초록 ▼

For the extrusion of a calibrated profile of a thermoplastic polymer onto articles, the polymer, which is melted in an extruder (17), is fed, via a heated pressure hose (22), to an extruder head guided by a robot (5) and, by means of said extruder head, extruded and deposited on the article. At the

For the extrusion of a calibrated profile of a thermoplastic polymer onto articles, the polymer, which is melted in an extruder (17), is fed, via a heated pressure hose (22), to an extruder head guided by a robot (5) and, by means of said extruder head, extruded and deposited on the article. At the end of each extrusion operation, the material flow to the extruder head is maintained and, by means of a change-over valve within the extruder head, redirected into an outlet orifice provided in the vicinity of the die orifice until the commencement of the subsequent extrusion operation. The redirected material flow emerges from a pipe connector (29) which is arranged on the extruder head and is coupled to a coupling piece (33). The material collected in this manner may be pelletized and fed back to the feed hopper (16) of the extruder (17).

대표청구항 ▼

A process for extruding a calibrated profile of a thermoplastic polymer onto an article positioned in a processing region of an automatic handling unit, comprising the steps of: feeding a melted polymer to a heated extruder head having an extrusion die; extruding the melted polymer from the extruder

A process for extruding a calibrated profile of a thermoplastic polymer onto an article positioned in a processing region of an automatic handling unit, comprising the steps of: feeding a melted polymer to a heated extruder head having an extrusion die; extruding the melted polymer from the extruder head while guiding the extruder head along a surface of the article; lifting the extruder head from the article after completion of said extruding step; and maintaining, without interruption, the feeding of the melted polymer to the extruder head during said lifting step and unit commencement of a subsequent second feeding step by discharging the melted polymer out of the extruder head via an outlet orifice other than said extrusion die, the pressure loss during discharge through said outlet orifice of said extruder head being substantially equal to the pressure loss during discharge through said extrusion die so that the melted polymer fed to the extruder head is substantially directed to said outlet orifice, said outlet orifice being provided in the extruder head and in the vicinity of the extrusion die. A device for extruding a calibrated profile of a thermoplastic polymer onto an article positioned in a processing region of an automatic handling unit, comprising: an extruder for extruding a melted polymer, said extruder including an extruder head having a heated extrusion die with an orifice and a heated pressure hose connecting said extruder to said extruder head for supplying the melted polymer to said extrusion die; and an automatic handling unit including a controller for guiding said extruder head along a surface of the article during extrusion of the melted polymer from the extrusion die, wherein said extruder head comprises: a) an outlet orifice other than said orifice of said extrusion die, and b) a change-over valve being movable in response to said controller and positionable for selectively directing the melted polymer to one of said extrusion die and said outlet orifice, the pressure loss during discharge through said outlet orifice of said extruder head being substantially equal to the pressure loss during discharge through said extrusion die so that the melted polymer fed to the extruder head is substantially directed to said outlet orifice.