International Paper Company

Narendra R Srivatsa

Larry D Markham

Richard R Wesolowski

Thomas E Amidon

Jean J Renard

Xiang Yu

Dennis J Kerstanski

Anant D Mahale

Paul Hart

Sanjay Patnaik

George Karles

The specification discloses a method for laminating a synthetic film or sheet to a fibrous web. According to the method, a heat-softenable material is combined as a sheet, film, spray or powder with a continuous fibrous web in interfacial contact with fibers of the fibrous web to form a composite. The composite is then continuously conducted through an extended nip dryer where heat and pressure are applied to the composite to effect a substantial reduction in moisture content of the composite while plasticizing the heat-softenable material so that at least a mechanical bond is formed between the material and the fibers of the web characterized by an intermingling of the fibers and the heat-softenable material.

Method for producing laminated webs

Deinking of impact and nonimpact printed paper is accomplished by repulping the printed paper in an alkali aqueous medium containing a deinking composition comprising one or more nonionic surfactants and/or alkanols. The presence of the deinking composition causes ink particles to agglomerate, which are removed from the aqueous medium by size and density separation. The invention provides an agglomeration method with high ink removal from all types of impact and nonimpact printed paper.

Deinking of impact and non-impact printed paper by an agglomeration

Recycling of mixed wastepaper, including plastic coated paper and printed paper, is accomplished by repulping the wastepaper mixture to disperse paper fibers, ink and plastic components into a pulp medium. Contact with a deinking chemical causes attraction between the ink components to form larger ink particles. The ink is adsorped onto the plastic components to form ink/plastic clusters which are removed to produce a substantially ink and plastic free pulp medium. Recycled paper products with improved strength comprising paper fibers from pulp medium produced in accordance with the method of the invention are also provided.

Method for recycling mixed wastepaper including plastic-containing paper

A high level of calcium carbonate filler is added to secondary fiber pulp by in situ attachment to the secondary fibers. The secondary fiber pulp is mixed with an alkaline salt such as calcium oxide or calcium hydroxide and contacted with a reaction gas such as carbon dioxide in a gas-liquid contactor apparatus through efficient mixing in order to precipitate filler material such as calcium carbonate crystal complexes on the secondary fibers. The resulting pulp products have comparable or, in some cases, better brightness, cleanliness, and other sheet properties as compared to filler addition by conventional methods.

Method for improving brightness and cleanliness of secondary fibers for

Deinking of impact and nonimpact printed paper is accomplished by repulping and defibering the printed paper in an alkali aqueous medium containing a deinking chemical to form an ink pulp medium. The presence of the deinking chemical causes separation of ink particles from the printed paper fibers. Removal of the ink particles from the ink pulp medium is accomplished by screening, flotation, forward cleaning, reverse cleaning, washing and mechanical dispersion procedures to produce a substantially ink free pulp medium. This substantially ink free pulp medium has a speck removal and brightness level sufficient to produce a high-grade recyclable grade paper product. The invention provides a deinking composition comprised of a mixture of one or more solvents, and nonionic and anionic surfactants, capable of high ink removal from all types of impact and nonimpact printed paper.

Deinking of impact and non-impact printed paper

Deinking of printed paper is accomplished by repulping printed wastepaper in an aqueous medium containing a deinking chemical. The presence of the deinking chemical causes initial agglomeration of ink particles to produce an ink pulp medium. Agglomerated ink particles are removed from the ink pulp medium by size and density separation procedures to separate coarse ink and produce a fine ink particle stream. The fine ink particle stream is recirculated to cause additional agglomeration of ink particles. The reagglomerated ink particles are removed from the fine ink particle stream by size and density separation procedures to produce a substantially ink free pulp medium. The invention provides agglomeration processes with high ink removal from printed paper.

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Ramsey, NJ, United States of America

Narendra R Srivatsa