Advance log furniture tells you what is "white skin"?

Many people don't pay attention when buying mahogany furniture. When they buy it back, they will lose small wood chips and even bugs. It is very likely that they have bought furniture with " white skin ". Today, the logs are telling you what is "white skin"?

前进原木

First, what is "white skin"

"White skin" is a common name, and the norm is called "sapwood." “Sapwood” is relative to “heartwood”. The sapwood, that is, the part of the bark outside the heartwood of the tree, the sapwood and the heartwood of the tree, generally have obvious differences. Taking most of the redwood species as an example, the part of the heartwood is dark, and the color of the sap is obviously shallow, and the heartwood It is quite obvious to distinguish it from sapwood, so it is called "white skin".

The mahogany raw materials are all sapwood, and when the timber merchants sell the wood, many of them are also sold in the form of logs containing heartwood and sapwood.

Second, the wood experts know the sapwood

According to the national standard of mahogany ( GB/T18107-2000 ), “redwood” refers specifically to the heartwood part of wood, and the sapwood part does not belong to mahogany.

Why do you have to make such a regulation? According to the timber expert, “Sapwood refers to the wood part of the living tree, which has living cells and storage materials; the outer part of the cross-section of the trunk; usually light color; with sap, mechanical support, storage of nutrients, etc. Function." Generally speaking, the heartwood is "dead wood" and the sapwood is "live wood". This is because the sapwood is the passage for wood to conduct nutrients.

After the water and nutrients are absorbed by the roots, they are transmitted to the branches and leaves through the sapwood portion, and then photosynthesis is carried out to grow the plants. We know that if the bark is smashed down, the trees will die, because it blocks the waterway. The effect of sapwood is similar to this. Because the sapwood plays the role of conducting nutrients, this part of the wood is relatively loose and nutritious, so it is also the "food storage room" of the parasite. Therefore, it is easy to attract insects, and the density and other indicators are not as good as the heartwood. It can also be regarded as "redwood", which will greatly reduce the quality of mahogany.

In this sense, sapwood was not included in the category of redwood. This is good for the use, processing and distribution of rosewood in the market and regulating the market. The original motive of the introduction of the "Redwood" national standard was to regulate the market.

There is such a case: a customer bought an Arhat bed. After a while, he found that small wood chips appeared under the bed. After cleaning up, it appeared again in a few days. Turning it over, it turned out that the bed was infected with insects. “Isn’t that mahogany not being wormed?” The customer was very suspicious and consulted an expert. Experts explained that this is because the sapwood is used, and the sapwood is not treated well, and there are still living insects in it. This is naturally a substandard product.

前进原木

Quality Supervision Bureau cuts and destroys white-skinned mahogany furniture

3. Can mahogany furniture use sapwood?

One said: can not use sapwood

Mahogany furniture is a high-end product, and the quality should be guaranteed. With sapwood, the quality is reduced. In addition, the "Redwood" national standard clearly states that "redwood refers to the heartwood part of the wood." Since the material used for mahogany furniture is "redwood", and mahogany refers to the heartwood, the sapwood does not belong to mahogany, then you use this "redwood" furniture. The sapwood should not be, or even violate the "standard".

Another said: you can use sapwood

Even try to use sapwood as much as possible, on the grounds that “redwood is a scarce resource and should do its best to make the best use of it. This is also called environmental protection, called low carbon.” Many wood and forestry workers support this view. What's more, "When we buy wood, the sapwood is also the same." Some industry bosses say this.

In fact, the second two said that there are certain limitations. Accurately, sapwood can be used on mahogany furniture, but it can be used conditionally, based on the industry standard, the standard for dark and expensive hardwood furniture ( QB/T2385-2008 ).

The standard said: "The material of the front side of the product should be free of sapwood; the sapwood area of ​​the surface of other parts should not exceed 1/10 of the surface area of ​​the part (the sapwood with a width less than 8mm is not counted)." Wood should be insecticidal and repaired, and wood that is still eroded by live insects should not be used." Because "Dark and expensive hardwood" listed in the "Dark and expensive hardwood furniture" standard includes 33 kinds of wood in the "Redwood" national standard , mahogany furniture can also be called dark and expensive hardwood furniture, so mahogany furniture can be used. Sapwood, but must be strictly limited to the standard range.

The National Furniture and Indoor Environmental Quality Supervision and Inspection Center's opinion is: If there is a consumer to bring the test, we will ask the person to detect what. If you come to the person to test the furniture material, then the "Redwood" standard is applied; if the quality of the furniture is tested, then the "Dark and expensive hardwood furniture" standard is applied to see what the consumer demands.

More furniture information, all in the " GO Jiaju Network "!

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