St. Regis 90E Pinch Bottom Field Closer Bag Sealer, 1974 – Designed to re-melt the hot melt adhesive applied to the stepped end of open mouth pinch bottom bags and then seal the top closed – All stainless steel, single-inlet reactivation assembly and heater tube support – Air pressure requirements: 7 PSI for normal option – Recommended conveyance speed of 35 feet per minute – Depth of bag top fold: recommended depth of 1 and 5/8th inches, + or – 1/4 inch (1 3/8″ to 1 7/8″)