Laser Scanning Layout for Automated PET Label Removal
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Solution Overview
Problem
The manual process of separating labels from PET bottles during recycling is inconvenient and hampers the efficiency of the recycling process, as labels are typically made of different materials than the bottles and require manual peeling, which is time-consuming and labor-intensive.
Innovation Solution
A laser processing apparatus and method that uses a light emitter and scanner to form processing shapes on PET bottles by emitting laser light in a scanning direction orthogonal to the conveying direction, allowing for the direct and efficient removal of labels by creating patterns such as character strings or images with higher resolution and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual label separation is used during recycling, then labor flexibility is maintained, but processing time increases and productivity decreases
Solution Approach 1:
The patent replaces manual mechanical label removal with a laser processing system that uses optical energy to directly process and separate labels from bottles. The laser beam scans and processes the label material, enabling automated separation without manual intervention, thereby significantly improving recycling efficiency and reducing processing time.
2Speed
If laser scanning direction is parallel to conveying direction, then processing simplicity is maintained, but processing speed is limited
Solution Approach 1:
The patent changes the scanning direction from parallel to orthogonal relative to the conveying direction, utilizing a two-dimensional scanning approach. This allows the laser to cover the entire label area more efficiently as the bottle moves through the processing zone, thereby increasing processing speed without requiring excessive complexity in the scanning system.
3Productivity
If label removal is automated using laser processing, then productivity increases, but energy consumption increases
Solution Approach 1:
The patent implements continuous laser scanning that operates throughout the entire processing zone as bottles are conveyed. The laser processing occurs continuously without interruption or idle periods, maximizing the utilization of laser energy for productive label removal, thereby improving throughput while optimizing energy consumption through sustained useful action.
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
The laser processing method significantly reduces processing time and increases productivity by forming patterns directly on the PET bottles, enabling faster and more efficient recycling by automating the label removal process.
Implementation Method 1
a light emitter to emit laser light
Implementation Method 2
scan a workpiece in a scanning direction with the laser light emitted from the light emitter, to process the workpiece
Data Source
AI summary
A laser processing apparatus includes: a light emitter to emit laser light; a light scanner configured to scan a workpiece in a scanning direction with the laser light emitted from the light emitter, to process the workpiece; and a conveyor to convey the workpiece to a scanning area scanned by the light scanner in a conveying direction orthogonal to the scanning direction, a longitudinal direction of the scanning area is in the scanning direction.