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Spray Technology: Propelling Toward the Future

By: Jeff Falk
Posted: October 13, 2008, from the March 2006 issue of GCI Magazine.

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Bag-on-valve systems are offered, allowing standard cans to be used, and MixTek System LLC has introduced a system that successfully addresses the mix issue. The components of the product, contained in separate chambers, are mixed in a replaceable cartridge baffling system before being dispensed through the applicator nozzle. By removing the baffle system, the system also will accommodate a side-by-side flow of two component formulas.

In a test conducted by Westman Associates, Inc., the system was fitted with two Lechner barrier pack cans and a color-coded formulation of viscosity 1,200 cps.

Spectrophotometric analysis demonstrated that the system accurately dispensed and mixed the contents in a 1:1 ratio. According to the company, the system also accommodates components of gel or cream viscosity, making it appropriate for oxidation hair dyes, hair lighteners and sunless tanners that contain amino acids.

New atomizing systems also have allowed the reduction of propellants needed in an aerosol without sacrificing reasonable flow rates. The LINDAL Group developed Truspray valves to work with conventional aerosol containers. The system provides aerosol formation by using capillary atomization, reducing the amount of propellant. According to the company, the system also allows higher product content within the can and more precise application.

Bottles and Cans: Unlocking Potential

There is a good deal of give and take with the materials used for bottles and cans. The most cost-effective materials may not be suitable for certain formulations; materials appropriate for a brand may not withstand the pressures needed for aerosols … and the list goes on. Advances and innovations in the materials used for bottles and cans as well as the advances in manufacturing processes are opening cost-effective possibilities. Strong, recyclable and relatively low-cost, steel has been a stalwart for use in aerosol cans, but there have been limits in design flexibility and options with steel cans. DS Containers formed a partnership with Daiwa, applying Daiwa’s polymer-coating technology, to produce steel aerosol cans suitable for household and personal care items that address the limitations of steel. The polymer-coated steel that is applied as part of the coil-making process at Corus Packaging Plus in Europe combines the integrity of steel with the versatility and protective properties of plastic. Finished cans are scratch, corrosion and rust-resistant, eliminating the need for coatings, both inside and outside, which are used in conventional can-manufacturing. With the polymer coating, the cans meet FDA and EU food-grade criteria.