What is the pressure of the plywood hot press machine
In the production process of plywood, the hot press machine is a crucial equipment, and the pressure parameters are one of the key factors determining the quality and performance of plywood. So, what is the pressure of the plywood hot press machine?
Firstly, we need to clarify that the pressure of the plywood hot press is not a fixed and unchanging value, but is influenced by various factors. This includes but is not limited to the thickness and number of layers of the board, the type of wood used, and the characteristics of the adhesive.
Generally speaking, for the production of common multi-layer plywood, the pressure of the hot press machine is usually between 1.0-3.0 MPa. Taking the production of a nine layer plywood with a thickness of 18 millimeters as an example, the pressure of the hot press machine may be set at around 2.0 MPa. This is because thicker boards require greater pressure to ensure firm bonding between layers and to achieve the expected density and strength of the board.
However, if producing thinner plywood, such as three-layer boards with a thickness of 3 millimeters, the pressure of the hot press may be relatively small, around 1.0 MPa. Because thinner boards can achieve good bonding effects under less pressure, excessive pressure may actually cause deformation or damage to the boards.
In addition, different types of wood can also affect the pressure of the hot press machine. For example, hardwood with higher density, such as oak, walnut, etc., may require greater pressure during bonding to ensure that the glue can fully penetrate and achieve good adhesion. For some low-density softwoods such as pine and poplar, the required pressure is relatively small. The characteristics of glue are also an important factor determining the pressure of a hot press machine. Some high-performance adhesives may achieve excellent bonding effects under lower pressure, while some ordinary adhesives may require greater pressure to ensure bonding quality.
To more intuitively feel the pressure of the plywood hot press, we can make a simple analogy. Assuming a person weighs 60 kilograms, the pressure generated when standing on a 0.1 square meter wooden board is approximately 6000 pascals. The pressure of plywood hot press machines is usually several thousand or even tens of thousands of times higher than this value.
In actual production, manufacturers will determine the most suitable pressure parameters for the hot press through continuous testing and adjustment based on specific production needs and product requirements. This not only requires rich experience, but also a deep understanding of raw materials and production processes.
For example, a plywood manufacturer initially produced a new type of high-strength plywood according to conventional pressure parameters, but found that the bonding strength of the product was not ideal. After multiple experiments and adjustments, the pressure of the hot press machine was finally increased to 2.5 MPa, successfully solving the problem and producing products that meet quality standards.
Another example is a company that mainly produces thin plywood, which discovered deformation issues during the production process. After investigation, it was found that it was caused by excessive pressure from the hot press machine. By reducing the pressure and adjusting it to 1.2 MPa, the problem of plate deformation has been effectively solved.
In summary, the pressure of the plywood hot press is a complex and variable parameter that requires comprehensive consideration of multiple factors to determine. Only under appropriate pressure can high-quality and high-performance plywood products be produced.
