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WiN woodworking INTERNATIONAL 2020/4

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  • Woodworking magazine
  • Wooden
  • October
  • Timber
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  • Germany
  • Machining
  • Products
  • Processing
  • Filter
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  • Woodworking
  • Harnischcom
WiN - woodworking INTERNATIONAL is the international magazine for the woodworking industry. We report on all aspects of woodworking from board materials, wood treatment to machines, tools and technical know-how, from timber engineering supplies to the latest developments in technologies and markets.

TOOLS FREZITE launches

TOOLS FREZITE launches ”Basics” line The effective solution, at competitive prices, FREZITE presents the ”Basics” line. This is a competitive product range, in which the customer finds a product that fulfils the desired function, but without giving up the quality guarantee that the market associates with the FREZITE brand. The first product in the line is the straight cutter for sizing and grooving wood based materials (coated or not). PCD tools with a spiral milled body to ensure the best chip flow. ”Up & Down” shear design guarantees an excellent cut quality on both sides of the board. FREZITE produces and markets a wide range of cutting tools for most applications in the various sectors of the woodworking, plastics, and composite materials industry. For each of these sectors FREZITE develops optimized solutions that guarantee high profitability in the production equipment and the consequent reduction of production costs in our customers. Founded in 1978, with headquarters in Trofa - Portugal, the FREZITE Group has its own companies in several countries (Germany, Czech Republic, United Kingdom, Spain, Brazil, Poland, Mexico and Finland) and operates supported by an extensive network of agents. From Portugal, FREZITE exports to more than 60 countries in the five continents, setting itself as a Value Industry Partner. www.frezite.com 16 No. 4 • October 2020

SAFETY Flameless explosion venting for mechanical conveyors Q-Ball E guarantees maximum venting efficiency at a minimum weight As a pioneer in developing systems for flameless explosion venting REMBE GmbH Safety + Control has fundamentally changed the world of explosion protection already in the eighties. With Q-Ball E, the German engineers are now presenting a new development, which possesses the potential to revolutionise flameless explosion venting once again. Primarily designed for elevators, the principle of full body flameless venting is taking effect on the Q-Ball E. Thereby, a maximum venting efficiency is guaranteed. Flameless venting is a solution that is both, economical and effective. Different manufacturers use different technologies in flameless venting. Let us have a look at one particular technology: The special flame quenching filter that is used in a Q-Ball E efficiently cools down the flames, preventing the transmission of flames and reducing the external effects like pressure considerably within milliseconds. Furthermore, the flame quenching filter ensures particulate retention. The typical increase in pressure and noise that accompanies an explosion within a building is reduced to an almost imperceptible minimum, thus protecting both, humans and machinery. Using the Q-Ball E, expensive and comprehensive renovations in the building are not necessary. The Q-Ball E is equipped with an integrated signalling unit that alerts the process control system the moment the explosion vent has opened. The design is characterised by another new feature; the extremely low weight of the Q-Ball E. Competitive products with comparable performance will easily have more than twice of the weight. Therefore, the Q-Ball E is ideally suited for installation on components with a low strength and hardly accessible installations. The dimensions of the three available Q-Ball E sizes are designed to fit perfectly on elevators. A sanitary cover protects the Q-Ball E against humidity and dust indoors and outdoors. Nowadays, it is a common industrial standard for flameless explosion venting devices that neither sparks nor flames can exit the respective unit in closed rooms. The dangerous effects of explosions are reduced to a minimum and harmless level. Ideally, production downtimes can be avoided or significantly reduced. www.rembe.de Q-Ball E ‐ Flameless explosion venting. ARCHITECTURE Doors of wood as flood protection? Advance warning time in the event of impending local heavy-rain events is often too short. This causes problems and shows that active flood protection should permanently be in place in endangered areas. In the field of permanent flood protection for the entrance area of houses, a few solutions are known at present, but these are mostly suitable only for the private sector in terms of function and design and only on certain conditions. These usually concern metal-based door constructions, which can be adapted to the static requirements, as well as special seals between the wing and the trim of the door. Can a front door made of wood provide protection against flooding, too? IHD (Institut für Holztechnologie Dresden) staff are currently dealing with that issue in a research project. The challenges in developing an entrance door made of wood with user-independent and thus permanently available flood protection are inherent in the material’s behaviour in water and moisture (swelling and shrinking) and in maintaining high contact pressure to achieve watertightness while retaining its basic properties. There are possible solutions regarding the opening direction and rebate geometry, the door hinge and the doorsill, for example. When flooding is imminent, enormous pressures are caused by the weight of the water. To counter the risk of failure of closing parts caused by such conditions and to use the water pressure to increase the seal, a door construction that opens outwards was favoured instead of the commonly adopted inwardopening design. This construction can withstand increased mechanical loads and guarantees sufficient stability and rigidity through double-rebate door patterns of high profile thicknesses. The selected doorsill has a variable stop allowing defined rebate clearance that can be set using adapter profiles. This allows to achieve sufficient contact pressure between the doorsill and the stop seal. Investigations into watertightness in a highwater test stand especially built for the project, revealed, among other things, that the usually hard-bonded silicone sealing corners do not yield a uniform contact surface, so that water from the outside can penetrate into the rebate. The use of soft silicone sealing corners could significantly reduce the amount of water penetrating the rebate. The first results regarding the watertightness of the final sample doors are promising and are currently being conclusively evaluated. www.ihd-dresden.de No. 4 • October 2020 17

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