Patent GB-1078554-A (GB)
Title: Detergent treated towels
IPC: C11D17/04
Filed: 1965-03-26
Abstract: Two-ply paper towels suitable for cleaning glass surfaces, particularly car windows and windscreens, comprise two superimposed adherent sheets, one of which (the "cleaning" ply) is substantially imperforate, is composed of a fibrous material which tends to undergo physical deterioration upon contact with a wet surface, and has a detergent material applied to the outer surface thereof, and the other of which (the "drying" ply) is substantially free of detergent material and consists of a fibrous material having a high water absorption capacity and being substantially resistant to physical deterioration upon contact with a wet surface.  The cleaning ply may be conventional newsprint stock or a paper stock containing at least 30% of groundwood, e.g. a stock comprising 35-45% of groundwood and 55-65% of bleached Kraft or sulphite pulp.  The drying ply may be composed of high wet strength paper towel stock, Kraft pulp, or a mixture of Kraft pulp and groundwood containing not more than 25% groundwood.  The wet strength of the drying ply may be increased by chemical treatment, e.g. with urea/formaldehyde or melamine/formaldehyde resins.  Typical detergents for application to the cleaning ply include alkali metal soaps, alkaryl sulphonates, alkyl sulphates, petroleum sulphonates, sulphonated glycerides, suspensions of jewellers' rouge in alcohol, and oxides of brass and aluminium. Specified detergents are sodium dodecylbenzene sulphonate and sodium oleylnaphthalene sulphonate. The detergents may be applied to the cleaning ply from solution, e.g. in ethylene glycol optionally containing a buffering agent such as citric acid, suitably in a printing-type operation, and it is preferred to coat only a minor proportion of the surface. Stripes or discreet squares of detergent may be applied, preferably coloured so as to distinguish the two plies. Alternatively, the two plies may in themselves be of different colours.  The towels may be in the form of a roll, perforated at suitable intervals, or may be packed in the form of individual towels.  In use the glass surface to be cleaned is wetted with plain water, rubbed with the cleaning ply thus releasing detergent and providing abrading action by breakdown of the cleaning ply, and the drying ply is then used to absorb the water and dirt and provide a clean finish.ALSO:Two-ply paper towels suitable for cleaning glass surfaces, particularly car windows and windscreens, comprise two superimposed adherent sheets, one of which (the 'cleaning' ply) is substantially imperforate, is composed of a fibrous material which tends to undergo physical deterioration upon contact with a wet surface, and has a detergent material applied to the outer surface thereof, and the other of which (the 'drying' ply) is substantially free of detergent material and consists of a fibrous material having a high water absorption capacity and being substantially resistant to physical deterioration upon contact with a wet surface.  The cleaning ply may be conventional newsprint stock or a paper stock containing at least 30% of groundwood, e.g. a stock comprising 35 - 45% of groundwood and 55-65% of bleached Kraft or sulphite pulp.  The drying ply may be composed of high wet strength paper towel stock, Kraft pulp, or a mixture of Kraft pulp and groundwood containing not more than 25% groundwood.  The wet strength of the drying ply may be increased by chemical treatment, e.g. with urea/formaldehyde or melamine/formaldehyde resins.  Typical detergents for application to the cleaning ply include alkali metal soaps, alkaryl sulphonates, alkyl sulphates, petroleum sulphonates, sulphonated glycerides, suspensions of jewellers' rouge in alcohol, and oxides of brass and aluminium.  Specified detergents are sodium dodecylbenzene sulphonate and sodium oleylnaphthalene sulphonate. The detergents may be applied to the cleaning ply from solution, e.g. in ethylene glycol optionally containing a buffering agent such as citric acid, suitably in a printing-type operation, and it is preferred to coat only a minor proportion of the surface. Stripes or discreet squares of detergent may be applied, preferably coloured so as to distinguish the two plies. Alternatively, the two plies may in themselves be of different colours.  The towels may be in the form of a roll, perforated at suitable intervals, or may be packed in the form of individual towels.  In use the glass surface to be cleaned is wetted with plain water, rubbed with the cleaning ply thus releasing detergent and providing abrading action by breakdown of the cleaning ply, and the drying ply is then used to absorb the water and dirt and provide a clean finish.