During the production, processing and use of wooden doors, the problem of door leaf deformation is often encountered. How to effectively avoid the deformation of wooden doors is a topic that everyone cares about. Today, I would like to share with you some secrets and measures to avoid the deformation of wooden doors.
The wooden door is only connected with 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. The reason for the deformation of wooden door lies in the unbalanced stress on both sides of the door leaf.
Based on the thickness center 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, bending deformation will occur;
This kind of stress imbalance is the result of the combined action of many factors, including the reasons of the wooden door itself and the external environment. The main factors leading to the deformation of wooden door leaf include the structure of the product, the materials used, the processing technology of wooden door, the storage, installation and use environment of wooden door, etc.
Cause Analysis of wooden door deformation
1. Deformation caused by asymmetric product structure
That is, the material characteristics of both sides of the door leaf should be inconsistent. Due to the different thickness of the facing material, the distance between the adhesive 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 curing process is the same, due to the difference of actuating arm, this causes the door leaf to be bent and deformed. Some small brand factories use good materials on the front and low-priced materials on the back when processing and manufacturing. Therefore, deformation is particularly easy to occur.
Requirements: in the production process of wooden doors, the thickness, type and structure of facing materials must be the same.
2. Deformation caused by improper material selection
As we all know, Wood is a kind of material with dry shrinkage and wet expansion. Within a certain range of moisture content, with the change of moisture content of wood itself, the size and shape of wood itself change, this phenomenon is called the dry shrinkage and wet expansion of wood, so this situation also exists in wooden doors.
3. Deformation caused by unreasonable technology
For example, the door leaf cannot be processed in the next process immediately after the finishing material is pasted. On the one hand, the adhesive is not completely cured; On the other hand, the adhesive contains a large amount of moisture, the moisture does not spread evenly in the glued material. For products processed by hot pressing, the temperature is much higher than the ambient temperature, and subsequent processing needs to be carried out after the product temperature is balanced with the ambient temperature. This balance process is called "Chen Hua" professionally ". After hot pressing, it can be directly stacked and stored for aging. It can also be used to dry the the trigger device, which can reduce the temperature of the door leaf in a short time, achieve the balance between the product and the ambient temperature, and shorten the aging time in the later period.
Requirements: wooden doors should strictly abide by the production process standards during the manufacturing process.
4. Deformation caused by improper installation
The technical quality of wooden door installation also directly affects whether there is deformation in the use of wooden door. If only two hinges are installed on the wooden door, the hinge will be heavy and enlarged, which is prone to deformation.
Requirements: when the wooden door is installed, 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 middle line in the thickness direction of the door leaf, and the opening flexibility must be ensured. In addition, 3 hinges should be installed for each door. The installation position of the hinge is 1/10 of the height of the upper and lower doors, and the Middle hinge is centered on the top.
5. Deformation caused by improper use
The deformation of wooden door is closely related to its environment. Besides deducting the factors of wooden door itself, there are also environmental factors leading to the deformation of wooden door. Because wood itself is easily affected by the surrounding environment, wooden doors made of wood materials are also easily deformed when the environmental conditions (mainly temperature and humidity) change greatly.
Requirements: for places with relatively bad conditions, such as the vent, one side is affected by the wind, and the other side is affected by the wind, in the process of use, we should try our best to avoid the large difference in environmental conditions between the inside and outside sides of the wooden door for a long time.
Editor: China Door Industry Network-dog thief
