Apparatus for extruding and blow molding multicolored...

Details Apparatus for extruding and blow molding multicolored... Apparatus for extruding and blow molding multicolored...

2008-09-18

2010-02-16

Davis, Robert B (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

Extrusion shaping means

C425S380000, C425S382300, C425S462000

Reexamination Certificate

active

07661945

ABSTRACT:
Cylindrical extrusions having multiple colors, capable of serving as parisons for subsequent blow molding operation, are formed in an apparatus in which plastics of each color to be incorporated in the finished product are fed by separate extruders to an extruding head having a stack of cylindrical spools each formed with a number of apertures around their periphery. The apertures in each spool are interleaved with corresponding apertures in the other spool or spools. The interiors of the apertures are fed into a conduit which extends coaxially with the axes of each of the spools so that the outputted plastic has multicolored stripes along its length. In an embodiment in which the spool is rotated in timed relation to the feed from the extruders, the output is twisted along the central axis to form a “barber pole” stripe arrangement. In an alternate embodiment a programming plate is disposed beneath the output. The plate has apertures which align with certain of the feeds from the spool and block others, and the plate may be rotated between a number of alternating positions to provide extrusions with horizontal stripes or checkerboard patterns. By blow molding the resulting parisons, multicolored containers with interesting patterns may be produced.

REFERENCES:
patent: 2174779 (1939-10-01), Jean Delorme
patent: 3718413 (1973-02-01), Luraschi et al.
patent: 3778207 (1973-12-01), Luraschi et al.
patent: 6926858 (2005-08-01), Cree
patent: 2005/0006804 (2005-01-01), Hartman
patent: 2006/0038310 (2006-02-01), Lipson
patent: 2007/0141194 (2007-06-01), Rubbelke

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