Claims
- 1. A process for forming a highway delineator comprising
- (a) simultaneously extruding two parallel sheets of thermoplastic material each of which has:
- (i) two parallel longitudinal edges,
- (ii) the configuration in transverse cross section of an arc with wings,
- (iii) a reverse curvature in both of its longitudinal edges at the point where the arc meets the wing such that the two arcs diverge from one another, and
- (b) after extruding, pressing the longitudinal edges of the two sheets together before they cool below the material formable temperature.
- 2. A process for forming an elongated article which displays substantial resistance to distortion but can be repeatedly deformed by bending across its major axis in the plane of its minor axis comprising
- (a) simultaneously extruding two parallel sheets of thermoplastic material such that
- (i) each sheet is formed in the shape of an arc whose interior faces the interior of the other sheet, and
- (ii) each arc is bordered with two parallel longitudinal edges which are each connected to the central arc by a radius of curvature whose interior faces generally away from the other sheet, and
- (b) then after extruding, while the material is still hot enough to be soft, joining the sheets by pressing their longitudinal edges together.
Parent Case Info
This application is a continuation of application Ser. No. 652,788, filed Sept. 20, 1984, now U.S. Pat. No. 4,621,940.
US Referenced Citations (6)
Continuations (1)
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Number |
Date |
Country |
Parent |
652788 |
Sep 1984 |
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