Abstract: A door for sealing an aperture in a heated, pressurized chamber to prevent passage of gases through the aperture. A flexible door plate is sized to cover the aperture. A door frame is provided with frame members positionable around the circumference of one face of the door plate. Releasable fasteners are provided for releasably fastening the door plate and the door frame over the aperture to sandwich the door plate between the aperture and the door frame. A plurality of adjustable tightening members are disposed at intervals around the door frame for adjustably tightening the door frame against the door plate at each such interval.

Abstract: A bag inserter for inserting a liquid filled bag into a preselected position within a container. A funnel receives and guides the bag into the container. The funnel has a bag receiving aperture for guiding the bag into a tapered bag forming section. The bag passes into a bag discharge chute beneath the bag forming section and then through a bag discharge aperture formed at a substantial vertical angle across the lower end of the chute. Container positioning means are provided for positioning a container to receive the bag with a bag receiving aperture of the container adjacent the discharge aperture and with a wall of the container opposite the container bag receiving aperture at approximately the same angle at which the bag discharge aperture intersects the bag discharge chute.

Abstract: Overlaid plywood is made by filling surface defects on a plywood panel with a thermosetting resin; overlaying the filled surface(s) with sheet(s) of overlay paper and then compressing the panel, while heating the panel. Gluelines in the plywood veneer and in the overlay paper(s) are cured during the hot pressing operation, which also flattens and hardens the resin-filled defects to form a smooth-surfaced overlaid plywood panel.