Discrete Portion Separation from Web Without Ribbon Transport
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Solution Overview
Problem
The existing methods for manufacturing absorbent articles, such as diapers and sanitary napkins, are limited by the use of a ribbon to transport discrete portions, which restricts shape, dimension, and configuration, leading to manufacturing issues like premature separation, damage, and misalignment, resulting in uncomplicated and malformed products.
Innovation Solution
A method that eliminates the need for a ribbon by using a converting mechanism with a rotary cutter and anvil roll to form and separate discrete portions directly from the first web, allowing for any desired shape, dimension, and configuration, and enabling bonding to a second web without the constraints of a linear cut edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a ribbon is used to transport discrete portions, then the discrete portions can be advanced through the manufacturing process, but the shape, dimension, and configuration of the discrete portions are limited and manufacturing problems such as premature separation, damage, stretching, skewing, and wrinkling occur
Solution Approach 1:
The patent removes the ribbon component from the manufacturing system entirely. Instead of using a ribbon to transport discrete portions through forming and converting mechanisms, the system directly forms discrete portions from a continuous web and transfers them to a take-up roll. This extraction eliminates the constraints and problems associated with ribbon-based transport while maintaining the essential transport function.
2Manufacturing precision
If the amount of ribbon is decreased to minimize the size of the linear edge of the discrete portion, then the linear cut edge size is reduced, but the amount of stress on the ribbon increases resulting in premature separation and damage
Solution Approach 1:
By removing the ribbon from the system, the patent eliminates the trade-off between cut edge size and ribbon strength. The direct formation and transfer method allows for precise cutting without requiring a ribbon to maintain structural integrity, as there is no ribbon to experience stress or premature separation.
3Ease of operation
If a ribbon is used to transport the discrete portion, then the discrete portion can be carried to the bonding location, but skewing occurs resulting in misalignment and incorrect cutting at the converting mechanism
Solution Approach 1:
The patent eliminates the ribbon-based transport system that causes skewing and misalignment. Instead, discrete portions are directly formed on a take-up roll or transfer surface, ensuring proper alignment from the formation stage through converting. This direct transfer method prevents the skewing that occurs when ribbons are pulled through the manufacturing process.
Data Source
AI summary
A method of separating a discrete portion from a first web. The discrete portion can be bonded to a second web which may be moving at the same or different speed. The discrete portion can be incorporated into an absorbent article.