your plastic can't handle that - use better plastic. | |
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Maiden voyage of the BW150 wrapper - questions abound
