Flexible Web Flatness Measurement via Tension Conversion

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Solution Overview

Problem

Existing methods for determining the flatness of flexible web materials are costly and require complex control technology, limiting conveying speeds and stability, especially when measuring small web tensions.

Innovation Solution

A method involving determining the actual flatness of the web material, selecting a relevant process parameter such as web tension, and converting the flatness into comparative values based on these parameters, allowing for a simpler evaluation of flatness quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If measuring devices are used to determine flatness at very small web tension, then measurement precision is improved, but device complexity and cost increase significantly

Engineering Contradiction:

Improveflatness measurement precisionVSAvoidcontrol technology complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent changes the measurement parameter from direct flatness measurement at very small tension to measuring web tension itself. By using tension measuring devices that detect the force required to deflect the web material, the system achieves accurate flatness determination indirectly through tension values, avoiding the need for complex control technology while maintaining measurement precision.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If very small web tension is controlled to minimize flatness influence, then measurement accuracy is improved, but reliability decreases due to instability and faults

Engineering Contradiction:

Improveflatness measurement accuracyVSAvoidmeasurement system stability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent replaces complex mechanical control systems for maintaining very small web tension with a simpler tension measurement system. By measuring the actual tension force required to achieve proper web contact with rollers, the system determines flatness through force measurement rather than through complex mechanical positioning and control, thereby improving reliability while maintaining accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If conventional measuring devices are used between guide rollers, then flatness can be detected, but conveying speed is limited and downtime increases

Engineering Contradiction:

Improveflatness detection capabilityVSAvoidconveying speed

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent replaces mechanical measuring devices that physically contact and slow the web material with a tension-based measurement system. By measuring web tension forces as the material passes through the calibration basket, the system enables flatness determination without mechanical interference that would limit conveying speed, thus improving productivity while maintaining detection capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS20250076037A1Method for determining the flatness of flexible web material, method for evaluating the flatness of web material, flatness measuring arrangement and blown film line with such a flatness measuring device

Publication Date: 2025.03.06 KDESIGN GMBH

AI summary

A method for determining flatness of a flexible web material in a manufacturing process of the flexible web material includes: determining an actual flatness of the web material; determining a first process parameter of the manufacturing process; converting the actual flatness of the web material into at least one comparative value of the actual flatness of the web material depending on the first process parameter.