Consumables
Low-maintenance exhaust of edge trim waste
Friday 30. May 2008 - Venti Oeldes two types of tearing fans offer convenient solutions for the recycling of edge trim waste that is generated during the manufacture of continuous rolls of paper and plastic film.
During the printing of continuous rolls edge trims are automatically generated that must be removed as part of the process. To do this, Venti Oelde uses tearing fans which offer several advantages compared to solutions using knives.
Tearing instead of cutting
Venti Oeldes tearing fans are extremely robust and low-maintenance. And they do not need to be sharpened regularly, as knives have to be when shredding edge trims. This maintenance effort, and the plant shutdown accompanying it, is reduced to a minimum.
One other advantage of the tearing fans is that no counter-knife is required. The resistance generated when drawing in the edge trims is much smaller as a result. This means that a small dimensioned fan that saves energy in the process is enough. In the end, the entire plant works more productively and achieves optimum economy due to a long life cycle and constant availability.
Collect, shred and transport
The edge trim is drawn in by a vacuum at the point where it is created, shredded continuously in the tearing fan and then routed via the separator into the compactor. The finest dusts created during shredding are also collected and filtered. This is another aspect of Venti Oeldes expertise, as are the optional processes below in which material leftovers are recycled.
Just tear the paper
Normally a standard tearing fan without teeth is enough for edge trim material made of paper. What is decisive here is that the paper has a relatively low thickness and elasticity which is determined by the weight and the amount of cellulose. The material can then be shredded directly in the tearing fan by using an open impeller.
Show the edge trims some teeth
Tearing fans with saw teeth are used for edge trims made of plastic films, composite materials or stiff paper. This is because these materials cannot simply be broken up. Plastics in particular that may have to be heated up and become particularly elastic could not be shredded in any other way. So they need to be gripped in the teeth first and stretched until they tear.
A reliable conveying system
When conveying edge trims, the matching of the individual components is very important. Drawing in, shredding and pneumatic transport must be able both to keep up with the speed of the machine and also correspond to the relevant material. Only in this way can the capability be exploited in order to achieve the highest possible efficiencies with the lowest possible driving power.