How can wood be cracked? How to prevent wood from cracking

Wood crack resistant. 1. Stacking method. Logs are large in size, and common storage is stacked outdoors, and the way of stacking reduces the direct contact of logs with sunlight and rain, and reduces the humidity and temperature of wood cracking due to environmental changes.

Place it in a ventilated and cool place to naturally reduce the moisture content of the wood and keep it at the same level as the ambient humidity. At the same time, the method of bundling is used to prevent the wood from expanding and cracking.

2. Reduce the volume. The larger the volume of the wood, the more serious the phenomenon of dry cracking will be, and it is stored in small volumes such as cutting squares or processing into planks.

3. Dry wood. Through machinery and equipment, the wood is dewatered, the moisture content of the wood is directly controlled, and then it is stored, which can greatly reduce the phenomenon of wood drying.

4. Before making something, first of all, the wood should be dried, and after the object is finished, apply a layer of clear oil, or soak it all with wax oil, the main purpose is not to let moisture or moisture enter, and it will not crack.

There are many ways to prevent wood cracking, and high-temperature styling can be used. It can effectively eliminate the possibility of internal cracking of wood, and can also use mechanical method to prevent cracking, that is, to use anti-cracking rings, and can also apply waterproof coating on the end and surface of wood, which can slow down the evaporation rate of wood surface, which can also reduce the cracking of wood. It can also be removed with a waterproofing agent, which is also a very good way to prevent cracking.

There are two types of wood cracking: one is natural cracking; The second is cracking in the process of wood drying. In general, there are many cracks in the wood drying process. There are several forms of wood cracking: surface cracking, internal cracking, end cracking and wheel cracking.

Ways to prevent wood cracking:

1. Adopt high-temperature qualitative treatment: the method of reducing wood internal cracking can be high-temperature qualitative treatment, and the residual deformation of the surface extension of wood that produces internal cracking can be eliminated by high-temperature and high-humidity treatment of wood before the end of the drying process. During treatment, the compression residual deformation of the surface layer of the wood due to humidification and expansion is offset by the original extension residual deformation, and the internal cracks of the wood are eliminated.

2. Mechanical anti-cracking: use wire to bundle the end of the dried wood, use anti-crack rings, combined nail boards, etc., and use mechanical methods to force the wood not to expand and contract, so as to avoid cracking of the wood.

3. Painting waterproof coating: Brush waterproof coating on the end and surface of the wood to slow down the evaporation intensity of the wood surface, which can reduce the moisture content gradient inside and outside the wood, and can also reduce the cracking of the wood.

4. Dipping treatment with waterproofing agent: The more effective method is to use waterproofing agent for pressure treatment, so that the waterproofing agent can deeply enter the wood to achieve a lasting good anti-cracking effect.

5. Improve the method of sawing when making timber: wood anisotropy, in the case of the same temperature and humidity changes, the largest wet expansion and dry shrinkage coefficient is the tangential direction, followed by the radial direction, and the longitudinal change is the smallest, so the sawing produces more radial cutting boards, which can reduce cracking. In particular, plates with a medullary core are prone to severe splitting when drying, which is caused by the difference in radial and chordal shrinkage near the medullary core, and the best way is to avoid producing plates with a medullary core when making the lumber.

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1. Mechanical anti-cracking:

Wire bundle ends are used on dried wood, crack-proof rings, composite nail boards, etc., and the wood is mechanically forced not to expand and contract, so that the wood can also be prevented from cracking.

2. Improve the method of sawing when making wood:

Wood anisotropy, in the case of the same temperature and humidity changes, the largest moisture expansion and dry shrinkage coefficient is the chordal direction, followed by the radial direction, and the longitudinal change is the smallest, so when sawing, produce more radial cutting boards, which can reduce cracking. In particular, plates with a medullary core are prone to severe splitting when drying, which is caused by the difference in radial and chordal shrinkage near the medullary core, which occurs in the early stage of drying, and initially the crack is only present on the surface of the end, and as the drying progresses it can be towards the medullary center and along the longitudinal direction. This type of crack is difficult to prevent when drying, and the best way to do this is to avoid producing a plate with a medullary core ("de-centering") during timber making.

3. Paint waterproof coating:

Applying waterproof paint to the ends and surface of the wood slows down the evaporation intensity of the wood surface, which can reduce the moisture content gradient inside and outside the wood, and can also reduce the cracking of the wood.

4. High temperature qualitative treatment:

The method of reducing wood internal cracking can be high-temperature qualitative treatment, and the residual deformation of wood surface extension that produces internal cracking can be eliminated by high-temperature and high-humidity treatment of wood before the end of the drying process. During treatment, the surface layer of the wood due to humidification and expansion produces compression residual deformation, which is offset by the original extension residual deformation, and the excess water is evaporated after treatment and shrinks with the inner layer of wood, so that the residual deformation can not be produced in the wood, and the internal crack of the wood is also eliminated.

5. Dip treatment with waterproofing agent

The more effective method is to use a waterproofing agent for pressure treatment, so that the waterproofing agent deeply enters the wood to achieve a long-lasting good anti-cracking effect.

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