Substrate Speed Control for Hook Formation in Absorbent Articles
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Solution Overview
Problem
Existing methods for manufacturing absorbent articles with hook-and-loop fastening systems face challenges in achieving high manufacturing speeds while allowing for flexibility in producing different sizes and patterns of hooks.
Innovation Solution
A method involving advancing a substrate at a first speed, decelerating a portion to a second speed, arranging it with a die surface having cavities, applying energy to form discrete zones of protrusions, and then accelerating back to the first speed before cutting into discrete pieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hooks are formed by heating thermoplastic resin in an extruder and molding while soft or partially molten, then manufacturing speed can be maintained, but flexibility in producing different sizes and patterns of hooks is reduced
Solution Approach 1:
The substrate is divided into discrete zones that are independently formed with hooks. Each zone can be configured with different hook patterns, sizes, and arrangements while the rest of the substrate remains unaffected. This segmentation allows flexible production of various hook configurations without requiring complete retooling or changing the entire manufacturing process.
Solution Approach 2:
Different regions of the substrate are treated differently - only specific zones receive the hook-forming treatment while other areas maintain their original properties. This local quality approach enables the same substrate to have varying hook characteristics in different locations, providing adaptability for different product requirements without sacrificing manufacturing speed.
2Productivity
If ultrasonic vibration is used to soften substrate material for hook formation, then manufacturing speed can be maintained, but the complexity of the apparatus increases
Solution Approach 1:
The die surface serves multiple functions: it provides the structural form for hooks, applies pressure to shape the material, and works in conjunction with the ultrasonic vibration to soften the substrate. This multi-functionality reduces the need for separate components and simplifies the overall apparatus while maintaining high manufacturing speed.
Solution Approach 2:
The die surface acts as an intermediary between the ultrasonic vibration source and the substrate. It transfers the vibrational energy to the substrate material while simultaneously shaping the hooks. This intermediary approach simplifies the system by combining the softening and forming functions in a single component.
3Manufacturing precision
If the substrate is decelerated to form hooks while advancing, then hook formation quality is improved, but the overall manufacturing time increases
Solution Approach 1:
The substrate experiences periodic deceleration and acceleration cycles as it passes through the hook formation zone. During the deceleration phase, hooks are formed with high precision; during the acceleration phase, the substrate catches up to the base speed. This periodic action allows quality formation without permanently increasing manufacturing time.
Solution Approach 2:
The substrate is decelerated only for the brief moment needed to form the hooks, not for the entire manufacturing process. This preliminary action approach ensures high hook formation quality while minimizing the impact on overall manufacturing time, as the substrate returns to full speed quickly after hook formation.
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 method enables the formation of discrete zones of protrusions, such as hooks, on absorbent articles without sacrificing high manufacturing speeds, providing flexibility in producing different sizes and patterns.
Implementation Method 1
applying energy to the portion of the first substrate while advancing at the second speed such that softened material of the first substrate moves into the cavities of the die surface
Data Source
AI summary
Aspects of the present disclosure relate to methods and apparatuses for manufacturing absorbent articles, wherein discrete zones of protrusions may be formed on a substrate. In some configurations, the protrusions may be formed as hooks. When forming the discrete zones of protrusions, localized speed variances may be imparted to the advancing substrate to ensure the adequate time to form the protrusions is provided. As such, protrusions may be formed on portions of the substrate that have been temporarily stopped or slowed to relatively slow speeds. The substrates with zones of protrusions may then be incorporated into products, such as assembled absorbent articles, so as to place the protrusions in desired positions on the absorbent articles. As such, the methods and apparatuses herein allow for the use of hook forming techniques on substrates in article manufacturing processes that provide flexibility in such configurations without sacrificing desired manufacturing speeds.