machinery feature | Control & instrumentation
Optris devel- oped the CTP3 sensor to
enable precise temperature measurement of thinner films
speed at the slitter/rewinder, continuous length measurement, regulating coating/laminating applications, controlling critical length cutting operations, adjusting roll speeds in flying-splice processes and monitoring web tension of products.
Mini pyrometer The CTP3 is a non-contact pyrometer from Optris that helps to improve the quality of thin plastic films. Temperature is a key physical variable for ensuring quality in film production. However, films with a thickness below 1mm are transparent for standard IR thermometers, so cannot be measured in this way. “We developed this thermometer in order to enable
a precise temperature measurement of thinner films made, for example, of PE or PP,” said Thomas Heinke, head of development at Optris. The pyrometer, which measures in a narrow spectral
range of 3.43 microns, comes in a solid casing and is suitable for retrofitted parts and OEMs. Without cooling, it can be used in environments of up to 75°C and has protection class IP 65. The electronics (420g) are separate from the sensor head (200g) and have easily accessible programming buttons along with an illuminated LCD display. Selection options for the analogue outputs are between 0/4-20 mA, 0-5 V, 0-10 V, thermic element version K or J. Digital outputs available are USB, RS485, RS232 interface, relay outputs, Canbus, Profibus DP and Ethernet. At the same time, the company says that its Gigabit
Hawkeye, from Bobst, helps to cut the number of defects in metallised film
USB server connects its USB infrared cameras and video pyrometers to gigabit ethernet networks. This allows a direct connection between a temperature sensor and a PC with cable lengths up to 100m. The measuring devices can be supplied with power via
Power over Ethernet (PoE). The server enables transmission speeds of up to 1,000Mbit/s, allowing the transmission of high-defini- tion radiometric infrared images with a resolution of 640 x 480 pixels and 32Hz.
Pinhole detection Bobst says that its Hawkeye system helps producers of metallised film to cut the number of defects that can af- fect barrier properties. Pinholes and other defects can affect properties such as water vapour and oxygen transmission rates – meaning that customers will reject the final film. Also, the system can help to ensure that films are made with the correct optical density (OD) coating deposition of aluminium film. Hawkeye can handle both tasks simultaneously – in- line – at high production speeds without compromising the quality of metallization, says Bobst. Its inline OD measuring system is based on the
Bobst Registron module, and eliminates the need for offline checking – further reducing the risk of customer rejects. Hawkeye checks defects throughout the full reel length and provides immediate live feedback alerts to the operator, pinpointing the exact location of pinhole defects inside the vacuum chamber so that corrective measures can be applied to eliminate them. An OD beam and a defect beam together detect,
count and categorise pinholes from 0.1mm in size – as well as scratches on the metallised surface of the film. It is easy to operate and calibrate, and has a simple user interface that can generate reports as PDF files – ensuring full quality control and traceability.
Click on the links for more information: ❙
www.bst-procontrol.com ❙
www.sikora.net ❙
www.mesysgmbh.de ❙
www.isravision.com ❙
www.testingmachines.com ❙
www.ndc.com ❙
www.optris.com ❙
www.bobst.com
18 FILM & SHEET EXTRUSION | March 2017
www.filmandsheet.com
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