Disposable Underpants Side-Seal Cuts to Prevent Transverse Tearing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Underpants-type disposable diapers face issues with transverse tearing at positions where the number of stacked sheets varies, which is exacerbated by the formation of perforated lines from the waist opening to leg openings, leading to potential leakage and appearance deterioration.
Innovation Solution
The diapers feature cuts extending longitudinally across stacked sheet number change parts in the side seals without perforated lines, guiding transverse tearing to proceed longitudinally and avoiding direct skin contact, thereby improving fit and reducing leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If perforated lines are formed from the waist opening to the leg openings to facilitate tearing, then tearing is easier to commence, but the fitting deteriorates and leakage likelihood increases
Solution Approach 1:
The invention divides the tearing guidance into multiple short longitudinal cuts distributed along the side seal, rather than one continuous perforated line. Each cut is positioned in the stacked sheet number change part, and collectively they guide the tearing process while maintaining better fitting and reducing leakage risk
Solution Approach 2:
The cuts are specifically positioned in the stacked sheet number change part of the side seal, where the number of stacked sheets varies from waist opening side toward leg openings side. This localized placement ensures tearing guidance exactly where transverse tearing tendency occurs, without creating continuous openings that would compromise fitting
2Ease of operation
If perforated lines are formed from the waist opening to the leg openings to facilitate tearing, then tearing is easier to commence, but appearance deteriorates due to large number of cuts
Solution Approach 1:
The invention segments the tearing guidance function into multiple short longitudinal cuts rather than one continuous perforated line. This segmentation reduces the visual impact on appearance while maintaining the tearing guidance function through strategic placement in the stacked sheet number change part
Solution Approach 2:
The invention extracts the essential function of tearing guidance from the continuous perforated line and implements it through discrete longitudinal cuts. This extraction removes the harmful visual impact of continuous perforations while preserving the useful tearing guidance function
3Strength
If the number of stacked sheets increases in the side seal to improve peel strength, then tearing resistance during wearing improves, but transverse tearing tendency increases at stacked sheet number change parts
Solution Approach 1:
The invention addresses the transverse tearing tendency locally at the stacked sheet number change part by forming longitudinal cuts specifically in this region. The cuts are positioned where the number of stacked sheets varies, providing local guidance to maintain longitudinal tearing direction without reducing the overall peel strength provided by the multi-sheet construction
Solution Approach 2:
The longitudinal cuts act as intermediaries that guide the tearing force to proceed longitudinally through the stacked sheet number change part. These cuts mediate between the high peel strength requirement (achieved through multiple stacked sheets) and the transverse tearing prevention requirement, ensuring tearing proceeds in the desired longitudinal direction
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 design effectively reduces transverse tearing and maintains a smooth, continuous tearing process while minimizing skin exposure and leakage, enhancing the diaper's appearance and comfort.
Implementation Method 1
opposed side seals formed by joining the front body section and the back body section together along opposed lateral portions by means of melt-bonding
Data Source
AI summary
Underpants-type disposable wearing articles are provided wherein transverse tearing is hard to develop at a stacked sheet number change part in the outer member. This problem is solved by an underpants-type disposable wearing article, in which cuts 61 each extending longitudinally across a stacked sheet number change part 62 where the number of stacked sheets constituting the outer member 20 varies are formed adjacent on the central side in the width direction of a side seal 21 formed by joining the front and body sections together along the opposed lateral portions, and which is free of a perforated line formed from the waist opening toward the leg opening.