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WiN woodworking INTERNATIONAL 2021/1

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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.

SAFETY Explosion Safety

SAFETY Explosion Safety Economic explosion isolation with Q-Flap RX flap valve Explosion isolation is absolutely necessary for a comprehensive safety concept. Without explosion isolation, the safety concept is insufficient because: Throughout the industry, vessels, silos and other parts are often connected to each other by pipelines. If a dust explosion occurs in one plant component, this also enhances the risk of flames and pressure propagation to other parts of the plant. Pre-compression and flame jet ignition exacerbate the explosion severity in interconnected vessels. The result is a series of secondary explosions that may result in personal damage as well as destruction of plants. An explosion isolation system prevents deflagrations from propagating and thus minimises the effects of an explosion. Adjoining plant components are optimally protected. A distinction is made between active and passive systems: Passive isolation systems such as explosion isolation flap valves make use of the overpressure of the explosion for their operating principle: Passive explosion isolation - this is how it works Passive explosion isolation systems respond purely mechanically to the propagation of pressure through its constructive design. Under normal operation, an explosion valve in a pipeline is kept open by the available process flow. When an explosion occurs, the valve is closed by the arriving pressure front, thus effectively preventing the pressure and the flames from propagating any further. One function, different requirements Even if the function of an explosion isolation flap valve is size-independent, the requirements for a wide variety of processes and industries vary greatly. While in the pharmaceutical and chemical industries in particular explosion isolation flap valves are typically only installed in nominal pipe sizes up to DN 400, especially on decentralised aspiration systems of the food industry, for example, larger nominal pipe sizes between DN 450 and DN 710 for central dust extractors can quickly become necessary. In the grain, wood and heavy industry, nominal pipe sizes from DN 800 to DN 1250 are mainly applied. Optimum fulfilment of requirements instead of one-for-all The standard EN 16447 defines the general and especially explosion protection related requirements for isolation flap valves. Furthermore there are industry, process and customer specific requirements that need to be complied by the different types and sizes of flap valves. Obviously, however, an explosion isolation flap valve DN 250 used in the chemical industry must meet different requirements than its DN 1250 counterpart installed in a grain or wood processing plant. While the first application above requires special requirements in terms of accessibility, explosion resistance and material-selection the operators of grain mills or particleboard plants with their characteristic large pipe diameters want protective devices that are as easy to handle as possible despite of their size. The Q-Flap RX explosion isolation flap valve, a joint development of the explosion safety specialists REMBE ® (Germany) and RICO (Switzerland), offers three different design versions. Developed Explosion isolation flap valve Q-Flap RX on the basis of many decades of experience the two companies have accrued with regard to the different customer requirements, the nominal pipe sizes from DN 140 to DN 710 feature an inspection flap, the largest nominal pipe sizes (up to DN 1250), on the other hand, have a modular design so that maintenance and servicing can be carried out easily and thoroughly. Through the swing ´n slide closing principle integrated into the nominal pipe sizes up to DN 710, the valve blade not only rotates into the closed position, but also slides horizontally into the closed position at the same time. This ensures an even more reliable sealing of the entire cross-section. In addition to the features mentioned above, the Q-Flap RX enables high K St values, flexible installation distances and maximum strengths. www.rembe.de REMBE ® is mostly associated with REMBE ® GmbH Safety + Control - the specialists for explosion safety and pressure relief worldwide. The company offers customers cross-industry safety concepts for systems and equipment. All products are manufactured in Germany and meet the demands of national and international regulations. The customers who purchase REMBE ® products are among the market leaders of various industries, including the food, chemical, pharmaceutical oil and gas as well as wood industries. The technical engineering expertise is based on more than 45 years of application and project experience. As an independent, owner-managed family company, REMBE ® combines expertise with highest degree of quality, and is also actively engaged in various professional bodies worldwide. Short alignment routes enable the achievement of quick responses and customer-specific solutions for any kind of application: from standard pro-ducts, all the way up to high-tech special designs. 16 No. 1 • March 2021

TOOLS The topic of finishes and decors is on the move as never before in the furniture industry, in shop fitting or in interior design. Digital and direct prints on ultra-thin decors, fine haptics, matt and high-gloss looks, nanotechnologies, antifingerprint materials or combinations of plastic and wood derived material dominate the material trends. However, as fine as the material finishes are, the true art of perfection can only be seen in the quality and appearance of the final edges. This presents many users with difficulties, especially when sizing and grooving on CNC machining centres. After all, the perfect edge has to be produced without bringing the cost-benefit ratio into an unbalanced position. The solution: diamondtipped shank cutters from the Diamaster EdgeExpert series from Leitz. No more tear-out edges and badly cut middle layers when CNC-sizing Tear-outs on both sides of the edges, unclean cut finishes and lots of time-consuming reworking ‐ this scenario alone makes many CNC users break out in a sweat. And when the tools start to fail excessively, good advice is often needed. This is not the case with the Diamaster EdgeExpert shank cutters from Leitz. Perfect edges, absolutely flawless middle layers and up to 30 percent longer tool life become reality. This is a fantastic savings potential compared to conventional solutions ‐ with relatively low purchase costs and particularly low service costs. The main attraction here is the special, spiralshaped arrangement of the cutting edges. With alternating cutting angles between 45 and 54 degrees, they always machine the material at the perfect working angle. Lower cutting angles used in conventional cutting tools allow cleanly cut middle layers, however, the edges break out much more frequently. The opposite is the case with cutting angles that are set too high. In this case, the edge quality increases, but the vibrations that occur on the workpiece prevent the perfect cut of the base material. Defective middle layers are the result. The CNC shank cutters of the EdgeExpert series from Leitz are available from stock in three different performance categories. The Diamaster PRO EdgeExpert, for example, is available as a Z1+1 version in two working lengths, each with a diameter of 16 mm. As a starter model, it is perfectly suited for small and medium batch sizes and can be resharpened up to four times. The Diamaster QUATTRO EdgeExpert is the all-rounder for medium to large batch sizes. The Z2+2 version with a diameter of 20 mm allows much higher feed rates and thus shorter machining times. It can be resharpened up to six times and thus provides a perfect cost-benefit ratio in its category. For very large batch sizes and extremely high feed rates, the Diamaster PLUS3 EdgeExpert is the perfect choice. Available with a diameter of 25 mm, in various cutting lengths, it is the perfect solution when perfect cutting quality is required, such as on machining centres with zero-joint edging technology. This Z3+3 cutter makes this possible primarily due to the Real-Z3 technology developed by Leitz and can be resharpened up to eight times. The diamond-tipped shank cutters of the EdgeExpert series are suitable for use in all types of chip and fibre materials. No matter if it is raw, plastic-coated or with sensitive decorative papers, foils or veneers. Even laminated woods such as plywood or multiplex with delicate finishes can be machined perfectly and highly economically with the EdgeExpert shank cutters. Another advantage is the optimal chip removal, which results in significantly less wear on the cutting edges. Even more advantages and time savings are achieved by users who order their Leitz tools as a complete system in combination with a high-performance shrink fit chuck. Perfectly assembled, balanced and including the supplied setting data, these tool systems are ready for use immediately after delivery ‐ as a new tool ex works or also after sharpening in manufacturer quality, in one of the more than 120 Leitz sharpening services around the globe. All in all, these solutions in new dimensions show why Leitz simply offers more. Knowledge and reliability for more quality, efficiency, productivity and flexibility and thus for more success of the users of Leitz products. www.leitz.org No. 1 • March 2021 17

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