Feed compression

Some presses are equipped with strain gauges at key points in the overall feed—compress—eject cycle. Thus, these measure compression and ejection forces. Tight specifications for punch lengths and weU-designed and prepared granulations have led to better control of variations in tablet weight. In fiiUy automated presses, weight variations are adjusted by computer. 

Feed compression process, 13 778-779 Feed enzymes, 10 310 Feedforward back-propagation networks, 6 68-69... 

Its capacity should be about 10 times greater than that of the nitrator, and it should be half filled with water. An inlet pipe feeds compressed air into the bottom of the tank and the air supply should be turned on simultaneously as the safety valve is opened to evacuate the nitrator. Another solution consists in simultaneously opening the nitrator and injecting a strong jet of cold water before the mass enters the drowning tank. 

It is increasingly recognized that a conventional screw consisting only of feed, compression, and metering sections often fails to homogenize the liquid satisfactorily. This is particularly important for ... 

With a standard screw, consisting of feed, compression, and metering sections, the exercisable process parameters are feed rate, rotor speed, and barrel temperature. This is known to be insufficient, and increasing attention is now aimed at screw modification to increase homogeneity tty improving mixing. 

The main component of the reciprocating screw injection molding machine. It may have various sizes, lengths, and compression ratios. It is used to feed, compress, melt, and meter the resin for injecting into the mold cavity. Basically divided into 3 major sections feed section, deep screw depths to convey the resin into the next screw s section transition section, gradually decreasing screw depths when resin is compressed, forced against the barrel s surface, and melts and... 

The screw consists of at least five distinct geometrical sections. The first three sections, feed, compression, and metering, are the same as on a conventional screw. After the metering section there is a rapid decompression followed by the extraction section, which, in turn, is followed by a rapid compression and a pump section. Two important functional requirements for good devolatilization are zero pressure in the polymer under the vent port and completely molten polymer under the vent port. 

It is preferable to have a three-zone screw evenly divided into feed, compression and metering zones. However, a higher percentage of feed zone length is required for smaller machines approximately same as the other zones together ... 

The screw has three zones—the feed, compression (or transition), and metering. The feed zone picks up the material from the hopper and feeds it at a pressure sufficient to assure proper functioning of the compression zone. Feed zone conveying is optimized by a deep screw channel and a helix angle appropriate for the coefficient of friction between the polymer and screw. A helix angle of 17.7 deg has been used for many plastics. The channel depth of the feed zone may be approximately three times that of the metering zone. ... 

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