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.