Method for producing paper or board and a product produced by the method

a technology of paper or board and production method, which is applied in the field of method for manufacturing paper and paperboard products, can solve the problems of high cost of copier paper, high drying capacity, and difficulty in removing water, and achieve the effect of retaining runnability and production efficiency at a high level and improving control of curl

Inactive Publication Date: 2006-02-09
VALMET TECH INC
View PDF1 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] It is an object of the present invention to provide a method suited for making paper products at lower raw material and specific energy consumption than those required in the manufacture of conventional products having similar qualities.

Problems solved by technology

Due to these basic requirements, the price of copier paper becomes high, because a large amount of fiber is used to obtain a high basis weight and the application of a surface size loads the web with imported surplus water that must be evaporated using a lot of energy.
As a result, a high drying capacity is needed, even further accentuated by the fact that water is the more difficult to remove the deeper the penetration of water into the web.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] The paper grade of the example is well suited for use as copier or printer paper.

[0026] Today, copier equipment manufacturers recommend the use of a copier paper grade having a basis weight of 80 g / m2. This recommendation aims to secure a sufficient sheet stiffness in the infeed and printing sections of copier / printer equipment. Typically, this kind of paper is surface sized using a furnish having a solids content of about 10% and applied, e.g., 10 g / m2 as a wet film on both sides of the web. Then, the portion of dry weight of size solids is 2 g / m2, whereby the basis weight of the base sheet must be 78 g / m2.

[0027] According to the invention, the internal bond strength is secured by keeping the draw between the press section and dryer section of the papermaking machine lower than 3%, advantageously in the range 1-2%, whereby the internal bond strength required from the base sheet stays good. If the basis weight of the base sheet is lowered to a value of 68-72 g / m2, the compu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
breaking elongationaaaaaaaaaa
speedaaaaaaaaaa
surface sizeaaaaaaaaaa
Login to view more

Abstract

A web of paper or paperboard is manufactured by first forming a base web that is dried on the press section of papermaking machine. The base web is further dried on the dryer section of the papermaking machine and a base web speed differential, or draw, is set between the press section and the first dryer cylinder group of the dryer section, whereupon at least one surface of the web is surface sized. The draw is set to 3% maximum, and a surface size furnish is applied having a solids content of at least 15% of the total amount of size components and liquid in the furnish.

Description

CROSS REFERENCES TO RELATED APPLICATIONS [0001] This application is a U.S. national stage application of international application No. PCT / FI2003 / 000745, filed Oct. 8, 2003, the disclosure of which is incorporated by reference herein, and claims priority on FI 20021804 filed Oct. 9, 2002, and on FI 20022161, filed Dec. 5, 2002. STATEMENT AS TO RIGHTS TO INVENTIONS MADE UNDER FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT [0002] Not applicable. BACKGROUND OF THE INVENTION [0003] The present invention relates to a method for manufacturing paper and paperboard products, the method comprising the steps of monitoring web formation during the manufacturing process and surface sizing the web at least on one side. The method also allows the control of curl in the manufactured product. The invention also relates to a product manufactured by virtue of the method. [0004] In paper manufacture, as factors of increasingly higher importance have arisen a precise adaptation of the properties of the p...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(United States)
IPC IPC(8): D21H21/24D21H21/16D21F11/00D21H23/26D21H27/14G03G7/00
CPCD21F11/00D21H21/16D21H23/26G03G7/0073G03G7/0006G03G7/006G03G7/0066D21H27/14
Inventor LIPPONEN, JUHAGRON, JOHANILMONIEMI, ERKKILACKMAN, KAARLOPAKARINEN, PEKKAJUPPI, KARIAHONEN, PASI
Owner VALMET TECH INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap