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Treated kraft pulp compositions and methods of making the same

A technology of sulfate and pulp, applied in the direction of pulping with acid salts/acid anhydrides, pulping with halogen compounds, fiber raw material treatment, etc., can solve the problems of increasing the cost of rayon fibers, and achieve the effect of improving reactivity

Active Publication Date: 2015-07-01
WEYERHAEUSER NR CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The processing required to produce high alpha pulp adds significantly to the cost of rayon fibers and products made from them

Method used

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  • Treated kraft pulp compositions and methods of making the same
  • Treated kraft pulp compositions and methods of making the same
  • Treated kraft pulp compositions and methods of making the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] Example 1: Protocol for Standard Reactivity Test

[0116] In this example, the protocol for the standard reactivity test (based on the Chinese national standard test FZ / T50010.13) is described.

[0117]Weigh 7.7 grams of pulp (oven dry weight) and place the pulp in a Teflon bottle (250 mL). Add 180.5 mL of 13.7% NaOH to the bottle. A stirrer with a fitted lid was inserted and the pulp suspension was stirred at 2000 RPM for 5 minutes. Cap the bottle. Shake by hand to disperse possible fiber bundles at the bottom of the bottle (invert the bottle several times). The pulp suspension was then stirred for an additional 2 minutes at 2000 RPM.

[0118] Remove the stirrer with the fitted lid and transfer the bottle to a fume hood. Add 4.0 mL of carbon disulfide (CS 2 ). Cap the bottle (on timer: zero hour). crank.

[0119] The bottle was clamped to a Burrell wrist action shaker with 4 clamps (can handle 4 vials simultaneously) and the lever arm set to 7.5, and the bot...

Embodiment 2

[0121] Example 2: Protocol for Modified Responsiveness Test (MRT)

[0122] Since treated kraft pulp is not a dissolving pulp, its reactivity is generally low to moderate compared to dissolving pulp. To assess its suitability for viscose applications a modified reactivity test was used. The procedure for improving reactivity was the same as the laboratory reactivity test described in Example 1, except that 10 mL of CS 2 And there is no ripening time after 4 hours shaking. Modified reactivity was defined as the adulterant volume in mL that flowed through the filter within the first 1 minute. The volume may range from 0 to about 200 mL.

Embodiment 3

[0123] Embodiment 3: SEM fiber segment test

[0124] After performing the MRT test, the filter was placed in water to diffuse out residual solvent before drying the filter in air, exposing possible undissolved fiber segments. Observe the filter drier with fiber segments under SEM (scanning electron microscope) at magnifications of 100, 500 and 2000, observe the area with the most fiber segments and count the fiber segments (from 100 magnification) to calculate the units area of ​​fiber segments. Samples with high reactivity may not have residual fibers on the filter. Samples with poor reactivity may have more than 11 or 20 fiber segments on the filter. In all experiments, undissolved fiber segments remaining on the filter were identified as latewood. Thus, poorly processed latewood is mainly responsible for the poor reactivity.

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Abstract

Compositions including treated Kraft pulp, useful for making rayon fibers, having a lower degree of polymerization, a high R18, a low hemicellulose content, and high reactivity, are described. Methods of making the compositions are also described.

Description

technical field [0001] The present invention provides treated kraft pulp compositions, blends comprising said treated kraft pulp compositions, methods of making said treated kraft pulp compositions and blends, and Fibers and nonwovens made from the compositions. Background technique [0002] Cellulose is a polymer of D-glucose and is a structural component of plant cell walls. Cellulose is particularly abundant in tree trunks, from which it is extracted, turned into pulp, and subsequently used to make a variety of products. Rayon is the name given to the fiber form of regenerated cellulose, which is widely used in the textile industry to make garments and articles of nonwoven material. In one method of producing rayon, the viscose process, cellulose is first soaked in a mercerizing-strength caustic soda solution to form alkaline cellulose. It is reacted with carbon disulfide to form cellulose xanthate, which is then dissolved in dilute caustic soda solution. After filtra...

Claims

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Application Information

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IPC IPC(8): D21C3/18D21C3/04D21C3/00D21C1/08D01F2/00D01F8/02
CPCD21C9/144D01F2/00D01F2/08D01F8/02D21C9/1026D21C9/147D21H11/04D21C9/1057D21C9/123D21H13/08D21H21/08
Inventor 罗孟奎万卡塔·兰加纳坦·帕塔萨拉蒂
Owner WEYERHAEUSER NR CO
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