Davis-Standard, USA recently designed an innovative cast film system for synthetic paper production. New to the cast film industry, the system consists of an adaptation of Davis-Standard’s “dry” embossing unit, a coextrusion extruder arrangement and bi-directional winder. It is capable of producing finished film with widths of 2, 2.4 and 2.8 meters, and with a variety of surface properties.
The focal point of the system is the “dry” embossing unit, which is used to control the surface properties of the film. The unit can produce films with matte/matte, matte/gloss, gloss/matte and gloss/gloss finishes, and is designed to quench and anneal the film to promote crystalline growth and dimensional stability.
The coextrusion complex features Davis-Standard’s well-known DSB® I barrier screws, which are ideal for synthetic paper extrusion because of excellent distributive and dispersive properties. Synthetic paper blends contain large amounts of additives and rely on the screw to effectively formulate stress as the driving force to break down the blend’s agglomerated components. The result is an extruded film that is uniform in color and void of striations that cause the film to distort, or curl over time. Due to the abrasive nature of the additives, the system is also constructed of the hardest materials available to prevent premature wear of components.
The winder is designed for in-line slitting to produce multiple rolls of film down to 6-inches (150 mm) in width. It can wind in either direction, and “CD” quality rolls can be produced up to 40-inches (1000 mm) in diameter.
Control options for the system include the CMR 2000 microprocessor or Davis-Standard’s EPIC supervisory control system. An in-line MDO unit is available to further improve the tensile properties of the film making it more suitable for paper substitution. Additionally, the system can be equipped with the pre-wired, pre-piped “Top Cast” arrangement, or the “Bi-Trac” unit for producing both synthetic paper or flat cast films.
For more information about the synthetic film line, contact Steve Post, Business Area Manager of Davis-Standard’s Cast Film Systems, at (908) 722-6000, ext. 2407.