| 摘要 |
An improvement in the machine washing of solid soiled materials comprising withdrawing and recycling the tap water in contact with said solid soiled materials through a silicate cation exchange compound having some combined water and a particle size of between 10 mu and 100 mu of the formula (M2/nO)x . Me2O3 . (SiO2)y WHEREIN M is a cation of valence n exchangeable with calcium, Me is a member selected from aluminum and boron, x is a number from 0.7 to 1.5 and y is a number from 0.8 to 6, said agent having a calcium binding power of at least 50 mg of CaO per gram, said agent being maintained out of contact with said solid soiled materials, for such time until the water has a hardness of not more than 70 mg CaO/liter, then adding other soluble washing and cleaning compounds to said softened tap water and washing said solid materials while continuing the recycling of the wash solution through said silicate cation exchange compound.
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