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Process for producing super high bulk, light weight coated papers

a coating paper and super high bulk technology, applied in papermaking, non-fibrous pulp addition, press section, etc., can solve the problems of poor gloss paper quality, poor quality of coated paper,

Inactive Publication Date: 2004-05-27
VERSO PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As paper stock is made lighter, however, the problem of "show-through" and a limp "feel" arise substantially precluding use of such lighter paper in magazines, brochures, annual reports, advertising pieces, direct mail and like promotional materials, especially in high quality magazines.
Such lower gloss paper is not acceptable for many publication purposes, such as magazines where lightweight high bulk paper, with high gloss and good print gloss is desired.
The prior art does not teach a process of making high bulk, lightweight coated paper having high stiffness, opacity and brightness that may be used as a "low end" offset paper.

Method used

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  • Process for producing super high bulk, light weight coated papers
  • Process for producing super high bulk, light weight coated papers
  • Process for producing super high bulk, light weight coated papers

Examples

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examples

[0062] Basepaper

[0063] The effect of five 32 g / m.sup.2 basepaper was examined using the following types of basepaper: B1, B1 / hi-mechanical, B4 and two hot soft pre-calendered basepaper (B1 / precalendering and B1 / hi-mechanical / precalen-dering). The properties of the B1 and B1 / hi-mechanical basepaper are shown in Table 1. B4 basepaper is similar to B1 basepaper, except that the B4 has less addition of wet-end starch in the sheet. Precalendering basepaper has smoother surfaces than non-precalendered basepaper, but its caliper is reduced. Table 1 shows that by increasing TMP content from 30% to 60% the total mechanical pulp content increases from 60% to 70%, while still maintaining good paper machine runnability. Table 2 shows that by increasing the amount of mechanical pulp from 60% to 70% the caliper increases from 2.85 to 3.03, while roughness and porosity are slightly increased.

[0064] Coating Formulations

[0065] The "control" coating is a typical No.5 lightweight coating, consisting o...

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Abstract

The present invention relates to a process of manufacturing a high bulk, low weight paper product produced by using a high level of groundwood containing sheet, blade coating with specifically formulated coatings then passing the paper web between two extended-nip calenders, one calender for each side of paper. As a result, densification of the resulting coated paper product is reduced, while maintaining stiffness and opacity comparable to heavier weight sheets.

Description

[0001] The present invention relates to a process of manufacturing a high bulk, low weight paper product having stiffness and opacity comparable to heavier weight sheets, the process consisting of using a high level of groundwood containing sheet, coating with specifically formulated coatings then passing the paper web through two extended-nip calenders, using one nip for each side of the paper.BACKGROUND OF INVENTION[0002] Due to the continue increase in bulk postage rates, a significant demand has been created for lighter paper stock suitable for magazine use. As paper stock is made lighter, however, the problem of "show-through" and a limp "feel" arise substantially precluding use of such lighter paper in magazines, brochures, annual reports, advertising pieces, direct mail and like promotional materials, especially in high quality magazines.[0003] Attempts to make lightweight, high bulk paper have been made utilizing higher levels of groundwood and coating the paper web with a c...

Claims

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Application Information

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IPC IPC(8): D21H19/42D21H23/34D21H25/12
CPCD21H19/42D21H25/12D21H23/34D21H19/36D21H19/52D21H19/00
Inventor CHING, BOBWANG, XIAO-QINVEVERKA, PETER
Owner VERSO PAPER
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