Rieter

Evenness of the batt sheet

Index

The more even the batt sheet (web) is across its width, the better the clamping effect at the nipper clamping line. Evening-out of the web is therefore of considerable significance. It is very important that the slivers are arranged neatly relative to one another and evenly over the entire working width at the lap machine.

The most effective method of obtaining a high degree of evenness of the sheet is high doubling in sheet form, as in the classical system, a combination of  sliver lap machine and ribbon lap machine. In this respect, the operation of the ribbon lap machine was always ideal in the past. Nowadays, however, the disadvantages far exceed the advantages, e.g. the very high fiber  parallelization. caused by the high drafts in two stages, resulting in insufficient cohesion of the sheet. It does not permit high speeds and therefore high productivity compared with the sliver lap system. The self-cleaning effect also suffers from this high degree of parallelization.