Voith Patent Gmbh

Suzano S.a.

Fibria Celulose S/a

Danilo Oyakawa

Thomas Thoroee Scherb

Rogerio Berardi

Luiz Carlos Silva

Romolo Ranocchia

Ademilson Massoquete

John Jeffery

Luiz Carlos Da Silva

Lippi Alves Fernandes

Francis J Cunnane

The present invention relates to an improved process for producing chemical cellulose pulp wherein biopolymers are added immediately before, during or after a bleaching step, depending on pulp characteristics and on process conditions used. The biopolymers according to the present invention are starches chemically modified by an etherification reaction. This treatment results in a differentiated pulp having improved physical, chemical and mechanical properties when compared with cellulose pulps obtained by traditional processes. The use of said biopolymer alters the relations between important pulp properties rendering their application in papermaking process advantageous. This differentiation increases the possibilities of use and also of new applications, including for the substitution of pulps produced from other cellulose sources. Thus, the present invention also relates to methods of making paper, such as printing, writing, decorative, special or tissue-type papers, through the use of the cellulose pulps modified by the above process.

Methods of making paper and paper with modified cellulose pulps

The present invention relates to an improved process for producing chemical cellulose pulp wherein biopolymers are added immediately before, during or after a bleaching step, depending on pulp characteristics and on process conditions used. The biopolymers according to the present invention are starch by an etherification reaction. This treatment results in a differentiated pulp having improved physical, chemical and mechanical properties when compared with cellulose pulps obtained by traditional processes. The use of said biopolymer alters the relations between important pulp properties rendering their application in papermaking process advantageous. This differentiation increases the possibilities of use and also of new applications, including for the substitution of pulps produced from other cellulose sources. Thus, the present invention also relates to a process for the preparation of paper, such as printing, writing, decorative, special or tissue-type papers, through the use of the cellulose pulps modified by the above process.

Process for producing modified cellulose pulps, cellulose pulp thus obtained and use of biopolymer for producing cellulose pulps

A belt for a machine for the production of a fibrous web, in particular paper or cardboard, the belt including a carrier structure, a first material which forms a first pattern on at least one side of the carrier structure such that a portion of the carrier structure remaining exposed, and a second material which forms a second pattern, the second pattern being applied onto the first pattern, wherein the second pattern is completely disposed within the first pattern and a method for producing same.

Belt for a machine for the production of a fibrous web, particularly paper or cardboard, and method for the production of such a belt

A method of producing a tissue paper web in a papermaking machine including the steps of forming the web on a skin, selecting a quality of the web, bypassing a dewatering apparatus, passing the skin and web through a nip and conveying the web to a drying cylinder from the skin. The web is formed in a forming section of the machine from a pulp suspension on the skin. In the selecting step a quality of the web is selected thereby defining a quality selection of absorbency or tear resistance. The bypassing step includes bypassing the dewatering apparatus with the web and selecting a type of the skin dependent upon the quality selection. The machine being configured to bypass the dewatering apparatus dependent upon the quality selection; when the quality selection is tear resistance then the skin is a non-structured skin or a felt and the dewatering apparatus is bypassed, when the quality selection is the absorbency then the skin is a three-dimensionally structured skin or a structured mesh and the dewatering apparatus is not bypassed. In the passing step the skin and the tissue paper web passes through a nip defined between a cylindrical surface of the drying cylinder and a mating surface of a press roller.

Machine for the production of tissue paper

This invention relates to a method for the production of a tissue paper web, which is produced from a pulp suspension having fibers. The method according to the present invention is characterized in that the pulp suspension is formed, at least partly by, a pulp suspension fraction obtained through the treatment of old paper, has a refining degree of less than 30&#xb0; SR and is of such condition that a laboratory sheet according to TAPPI 205 SP 95 (Rapid K&#xf6;then), whose breaking length measured according to TAPPI 220 and TAPPI 494 is 4.0 km or more, is produced therefrom.

Method for the production of tissue paper

An apparatus for producing a fibrous web includes: a circulating permeable structured belt defining a sheet forming zone in which the fibrous web is formed; a circulating unstructured permeable supporting belt; a pressing section through which the fibrous web is led lying between the circulating permeable structured belt and the circulating unstructured permeable supporting belt; a Yankee cylinder having a surface and defining a press nip and a press nip region, wherein the fibrous web is led together with the structured belt through said press nip, the fibrous web in the region of the press nip being transferred from the structured belt to the surface of the Yankee cylinder; at least one doctor which doctors off the surface of the Yankee cylinder continuously; and a coating device which recoats the surface of the Yankee cylinder so that a renewed coating material is always present in the press nip.

Process and apparatus for producing a tissue web

An apparatus for producing a fibrous web, in particular a tissue web, with a press zone through which the fibrous web is passed in a lying position between a circulating permeable structured belt and a circulating permeable non-structured supporting belt. A press nip is provided on a Yankee Cylinder through which the fibrous web is passed in the lying position together with the structured belt between the structured belt and the Yankee cylinder, whereby the press zone is limited on the side adjacent the supporting belt by a substantially smooth surface, and whereby the supporting belt is not brought together with the fibrous web and the structured belt until proximate to the press zone.

Tissue machine

Dewatering system for dewatering a web. The system comprises a former, a belt press, and a structured fabric comprising a paper web facing side and being guided over a support surface and through the belt press. The structured fabric runs at a speed differential relative to a wire of the former. This Abstract is not intended to define the invention disclosed in the specification, nor intended to limit the scope of the invention in any way.

Twin wire for an ATMOS system

A device for producing a fibrous web and, in particular, a web of tissue including a press zone through which the fibrous web together with an endless permeable structured band and an unstructured permeable supporting band is fed while lying between the structure band and the supporting band, a press nip provided on a drying cylinder through which the fibrous web together with the structured band is fed while lying between the structured band and the drying cylinder, and after which the fibrous web is led from the drying cylinder through a calender.

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Sao Paulo, Brazil

Danilo Oyakawa