The melamine veneer will crack during daily use, mainly due to the unevenness of the various parts of the wood. The part of the industry that is based on cracks is generally called cracking, cracking, internal cracking, and wheel cracking; the size and number of cracks will vary depending on the dry conditions, tree species, and wood section size.
The top ten brands of Chinese plate, Bai Bao, said that the phenomenon and factors of melamine veneer cracking
First, the end face crack.
The end crack is limited to the section of the wood, perhaps to one or both sides of the end, the latter being commonly referred to as a crack.
The primary reason is that the water conductivity in the direction of the grain is much larger than the direction of the grain. When the wood is dry, the transpiration of water from the end face is much faster than the transpiration from the side. The moisture content of the end is lower than that of the middle part, and the shortening of the end is restricted by the middle wood, so that the stretching action occurs at the end, and when the tensile force exceeds the transverse tensile strength of the wood, the end surface cracks.
Second, the appearance of cracks.
The surface crack refers to the crack of the original wood itself or the appearance, and the crack is usually limited to the chord surface and proceeds along the diameter direction.
Shallow surface cracks can be removed by planing, but deep surface cracks are not only ugly, but also reduce the strength of the wood, especially the shear strength. Appearance cracks also affect the quality of the wood paint. After the melamine board paint with cracked surface, cracks can open and close due to changes in climatic conditions, causing the film to break.
In order to ensure the performance of the melamine veneer, the Baibao health plate brand is excellent, in order to get the favor of consumers, in the production process, the process requirements are meticulous:
The first is pressure. If the pressure is too low, it will affect the adhesion strength of the substrate and the impregnated paper. However, if it is too high, it will affect the quality of the sheet, so this is a test point.
This is followed by the time of hot pressing, which depends on the degree of curing of the impregnating resin and the temperature of the hot pressing. If the time is too long, the curing degree of the resin will be too strong, and the original elasticity will be lost. In the latter processed product, cracking and deformation will occur; but if the curing time is too short, this will not be sufficient and easy. The phenomenon of producing a sticky sheet directly affects the performance of the surface and affects the durability of the product.
In the process of processing, Baibaobao plate starts from the details, guarantees the quality of raw materials and production process, and guarantees that the melamine veneers produced by the factory are all qualified products.
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