Highly absorbent composite sheets and methods of manufacturing the same
a composite sheet and high absorbency technology, applied in the direction of weaving, synthetic resin layered products, non-fibrous pulp addition, etc., can solve the problems of high cost of transportation, limited amount of non-woven fabric wound up on the roll, complex process-wise, and high initial investment cos
Inactive Publication Date: 2003-06-19
DSG INT LTD
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
This approach results in a highly absorbent composite sheet with improved tensile strength and thickness, reducing transportation and handling costs while maintaining the bulkiness and absorbency of the material.
Problems solved by technology
If such bulky non-woven fabric is supplied in a bulky wound-up roll from a non-woven fabric manufacturer, however, the transportation would be much costly and the amount of non-woven fabric wound up on roll would be greatly limited.
In such cases, it is conceivable to directly link a step of manufacturing a non-woven fabric to a step of having the non-woven fabric hold SAP, and there is an example in commercial practice of linking a step of manufacturing a thermally bonded non-woven fabric to a step of having the non-woven fabric hold SAP, which may be, however, complicated process-wise and costly initial-investment-wise.
But dust may be generated or SAP powder moves inside an absorbent member, which is not desirable.
Such method has a serious inherent limitation in that the fiber concentration is too low and the manufacturing cost becomes high.
In general, a non-woven fabric is bulkiest when it is in an unbonded web and loses its bulkiness when it is finally made into a non-woven fabric.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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[0031] (Manufacturing of Unbonded Web)
[0032] In the present invention, a non-woven fabric is bonded by means of a bonding agent which co-exists with SAP, so that if a web is manufactured it is sufficient for the manufacturing of a non-woven fabric; that is to say, such steps of bonding, drying and heat treating of a non-woven fabric are not required. The web can be used whether it is dry or wet if manufactured by a wet method.
[0033] It is very important how bulky such unbonded web is prepared, and its strength is sufficient if it does not break when transported in roll or net. For example, a carded web of synthetic fiber, an air formation mat of synthetic fiber and a wet formation mat of short cut synthetic fiber and pulp are good for such unbonded web. A wet formation method in general cannot impart bulkiness to a web so that for the present invention, such specialized methods as the addition of hydrophobic synthetic fiber and the making of a foamed paper like product are preferabl...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract
An absorbent composite sheet mainly consisting of a fibrous substrate web, a super absorbent polymer, and a bonding component bonding both of them with each other, wherein (a) the fibrous substrate web is a non-bonded web with a few of the constituent fibers bonded with each other, (b) a liquid mixture system is used of a medium mainly consisting of the super absorbent polymer and the bonding component. (c) a composite web is formed by adding the liquid mixture system to the fibrous substrate web, and (d) a liquid component is separated from the composite web so that fixing of the super absorbent polymer to the fibrous substrate web and bonding of the webs of the fibrous substrate web with one another are carried out at the same time. Methods of manufacturing such absorbent composite sheets are also provided.
Description
FIELD OF ART[0001] The present invention relates to methods of manufacturing super absorbent composite sheets wherein the making of a web into a non-woven fabric, the bonding of the web to a super absorbent polymer and the bonding of the particles of the super absorbent polymer with each other are all carried out effectively and little super absorbent polymer drops out in both wet and dry states. The present invention also relates to super absorbent composite sheets manufactured by any of such methods.PRIOR ART[0002] As an absorbent member for such absorbent article as a baby diaper, an adult incontinence diaper, a feminine hygiene product, a blood absorbent material and a mother's milk pad, the development of a highly absorbent sheet mainly consisting of a super absorbent resin polymer (SAP) and a wood pulp fluff the SAP being held in a thinner and more dimensionally stable non-woven fabric structure has been made energetically.[0003] In order for a non-woven fabric to hold SAP, su...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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IPC IPC(8): A61F13/15D04H1/645A61F13/49A61F13/53B32B5/26D04H1/40D04H1/407D04H1/492D04H1/732D04H13/00D21H13/14D21H13/24D21H21/22
CPCD04H13/002D21H21/22D21H13/24D21H13/14A61F13/15642D04H1/4374D04H1/541D04H1/559D04H1/732Y10T442/2484D04H1/645D04H1/407D04H1/492
Inventor SUZUKI, MIGAKUMORI, SHINGO
Owner DSG INT LTD