Patent ID: 6017209
Filing Date: 2000-01-25
Classification: B29C,B29L

Abstract:
In an injection molding one-piece gate and cavity insert (10) to be mounted in a mold (12) between a heated nozzle (14) and a cavity (16), the gate and cavity insert (10) having a rear surface (30) with a recessed portion (40) which receives the nozzle (14), a front surface (32) which provides at least a portion of a rear surface (78) of the cavity (16), a gate (34) extending centrally therethrough from the rear surface (30) to the front surface (32) to convey melt from the nozzle (14) to the cavity (16), and an outer surface (28) with at least one cooling fluid inlet and at least one cooling fluid outlet extending inwardly therefrom, the gate and cavity insert (10) also having at least one cooling fluid flow passage extending therethrough from the cooling fluid inlet to the cooling fluid outlet, the improvement wherein;said gate and cavity insert (10) is formed of an inner gate portion (86) and an outer cavity portion (88) metallurgically bonded together, the outer cavity portion (88) forms a portion of the surface (78) of the cavity (16), the at least one cooling fluid flow passage in the gate and cavity insert (10) alternately extends both forwardly and rearwardly and inwardly and outwardly, and the at least one cooling fluid flow passage extends only through the outer cavity portion (88).