Heilbronn sorting

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The Heilbronner sorting is a system for classifying raw wood in the timber trade. The system was developed in southwest Germany and got its name after the city of Heilbronn , where the timber rafting was once of great importance and where there was a large timber handling point.

The Heilbronn sorting also requires certain top diameters for certain trunk lengths . The higher the class, the stronger and at the same time longer the trunk has to be.

The individual classes of the Heilbronn sorting are:

Long wood grades Heilbronn sorting
class Minimum length Minimum braid diameter Measurement number
H 1 8 m 10 centimeters 29
H 2 10 m 12 cm 32
H 3 14 m 14 cm 36
H 4 16 m 17 cm 40
H 5 18 m 22 cm 46
H 6 18 m 30 cm 50

Practical background

For the production of timber z. B. A beam of certain dimensions, a trunk with a corresponding length and diameter is necessary at the weaker end of this length. Thus, a sawmill can order wood of the appropriate class in order to be able to produce the desired dimensions from the wood.

Significance for the value of standing wood

The key figures of the Heilbronn sorting show that, according to this system, a tall, slim tree population is rated better than a tree population with compact, but strong trunks that contain more pure wood mass per trunk for the same length. From the timber buyer's point of view, this was entirely justified, because after all , the harvest of woody trees is lower.

literature

  • Martin Behringer: Estimation of standing spruce with simple means with special consideration of the so-called Heilbronn sorting. Julius Springer, Berlin 1900 (digitized volume 1 , volume 2 )

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