FeedThroat Temperature Control Plastics Technology
To understand the formation of the ball of plastic in the feed throat we need to review a few aspects of screw design and melt theory. Assuming you use a socalled generalpurpose screw with a 20:1 L/D you have a screw with 10 flights of feed section five flights of transition and five flights of metering.
INJECTION MOLDING: Troubleshooting Bridging Plastics Technology
Bottom line if your feed throat is operating below 150 F 65 C I would not lower the feedthroat temperature for most resins. The feed throat needs to run warm to work properly as a vent. Few resins get tacky anywhere near 150 F. I recommend that the feed throat be PID temperature controlled just like the other zones on the barrel.
Identifying and Correcting Splay Plastics Technology
At startup drain 25 lb of material from the loading system at the feedthroat drain. This will ensure that material loaded has been retrieved in a dry state. Mold leaks. A water fitting is leaking or an internal water leak is present within the mold. Investigate the mold for signs that a water leak is present and correct the condition.
Processing guidelines for injection molding of thermoplastic
heat exchanger feed throat mold and other machine areas. Quick process startup The following procedure works well for any velocitycontrolled injectionmolding machine. The following conditions although generally applicable are not necessarily optimum for a specific appli ion. 1. Set pack and hold timers to 0. 2. Set pack and hold
INJECTION MOLDING: Get Control Over Barrel Zone Temperature
Higherend extruders and some molding machines have cooling between the heater bands to help control temperature. The bottom line is that there are times when the screwrecovery melting process generates too much energy and it shows up as zonetemperature override.
The feed throat temperature in injection molding process
Tags: Injection Molding Process. In general most feed throat temps are from 95 deg f to no more than 130 deg f . And if you stay within those temperatures it will not bother the drying of the material. We run radel which its melt temperatures go up 640 deg f and we ran the feed throat at 120 deg f . There are some injection machines that
Overheating issues InjectionMoldingOnline.com
Is there a possibility the coils are clogged This is the only machine over heating with the oil problem. 2 . I have a Van Dorn ET80. The rear zone No Matter what I set it at it goes to 500520F. I can set it at 32 and it goes to 500. i wouldn 39t be worried But this causes melted material building up in the feed throat. Any ideas Thanks guys
Injection Molding Hansen Plastics Corporation
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Plastics Machinery Horizontal Injection Molding Machines
Hands or limbs caught in machine while loosening trapped materials at feed throat. Slips trips and falls at material feed lo ion. Possible Solutions: The injection unit and other accessible parts posing thermal hazards should be insulated or guarded. Place warning signs where hot parts are necessarily exposed.