Web Cutting with Upstream Defect Detection for Long Sheet Lengths
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Solution Overview
Problem
Existing methods fail to efficiently process web-shaped materials into cutting lengths longer than the distance between defect detection and cutting positions, leading to time-consuming and labor-intensive procedures when defects occur, especially with materials having high friction, weight, or elasticity.
Innovation Solution
A device comprising a defect detection unit, control unit, and cutting devices that monitor and cut web-shaped materials in real-time, allowing for precise cutting based on detected defects and predefined lengths, without requiring large storage facilities or material handling that could cause damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If web-shaped material is processed into cutting lengths longer than the distance between defect detection and cutting position, then productivity is improved, but when a defect is detected, time-consuming manual intervention is required to remove defective sections
Solution Approach 1:
The system performs preliminary defect detection upstream before the cutting position. When a defect is detected, the control unit proactively calculates the optimal cutting position and sends cutting commands to multiple cutting devices in advance, eliminating the need for manual intervention and maintaining continuous production flow.
Solution Approach 2:
The defect detection unit provides real-time feedback about defect positions to the control unit. The control unit uses this feedback to dynamically adjust cutting positions and commands, ensuring that defective sections are automatically removed while maintaining the desired cutting length productivity.
2Ease of operation
If web-shaped material with high friction or elasticity is handled by pulling out from container, then cutting process is simplified, but material may be damaged or measurement accuracy decreases
Solution Approach 1:
The system extracts the defect detection and cutting control functions from the manual handling process. By detecting defects upstream and automatically controlling cutting positions, the system eliminates the need to pull material from containers, thereby preventing damage to high-friction or elastic materials while maintaining cutting process efficiency.
Solution Approach 2:
The patent replaces manual mechanical handling with an automated system combining defect detection units, control units, and cutting devices. This substitution eliminates the mechanical stress of pulling material from containers, preserving material integrity while maintaining operational simplicity.
3Reliability
If multiple cutting devices are used to remove defective sections, then defect removal is achieved, but device complexity and production downtime increase
Solution Approach 1:
The control unit serves multiple functions: it receives defect detection signals, calculates optimal cutting positions, and controls multiple cutting devices. This multi-functionality allows the system to use multiple cutting devices for defect removal without proportionally increasing overall system complexity, as the control logic is integrated and automated.
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
Enables efficient cutting of web-shaped materials into desired lengths while minimizing waste and maintaining material integrity, suitable for materials with high friction or elasticity, by eliminating the need for complex storage and reducing production downtime.
Implementation Method 1
a defect detection unit configured to monitor the web-shaped material for defects and to detect any defects occurring in the web-shaped material
Implementation Method 2
The at least one cutting device can cut the web-shaped material at at least one initial cutting position. The cutting device can include a blade.
Implementation Method 3
It is also possible for the cutting device to perform the at least one cut using ultrasound.
Data Source
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AI summary
The present invention relates to a device for cutting a web-shaped material, comprising at least one cutting device for cutting the web-shaped material into web sections at at least one first cutting position, a control unit, a defect detection unit, and a means for moving the web-shaped material such that the web-shaped material can be guided in a downstream direction first past the defect detection unit and then past the at least one cutting device. The defect detection unit is configured to monitor the web-shaped material for defects and to transmit a signal containing information about the result of the monitoring to the control unit.The device comprises at least one first sheeting container, wherein the first sheeting container can receive a web section of the downstream transported web-shaped material of a defined minimum cutting length, the defined minimum cutting length being the shortest intended length of a finished web section, and wherein the first cutting position of the at least one cutting device is arranged upstream above the first sheeting container. The invention further relates to a method for cutting a web-shaped material.