| 摘要 |
A shutter door assembly assembled primarily from extruded plastic components is provided. The shutter door assembly includes an outer rectangular frame surrounding a pivotally attached vaned panel door. Various side, top, and bottom legs of the frame and door are constructed of a hollow extruded plastic and are securely mounted together to form a rigid, durable shutter door. The resulting shutter door has the general look and feel of an actual wooden door. An after-former device for forming extruded tubes for use in the shutter assembly is also provided. The after-former system mounts to a standard circular extrusion head, and converts a circular tube of extrudant to a desired noncircular shape, such as a rectangular shape. The after-former has a conical conduit, with an entrance aperture having a circular shape for receiving the initial extrudant and an exit aperture having the desired noncircular cross-section. As the extrudant passes through the conical conduit, the extrudant is gradually transformed to the desired noncircular cross-section.
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