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Fibers for spunlaced products

Inactive Publication Date: 2005-12-22
WESTLAND JOHN A +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] This use of this long fiber fraction has a number of benefits when compared to using the entire pulp material. The energy needed to fiberize a pulp sheet or bale having only a long fiber fraction is less than the energy required to fiberize a pulp sheet or bale of the prefractionated pulp. There is less loss of fiber in the hydroentangling process when only the long fiber fraction is used giving a more efficient process. The process is also more efficient because with the reduced amount of fines and short fibers being recycled through the process there is less time needed to clean and maintain filters. The airlaced product is improved due to greater adhesion between the long fibers and the non-woven web.

Problems solved by technology

Cellulosic pulp fibers may be used in the formation of spunlaced or airlaced mats A problem is that the fines or short fibers normally found in cellulosic pulp reduce the efficiency of the process.
Another problem is that the fines and short fibers that remain in the mat do not become attached to the non-woven web and may dust from the formed product.

Method used

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  • Fibers for spunlaced products

Examples

Experimental program
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Embodiment Construction

[0016]FIG. 1 shows an apparatus for spunlacing a mat of fibers. The mat 10 is carried onto a conveyor 12 and passes under a series of water jets 14, 16, 18 and 20. The water jets are usually at increasing water pressure. There is a vacuum chamber 22 underneath the conveyor 12. The water from the jets 14, 16, 18 and 20 pass through the mat 10 entangling the fibers. The water is pulled from the mat by the vacuum in chamber 22. The mat of entangled fibers 10′ is transported into the dryer section 24 and dried. Dryer cans 26 are shown. The mat is then rolled up or boxed for shipment.

[0017]FIG. 2 shows airlacing. The apparatus would be the same as the apparatus in FIG. 1. The difference between FIGS. 1 and 2 is the web 30. The water jet 32, which is one of a series of water jets, displaces the fibers in the mat 10″ downwardly and entangles the fibers with the web 30. The composite web is then dried as shown in FIG. 1.

[0018] The pulp fibers that may be used are mechanical pulp fibers, t...

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Abstract

Fractionated cellulosic fibers having a length weighted average fiber length of at least 2.4 mm and less than 2% by weight of fines. In another embodiment the fractionated cellulosic fibers have a length weighted average fiber length of at least 3.5 mm. In another embodiment the fractionated cellulosic fibers have a length weighted average fiber length in the range of 2.4 mm to 3.8 mm. The fibers may be used in spunlacing or airlacing.

Description

BACKGROUND OF THE INVENTION [0001] The oldest technique for consolidating a web is mechanical bonding. The fibers are entangled to give strength to the web. One method of entangling the fibers is spunlacing. Spunlacing is also known as hydroentanglement, jet entanglement, water entangled, hydraulically needled or hydraulically loomed. In spunlacing high pressure jets of water strike a web so that the fibers in the web become entangled and form a nonwoven web. The jets are usually perpendicular to the web but may be angled in order to provide different properties to the web. [0002] The web may be formed by airlaying the fibers onto a moving belt to form a mat and passing the mat under a series of high pressure jets that entangle the fibers. The fibers may be blended or two or more webs may be airlaid before the spunlacing step. [0003] There are variations on spunlacing. One variation is airlacing. In airlacing, a mat of fibers is airlaid onto a nonwoven web and the fibers in the air ...

Claims

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Application Information

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IPC IPC(8): D04H1/46D04H13/00D21C9/08D21F11/00
CPCD04H1/465D21F11/00D04H13/005D04H1/425D04H1/495
Inventor WESTLAND, JOHN A.NEOGI, AMAR N.
Owner WESTLAND JOHN A
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