The door leaf is deformed, why?
When the wooden door is in use, it sometimes bends and deforms. Do you understand that it is deformed? Xiaobian is here to tell you.
The wooden door is only connected to the door frame by the hinge (or hinge) on the left or right side of the door leaf during use, and the rest is in a free state, and the reason for the deformation of the wooden door is the stress imbalance on both sides of the door leaf. Based on the center of the thickness of the door leaf, when the stress on both sides of the door leaf is equal, the door leaf is in a straight state; when the stress on both sides of the door leaf is different, the stress balance is broken, and the bending deformation occurs, and the bow surface of the door leaf is pulled. Stress, the concave surface is subjected to compressive stress.
This stress imbalance is the result of a combination of factors, both the cause of the wooden door itself and the external environment. The factors that cause the deformation of the wooden door leaf are mainly the structure of the product, the materials used, the processing technology of the wooden door, the storage, installation and use environment of the wooden door.
The specific analysis is as follows
1. The product structure is asymmetrical and deformed.
That is, the material properties of the two sides of the door leaf should be inconsistent.
Due to the different thickness of the facing material, the distance between the rubber layer on both sides of the door leaf and the center line of the door leaf is inconsistent. Although the stress generated by the adhesive during the curing process is the same, the door leaf is bent and deformed due to the difference of the force arms.
Therefore, in the production process of the product, the thickness, type, moisture content and structure of the facing material must be required to be the same. Some small-brand factories use good materials on the front and low-cost materials on the back.
2, improper selection of materials to cause deformation
It is well known that wood is a material that shrinks and swells. In a certain range of water content, with the change of the moisture content of the wood itself, the size and shape of the wood itself are changed. This phenomenon is called the shrinkage and swelling of the wood. This is also the case with wooden doors made from wood. At the same time wood is an anisotropic material. The physical and mechanical properties of the different directions are very different. Closely related to the deformation of the door leaf is the coefficient of shrinkage of the wood. The different directions of the wood and the coefficient of dry shrinkage are relatively large. The dry shrinkage coefficient of the wood is the largest, followed by the radial direction, and the smallest is the longitudinal direction. In general, the chord direction is 1.5 times the radial direction, and the chord direction and the radial direction are tens to hundreds of times in the longitudinal direction. The shrinkage and swelling of wood varies with tree species, density, and the like. The dry shrinkage of softwood is smaller than that of hardwood; soft broadleaf is smaller than hard hardwood; the higher the density, the larger the shrinkage.
The main material selected for the production and processing of wooden doors is wood or wood-based panels. The choice of materials should focus on controlling the moisture content of the wood and using dry-qualified wood, which can effectively reduce the shrinkage and swelling of the wood. At the same time, attention should be paid to controlling the moisture content gradient of wood, and there should be no phenomenon that the local moisture content is too high or too low.
The use of glulam as the main keel inside the door leaf can increase the product's ability to withstand external forces. Glulam, also known as glulam, is a face-to-face type of small wooden strip (or narrow, short small wooden strip) that is machined to match the "V" type gutter and hoe, and then coated in the gutter. The upper part of the adhesive is glued in the longitudinal direction (end-stitching), and then the horizontally glued into a certain width (horizontal) sheet, and the glue in the thickness direction can also be carried out as needed. Glulam does not destroy the structure of the wood itself, can maintain the natural texture and texture of the wood, overcome the natural wood easily deformed, cracked, surface has knots, insect eyes and other defects, tensile and compressive strength is better than wood, good material, size High stability.
3. Unreasonable process technology causes deformation
For example, after the door leaf is covered with the finishing material, it cannot be immediately processed into the next process. On the one hand, the adhesive is not cured completely, and on the other hand, because the adhesive contains a large amount of moisture, which is not in the glued material. Spread evenly. For products processed by hot pressing, the temperature is much higher than the ambient temperature, and the subsequent processing is required after the product temperature and the ambient temperature are balanced. This balancing process is professionally called "Chen Hua". After hot pressing, it can be directly stacked and aged for aging. It can also be used as a drying machine to reduce the temperature of the door in a short period of time, to achieve a balance between the product and the ambient temperature, and to shorten the post-aging time.
4, improper installation caused deformation
The quality of the installation of the wooden door directly affects the deformation of the wooden door during use. When installing the wooden door, the verticality of the door frame and the door leaf must be ensured, so that the center of gravity of the door leaf is on the center line in the thickness direction of the door leaf, and the opening is flexible. In addition, it is recommended to install 3 hinges per door. The position of the hinge installation is 1/10 of the height of the door leaf from the upper and lower doors, and the middle 1 piece is centered on the upper side. Compared with the installation of 2 hinges per door, although it will increase in cost, it will play a very good role in preventing or reducing the deformation of the door leaf.
5, improper use caused deformation
The deformation of the wooden door is closely related to the environment in which it is located. In addition to the factors of the wooden door itself, the cause of the deformation of the wooden door is the environmental factor. Since the wood itself is easily affected by the surrounding environment, the wooden door made of wood material is easily deformed when the environmental conditions (mainly temperature and humidity) vary greatly.
For places with poor conditions, such as the tuyere, the wooden door is prone to deformation during use. The environmental conditions on the outer and outer sides of the wooden door should be avoided as much as possible for a long time. Pay special attention to the season of heating and the season of wind. During the heating season, the ambient temperature between the inside and outside of the wooden door due to heating should be avoided for a long time, and the environment on the side of the wooden door should be prevented from being too humid.
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