Lenze DSD - Manual (Page 203)

Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
203
7 Applications
7.22 Winding drive for rewinder/unwinder
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7.22.2 Unwinder (single)
Unwinders are used in many production processes. They store continuous material and feed it to a
production process which can be carried out in a continuous or discontinuous manner.
The roller of a single rewinder can only be changed at standstill. The winding drive is braked to
standstill and then accelerated to production speed again after changing the roller. A web accumu-
lator serves to change the roller without the need for a production downtime. When the winding
drive is at standstill, the web accumulator feeds the winding material to the production process.
Materials to be processed are e.g.: homogeneous webs (e.g. paper webs), fabrics, meshwork, wires,
threads or fibres. From a mathematical point of view, the wound up material is a spiral. Depending
on the application range and industry sector, the spiral is called reel, spool, coil or tree.
There are two winding technologies:
• Lay-up winding (e.g. foils, paper, plates).
• Filament winding (e.g. threads, fibres, wires, cables). This winding technology is not supported
by DSD.
The requirements for the winding drive depend on the winding material and may be very high:
• High speed and torque setting ranges.
• Dynamic phase must not have any negative impacts on the tensile force.