Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1996-09-30
1999-09-14
Yamnitzky, Marie
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428330, 428331, 428340, 428342, 4285375, 162135, 162147, 1621811, 427209, 427361, 427395, D21H 1938, B05D 504, B32B 516
Patent
active
059520914
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a web printing paper coated on both sides, consisting of a coating base paper that contains mineral filler and, as fiber components, wood pulp and/or cellulose. The coating, which contains pigment and binder and serves to absorb the printing ink, is applied by means of a film press. The invention also relates to a process for manufacturing the web printing paper.
2. Description of the Prior Art
Web printing papers of the aforementioned type are used in the production of periodicals, especially illustrated periodicals, magazines, catalogs and advertising brochures, such as those normally inserted into daily newspapers or illustrated periodicals.
Numerous attempts have already been made to reduce production costs for the papers in question, particularly by reducing the grammage of the coating base paper or by replacing the cellulose and/or wood pulp fibers with recycled fibers.
An overview of the offset papers containing wood that are commonly used in Europe is found in the article "Study of Binder Systems for LLWC and MFP Papers" ("Studie ueber Bindemittelsysteme fuer LLWC and MFP Papers") published in the "Paper Manufacturing Weekly" ("Wochenblatt fuer Papierfabrikation") 9 (1988), pp. 337 to 344. This article also describes a film press used to apply preparations to the paper types in question. The described pigment composition consists of a mixture of 60 parts of English China Clay and 40 parts of a fine American kaolin. The authors of this article conclude that when an SD coater (short dwell time coating device) is used, 20 parts by weight of binder are required for an application of 5 g/m.sup.2, while 30 parts by weight are needed for an application of 3 g/m.sup.2. However, if a film press is used instead of an SD coater, it is considered necessary to increase the binder level in order to achieve the same printing gloss, albeit with lower opacity.
In the "Paper Manufacturing Weekly" 16 (1990), pp. 701 to 708, and "Pulp and Paper Canada" 92:4 (1991) pp. 52-58, there are reports on the surface treatment of newsprint paper by means of a film press. In these studies, a base paper was used that had an ash content of only 0.4% by weight. No information is given about the fineness of the pigments used for the surface treatment. In the formulas used for the surface pigmentation, the extraordinarily high binder content of 70% by weight, relative to the pigment, is notable. The studies are essentially limited to a coat application weight of 5 g/m.sup.2 per page or side.
EP-0 377 983 A2 relates to a newsprint paper coated by means of an air brush or a roller coating device, which is said to have improved ink absorption, surface strength and opacity. Coat weights between 1 and 12 g/m.sup.2, preferably between 3 and 8 g/m.sup.2, per side to be printed are disclosed, whereby a total grammage of 60 g/m.sup.2 is not exceeded. The filter content of the known coating base paper lies in the usual range of between 0.5 and 10% by weight, preferably, however, at less than 0.5% by weight.
In the "Paper Manufacturing Weekly" 1 (1988) pp. 1 to 6, the article "Surface Coated SC Papers, a Challenge for LWC Papers," relates to coating SC papers with a filler content of 15 to 25%. As the application device, an SDTA application system (short dwell time applicator) is reported. The application weights are in the range up to 3.5 g/m.sup.2 per side, while in the case of coating base papers with a lower filler content of less than 10% by weight, higher application weights are required--for example, in the so-called LWC papers, a coating application weight of up to approx. 9 g/m.sup.2 per side.
According to the article: "Possibilities for the On-Line Coating of Filled, Wood-Containing Papers" (Moglichkeiten zum On-Line Streichen von gefullten, holzhaltigen Papieren) in the "Paper Manufacturing Weekly" 13 (1992), pp. 507-515, highly-filled upgraded SC papers are initially pretreated by means of a film press with a pigmentation consisting of calcium ca
REFERENCES:
patent: 3714107 (1973-01-01), Smith
patent: 4241142 (1980-12-01), Kaliski et al.
patent: 4948664 (1990-08-01), Brociner
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patent: 5609964 (1997-03-01), Ogawa et al.
patent: 5753077 (1998-05-01), Horand et al.
Dahling Paul-Heinz
Gurtler Adam
Horand Dieter
Pelech Bernd
Stora Feldmuhle AG
Yamnitzky Marie
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