Kevin Brownsill, head of learning and development for adhesives and dispensing specialist Intertronics, explains the key features in the latest Technical Bulletin.
Intertronics
Static mixing nozzles are vital for dispensing and are used for mixing or blending of two-part adhesives, potting
A static mixing nozzle has several key design features and characteristics. These include the mixer’s element shape and style, mix ratio, inner diameter, the number of elements, connection interface, and nozzle termination.
The first aspect is the shape of the element section. Static mixers are typically round (helical) or square (Quadro). Element sections are usually white, yellow or blue if they are round, and green if they are square. This is typically the case for 1:1 and 2:1 mix ratio. However, this can deviate when nozzles are designed for wider ratios such as 4:1 and 10:1, where they often have elements or features that are orange instead. The ratio will depend on the material you are using.
As well as style and ratio, the inner diameter and the number of elements contained can be identified from the elements section. The inner diameter for round nozzles, or width for square nozzles, is typically measured in millimetres (mm) and rounded to the next whole number. Typically in multiples of four, elements can be determined simply by counting.
Another distinguishing design feature is the interface between the metering and mixing equipment or dispensing cartridge, and the nozzle. Intertronics supplies medmix MIXPAC™ nozzles, which have a number of designs to cater for different sizes and design of cartridge and equipment.
Categorised into “systems” based on size, design, and application, its unique B-System and F-System cartridges and mixers are moulded to keep the two material parts separate further into the mixer to help avoid cross-contamination. These systems have an interlocking mechanism, whereas the A-System uses a bayonet, and the C-System uses a retaining threaded nut, emulated by the moulded-thread ‘G’ type nozzles.
The opposite end of the static mixing nozzle is the “tip”, which is the dispensing end of the mixer – the tip can have different termination designs. Nozzles can have a variety of tip types to accommodate flow rates, attachments, or other requirements. They are available in several designs to help with high flow, attachment of a blunt Luer lock dispensing tip, or other speciality ends including spreaders.
medmix MIXPAC mixing nozzles can have key information moulded into them. This tends to include the brand, diameter and number of elements. These marks help you to have the necessary information to identify the static mixing nozzle you require.
MIXPAC nozzles are suitable for most two-part cartridge systems and metering and mixing machines and can be used for dispensing two-part adhesives and potting compounds formulated from materials such as epoxy, polyurethane, silicone and MMA methacrylate. Contact Intertronics if you need more help identifying the mixing nozzle you need from our extensive inventory.