Identification of pine nutrients

Character identification

1, Pinus tabulaeformis

It is oblate or segmental or irregular in shape or length and varies in length and thickness. The surface is yellow-brown, gray-brown or reddish-brown, slightly rough, sometimes with brown to dark brown oil spots, or with residual cork. Hard and heavy. Cross section a light brown wood, heartwood slightly darker color, showing a pattern of concentric rings, sometimes brown scattered like resin passage orifice, substantially oil; pith small, yellowish brown, straight or oblique texture profile, non-uniform. Turpentine aroma, slightly bitter taste.

2. Masson Pine

Similar to Chinese pine. The surface is yellow-brown, light yellow-brown or reddish-brown, and the longitudinal section is straight or oblique and more uniform. The body size, color red brown, oily feet are better.

Microscopic identification

1, Pinus tabulaeformis

Cross-section annual ring width 0.4-0.5mm. The tracheid diameter was 20-40 μm for early wood, and the wall thickness was 1.7 μm. The tracheid diameter was 9-27 μm and the wall thickness was about 3.5 μm. The diameter of the resin channel is 60-146 μm. The cross-section of the radial cross-section pits is 1-3, more than one, and the inner wall of the wooden ray tracheid is sharply serrated. The tangential ray is 1-13 cells taller.

2. Masson Pine

Cross section annual ring width 1.5-6mm. The tracheid cell diameter is 30-95μm and the wall thickness is about 3μm. The tracheid diameter is 15-36m and the wall thickness is about 7μm. The diameter of the resin channel is up to 200 μm. The cross-section of the radial cross-section is a hole-shaped pane, a thin pine type, and more than 1-2, and the inner wall of the ray tracheid is more blunt. Cut tangential ray cells 1-24.

Dry aging

Dry and stable period

After logging usually 5 - 30 years, such as sawn timber ventilated drying rate slightly faster under good environment, poor ventilation and if not sawn pine knot contained in the wood drying is very slow. At this stage, the pine knots are generally cut and scented. The color is usually golden, reddish, etc. The material has a larger proportion, and the material is harder and firmer, and the material yield is higher.

Aging, initial and mid carbonization

After logging is generally 30 - 100 years, the pine knot this stage the partially under the influence of biological enzymes and microorganisms Laid air wood fiber tapers decomposition carbonization, part of oil and volatile matter in decomposition gradually volatilize. At this stage, the pine knots are usually odor-rich, fermented, acid and aroma. The color gradually darkens, and the color gradually darkens. The specific gravity of the material gradually becomes smaller, and the material properties gradually become crispy. The pores in the material gradually increase and the fat crystal gradually increases. Obviously, the overall material of this type of pine knot is cracked and rotted, and the output rate is very low.

Late aging (carbonization)

Generally about 100-300 years after logging, the moisture content in the pine knot is very low at this stage. The fat crystal is very good. The wood fiber is very low in carbonization due to dry shrinkage, and the material is very crisp and hard, and the material is more dense. At this stage, cutting the pine knots is generally a strong smell of volatile pine odor. Some of them have a spicy eye that rushes out of the nose. At this time, they “saw a festival and filled the room with pine scent”. This type of rosacea, rot, rot, scorpion, etc. are very numerous, and the rate of export is extremely low.

Decay period

For the decline of pine knots, pine knots are highly decomposed by carbonization, and finally become a residue of wood flour.

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