Paper Wrapping Sheet Strength Window for Tear-Free Printing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The use of paper material for wrapping sheets in absorbent articles leads to tearing during printing due to insufficient tensile strength, which affects printing quality and operability, and high paper basis weight increases material costs and stiffness, causing noise during use.
Innovation Solution
A wrapping sheet made of paper with a tensile strength of 16 N or greater and 25 N or less in the fiber direction, and a ratio of ink or heat seal agent application satisfying 8.45 ≤ X × (1 - Y/100), where X is the tensile strength and Y is the area ratio, ensures printing without tearing and maintains operability and usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If paper material is used for wrapping sheet to improve environmental friendliness, then environmental performance is improved, but tensile strength becomes insufficient causing tearing during printing
Solution Approach 1:
The patent applies parameter changes by precisely controlling the tensile strength of the paper wrapping sheet to fall within the range of 16-25 N, and by controlling the ink application area ratio to satisfy the formula 8.45 ≤ X × (1 - Y/100). This optimization of physical parameters enables printing without tearing while maintaining environmental benefits of paper material.
2Strength
If high paper basis weight is used to increase tensile strength, then strength is improved, but material cost increases and stiffness increases causing noise during opening
Solution Approach 1:
The patent optimizes the paper basis weight parameter to be within a specific range that achieves the required tensile strength of 16-25 N without excessive weight. This parameter optimization reduces material costs while preventing excessive stiffness that would cause noise during opening, balancing strength requirements with cost and usability considerations.
3Ease of manufacture
If ink is applied to paper wrapping sheet for design, then appearance is improved, but paper tearing occurs during printing due to insufficient tensile strength
Solution Approach 1:
The patent establishes a quantitative relationship between ink application and paper strength through the formula 8.45 ≤ X × (1 - Y/100), where X is tensile strength and Y is ink application area ratio. By controlling these parameters within specified ranges, the patent enables successful printing with design appearance while preventing paper tearing during the printing process.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A wrapping sheet includes paper. A surface of the wrapping sheet is subjected to printing while the wrapping sheet is conveyed in a fiber direction of the wrapping sheet, and the wrapping sheet individually wraps an absorbent article. A tensile strength of the wrapping sheet in the fiber direction is 16 N or greater and 25 N or less. The wrapping sheet satisfies 8.45 ≤ X × (1 - Y/100), where X (N) is the tensile strength of the wrapping sheet in the fiber direction before the printing, and Y (%) is a ratio of an area of the wrapping sheet, to which an ink for the printing, a heat seal agent for adhering portions of the wrapping sheets, or both are applied, to an entire area of the wrapping sheet.