Determining the amt. or detergent required for washing textiles - by using marked vessel and tablets contg. sequestering agents and indicator to measure water hardness

• Main Authors: ILC,VLADO, WALTHER,GUNTRAM,.DR, KRINGS,PETER,.DR
• Format: Patent
• Language: English; German
• Published: 07.04.1977
• Edition: 2
• Subjects: FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LAUNDERING; LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILEARTICLES; MEASURING; PHYSICS; TESTING; TEXTILES; TREATMENT OF TEXTILES OR THE LIKE

Means for measuring out detergent in function of water hardness consists of a combination of (1) a measuring vessel, e.g. a beaker, having vol. 100-300(150-250)ml. and provided with a marking for the quantity of water to be poured in and opt. a graduation for powdered and/or liquid detergent quantity, and (2)>=3 tablets. Each tablet weighs 0.1-3g. and contains, by wt., (a) 1-30% water-soluble sequestering agents forming soluble complex salts with alkaline earth ions; (b) 0.001-0.5(0.01 0.1)% indicator and (c) 69-98.99% standard pelletising agents, disintegrating agents and fillers, which dissolve in water without causing turbidity. Sequestering agent quantity/tablet is measured so that 3-7mg. Ca ions/100 ml. water are completely bonded after dissolving one tablet. Water hardness is determined by filling measuring vessel up to mark with water to be tested. Tablets are then added, with mixing, until a permanent colour change is set up. Each tablet is added after complete dissolution of preceding tablet. Quantity of tablets is directly proportional to water hardness and to detergent quantity to be used.