Internal Air Support
On Line Controls, Inc. has been the leading manufacturer of internal air pressure regulators for medical tubing for almost 40 years. As medical tubing has gotten smaller and now has numerous lumens, our MicroAir has been updated internally to keep the air pressure constant and precise even at ranges below 1" of water. When free extruding a tube, the internal air is critical to maintaining precsion diameter control.
“MicroAir” ultra low air pressure
regulators and controllers are the industry standard for controlling the
internal air pressure to maintain the inside diameter and wall thickness during
tubing extrusion. During the free extrusion process, we can maintain the tubing’s
shape, size, and ovality, prevent a collapse of the tube, and achieve the
correct diameter — holding the set point even when a cut is made or being
spooled. Three models are available: MicroAir I, the manual model; MicroAir II,
which accepts contact closures; and the MicroAir IV, which accepts zero to 10-volt
inputs for making bump or taper tubing or connecting to the line control
Profile and Medical Tubing manufacturers worldwide use our lower range units, 0-2”, 0-3”, 0-5”, 0-10”, 0-15”, and 0-30” of water, when extruding catheters, microtube, multilumen, single lumen, balloon, taper, micro-extruded tubing, coextruded tubes, and profiles. Our Dual and MultiAir units can provide each lumen of a multilumen tubing with its own air supply. Using our MultiAir units, we have customers making tubing with over 20-30 lumens. Our higher ranges of pressure, 0 - 3 psi and 0-5 psi are generally used to make plastic automotive tubing.
In the past few years, we have redesigned the internal components and circuitry to regulate the air pressure with greater precision, stability, and accuracy, even below 1 inch of water. The external look and ease of use of our models have not changed. Many companies making medical...
In the past few years, we have redesigned the internal components and circuitry to regulate the air pressure with greater precision, stability, and accuracy, even below 1 inch of water. The external look and ease of use of our models have not changed. Many companies making medical tubing use our MicroAir for air support inside the smallest tubes, while sometimes using vacuum outside to keep the ID, OD, and wall measurements. Some MicroAir units that are 15 to 20 years old are still in use on tubing lines, but new units have much greater precision and stability.
Bob Bessemer of Novatec says; “When free extruding a tube, the internal air is critical to maintaining precision diameter control. Always advise processors to use as little air as possible as air is compressible and thus can cause diameter fluctuation. If more the 1” is needed I always recommend the die should be changed to enhance precision and ease of processing. Less internal air means that cutting and coiling will have less affect on dimensional control. The incoming air to the precision air regulator should have one or more air regulators and even a flow control to further minimize shop air variations potential to affect the precision air regulators. MicroAir regulators are by far the most common unit used for medical tubing processing with great industry acceptance. And, with the new low range units the regulation is extremely precise with great resolution capabilities.”
Options that can be added when ordering now include digital display (LED) on any of our units, offering the ability of the air pressure to be seen easily; output options for closed-loop control
(0-10-volt current or 4-20ma voltage); and a stand with wheels for moving from line to line if needed.
For more information, stop by our Booth #1528, email us at [email protected], or visit our website at www.onlinecontrols.com.
Published by On Line Controls, Inc. on Jan 31, 2020