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    • 67. 发明申请
    • Ribbed core multi-wall structure
    • US20080057249A1
    • 2008-03-06
    • US11978311
    • 2007-10-29
    • F. John Herrington
    • F. John Herrington
    • B29C53/14
    • B29C53/14B29C48/001B29C48/09B29C48/11B29C48/12B29C48/13B29C48/21B29C48/355B29L2023/22B29L2024/006F16L9/18Y10T428/1393
    • A multi-wall, seamless, helical tubular structure comprising, as a single seamless entity, an inner cylindrical element, an outer tubular element spaced radially from the inner cylindrical element; and a plurality of rib elements seamlessly contiguous with said inner and outer elements and in supporting relationship to said inner and outer elements; wherein the structure as a whole and all of the elements thereof are substantially helical in configuration. At least some of the next adjacent rib elements are disposed normal to said inner cylindrical and outer tubular elements whereby, in combination with the intercepted portions of said inner and outer elements, forming generally trapezoidal helical truss cells. One important use of these helical products is as cores for rolled goods such as plastic film or sheeting. An apparatus for producing such a helical tubular structure as a seamless helical entity comprising a rotatable extrusion die assembly comprising an outer rotatable arcuate die portion that corresponds to said outer tubular element, an inner rotatable arcuate die portion that corresponds to said inner cylindrical element and a plurality of rotatable die portions that correspond to said rib elements and communicate with both said inner and outer die portions wherein all of said die elements are adapted to operate together to rotate simultaneously whereby enabling the formation of a unitary, seamless helical extrudate structure configured as aforesaid. The apparatus further comprises means for extruding the helical extrudate formed of moldable plastic through said extrusion die assembly and moving the extrudate in a downstream direction. Still further, the apparatus comprises cooling means operatively associated with said extrudate adapted to cool and solidify said extrudate in said helical configuration. A method of forming the referenced unitary helical structure comprises feeding a molten stream of a moldable plastic through a rotating extrusion die assembly while rotating the extrusion die assembly as a whole to thereby configure the emerging stream of molten plastic as a seamless, unitary, helical tubular extrudate. The helical extrudate is cooled an amount sufficient to freeze and solidify the same whereby freezing the helical structure into the solidified extrudate.