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Sensors give accuracy on web tensioning
A
Penny + Giles product story
Edited by the Engineeringtalk editorial team
Feb 15, 2000
Penny and Giles HLP190s (Hybrid Linear Potentiometers) are specified by Valmet Atlas-Winders for the web tensioning systems on their range of paper, film and textile unwind and rewind machines.
Penny & Giles HLP190s (Hybrid Linear Potentiometers) are specified by Valmet Atlas-Winders (VAW) to provide feedback for the web tensioning systems on their range of paper, film and textile unwind and rewind machines.
Valmet Atlas-Winders design and build unwind and rewind machines for the paper, film and textile industries.
The machines, which help to automate the processing of substrates, unwind reels of materials onto printing machines at the start of the processing and rewind the finished materials onto reels when the process is complete.
They also allow splicing and joining of the web whilst it is stationary or moving.
The printing machines run at a constant speed, so the unwind and rewind machines need to maintain tension in the web as the materials are processed.
As the speed changes the Penny & Giles HLPs, which are customised to suit the VAW application, measure small variations in the position of a feedback device called a 'dancer' and feed analogue signals into the winder's drive control system to maintain constant, accurate tension control.
A spokesman for VAW says the HLPs make an important contribution to the quality and accuracy of the control system.
Besides HLPs, VAW also specify Penny & Giles VRVTs for applications where maintenance is made difficult by restricted access.
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