Tissue Paper Packing Vision System for Defect Detection

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Solution Overview

Problem

Existing packing machines for tissue paper products lack the ability to detect defects in the packing process, such as folding, welding, and positioning errors, which can result in low-quality packs.

Innovation Solution

A packing machine equipped with a vision system comprising video cameras that acquire images of the pack during the packing cycle, allowing for real-time quality control and automatic or manual adjustments to correct defects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If generic means for detecting the size of the group of rolls are used, then the machine can handle different pack sizes, but the machine cannot detect quality defects such as folding, welding, or positioning errors

Engineering Contradiction:

Improveability to handle different pack sizesVSAvoidquality control capability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The vision system is divided into multiple cameras positioned at different locations (above, beside, below the pack) to detect different types of defects. Each camera captures specific views of the wrapping sheet and pack, enabling comprehensive quality inspection while maintaining the ability to handle various pack sizes through coordinated multi-camera operation.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If no vision system is installed, then the machine structure remains simple, but quality defects cannot be detected during the packing cycle

Engineering Contradiction:

Improvemachine structure simplicityVSAvoidpack quality

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

A vision system acts as an intermediary between the packing machine and the quality control process. The vision system includes multiple cameras that capture images of the wrapping sheet and pack, which are then processed by a control unit to detect defects. This intermediary system enables comprehensive quality inspection without requiring fundamental changes to the packing machine structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If quality control is performed during the packing cycle, then defects can be detected and corrected, but the packing process requires additional monitoring systems

Engineering Contradiction:

Improvedefect detection capabilityVSAvoidmonitoring system requirements

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The vision system serves multiple functions simultaneously: it monitors the wrapping sheet positioning, detects folding defects, identifies welding errors, and tracks pack formation throughout the packing cycle. The control unit processes images from multiple cameras to perform comprehensive quality control, enabling a single monitoring system to handle various inspection tasks without requiring separate specialized systems for each defect type.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentEP4367029B1System for packing tissue paper products in wrapping sheets

Publication Date: 2025.05.14 VALMET TISSUE CONVERTING SPA

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AI summary

The system comprises a packing machine (1) and one or more video cameras (51.1-51.5) to detect the quality of packs (C) of tissue paper products (R), and or of the wrapping sheet (F) used for wrapping the packs. A control unit (53) is provided to manage the detected images and, if necessary, to compare them with reference images.