The harm of inferior board is mainly due to the excessive of various harmful substances, especially formaldehyde. ?
For formaldehyde, the majority of consumers are not unfamiliar, many people are talking about formaldehyde color change. Formaldehyde is a highly toxic substance, which is also known as the first killer of indoor environment.
According to scientific research, when the concentration of formaldehyde in the air reaches 0.06 ~ 0.07 mg / m3, it will cause slight asthma; When the concentration reaches 0.6mg/m3, it will cause throat discomfort, pain, nausea, vomiting, cough and even pulmonary edema; When the concentration reaches 30mg / m3, it will cause death.
Of course, there are other harmful substances in inferior board, which are very harmful to human body, such as benzene, radon, ammonia, etc. These substances make the harm of inferior board no less than poison.
What kind of board is high quality board?
There are many kinds of plates, and various standards are also different. ?
But as a variety of different types of plates, they can be qualified or high-quality standard is that the harmful substance content of the board conforms to the national standard, and the material used in the plate is excellent. ? And these for consumers, we may not be able to directly identify, but if the plate brand can pass the certification of some national and even world authorities, then this is an important affirmation of the quality of plate, and also let consumers feel at ease about the quality of plate.
How to judge the quality of the board?
£¨1£© Check whether there are obvious defects on the surface of the board. The decorative board surface should be smooth and clean, without burr, slicing knife mark, glue penetration and board surface pollution (such as local blackening and yellowing). If there are no cracks, cracks, knots, leather, resin bag and tree glue, the natural warpage of the whole board should be as small as possible to avoid improper sanding process, The sand penetration phenomenon revealed by the substrate. ?
£¨2£© Recognize the difference between veneer veneer and natural veneer veneer. The texture of veneer is straight and regular; The latter plate is natural wood pattern, and the texture pattern has large natural variability and is irregular. ?
£¨3£© Board appearance inspection decorative board appearance should have a good aesthetic feeling, the material should be fine and uniform, the color is clear, and the wood grain is beautiful. The texture of board and parquet should be arranged according to certain rules, the wood color is similar, and the seam is nearly parallel to the edge of the board. ?
£¨4£© The structure of the adhesive layer of the board is stable, and there is no opening phenomenon. It should be noted that there should be no bulge and delamination between the veneer and the substrate on the surface of the plate and between the layers inside the substrate. ?
£¨5£© In the GB / t5849-2006 standard of woodworking board, formaldehyde emission: E0 level ¡Ü 0.5 mg / L. In the standard of F4 star in Japan, the average value of formaldehyde emission is less than 0.3 mg / L, and the maximum value is 0.4 mg / L.