Accumulator head for producing a storage drum with view stripe

Claim 1

In an accumulator head for a blow molding machine for extruding a tube of plastic material wherein said head includes a mandrel, a die body enclosing said mandrel to define therewith an annular outlet orifice, a first inlet orifice, an annular accumulation chamber in communication with and located between said inlet and outlet orifices, and an annular piston movable in said accumulation chamber so as to discharge accumulated first plastic material therein through said outlet orifice, means operatively associated with said mandrel and said die body between said accumulation chamber and said outlet orifice to form a radially extending split in said first plastic material as said first plastic material is discharged through said outlet, a second inlet orifice for injection of a second plastic material into said split in the flow stream of said first plastic material as said first plastic material exits through said outlet orifice whereby the total extruded plastic flowing out of the annular outlet orifice forms a tube having a strip of said second plastic material in said tube extending longitudinally thereof.