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Composite nonwoven its use and method of manufacture

a technology of composite nonwovens and nonwoven fabrics, which is applied in the direction of weaving, woven fabrics, non-woven fabrics, etc., can solve the problems of reducing absorption properties, limited use of hydrophobic polypropylene fibers in nonwovens to be used as substrates for wiping articles, and reducing liquid absorption properties, so as to improve liquid absorption properties and improve liquid release properties

Inactive Publication Date: 2005-04-28
SUOMINEN NONWOVENS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] The composite nonwoven according to the invention is intended to be used as a substrate for wiping articles, especially wet wipes. The said composite nonwoven material has improved liquid absorption properties, as well as improved liquid release properties.

Problems solved by technology

While nonwoven substrates comprising viscose and polyester fibers provide good liquid absorption and retention characteristics, these substrates release typically less than 50% of the moisturising liquid during a wiping action.
The use of hydrophobic polypropylene fibers in nonwovens to be used as substrates for wiping articles is limited as the liquid absorption properties decrease when the amount of polypropylene fibers increases.
The hydrophobic nature of a nonwoven material containing PP fibers thus results in non-optimal cleaning properties of the nonwoven used as a wiping article.
The liquid absorption capacity and absorption rate of the nonwoven are low, resulting also in a relatively poor drying ability of the nonwoven during a wiping action.

Method used

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  • Composite nonwoven its use and method of manufacture
  • Composite nonwoven its use and method of manufacture
  • Composite nonwoven its use and method of manufacture

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0068] The liquid porosimeter was employed in both advancing and receding modes. During the advancing run, the sample was wetted by the test liquid and the receding part was used to determine the liquid release properties. Cumulative volumes of the filled pores are shown in FIG. 2. The pore radius range 5-50 μm corresponds to the pressure range 13200-1320 Pa. Cumulative volumes of filled pores at 10, 20, 30, 40 and 50 μm as a percentage (correspond to the pressures of 6600, 3300, 2200, 1650 and 1320 Pa) are presented in Table III. The selection of this pressure range is based on the estimate of pressures used during the wiping procedure in different wiping applications (baby wet wipe, household etc.). From FIG. 2 and Table III it is seen that the amount of filled pores in the composite structure is smaller than in the reference sample. Thus, according to the liquid porosimeter measurements, the release properties of the composite structure are better as compared to the reference sam...

example 2

[0070] Wiping Test (Wet Sample)

[0071] The wiping test with wet samples indicated the difference between the composite structure and the reference sample (FIG. 4). The liquid release is higher for the composite structure than for the reference sample. For example, after three consecutive releases the composite structure retained about 10% less liquid than the reference sample.

[0072] Wiping Test (Dry Sample)

[0073] The results from the wiping test with dry samples showed that the wiping efficiency was better for the composite structure (FIG. 5). The composite structure is capable of absorbing 12.4-16.7% more liquid during the wiping test than the reference sample.

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Abstract

The invention concerns a composite nonwoven formed from fibrous layers bonded together by entanglement of fibers of the layers, wherein the fibrous layers comprise first and second outer layers each comprising a mixture of hydrophobic and hydrophilic fibers, as well as an intermediate layer of hydrophobic fibers sandwiched between the first and the second outer layers, the weight ratio between the hydrophobic and hydrophilic fibers in the first and the second layers being 20:80 to 80:20. The invention also concerns the manufacture of the nonwoven, as well as its use, especially as a wet wipe.

Description

FIELD OF THE INVENTION [0001] The present invention relates to composite nonwovens, to their use and to a method of manufacture of the composite nonwovens. More particularly, it discloses a new entangled composite nonwoven material comprising at least three layers. The nonwoven material according to the invention can be used as a substrate for wiping articles, especially for use as a substrate for wet wipes, where good liquid absorption and release properties are needed. BACKGROUND OF THE INVENTION [0002] In hydroentanglement of a fiber web, fine, high-speed water jets bond the fiber web in a similar way to the needles in a needlepunching process. These high-pressure water jets cause a rearrangement of the fibers in all three directions of the structure and as a consequence thereof significant bonding without the use of added binders or additional bonding (e.g. thermal) can be achieved. In a widely applied process, a carded web is placed on a moving conveyor belt, which transports t...

Claims

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Application Information

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IPC IPC(8): D04H13/00
CPCD04H1/425D04H1/4258D04H1/4266D04H13/00D04H1/4374D04H1/498D04H1/4291Y10T442/698Y10T442/689
Inventor BERGHOLM, HEIKKILAMPULA, ERKKIRAHKOLA, MARIHULDEN, MARGARETATIIRIKAINEN, JOHANNA
Owner SUOMINEN NONWOVENS
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