Automated Mask Stacking via Vertical Accumulator Retainers
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Solution Overview
Problem
Current facemask production lines are limited in capacity, capable of producing only about 100 masks per minute due to manual labor requirements for aligning, stacking, and packaging, which falls short of the estimated 1,500 masks per minute needed during pandemics, hindering the goal of on-demand mass production.
Innovation Solution
An automated method and system for high-speed aligning and stacking wrapped or unwrapped facemasks into a carton using a vertical accumulator with retainer mechanisms and controllable conveyors to manage speed and orientation, allowing for continuous and efficient loading into cartons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual labor is used for aligning, stacking, and packaging facemasks, then the process is simple to operate, but the productivity is limited to about 100 masks per minute
Solution Approach 1:
The system employs self-aligning mechanisms where the facemasks automatically orient themselves during conveyance through guide channels and gravity-assisted positioning, eliminating the need for manual alignment operations while maintaining operational simplicity
Solution Approach 2:
Manual mechanical stacking operations are replaced with an automated vertical accumulator system that uses controlled gravity feed and mechanical retainers to stack masks at high speed, achieving 1,500 masks per minute throughput while the control system remains relatively simple
2Productivity
If high-speed automated stacking is implemented, then the productivity increases to 1,500 masks per minute, but the device complexity increases
Solution Approach 1:
The vertical accumulator enables continuous stacking operations without interruption, maintaining constant high-speed throughput of 1,500 masks per minute by continuously receiving masks from the conveyor and automatically managing stack height through sensor feedback
Solution Approach 2:
The vertical accumulator acts as an intermediary buffer between the high-speed conveyor and the packaging station, absorbing speed variations and simplifying downstream operations while maintaining overall system productivity
3Productivity
If high-speed conveyance is used, then the productivity increases, but cosmetic damage may occur to the wrapped facemasks
Solution Approach 1:
The system incorporates cushioning elements and controlled deceleration zones before masks enter the stacking area, preventing impact damage while maintaining high overall throughput by absorbing shocks in advance rather than limiting speed
Solution Approach 2:
The conveyor system uses variable speed control with dynamic adjustment of transmission ratios, allowing high-speed conveyance followed by controlled deceleration at stacking points, thereby achieving both high productivity and prevention of cosmetic damage through adaptive speed management
Data Source
AI summary
An automated method and system for stacking and loading wrapped or unwrapped facemasks into a carton in a facemask production line includes conveying individual wrapped facemasks in a continuous stream to a stacking location. At the stacking location, the facemasks are deposited into a vertical accumulator such that the facemasks are stacked in the accumulator. Upon reaching a predetermined fill level of facemasks in the accumulator, a bottom retainer in the accumulator is opened such that the stacked facemasks drop into a carton placed below the accumulator. Upon opening the bottom retainer, a mid-level retainer is actuated in the accumulator that captures facemasks that continue to be deposited into the accumulator at an intermediate height above the bottom retainer. The bottom retainer is closed after the stacked facemasks drop into the carton, and the mid-level retainer is then opened such that the facemasks captured by the mid-level retainer drop onto the bottom retainer.