Roughened cleaning sponge particularly for delicate surfaces, and manufacturing method therefor

Abstract From the Canadian patent

A roughened cleaning sponge, particularly for easily scratched surfaces, such as stainless steel surfaces, surfaces coated with thin layers of a plastic materials motor vehicle windshields, and the like which, comprises a core of a sponge-like material covered with an outer roughening fabric. Both the core of spongelike material and the roughening fabric the latter, being a knit tubing, are formed from a thermoplastic plastics. The crosswise seams are pressure heat sealed to define a stiff heat sealed band having scraping side and corner portions. A reliable and durable envelope is thus provided for the sponge-like core. Manufacturing begins with the formation of a basic blank of some …