Wood preservation method (storage and drying of wood)

1. Dry storage method: Dry storage method can reduce the moisture content of log sapwood to 25% or below in the shortest time to prevent the propagation of bacteria and insects, but it can't completely prevent dry cracking.

2. In dry storage, it is best to peel the wood and classify it into layers or bundles, which is well ventilated and easy to dry.

3. Generally, the stare blankly height is not more than 2m. In order to make more rational use of mechanical work and stare blankly, it is allowed to pile higher stare blankly, but the clear distance between stare blankly intervals should be less than the height of stare blankly.

4. In order to reduce wood cracking, measures such as rough stripping (bast protection), shading and end coating (such as asphalt coal tar) can be taken.

5. Wet storage method: Wet storage method is a storage method to keep high moisture content of wood (80% ~ 120%) to avoid the occurrence of bacteria, insects and cracks.

6. The wet storage method is most suitable for newly-cut wood and wood transported to the site by water, but the bark is required to be preserved.

7. When the wet storage method is used to preserve wood, it is necessary to complete the work of returning to stare blankly in the shortest time.

8. In order to keep the moisture content of wood, the structure of the stare blankly is dense, the stare blankly is longer than 40m, and the spacing between the stare blankly is small, preferably around1m.

9. At the same time, it is best to create a light rain climate.

10. This limits the life activities of bacteria and insects, and it is also necessary to cover the surface of the stake with a layer of twigs or treetops as far as possible to keep the sapwood with high moisture content.

1 1. Water storage method: Water storage method keeps the highest water content of camouflage and prevents bacteria, pests and cracks.

12. Usually, in the timber yard near the water, the timber water is stored in the depths of the river, the tributaries of the river and the catchment with low flow rate.

13. In order to make the wood reach a higher moisture content, logs can be woven into rafts, which are completely immersed in water or semi-floating on the water.

14. Wood soaked in water can be peeled off, but camouflage floating on the water can't be peeled off, and it should be piled up densely, even in summer.

15. chemical treatment and preservation methods: in addition to controlling the moisture content of logs, chemical treatment can be supplemented to reduce bacteria, insects, damage and end cracks.

16. For wet storage method and dry storage method, spraying paraffin emulsion (10%) or coating synthetic coatings such as lime, coal tar or polyvinyl acetate emulsion and urea-formaldehyde resin (30: 70), carboxymethyl cellulose and urea-formaldehyde resin on the cross section of logs can prevent partial water evaporation at the ends of logs and reduce end cracking.

17. Piles sprayed with preservatives also have a certain anti-corrosion effect. Commonly used preservatives are zinc oxide, copper sulfate, zinc sulfate, sodium fluoride, sodium pentachlorophenol and so on. However, the control of spraying time and the penetration degree of liquid medicine into logs still need to be tested and explored.