HPL Line Heat Exchange System
The high-pressure water heating and cooling system is the most ideal equipment in the heating and cooling system of hot press machine. This hot water system can ensure a very accurate recycling in heating and cooling of hot press during production of making decorative HPL, plywood and insulating board. The control center has advantages of advanced intelligence, logical rigor, intelligent control and integrated plant.
Characters of HPL Production Line Heat Exchange System
(1) To ensure the heating supply, fast cooling, uniform and precise in the process of manufacturing decorative HPL, plywood and insulating board, guarantee the quality for the products, and also can improve the economic efficiency.
(2)It can save 30~40% energy consumption compare to the vertical type steam heating. Besides, it can be heated by many kinds of heating source such as steam and thermal oil.
(3) The water is used in a recycling system, so it can save much water resource.
(4)The heating system raise up the temperature gradually, holding temperature stability and slow down the speed of cooling, so that the equipment would not be affected by the shock of exchanging between heating and cooling.
(5)This high-pressure hot water heating-cooling system is designed by the current advanced technology from Germany, and it wins a technology leadership not only in domestic but also abroad market. It plays a key role in stabling the quality and improving the products grade, especially for the high-quality decorative laminated board (HPL).
(6)This system is widely used in the HPL production line. It wins the market with its excellent performance and outstanding value.
Parameters of HPL Line Heat Exchange System
| Content | Hot water heating system |
| Heating | Raising temperature gradually, accurate controlling. |
| Cooling | Moderate and low temperature is cooling down gradually. |
| Energy Consumption | Heating cycle start from 120℃, heating energy recycling use can save 1/3 energy. |
| Effect | Balance heating, uniform, accurate and energy-saving. |
Comparison of superheated water / steam /thermal oil
| Comparison Items | Superheated Water System | Saturated Steam Heating | High-Temperature Heat Transfer Oil |
| Heat Transfer Type | Liquid sensible heat circulation | Latent heat of vapor-liquid phase change | Oil phase sensible heat |
| Temperature control accuracy | Extremely high, ±1～2℃ | Generally, large fluctuations | Higher than |
| Thermal utilization rate | 85%+, zero circulation loss | 40-50%, waste in condensate drainage | 70-80% |
| Condensation and scaling | Low, closed-loop soft water | Severe, scale buildup and blockage | Not prone to scaling |
| System pressure | High pressure | High pressure | Low pressure |
| Plate quality | Uniform plate surface, low internal stress, excellent stability | Easily leads to uneven temperature differences and surface mottling | High temperature aging, yellowing of plate surface |
| Operation and maintenance cost | Soft water + descaling, moderate | Frequent sewage and descaling required, high pressure | Oil replacement, flammability risk |
Advantages of HPL Line Heat Exchange System
• Extremely Uniform Temperature: Liquid flows throughout the entire surface, resulting in minimal temperature difference between the upper and lower layers of the multi-layer press, ensuring HPL exhibits no warping, no delamination, and consistent color.
• Energy Efficiency: Fully enclosed closed-loop circulation eliminates condensate discharge, minimizing heat loss compared to steam.
• Smooth and Precise Temperature Control: Stepless temperature adjustment adapts to the entire heating, heat preservation, pressure holding, and cooling cycle, matching the resin curing curve.
• Extremely Low Internal Stress: Slow and uniform heating and cooling significantly reduce HPL's later-stage deformation and cracking.
• No Steam or Condensation: Does not contaminate the board surface or affect adhesive bonding strength.
