How to choose a large core board
Blockboard, commonly known as "large core board", consists of two layers of upper and lower splints, with a small arched wood strip pressed into the core.
The core material is the whole block. There is a certain gap in the middle and the surface is a single layer of thin plate. The core material is not more than 25mm wide, and the double-layer plywood is covered. The core material width does not exceed 7mm. A single layer such as a thick plate is weak.
The thickness of the blockboard (large core board) is also thick, and there are several specifications such as 16mm, 19mm, 22mm, and 25mm.
When the blockboard (large core board) is shipped from the factory, it shall have the quality appraisal certificate of the quality inspection department of the manufacturer, which indicates the physical properties of the blockboard (large core board). The blockboard edge of the blockboard (large core board) shall be marked with a clear, non-fading mark at 30mm, including the category, date of manufacture, manufacturer code and inspector code.
Pay attention to the following points when selecting blockboard (large core board).
1. The structure of the rubber layer is stable, there is no opening phenomenon, and there is no bubble or delamination between the panel and the core material.
2. Choose a plate with a low formaldehyde emission, and the smaller the irritating taste, the better.
3. Select the sheet with the product mark, the mark should be clear and non-fading, and the mark of the paper does not meet the national standard.
4. The quality of the core strip is sampled and can be sawed if necessary.
There are differences between hand panels and machine panels.
The most important factor determining the price and quality of the large core board is that the raw materials of the raw material board are divided into two types: hand-stitching and machine-stitching. The hand-stitching board is not as compact and flat as the machine board, and the width and thickness are easily biased. Therefore, the best hand piece is about 80 yuan each, which is the same as the middle and low price of the machine. In addition, the quality of the hand-made slats is poor, the board surface is rough, and the glue used is also relatively poor. Such a board is cheap, 40 to 60 yuan can be bought, but there are many quality problems in use.
The number of grinding is related to quality
The process of production directly affects the quality of the large core board. In the case of large cores, the quality of the sheet is polished by at least two times. The so-called two sanding is to polish the core of the large core board once, and then polish it once after pasting the skin. This is because the thickness of the panel is inconsistent. If it is not polished, the panel will be angular and will be deformed during use. Some plates are only polished after the dough is applied. At this time, the roughness of the core is difficult to be flattened. Although the sanding is smooth after the skin is applied, the roughness of the core will make the bonding not strong and the bulging. Affect.
The core is preferably a single wood
The core material is preferably a single type of wood, such as poplar, etc. If wood is used (that is, the corners of different woods are used to cut the edges), due to the different physical properties of various wood fibers, cold, heat, Changes in moisture, etc., will affect the quality of the core.
It is best to consult a professional when selecting
Since the material of the core is not visible from the appearance, the manufacturing process of the large core is difficult to understand, so it is difficult to see the advantages and disadvantages when selecting the large core board. Experts believe that in addition to buying with the professional procurement staff of the expert or decoration company, consumers can also judge by simple means. If you pick up a corner of the big core board, listen to what is inside the board.
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