Method for cutting objects out of an at least partially two-ply web of material by means of a cutting device

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Solution Overview

Problem

Cutting objects from two-ply material webs, especially for airbag blanks, is challenging due to material distortion, which can lead to inaccurate cutting and potential damage to safety-critical areas, and existing methods require pre-marking the web with additional effort and cost.

Innovation Solution

The method detects the position of objects in the web using non-contact structural changes and distinctive geometric part shapes, allowing for correction of cutting coordinates without pre-marking, using photographic devices and transillumination to capture high-resolution images of interconnected areas for precise cutting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If pre-marking the material web with markings is done to detect distortion, then measurement precision is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improvedistortion detection precisionVSAvoidmarking system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The material web's own structural features (interconnected areas where layers are connected) are used as the detection markers. The system leverages the material's inherent characteristics rather than requiring external marking systems, allowing the material to 'mark itself' through its construction pattern.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The invention extracts and utilizes the existing structural features (interconnected areas) from the material web construction process. These pre-existing features are isolated and used as detection markers, eliminating the need to add separate marking elements to the material.

Inventive Principle:

Principle #2Taking out (Extraction)

2Manufacturing precision

If pre-marking the material web is implemented to detect distortion, then manufacturing precision is improved, but productivity decreases due to additional processing steps

Engineering Contradiction:

Improvecutting accuracyVSAvoidproduction speed

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The interconnected areas are created during the material web construction process itself, before the cutting operation. This preliminary structuring serves dual purposes: both constructing the material web and providing detection markers, eliminating the need for separate marking steps.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The interconnected areas serve multiple functions: they provide structural integrity to the material web and simultaneously serve as detection markers for distortion compensation. This multi-functionality eliminates the need for separate marking operations.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Manufacturing precision

If pre-marking the material web is done to detect distortion, then manufacturing precision is improved, but loss of substance increases due to additional materials required

Engineering Contradiction:

Improvecutting accuracyVSAvoidadditional marking materials

Core Design Contradiction:

Manufacturing precisionVSLoss of substance

Solution Approach 1:

Inventive Principle:

Principle #25Self-service

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 position-accurate cutting of objects without pre-marking the material web, reducing errors and costs, while detecting potential material defects and ensuring safety-critical areas are not damaged.

Implementation Method 1

illumination of the material web (1) in a region in which the two layers of material are connected to one another in a linear, strip-shaped and/or two-dimensional manner, viewed from the rear, with a transillumination device (15)

Methodology Applied

Scientific EffectTransillumination: Absorption (EM radiation)

Data Source

PatentEP3224404B1Method for cutting objects out of an at least partially two-ply web of material by means of a cutting device

Publication Date: 2023.01.04 HELD GUNNAR

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Figure 3A~3C

AI summary

Method for cutting objects out of an at least partially two-ply web of material by means of a cutting device, wherein two material plies are connected to one another at least partially in a linear, strip-like and/or areal manner. The position of the respective object to be cut out is detected contactlessly on the basis of changes in structure in the material, these being part of the object which arise on account of those regions in the web of material which are connected to one another in a linear, strip-like and/or areal manner. The position of the object is detected in the web of material at least on the basis of previously determined and stored, prominent and spaced-apart geometrical part shapes of those regions of the object which are connected to one another in a linear, strip-like and/or areal manner.