The way of formaldehyde emission
1） 木材本身在温度
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和湿度作用下散发极微量甲醛。1) Wood itself emits very little formaldehyde under the action of temperature and humidity.
2） 脲醛树脂在制胶过程中不可避免地残留一部分游离甲醛向外散发。
2) In the process of making glue, part of free formaldehyde will inevitably remain in UF resin.
3） 人造板在固化过程中，一部分线性树脂未形成网状结构从而分解成自由状甲醛向外界散发。
3) During the curing process of wood-based panel, a part of linear resin does not form a network structure, which decomposes into free formaldehyde and emits to the outside.
4） 部分固化不完全的树脂在热和水分的作用下发生分解而形成游离甲醛向外散发。
4) The partially cured resin decomposes under the action of heat and moisture to form free formaldehyde.
日本的研究表明，室内甲醛的释放期一般为３至１５年。
Research in Japan shows that the release period of indoor formaldehyde is generally 3 to 15 years.
