Method for providing irreversible smoothness in a paper rawstock

Details Method for providing irreversible smoothness in a paper rawstock Method for providing irreversible smoothness in a paper rawstock

1993-02-10

1995-01-03

Beck, Shrive

Coating processes

Application to opposite sides of sheet, web, or strip

Roller applicator utilized

427361, 427363, 427364, 427365, 427366, 427428, 162206, 162207, B05D 100, B05D 500

Patent

active

053784979

ABSTRACT:
The method comprises the application of a liquid film to a paper or paperboard rawstock web in a controlled and uniform manner to achieve a moisture gradient in the Z-direction thickness of the web to a depth of less than about one-half of the web thickness, and then pressing the treated web in at least one nip of a calender device before drying the web. The liquid application plasticizes only the surface fibers of the web so that the paper fibers at or near the surface become deformed and bonded under pressure to achieve a substantially irreversible smoothness upon being rewetted in a coating application or the like.

REFERENCES:
patent: 4596633 (1986-06-01), Attwood
patent: 4749445 (1988-06-01), Ureeland
patent: 4973441 (1990-11-01), Keller
patent: 5076888 (1991-12-01), Korpela
The effect of moisture and moisture gradients on the calendering of paper, M. B. Lyne, pp. 641-669.
Effect of pretreatment of LWC basestock on coated paper properties, Tappi Journal, P. Lepoutre, W. Bichard, and J. Skowronski, Dec. 1986, pp. 66-70.
Precalendering and its effect on paper-coating interaction, Tappi Journal, G. Engstrom and J. F. LaFaye, Aug. 1992, pp. 117-122.

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