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Efficient Drying Process for UF/MF Products with Type S Dryers

This document outlines the drying profiles for Type S dryers designed for UF/MF products, focusing on maintaining optimal moisture content during processing at speeds of 45 m/min. It details the temperature zones ranging from 100°C to 220°C and air speeds of 12 to 22 m/s, with structured sections aimed at achieving uniform drying. The benefits include contactless drying, reduced surface defects, and variable heat transfer. It also discusses moisture extraction crucial for product quality and prevention of surface damage by maintaining the right drying conditions.

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Efficient Drying Process for UF/MF Products with Type S Dryers

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  1. 0 Dryer Length in M 11.25 7.5 3.75 Dryer Type "S" Typical Drying Profile for 80 gsm UF/MF Product @ 45m/min T = 140 °C T = 160 °C T = 170 °C V = 22 m/s V = 18 m/s V = 15 m/s • Typically 3 Sections á 3.75 m • Zone Temperature Range100 to 220 °C • Air Speed at Nozzle 12 to 22 m/s

  2. °C % 60 120 50 100 40 80 30 60 20 40 10 20 T = 170 °C T = 160 °C T = 140 °C V = 18 m/s V = 15 m/s V = 22 m/s 0 Dryer Length in M 11.25 7.5 3.75 Dryer Type "S" Typical Drying Profile for 80 gsm UF/MF Product @ 45m/min Web Temperature 110 - 120°C Moisture Content 12 - 14% • Exit Moisture (Volatiles) 10 to 16 % • Web Temperature Rise 20 to 120 °C

  3. Dryer I Type "S" • Avoids • Edge Flatter • Paper Wrinkles • Surface Defects • Gives • Contactless Drying • Uniform Moisture Content • Variable heat transfer • Fast Start Up

  4. Mini Cooling Section Meyerbar & Smoothing Roll Stand Gravure Rolls Intermediate Section

  5. Mini Cooling Zone • Floatation Nozzles • Lowers Web Temperatureprior to coating • Supports Web for 1 StageOperation

  6. Gravure Roll Coater • For Two Stage OperationLP Decorative Papers • Fixed MF Coating WeightIrrespective of raw paper coating • Independent to web tension • Gravure Rolls with defined “Nip” Size • Thousands of “Nips” over width of roll • Wet Coating 20 to 30 gsm on each Side varied by roll speed to paper

  7. Meyerbar & Smoothing Rolls • 2 Meyerbar rolls spread out coating ”Tyre Print” caused by gravure roll “Nips” over web width • 2 Smoothing Rolls Polish Product Surface Prior to Dryer II • Unit can be moved apart for cleaning & Gravure roll exchange

  8. Intermediate Section

  9. Dryer II Type "S" • Drives out moisture from core resin • Carries on the UF/MF core resin part curing • Drives out moisture from MF Surface Resin coating • Starts MF Resin part curing • Reduces moisture (volatiles) down to required final volatile content:5.8 to 6.5 % • Same dryer design as for stage I

  10. 0 22.5 15.0 11.25 3.75 7.5 18.75 Dryer Length in M Dryer II Type "S" Typical Drying Profile for 80 gsm UF/MF Product @ 45m/min T = 140 °C T = 150 °C T = 160 °C T = 150 °C T = 140 °C T = 130 °C V = 15 m/s V = 15 m/s V = 15 m/s V = 18 m/s V = 18 m/s V = 18 m/s • Zone Temperature Range100 to 220 °C • Air Speed at Nozzle 12 to 22 m/s • Typically 6 Sections á 3.75 m

  11. °C % 60 120 50 100 40 80 30 60 20 40 10 20 T = 140 °C T = 150 °C T = 160 °C T = 150 °C T = 140 °C T = 130 °C V = 15 m/s V = 15 m/s V = 15 m/s V = 18 m/s V = 18 m/s V = 18 m/s 0 22.5 15.0 11.25 7.5 18.75 3.75 Dryer Length in M Dryer II Type "S" Typical Drying Profile for 80 gsm UF/MF Product @ 45m/min Web Temperature 110 - 120°C Moisture Content 5.8 - 6.5% • Exit Moisture (Volatiles) 5.8 to 6.5% • Web Temperature Rise 20 to 120 °C

  12. Dryer II Type "S" • Too Aggressive Drying • Damage Surfacepin holescracks • Increased melamine Dusting • High Static Electricitycharging • High Formaldehyde emissions

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