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Compositions

a technology of compositions and cellulose, applied in the field of compositions, can solve the problems of high energy consumption of microfibrillating cellulose methods, and the commercially viable process for preparing microfibrillating cellulose on an industrial scale has been elusiv

Inactive Publication Date: 2013-10-24
FIBERLEAN TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a paper product that includes microfibrillated cellulose and inorganic particulate material compositions. The paper product has improved strength, tear strength, burst strength, sheet light scattering coefficient, porosity, and z-direction internal bond strength. The invention also includes a coated paper product that has improved gloss, stiffness, and barrier properties. The paper making composition has a lower cationic demand and is devoid of retention aids. The paper product also has a lower formation index. Overall, the technical effect of the present invention is to provide a stronger and more durable paper product with improved properties.

Problems solved by technology

Current methods of microfibrillating cellulosic material require relatively high amounts of energy owing in part to the relatively high viscosity of the starting material and the microfibrillated product, and a commercially viable process for preparing microfibrillated cellulose on an industrial scale has hitherto before proved elusive.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Co-Processed Filler

[0231]Composition 1

[0232]The starting materials for the grinding work consisted of a slurry of pulp (Northern bleached kraft pine) and a ground calcium carbonate (GGC) filler, Intracarb 60™, comprising about 60% by volume of particles less than 2 μm. The pulp was blended in a Cellier mixer with the GCC to give a nominal 6% addition of pulp by weight. This suspension, which was at 26.5% solids, was then fed into a 180 kW stirred media mill containing ceramic grinding media (King's, 3 mm) at a medium volume concentration of 50%. The mixture was ground until an energy input between 2000 and 3000 kWht−1 (expressed on pulp alone) had been expended and then the pulp / mineral mixture was separated from the media using a 1 mm screen. The product had a fibre content (by ashing) of 6.5 wt %, and a mean fibre size (D50) of 129 μm as measured using a Malvern Mastersizer S™. The fibre psd steepness (D30 / D70×100) was 31.7.

[0233]Composition 2

[0234]The preparation o...

example 2

Preparation of Basepaper

[0235]A blend of 80% by weight of eucalyptus pulp (Södra Tofte) refined to 27° SR at 4.5% solids and 20% by weight of softwood kraft (Sodra Mönsterås) pulp refined to 26° SR at 3.5% solids was prepared in pilot scale equipment. This pulp blend was used to make a continuous reel of paper using a pilot scale paper machine running at 800 m min−1. The stock was fed to the twin wire roll former via a 13 mm slot from a UMV10 headbox. The target grammage of the paper was 75 gm−2 and fillers and loading levels are set out in Table 1.

TABLE 1Uncoated basepaper properties before calenderingFillerIC60 controlComp. 1Comp. 2Loading, wt %19.927.827.928.5Grammage,74.574.177.871.9gm−2Tensile strength34.026.526.929.4Nm g−1Bendtsen porosity,735749367296cm3 min−1

[0236]A 2-component retention aid system was used consisting of a cationic polyacrylamide, Percol 47NS™, (BASF) at a dose of 300-380 g t−1 and a microparticle bentonite, Hydrocol SH™ at 2 kg t−1. The press section consis...

example 3

[0239]The coated papers of Example 2 were then tested for moisture vapour transmission rate (MVTR) over 2 days. The method was based on TAPPI T448 but used silica gel as the dessicant and a relative humidity of 50%. The amount of moisture transferred through the paper was measured over the first and second days and then averaged. Results are summarized in Table 2.

[0240]The papers were also tested for oil resistance using an oil-based solution of Sudan Red IV in dibutyl phthalate using an IGT printing unit. A controlled volume of the fluid (5.8 μl) was applied to the paper using a syringe and passed through the printing nip at a pressure of 5 kgf and a speed of 0.5 m s−1. The area covered by the fluid stain was measured using image analysis and used as an indication of the ability of the coating to resist penetration by oil-based fluids. Results are summarized in Table 2.

TABLE 2Coated basepaper propertiesFillerIC60 controlComp. 1Comp. 2Loading, wt %19.927.827.928.5MVTR44.140.440.436....

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Abstract

Compositions such as filled and coated papers may include microfibrillated cellulose and inorganic particulate material.

Description

FIELD OF THE INVENTION[0001]The present invention relates to compositions, such as filled and coated papers, comprising microfibrillated cellulose and inorganic particulate material.BACKGROUND OF THE INVENTION[0002]Inorganic particulate materials, for example an alkaline earth metal carbonate (e.g. calcium carbonate) or kaolin, are used widely in a number of applications. These include the production of mineral containing compositions which may be used in paper manufacture, paper coating, or polymer composite production. In paper and polymer products such fillers are typically added to replace a portion of other more expensive components of the paper or polymer product. Fillers may also be added with an aim of modifying the physical, mechanical, and / or optical requirements of paper and polymer products. Clearly, the greater the amount of filler that can be included, the greater potential for cost savings. However, the amount of filler added and the associated cost saving must be bal...

Claims

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Application Information

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IPC IPC(8): D21H17/63
CPCD21H17/63D21H17/25D21H19/38D21H19/52Y10T428/31703Y10T428/31982Y10T428/31993D21H11/04D21H19/22D21H19/34D21H23/48D21H27/10
Inventor HUSBAND, JOHN CLAUDESVENDING, PERSKUSE, DAVID ROBERT
Owner FIBERLEAN TECH LTD
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