Cork is a renewable but limited material available, is derived from the bark of the cork oak, which grows in the Mediterranean (Spain, Portugal, central and southern Italy, Africa North-western Turkey).
May be taken from the plant until about 20 years of age, and the product obtained from this first Decorte is called "sugherone" or "cork male ". From the second you get Decorte, however, the "cork gentle" or "cork female, finest, smooth, compact and elastic.
With the first type is produced granulated cork used in construction in bulk at agglomerated panels. Cork is made up of millions of polyhedral shaped cells containing air, a structure that gives the material lightness, elasticity, resistance to physical stress, excellent thermal and sound insulation, heat storage capacity and thus damping thermal fluctuations, is breathable and permeable vapor resistant to acid agents, inappetibile to insects, rot also under conditions of high humidity.
In case of fire does not propagate the flame but it burns slowly and turns itself off at the stop of the flame.
The loose granular cork is used in wall cavities or, if mixed with water and hydraulic binder vitrification, such as dough for the creation of viable isolated foundations, ceilings, attics, floors and subfloors.
barks arising from the first Decorte are stacked in the collection centers for at least two years, after which they are immersed in boiling water for 1-2 hours, then left to dry for several days. The granules are obtained by grinding and polishing in special mills from wood waste, are then examined with special grills to get different grain sizes. The result is a blonde granules (80-120 kg/m3), depending on the type of work you will get different types of panels:
1. panel of agglomerated cork autocollato brown foam, obtained by cooking the grains in an autoclave at about 350-380 °, the process by which suberin contained in the granules melt welding the individual granules, of course, the granules swell easing the product and producing phenol, then you get tablets or blocks which are then cooled and cut into slabs of different thickness.
2. cork panels of compressed natural blond color, high density (200-500 kg/m3) obtained by adding to the granules of synthetic glue, the mixture is then rolled or peeled with knives mechanics.
Cork is reusable, recyclable and compostable (decomposes in the soil or composting sites). For many uses the recycled cork has the same performance as the virgin cork.
energy consumption in production: 30-60 kWh/m3, plus another 30 for the expansion of the panels.
Finally, the thought that the panels produced with this material are expensive is due to a lack of information, try asking price and put them in comparison with other insulation materials, you'll see the same effect on the cost of the cork will be smaller, let me know.
ops forgot ........ ..... help me paint the world green. Green + + +
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