DESCRIPTION OF PROBLEM: A hot runner mold is used to produce a large part out of nylon 6-6 with a problem of un-melts causing the orifice of the hot tip to block and produce short shots and surface imperfections.
MACHINE DATA
MAKE: Cincinnati Vista
MODEL: VT 600
SCREW: 80mm
SCREW L/D: 20:1
RATED SHOT SIZE: 1701 grams.
PROCESS SETUP: BEFORE
SHOT SIZE : 1105.64 grams
RPM : 100
BACK PRESSURE: 10.34 bars.
RECOVERY RATE: 22.85 gr./rev.
CYCLE TIME: 60 sec.
MELT TEMP.: 288 C
PRODUCT SOLUTION: A multi-purpose Posi-Melt TM PATENT PENDING design eliminated the un-melts in the melt pool while lowering the melt temperature, RPM and backpressure. The lower melt temperature eliminated the heat induced splay and imperfections.
ECONOMIC GAIN: Reduction in scrap due to short shots and splay. Lower RPM and reduced backpressure reduces the likelihood of equipment failure and need for replacement
and downtime.
