Flow-Wrapping Jaw Sealing Control for Paper-Rich Film Speed Changes
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Solution Overview
Problem
Sustainable film materials with high paper content in tubular bag production suffer from low tear resistance, leading to inadequate sealing quality during acceleration and deceleration phases, resulting in high reject rates.
Innovation Solution
Adjust sealing parameters such as sealing time, path, temperature, and pressure of transverse jaws based on the film web's conveying speed to maintain consistent energy input and prevent tearing during acceleration and deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the tubular bag machine operates at high speed to improve productivity, then the sealing quality deteriorates during acceleration and deceleration phases due to insufficient sealing time
Solution Approach 1:
The sealing parameters (temperature, pressure, speed) are made dynamic and adjustable during different operational phases. The control unit modifies sealing parameters based on the current conveying speed, ensuring optimal sealing quality both at high speed and during acceleration/deceleration phases.
Solution Approach 2:
The patent changes sealing parameters (temperature, pressure, sealing speed) as functions of the conveying speed. During acceleration phases when speed is low, the system adjusts parameters to maintain sufficient sealing quality, while at target speed optimal parameters are applied.
2Manufacturing precision
If the conveying speed is reduced during acceleration phase to improve sealing quality, then the productivity deteriorates due to longer production time
Solution Approach 1:
The system dynamically adjusts sealing parameters according to the actual conveying speed during acceleration phases, allowing the machine to maintain high productivity while ensuring sealing quality is not compromised during speed transitions.
Solution Approach 2:
The control unit receives feedback on the conveying speed and automatically adjusts sealing parameters accordingly. This feedback mechanism ensures that sealing quality is maintained throughout the acceleration phase without requiring manual intervention or production delays.
3Manufacturing precision
If the sealing time is increased to improve sealing quality, then the energy input into the sealing zone increases causing the sealing zone to burn
Solution Approach 1:
The sealing parameters (temperature, pressure, time) are dynamically adjusted based on conveying speed. During acceleration phases when speed is low, the system reduces sealing time and adjusts temperature/pressure to prevent excessive heat input, while maintaining sufficient sealing quality.
Solution Approach 2:
The system replaces fixed mechanical sealing parameters with a controlled, variable parameter system that responds to speed changes. This substitution allows precise control of energy input to prevent burning while ensuring adequate sealing.
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 high-quality sealing of tubular bags with high paper content throughout the production process, reducing reject rates and enabling efficient processing of films with at least 95% paper without tearing.
Implementation Method 1
the sealing path along which the transverse jaws are in contact with the sealable web can be changed... to introduce the necessary heat into the sealing zone of the film material by means of the transverse jaws
Implementation Method 2
it is also possible to change the sealing pressure with which the film web is sealed by the transverse jaws as a function of the current conveying speed
Data Source
AI summary
A method for operating a tubular bag machine having a film web capable of unwinding from a supply reel, a shoulder for forming the web into a film tube, a take-off unit serving to move the tube, a longitudinal sealing device for welding the tube parallel to its transport direction by a longitudinal seam, a sealing device with jaws for producing transverse seams in the tube, a separating element for separating finished tubular bags from the tube, the machine being accelerated in a positive acceleration phase from an initial speed to a target speed when starting or being decelerated in a negative acceleration phase from the target speed to a final speed for stopping, wherein, in the positive acceleration phase and/or in the negative acceleration phase, at least one sealing parameter of the jaws for producing tubular bags changes as a function of the conveying speed of the web.