Paper Packaging Seal Structure for Individually Wrapped Absorbent Articles
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Solution Overview
Problem
Existing methods for forming sealing portions in individually packaged absorbent articles using paper packaging sheets lack sufficient sealing strength, and the use of heat sealing agents increases costs.
Innovation Solution
A paper packaging sheet with a heat sealing agent applied at 10% or less of its total basis weight, used to form sealing portions by folding the sheet in a specific direction and applying heat, while minimizing the use of barrier agents to enhance bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a heat sealing agent is used to form sealing portions in paper packaging sheets, then sealing strength is improved, but manufacturing cost increases
Solution Approach 1:
The heat sealing agent is applied selectively only to the sealing portions (edge portions) of the packaging sheet rather than the entire sheet. This localized application provides sufficient sealing strength at the critical sealing areas while minimizing the total amount of heat sealing agent used, thereby reducing manufacturing cost.
Solution Approach 2:
The invention uses a small amount of heat sealing agent (coating weight ratio of 5% or less, preferably 1% or less) applied only to the necessary sealing areas. This partial action approach achieves the required sealing function without the excessive use of sealing agents that would increase cost.
2Ease of manufacture
If the packaging sheet is folded and sealed using mechanical pressure only, then manufacturing simplicity is maintained, but sealing strength is insufficient
Solution Approach 1:
The heat sealing agent acts as an intermediary substance between the opposing edge portions of the folded packaging sheet. When heat and pressure are applied, the heat sealing agent melts and bonds the paper fibers together, creating a strong seal. This intermediary enables reliable sealing without requiring complex manufacturing equipment.
Solution Approach 2:
The invention changes the physical state of the heat sealing agent from solid to liquid/melted state through heating, enabling it to flow into and bond with paper fibers. This parameter change (temperature increase) transforms the sealing mechanism from mechanical pressure only to thermal-mechanical bonding, significantly improving sealing strength while maintaining manufacturing simplicity.
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 method achieves reliable sealing with reduced heat sealing agent usage, maintaining high sealing strength and preventing agent seepage, thus enhancing the packaging's integrity and user experience.
Implementation Method 1
a sealing portion is formed by folding the packaging sheet toward an inner surface side in a longitudinal direction of the packaging sheet and sealing both edge portions in a lateral direction orthogonal to the longitudinal direction, a heat sealing agent is provided on at least a region included in the sealing portion
Data Source
AI summary
In an individually packaged absorbent article formed by wrapping an absorbent article in a packaging sheet made of paper, a sealing portion is formed by folding the packaging sheet toward an inner surface side in a longitudinal direction of the packaging sheet and sealing both edge portions in a lateral direction orthogonal to the longitudinal direction, a heat sealing agent is provided on at least a region included in the sealing portion of one of the inner surface and the outer surface of the packaging sheet, and the packaging sheet is a barrier agent-uncoated sheet or a barrier agent-coated sheet, and a coating weight of the barrier agent is 10% or less with respect to a total basis weight of the packaging sheet after the heat sealing agent is provided.