Davis-standard Corporation

Gloucester Engineering Co., Inc.

Chad Allen Biron

John P Christiano

Saulius Tomas Eiva

Michael Andrews

Joseph A Wnuk

Alexandre MacGregor

William Ellery Jones

Christopher Rosivach

Bruce Michael O'Connor

Tyler Robert McKenna

William Welsh Bode

Mark Dean Steele

T Eiva Saulius

A tube forming apparatus for forming polymeric tubing includes a housing between rear and discharge ends. The tube forming apparatus includes a core tube assembly with an exterior core tube and an inner core tube positioned partially therein and in an interior area of the housing. The tube forming apparatus includes a die that has an inner die-surface. A diverter tip is mounted in and extends from the inner core tube into the die forming a die opening between the die and the diverter tip. The tube forming apparatus includes a core tube adjustment system mounted proximate the rear end which includes an axial displacement device configured to axially position the core tube assembly for modulating wall thickness of the tube and/or an angular displacement device configured to modulate the inner core tube for modulating concentricity of the tube.

Polymeric tube forming apparatus with a multi-dimensional control system

An annular die has a mandrel having a spiral groove formed in a surface of the mandrel that distributes a flow of liquid across the mandrel surface and directs the flow of liquid in a flow direction across the spiral groove and across the mandrel surface. At least a portion of the spiral groove has a cross-section configuration where an interior surface of the spiral groove portion is oriented toward the flow direction as the interior surface extends to and intersects with the mandrel surface. The annular die has particular, but not limited, application as a blown film die.

Annular die spiral groove configuration

Growing community of inventors

Gloucester, MA, United States of America

Chad Allen Biron