Dry season with everyone understand floor shrinkage coefficient and crannies

Solid wood flooring produced in the course of the gap is mainly due to a dry environment , timber produce shrinkage caused by the size of the gap between the floor and the floor of the timber shrinkage coefficient , floor moisture content , the use of environmental equilibrium moisture content and flooring width closely related. Solid wood flooring in the national standard (GB/T15036-2001) specified moisture content of hand scraped laminate flooring from 7% to the local equilibrium moisture content , that factory production floor moisture content that they meet the above requirements , that the product moisture content is qualified, If we do not consider other factors , there may also be a problem. In order to reduce and eliminate the floor in the installation and use of the existing problems , the state issued a " wooden floor coverings , acceptance and use of norms GB/T20238-2006", Standard on September 15, 2006 the formal implementation . The standard process of drafting a large collection of floors complaints related information , in the fully listen to opinions from all flooring display rack sides developed on the basis of the relevant provisions , taking into account the various aspects ( products, production and distribution businesses and consumers ) interests. Specified in the standard for consumer use environment relative humidity is 40% to 80%. Proper use of the warranty period under the conditions of solid wood flooring gap should be less than or equal to 2mm. Based on the above arguments we explore the width of solid wood flooring , floor shrinkage and shrinkage coefficient resulting from the relationship between the gap . Wood shrinkage coefficient reflects the solid wood flooring moisture content changes in dimensional stability of the important indicators . Wood shrinkage coefficient timber cutting in a different direction with the obvious differences. Strings cut wood shrinkage coefficient greater than pine laminate flooring sawn timber. Changes in moisture content under the same circumstances , the maximum chord cut Shrinkage , if a string is cut and sawn timber mounted adjacent the floor of timber , there may be gaps is not exceeded , when the two standard cut wood floor adjacent strings installation is very likely the gap exceeded. In fact, the two standard chord cut wood flooring is installed adjacent to frequently encountered , then the floor is dry shrinkage gap between the floor . So we put the focus on strings cut wood floor drying shrinkage is greater than 2mm on . Flooring manufacturers in the purchase of flooring blanks , should first understand the expansion and shrinkage sandal laminate flooring of wood properties. Some of them in the book can be found in the associated . Such as commonly used in wood properties in the " Wood Science " basically can be found in our wood shrinkage coefficient based on calculation and prediction floor shrinkage situation in the relevant areas . The vast majority of imported timber can also be found in the relevant books . It should be noted that more accurate data of domestic materials and imported materials because of different origin , the same species of wood differences teach large , recommendations or re- measured data will be more reliable. The greater the shrinkage coefficient of wood , with the moisture content , the greater the deformation . Under the same conditions , the greater the deformation of the wider the floor . Northern China summer ( rainy season ) and winter heating period , floor moisture content range is approximately 5%. Within this context , if the floor has a width of 125mm, flooring wood shrinkage coefficient is 0.33 , pine laminated floor the floor drying shrinkage will be more than 2mm. Elected to use wood shrinkage coefficient greater than 0.45 , the width of 92mm floor dry shrinkage can exceed 2mm. The above analysis is to provide solid wood flooring production and distribution units to send a message , the special climatic conditions in the north , the floor of the excessive shrinkage cracks , floor width of 125mm, cut timber flooring chord shrinkage coefficient of 0.39 , when the winter heating users of the indoor environment temperature 20 ℃, the indoor humidity is 40% , Table 1, we have : the floor of the equilibrium moisture content of 8% . The aqueous floor installation rate of 13 % to 8% moisture content variation of 5%. Shrinkage coefficient according to the floor and the floor of the width of the look-up table 2 , the floor of the drying shrinkage of 2.44mm, in accordance with GB/T20238-2006 requirements, floor than 2mm gap should be repaired. As can be seen from this example , the product is qualified, consumer use of the environment also meet the requirements, the floor of the gap than the standard requirements. The original question is unreasonable or selection of the width of the floor caused by excessive . Also the above conditions , the width of the floor remains unchanged 125mm , if a user's ambient humidity to 55 % at this time , a humidifier can be , flooring equilibrium moisture content of 11% , the moisture content rate of the floor of gloss laminate flooring the installation 13% down to 11% moisture content variation of 2% floor , the floor of the drying shrinkage of 0.98mm, meet GB/T20238-2006 requirements. According to " wooden floor coverings , acceptance and use of norms GB/T20238-2006", consumers use environment relative humidity of 40 % to 80% . It gives the consumers to use environment relative humidity of 40% bottom line , this time environmental characteristics meet the standards. Such conditions are normal use , during the warranty period if the floor of the gap exceeded, warranty conditions , the relevant party shall assume warranty obligations. According to the requirements of the northern winter heating , the room temperature should reach about 20 ℃ , Table 1, the air relative humidity is 40% and the indoor temperature is 20 ℃, the floor of the equilibrium moisture content of 8% , indicating that the moisture content of the northern floor heating period the bottom line is about wood laminate flooring 8%. Moisture content should be capped at the northern region for the local equilibrium moisture content , according to the actual northern summer ( June to September is the rainy season ) flooring equilibrium moisture content of 12% to 13 % or so. Year, the northern regions floor moisture content changes ( max - min ) is about 5 %, if the user is too dry winter humidity ( relative humidity of the indoor air of 30 % or less ) , a year in which floor moisture content range may will be greater. The moisture content changes every year, alternating . So, every winter produce relatively large gap . User environment exceedance aside , the normal range of variation floor moisture content of 5% or so. So we need to look at the floor when the moisture content of 5% reduction of drying shrinkage is more than 2mm. When we install the floor might floor moisture content is not in the region's largest state, but should be based on the actual moisture content of the floor with the regional equilibrium moisture content reasonably determine reserve gap ( issues related to the topics discussed in the future ) , to ensure that wettest season floor is not drum kits, floor strips should not be a gap between , when the moisture content of the floor was still at teak laminate flooring the maximum state. Therefore, we should put the maximum moisture content of the region as a basis to consider