Some fir pile processing companies have troubles because the defective fir piles cannot be used. Some manufacturers even sell the defective fir piles as scrap fir piles. In fact, the use value of the defective fir piles is still very high. Any kind of fir pile defects are harmful to the fir wood. The grade of the pile product has a certain impact, causing the fir pile to lose its original value. The economic yield of the fir pile is affected during processing. However, rational use can greatly reduce the negative impact caused by the defects of the fir pile, and sometimes it can also improve the quality of the fir pile. Use and economic value of piles.

(1) Setsuko

1. The definition and classification of knots.

(1) Definition: During the growth of trees, the bases of living branches or dead branches hidden inside the trunk or main branches are called knots.

(2) Classification: The shape, raw materials and distribution of knots are diverse. Due to different classification characteristics, there are many classification methods. Therefore, the same knot can have several types according to different classification methods. A name. According to the joint state of the knots and the surrounding fir wood piles, they can be divided into living knots and dead knots. According to the raw materials of the knots, they can be divided into sound knots, old knots and leaky knots. According to the cross-sectional shape of the knots, they can be divided into There are three types of nodes: round nodes (including oval nodes), strip nodes and palmate nodes. According to the distribution of nodes on the trunk, they can be divided into scattered nodes, group nodes, whorled nodes and forked nodes.

2. The influence of knots on processing and use. It is a normal phenomenon for fir wood piles to have knots. Except for pit wood, electric poles, pile wood, etc., which directly use logs, other wood types are regarded as a disadvantage. Moreover, knots Knots are one of the important factors in identifying the grade of fir piles. According to statistics, 70%-90% of the grading of fir piles is determined by knots. It can be seen that knots have a great influence on the raw materials.

The influence of knots on the quality of fir piles mainly depends on the type, size, density, distribution and use of fir piles. Generally speaking, live knots have little impact, followed by dead knots, and missing knots have a greater impact. Round knots have a greater impact on the quality of fir piles. Small, strip-like segments and palmate segments have greater influence.