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Method to manufacture paper

Inactive Publication Date: 2006-11-23
SAMMARCO TIMOTHY S +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018] Another aspect of the present invention is a method of making a paper substrate by contacting both the plurality of fibers from hardwood species, softwood species or mixtures thereof that are greater than or equal to 75 μm in length on average

Problems solved by technology

Normally retention aids are long chained polymeric compounds that flocculate the furnish and enhance filler-fiber “attachment.” However, high flocculation levels, caused in part by retention aids, lead to non-uniformity in the web and poor paper formation.
However, this procedure results in increases in capital and operating costs due to the treatment of larger pulp volumes.
These chemicals can lead to problems in their subsequent use, such as quenching of residual sizing and OBAs when exposed to the high pH environments such as those required during the start of PCC formation.
In addition, the utilization of the highly variable streams containing the “fines” can lead to problems with uniformity within a paper substrate made therefrom.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0103] Two paper substrate handsheet sets were made containing varying amounts of ash. Handsheet Set 1 contained SaveAll fiber fines with high surface area, while the other Handsheet Set 2 contained unrefined fibers. FIGS. 1 and 2 show a plot of the Sheffield smoothness, in Sheffield Units (SU), of the ID and NS sides, respectively, of the paper substrates versus the wt % ash contained in that paper substrate. There is a smoother surface at equal ash content for the paper substrates containing the unrefined pulp than those paper substrates containing highly refined and / or recycled and / or SaveAll pulp at the same ash content.

example 2

[0104] A SaveAll fiber fine sample was collected from a mill stream and contained a fluorescence that contributed 46 CIE-Whiteness points. When this sample was mixed with Ca(OH)2 and then reacted with CO2 to form CaCO3 to form a fiber-CaCO3 complex, the sample contributed 23 CIE-whiteness points, a decrease of 23 CIE-Whiteness points. This decrease in residual OBA efficiency is attributable to quenching of the residual OBA in SaveAll pulp because of the pH increase to >12 when the Ca(OH)2 is added. The table of FIG. 3 further demonstrates fluorescent data, as measured by CIE-Whiteness, SaveAll fiber fines pulp to the same pulp after forming a fiber-CaCO3 complex. The addition of Ca(OH)2 to the fibers caused the pH to increase above 12 and, as the data shows in FIG. 3, caused the residual OBA to become less efficient.

example 3

[0105] The JEP studies that-were targeted for characterizing the fiber-filler complex that is needed to meet the JDA goal (see FIG. 2) will be summarized in this section.

[0106] JEP-3: The goal of this study was to identify the best shape and size (i.e., morphology) of the PCC to be attached in a fiber-filler complex in order to maximize bulk and sheet strength. SMI's 4G process was used to produce these samples, with the goal of producing fiber-filler complexes with the PCC component matching the new SMI “3G” products (e.g., Megafil-4000, UltraBulk-II, Albacar-SP, etc.). FIG. 4 summaries the physical test properties of the samples and compares them relative to the Saillat Megafil-2000 (aka, Megafil-S) control sample. As shown in this figure, the UltraBulk-II composite had the best bulk and stiffness opportunity while also reducing the demand for AKD sizing and OBA, relative to Megafil-S. Unfortunately, due to the nature of the “4G” process, which involved pre-carbonating the PCC to...

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Abstract

The present invention relates to a paper or paperboard substrate containing fiber-filler complexes as well as methods of making and using the same.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a paper or paperboard substrate containing fiber-filler complexes as well as methods of making and using the same. BACKGROUND OF THE INVENTION [0002] Inorganic material such as precipitated calcium carbonate (PCC) ground calcium carbonate (GCC), clay and talc are used extensively as fillers in the paper making process. Filler loading levels of 12-25wt % are typical in current paper making strategy to improve optical properties of the paper such as brightness and opacity. In some instances, the economics of substituting expensive fiber with inexpensive filler lends added incentive. [0003] To insure that the fillers remain with the fiber web and ultimately with the paper product, retention aids are used. Normally retention aids are long chained polymeric compounds that flocculate the furnish and enhance filler-fiber “attachment.” However, high flocculation levels, caused in part by retention aids, lead to non-uniformity in...

Claims

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Application Information

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IPC IPC(8): D21H11/14D21H17/66D21H15/06D21H17/67D21H17/70D21H21/52
CPCD21H15/06D21H17/67D21H21/52D21H17/70D21H17/675
Inventor SAMMARCO, TIMOTHY S.SWERIN, AGNEFROASS, PETER
Owner SAMMARCO TIMOTHY S