Patents Assigned to Heinrich Buhnen KG
  • Applicator for hot-melt adhesive
    Patent number: 4601597
    Abstract: A hot-melt adhesive applicator with a heating block features a flow maze for the hot-melt adhesive, arranged between heating block and applicator nozzle, which is formed, for one, by parts of the heating block, and, for another, by a detachable maze attachment, and causes the hot-melt adhesive to flow through thin ribbon or disk-shaped spaces in intimate contact with heated surfaces, with all essential adhesive channels being easily accessible for cleaning upon removal of the maze attachment.
    Type: Grant
    Filed: May 10, 1984
    Date of Patent: July 22, 1986
    Assignee: Heinrich Buhnen KG
    Inventors: Wilhelm Bertram, Alfred Bottcher, Carl Siegmann
  • Relief pressure valve for hot melt adhesive
    Patent number: 4124163
    Abstract: A valve for hot melt adhesives is provided with a spring pressed piston urged open by adhesive pressure. A nozzle on the valve has an outlet channel of predetermined volume. Upon termination of fluid pressure the piston retracts through a volume less than the predetermined nozzle outlet channel volume to suck back a limited amount of adhesive to prevent dripping of adhesives.
    Type: Grant
    Filed: April 1, 1977
    Date of Patent: November 7, 1978
    Assignee: Firma Heinrich Buhnen KG
    Inventor: Carl Siegmann