Paper Packaging Sheet Structure for Tear-Resistant Soft Opening
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Solution Overview
Problem
Paper packaging sheets for absorbent articles tend to tear easily, compromising their usability and touch, and existing solutions to enhance strength often result in rigidity and loss of flexibility.
Innovation Solution
A paper packaging sheet with inward folding and sealed edges, featuring tensile elongation of 15% or more in both longitudinal and transverse directions, and optimized tensile strength, using crepe paper with controlled crepe ratio to maintain flexibility and resist tearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the packaging sheet is made thicker to prevent tearing, then the strength is improved, but the sheet becomes hard and compromises the touch
Solution Approach 1:
The invention changes the physical parameters of the paper packaging sheet by controlling tensile elongation in both longitudinal and transverse directions to be 15% or more. This parameter adjustment allows the sheet to maintain high tear resistance without increasing thickness, thereby preserving the soft touch quality. The specific elongation thresholds serve as critical parameters that resolve the contradiction between strength and tactile comfort.
Solution Approach 2:
The invention uses composite paper structures with specific fiber compositions and bonding characteristics to achieve both high strength and softness. By combining different papermaking components and controlling the internal structure, the packaging sheet attains enhanced tear resistance while maintaining a gentle touch, eliminating the need to increase thickness for strength improvement.
2Shape
If the packaging sheet is made thinner to improve touch, then the flexibility is improved, but the sheet becomes prone to tearing
Solution Approach 1:
The invention fundamentally changes the strength parameters of thin paper by specifying minimum tensile elongation values of 15% or more in both directions. This allows thin packaging sheets to achieve exceptional tear resistance without compromising the soft touch quality, effectively decoupling the relationship between thickness and strength that traditionally existed in paper materials.
Data Source
AI summary
An individually packaged absorbent article, for which an absorbent article is individually packaged by a packaging sheet made of paper, wherein the packaging sheet is inwardly folded in a longitudinal direction with the absorbent article disposed inside the packaging sheet, and both edge portions in a transverse direction orthogonal to the longitudinal direction are sealed, and the packaging sheet has tensile elongation in the longitudinal direction and tensile elongation in the transverse direction that are 15% or more.