Regarding formaldehyde, everyone is no stranger to it. As one of the killers of home health, many people even 'talk about aldehyde discoloration' when they hear the word 'formaldehyde'. As a result, more furniture
manufacturers claim that their furniture is 'zero formaldehyde' in order to cater to the needs of the public. Of course, because the wood itself contains a small amount of formaldehyde, plus the use of adhesives and other substances in the wood processing, it is basically just a legend that the furniture must be truly zero formaldehyde. So, someone asked, in addition to the trace formaldehyde that comes with wood, where will other formaldehyde be hidden in the furniture? Today, we will take everyone to take a look at the source of formaldehyde pollution in solid wood painted furniture, panel furniture and other types of furniture. Sources of formaldehyde pollution in solid wood painted furniture: solid wood painted furniture frames are solid wood, in most cases the cabinet door panels are also solid wood, but the side panels, partitions, and back panels are mostly wood-based panels such as finger-joined panels, blockboards, and plywood. Therefore, the formaldehyde pollution source of painted furniture comes from two parts: first, the wood-based panel without painting; second, the amount of paint sprayed inside the furniture is small, the paint film is incomplete, and the release of free formaldehyde in wood-based panels cannot be completely sealed, which is also a long-term pollution source. There is no long-term formaldehyde emission from the exterior surface of painted furniture. The painting process of painting the outer surface (outside) of the furniture is: spray painting-sanding-then spray painting. Polishing makes the paint surface smooth and smooth, and ensures the integrity of the paint film sprayed here; while repeated spraying and multi-layer coverage increase the thickness of the paint film. The completeness of the paint film and multi-layer coverage can completely seal the man-made board and isolate the release of free formaldehyde. Therefore, the free formaldehyde in the wood-based panel cannot be released from the outer surface of the painted furniture. Only a small amount of free formaldehyde released in the paint binder for a short period of time will generally be completely released within 6 months. The interior of most painted furniture is also a source of long-term formaldehyde pollution, but the inner surface (inside) of the furniture has a small amount of paint and is rarely polished. The inner surface does not seem to have the luster of the outer surface, and it feels slightly rough to the touch, indicating that the paint film is incomplete, does not have a full sealing effect, and cannot completely seal the release of formaldehyde in the wood-based panel. The free formaldehyde in the wood-based panel is fine from the paint film. Volatilize from the damaged area, causing pollution. Therefore, when you open the door of a furniture cabinet, you often feel irritation and unpleasant smell, which is caused by the mixture of paint smell and formaldehyde pollution. The unpainted plain board has the heaviest pollution. The unpainted wood-based panel components are the most formaldehyde emission part of the painted furniture. Unpainted parts are often in places that are not easily detectable, such as the outside of the drawer board, the inside of the drawer box, the outside of the furniture back panel, the inside of the bed box, the inside of the sofa, especially the inside of the furniture made by decoration. The most common man-made board element. Painted furniture, the outside of the drawer floor, the inside of the drawer box, the outside of the back panel, the outside of the top plate, the outside of the bottom plate, the inside of the bed box, and the outside of the bed box bottom are the most common sources of long-term formaldehyde pollution. Some sources of pollution are listed in the figure below for reference only. The most common formaldehyde pollution source of panel furniture is 'customized overall wardrobe'. Customized overall wardrobe is a typical melamine decorative panel home. Other common melamine home furnishings include finished wardrobes, bookcases, beds, desks, dining tables, cabinets, and computers. Tables, desks, etc. Panel furniture structure: More than 90% of panel furniture is made of melamine board. The melamine board is made of particleboard (some of which is medium density fiberboard) as the base material, and the surface is pasted with melamine veneer, and the side is the furniture with PVC edge banding. Therefore, the long-term formaldehyde pollution emission source of melamine furniture is the particleboard that acts as the base material. 'Particle board' is made by mixing urea-formaldehyde resin and water chips. It is a kind of man-made board with a large amount of formaldehyde. It is seldom used directly. ') and then used indoors, so although the particleboard is a long-term formaldehyde pollution is the home, but if the quality of the lamination material is qualified and the edges are tight, the free formaldehyde in the particleboard can basically be enclosed in the board. Therefore, there are several sources of formaldehyde pollution in panel furniture: first, there is no plain veneer veneer, which is common on the outside of the drawer bottom, the outside of the furniture backboard, the outside of the bottom, etc.; second, there is no edge sealing, which is common in the home In the partition; the third lamination quality is unqualified, or the edge banding is unqualified. These three conditions will cause the free formaldehyde in the substrate to volatilize into the air and form pollution. The formaldehyde in panel furniture mainly comes from three places: particleboard and density board without leather veneer, or the side without edge sealing. There is no veneer, and it is most common on the outside (back) of the drawer bottom panel, the outside of the back panel, and others such as the outside of the cabinet bottom panel, the back panel inside some furniture, etc. (as shown in the 'exposed plain panel' in the figure below); There is no edge sealing, which is usually found on the inner side of the drawer side board and the lining board on the underside of the cabinet (shown as the 'exposed cut surface' in the figure below). In addition, some of the workmanship is rough, or the melamine veneer uses inferior materials, which cannot completely seal off the release of free formaldehyde from the particleboard, thus forming a long-term source of formaldehyde pollution, as shown in the above picture marked 'unqualified skin'.
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