| Latest offers in control and IT International Dyer, May 2004 Page 10
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<<prev 1 2 3 4 5 6 7 8 9 10 11 next>> Pick-up Measurement Pleva GmbH has introduced its sixth-generation moisture-measuring devices, AF 310. It says the new device allows the high moisture content of textile fabric webs to be measured without contact, continuously, accurately and reliably. The application moisture content and the differences over the fabric width are determined behind the processing machines for add-on or coating of water-soluble liquors, solutions, paste and foam. The AF 310 is particularly successful in optimisation of continuous dyeing processes when used at the dye padder. This is important when processing with thermosol, pad-steam, Econtrol® and cold pad-batch (KKV) equipment. Problems resulting from these dyeing processes are mainly due to shade inconsistencies along the length of a lot or across the fabric width. Preprocessing steps or the padder itself can be the cause of these. The contact-free measurement of the application moisture, and thus of the dye-liquor pick-up, by means of the AF 310 leads to considerable improvements. It delivers the relevant values at selvedge/centre/selvedge continuously and with lightning speed, explains Pleva sales director Rainer Tuxen. The dyeing process can be monitored and understood, supervised and controlled online. When a padder is used the pressure, and consequently the squeezing effect, can be adjusted sectionally across the width so that the dye liquor pick-up can be automatically controlled. AF310 + Control System The AF 310, with the visualisation and control system CIMATIC PadderControfi- 1 ^, has proven extremely successful for this task, continues Mr Tuxen (see Figure 1, opposite). The CIMATIC PadderControlP^ 8 system processes the values of the dye-liquor pick-up, measured by the AF 310, and controls the squeezing pressures of the dyeing padder. Newly-developed control algorithms increase the reproducibility and the production safety of the dyeing process. Inaccurate dyeing is reduced drastically by means of AF 310 and CIMATIC PadderControlPLus. Additional sensors can be connected to the system (see Figure 2) such as: - R 1: Residual moisture before padder
- RF 110: Intermediate moisture after IR dryer
- TDS 95: Fabric temperature at several points inside hotflue
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