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Thermo laminating at Van Pelt's.


Van Pelt's of Lummen, Belgium has increased productivity using a 2,300mm width calender thermo laminating line from Hymmen directly combined with a Wemhoener slitter. The total plant was engineered by Hymmen.

In view of the requested high-quality output, there is a well-planned feeding line at the beginning of the laminating line. The feeding place located by the fork lifts has rest pile removal space on its right side and buffer space on its left side. A lifting table lowers the buffer space onto a bottom level, where the new pile comes into the feeding field while the rest pile is being removed by rakes. After removing the last panel, the new pile is moved via the lifting table into the feeding level while both of the side rakes go down again and take position below the new pile.

At the next station, individual panels are centered and aligned on the left side. The actual laminating line, the heart of the entire plant, begins at the conditioning heater in front of the brushing machine. There are two more heating pairs between surface cleaning and curing stations. Contrary to the usual procedures, the hardener (10-12g/[m.sup.2]) is applied first, and then the glue (40-60g/[m.sup.2]). This sequence is important because the transportation marks in the drying glue, on the bottom side of thin particleboard, may show through the laminating film.

The drying hardener (Malein-acid) is covered with glue (aminoplast Resine UL 39 from Borden), which comes under the line pressure of the first main press calender without further heating. An important advantage of calender thermo laminating becomes very clear at this point: the decorative papers only come into contact with the wet glue under line pressure. In the case of cycle presses, the papers lay for a relatively long time which can cause local swelling.

Before entering the laminating line, the panel distance is adjusted to exactly 25mm by which the narrow flow between two feed fields is dissolved into individual panel distances which vary from one to the other. After application of the hardener, an impulse counter measures individual distance and transmits this data to the tacho-motor for feed of the gluing machine. Following this step, the gap is recognized optically, signalled to the tacho-motor, which then speeds up to compensate for the difference in measure.

The precisely centered film rolls go into two unwind carriages - top and bottom. Both film webs are scanned on the sides; deviations are corrected by moving the unwind carriages. Van Pelt's does not use automatic roll change as changing takes only 3 minutes. The machine runs ultrafine WKP paper of 60 g/[m.sup.2] at a feed speed of 24m/minute. Line pressure under the main press calender is 1,000 N/[cm.sup.2], under the embossing calender 1,500N/[cm.sup.2] and under the smoothing calender again 1,000N/[cm.sup.2].

Knife disks at both the top and bottom positions separate the film web by a diagonal cut in the panel gap. Behind a free wheeling space, a vertical buffer takes up to 18 individual panels for the strip saw which follows immediately, in case of set-up or shut-down times.

The saw itself is a new construction of four saw carriages which can be positioned as needed. If required, the number of saws can be doubled. They operate with pre-making saws from below which can be parked laterally outside the production line. Following another free-wheel zone, the strips are piled on the right and left and moved onto an electrical cross transfer with individual strip transport into the roller buffer.

The energy balance of the calender thermo laminating line is also clear because the process heating (roll heating) is electric. With a feed speed of 24m/minute, consumption in summer is only 0.10 KWH/[m.sup.2] for both sides of the laminated panel. Depending on room temperature and conditioning of the supporting panel, this value may be little bit higher in winter.

PHOTO : Van Pelt's has greatly expanded its overlaying capabilities since installing this Hymmen calender thermo laminating system.
COPYRIGHT 1991 Vance Publishing Corp.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 1991, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

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Title Annotation:Belgian company who work with particleboard
Publication:Wood & Wood Products
Date:Apr 1, 1991
Previous Article:How to find particleboard defects.
Next Article:The benefits of continuous pressing.

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