Fir fingerboard E1 and below. The environmental protection status is not good, and the environmental indicators still do not reach E0. (There is a clear contradiction with the previous paragraph.) The finger joints of the fir are poorly wooded and cannot be deep-dried (because of deep drying, the strength will drop sharply and thus cannot be used). The water content is high and the adhesion to the glue is very high. That is, it is necessary to use a glue with a high formaldehyde content. The fir is sawn into small pieces; then it is deep-dried; the small pieces are then opened, and then the glued parts (formaldehyde-rich) are applied to the teeth and small pieces, and then fixed by extrusion.
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