Lenze DSD - Manual (Page 198)

7 Applications
7.22 Winding drive for rewinder/unwinder
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Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
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7.22 Winding drive for rewinder/unwinder
7.22.1 Rewinder (single)
Rewinders are used in many production processes. They are able to store continuous material after
the machining process.
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 stores the produced material.
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:
• No impacts on the winding material during the winding process.
• High speed and torque setting ranges.
• Dynamic phase must not have any negative impacts on the tensile force.