Cutting without a break – Increasing process reliability in sawmills with metal detectors

For the search for splinters in round wood, the metal detector METRON 05 CO is in use at Harperscheid

For the search for splinters in round wood, the metal detector METRON 05 CO is in use at Harperscheid


Cutting without a break – Increasing process reliability in sawmills with metal detectors at I.B.H. Sägewerk GmbH

Apart from hazards due to nails or fence pieces, burdens from the last war are still a problem when processing large logs. The handling of ingrown munition remnants is still part of the daily business of a sawmill on the German-Belgian border, even when processing softwoods. One such sawmill is I.B.H. Sägewerk GmbH in Schleiden. High-performance metal detectors are an indispensable protection mechanism here for productive wood cutting.

Growth on fertile soil

I.B.H.’s history began in 1996, when the works in the district of Euskirchen were taken over. Or, to be more exact, in the small village of Harperscheid as part of the town of Schleiden, which has a population of around 13,500. In these rural surroundings, in the midst of the Rhenish Massif, lie some of the largest forested areas of North Rhine-Westphalia and Rhineland-Palatinate: Hunsrück, Taunus, Westerwald or, directly outside the company’s front door, the Eifel. The forest of Ardenne lies on the Belgian side of the border. Joseph Haas and Roland Jost took over the sawmill for the purpose of manufacturing sustainable materials for industry and construction from the resources of this forest region. The Jost-Haas Group was expanded in 1999 by IBV of Vielsalm, Belgium, and in 2015 by Holz Schmidt of Cölbe. A total of 1.2 million solid cubic metres of timber are processed annually. In addition to the production of lumber, the production of wood pellets is an important part of the value creation today. Around 300,000 solid cubic metres of timber are processed annually at I.B.H. in Germany.

Remnants of the past

The Vogelsang International Place is located just a few kilometres north of Schleiden. This former Nazi “Ordensburg” was erected between 1933 and 1939, but it was never completed. The construction activity was ended by the Second World War. Today it is a place of remembrance and warns against the dangers of ideological delusion. At the same time it is an exhibition site for the impressive natural wonders of the Eifel. Heavy fighting took place in both World Wars in this and the surrounding forested areas in the border region. The Second World War in particular has left a lasting mark on the softwoods. At I.B.H., softwood is processed up to a diameter of 100 cm, smallwood on two canter lines and large logs on a log bandsaw. Spruces with diameters of around 90 cm or more endanger the cutting performance due to their contamination with balls, shrapnel or munition fragments. Smaller diameters may be affected if growth conditions are unfavourable. Also, metals in the form of nails or hunting munition are often found in younger trees.

In particular hard shrapnel made of steel or cast iron is very challenging for modern bandsaws. Loss of sharpness and thus increased maintenance work are the most frequent problems caused by this. A further problem is the possible development of heat and thus the annealing and weakening of the sawblade. In the worst case there is a risk of fire due to flying sparks. Likewise, ingrown metal particles can structurally weaken construction timber. However, this is not reconcilable with the company’s uncompromising quality standards.

Risk reduction strategies

I.B.H. has continually concerned itself with metal detection technology since its founding. “Our equipment is always state of the art. Only in this way can we deliver high quality at a fair price. That wouldn’t be possible with obsolete machines”, says Markus Haas, Member of the Board of Directors at the timber specialist. The tree trunk is examined by a metal detector integrated in the conveying equipment. Trees found to be contaminated with metal are recorded with the exact position and automatically sorted out. At I.B.H. these are completely recycled as waste timber, usually for generating wood pellets. However, expensive raw material is lost in the process, especially when processing large logs. Various solutions and makes have been used in the past, but the results were always unsatisfactory and led to production losses due to false alarms or undetected metals. The absolutely reliable and error-free detection of metals is therefore indispensable. This was then found in a graduated examination with metal detectors from the mechanical engineering company Mesutronic Gerätebau GmbH of Kirchberg im Wald in Lower Bavaria.


After pre-cutting in the log bandsaw, the square timbers are additionally examined by metal detector METRON 05 D

After pre-cutting in the log bandsaw, the square timbers are additionally examined by metal detector METRON 05 D


Only one option for freedom from metals

Following measurement and sorting in the log yard, the trunks first pass through the rotary bark stripper. This also removes metal particles on the surface together with the bark. Immediately after that, the examination for metallic foreign bodies takes place with the splinter detection device of the type METRON 05 CO. Here, contaminated trunks are detected with high precision, marked and subsequently ejected. The machine features excellent shielding against external influences due to electromagnetic and mechanical interference. This makes extremely stable operation possible. The octagonal aperture is also perfectly matched to the geometry of the conveying trough, allowing the size of the detection coil to be minimised.

After pre-cutting in the log bandsaw, the square timbers are additionally examined by a second metal detector from the METRON 05 D series. Since the beam diameter and thus the aperture size of the splinter detector are smaller here, even finer contaminants can be detected. This offers additional safety for the post-cutting and protects the high-performance sawing equipment. “Especially at times of wide fluctuations in the prices of round and square timbers, our customers need absolute reliability at least in their own production process. Since we are ourselves deeply connected with wood in our region, we are naturally only too pleased to make our contribution”, says Christian Boxleitner, Managing Director of Kirchberg-based specialists in foreign body detection.

MESUTRONIC presents itself at the LIGNA 2019

From the 27th to the 31st May the international wood industry meets at the LIGNA in Hanover.

The LIGNA maps the entire value chain of the wood industry. Here is where the top decision-makers and an interested specialist audience from the industry meet. In hall 25 at our booth H 46 we present our reliable and safe metal detectors.

Our specialists are looking forward to many interesting discussions about “Metal Detection Made in Germany”.



MESUTRONIC once again presents reliable metal detectors to the wood industry at the LIGNA

Kirchberg i.W./Hanover. The international wood industry will meet again from 22 to 26 May 2017 at the LIGNA in Hanover. The LIGNA covers the entire value creation chain in the wood industry. This is where the industry’s top decision-makers and interested trade visitors meet.

Mesutronic metal detectors for the protection of production machines

We also have interesting machines for the wood industry at our LIGNA trade fair booth. Our metal detectors and separators will certainly be of interest to top decision-makers in particular, since the use of our devices protects sawing systems, shredders, choppers or pellet presses against harmful metal parts.

Metal detectors save money

We are presenting our reliable, safe, money-saving metal detectors at Booth H 46 in Hall 25. Amongst others we are presenting the METRON 05 D. The separable tunnel-type metal detector is used on conveyor belts and in vibrating trough feeders and material chutes. The detector makes use of practice-oriented and reliable technology that has proven itself in use over many years. The device is quick to mount and provides high detection accuracy, even in the harsh industrial environment. A worthwhile investment that protects valuable production equipment.

METRON 05 VT impresses through price/performance ratio

We are also presenting the METRON 05 VT metal detector for direct installation in the trough of a vibrating trough feeder. The reliable detector is quick and easy to mount in all common trough shapes and impresses with its price/performance ratio.

Our experts will be glad to advise you

Our experts will be glad to advise trade fair visitors on these and other interesting MESUTRONIC metal detectors and separators and we look forward to many interesting technical discussions about “Metal Detection Made in Germany”.

Precise and reliable Metal detectors from Mesutronic protect the processing machines of the industry giant Stora Enso

Somewhere on a round timber yard in South Germany: a gripper places a tree trunk on a conveyor belt, which guides it through a metal detector. Suddenly an alarm siren sounds and the conveying process is stopped – a piece of metal has been detected. This, or something similar, is the common metal detection process in the wood industry. Possible metal contaminants often have to be intercepted before cutting in the sawmill in order to protect the expensive saw blades. But what about the protection of machines in the further processing? The Finnish industry giant in the wood segment, Stora Enso, has relied for years on the proven technology from Mesutronic Gerätebau GmbH from Kirchberg im Wald to protect its production machines. But first things first!

Detection of larger metal parts to protect your production.

Detection of larger metal parts to protect your production.

The Stora Enso company can look back on a hundred years of history and is today one of the largest timber processors worldwide. Its five business divisions generate an annual turnover of around 10.3 billion euros with a total of 28,000 employees. The ‘Wood Products’ segment is one the most successful in the company and is really impressive with a sawing capacity of 5.6 million cubic metres. Part of the Stora Enso family is located in the picturesque town of Pfarrkirchen in Lower Bavaria. This location mainly produces KVH® solid structural timber and Duobalken/Triobalken® beams for the construction industry. Naturally the production also generates waste – the so-called industrial wood residues. These are woods generated as by-products, residues or waste in the woodworking industry. Of course the industrial wood residues are not simply disposed of in the Pfarrkirchen works, but are recycled in a sustainable and environmentally friendly manner. First of all the wood is collected in silos and prepared for the further processing. The first metal detector from Mesutronic is already installed before the collecting containers; it acts, so to speak, as the entrance inspection. It is mounted under a vibrating channel and has the task of detecting larger metal parts that could damage the downstream shredder. And it has been successfully doing just that for over ten years now. After the silo there are in principle two possibilities for further utilisation. Firstly, combustion in the in-house heating plant or, secondly, processing into wood pellets. In the latter case, further processing steps follow that require a great deal of care. The raw materials are ground further in a grinder and fed to the pelletizing plant via a piping system. Then, under high pressure, the material is pressed through a steel die, which has holes in the desired pellet size.

The METRON 05 PowerLine metal detector, in combination with the high-speed TEXREJECT, a highly efficient complete system

The METRON 05 PowerLine metal detector, in combination with the high-speed TEXREJECT, a highly efficient complete system

The high pressure heats up the wood and causes the lignin in the material to liquefy, so that it can act as a binding agent. In order to protect the die, a metal detector with a separation system must be placed before the pelletizing plant. Stora-Enso in Pfarrkirchen thereby utilises a solution from the textile industry. The Metron 05 PowerLine metal detector is combined with the high-performance Texreject separation system to form a highly efficient complete system. The metal detector is mounted in a piping system and checks the ground wood before the separating diverter. If a metal contaminant is detected, the detector sends a signal to the Texreject, which then separates out the contaminated material. The separation of the small fragments of wood in a controlled manner is both a big challenge and new territory in the wood industry. The separator from Mesutronic provides all the conditions required to overcome this difficulty. Thanks to the pneumatic diameter of 500 mm it can cope even with enormous streams of material without problems. With its fast flap opening time of 0.16 s it separates contaminants from the product stream reliably and without interruptions in production and diverts them into a bad material container. Contaminations that occur are, for example, the steel wedge hammers used for marking solid structural timber. These are so hard that they would irreparably damage the pellet die and bring production to a standstill. The reliable and low-maintenance metal detectors and separators from Mesutronic have been reliably preventing that for many years.

MESUTRONIC on the international timber trade fair 2014 in Klagenfurt


The new MESUTRONIC booth with pictured METRON 05 CO splitter detector

The MESUTRONIC GmbH exhibits on the international timber fair in Klagenfurt, Austria. On booth E02 in hall 01, the Company shows metal detectors and Separators for machinery protection and the control of finished products. With these systems, chippers, presses, milling cutters, scalping machines and saws are effectively protected against damage caused by metal foreign bodies. A highlight on the completely redesigned booth is the metal detector METRON 05 VT which serves as a protection of chipping machines. It can be installed directly into the vibratory conveyor trough. Since no metal free zones and no skid plates required, the assembly cost is kept very low. The international timer trade fair n Klagenfurt is helf this year from 04th – 07th September. About 460 exhibitors will present themselves in the fair with gheir products and Services around the timber industry.