Patent ID: 6196820
Filing Date: 2001-03-06
Classification: B29C

Abstract:
A device for filtering a plastic casting substance in an injection molding machine having a plasticizing unit and a mold cavity, the plasticizing unit having a channel with an outlet, the device comprising: a nozzle arrangeable at the mold cavity; a connection line connecting the nozzle to the channel; a slide arranged in the connection line between the plasticizing unit and the nozzle, the slide having a receptacle for holding a filter element and being displaceable perpendicular to a principal axis of the connection line; a piston-shaped displacing unit having an axis parallel to the principal axis of the connection line, the piston-shaped displacing unit having a filter holder in which a fresh filter element is insertable; preheating means arranged in a region of the filter holder for preheating the fresh filter element, the slide being displaceable into a position in which the receptacle for the filter element corresponds with the piston-shaped displacing unit enabling the filter element to be ejected and the fresh filter element to be simultaneously inserted; a blocking member movably arranged in the connection line downstream of the filter element receptacle in a direction of travel of the plastic casting substance so as to selectively block and allow the casting substance to flow in the connection line; an off-injection receptacle positioned proximal to the blocking member; and a branch line arranged at the connection line so that in one position of the blocking member the plasticizing unit communicates with the off-injection receptacle via the branch line.