Absorbent Article Concave Groove Manufacturing
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Solution Overview
Problem
Conventional absorbent articles face challenges in forming concave grooves without compressing the absorbent body, leading to issues like uneven products, reduced absorbency, and increased thickness, which affects fitability and fluid diffusion.
Innovation Solution
A method of manufacturing absorbent articles where a concave groove is formed at the skin-contacting side without compression, using core embosses on both sides of the absorbent body to enlarge the opening and prevent expansion, allowing for proper alignment and processing of the groove without increasing the absorbent body's mass or thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If compression is applied to form concave grooves in the absorbent body, then the groove shape is defined, but the absorbent body is clipped and side walls fall down, causing non-uniform products
Solution Approach 1:
The patent applies preliminary action by forming the concave groove in the absorbent body before stacking the topsheet. The groove is pre-formed with proper depth and shape, and the topsheet is then introduced into the groove without applying compression that would cause the absorbent body to clip or deform. This sequence prevents the side walls from falling down during manufacturing.
Solution Approach 2:
The patent extracts the groove formation process from the compression step. Instead of using compression to define the groove shape, the groove is formed separately (e.g., by cutting or molding) and then the topsheet is simply placed into the pre-formed groove, separating the shape-defining action from the compression action that causes deformation.
2Reliability
If the opening portion of the absorbent body is made large to prevent clipping, then alignment becomes difficult and shifts occur during transferring
Solution Approach 1:
The patent changes the parameter of the groove opening size to an optimal range that prevents clipping while maintaining alignment accuracy. The groove opening is sized large enough to allow the topsheet to be introduced without clipping the absorbent body, but not so large that alignment becomes difficult during transferring and assembly.
3Strength
If compression is applied to bond the topsheet to the absorbent body, then bonding is achieved, but the concave groove volume is reduced and absorbency decreases
Solution Approach 1:
The patent applies preliminary action by pre-forming the concave groove to the desired depth and volume before introducing the topsheet. The groove is prepared in advance with the correct dimensions for fluid storage, and then the topsheet is placed into the groove without applying compression that would reduce the groove volume.
Solution Approach 2:
The patent replaces the mechanical compression system with a bonding system that does not rely on compression. Instead of using compression to bond the topsheet to the absorbent body, the patent uses adhesives or other bonding mechanisms that can attach the topsheet to the groove without applying the high pressures that would collapse the groove and reduce its volume.
4Quantity of substance
If mass per unit area of the absorbent body is increased to compensate for large open portion, then absorbency is maintained, but product thickness increases and fitability worsens
Solution Approach 1:
The patent changes the parameter of the groove opening size to an optimal range that provides sufficient fluid storage capacity without requiring an increase in the mass per unit area of the absorbent body. The groove is sized and shaped to maximize fluid storage volume while maintaining a thin overall product profile that ensures good fitability.
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
This method enables easy formation of concave grooves that enhance fluid diffusion and absorbency while maintaining product fitability, preventing fluid blockage and ensuring consistent absorbency.
Implementation Method 1
forming a concave groove by heat embossing
Implementation Method 2
forming a concave groove by heat embossing
Implementation Method 3
increasing absorbance and retaining characteristics of liquid
Implementation Method 4
quickly transferring the liquid or the like once absorbed to inside an absorbent body
Implementation Method 5
bonded to the part of the topsheet that is introduced therein via the open portion by a melt adhesive method
Implementation Method 6
bonded to the part of the topsheet that is introduced therein via the open portion by a melt adhesive method
Data Source
AI summary
A method of manufacturing an absorbent article. The method includes a first step of forming the absorbent body provided with the absorbent body concave portion; a second step of forming core embosses at least on both sides of the absorbent body concave portion by compressing the absorbent body from the skin-contacting side of the absorbent body; and a third step of stacking the liquid permeable topsheet on a top surface side of the absorbent body and forming the embossed portion.