Compression Roller Surface for Biodegradable Sanitary Web Bonding
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Solution Overview
Problem
Conventional synthetic-based glues used in producing absorbent sanitary articles penetrate poorly into biodegradable material webs, leading to inadequate bonding and increased stiffness due to excessive glue penetration into the absorbent core.
Innovation Solution
An apparatus and method utilizing a slick support surface and compression rollers with slick cylindrical outer surfaces to compress the multilayer web, reducing glue penetration and improving bonding between the top sheet, back sheet, and absorbent core while maintaining biodegradable properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If biodegradable glues are used to join the top sheet and back sheet webs, then the product becomes biodegradable, but the glue penetrates excessively into the absorbent core causing increased stiffness and discomfort
Solution Approach 1:
The compression roller is designed with a selective surface structure featuring raised areas and recessed areas. The raised areas apply localized compression force to control glue penetration into the absorbent core, while the recessed areas allow excess glue to be absorbed or redirected. This local quality variation in the compression roller surface enables precise control over glue distribution, maintaining biodegradability while preventing excessive penetration that causes stiffness.
2Strength
If conventional synthetic-based glues are used, then strong bonding is achieved, but the product loses biodegradable properties
Solution Approach 1:
The invention changes the chemical parameters of the adhesive by using biodegradable glues instead of conventional synthetic-based glues. This parameter change in adhesive composition enables the product to maintain biodegradable properties. The compression roller's selective surface structure compensates for the potentially lower initial bonding strength of biodegradable glues by controlling their distribution and penetration, achieving adequate bonding while preserving biodegradability.
3Strength
If compression is applied to control glue penetration, then bonding is improved, but the glue may still penetrate through the webs and impregnate the absorbent core excessively
Solution Approach 1:
The compression roller features a selective surface with raised areas that concentrate compression force at specific locations to enhance bonding between the top sheet and back sheet webs. The recessed areas between the raised portions allow controlled passage of glue, preventing excessive impregnation of the absorbent core. This local quality differentiation in the compression roller surface enables simultaneous achievement of strong bonding and controlled glue distribution.
Solution Approach 2:
The compression roller surface is segmented into multiple raised areas and recessed areas, creating a patterned structure. This segmentation allows different zones of the roller to perform different functions: raised areas for compression and bonding enhancement, and recessed areas for glue management. The segmented structure provides precise control over the compression process, improving bonding while limiting excessive glue penetration into the absorbent core.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves better bonding between the layers of the absorbent sanitary article, reducing stiffness and discomfort, while ensuring the biodegradability of the product.
Implementation Method 1
a compression roller adjacent to said support surface and configured to compress said multilayer web on said support surface
Implementation Method 2
biodegradable type glues can be used instead of conventional synthetic-based glues
Data Source
AI summary
An apparatus for producing an absorbent sanitary article, including a slick support surface, a forming unit configured to form a multilayer web of an absorbent sanitary article, the multilayer web including a top sheet web, a back sheet web and a plurality of absorbent cores placed between the top sheet web and the back sheet web, and to feed the multilayer web on the support surface, at least one glue dispenser configured to dispense a liquid glue onto the back sheet web and/or onto the top sheet web. The apparatus further includes at least one compression roller adjacent to the support surface and configured to compress the multilayer web on the support surface, the at least one compression roller including a slick cylindrical outer surface.