Practical Paper-making: A Manual for Paper-makers and Owners and Managers of Paper Mills, to ... by George Clapperton

Author:George Clapperton
Language: eng
Format: epub
Publisher: C. Lockwood
Published: 1907-03-25T05:00:00+00:00

In the drying of loft-dried papers the temperature

of the loft must be kept as near that of the ordinary summer atmosphere as possible, and as much advantage as possible should be taken of the atmospheric air, when sufficiently dry, to be admitted to the loft without risk of making the papers mussy after drying.

J

GLAZING AND BURNISHING.

When paper is glazed by the calenders attached to the machine, it is usually damped before being put through the calender rolls. Prior to this, however, it has generally passed between what are called the smoothing rolls, which are situated just before the last set of drying cylinders. These usually consist of two rolls heated by steam, though not to the same extent as the calender rolls.

By keeping the paper a little damp as it passes through these smoothing-rolls, and not heating the last cylinders any more than is necessary to prevent damp spots, the surface imparted by the calender-rolls is much improved. When a good surface is wanted the stuff must be kept fine, as long stuff, though taking on a good finish, always rises up in the sheet, causing a roughness, especially on the underside. To quote the remark of a shrewd old paper-maker—" It's just like smoothing sand and smoothing gravel."

Even papers made from long stuff are very liable to lose their surface, owing to this rising of the longer

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