| Show kinds of sandpaper used use d in industry there comes the time in the domestic life of the man 0 of f the house when of all things in the world he yearns with super powered earnestness tor for a bit of sandpaper maybe not large enough to cover a canceled postage stamp but at the immediate moment that scrap of sandpaper is worth its weight in gold to him and it is nonexistent in his otherwise happy home it gives him small comfort then to be informed that there are in this country manufacturing plants where the abrasive stuff is turned out by the acre where miles of the material in the making are run through automatic machines and further that the growing U uses es for sandpaper in all sorts of I 1 industries are steadily increasing inc beasing its output most sandpaper is not paper and sand is not the scratchy stuff which makes it useful but the material always will be known as sandpaper sandpaper has ceased to be mere gra grains ins of sand glued to paper and has become a tool with thousands of cutting edges D H killeffer of new york says in a report to the american chemical society variations of as much as 1000 per cent in the usefulness of sandpaper were formerly for merl common today myrius myriads of tiny cutting edges arranged and held in orderly array cut surfaces instead of wearing down surfaces by mere friction n literally millions of dollars worth of sandpaper er are consumed annually in scores score s 0 of f different industries dus tries production of such widely different articles as fine furniture and felt hats automobiles and airplanes shoes and steel specimens machine work and marbles gem stones and golf clubs consume of coated abrasives much of the product designated as sandpaper is not made with paper and a minimum proportion of it uses sand in the sense of silicon dioxide as an abrasive some varieties of coated abrasives are required to meet the needs of users and each must be accurately fitted to certain specific requirements above all each of the three thousand must be made with the greatest possible uniformity and at a unit price that must be kept down the most im important development in this industry has been the process of securing securing 9 uniformity in distri distribution distribute buti on and position n of abrasive particles on the sheet by using an electric field |
