The hot pressing Wood veneer Melamine paper /melamine overlay paper lamination process of wood based panels is determined by three factors to determine the final effect
With the rapid development of the panel furniture industry, more and more people are using artificial boards to make customized furniture. The price of ecological boards on the market varies, and the price of artificial boards depends not only on the raw materials used (such as board core, decorative paper, adhesive, and plywood), but also on the Wood veneer Melamine paper technology used.
Firstly, let’s learn about the Wood veneer Melamine paper technology of panel furniture. The Wood veneer Melamine paper process includes the process methods, standardized operations, processing conditions, and other contents in the Wood veneer Melamine paper , which is a key link to ensure the quality of the Wood veneer Melamine paper .
1. Process methods
Sanding the thickness of the plain board is an important process to ensure uniform thickness and improve the quality of the board surface. Poor operation or reducing this process will cause Wood veneer Melamine paper defects, which cannot be remedied in the later stages of the process. The glue coating process is to evenly apply a certain amount of glue to the surface of the substrate. Excessive adhesive content can make the adhesive layer harder and more brittle; Insufficient or uneven application of glue can result in local glue deficiency, leading to blistering; When preparing the blank, the adhesive material on the back of the surface should be symmetrical, otherwise it will cause uneven stress on the surface of the substrate, leading to warping of the board.
2. Processing conditions
During the Wood veneer Melamine paper process, good processing conditions should be ensured, such as a clean environment, suitable humidity, temperature, and pressure. Before applying glue, ensure that the board surface is clean. After applying glue, prevent dust particles from falling on the board surface, otherwise there will be granular protrusions on the board surface.
3. Standardized operations
During Wood veneer Melamine paper processing, it is necessary to strictly follow the process standards for operation. Especially in the process of substrate coating, the adhesive is first prepared in a certain proportion, stirred evenly, and then added to the coating machine in a special container. In practical operation, workers will directly add the main agent of the adhesive to the glue roller, then add modified materials such as lignin powder, and stir on the glue coating machine. This will result in, on the one hand, uneven mixing of the adhesive, resulting in large particles; On the other hand, it will damage the glue applicator; After applying glue, there are local defects such as missing glue and granular protrusions.
The commonly used processing process for melamine Wood veneer Melamine paper s is the hot pressing process. However, it should be noted that there are three processing factors that will affect the final effect during hot pressing treatment. These three factors are the time of hot pressing, the temperature of hot pressing, and the appropriate pressure.
1. Hot pressing time
Its length depends on the curing rate and hot pressing temperature of the melamine resin, generally within 40-50 seconds. Over time can cause excessive resin curing, loss of elasticity, and easily cause cracks or internal stress in the product, resulting in cracks and warping during subsequent processing. If the time is too short and the resin curing is not sufficient, it is easy to produce sticking phenomenon and affect the physical and chemical function of the product surface, which affects the durability of the product.
2. Hot pressing temperature
Mainly plays a catalytic role in the chemical reaction of melamine resin, that is, accelerating curing. According to the actual production requirements and the author’s experience, the temperature of the hot press plate is more suitable between 145-165 ℃. High temperature helps with demolding after pressing, shortens the hot pressing period, and increases production. However, excessive temperature prevents the resin from flowing uniformly and solidifying, resulting in small pores on the board surface.
3. Appropriate pressure
It can ensure a good combination between the substrate and melamine paper. Under appropriate temperature and pressure, the resin in melamine paper melts and solidifies, forming a closed and dense surface. It can also fill the small pores on the surface of the substrate that are unstable. When the pressure is generally 2.0-3.0 MPa, low pressure should be used as much as possible without affecting product quality, which is beneficial for the service life of equipment, hydraulic oil, and the internal structure of the substrate. But too low pressure affects the bonding strength and resin flow ability between the substrate and melamine paper.
