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Foam pump
A foam pump, or squeeze foamer and dispensing device is a non-aerosol way of dispensing liquid materials. The foam pump outputs the liquid in the form of foam and it is operated by squeezing. The parts of the foam pump are similar to those of the other pump devices. Many times the foaming pump comes with a protective cap. Most of the components are made from polypropylene (PP).
==Operation==
A foam pump emits doses of the liquid contained in the bottle in the form of foam. Foam is created in the foamer chamber. The liquid constituents are mixed in the foaming chamber and this is discharged through a nylon mesh. The neck finish size of a foam pump is bigger than the neck finish size of other types of pumps, to accommodate the foamer chamber. The usual neck size of a foam pump is 40 or 43mm.
Where hair-coloring products previously contained instructions to vigorously shake the product, squeeze the bottle, and turn upside-down to disperse the product, foamers do not require any such actions. Some foaming dispensers include suction on the bottom to allow the container to remain upright.
Foamers can be purchased alone, or filled with a liquid product like soap. When the liquid is mixed with air, the liquid product can be dispersed through the pump-top as a foam. Foamers can also be re-used with different liquid products to extend the mass of the liquid by creating a foam-version.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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