Industry News

For glass-filled nylon injection molding, start with the exact PA grade and glass-fiber content. Nanhaiya lists quenched-and-tempered 38CrMoAlA injection screws for reinforced plastics containing up to 30% glass fiber, including PA-GF. Its product pages also describe nitriding and nickel-tungsten alloy reinforcement for wear-prone screw and barrel areas. Select the geometry and surface system against the real duty, then check the barrel bore and screw tip or check ring before accepting a replacement. My rule on the factory side is simple: a hardness value does not rescue an incorrect geometry, and a new screw does not rescue a leaking front end. Put all three interfaces on the drawing and all three behaviors in the trial plan.

Choose a mutant or abrupt injection molding screw as a starting point for crystalline or semi-crystalline materials that benefit from rapid compression and melting. Nanhaiya lists PE, PP, PA, POM and PTFE. Its mutant compression section occupies about 5% to 15% of total screw length. Choose a gradual screw as a starting point for amorphous or heat-sensitive materials that need a smoother transition. Nanhaiya lists rigid PVC, PS, PC, PSU and ABS. Its gradual compression section normally occupies 40% to 60% of total length, with about 50% described as typical. Confirm either choice with the actual grade, filler, moisture, shot use, recovery time, melt condition and molded-part acceptance.

Specify a PE or PP high-speed single screw by the real material, saleable output, product and die, screw surface speed, melt-temperature window, pressure, motor and gearbox duty, cooling capacity, wear environment and acceptance method. Do not buy from diameter and maximum rpm alone. Nanhaiya publishes nine single-screw models from NHY20 to NHY150, with output ranges from 3 to 1,300 kg/h and speed ranges from 10 to 150 rpm across the family. Its PE and PP high-speed product uses optimized screw geometry, a high-torque gearbox, special feed-slot barrels and wear-resistant alloy construction. Turn every project target into a stable test point using the named resin, die, quality window and electrical measurement boundary.

To specify a wear-resistant single screw, send the exact resin and grade, filler or fiber type and percentage, recycled content, contamination, feed form, moisture, MFR or MVR test condition, required output, screw speed, motor load, melt pressure, temperature, operating hours and the present wear map. Then select the surface by damage location. Nanhaiya offers 38CrMoAlA, SACM645, 42CrMo and forged-steel substrates, with deep ion nitriding, PTA protection on flight tops and sides, plus tungsten carbide and nickel-based surface options. The proposed screw must be checked with the mating barrel, because a new hard surface cannot correct an enlarged or misaligned bore.

To buy a plastic extruder gearbox, specify the motor power and rated speed, required screw-speed range, continuous and peak torque duty, screw quantity and rotation, material and output, operating hours, input and output shaft interfaces, mounting position, thrust load, lubrication, cooling and acceptance test. Motor power alone is not a gearbox specification. Two lines with the same motor can impose different torque, heat, shock, synchronization and bearing duties. The signed drawing should identify the motor-side shaft and screw-side shaft, their speeds, rotation directions, ratio, mounting datums and every connection needed for installation.

To buy an extruder barrel flange, send a controlled drawing that identifies the bore, outside diameter, thickness, locating register, bolt pattern, sealing face, material, surface treatment and mating parts. Add the actual temperature and pressure basis, extruder or die-head model, quantity and inspection requirements. Do not order a custom machine flange from the words "ANSI," "DIN," "JIS" or "PN16" alone. Those references can define a standard pipe flange only when the complete standard designation and service basis are stated. An extruder connection usually needs its own interface drawing, even when one side follows a recognized flange pattern.