English
In the past few years, the production of plywood and veneer paneling has experienced a significant revolution in both quality and production capacity, especially in the Italian market. Historically, this market has been one of the most important and technologically advanced countries for the production of products in this area.
One of the main reasons for this development, of course, is the competition between particleboard manufacturers and fiberboard manufacturers. These manufacturers have seen amazing leaps in the overall productivity of their factories and the rapid increase in the use of their products in the market. For this reason, plywood manufacturers have to find commercial outlets and new products in order to effectively counterbalance the rapid growth of particleboard products.
However, we must admit that this production method of plywood, especially in its inherent performance, has seen very important technological advances, such as those products produced from wood chips as raw materials.
The above development has produced significant results. One of them is that the final consumer pays greater attention to the surface finish of the board, not only in the form of raw materials, but also in value-added products.
Most Italian manufacturers install a sanding operation system on such a machine: two sanding heads are opposed to each other, and each is equipped with a contact roller, wrapped with natural rubber of different hardness.
This solution actually means that the surface of each board is sanded with only one abrasive belt. Therefore, it should not only meet the tolerance requirements of the amount of material to be cut, but also meet the needs of perfect surface finish. This is done by a single artificial grindstone (according to the normal standard, the hardness of the artificial grindstone ranges from 60 to 100).
However, if you want to correct the operating parameters in order to achieve the best results in the sanding process, the situation will become very complicated. This is caused by those variables in the quality and type of wood, the way the adhesive is used, etc.
The following fact should not be ignored: even if sanding of particle board is an indispensable job, then there is some serious consumption in the production process, because a large amount of "raw" wood is cut off . As a result, people usually have to work hard to "minimize" the loss of the product to be sanded.
In the past few years, some manufacturers have also taken the initiative to take measures to find ways to solve many problems existing in sanding plywood. This is solved by using three, four or five sanding mechanical devices. The solution using three sanding mechanisms uses one conveyor belt under the top surface and two conveyor belts above the top surface. The solution with four mechanical devices is to install two conveyor belts on each surface.
Obviously, it is not always necessary to use all the devices of the sander at the same time. The choice should be based on the properties of the wood and the required surface finish.
In addition to the number of sanding heads required for sanding plywood, another important aspect of this development (which may be mistaken for trivial at first glance) is the different design of the processing equipment. Whether it is from the perspective of the inherent characteristics of the sanding heads, or from the selection of their geometrical layout in the production line, this is the case.
Let us take a closer look at what the characteristics of the sanding device mean:
1. Equipped with a sanding device that touches the roller. The diameter of the roller ranges from 230mm to 550mm. It is made of steel or rubber and has various hardnesses ranging from 30 Shores to 60 Shores. .
2. A sanding device equipped with a sanding drum and a wear-resistant bottom support (or pressure plate). This refers to the combined operating parts of the abrasive belt in a conveyor belt, including a natural rubber-coated roller and an anti-wear device.
3. Equipped with a sanding device with a fine sanding cylinder (press plate).
The geometric arrangement of these devices is related to the relative positions of each sanding head and other sanding heads. Therefore, we can make the sanding heads opposite to each other, or stagger each other, that is, make them in an asymmetrical position.
