Report Volume 25, PT. 3

Report Volume 25, PT. 3

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 edition. Excerpt: ... of making paper on a Fourdrinier machine is shown, as described by Mr. Nixon in his article, from its earliest formation to the completed paper ready for the packing room. Illustration No. 11 shows the process of super-calendering, which means the process, when desired, of giving the paper a higher glazing or finish. The calender consists of a series of highly chilled iron, and pressed cotton or paper rolls, which are placed alternately between the frames, and revolve at a high speed. The sheets of paper are introduced by an attendant whose position is on the platform seen near the top of the calender. The sheets are carried over the rolls continuously, and as they pass out at the bottom of the calender, as shown in the illustration, are reeled into rolls for shipment or further treament by cutting into shape. MAKING PAPER OUT OF WOOD BY THE SULPHITE PROCESS. As stated by Mr. Nixon, Mr. Tillghman made the first experiments in boiling wood with sulphurous acid at Harding's mills, Manayunk, during the latter part of the sixties. This was Benjamin C. Tillghman, a well-known chemist, then of Philadelphia; his process was fully covered by patents, and they form the basis of the present process known as the sulphite process. He first used long 10-inch cylinders, lead lined, and although good fibre was obtained, he was surrounded by so many difficulties, that after an expenditure of some $40,000, the experiment was finally abandoned. Fry and Ekman, Bergvik, Sweeden, took the process up about 1870 and used nitric and various acids and water alone as resolvent agents. In 1872, what is now known as the Ekman process was being worked by this firm in a three-ton mill, with eight small jacketed digesters, and continued operation under cover more

Product details

  • Paperback | 72 pages
  • 189 x 246 x 4mm | 145g
  • United States
  • English
  • black & white illustrations
  • 1236748786
  • 9781236748782