The dispensing ball is a special plastic ball used to dispense liquid fabric softener in clothes washing machines that lack built-in softener dispensers. Liquid fabric softener has to be added at the correct time to a load of laundry (the rinse cycle) in order to work effectively.
In top-loading machines, the Downy Ball accomplishes this with no user input, other than the initial loading, and filling of the ball.
Video Dispensing ball
Operation
These balls can not be used in tumbling washers, because the tumbling releases the fabric softener before the rinse cycle. They cannot be used at all in the dryer.
Maps Dispensing ball
Downy Ball
The Downy Ball is a variant sold by Procter & Gamble specifically designed for use with traditional agitator-based top-loading washing machines which lack built-in fabric softener dispensers, and it won't work correctly on front-loading machines. Liquid fabric softener is poured into the Downy Ball through a hole on the top side. The ball is then tossed into the washing machine with the clothes and detergent, where it floats in a vertical position, with an internal rubber weight floating inside and trapping the softener inside. In the spin cycle, between the wash and rinse cycles, the internal rubber weight moves aside due to Newton's first law of motion, allowing the fabric softener to spill out onto the clothes, just in time for the rinse cycle.
References
Source of article : Wikipedia
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