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Spray June 2016

diameter finished can heights range from about 95 to 215mm, with overflow capacities of 130 to 310mL. The shortest cans, sometimes called “squats,” are rarely ordered since they are relatively unattractive and are disliked by retailers who relate product sales income per lineal foot of shelf space. The empty weights of a production lot of aluminum cans will vary only slightly, often well within a one-gram range. This is an advantage where the filler’s production lines include an automatic gross weight checkweigher. The net product can then be weighed more accurately by simply subtracting the tare weight of the average weight can. In contrast, tinplate (ETP) cans may vary up to about 3% in weight, necessitating a broader acceptance range for checkweighers. On average, U.S. aluminum canmakers perform six to nine dimensional checks (depending on design), two pressure checks (bulge and burst), three inside lining tests, two decoration tests and various analytical tests per lot. For example, the diameter of a 45 x 190mm can must be within a tolerance of 44.8 to 45.2mm, while the acceptable height is from 189.25 to 190.75mm. Typical results are with half or less of these ranges. All aluminum aerosol cans are lined while in the “cup” stage—before the open end is formed by a multistation die-forming machine. As a rule, three slightly overlapping applications of liquid resin are applied by a bayonet sprayer while the can is rotated at about 600rpm. The two main linings are various epon-phenolics and polyamideimide (PAM). Drums of these resin solutions are often supplied from Europe. The dispersions meet the Coalition of Northeastern Governors (CONEG) negligible heavy metal limits and have shelf lives of six months before increasing viscosity becomes a problem. After heat curing, the can linings should have a dry film thickness of about 7–13 microns. They are sufficiently flexible to maintain their integrity, even under the forming of the can curl and various dome contours (rounded, turret, snaplock and others). While initially tests for WACO Electrical Co., electrical conductivity results in the “cup” form, readings within the specification range of 0–25 milli-Ampere (mA) are almost always maintained by the finished can. Such ultra-low readings prove the linings to have virtually perfect coverage, important for corrosion inhibition, fragrance stability and preservation of various drug substances. In contrast, three-piece tinplate cans, with their relatively incomplete resin linings, cannot be used for thioglycolate-based depilatories, mousses and certain other products. A possible problem with epon-phenolic resins has recently assumed importance. Although they had been Great Lakes Chemical Corporation (open end) plain interior 207.5 x 405 tinplate can for methyl bromide holding 1.5 lb. of product. For inverted filling. Obsolete. June 2016 Spray 23 FORMULATE CREATE Formulated Solutions offers the most streamlined turnkey Concept-to-Consumer CDMO solution in the industry. Specializing exclusively in Consumer Healthcare, Rx, OTC, Medical Device, Aerosol, BOV Aerosol and Semi-Solid manufacturing. Visit our website: www.formsol.com Sales Inquiry: websales@formsol.com Phone: 727-373-3970 INNOVATE Aerosols and Foams • Pressurized Container Systems - Bag-On-Valve Airless & Metered-Dose • Plastic, Laminate and Metal Tubes Wipes & Sachets • Semi-Solids, Liquids, Pastes and Gels


Spray June 2016
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