Method of making a low density frothed mineral wool

Details Method of making a low density frothed mineral wool Method of making a low density frothed mineral wool

1989-08-04

1991-05-07

Theisen, Mary Lynn

Paper making and fiber liberation

Processes and products

Pore forming in situ

162145, 162152, 162202, 162208, 162217, D21J 100, D21J 120

Patent

active

050134051

ABSTRACT:
A method for the manufacture of very low density mineral wool structural panels on a moving foraminous support wire by frothing a dilute aqueous dispersion of mineral wool is disclosed. The forth, a mass of delicate, non-resilient and non-uniform bubbles among the entangled mineral wool fibers readily breaks, is stripped of water and dried without substantial loss of the highly open, porous structural configuration by a first controlled rate of maturation dewatering followed by brief pulses of high vacuum. Then the open structure is rapidly stripped of remaining water and dried by passing high volumes of heated dry air through the structure with continued vacuum. The drainage water may be recycled in the process to maintain a low level of binder and any frothing aid additions.

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