Air humidification in wood industry
The awareness of the significance of humidity in furniture, wood and lacquering industries among the proffessionals is constantly rising. The increasing competition on the market makes it necessary to optimize every step of the process to acheive the best possible product at the lowest cost. The humidification is one of such means. The change that systems manufactured by Sternal International company carry, are especially appreciated on the lines of polyurethane foams (it minimizes the risk of ignition), lacquering, drying, gluing (particularry when solid wood and plywood elements are processed), natural as well as interlining veneer application, lamination, cooling down chipboards coming out of the press, semi-finished product storerooms (leathers, turned wood elements etc.), floor panel manufacturing (reduction of dust in the air, electrostatic charge).
The manufacturers of industrial adhesives give precise guidelines as for the conditions that the process involving their products should be conducted in. For most of the products, the recommended temperature while applying the glue and curing should be between 18 and 20°C, the humidity of wood between 8 and 10% and the humidity of air between 60 and 70%. The proper humidity while lacquering not only improves safety, but also helps to acheive good quality coating. The temperature and humidity in the room should remain constant throughout the duration of the process. While lacquering, the room temperature should be between +5 and +25ºC at the processed surface temperature up to 40ºC. When the substrate is a metal, its temperature should be at least 3 ºC higher than the point of condensation of the surrounding air to avoid condensation. The best results are acheived when the relative humity does not exceed 85% -exceeding this value may promote condensation and will increase the drying time of the coating.
One of the main problems in the wood processing industry is the wood dust, that is unavoidable when it is mechanically machined. Most dust is generated by grinders, saws and lathes. It is worth knowing, that the airborne dust from hardwood (oak and beech) is cancerogenic, while some other wood spieces may be toxic in other ways when inhaled in form of small particles.
The air humidification lowers the concentration of dust in the working areas and reduces the number of intervals during the work day. The reduction of this phenomenon will result not only in the improvement of well-being of workers in short and overall health in long term, but also reduces the risk of fire or explosion. The biggest disasters that happened in Poland in recent years- in EUROPOL-MEBLE company in Chodzież or Zakład Stolarski “PIĘTRUS” with a big degree of probability may have been avoided if proper humidification was used.
Our systems are optimised in such a way, so that a part of the atomised water evaporates and displaces the oxygen from the protected area. This effect can be compared to the feeling of heaviness of the air in hot, humid days. At the same time the water fog reduces the electrostatic charge, preventing from discharges. The air saturated with water fog effectively protects against the explosion. The extent water sticks to dust particles and by the force of gravity, drops on the floor. The greater the disperse of water the more intensive is the proess of joining of water droplets and smaller dust particles.