Plain Plywood 5

The rapid growth of the Chinese economy has become a strong pulling force for the demand of the plywood market in Liuzhou, the massive influx of fast-growing and high-yielding timber from north and east China as well as Yangtze Plain areas, and the constant replenishment of high-quality broadleaf timber from abroad, china's plywood industry for the continuous development of the provision of rich raw materials, adequate human resources, but also the development of China's plywood industry cost accounting and other plywood producers have an advantage over the important factor. The Chinese plywood product quality itself, also had the big promotion, in the international market competitive power is more and more strong. China is not only a big plywood exporter, but also a big plywood producer in the world.

From January to December 2006, China's plywood manufacturing industry achieved a cumulative industrial output value of 75,819,437,000 yuan, an increase of 39.83% over the same period in 2005, and a cumulative sales income of 72,163,513,000 yuan, an increase of 39.25% over the same period in 2005 The total accumulated profit reached 3,198,494,000 yuan, an increase of 60.41% over the same period of 2005.

From January to November 2007, China's plywood manufacturing industry achieved a cumulative industrial output value of 101,828,484,000 yuan, an increase of 48.27% over the same period last year, and realized a cumulative sales income of 96,534,099 yuan, an increase of 48.87% over the same period last year The total accumulated profit reached 4,732,364 thousand yuan, an increase of 70.26% over the same period of last year.

Although China's plywood is developing rapidly, it still faces anti-dumping complaints from the European Union and some other importing countries, therefore, China's plywood enterprises and industrial organizations must strengthen communication with importers, strengthen enterprise self-discipline, regulate the order of export operations. With the expansion of China's infrastructure construction and the strengthening of the development of the central and western regions, the market potential of plywood is huge.

DEFECTS IN PLYWOOD:

Knots 7.1.1 knots knots the branches of a tree wrapped in wood.

7.1.1.1 knots PLN knots diameter not exceeding 3mm for sound Easter.

7.1.1.2 Easter intergrown knobs are formed from the treetops. The length of the knot is more than 3 / 4 of the length of the Cross section. The knot is hard and has normal structure.

7.1.1.3 dead knots are formed by dead branches of trees that are attached to the wood around the knot or only a quarter or less of the length of the perimeter of the Cross section. The knot is hard or soft, sometimes falling off and forming cavities.

7.1.1.4 semi-easter partially intergrown knOts knOts are made of wood that is more than 1 / 4 to 3 / 4 The length of the perimeter of the cross-section and is hard in texture.

7.1,1.5 sound knots no rotten knots.

7.1.1.6 imperfect knots unsound knots knots knots no more than 1 / 3 of the knots in the section decayed.

Rotten knots 7.1.1.7 rotten knots more than 1 / 3 of the knots are rotten knots.

7.1.1.8 knot holes.

Abnormal structure a defect, such as a wrinkle, that results from an abnormal wood construction. UNDULATING ripple. Interlaced threads, spirals, etc.

Resin pocket 7.1.3 resin pocket resin pocket a bean-shaped cavity in wood that contains or has contained a resin-like substance.

7.1.4 laminated Bark Bark Bark Bark Bark pocket due to tree growth, all or part of bark encased in wood.

7.1.5 resin streak resin strips after local injury, the resin accumulates and penetrates into the surrounding wood to form a deeper color than the surrounding normal wood.

7.1.6 worm holes. A hole or canal made by borers or their larvae in wood.

7.1.7 marks of parasitic plants clusters of small channels formed by the penetration of wood by parasitic or SAPROPHYTIC plants.

7.1.3 discoloration a change in the normal colour of wood is called discoloration and can be divided into chemical discoloration and fungal discoloration.

7.1.8.1 false heartwood the central part of sound wood is a different color than normal wood, usually dark brown or reddish brown, and usually has a higher density and hardness.

7.1.8.2 chemical discoloration of wood caused by chemical reactions between chemical stain wood components and certain foreign substances.

7.1.8.3 Fungal hyphae and spores on the surface of mould wood.

7.1.8.4 blue stain, also known as blue stain. sapwood turns grey with a slight bluish or greenish tinge.

7.1.8.5 Calli from insect infestations in the Cambium of pith flicks wood prior to felling. The medullary plaques are fragile.

7.1.8.6 flecks streaks are wood decay fungi which can be found in the early stage of wood invasion. A Brownish or purplish-red stain.

7.1.9 decay rot due to the invasion of wood decay fungi, cell wall material decomposition, resulting in wood softening, strength and density decline, wood tissue and color are often changed.

7.1.9.1 slight changes in the chemical composition of incipient decay wood due to erosion by fungal growth generally show slight changes in hardness and discoloration prior to drying, resulting in changes in wood properties.

7.1.10 rows of pin holes made by Hook and picker's tools during log shipping of dog holes.

7.1.11 split, end split fibers are split along the grain, usually starting at one end and extending through the thickness of the early plate.

7.1.12 crack check sheet fiber short separations, usually do not start at the edge of the sheet, are not always extended through the veneer thickness.

PLYWOOD DEFECTS:

7.2.1 seam open Joint the Joint between two adjacent veneers in the same layer is not tight.

7.2.1.1 core plate gap core gap gap gap gap gap or core gap gap.

7.2.1.2 long and medium plate gap.

7.2.2 overlap two parts of an adjacent veneer or a cracked veneer within the same veneer.

7.2.3 blister blister local separation due to gluing failure between adjacent veneers.

Delamination separation of adjacent veneer due to lack of glue or poor gluing.

7.2.5 local indentation on hollow panel.

7.2.6 indentation -- local indentation on the imprint panel.

7.2.7 bump bump bump bump bump appears partially superthick on the dashboard.

7.2.8 lathe check cutting check the tiny cracks that can be seen when the loose face of the slab is configured outwards.

7.2.9 burr furrow marks torn grain roughens the surface of plywood due to fiber tearing.

7.2.10 roughness the unevenness of a plywood surface.

7.2.11 sand penetration sandlng through due to excessive sanding of the surface plate, the glue layer or the next veneer is exposed at the local sanding point.

7.2.12 transgluepenetration adhesive penetrates the face plate and contaminates the face plate.

7.2.13 adhesive tape inclusion of gummed tape.

7.2.14 metallic substances metallic substances such as U-PINS are found in metallic inclusions plywood.

7.2.15 defects at the edges of the panel caused by Sanding, sawing or impact.

7.2.16 warPing is generally a regular deformation in which part or all of the surface of the corrugated plywood is curved.

PLYWOOD REPAIR:

8.1 Repaired Plywood Repaired Plywood defective plywood repaired with fillers or veneer patches.

8.2 filling holes and other defects with filler.

8.3 PATCH INSERT INSERT INSERT INSERT pre-cut defect areas with well-formed veneers of various shapes.

8.4 Patch patck plug patch geometry veneer.

8.5 Thin Long Veneer for Shim repair.