Film Feeding Control for Packaging Inertial Effects
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Solution Overview
Problem
Existing packaging methods for tissue products face challenges in maintaining packaging accuracy and control as the dimensions of the products vary, due to inertial effects during the tearing process, which affect the wrapping step and increase difficulty in managing film thickness, especially during the final braking phase.
Innovation Solution
An apparatus and method that utilize a controlled system for weakening and drawing the plastic film, applying differential forces along specific sectors of the operating path to separate and wrap the film around the product, with an automatic control system to adjust the positioning and speed ratio of drawing units to minimize inertial effects and ensure accurate wrapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the piece is pulled further after tearing to position it correctly relative to the wrapping axis, then the positioning accuracy is improved, but the inertial effects and undulation of the piece increase due to the tearing step
Solution Approach 1:
The patent applies preliminary anti-action by introducing a braking phase before the final positioning pull. The braking phase counteracts the inertial momentum generated during tearing, reducing the sail effect and undulation. This allows the subsequent positioning pull to be more accurate without being compromised by excessive inertial effects.
Solution Approach 2:
The patent implements periodic action through a multi-phase drawing control method that alternates between acceleration, constant speed, braking, and final positioning phases. This periodic control of the drawing force allows the system to manage inertial effects systematically while achieving accurate positioning of the piece relative to the wrapping axis.
2Productivity
If the dimension of the piece along the operating path decreases, then the packaging efficiency is improved, but the distance that must be covered after tearing increases, affecting the accuracy of the wrapping step
Solution Approach 1:
The patent applies dynamics by making the drawing speed and force variable throughout the process. The control system adjusts the drawing parameters dynamically based on the piece dimension and phase of operation. For smaller pieces, the system increases the braking phase duration and adjusts the final positioning pull strength to compensate for the longer distance relative to the wrapping axis, maintaining accuracy despite higher productivity.
Solution Approach 2:
The patent implements parameter changes by modifying drawing speed, acceleration, and force parameters based on the selected piece dimension. The control system stores multiple parameter sets corresponding to different article sizes and automatically selects and adjusts the appropriate parameters to maintain wrapping accuracy across varying productivity requirements.
3Loss of substance
If the thickness of the film decreases, then the material usage is optimized, but the difficulty of checking the movement of the piece during drawing after tearing increases
Solution Approach 1:
The patent replaces mechanical observation and manual control with an automated control system that uses sensors and feedback mechanisms to monitor film movement. This substitution allows for precise tracking of thin film movement during drawing and braking phases, overcoming the difficulty of visually detecting and manually controlling ultra-thin film behavior.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the position and movement of the film during the drawing and braking phases. The control system receives feedback from sensors about film tension, position, and speed, and automatically adjusts drawing parameters to maintain optimal control even when film thickness is minimized for material efficiency.
Data Source
AI summary
Described is an apparatus for packaging tissue products and a relative packaging method.