Is there a crack in the solid wood desktop?

Regarding the cracking of solid wood furniture, many people's first reaction is "quality problem". However, if the problem is fed back to the merchants, many merchants may reply that it is a "normal phenomenon".

In fact, although solid wood furniture can not completely eliminate the risk of cracking, "minimizing the probability of cracking" is what manufacturers should do most, rather than taking "normal phenomenon" as an example.

Let's analyze why solid wood cracks. I hope everyone will face the matter of "cracking of solid wood furniture" rationally, don't be fooled by merchants, and take better care of furniture.

Reasons for Cracking of Solid Wood Furniture

Cracking of solid wood furniture and solid wood cracking are two levels of problems. The former involves technical and design issues, while the latter involves the performance characteristics of wood itself. If there are cracks, the corresponding solutions will be different.

1. natural wood cracking

Wood contains water, which can be absorbed and released indefinitely and repeatedly, regardless of whether it is scientifically dried or not. Thereby causing the expansion and contraction of wood, and thus causing dimensional changes.

Then why did it crack? For example, if a piece of wood is placed in dry air, it will continuously evaporate water through the exposed end face. When the end face is dry, it will shrink, but the inside of the wood is still wet and cannot shrink with it, so the two forces begin to compete, and finally the end face cracks to reach a balance.

This is caused by dryness, and humid air can also cause cracking, which is called bursting.

The wider and thicker a piece of wood, the more exposed the end face, the faster the moisture changes and the easier it is to crack, so when we make furniture, we have to face the following choices:

Wide plate or narrow plate: the pattern of wide plate is complete and beautiful, but the probability of cracking will increase a lot. Narrow plate has high safety, but it will sacrifice some value.

Short or long end face: rectangular imposition, if the short side is the end face, the water loss is slow and the cracking probability is low; On the contrary, the end face is long, the water loss is fast and the cracking probability is high.

2. Finite expansion and shrinkage cracking

Because wood has the properties of contraction and expansion, we can't nail it in the process of making, but also give it enough expansion and contraction space.

Frame tenon support crack

For example, traditional Chinese furniture will be made by assembling the frame, and then leave a gap of 3-5mm between the core plate and the groove of the frame. This gap is the reserved expansion joint and must not be omitted.

If this gap is not wide enough to limit its expansion, the outer frame tenon will eventually be pushed away by the core plate and cracks will appear.

3. Cracking at the splice

Glue is needed for patching solid wood. If the stitching is unscientific, the glue is not good or the operation is not standardized, it is easy to cause insufficient bonding strength between boards and lead to cracking.

There are many splicing methods of solid wood, besides flat splicing, there will be oblique splicing, cut splicing, concave-convex splicing and so on. Generally speaking, flat splicing is the simplest, and cutting splicing and concave-convex splicing are more complicated, but the gluing area is larger and firmer.

4. The paint film is cracked

Sometimes the wood of furniture does not crack, and there is a reasonable expansion space inside the wood, but the paint film on their surfaces is inelastic and will not expand and contract, so the paint film on the surface will break under the pull and extrusion of expansion or contraction, forming a cracking phenomenon. This is especially obvious when the paint film is white.

Because the normal process is cutting, assembling, polishing and painting, the paint film is like a piece of skin on the surface of furniture, and they will not keep pace with the wood inside.

It is also unrealistic to change the process flow to cutting-polishing-painting-assembly, because the paint film is likely to be damaged and the assembly will be affected in the later assembly process.

How to avoid cracking of solid wood furniture?

Because it can absorb and release water indefinitely, manufacturers and furniture users need to work together to prevent solid wood furniture from cracking.

First of all, for manufacturers:

1. Selected materials.

(1) the selected wood manufacturer.

Why is good wood expensive? Not only are the plates less defective and wider, but they are also painted on the end face before leaving the factory; The water content is relatively stable (generally 8-12%); There are protective measures during transportation and storage. ...

These measures are aimed at reducing the risk of wood cracking.

② Selected wood.

If one end of the wood is cracked, it is impossible to cut off only the cracked part. More parts need to be cut off to reduce the risk of cracking. Therefore, the material selection cost of furniture is very high.

2. Choose a good glue and a good puzzle.

Generally speaking, the more complicated splicing method is, the more difficult it is and the higher the cost is, but the risk of cracking will be smaller.

Such a good glue, combined with the correct scientific and standardized gluing process, can also ensure that the bonding strength between plates meets the requirements. If you cut corners, the risk of cracking will increase greatly.

3. Protect the end in the manufacturing process.

It takes a long time from cutting to final polishing and painting in the factory, and the temperature and humidity in different workshops vary greatly, so try to protect both ends with tape and paint after cutting to avoid moisture from entering and leaving.

4. Choose a good paint/paraffin oil.

Good materials can effectively prevent moisture from entering and leaving, so as to avoid drying shrinkage and expansion of wood and prevent it from cracking.

For example, for the open surface of space bound recovery flying, OSMO wax oil imported from Germany will be selected to protect the wood and restore the feel, touch and texture of the wood to the maximum extent.

If customers choose painting process, they will choose high-end waterborne wood paint to prevent moisture from entering and leaving.

5. Use good technology/structure.

Take a table for example. If the desktop is directly spliced and fixed with nails, it is likely to cause cracking or arching in future use.

Tapping tenon

It is much more scientific to install plates with economical frames or tenons, which is the experience of working people for thousands of years.

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Like this, it is also a good technique and method to hide the end as much as possible and not expose it.

If the manufacturer completes the above steps, whether in the south or the north, the probability of cracking of solid wood furniture will be greatly reduced.

Second, for consumers:

1, keep the humidity at 40-70%;

In fact, when furniture cracks most easily, it is the stage of ventilation and flavor dispersion, especially in the north. Because the northern autumn and winter weather is dry and cold, and the air humidity is low, doors and windows are particularly prone to cracking when furniture is opened. ...

If the smell is scattered in a dry environment, try to turn on the humidifier.

2. Don't leave oil stains and water stains on the furniture for a long time;

Stay away from the humid environment and never leave water stains.

3. Avoid direct sunlight;

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Even Fraxinus mandshurica, which has stable performance and good adaptability to dry climate, should be carefully cared for to avoid wind and sun exposure.

4. Stay away from the air outlet of heating or air conditioning;

5. Try to avoid outdoor use;

6. Avoid violent use of furniture and dragging furniture, resulting in loose structure and broken paint film;

7, don't use burlap, loofah balls, steel wire balls and other objects to wipe the surface of furniture, so as not to cause friction, thus destroying the surface and causing damage.

8, open surface treatment, regular maintenance, add wood wax oil/hot wax, especially the end face.

The above maintenance measures are aimed at all wood, and there is no solid wood that is not afraid of sun, heat and dryness.

Ok, enough about the cracking of solid wood. I hope everyone can take good care of their solid wood furniture in the future.

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