Static Mixers outlets: Stepped, Tapered, or Luer Lock

October 29, 2015 | Category: Blog

In this last post on what resin mixing nozzles are, we spelled out the difference between laminar and turbulent flow. Static mixers of all sorts are known in the engineering world (a scary place, if you’ve ever been there) in terms of laminar flow, which, if we remember, is consistent throughout.  Turbulent is characterized by chaotic flow with irregular changes in both material speed and direction.


“Do you know what a disposable static mixer is?”  Because you get asked this question all of the time, now you have something to respond: a static mixer is designed to achieve laminar flow at a specific ratio of catalyst and polymer, which is typically 1:1.  However mix ratios go up to 10:1 in many cases.

But to make a viscous liquid flow this way or that is not all that a static mixer does.  And to transform turbulent into laminar flow is not all a static mixer is. It is so much more than that!

Again, though, under discussion is a disposable motionless plastic mixer.  The “disposable” bit is important, for there are aspects of a disposable resin mixing nozzle that a “regular” static mixer doesn’t have.  If you expect to have an intelligent conversation about a helical static mixer, you’ll have to learn to talk the “tip” of the mixtip.  Now while fortunately for you, no one in the adhesives industry talks that way, “mixtip” can be a popular nickname for static mixers, since the tip is such an important part.

Static mixer tips differ in order to meet different dispensing purposes.  Commonly, there are three different types: stepped, tapered (or slip luer), and luer lock.

Disposable static mixers with stepped tips have an evenly distributed, graduated striation in order to give you the option of optimizing the size of the bead of whatever mixture comes out of the tip.  This is called your “adhesive bead” size.   Stepped tips need neither an adapter nor a needle to adjust the bead’s size, you simply just cut the mixer. Likewise, if you require highly controlled dispensing conditions, that is, a tiny bead of fine quality, there is a better static mixer discharge option for you.


Similar to their stepped cousins, tapered tips or slip luer are also not designed to be cut, but they can accept tips that spread a precise bead of, say, 1/4 inch or even two small lines of adhesive on a part to be assembled.  If you’re looking for your standard, run-of-the-mill size bead, have a tight location to get into where steps might hang up, or even  occasionally put on an adapter, a tapered or slip luer tip is the way to go.


Now, Luer Lock tips give you the added capacity to hook up or rather lock on (hence the “lock” in luer lock) needles or tips for adhesive dispensing of the utmost care and precision, for a tiny bead of just the right amount.




The Luer Lock adapter, which is the white contraption inserted into a truncated stepped tip mixtip, makes it possible to customize the mixing nozzle for whatever application your heart truly desires.  As though being called up by a friend for a night on the town, Luer Lock equipped two-part epoxy or polyurethane static mixers call for you to “accessorize”: whip hoses, needles, and tapered tip needles oh my!  These attachments provide a more delicate point of contact between the mixtip and its object of application or, in the case of whip hoses, greater dexterity at the dispensing tip.  If not only accuracy but precision is what concerns you, choose the Luer Lock.

Don’t forget, BTmix sells and manufactures all three types of disposable static mixers.  Whatever sort of tip you’re after, you can find it at the lowest price at BTmix–high quality, cheap disposable mixing nozzles that are no different from the name brands you already buy or are thinking of buying.  At the very least, give us a call and talk tips with us. We’ll shoot you some free plastic static mixer samples. Buy disposable static mixers from us!