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Process for producing nonwoven with improved surface properties

A surfactant-based, water-based technology for applications in nonwovens, surfactant addition, papermaking, etc., capable of solving even thin spots or holes, surface irregularities, interfering with hydroentanglement of nonwovens, etc.

Active Publication Date: 2018-07-17
ESSITY HYGIENE & HEALTH AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it may result in surface irregularities or even thin spots or holes in the final sheet material, which can negatively affect the sheet properties and performance as well as its appearance
This problem can be reduced by using relatively high levels of surfactants in the foam-forming pulp mixture, but high levels of surfactants hinder the hydroentanglement process
In particular, it has been shown that high levels of surfactants may hinder the water purification in the circulation loop of the water used in hydroentangling, which in turn may interfere with the hydroentangling of nonwovens and thus lead to unsatisfactory bonding

Method used

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  • Process for producing nonwoven with improved surface properties
  • Process for producing nonwoven with improved surface properties
  • Process for producing nonwoven with improved surface properties

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0066] Example 1 (comparative example)

[0067] A nonwoven absorbent sheet material usable as a wipe (e.g. industrial cleaning cloth) was produced by laying down a web of polypropylene filaments on a running conveyor fabric, and then in a headbox Pulp containing wood pulp and polyester staple fibers in a weight ratio of 88:12 and 0.01-0.1 wt.% of nonionic surfactant (ethoxylated fatty alcohol) was applied on a polymer web in a foam forming process Dispersion, introducing a total of about 30 vol. % air (based on total foam volume). The proportion by weight of polypropylene filaments is 25 wt.% based on the dry weight of the final product. The amount is chosen to achieve 55g / m 2 basis weight of the final product. The combined fibrous web is then subjected to hydroentanglement using multiple water jets of increased pressure of 40-100 bar, providing a total energy supply of about 180 kWh / t in the hydroentanglement step, as in CA 841938, pp. 11-12 The description is measured an...

example 2

[0069] Example 2 (the present invention)

[0070] Example 1 was repeated with the only difference that the pulp dispersion was applied in two stages, using two headboxes placed approximately 2m apart from each other along the production line. Formation data and basis weight data for the five samples at the best and worst positions are presented in Tables 1 and 2, respectively, under the heading "Dual Headbox".

[0071] Table 1: Formation results (unit %)

[0072]

[0073] Table 1 shows that when using two headboxes compared to using a single headbox, the formation value of the worst point is significantly reduced (mean value from 3.29 to 1.41%) and the standard deviation is significantly reduced (for the worst point) . Also the difference between worst and best is drastically reduced when using two headboxes compared to one.

[0074] Table 2: Basis weight results (unit g / m 2 )

[0075]

[0076] Table 2 shows that for the worst point the basis weight increases signif...

example 3

[0077] Example 3 (comparative example)

[0078] Example 1 is repeated with the only difference that the amount is chosen so that the basis weight of the final product reaches 80 g / cm 2 . Formation data for 5 different samples of nonwoven fabric at the best and worst positions are presented in Table 3 below, under the heading "Single Headbox", with mean values ​​and standard deviations. Basis weight data for the same samples are presented in Table 4 below, under the heading "Single Headbox", with mean and standard deviation.

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Abstract

A hydroentangled nonwoven sheet material can be produced by a process which comprises: 0) optionally providing a polymer web on a carrier, a) providing an aqueous suspension containing short fibres and a surfactant; b) depositing the aqueous suspension on the carrier, c) removing aqueous residue of the aqueous suspension deposited in step b) to form a fibrous web, b') depositing aqueous suspensionon a surface of the fibrous web formed in step c), c') removing aqueous residue of the aqueous suspension deposited in step b') to form a combined fibrous web, d) hydroentangling the combined fibrousweb, and optionally e) drying the hydroentangled web, and / or f) further processing and finalising the dried, hydroentangled web the web to produce the nonwoven end material. The hydroentangled non-woven sheet material obtainable by this process has a low degree of surface irregularity and contains low residues of surfactants.

Description

technical field [0001] The present invention relates to a method for producing a fiber-containing nonwoven sheet material with minimal surface irregularities and to the sheet material obtainable by this method. Background technique [0002] Absorbent nonwovens are used to wipe up various types of spills and dirt in industrial, medical, office and household applications. They generally consist of a combination of thermoplastic polymers (synthetic fibers) and cellulose pulp for the simultaneous absorption of water and other hydrophilic substances as well as hydrophobic substances (oils, fats). Nonwoven wipes of this type are strong, flexible and soft at the same time, in addition to having ample absorbent capacity. They can be manufactured by wet-laying a pulp-containing mixture on a polymer web, followed by dewatering and hydroentanglement to anchor the pulp to the polymer and finally drying. Absorbent nonwovens of this type and methods for their manufacture are disclosed i...

Claims

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Application Information

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IPC IPC(8): D04H1/4266D04H1/4374D04H1/46D04H1/492D04H1/498D04H3/105D04H5/03D21H27/00D21H27/34D21H27/36D21F11/00D21H27/42D21H21/24D21H21/56
CPCD04H1/4266D04H1/4374D04H1/492D04H1/498D04H3/105D04H5/03D21F11/002D21H5/2685D21H21/24D21H21/56D21H27/002D21H27/34D21H27/36D04H1/465
Inventor M·斯特兰德奎斯特H·阿霍尼米
Owner ESSITY HYGIENE & HEALTH AB
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