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Compressed absorbent tampon

A technology of cotton plugs and fiber fabrics, applied in absorbent pads, tampons, medical science, etc., can solve problems such as damage to fibers, damage to processing equipment, and decline in absorption capacity

Inactive Publication Date: 2005-09-28
MCNEIL PPC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This energy requirement also limits the ability to industrially produce increased density cotton plugs
High compressive forces can damage processing equipment and adversely affect plug performance by damaging the fibers in the plug structure
This fiber damage results in poor product expansion and reduced absorbency

Method used

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  • Compressed absorbent tampon
  • Compressed absorbent tampon
  • Compressed absorbent tampon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A mixture of 75% by weight of 3 denier Danufil® VY trilobal viscose rayon fibers and 25% by weight of 3 denier Danufil® V viscose rayon fibers was opened using standard fiber opening and carding equipment. Pine, both fibers were obtained from Acordis Ltd., Spondon, England. A fixed amount of fiber compound (weight W about 2 grams) was introduced into a stainless steel mold having a cylindrical cavity (cross-sectional area A about 5 cm2). Compress the fibrous body using a cylindrical plunger sized to match the cylindrical cavity and a standard laboratory press. To heat the samples, the mold and plunger were heated in an oven set to the target temperature. After enough time has passed for the mold and plunger to reach oven temperature, place the fiber in the cavity and heat the mold, plunger and fiber for another 3 minutes to bring the fiber to oven temperature. Remove the heated assembly from the oven and place between the platens of a laboratory press. Apply pressure...

Embodiment 2

[0060] 75% by weight of 3 denier Danufil® V viscose rayon fibers obtained from Acordis Ltd. (Spondon, England) and 25% by weight of 3 denier T obtained from KoSa, (Houston, Texas, USA) were used. The mixture of -224 polyester fiber repeats the process of embodiment 1. Also, the measurement results at each temperature and pressure are listed in Table 2.

[0061] temperature

[0062]These data indicate that preheating the fibers at a temperature of at least about 45°C and maintaining the heat during pressing results in significantly greater dimensional stability than pressing the same fibers at room temperature. These data further demonstrate that significantly higher plug densities can be obtained at lower pressures when the fibers are preheated. This tendency is more pronounced at temperatures greater than about 60°C. But for thermoplastic fibers, such as polyester fibers, this preheating method is limited to prevent exceeding its yield point, causing permanent de...

Embodiment 3

[0064] Different blends of 3 denier Danufil V viscose rayon fibers obtained from Acordis Ltd. (Spondon, England) and 3 denier T-224 polyester fibers obtained from KoSa, (Houston, Texas, USA) were used Material repeats the process of embodiment 1. However, in this series, the temperature was kept at 75°C while the fiber ratio was different. The measured results for each mix and pressure are listed in Table 3.

[0065] table 3

[0066] peak pressure

[0067] These data show that preheating the fibers at a temperature of about 75°C and maintaining the heat during pressing provides significant dimensional stability, even in larger fibers with a large proportion of resilience, such as polyester .

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Abstract

A novel process for forming a compressed tampon includes the steps of forming an open structure comprising at least about 5 wt-% of cellulosic materials; heating the open structure to a temperature of at least about 40 DEG C; compressing the heated open structure to form the compressed tampon; and releasing the compressed fibrous tampon from compression. Surprisingly, both the force required for compression and the degree of over-compression are significantly reduced when the fibrous web is heated prior to compression. Indeed, what we have found is that heating the fibrous web prior to compression into the tampon form provides a more consistent, dimensionally-controlled product. It also requires lower compression forces to achieve a dimensionally stable product with reduced fiber damage.

Description

[0001] Related Application Cross Reference [0002] This application is related to the following pending application: US Patent Application Serial No. 10 / 179,430, filed June 25, 2002, entitled "Pressed Absorbent Fabric" (Attorney Docket No. PPG-842). field of invention [0003] The present invention relates to methods and apparatus for forming densified structures using less pressure. The method includes heating the open structure prior to pressing, the apparatus including the heating unit. Background of the invention [0004] Forming the absorbent structure by compression provides sufficient absorbent capacity for a product of suitable size. Absorbent structures include dressings, diapers, sanitary napkins, tampons and interlabial devices. [0005] Many absorbent structures, such as cotton plugs, can be given shape stability by slightly overcompressing the structure and allowing it to recover or expand to the desired size. It is also possible to heat set the structure. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L15/16A61F13/20
CPCA61F13/2085
Inventor A·L·琼斯L·-H·罗伊H·纽耶恩J·E·罗勒E·H·塞勒
Owner MCNEIL PPC INC