Why does bamboo crack? How long does it take to boil bamboo before it cracks?

Bamboo. There are many reasons for cracking, and there are three main cases:

1 Bamboo cracking is related to the difference in the degree of shrinkage of the inner and outer layers;

2. Bamboo cracking is related to the climate, temperature and humidity of the outside world;

3 Bamboo cracking is related to the presence or absence of bamboo joints when the material is taken.

The bamboo tube can be maintained in the following ways to prevent cracking:

1. Avoid exposure to the sun and high temperature, and store in a ventilated and cool place.

2. Avoid moisture to prevent mold from occurring. Prevent ventilation in a cool place, away from mold. Check it often.

3. Regular dust removal (with a soft brush such as a brush) and maintenance, the maintenance method is to wipe walnut oil with a soft cloth.

Keep it clean and protected from insect damage. Bacterial growth.

After the bamboo is cut, life activities cease, the water gradually evaporates, and the layers of tissues begin to shrink, especially in the dry north, and the shrinkage rate depends on the water content.

The inner layer has a low water content and small shrinkage, and the circumference after shrinkage can be regarded as unchanged.

The fleshy layer contains more water and shrinks greatly, and the diameter should be smaller and the circumference shorter after shrinkage. However, due to the constraints of the hard inner layer, the circumference becomes shorter and the hoop stress of the fleshy layer increases. When the hoop stress rises beyond the strength limit of the fleshy layer, the fleshy layer is pulled apart, and cracks appear along the axis of the bamboo tube.

After the fleshy layer splits, the stress is relieved and the cracking stops.

Although the inner layer and glaze are hard, they are firmly attached to the fleshy layer and crack with the propagation of cracks in the fleshy layer.

Bamboo products are afraid of drying, and if they are too dry, they are easy to crack, so we should pay attention to them in autumn and winter.

There are three points to pay attention to when bamboo products do not crack:

First, it is the most important to buy bamboo products made of 8 to 10-year-old bamboo, especially high-end bamboo art.

Second, apply natural resin to prevent cracking.

The third is maintenance.

1. Drying and ventilation is the most important because of the particularity of bamboo furniture, so it should be placed in a dry place, if it is often placed in a humid and dark place, it will be beneficial to the reproduction of microorganisms due to humidity, and mildew is easy to occur.

For example, large bamboo utensils such as cabinets, bookshelves, and reclining chairs should be removed from the cracks, rinsed with water, and dried.

Especially for bamboo utensils that are not used temporarily, they should be washed and dried, and then stored in a dry and ventilated place.

2. Make sufficient preparations in advance If you have the conditions, you can apply varnish and cooked tung oil when you just buy back bamboo furniture.

This is not only moth-proof, but also durable and beautiful, which is a good thing to kill multiple birds with one stone.

Newly purchased small and medium-sized bamboo products such as baskets, mattresses and other products are best resteamed by high-temperature sealed steam.

Steaming for 2-3 hours can completely kill the insects and microorganisms hidden in the bamboo.

You can also use boiling water and a certain amount of salt to soak the bamboo for 1-2 days, which can also prevent insect moth.

If insects are found, the following methods can be used to remove insects: first, use an appropriate amount of sharp pepper or pepper, mash it into the end, stuff it into the moth hole, and flush it with boiling water, which has the effect of killing insects and can prevent the spread of insects; The second is to mix it with kerosene and a trace amount of dichlorvos, and drip it into the cavity, which can also kill the moth.

However, this method is not suitable for baskets, cabinets and other bamboo utensils to store food, in order to prevent accidental bamboo moth prevention and antiseptic treatment 1) The physical methods mainly include high temperature method, water immersion method, smoke method, modified atmosphere method, far infrared method, microwave method and ray method, and the advantages of these methods are pollution-free and five residual poisons.

The disadvantage is that treated bamboo or bamboo products may be infected with borers and mold if they are not stored properly.

In addition, bamboo felled in spring is susceptible to insect damage, and bamboo cut in winter is less susceptible to insect damage, so bamboo felling should be arranged in winter as much as possible.

Moreover, the cut bamboo should be transported to the production site as soon as possible for use, or treated with insect and moth prevention to reduce insect moth and mildew.

2) The chemical methods mainly include coating method, impregnation method, cooking method, fumigation method and pressure injection method.

The advantage of these methods is that the anti-moth and anti-corrosion effect is good, and the time is long, and the disadvantage is that some agents are toxic and easy to pollute the products and the environment.

In the process of drying and water loss of bamboo, due to the difference in the tangential and meridional shrinkage of bamboo, great internal stress will be generated, which will cause longitudinal cracking. Therefore, the bamboo should be placed in a ventilated room to dry naturally. In this way, the drying speed is slow, which can weaken the internal stress of bamboo and reduce the cracking rate of bamboo.

Cracking caused by drying problems is easy to crack if it is too dry, and it is not easy to crack if it is too wet, but it is easy to breed bacteria to rot, and it will crack if it dries too quickly.

Bamboo does not crack after boiling for 4 to 6 hours. Bamboo is a material with poor stability and is more prone to cracking and insects, so the common method to prevent bamboo from cracking is to boil it in salt water. Boil the bamboo in water, over low heat, without boiling the water.

After cooking, the bamboo can be left to dry in a cool and ventilated location. By using high temperatures in this way, the structure of the bamboo can be made stronger and less prone to deformation.

In addition, storing bamboo in a dry environment is the most effective method. Freshly cut bamboo, with the drying method can prevent the bamboo from cracking, the cut bamboo in a cool and ventilated place to dry, generally two to three months later, when the moisture inside the bamboo is completely dry, you can use bamboo to make tools.

When you first start using bamboo products, you should not pour boiling water directly to avoid cracking caused by uneven heating inside and outside of the bamboo. Bamboo products cannot be stored in stagnant water for a long time, because bamboo cannot be soaked for a long time, and the bamboo will deform and crack after excessive water absorption. After soaking in light salt water, it is then steamed with water for about 30 minutes to prevent bamboo mildew and insect cracking.

If the finished bamboo products need to be used as a collection, they need to be sealed and stored in a special wooden storage cabinet, so as to control the temperature and humidity and avoid the environment being too dry.

To keep the bamboo from cracking, the environment in which the bamboo is stored needs to be humidity between 20 and 40%, and the temperature difference does not exceed 20 degrees in a day. You can also brush the surface of the bamboo with varnish to isolate the external environment to achieve the purpose of preventing cracking.

Bamboo is very versatile, the young stems of the plant are edible, nutritious, and beneficial to human health, and some bamboos can also be used to make bamboo rice. Dried bamboo can be used as bamboo tools, such as bamboo chopsticks, brooms, bamboo mats, bamboo baskets and musical instruments.

Newly cut bamboo, according to tradition, needs to be soaked in water for a week, and then dried in the shade for half a year, until the water inside the bamboo is dried in the shade, and the nature is stable before it can be used to make bamboo products. This method is reliable, but it takes a long time. In addition, the new bamboo can also be roasted on a low fire to remove the moisture inside the bamboo, and the moths and eggs inside the bamboo can be killed by high temperature to achieve the purpose of mothproofing.

Bamboo soaked in water for a long time rots. Because bamboo is an evergreen (a few bamboo species lose their leaves in the dry season) shallow-rooted plants, they have high requirements for water and heat conditions, and they are very sensitive, and more water will cause the bamboo to be impermeable, thus dying and rotting.

Bamboo growth environment: Bamboo's requirements for water must be sufficient and well drained. Due to the shallow underground stems of clumped and mixed bamboos, the bamboo shoot period is in summer and autumn, and the new bamboo cannot be fully lignified in that year, and cannot withstand cold and drought, so the growth of the north is generally restricted.

Water requirements for bamboo growth:Bamboo should be planted in a leeward, sunny and humid environment. Bamboo grows fast and grows in large quantities, and has high requirements for water and fertilizer, requiring sufficient water and moisture, but also good drainage.

It requires a deep and fertile soil, rich in organic matter and mineral elements, and acidic soil. Common garden plantings include moso bamboo, phoenix bamboo, light bamboo, dry garden bamboo, rigid bamboo, etc. Bamboo water blight should be strengthened and tending management and reasonable felling.

The above content reference: Encyclopedia - Bamboo.

1. Please pour water directly into the bamboo at the beginning of use, so that the bamboo is heated inside and outside and cracked, please store the water in the bamboo for fear of blisters between the blisters and cause its deformation, the inner layer of the bamboo is worth the bamboo clothes, please try to brush with dish soap, please clean and dry after each use, so as to avoid its mildew.

2. Soak in light salt water for 3 and then steam with water for about 30 minutes to prevent bamboo mildew and insect cracks. If it is used to dry, seal it with a plastic bag and store it in a moisture-proof bag.

3. If you need to make a special wooden cabinet for the preservation of collectibles, the temperature is 20 to 35, the humidity is 35% to 40%, the temperature is dry, and the temperature is high, put a bowl of water or a few books in the cabinet in the cabinet, and put half a cup of water in the dry in summer, and keep a fixed distance from the water cup.

4. The current non-use of various medicinal waters, cooking, smoking, etc., has been treated with bamboo utensils, which has been conducive to physical health, and the bamboo products in the store have not been treated to avoid cracking.

As early as the Shang and Zhou dynasties, China had invented the use of bamboo drills. In 251 B.C., Li Bing was appointed as the Sichuan Tai Punctuality, and he led the people to build the world's first farmland water conservancy irrigation project - Sichuan Dujiangyan. A large amount of bamboo is used in it.

The world's oldest water pipe is made of bamboo, which was called "Jian" in ancient times; In Sichuan, where bamboo is abundant, salt wells with a depth of 1,600 meters were drilled with bamboo cables during the Han Dynasty. It wasn't until the 19th century that this technique of drilling wells with bamboo cables spread to Europe, and in 1859 the first oil well was drilled in Pennsylvania by the United States.

As early as the 9th century, China began to use bamboo to make paper, and papermaking became one of the four great inventions in China. One of the four treasures of the study, the brush, the bamboo branch is the best material. The prestigious lake pen has developed into four categories, more than 250 varieties, which are not only handy writing instruments, but also pleasing handy crafts.

Summary. Hello, bamboo cracking prevention methods: 1. Please do not pour boiling water directly when you first use it, so as to avoid cracking due to uneven heating inside and outside the bamboo.

Please do not store stagnant water in the bamboo for a long time, because the bamboo is afraid of long-term blisters, excessive water absorption will lead to its deformation, the inner layer of bamboo is very valuable bamboo clothes, please try not to use dish soap to scrub, please clean and dry after each use, so as not to mold. 2. Soak in light salt water for 3 hours, and then steam with water for about 30 minutes to prevent bamboo mildew, insect moth and cracking. 3. If it is not used for a long time, it can be sealed and stored in a plastic bag after drying, and a moisture-proof bag can be placed.

What to do if the bamboo cracks, and how to prevent it.

Hello, bamboo cracking prevention methods: 1. Please do not pour boiling water directly when you first use it, so as to avoid cracking due to uneven heating inside and outside the bamboo. Please do not store stagnant water in the bamboo for a long time, because the bamboo is afraid of long-term blisters, excessive water absorption will lead to its deformation, the inner layer of bamboo is very valuable bamboo clothes, please try not to use dish soap to scrub, please clean and dry after each use, so as not to mold.

2. Soak in light salt water for 3 hours, and then steam with water for about 30 minutes to prevent bamboo mildew, insect moth and cracking. 3. If it is not used for a long time, it can be sealed and stored in a plastic bag after drying, and a moisture-proof bag can be placed.

4. The best way is to use it often and play with it often, so that the bamboo can be bright and natural. 5. If you need to keep it as a collection, it is best to make a special wooden inner lattice cabinet for safekeeping. The temperature of the special safe deposit box is between 20 and 35 and the relative humidity is between 35% and 40%.

If the temperature is too dry and too high, you can put a bowl of water indoors or put a few books in the cabinet. When it is too dry in summer, you can put half a glass of water on the grid, but keep a certain distance from the water glass. The method of putting old newspapers can also be used, but the recirculation of newspapers is strong and should not be more.

6. Bamboo cracking prevention is a very high-level technical problem, the current method is nothing more than a variety of medicinal methods such as cooking, smoking, etc., but the bamboo processed by this method is not conducive to physical health. If the bamboo products in the small shop have not undergone this kind of treatment, it is inevitable that there will be cracking; Therefore, it is recommended that consumers choose some regular manufacturers to buy bamboo products when they buy them, but ensure that they will not crack prematurely during use.

It should be cut down, and when it is raw, it should be soaked in preservatives, and then it is soaked in glue, and it should not crack after drying.