Davis-Standard Corp. said its second-generation DS series channel accumulator head for blow molding features an improved core tube and new plunger technology.
The polymer flow is directed into two spiral channels that wrap 720 degrees around the core tube as it tapers. That allows the plastic to flow down the head to layer the material, eliminating knit lines. The core tube is chrome-plated, for better abrasion resistance and flow, enabling faster changes of material and color, according to the company.
Three cylinders are used to push out parisons. The cylinders can be replaced without taking apart the head.
In reclaim extruder news, Davis-Standard has developed a new version of its Scrapper dual-diameter extruder, making it handle foam better.
The Pawcatuck, Conn.-based company created a new feed angle and added grooves within the feed section, so the Scrapper more efficiently processes foam products such as meat trays, cups, plates and insulation board.
Also, the angle of transition between the large- and small-diameter sections of the screw and barrel has been customized for foam. Because the barrel abruptly squeezes down after the feed section, the smaller-diameter section densifies the material.
The Scrapper also processes film, bags, fiber and other scrap with low bulk density.
Tel. (860) 599-1010, fax (860) 599-6258, e-mail rfr[email protected] davis-standard.com.