| 摘要 |
<p>A lenticular pattern forming roll (44), used for forming a lenticular screen, includes a chill roll (44a) and a lenticular sleeve (44b) positioned on the chill roll, and may be readily used in combination with an extruder (41) for extruding a plastic sheet (46). The sleeve has a lenticular pattern formed on an outer surface for forming a corresponding lenticular pattern in the plastic sheet. The sleeve may be readily manufactured and transported to a desired location to be installed on the chill roll, and may also be removed from the chill roll and transported for resurfacing and without requiring transporting of the chill roll. The lenticular sleeve may preferably comprise an amorphous nickel-phosphorous composition defining at least a radially outermost portion of the sleeve in which the lenticular pattern is formed, preferably 75 top 86 percent by weight of nickel and 14 to 35 percent by weight phosphorus, and may be formed by electrodepositing or electroless depositing. The sleeve may be slit and flattened to define a flat lenticular body for molding a lenticular screen.</p> |
