Nested Zero Waste Ear Web Application Using Dual Cut Slip Unit
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Solution Overview
Problem
In the manufacturing of disposable hygiene products like diapers, existing systems face inefficiencies due to waste generation during the processing of web materials, particularly when applying ear segments, which results in wasted materials and increased costs due to the need for additional steps in recycling and waste management.
Innovation Solution
A method and apparatus that utilize a rotary knife or die with synchronized cutting edges to create trapezoidal ear webs with minimized waste, involving ear turner assemblies to rotate and orient the ear pieces correctly for attachment to a chassis web, allowing for zero or minimal waste in the incoming ear web material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If traditional slip-and-cut applicators are used to apply ear segments to diapers, then the application process can be completed, but waste materials are generated during web processing that require recycling and separation steps
Solution Approach 1:
The incoming web is divided into multiple lanes (first lane and second lane) that are processed separately and then combined. This segmentation allows each lane to be optimized for zero-waste ear formation, with the combined lanes providing the final product structure that eliminates waste material generation during processing.
Solution Approach 2:
The patent combines multiple web lanes in a nested configuration where the first and second lanes are joined together to form the final ear structure. This nesting approach allows efficient material utilization where no material is wasted, as all incoming web material is incorporated into the final product.
2Productivity
If web processing machines operate at high speeds to increase productivity, then output increases, but waste generation becomes more significant due to the rate of processing
Solution Approach 1:
The patent implements a continuous processing system where the incoming web is continuously divided, processed, and combined without interruption. The multi-lane configuration allows continuous high-speed operation while maintaining zero-waste efficiency, as the continuous flow of material through the divided and combined lanes ensures no material is wasted during high-speed processing.
3Loss of substance
If recyclable materials are harvested from defective products at the end of the process, then material recovery is achieved, but the harvesting process is intensive and requires additional separation steps
Solution Approach 1:
Instead of harvesting recyclable materials at the end of the process, the patent prevents waste generation in the first place by using a zero-waste web processing system. The incoming web is continuously processed through divided lanes where all material is incorporated into the final product, eliminating the need for end-of-process harvesting and separation operations.
4Productivity
If traditional ear web geometry is used in incoming rolls, then standard production can be maintained, but waste is generated that cannot be used in subsequent processing
Solution Approach 1:
The incoming ear web is segmented into multiple lanes that are processed separately and then combined. This segmentation allows the entire incoming roll material to be utilized efficiently, with no waste generated, as the divided and combined lane system incorporates all material into the final product structure.
Solution Approach 2:
The patent creates a universal processing system that handles the entire incoming web material through multiple functional lanes. The divided and combined lane configuration provides multi-functionality that ensures all material from the incoming rolls is productively used, eliminating waste while maintaining standard production capabilities.
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 approach enables the application of ear pieces with zero or minimized waste, improving operational efficiency and reducing material costs by optimizing the geometry of the ear pattern and downstream processing, while ensuring proper orientation and attachment to the diaper chassis.
Implementation Method 1
A method and apparatus that utilize a rotary knife or die with synchronized cutting edges to create trapezoidal ear webs with minimized waste
Implementation Method 2
involving ear turner assemblies to rotate and orient the ear pieces correctly for attachment to a chassis web
Implementation Method 3
A die and anvil system rotates to receive the incoming web and cut from it the ear pieces, each having a desired geometry, with no web wasted
Data Source
AI summary
The present invention provides a method of providing a disposable product with zero waste ear formation and attaching the ears to a running chassis web. A cut/slip operation is performed on an incoming web carried by a transfer drum, and the cut/slip pieces are further divided and next separated by a second transfer drum and bonded to incoming webs.