Various types of raw wood count measurement

Abstract: With the increase of the number of imported logs and the change of sources in China, the detection methods of logs are also diversified. Therefore, it is a realistic and important subject to master the correct measurement and calculation methods of raw timber. The various types of raw wood product counts described in this paper are mainly applicable to Mozambique and are used in Chinese and English for reference by various businesses.

Since the implementation of the “Tianbao” project in China in 1998, the imported timber has increased year by year, and the trend is shown in the table below. On the one hand, it is China's determination to have a broad market for imported timber. On the other hand, with China's accession to the WTO, zero tariffs on imported logs have spurred the import of logs. Wood from all over the world gathers in China, and China has become a distribution center for the world timber market. The source of imported timber has expanded from a few countries to countries and regions in Africa, Southeast Asia, Oceania, South America and Europe.

The expansion of the source and the increase in the number have brought vitality to the timber market in China. At the same time, due to the different testing methods adopted by various countries and regions, it has also brought many inconveniences to our businesses. In particular, the detection and calculation of some coffins and descending materials make it difficult to start. Mozambique materials introduced in this paper, China's annual import volume is 50,000-70,000 m3, its wood quality is particularly excellent, it is the superior material for manufacturing furniture and craft carving, but its wood has small diameter, many defects and high price (CIF price) Usually about 400USD). In order to do a good job in Mozambique's timber trade and save foreign exchange, based on the trade experience and practice in the past few years, the author provides various types of raw wood product count measurement methods for Mozambique wood characteristics.

1 diameter calculation method

1.1 Measuring diameter is 1 cm minimum base, less than 1 cm.

1.2 The decimal point of the head end (A+B)÷2 or the tail end (C+D)÷2 is not counted.

For example: head end (36 + 37) ÷ 2 = 36.5 meter 36CM tail end (30 + 31) ÷ 2 = 30.5 meter 30CM

Diameter work = [(A + B) ÷ 2+ (C + D) ÷ 2)] ÷ 2

(1)Measure the diameter (For place of origin check to use)

(A) Measure the diameter then 1 cm is minimum cardinal number, Lack 1 the cm does not compute the size.

(B) The head carries (A+B)÷2 or end tips(C+D)÷2 decimal point does not count.

For example:

Head carries(36+37)÷2=36.5 is 36cm

End tips(30+31)÷2=30.5 is 30cm

D=[(A+B)÷2+(C+D)÷2)]÷2

2 Length calculation method: (original inspection)

Measuring length is 10 cm minimum base, less than 10 cm

For example: 3.18M meter 3.1M

(2)Measure the length: (For place of origin check to use)

Measure the length then 10cm is minimum cardinal number, Lack 10 the cm does not computer is size

For example: 3.18M is 3.1M

3 Calculation methods for various types of logs: (for commercial transactions)

Note: The following applies to the inspection of other applicable origins except for the D and diameter formulas.

3.1 standard logs

D=(A+B+C+D)÷4

M3=D×D×L÷10000×0.7854

Standard(Normal) Log Wood

D=(A+B+C+D)÷4

M3=D×D×L÷10000×0.7854

3.2 horn type logs

D = middle end circumference ÷ Л - 1 white edge size

Style Like Bell

D=(Middle circumference)÷ Л -Half under sap size

3.3 groove type logs

D=(At the bottom of the A+B trough +C+D trough bottom)÷4

Style Have Fume

D=(A+B Fiume bottom+C+D Fiume bottom)÷4

3.4 irregular logs

D=(A head diameter + B end diameter) ÷ 2

Style under standard long wood:(Flaw timbet)

Another because the tree species reason does not be include in the

D=(A up diameter +B down diameter)÷2

3.5 end splitting logs

The length of the end crack of the ç‘•ç–µ and down material is more than 25% of the total length.

D = middle end circumference ÷ Л - 1 white edge size

M3=D×D×(L-L1)÷10000×0.7854

Style chapped long wood:(Flaw timbet) While eaprying the fison length exceed the total longth of 25% not accept

D=Central circumference÷ Л-Half under sap

M3=D×D×(L-L1)÷10000×0.7854

3.6 double water heart type logs: "ç‘•ç–µ and descending materials"

D=(A+B from a water core point over b water core point +C+D from c water core point over d water core point)÷4

Style two core long wood:(Flaw timber)

D=(A+Bfrom a core pass b core+C+D From c core pass d core)÷4

3.7 rot or dead heart logs (all rot)

"瑕疵和降等材" rot area is more than 30% of the diameter does not accept

D=[(A+B+C+D)÷4]-[(a+1cm)+(bd1cm)+(c+1cm)+(d+1cm)]÷4

Style cariosoty wood or pfrish wood

(Flaw timber) The timber area of ​​the putrefied core exceeds the diameter of 30% above not accept

D=[(A+B+C+D)÷4]-[(a+1cm)+(bd1cm)+(c+1cm)+(d+1cm)]÷4

3.8 rot or dead heart type logs (one end rot)

"瑕疵和降等材" rot area is more than 30% of the diameter does not accept

D=[(A+B+C+C)÷4]-[(a+1cm)+(b+1cm)]÷2

Style cariosoty wood (or pfrish wood)

(Flaw timber) The timber area of ​​the putrefied core exceeds the diameter of 30% above not accept

D=[(A+B+C+C)÷4]-[(a+1cm)+(b+1cm)]÷2

3.9 live knot type logs

"瑕疵和降等材" thrift more than one does not accept

M3=D×D×(L-L1 thrift width is long)÷10000×0.7854

Style have fresh scar log wood:

Flaw timber the scar exceeds more than one not accept

M3=D×D×(L-L1 Scar long)÷10000×0.7854

3.10 dead knot type logs

"瑕疵和降等材" thrift more than one does not accept

M3=D×D×(L-L1)÷10000×0.7854

Style have old scar long wood:

Flaw timber the scar exceeds more than one not accept

M3=D×D×(L-L1 Scar long)÷10000×0.7854

3.11 rotted logs

"瑕疵和降等材" rot edge into the core material is not accepted

D=[(A+B+C+D)÷4]-3cm

Style cariosity side log wood:

(Flaw timber)The timber of the putrefied side is deep into the core does not accept

D=[(A+B+C+D)÷4]-3cm

3.12 Bending Logs: “瑕疵和降等材”

5cm within 5cm, M10 buckle 15% 10-15, M3 buckle 30% over 15cm not accepted

Style bent log wood:(Flaw timber)

Standard for 3M in side 5cm no deduct 5cm-10cm M3deduct 15% 10cm-15cm deduct 30% after 15cm not accept

3.13 black wood

New chopping material (within 3 months) deducted 10%, deducted 7% for more than 3 months

Black wood:

Fresh cut in 3 month deduct 10%

Old cut after 3month deduct 7%

Note: The above coffins include a length of 2.5M or less, and cannot exceed 10% of the total quantity.

PS:The above timber includes the length 2.5M below, but can"t exceed the total amount of 10%

The above illustration is Mozambique's method of sending a white border.

The example of above is Mozambique half under sap measurement, the other not changeses.

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