Transfer molding cold runner

FIGURE 1.250 Principle of a transfer molding cold runner... 

Examples of molding circuits and automation circuits Mold Desi0n and Maintenance for Dia fnostics (20 hour Module) Design considerations Mold design basics Cavity and core construction Heat transfer considerations Cold runner molds Hot runner systems Freeing mechanism/part ejection Mold maintenance... 

However, if the upper mold plate and upper part of the middle section are maintained at temperatures well below what would initiate crosslinking, the residual cake can be integrated in the following cycle (cold runner transfer mold). 

Initially, runs were performed at injection velocities ranging fi om 150 nnn/sec (76.0 ccm/sec) down to 25 mm/sec (12.7 ccm/sec) using a standard cold runner mold that made ASTM test specimens. The barrel temperatures followed the 295°C profile provided in Table 1. During injection the screw traveled 50 mm (25.3 ccm) and the transfer position was adjusted slightly to maintain a 23 mm cushion and acceptable parts. It was determined by color tracing that it took three cycles for plastic to travel fi-om the feed zone into the forming shot. 

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