Absorptive Article Joint Strength and Peeling Control
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Solution Overview
Problem
Conventional methods for disposable paper diapers fail to enhance both the strength of the joint section and the ease of peeling simultaneously, leading to improper peeling issues when worn or disposed of.
Innovation Solution
The absorptive article features seams with regions of varying bonding strengths, using heat sealing or ultrasonic sealing to join the belly-side and back-side portions, with reduced strength regions and unreduced strength regions between them, allowing for strong joint sections that prevent improper peeling while enabling easy peeling when desired.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If adhesive is applied between laminated sheets at side end portions to weaken joint strength, then ease of peeling is improved, but joint strength is reduced
Solution Approach 1:
The patent applies different bonding methods to different regions of the joint section. Specifically, the first joint section (at the side end) uses a bonding method that provides reduced strength for easy peeling, while the second joint section (at the waist opening) uses a bonding method that provides high strength to prevent improper peeling. This local differentiation of bonding characteristics resolves the contradiction between ease of peeling and joint strength.
Solution Approach 2:
The joint section is divided into multiple distinct regions: a first joint section with reduced strength for easy peeling, and a second joint section with high strength for securing the diaper. By segmenting the joint section into functionally distinct parts, the patent enables both easy peeling (at the first joint section) and high joint strength (at the second joint section) to coexist.
2Strength
If thermal energy or ultrasonic energy is applied to web materials to improve bonding strength, then joint strength is improved, but ease of peeling deteriorates
Solution Approach 1:
The patent applies thermal energy or ultrasonic energy selectively to the second joint section (at the waist opening) to achieve high bonding strength, while the first joint section (at the side end) uses a different bonding method that does not involve thermal or ultrasonic energy, thereby maintaining ease of peeling. This localized application of energy-based bonding resolves the contradiction between bonding strength and ease of peeling.
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 achieves both enhanced joint strength and ease of peeling, ensuring the diaper remains secure when worn and can be easily separated during disposal.
Implementation Method 1
joining, using heat sealing or ultrasonic sealing, the belly-side portion and the back-side portion
Implementation Method 2
joining, using heat sealing or ultrasonic sealing, the belly-side portion and the back-side portion
Data Source
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AI summary
An absorptive article (1) comprises: an absorptive body (10) which includes an absorption body (13); and an exterior body (20) which is provided to the outer surface side of the absorptive body (10) and is provided with a belly-side portion (F) which is located on the belly side of a human body when the absorptive article(1) is worn and with a back-side portion (B) which is located on the back side of the human body when worn, wherein a waist opening section (W) and a pair of left and right leg opening sections (L) are formed in the absorptive article (1) by joining, using heat sealing or ultrasonic sealing, the belly-side portion (F) and the back-side portion (B) of the exterior body (20) together at joint sections (21, 22) located at both side ends of the belly-side portion (F) and the back-side portion (B). Reduced strength regions (T) and unreduced strength regions (S) are disposed between the belly-side section (F) and the back-side section (B) at the positions of the joint sections (21, 22). A reduced strength region (T) has disposed therein a joint strength-reducing material for reducing the joint strength between the joint sections (21, 22), and an unreduced strength region (S) has no joint strength-reducing material disposed therein. Enhanced strength and increased easiness of peeling of the joint sections are achieved at the same time.