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Advertisement:Cover Story The ‘CSR+’ Advanced Corona Power Supply


Fitting a corona system with a CSR+ power supply means the converter has the industries’ leading technology, in terms of efficiency, reliability, the most technically advanced, and with more benefits than any other available treater system


polymer substrates is now standard practice for most converting lines such as laminators, flexo and gravure printers. The past few years have seen some


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marked improvements in the production, reliability, machine interfacing and ease of use of corona systems. But now the standards achieved to-date have been re-written, by Corona Supplies, Thame, Oxon, with their CSR+ range of corona power supplies. The CSR+ generation of Corona Power


supply represents an extension of the industry leading standard in reactive power units, the Sherman GXR range. CSR+ represents a significant step forward in terms of efficiency, reliability, functionality, standardisation and ease of use hitherto not seen with existing systems. Nothing has changed, but everything has changed! Resonant load matching the power supply output to that of the discharge treater station has always been the key to reliable, efficient, powerful corona treatment. CSR+ self-matching circuitry automatically tunes to load conditions (the treater station), using an output frequency operating in the range 10-25kHz. The sophisticated automatic matching circuitry enables the power unit to be 'plug and play' as connection to a different treater station does not require any set up time. Fast over- current detection circuitry prevents output stage damage, as short circuit (dielectric pin-hole), is detected within 1 output cycle. The unit operates from a wide range of 3- phase mains voltages (380V - 460V - 50/60Hz) without additional transformers. More power out for much less input, means a saving to the convertor in terms of quoted power needed, to achieve a desired surface tension level. The CSR+ operator panel incorporates, a menu-driven, touchscreen HMI and Siemens


orona Discharge Treatment at atmospheric pressure for improving adhesion of various


PLC to enable greater control and visualisation of both the power supply and the treater station. Display is separated into three distinct access levels, Operator, Supervisor and Engineer, with password protection for supervisor and engineer levels. Treater station visualisation - A graphical


representation of the actual treater station gives the user instant real time feedback of the treatment process. Fault status with self-help diagnostic information – If a fault occurs the user can instantly call up a screen which details the fault, possible causes and fixes. Recipe’s – Store multiple jobs which can be called up in an instant. Parameters stored include Job title, power control method / set-point and minimum line speed. Power output trend, date stamp – The user can scroll back and check the output condition of the power supply at any point in the past, and event-log of all past corona parameters It is now possible to highlight exactly where in a given reel of film, changes in the settings of the treater occurred, eliminating the need to scrap complete reels due to treating errors, a treatment quality guarantee. Remote control – The HMI screen can be located many meters away from the power supply enabling the control to be integrated into an existing desk or the power supply cabinet to be located in a separate location to the treater. This flexible and upgradeable controller


incorporates; menu driven treater control software which has a real time treater status window visible at all times with comprehensive power analysis displayed on the operator screen showing power in kW, kVA, Watt density, output voltage, output current and invertor operating frequency. Interlock status is individually monitored, machine line speed measured and displayed in the real time window, along with 20 programmable treatment/ film recipes, all multi-language supported allowing storage of treater data for individual films/ production runs. The integrated Siemens PLC, allows seamless addition of corona control functions, previously achieved only with the addition of extra hardware. Functions such as; Closed loop Watt


Density/Power factor control – maintaining 8 July/ August 2019 convertermag.com


a specific power per unit of film area, and changing output power with changes in line speed. Another feature is Splice control – lifting the discharge electrodes only at the correct moment minimising un-treated film length as the splice tail passes through the treater station. This ensures no damage to the discharge electrodes. There is also a Skip treat function, setting


a treatment pattern not only across the film width but in the machine direction, leaving heat-seal lines non-treated ensuring much stronger welded films. Communications protocols such as; RS232, AS-I, Profibus, Industrial Ethernet, CanBus are available to allow the CSR+ corona power supply to deliver real-time data and control to production line computers for ease of customer access and interface. We cannot control dyne level drop-off


over time, due to the effects of additives, crystallinity, and storage conditions. Storage time can be reduced in order to minimise drop-off. However, this still does not guarantee that good adhesion will be obtained on the converting line. Mounting a corona treater in-line, can give the converter a form of “insurance” that desired results will be obtained, and a previously treated substrate will re-treat more easily than untreated materials, even where the surface energy level has decayed since the original treatment. This permit’s smaller treating equipment to be fitted to the line than would be the case with material not treated at the manufacturing stage. Fitting a corona system with a CSR+


power supply means the converter has the industries’ leading technology, in terms of efficiency, reliability, the most technically advanced, and with more benefits than any other available treater system.


coronasupplies.co.uk


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