Paperboard, paper machines

Continuous paper machines have undergone extensive mechanical developments since the 1950s, although the principles employed have changed Utde. Cylinder machines stUl are operated and involve multiples of five to seven cylinders they are used to produce heavy multi-ply boards. Fourdriniers are common in the industry and can be used to produce virtually any grade of paper or paperboard. They vary from 1 to 10 meters in width and, including the press and dryer sections, may be more than 200 m long. 

Paper may be coated either on equipment that is an integral part of the paper machine, ie, on-machine coating, or on separate converting equipment. Many plants include both types of coating equipment and utilize each to its maximum advantage for paper and paperboard. The combination of techniques is of particular value where more than one coating must be appHed to the sheet in order to obtain a product of desired quaUty. 

The type of paperboard used by the carton industry is boxboard. Boxboard may be categorized, based on the raw material, as combination or soHd boxboard. Combination boxboard, of which there are many grades, normally is made on a multicylinder paper machine using a substantial percentage of waste paper with virgin pulp. SoHd boxboard usually is made on a Fourdrinier paper machine using only virgin pulp and it is bleached or coated. 

Paper machine Machine on which paper or paperboard is manufactured. The most common type is the fourdrinier machine using the fourdrinier wire as a felting medium for the fibers. 

Uses Defoamer, antifoam for waste treatment, digesters, aeration ponds, syn. paper machines defoamer in food-contact coatings, paper/paperboard load pkg. adhesives, coatings... 

Chem. Descrip. Water-based defoamer composed of surface act. agents Uses Defoamer for paper machines, in starch and coating systems, and in wastewater appiics. defoamer in food-contact paper/paperboard component of paper/paperboard in contact with aq./fatty and dry foods Features No reportabie materiais (i.e paraffinic or naphthenic oiis) no adverse effects on sizing... 

The paper machine is the mechanical system used to convert the pulp suspension into a sheet of paper or paperboard. Until recently, the only type of paper machine used was the Fourdrinier design. 

Paper and pulp mill condensate - 189, 206 Paper and pulp mill gas, noncondensable 203 Paper, bleach solutions - 541, 693, 694, 724 Paper, groundwood pulp stocks - 541 Paper machine - 204 Paper mill liquor - 204, 206, 539, 724 Paper, neutral sulfite Cooking liquor - 541 Pulp stocks - 542 Spent liquor - 542 Paper, paperboard waste 542 Paper, parchmentizing - 542 Paper pulp, bleached - 694 Paper pulp slurry 694 Paper, sizing solution - 543 Paper stock 694 Paper, white water Acid - 543 Groundwood - 543 Neutral sulfite - 543 Newsprint - 543 Paperboard 544 Soda - 544 Sulfate - 544 Peracetic acid - 30 Parachloride 230... 

Uses Org. defoamer for paper machine coating, waste water, caustic boil-out, general Industrial applies.. In components of paper and paperboard In contact with dry food defoamer in the manufacture of paper and paperboard for food pkg. Regulatory FDA 21 CFR 176.180,176.210... 

Uses Antifoam for adhesives, PVC polymerization, blow down, and demonomerization, cutting fluids, surfactant cones., paper stock preparation, paper machine, sheet forming and coating, and wastewater defoamer In food-contact paper/ paperboard... 

Uses Deposit inhibiter controlling pilch deposition in pulp mill and bm. slock washers deframer in food-contact paper/paperboard Features Aids in boil-outs keeps paper machines free of pilch minimizes foam Reguldory FDA 21CFR 176.170,176.210 approved Properties Dk. bm. liq. completely misc. with water dens. 9.5 Ib/gal vise. 23.1 cps Hash pt. nonfiamm. pH 7.5-8.5 Orlene PC-582 [Nalco]... 

Uses Defoamer for paper machine white water loops, food-contact paper/paperboard, and wastewater applies, component of paper/paperboard in contact with aq,/fatty foods... 

Uses Anffoam for paper stock preparation, paper machine, sheet forming and coaf ng, and wastewater defoamer in food-contact paper/paperboard Reguldory. FDA21CFR 176.210 BGA, Korea, and MITI compliance Properdes Cone., self-emuls. 100% act. 

In addition, many grades of paper and paperboard are used in direct or indirect contact with foods. Thus, many mills only use paper chemicals that have been cleared for use by the U.S. Pood and Dmg Administration (PDA) (3), so that it is not necessary to segregate machine broke (off-grade paper and edge clippings that are reclaimed for their fiber value) and white water. Most of the chemicals discussed in this article are approved by the PDA for use in paper and paperboard that are intended for appHcations in food processing and packaging. However, there are various restrictions on both the specific functional uses and amounts of paper chemical additives which can be used, so the PDA status should be confirmed by the suppHer before use. 

Soluble silicates as an adhesive had long been used in small amounts when in the 1890 s there began an intensive and continuing effort to produce paper boxes to compete with the wooden packaging then in general use. Paperboard with a corrugated ply between two sheets and complex machines were developed. The later development of adhesive and cement uses... 

Uses Solvent for aluminum rolling oils diluent solvent in carbonless copy paper and in spark erosion machining as dean fuel in lamp oil and barbecue lighter fluids solvent in agric. pesticides/herbicides, cleaners, degreasers chem. teed-stock fuel food-contact paper/paperboard, rubber articles defoamer in food-contact paper/paperboard... 

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