Humidity Humidity affects static build up. “Relative humidity” is the percentage of moisture held in the air compared to the maximum it could hold at that temperature. The reason static is more problematic in cold weather is because of low humidity of the air. If the relative humidity drops below 30%, the static conditions become […]
Category: Delivery Systems
When sheeting carbonless paper, the sheeted stock sometimes wraps around the cutting section. Once we get past this point, we also have difficulty stacking. Do you have any suggestions?
It would appear that static is the cause of most problems. There are several things you can try to prevent material from wrapping around the knife cylinder: Wrap the cylinder with a felt or short nap non-conductive material. Introduce compressed air above the doctor board between the rubber covered nip roll and the knife cylinder. […]
We have a problem when running light weight label stock. The sheets have a tendency to skew in the tape system, and this damages the corner of the sheet as it hits the stacker’s front stop. What can I do to alleviate this problem?
Here are a few suggestions: Check your tape tension to make sure it is the same across the width of the delivery section. You may want to set the lower tapes tighter to support the sheet. Make sure the pinch of the overlap carriage or “stop” wheels are set properly. The nip should be snug […]
We recently sheeted an order of coated paper, and had lots of problems due to static. Do you have any suggestions for sheeting coated stock?
If the problem is in the cutting section, such as the web wrapping around the squeeze roll or the knife revolver, an old trick is to mount a cotton felt across the infeed of the sheeter and then wet it. The dampness of the felt will help to neutralize static, and prevents jam-ups in the […]
We frequently have jam-ups in the overlap section. As a result, our operator compensate by running the sheeter at slower speeds. Is there anything else I can do?
There are several different conditions that could cause this: Check the distance between the overlap carriage (or stop rollers) and the last, bottom high speed roll. If the distance is less than the sheet length, then the tail of the cut packet will hang on the end of the high speed tape section and the […]
What can I do about static buildup when sheeting coated material?
Static bars are the best defense against this problem. Maxson sheeters utilize as many as 5 static bars on a sheeter. One bar is mounted above the rubber coated squeeze roll to neutralize static buildup in the cutter. The remaining bars are mounted in the delivery section, in both the high and low speed tape […]
When sheeting a soft coated material, the Operator notices tape marks. The marks do not extend along the entire surface of the sheet. Where is this occurring, and how can I solve it?
This type of tape mark is likely caused by setting the pinch at the overlap carriage too tightly. To be certain, take samples of sheet packets from the high speed tape section, prior to overlapping and samples in the slow speed tape section prior to stacking. If the cause of the tape marks is the […]
I notice full length tape marks on the cut sheet. Where is this occurring, and how can I solve it?
Tape marks are more apt to happen when sheeting heavier caliper stock and highly coated materials. The markings originate in the high speed tape section at first pinch point of the top and bottom tapes. This problem can be corrected by allowing for more space between the 2 sets of tapes. Reduce the tension on […]
