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Dieffenbacher
Preheating Systems

Preheating Systems

Product catalog summary

Introduction to Preheating Systems
Preheating systems are designed to enhance the efficiency of pressing operations in industrial manufacturing. They offer several advantages over traditional press extensions, including lower costs, reduced installation downtime, less space requirement, and increased production capacity. These systems are versatile and can be applied to various pressing systems, providing flexibility in product thickness and density.

Key Formula
The document highlights a critical formula: a 1°C increase in mat temperature results in a 1% production increase in the press.

Functionality of Preheating Systems
Preheating systems utilize microwave and steam technologies to improve heat and moisture transfer. Steam preheaters add moisture, while microwave preheaters shift existing moisture. This process reduces the required press time, extends the life of thermal oil, and increases capacity or product flexibility.

References and Performance
Steam preheaters have been installed in six lines, achieving significant capacity increases, particularly in PB lines. For example, a 28 mm thickness with a density of 630 kg/m³ saw a capacity increase of 27%. Microwave preheaters, installed in seven lines, show a capacity increase of about 30% with a temperature rise of approximately 30 K, independent of mat thickness.

Comparison of Microwave and Steam Preheaters
Microwave preheaters are suitable for LVL, PB, MDF, and OSB/OSL, requiring electrical energy and occupying 7-10 meters of space. They are easy to operate, with energy efficiency dependent on mat throughput. Steam preheaters, used for PB, MDF, and OSB/OSL, require steam supply and occupy 2.5-5 meters of space. They are more challenging to operate due to technological and moisture considerations, with energy efficiency dependent on throughput and mat density.

Catalog excerpts

05 | 2011 The idea behind preheating systems Advantages of preheaters compared to press extensions lower costs if press extensions require new foundations much shorter downtime for installation less space requirements reduced production costs / m³ because of capacity increase applicable for all kind of pressing systems more flexibility of thickness and density of the product page 2

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05 | 2011 Key formula for preheating systems 1 C = 1% 1 C higher mat temperature = 1% production increase in the press page 3

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05 | 2011 Function: Microwave and steam preheating Conventional press heat transfer and moisture transfer: thickness mat mat press steel belt Steam preheater heat transfer and moisture transfer: (Adding moisture) steam 100 C 100 C temperature press total + Microwave preheater heat transfer and moisture transfer: (Shifting existing moisture) press microwave ~ 60 C total + page 4

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Function: Temperature flow - heating platen, mat CPS heating platen temperature at a 25 mm board high pressure area medium pressure area Press time [%] -with preheating Press time [%]

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05 | 2011 References for steam preheater 6 lines installed PB - 2 MDF - 1 OSB – 1 CSS – 2 Achieved capacity increase on a PB line: Final thickness [mm] Density [kg/m³] Pressfactor without preheater [s/mm] Pressfactor with preheater [s/mm] Capacity Increase [%] 12 700 4,8 4,6 4 18 660 4,3 3,3 25 28 630 5,3 3,9 27 38 610 6,3 4,5 28 page 6

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05 | 2011 References for microwave preheater 7 lines installed PB - 1 LVL - 6 Achieved capacity increase is independent on the thickness of mat about 30% by a temperature rising of approx. 30 K. page 7

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05 | 2011 Comparison: microwave and steam preheater microwave preheater: For LVL, PB, MDF, OSB/OSL Electrical energy necessary Space requirement approx. 7 – 10 m Easy to operate Energy efficiency is only dependent on the throughput of mat steam preheater: For PB, MDF and OSB/OSL Steam supply necessary Space requirement approx. 2,5 – 5 m Challenging operation (technology /moisture) Energy efficiency is dependent on throughput and density of mat page 8

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