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The Problem: MHR was recently involved in troubleshooting a RIM machine that was showing erratic flow rates on the ISO line. (It's always the ISO line, isn't it?). The machine is set up with a variable speed frequency drive that controls the motor speed, and hence the pump flowrate, based on the measured flowrate and the desired target flowrate. The actual flowrate was varying significantly due to the inaccurate readings from the flowmeter. The flowmeter in question was a gea

Calibrating two streams at a time offers major advantages, and many RIM manufacturers are not aware it is possible to calibrate with both streams running at the same time.

The Importance of Orifice Sizing Orifice sizing is vital for achieving the best mix quality of two-part polyurethane foam in a Reaction Injection Molding (RIM) operation. Several factors influence the overall injection pressure of your system, and the orifice is the final point before mixing takes place. Each polyurethane chemical supplier provides a datasheet detailing the ideal injection pressure for your specific chemistry. Other critical considerations include the chemica

Determining Pump Rotation can be confusing. This post examines how to confidently determine pump rotation for proper operation.

A Mix Head : The Heart of Polyurethane Processing Equipment A mix head is essentially the business end of a reaction injection molding (RIM) or polyurethane foam system. It is where two or more liquid chemicals meet, blend, and immediately head into a mold or spray nozzle. This process is crucial as it initiates the reaction and curing of the materials. 1. Purpose of the Mix Head The mix head serves several important functions: Precise Metering: It accurately measures the c

Mastering RIM (Reaction Injection Molding) mix heads is fundamental for getting the best results in your production processes. This guide...

Variable displacement piston pumps, particularly those made by Rexroth (such as A2VK, A7VK, and A2FK) and Rotary Power (C01, C04, C07,...