| 摘要 |
<p>An injection molding apparatus having a sealing arrangement between a hot runner manifold and edge-gated nozzle that accommodates thermal expansion during operation is disclosed. A spacer (104) element is axially fixed in position between the manifold (106) and a mold plate (108) in which the nozzle (102) sits. The nozzle (102) includes a reduced diameter spigot portion (112) on an upstream end that is in a telescopic/slidable relationship with a bore (220) of the spacer element (104). The nozzle (102) includes radially extended nozzle tips (116) axially fixed in position at a downstream end of the nozzle (102) that are in fluid communication with respective mold gates and corresponding mold cavities. In the cold condition, a gap G exists between a shoulder of the nozzle proximate the spigot portion (112) and a corresponding surface of the spacer element bore (220). Under operating conditions, thermal expansion of the nozzle (102) is accommodated in a direction of the manifold (106) by the gap.</p> |
