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Two-component adhesive cartridge systems

Two-component adhesive cartridge systems
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Two-component adhesive cartridge systems - 1

Two-component adhesive cartridge systems There are four major cartridge system design styles in the marketplace today. Craig Blum, business manager - adhesive packaging systems, TAH Industries, explains some of the advantages Until the invention of two-component car- tridge systems users of two-part adhesives and sealants had few choices in terms of packaging and application systems. High- volume users who used material in one designated location might have been served reasonably well with expensive meter mix equipment - still a viable option today for large-scale dispensing applica- tions such as automated assembly lines. However, for the majority of those who used two-component adhesives at remote job sites or in small volumes not suitable for meter mix systems, the only available options were buckets, cans, tubs, and tubes that required manual pouring, squeezing, weighing, and mixing. While many still use these manual systems most have found that two-component cartridges are signifi- cantly more convenient and economical after considering the following factors: • Labour involved in manually pouring, squeezing, weighing, mixing, and • Reliability from one mix to another - how to control accurately and consis- tently each amount and avoid under- • Waste of unused material. • Disposal of unused material. • Health risks from direct contact with • Exact placement of material. The most mature cartridge design contains one component surrounded by another, i.e., two cylinders, one within the other. These are available in volumes ranging from and 10:1. They require a special dispensing gun made just for this style of cartridge, although some of the smaller 75ml and 150ml versions can be dispensed using a special screw adaptor or a caulking gun using another special adaptor. The contents are mixed on demand using a static mix nozzle so that when users are finished with the application and material still remains they can simply throw away the static mixer and reseal the cartridge for future Currently the most widely-used design Side-by-side cartridges. Coaxial, side-by-side (as above), and barrier/injection systems require specialised dispensing guns. consists of two side-by-side cylinders that are snapped together or moulded in one piece. There is a much greater range of vol- umes and ratios for this type of cartridge. They are available in unit dose or small syringe configurations ranging from 1ml to 30ml - these syringes usually are dispensed using a hand-held plunger. The larger sizes range from 50ml to 1500ml. There are many ratios available: 1:1, 2:1, 4:1, and 10:1 being the most popular. As with the coaxials, larger side-by-side cartridges require a special dispensing gun that can be used only with a specific car- tridge size and ratio, although some dis- penser models allow for quick changeabil- ity from one ratio to another within the same volume size cartridge. The contents, as with the coaxial, are mixed on-demand using a static mix nozzle; they can be re- Barrier or injection-style kits These are fairly specialised cartridges and the oldest technology in the group. They are ideal for non-standard ratios that are not readily available in other cartridge sys- these kits the ratio options are almost lim- itless; volumes range from 30ml to 600ml. The barrier style is used with ratios Article published in FAST Magazine, UK - Tel. +44 1844 202027

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Two-component adhesive cartridge systems - 2

between 1:1 and 10:1; the injection style with ratios greater than 10:1. As with the coaxial and side-by-side cartridges these kits require a special dispensing gun with a cartridge retainer to fit the particular size and ratio cartridge. However, these same universal cartridge (u-TAH) system used with many of the tridges these systems used. The user must component, then pump back and forth properly - this can be done manually, semi- automatically, or automatically. The inher- ent disadvantages of this system are that it is very easy to under-mix or over-mix the cartridge must be used...

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