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Pulp Paper & Logistics


Double sheet detector saves paper production jams


‘plug-and-play’ double-sheet detector that promises to cut downtime and

scrap for paper and board manufacturers and converters has been introduced by sensor manufacturer SICK. Using ultrasonics, the SICK UD18-2 can be set up easily by the user to be sensitive to a range of sheet thicknesses and to determine whether there are no sheets, or one, two or more layers of material present. It can also check for double layers, splices, labels or glue residues and offers reliable detection independent of the colour, gloss, transparency or reflectivity of the material.

by preventing just one jam, by maintaining machine availability and reducing the need for operator supervision and maintenance. It even picks up stray labels and seams which can cause jams. The UD18-2 comprises a compact

ultrasonic sender and receiver that detect materials from 20 to 2000gm/sqm. LED indicators viewable at any angle indicate clearly whether 0, 1 or two or more sheets are detected, making it easy to monitor double-sheet detections. More information from SICK (UK)

“Mishandling of sheets, missing

sheets or double sheets cause multiple stoppages, downstream roller jams and lost material,”

says Darren Pratt, SICK UK’s distance sensor product manager. “An inexpensive investment in a UD18-2 sensor could pay for itself

LTD, Waldkirch House, 39 Hedley Road, St Albans, Hertfordshire, AL1 5BN, UK. Tel: 44 1727 831121 or email

New quality management techniques for corrugators

A quality-oriented process control system of corrugating machines has been developed by Valmet. It includes a cost- and space-efficient IQ Multipoint Moisture Measurement system and a new camera based IQ Warp Measurement for the combined board flatness control. Previously, process control in

corrugating machines has been based on sheet temperatures due to a lack of suitable moisture sensors designed for their tight confines. Valmet’s experience from paper machine processes has shown that temperature measurements alone are not enough when controlling fibre-based web processes and moisture measurements are needed to maximise productivity and reduce quality defects. Mikko Talonen, business manager for automation at

confines of the corrugating machine. The corrugating process features up to ten drying and re-wetting cycles which, in addition to disturbances such a speed changes and raw material changes, increase variability and unsatisfactory process situations. The IQ corrugator control system

Valmet, comments: “We are now challenging the methods of traditional corrugator control with new technology, methods and concepts in an area that has previously been somewhat ignored by higher level automation. “We have found out that efficient

moisture control in addition to temperature control improves gluing, reduces fluting defects or washboard

and eliminates warp in the final product. Our approach, which emphasizes the cost effectiveness of solutions, is being met with enthusiasm across the industry.” The IQ Multipoint Moisture

Measurement sensor, a key component in the new system, has been developed to meet the need for a simple, small and cost-effective moisture measurement in the tight

can utilise steam and moisture profilers and scanning sensors developed for, and utilised over many years in the paper and board industry. As well as the IQ Multipoint Moisture a new camera based warp measurement has been developed to meet user needs. Valmet’s continuous development efforts, now extended to corrugating operations, promise to provide more innovation for future process and quality improvements. More information from Mikko

Talonen at Valmet. Tel. 358 50 598 9873.

November/December 2016

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