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Slim filters were developed for female consumers and have been successful in the promotion and filtration of ultra-low cigarette brands. Slim filters resemble regular filters, but the substantial reduced diameter impacts the processing and pressure drop, requiring special acetate tows to be developed.

Reduced diameter impacts the processing and pressure drop requiring special acetate tows. Increased health awareness has led to the need for ultra-low cigarettes due to the reduced diameter: special acetate tows are developed to create high pressure drops on slimmer filters while maintaining a smooth smoke and draw resistance.

Effects of filter pressure drop: