Application and Selection of Hot Presses in Furniture Manufacturing

With the decline in precious timber resources, veneering processes have become widely adopted. Hot presses are critical equipment that directly impact production efficiency and product quality. This article introduces the hot presses commonly used in the furniture industry.

1. Technical Parameters of Hot Presses
– Platen size: Fits standard artificial board dimensions (1220×2440 mm)
– Pressure: Platen pressure 0.2–0.4 MPa, total pressure ~120 tons
– Other parameters: Daylight opening, closing time, heating temperature, etc., determined by process requirements
– Work cycle: Close → Pressurize → Hold pressure → Depressurize → Open

2. Machine Components
– Heating system: Provides heat
– Hydraulic system: Supplies pressure and controls movement
– Press body: Includes frame and control system

3. Key Selection Criteria
Selection should consider functionality, reliability, service, and price. This article focuses on functionality and reliability.

* 3.1 Heating System
– Heating methods comparison:
– Steam heating: Fast heating but uneven temperature
– Electric heating: Precise temperature control but high energy consumption
– Thermal oil heating: Uniform temperature but slow heating
– Hot water circulation: Low cost, suitable for low-temperature needs
– Heating platen performance:
– Material: Solid steel plates (for oil/steam heating) or welded aluminum plates (for electric heating)
– Thickness: Thin plates heat faster but deform easily; thick plates are sturdy but bulky
– Precision requirements: Flatness tolerance 0.1–0.18 mm, temperature variation ≤ 2–3°C
– Flow channel design: Single-channel, dual-circuit design meets most needs
– Connections and sealing:
– Common use of metal hoses or Teflon hoses
– Advanced sealing materials (e.g., PTFE) preferred

*3.2 Hydraulic System
– Core requirements: Fast closing and stable pressure holding
– Hydraulic cylinders:
– Large cylinders use alloy-cast pistons
– Small cylinders use chrome-plated carbon steel pistons
– Multi-cylinder design ensures even pressure distribution
– **Common issues: Oil leaks and pressure-holding failures require attention

*3.3 Control System
– Manages heating and hydraulic systems, affecting precision
– Complex machines often use imported control systems
– Minimize use of low-reliability components (e.g., solenoid valves)

Conclusion:
Selecting a hot press requires evaluating heating methods, platen performance, hydraulic systems, and control accuracy. Production adjustments should be made based on specific process needs.