With the reduction of wood resources, especially precious wood resources, more and more furniture uses pressure processes such as veneer or stickers. As an important equipment of pressure processes, hot presses are often used to make veneers and pressure forming parts for furniture. Their production capacity and technical functions constrain the production scale and product quality of enterprises. In order to better understand and select the hot press, this paper introduces the working principle of the veneer hot press commonly used in the furniture industry.
In fact, the operating principle of the hot press is to conduct positive pressure on the basis of negative pressure and use special glue for processing. The hot press has the characteristics of high pressure, low temperature and short film pressing time. It solves the deformation problem of workpieces processed by negative pressure equipment, reduces the deformation degree of workpieces, and ensures the quality and function of products.
The hot standby of the existing hot press on the market can actively complete the processing process of entering, upgrading, heating, vacuum, forming, demoulding, and dropping. It is mainly driven by oil pressure and compressed air, so there should be enough air pressure and volume. The structure is composed of steel plates, and all structures are reasonable. The two workbenches can be used circularly or independently.
Hot press is widely used in furniture production, wooden doors, wood-based panel secondary processing veneer and other factories. Hot press can be said to be one of the most important woodworking machines. The primary function of the hot press in wood products processing is to press and glue furniture boards, building partitions, wooden doors, fire doors, etc. The wide application of hot press is mainly reflected in the application of plywood, blockboard, medium fiber board, particleboard, various decoration materials, decoration cloth, wood veneer, PVC and other man-made boards, and it can also be used for the drying, flat veneer, flat and molding of color decoration boards.
The press host can be divided into three parts: heating system (supply heat source), hydraulic system (supply pressure and control press action) and press body (frame and control part). Generally speaking, the hot press is evaluated and selected primarily according to its function, reliability, service and price. This article mainly introduces the function and reliability of the hot press.
The production problems of the hot press itself are not many, but a large part of them come from the hydraulic system, such as oil leakage and failure to maintain pressure. Many common sense and requirements about hydraulic system cannot be fully described here, but we must pay great attention to them when selecting them.
The control system of hot press mainly controls the operation of heating system and hydraulic system, and its sensitivity and accuracy directly affect the accuracy of press operation. Due to the messy composition of the control part, it is generally a problem prone part. For the press with disordered functions, such as vacuum coating veneer press, many domestic press manufacturers directly import foreign control systems, and try to reduce the use of low reliability control components such as solenoid valves. Generally speaking, the hot press used in the furniture industry can consider the function and reliability of the operation from the above aspects. During production, there will be many veneering process problems to be analyzed according to the specific situation.