Film Wrapping Print Registration via Sensor Feedback
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Solution Overview
Problem
Existing methods for wrapping products with heat shrinkable film do not achieve print registration, resulting in inconsistent film placement and sealing, which affects the accuracy and quality of the wrapping process.
Innovation Solution
Implementing a sensor system that reads registration marks on the film to control the length of film pulled from a single roll, adjusting the position of the product relative to the sealing bar to ensure proper print registration, and using a pusher plate or conveyor to guide the product through a curtain of film, while maintaining tension with pinch rollers or a dancing bar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single roll of film is used for wrapping, then device complexity is reduced, but print registration precision deteriorates
Solution Approach 1:
A sensor detects the position of print marks on the film and provides feedback to a control system. The control system adjusts the film pull distance or product stop position based on this feedback to achieve proper print registration. This closed-loop control enables precise print registration despite using a simpler single-roll film supply system.
2Manufacturing precision
If the product stop position is adjusted dynamically, then print registration precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical positioning systems with a combination of sensors and control algorithms. Instead of using multiple mechanical adjustment mechanisms, the system uses a sensor to detect print mark positions and a controller to calculate and execute the necessary position adjustments, simplifying the mechanical structure while maintaining precision.
3Manufacturing precision
If film length is precisely controlled based on sensor readings, then print registration is improved, but measurement and control difficulty increases
Solution Approach 1:
The patent introduces print marks on the film as intermediary reference elements. These marks serve as detectable intermediaries that allow the sensor to accurately determine film position. The marks act as a mediator between the film supply system and the control system, making it easier to detect and measure film position for precise length control.
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
Ensures precise print registration and consistent film wrapping, improving the accuracy and quality of the wrapping process by adjusting the film length and product positioning based on sensor readings, and maintaining film tension for effective sealing.
Implementation Method 1
A sensor such as a photo sensor reads the mark and determines whether the proper length of the film has been pulled off the roll
Implementation Method 2
After wrapping, the product is sent though a conventional heat shrinkable tunnel that heat shrinks the film
Data Source
AI summary
This invention is to register printed film on product while wrapping the printed film from a single roll. This is achieved by using a sensor that can read a mark on the film in order to insure that a predetermined length of film is pulled off the roll and the printed portion of the film is in registration with the product. The marks on the film establish the amount of film needed to wrap the product. A sensor such as a photo sensor reads the mark and determines whether the proper length of the film has been pulled off the roll. When the amount of film pulled of the roll does not coincided with sensor reading, the distance between where the product stops and the sealing bar is varied. This allows the length of the film to be adjusted until the sensor readings and the length of the film coincides.