Cardboard Splice Mark Detection for Accurate Sheet Tracking
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Solution Overview
Problem
Existing cardboard sheet-manufacturing processes inaccurately detect paper splice parts due to variations in position calculation, leading to increased defective sheets and bridge stagnation quantity errors, especially when using metal sensors that fail to detect splice parts during sheet meandering.
Innovation Solution
A paper splice part detection device that uses a sheet paper splice detection unit to identify splice parts based on sheet shape, particularly thickness, and applies a mark using a marking device, followed by a mark detection device to ensure accurate detection and removal of splice parts without relying on metal plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If position calculation processing is based on paper splice signal from splicer, then paper splice part can be detected, but position accuracy varies causing increased defective sheets
Solution Approach 1:
The invention uses a marker to create a physical copy/representation of the paper splice part's position. Instead of relying on signal-based position calculation which varies in accuracy, the marker provides a tangible, detectable copy of the splice location that can be accurately detected downstream, eliminating the need for complex position calculations and reducing false defectives.
Solution Approach 2:
The marker acts as an intermediary element between the paper splice part and the detection system. Rather than directly detecting the splice part through variable-accuracy position calculation, the marker serves as a reliable mediator that carries position information in a detectable form, enabling accurate identification without relying on imprecise signal-based calculations.
2Reliability
If metal plate is bonded to paper splice part for detection, then splice part can be detected, but detection fails when sheet meanders
Solution Approach 1:
The invention replaces the mechanical detection system (metal plate with metal sensor) with an optical or electromagnetic detection system (marker with mark detection device). This substitution allows detection of the marker even when the sheet meanders, as the marker detection system can track the marker's position without requiring rigid mechanical contact or precise alignment like the metal sensor system.
Solution Approach 2:
The invention changes the detection parameter from physical contact/metal conductivity to optical/electromagnetic characteristics. The marker has distinct optical or electromagnetic properties that allow detection without physical contact, enabling reliable detection even when the sheet meanders and changes position dynamically during processing.
3Manufacturing precision
If bridge stagnation quantity is calculated based on paper splice part position, then bridge stagnation can be controlled, but calculation accuracy varies leading to improper control
Solution Approach 1:
The marker provides an accurate copy of the paper splice part's position that can be detected with high precision downstream. This eliminates the need to calculate position from splicer signals, providing a reliable reference point for determining bridge stagnation quantity and enabling precise control of the bridging process.
Solution Approach 2:
The marker detection system provides accurate feedback on the actual position of the paper splice part. This feedback information is used to calculate the bridge stagnation quantity with high accuracy, enabling proper control of the bridging process between single facer and double facer, and preventing both excessive stagnation and insufficient bridging.
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
Improves accuracy in detecting paper splice parts, reducing defective sheets and bridge stagnation issues, thereby enhancing the quality and efficiency of cardboard sheet production.
Implementation Method 1
a sheet paper splice detection unit... detecting the sheet paper splice part, based on a shape of the sheet
Implementation Method 2
a marking device that assigns a mark to the sheet paper splice part
Implementation Method 3
a mark detection device that detects the mark on the downstream side
Data Source
AI summary
In a device for detecting a paper splice part of a cardboard sheet and a device for producing a cardboard sheet, the device for detecting a paper splice part of a cardboard sheet, which detects a sheet paper splice part of a cardboard sheet that has a first sheet, a corrugated second sheet, and a third sheet bonded together, comprises: a sheet paper splice detection unit that detects the sheet paper splice part on the basis of the shape of the sheet and that is placed between a position at which sheets are spliced and a position at which the sheets are bonded in a sheet carrying direction; a marking device that marks the sheet paper splice part on the downstream side of the sheet paper splice detection unit in the sheet carrying direction; and a mark detection device that detects the mark on the downstream side of the marking device in the sheet carrying direction.