A Smoothing Press, Schaefer model SP, is a rotary lamination press (nip rolls) used to squeeze an adhesive coated sheet to a substrate. It is designed for laminating labels or sheets of material to substrates such as corrugated, chipboard and foam core board.
This rotary laminating press has a fixed lower roller and a floating upper pinch roll. The pinch roll is designed to provide enough pressure to squeeze out bubbles, blisters, and wrinkles trapped between the substrates, giving a high quality lamination. The nip pressure between the rolls is created by the weight of the pinch roller, and is about 2 lbs per linear inch. The pressure between the nip rolls is sufficient to squeeze air bubbles out of the layers of the lamination, but does not exert excessive pressure that would crush the flutes on corrugated or collapse foamcore board.
The floating pinch roll can follow variations in substrate thickness while maintaining consistent nip roll pressure. Both nip rolls are powered to provide positive pulling force and to eliminate any slippage between the layers of the lamination. The nip rolls are covered with urethane rubber for a positive grip and to conform to surface imperfections in the lamination substrates. Rolls can be separated for cleaning or shutdown periods. Initial opening between the rolls is adjustable.
The smoothing press is powered by a D.C. variable speed drive. Top speed is approximately 60 feet per minute, but it can also be operated at lower speeds to match the output of adjoining machinery.
Four versions of the smoothing press are available, with different maximum openings between the nip rolls. These are the standard SP, the SP3, the ACP, and the SPL. Details on each of these are on the adjoining pages.
• Durable urethane covered rollers – 45 – 50 “A”
• Both rolls driven to eliminate slippage of parts
• Variable speed DC drive
• Adjustable initial opening between rolls
• Floating pinch roll eliminates compression of
• Lamination of materials up to 1 ¼” thick
• Powder coated finish
• Substrate for lamination is placed on the in-feed table
• Front edge of glued sheet is set in place on substrate
• Combined sheets are moved forward until the rolls
• pinch them
• Rollers pull sheets through do laminating at the
• same time
• Weight of the pinch roll will squeeze out wrinkles,
• blisters and bubbles
The smoothing press can be modified for many different types of laminating work. Some of the options and special designs available:
• Welded stands with locking casters
• Metal rolls
• Silicone rubber or other types of roller surfaces
• Rolls with special hardness coverings
• Larger openings
• Custom widths
• Air cylinders for added squeeze pressure
• Larger motors available for use as pull rolls
• Special voltages
• Alternate motor locations
• Spring loading for pinch roll
• Digital roll height indicators