Method for adding chemicals to a nonwoven material

Inactive Publication Date: 2005-06-23
SCA HYGIENE PROD AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018] In the embodiment where the chemical additive comprises a softening agent, penetration is especially desirable since the bulk properties are enhanced as the hydrogen bonds at the fiber-fiber intersections are broken in the material or at least softened or loosened up by the softening chemicals. Decreasing or reducing the inter-fiber bonding within the web when the nonwoven web comprises cellulose fibers to a certain degree can thus increase the softness and bulk. But also the stiffness of the material will be lower as the softeners will influence the fibers throughout the material. Also for other chemical additives such as wet strength agents, the effect of the additives will be greater since all of the fiber to fiber intersections are treated and not only the surface of the nonwoven material web.
[0019] Wet strength agents are primarily added to reduce the linting. The expression “low linting” means a low release of fibers from a web, i.e. that a wipe, for example, does not release fibers onto the object that is wiped. Wet

Problems solved by technology

If fibers are released from the nonwoven material surface or from the bulk they will during use eventually end up on the object that is wiped, something highly undesirable in many applications.
One of the disadvantages of adding chemicals in the wet end of the manufacturing process is that the retention of different chemicals added in the wet end onto the fibers is generally relatively poor.
However, the low strength of the bond between the added chemical and the fiber does not withstand the hydroentanglement process step.
The enriched chemicals in the hydroentanglement water cleaning system will cause a number of problems.
For example, filters could be clogg

Method used

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  • Method for adding chemicals to a nonwoven material
  • Method for adding chemicals to a nonwoven material

Examples

Experimental program
Comparison scheme
Effect test

Example

[0050] In Example 1, two different softening agents which enhances bulk softness and surface smoothness were evaluated, Berocell 589 and XP 7026 supplied by Eka Chemicals. The Berocell 589 is an additive in the manufacture of fluff pulp and is a mixture of cationic and nonionic surfactants and comprises alkyl-benzyl-dimethyl ammonium chloride and fatty alcohol ethoxylate. XP 7026 is a softener for tissue and also a mixture of cationic and nonionic surfactants and comprises benxyl-dimethylammonium chloride. The concentration of the softening agents in the hydroentanglement water was 0.07%, 0.14% and 0.21% by volume. This would result in a corresponding concentration of about maximum 0.2%, 0.4% and 0.6% by weight in the fiber material, if a complete exchange to the hydrojet liquid occurs.

[0051] As the spunlace materials were treated with a softening agent, the experience of a much softer material in the hand was obtained. Softness in relation to the drapability stiffness and the tens...

Example

Example 1b

[0055] In order to even more show the surprising results and effects of the method in accordance to the invention, it was also compared to results achieved by conventional technique where the chemical additive is added in the wet end.

[0056] The reference used and shown in table 4 has of course the same corresponding nonwoven material, fiber composition and basis weight as used in example 1a as well as in example 2. The reference is thus a nonwoven web with a basis weight of about 87 g / m2 consisting of 60% cellulose pulp fibers and 40% polyester fibers (T-100) supplied by KOSA, 1.7 dtex, 19 mm long. The web was prepared by wet laid technology in a dynamic sheet former and subsequently bonded by hydroentanglement at high pressure of about 100 bar on both sides and about 300 kWh / ton at a speed of about 140 m / min.

[0057] For the first sample no chemical was added to the wet end or to the hydroentanglement water. In the second sample a softening agent was added to the slurry....

Example

Example 2

[0059] In the second example the chemical tested and evaluated was a wet strength resin, Kenores 1445, a polyamidoamine-epichlorohydrin resin (PAE), supplied by EKA chemicals.

[0060] Three different dilute solutions of the wet strength resin in the hydrojet liquid were used corresponding to 0.07%, 0.14% and 0.21% by volume. This would result in a corresponding concentration of about maximum 0.2%, 0.4% and 0.6% by weight in the material, if a complete exchange to the dilute solutions used in the hydrojet treatment occurs. The hydrojet treatment was done at three different hydrojet pressures corresponding to 20, 40 and 60 bars.

[0061] When the spunlace nonwoven materials were treated with the wet strength resin, a significant reduction of linting was observed. The wet linting method used to characterize the linting was the bi-axial shake linting. The results of the bi-axial linting are shown for the wetlaid spunlace material hydrojet treated with Kenores 1445 wet strength re...

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Abstract

A method of adding a chemical additive to a fiber web of nonwoven material including cellulose pulp fibers and synthetic fibers and/or filaments. A hydrojet liquid including the chemical additive is used in at least one hydrojet treatment step, which includes at least one vacuum collecting box. The hydrojet liquid is applied to the fiber web for penetrating the fiber web at a pressure of at least 5 bar but not more than 100 bar, in such a manner so that the chemical additive is penetrated into the fiber to fiber intersections of the nonwoven material.

Description

CROSS REFERENCE TO THE RELATED APPLICATION [0001] This application claims the 35 USC 119(e) benefit of prior U.S. Provisional application Ser. No. 60 / 530,906 filed on Dec. 22, 2003.TECHNICAL FIELD [0002] The invention relates to a method for adding a chemical additive to a fiber web of nonwoven material comprising cellulose pulp fibers and synthetic fibers and / or filaments. BACKGROUND OF THE INVENTION [0003] Typical properties of nonwoven include the ready ability to absorb tensile stress energy, their drapability, and good textile-like flexibility, properties that are frequently referred to as bulk softness, a high surface softness, and a high specific volume with a perceptible thickness. Further desirable properties are as high a liquid absorbency as possible and, depending on the application, a suitable wet and dry strength as well as an attractive visual appearance of the outer product surface. These properties, among others, allow nonwoven to be used for example as cleaning wip...

Claims

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Application Information

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IPC IPC(8): D04H1/46D21H11/00D21H13/24D21H21/18D21H21/24D21H23/50D21H25/00
CPCD04H1/465D21H13/24D21H25/005D21H21/24D21H23/50D21H21/18D04H1/49
Inventor STRALIN, ANDERSRUCINSKA, EWASTRANDQVIST, MIKAEL
Owner SCA HYGIENE PROD AB
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