Dispensing Mixing Nozzle

Product Overview

The dispensing mixing nozzle (also called a static mix nozzle, mixer tip, or mixing nozzle) is the consumable end of a two-component adhesive dispense system. It accepts the two individually metered streams from the dispense valve, performs the inline mix through a stack of 16 to 24 helical elements, and forms the final bead or shot at the orifice outlet. The unit is designed for single-shift or single-batch use and is replaced at the end of the run — the elimination of cleaning, purging, and cross-contamination is the central design driver, and it is the reason that two-component dispense lines in production environments are almost universally built around the disposable mixer concept.

Our dispensing nozzle line covers the three interface standards that dominate the global market: the 1/4 in. bayonet (also called the 7.5 mm bell-attachment system, used on Nordson 770-series, Fisnar, and most Chinese-brand dispense valves), the 3/8 in. bayonet (used on larger-volume Nordson and Henkel valves), and the luer-lock (used on medical, dental, and low-volume lab dispense). All three interfaces are dimensionally interchangeable with the major OEM products, so the ywmixing nozzle is a drop-in aftermarket consumable for installed dispense-valve populations without any tool-change or adapter requirement.

Inside the housing, the element stack is the same geometry as our precision static mixer (which is the reusable parent product), but with element count reduced to 16-24 (versus 24-32 in the reusable) to keep the post-mix tip volume small and the dispense pressure manageable on the downstream valve. The mixer's CoV performance remains ≤ 1% at 1:1 to 10:1 ratios — comparable to the reusable parent — because the element geometry is identical, just shorter.

The dispense tip itself is a separate precision-machined component, swaged or ultrasonically welded to the housing outlet. Three standard tip profiles cover 90% of the application space: the straight-cut cylindrical tip for general bead and dot dispense; the tapered tip for fine-needle dispense down to 0.3 mm orifice; and the Luer taper for medical and dental applications where a luer needle or cannula is attached by the user.

Design Features & Working Principle

The housing is injection-molded in one piece from medical-grade PP (Borealis BJ368MO or equivalent) or PA66 (DuPont Zytel 101L or equivalent), with a wall thickness of 1.2-1.5 mm. The mixing elements are injection-molded as a separate subassembly and then ultrasonically welded into the housing — this allows the element geometry to be molded to a tighter tolerance (the elements are 0.05 mm thick and the vane twist angle is held to ±2°) than would be possible in a single-shot mold. The result is a nozzle whose discharge CoV is within 0.2% of the OEM reference product, despite the absence of any metal or wear components.

The mixing elements are 4-vane helical form, with each element 2.5-3.5 mm long, twisted 180° over its length, and stacked alternating right-hand/left-hand rotation. The 16-element stack produces about 65,000 theoretical sub-streams at the discharge; the 24-element stack produces about 4 million. The difference matters mostly for high-ratio systems — at 1:1 and 4:1, the 16-element stack is sufficient; at 10:1 and above, the 24-element stack is recommended.

The interface is held in the dispense valve by a stainless-steel or PA66 retaining collar. The collar has two opposing tabs that slide into the valve's bell-attachment and then rotate 90° to lock. Removal is the reverse — rotate 90° back and pull. On the luer-lock variant, the housing carries a male luer taper that mates to a standard luer needle or cannula; the luer is held by a 6° tapered friction fit and a threaded collar.

Three design details that are not visible from the outside but matter in production: (1) the inlet port geometry is asymmetric on the high-ratio variants (10:1 and above), with the minor-component port offset toward the housing centerline so it enters the major stream as a thin annular sheet — this raises the local mixing intensity at the inlet and reduces the required element count; (2) the post-mix tip is short — typically 8-12 mm from the last element to the orifice — to keep the residence volume between mix point and dispense point below 0.3 mL, which is critical for fast-curing systems where any extra volume would waste material at end-of-shot; and (3) the outer surface of the housing is textured in the grip area, which makes the nozzle easy to handle with gloves during changeover.

Technical Specifications

Parameter	Value
Mixing Element Count	16 (standard) / 20 / 24 elements
Element Geometry	4-vane helical, 180° twist per element, alternating R-H / L-H
Housing Material	Polypropylene (PP) or Polyamide 6.6 (PA66); natural, white, or UV-opaque (black)
Retaining Collar Material	SS304 (standard) or PA66 (low-cost variant)
Housing Bore (Inside Element)	3.0 / 4.0 / 5.0 / 6.0 / 8.0 mm
Housing Length (16-elem, 5 mm bore)	62 mm nominal
Housing Length (24-elem, 5 mm bore)	92 mm nominal
Working Pressure (Continuous)	4 bar (PP) / 8 bar (PA66)
Burst Pressure (Min.)	12 bar (PP) / 24 bar (PA66)
Viscosity Range (Each Stream)	50 to 15,000 cP (PP) / 50-50,000 cP (PA66)
Mix Ratio Range	1:1 to 10:1 (standard); 1:1 to 50:1 (asymmetric high-ratio variant)
Discharge Coefficient of Variation	CoV ≤ 1% (24-element, 1:1 to 10:1, 1,000-15,000 cP)
CoV (Asymmetric, 10:1 to 50:1)	≤ 3% at 50:1
Residence Volume (16-elem, 4 mm bore)	0.7 mL nominal
Residence Volume (24-elem, 4 mm bore)	1.0 mL nominal
Post-Mix Tip Length	8-12 mm (short-tip variant: 4-6 mm)
Tip Orifice (Standard)	1.0 / 1.6 / 2.0 / 2.5 / 3.0 mm (custom 0.3-5.0 mm on request)
Tip Orifice (Luer)	Luer taper for needle/cannula attachment by user
Operating Temperature (PP)	0°C to +80°C (continuous); +95°C short term (≤ 15 min)
Operating Temperature (PA66)	-20°C to +150°C (dry); 0°C to +80°C in water/glycol
End Connection (Standard)	Bayonet 1/4 in. (7.5 mm bell); Bayonet 3/8 in.; Luer-lock
Compatible Valves	Nordson 770 / Sulzer Mixpac / PVA / Fisnar / generic 1/4 in. bell
Shelf Life (Sealed Pouch)	24 months (PP) / 18 months (PA66) at 5-25°C, < 60% RH
Packaging	50 or 100 pieces per nitrogen-purged foil pouch, with desiccant
Biocompatibility (Medical Variant)	USP <87> Class VI (PP only), ISO 10993-5

Tip Selection Guide

Tip selection is driven by four parameters: the target shot size, the dispense pressure available from the valve, the viscosity of the mixed adhesive, and the desired bead/shot geometry. As a general rule, use the straight-cut cylindrical tip (orifice 1.0-3.0 mm) for general dot and bead dispense; the tapered tip (orifice 0.3-1.0 mm) for fine-needle dispense, jetting, and underfill; and the Luer taper for medical, dental, and lab applications where a needle or cannula is attached by the user.

A 1.6 mm straight-cut tip is the default for 1:1 to 4:1 ratio epoxies and polyurethanes in the 1,000-10,000 cP range, and works well at dispense pressures of 1.5-3.5 bar. For higher-viscosity adhesives (10,000-50,000 cP) or larger shot sizes (0.5-5 mL), step up to a 2.5-3.0 mm tip to keep the dispense pressure under 5 bar. For low-viscosity (< 500 cP) or jetting applications, the 0.3-0.5 mm tapered tip is specified — the geometry of the tapered tip converts the radial outflow at the last element into a near-laminar axial jet, which is what allows clean jetting at standoff distances of 1-5 mm.

Typical Applications

Electronics SMT and underfill. Surface-mount adhesive dispense, corner bonding of BGAs, and capillary underfill of flip-chip and BGA packages. The 16-element PA66 nozzle with a 0.5-0.8 mm tapered tip is the standard — the small orifice is required for shot sizes in the 0.005-0.05 mL range, and the PA66 tolerates the elevated cure-oven pre-heat (typically 80-120°C) without softening.

Automotive body-in-white structural bonding. Two-component epoxy and polyurethane structural adhesives dispensed on body-in-white at 4-8 mL/s through 2.5-3.0 mm straight-cut tips. The 24-element PP nozzle is replaced every 2-4 hours of continuous dispense (or every 50-100 kg of mixed adhesive) to keep the element stack free of cured residue.

Construction-chemicals anchoring and grouting. Two-part chemical anchor bolt systems (epoxy, vinylester, polyester) are sold as side-by-side cartridges with a 1:1 or 10:1 ratio. The static-mixer nozzle is shipped pre-attached to the cartridge and is replaced with every cartridge. Our 16-element PP nozzle with 1/4 in. bayonet and 10 mm tip is the standard for this application.

Potting and encapsulant in electronics. Two-part silicone and polyurethane potting compounds are dispensed through 24-element nozzles with 2.5-4.0 mm tips at 0.5-3 mL/s. The PP nozzle is the standard; the UV-opaque variant is required if the potting compound is UV-curable or UV-traceable.

Medical device bonding and potting. Medical-grade two-part silicones and epoxies used in catheter assembly, sensor encapsulation, and implant bonding use the Class VI PP nozzle with luer-lock outlet. The biocompatibility certification and lot traceability are required for FDA 510(k) and EU MDR submissions.

Storage, Handling & Replacement

Each nozzle is sealed in a nitrogen-purged multi-layer foil pouch (PET/Al/PE) with a 5-g desiccant pack. The shelf life of the unopened pouch is 24 months for PP and 18 months for PA66 when stored at 5-25°C and < 60% relative humidity. Once removed from the pouch, the nozzle should be used within 30 days; longer exposure to ambient humidity degrades the PA66 dimensional stability and may cause the housing to swell by 0.5-1.0%.

At the start of a dispense run, the nozzle must be primed. A 1-3 mL dispense through the tip purges the air from the inlet manifold and the first 2-3 elements; until the discharge color is uniform, the dispensed material should be discarded. After priming, the nozzle is ready for production dispense. At end-of-shift or end-of-chemistry, the nozzle is removed and discarded — the dispense valve is wiped clean and the next nozzle is loaded.

A nozzle that has been left idle in a dispense valve for more than 4 hours (or for the rated pot life of the mixed adhesive, whichever is shorter) should be discarded and replaced, even if the dispense volume since last prime was small. Cured residue in the element stack is the most common cause of downstream valve contamination, and the cost of a replacement nozzle is negligible compared with the cost of a contaminated valve rebuild.

Comparison with Reusable Mixers

Parameter	Disposable Nozzle (PP/PA66)	Reusable SS316L Precision Mixer
Pressure Rating	4-8 bar	16-70 bar
Max Temperature	80-150°C	200°C
Viscosity Range	50-50,000 cP	50-250,000 cP
Abrasive Filler Tolerance	Low-Medium	High
Reuse Cycles	Single use	500-1,000 cycles
Cost per Shot	Higher (replaced per shift/run)	Lower (amortized over 500+ cycles)
Cleaning Required	None	Solvent flush / ultrasonic
Cross-Contamination Risk	Zero (new nozzle per chemistry)	Requires validated cleaning protocol
Typical Element Count	16-24	24-32
CoV Performance (1:1 to 10:1)	≤ 1%	≤ 1%

Frequently Asked Questions

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