Web Cutting Transport Layout for Parallel Absorbent Article Cuts
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Solution Overview
Problem
Conventional cutting devices for absorptive articles, such as disposable diapers, often result in manufacturing defects and poor appearance due to inclined cut surfaces caused by displacement of the web during cutting, leading to bond failures and aesthetic issues.
Innovation Solution
A cutting device with a first belt conveyor to hold and transport the continuous web portion and a second belt conveyor to manage the discontinuous portion, ensuring the continuous portion is accurately fed to the press-contact region between the die roll and anvil roll, preventing displacement and maintaining a cut surface parallel to the CD direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the web is transported without being held/nipped by the transport units, then the transport process is simple, but the cut surface becomes inclined relative to the CD direction causing manufacturing defects
Solution Approach 1:
The continuous portion transport unit is configured to hold and transport the continuous portion of the web before it reaches the cutting zone. This preliminary holding action ensures the web is properly positioned and stabilized prior to cutting, preventing displacement that would cause inclined cut surfaces. The transport unit prepares the web in advance for accurate cutting by maintaining controlled contact.
2Manufacturing precision
If the continuous portion is held and transported by the first belt conveyor, then the cut surface parallelism is improved, but the device complexity increases
Solution Approach 1:
The transport system is segmented into two distinct belt conveyors: a first belt conveyor for holding and transporting the continuous portion, and a second belt conveyor for transporting the discontinuous portion. This segmentation allows each conveyor to be optimized for its specific function - the first conveyor provides the necessary holding action for precision cutting, while the second conveyor handles the cut articles. The segmentation resolves the complexity issue by distributing functions across separate components rather than requiring a single complex system.
3Ease of manufacture
If the discontinuous portion passes through without contacting the rolls, then the cutting process is simplified, but the web displacement control is compromised
Solution Approach 1:
The system applies local quality by differentiating how the continuous and discontinuous portions are handled. The first belt conveyor provides localized holding and transport for the continuous portion where precision is critical during cutting. The second belt conveyor provides localized transport for the discontinuous portion after cutting. Each region of the transport system has tailored characteristics appropriate to the specific portion of the web being handled, optimizing both stability and manufacturing ease.
Data Source
Figure 1
Figure 2(a)~2(c)
Figure 3
AI summary
A cutting device 100 feed a web 200 between a die roll 10 and an anvil roll 20, and cut a continuous portion 210 of the web 200. The cutting device 100 includes a continuous portion transport unit 30 configured to hold and transport the continuous portion 210 of the web being continuous in a moving direction of the web, and a discontinuous portion transport unit 40 configured to hold and transport a discontinuous portion of the web being discontinuous in the moving direction of the web. The die roll 10 includes a first large diameter portion 12 whose outer peripheral surface is provided with a cutting blade 15 configured to cut a continuous portion 210 of the web. The anvil roll 20 includes a second large diameter portion 22 disposed to face the first large diameter portion 12. By the discontinuous portion transport unit 40, the discontinuous portion 220 passes through between the die roll 10 and the anvil roll 20 without contacting the first large diameter portion 12 and the second large diameter portion 22.