Nonwoven webs with enhanced loft and process for forming such webs

Inactive Publication Date: 2014-03-13
PEGAS NONWOVENS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0025]The present invention relates to providing a process of forming a web exhib

Problems solved by technology

The achieved thickness and structure of the resulting material are, however, not suitable for all applications.
In this way it is possible to produce a soft lofty material, however at the cost of a significant loss in strength.
The resulting material achieves a higher loft than with the use of a standard pyramid pattern, the bonding points of which, are similar to a regular rhombus, however softness as measured by the HandleOMeter does not achieve the values achieved in the described solution.
As a result of the complexity of the mix of the above-described characteristics, to the extent softness is considered an attribute of a nonwoven web material, it may elude precise measurement or quantification.
Although several methods for measuring and evaluating material features that are believed to affect softness signals have been developed, there are no standard, universally accepted units or methods of measurement for softness.
It is a subjective, relative concept, difficult to characterize in an objective way.
Because softness is difficult to characterize, it can also be difficult to affect in a predict

Method used

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  • Nonwoven webs with enhanced loft and process for forming such webs
  • Nonwoven webs with enhanced loft and process for forming such webs
  • Nonwoven webs with enhanced loft and process for forming such webs

Examples

Experimental program
Comparison scheme
Effect test

example 1

Comparative Standard Bulky

[0206]The 12 gsm spunmelt type nonwoven batt produced online in a continuous process from polypropylene (Mosten NB425 from Unipetrol), where monocomponent polypropylene filaments with a fibre diameter of 15-25 μm are produced and subsequently collected on a moving belt. To increase strength a patterned calender is used consisting of a pair of heated rollers, where one roller has raised comparative pattern “Standard bulky” (FIG. 4A). The temperature of the calender rollers (smooth roller / patterned roller) is 165° C. / 168° C. and the pressure is 75 N / mm.

example 2

Comparative Standard Bulky

[0207]A 14 gsm spunmelt type nonwoven batt produced online in a continuous process from polypropylene (Mosten NB425 from Unipetrol), where monocomponent polypropylene filaments with a fibre diameter of 15-25 μm are produced and subsequently collected on a moving belt. To increase strength a patterned calender is used consisting of a pair of heated rollers, where one roller has raised comparative pattern “Standard bulky” (FIG. 4A). The temperature of the calender rollers (smooth roller / patterned roller) is 165° C. / 168° C. and the pressure is 75 N / mm.

example 3

Comparative Standard Bulky

[0208]A 15 gsm spunmelt type nonwoven batt produced online in a continuous process from polypropylene (Mosten NB425 from Unipetrol), where monocomponent polypropylene filaments with a fibre diameter of 15-25 μm are produced and subsequently collected on a moving belt. To increase strength a patterned calender is used consisting of a pair of heated rollers, where one roller has raised comparative pattern “Standard bulky” (FIG. 4A). The temperature of the calender rollers (smooth roller / patterned roller) is 168° C. / 171° C. and the pressure is 75 N / mm.

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Abstract

The present invention relates to a process of forming a soft bulky nonwoven web from a batt using thermobonding and to a soft bulky nonwoven web with a bond impression pattern and shape. The process comprises several steps including feeding a batt to a nip between first and second surface of first and second roller, where at least the first of the surfaces comprises spaced apart bonding protrusions surrounded by recessed areas. The bonding protrusions and the bond impression shape in the web exhibit a ratio of the greatest measurable width to the greatest measurable length of at least 1:2.5 and the perimeters thereof comprise a convex portion. The bonding protrusions are symmetric and/or have a certain angle to the machine direction.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a method of producing a nonwoven web material exhibiting improved properties as well as to such a nonwoven material. Such a material may be useful for a number of applications, such as cleaning articles, like wipes or dusters, or in particular for disposable articles, such as disposable absorbent articles.BACKGROUND OF THE INVENTION[0002]It is well known in the industry that the final properties of thermally bonded nonwoven webs can be significantly influenced by an appropriate pattern of bonding points or bonding impressions expressed particularly by the shape and the size of the bond impression as well as the total bond area, and their arrangement in the plane such as in a certain pattern. By selecting appropriate parameters for the pattern, it is possible with the use of the same input material to, for example, produce both a strong compact web resistant against rubbing, as well as a lofty web with an increased softness...

Claims

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Application Information

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IPC IPC(8): D04H3/10
CPCD04H3/10D04H1/544D04H1/56D04H3/14D04H3/147B32B5/022B32B27/12B32B2250/02B32B2262/0253B32B2262/0276B32B2262/04B32B2262/06D04H3/007Y10T428/24479D04H1/541
Inventor KLASKA, FRANTISEKKUMMER, JIRIMECL, ZDENEKKASPARKOVA, PAVLINAXU, HANISELE, OLAF ERIK ALEXANDERDE BEER, ANTONIUS LAMBERTUS JOHANNES
Owner PEGAS NONWOVENS
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