Zero Waste Ear Application via Nested Trapezoidal Cutting
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Solution Overview
Problem
Current methods for manufacturing disposable hygiene products, such as diapers, result in significant waste due to the inefficiencies in processing and applying web materials, where recyclable materials are often commingled and harvested only after defective products are identified, leading to unnecessary material waste.
Innovation Solution
A process and apparatus that allows for the application of trapezoidal ear webs to a traveling web with zero or minimized waste, utilizing a rotary knife or die with synchronized cutting edges and a vacuum anvil to create discrete ear pieces, which are then rotated and applied to a chassis web using an ear turner assembly, ensuring correct orientation and minimizing material loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional web processing methods are used to manufacture disposable hygiene products, then production can be maintained at standard speeds, but significant material waste occurs due to inefficiencies in processing and applying web materials
Solution Approach 1:
The incoming web is divided into multiple lanes (first lane and second lane) that are processed separately and simultaneously. This segmentation allows each lane to be optimized for zero-waste ear web formation, with dedicated cutting and processing stations for each lane, eliminating the need to harvest recyclable materials from defective products in a commingled stream.
Solution Approach 2:
The patent employs nested processing where ear webs are formed within the larger web structure, with inner ears nested between outer ears in the sequence of processing. The cutting edges and processing stations are nested along the web path, allowing simultaneous processing of multiple ear webs in an compact arrangement that maximizes material utilization.
2Reliability
If recyclable materials are harvested only after defective products are identified, then product quality can be maintained, but the harvesting process becomes intensive and requires additional separation steps
Solution Approach 1:
The patent performs preliminary sorting and separation of ear webs into distinct lanes before the harvesting stage. By pre-organizing the web material into first and second lanes with dedicated processing paths, the system eliminates the need for intensive post-defect harvesting and separation operations, reducing device complexity while maintaining product quality through controlled processing.
3Productivity
If operational speeds of diaper converters are increased to improve productivity, then manufacturing efficiency increases, but the mechanical integrity and operational capabilities of applicators must be significantly improved
Solution Approach 1:
The applicator system is segmented into multiple independent processing lanes, each with its own cutting and application stations. This allows the system to operate at high speeds by distributing the workload across parallel channels, reducing the mechanical burden on any single applicator component while maintaining overall high productivity.
Solution Approach 2:
The patent employs dynamic speed synchronization where the first and second lanes can operate at different speeds independently, allowing the system to optimize for high throughput while maintaining mechanical integrity. The synchronized cutting edges and adjustable lane speeds enable the applicator to adapt to varying operational requirements without compromising structural integrity.
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 eliminates waste by optimizing the geometry of ear patterns and downstream processing, allowing for efficient application of ear pieces to the chassis web with zero material waste, improving operational efficiency and reducing waste generation in the manufacturing process.
Implementation Method 1
a synchronized vacuum anvil to receive the incoming web and hold discrete ear pieces
Implementation Method 2
A rotary knife or die, with one or more cutting edges, turns against and in coordination with a corresponding anvil to create preferably trapezoidal ears
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.