2738 



PRESSING SIS HARDBOARD 2810 



Press lines 2810 



Press cycle 2812 



Pressing to stops 2814 



Thickness tolerance 2814 



Density profile 2814 



23-9 DRY-PROCESS FIBERBOARD MANUFACTURING .... 2817 



OVERVIEW 2817 



Limitations of dry -process thin boards 2819 



Advantages of dry-process thin boards 2819 



HIGH- AND MEDIUM-DENSITY HARDBOARDS .... 2824 



Drying 2824 



Forming 2826 



Pressing 2831 



Process (density) control 2832 



MEDIUM-DENSITY FIBERBOARD 2834 



Drying y resin binder application y and forming 2839 



Pressing 2841 



CONTINUOUS MENDE PROCESS 2847 



BOARDS WITH ORIENTED FIBERS 2850 



23-10 HEAT TREATMENT, TEMPERING, 



AND HUMIDIFICATION 2851 



IMPROVEMENT OF BOARD PROPERTIES 2852 



Dimensional stabilization 2852 



Improvement of strength properties 2857 



INDUSTRIAL PRACTICES 2859 



Tempering 2859 



Heat treating 2861 



Humidification 2863 



23-11 FABRICATING AND FINISHING 2864 



INSULATION BOARD FABRICATING 



AND FINISHING 2864 



Embossing 2867 



HARDBOARD FABRICATING 2867 



Sanding 2867 



Trimming 2867 



Punching 2868 



Face embossing 2868 



Molding 2869 



HARDBOARD FINISHING 2869 



Finishing materials 2869 



Interior wall paneling and decorative board 2870 



Siding 2874 



Vinyl and paper overlays 2874 



