Causes of Thickness Deviation of Medium Density Boards
It is believed that both the MDF manufacturer and the MDF distributor will often receive feedback from customers that the actual thickness of the sheets purchased by customers is different from the thickness they require. Normally, the deviation of normal thickness of sheet metal is (+0.2mm). Of course, the quality of thickness deviation of finished products will also be caused by various reasons in the production process of sheet metal. So what are the main reasons for the thickness deviation of MDB?
- Uneven Pavement of Raw Materials
In the production process of MDF, the uniformity of raw material pavement is one of the important factors affecting the thickness deviation of finished products. If there is an uneven weight or uneven pavement in the slab, it will lead to thickness deviation of other layers of slab, and “wedge” and thick Boards, thin Boards will appear.
- Deformation of Hot Press Boards
Thickness of Medium Density Boards
At present, the thickness deviation of MDF produced by most factories in China is caused by the deformation of hot-pressed Boards. There are two main reasons for hot pressing Boards deformation: uneven heating during preheating and excessive temperature rise; missing slab, light slab and short slab occur in the production process.
- Asymmetry of Slab Position in Hot Press Boards
When the position of slab is asymmetrical in the hot-pressing Boards, the hot-pressing Boards can not always maintain a horizontal state during the pressing process, which results in thickness deviation.
- The position control of hydraulic system is inaccurate