Stretch Blow Molding Pre-Blow Curve Control After Parameter Changes
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Solution Overview
Problem
In stretch-blow molding machines, changes in operating parameters, such as using preforms with different characteristics, disrupt the regulation system, leading to a drift in the pre-blowing phase and reduced productivity, as manual intervention is required to resume regulation.
Innovation Solution
A method that includes an initialization phase to set up and memorize operating parameters, a regulated production phase with automatic updating of parameters based on real-time measurements, and a stabilization phase to correct reference points, allowing the system to adapt to changes without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual intervention is required to reset reference points after operator changes, then regulation can resume, but productivity decreases and time is lost
Solution Approach 1:
The regulation system automatically detects operator-imposed parameter changes and performs self-recalibration without requiring manual intervention. The system monitors its own operation, identifies when recalibration is needed, and executes the recalibration process autonomously, thereby maintaining productivity while ensuring regulation reliability.
Solution Approach 2:
The system performs preliminary detection of parameter changes and prepares for recalibration before actual drift occurs. By monitoring operating parameters in real-time and anticipating the need for recalibration, the system can schedule and execute the recalibration process during optimal moments, minimizing disruption to production cycles.
2Adaptability or versatility
If operator changes operating parameters to adapt to new preforms, then adaptability improves, but regulation drifts and requires manual reset
Solution Approach 1:
The system continuously monitors operating parameters and pre-blowing characteristics, comparing actual values against reference points. When operator-induced parameter changes cause deviation beyond acceptable thresholds, the feedback mechanism triggers automatic recalibration, ensuring the regulation system adapts to new operating conditions while maintaining reliability.
Solution Approach 2:
The regulation system transitions from a static reference point approach to a dynamic adaptation mechanism. The system can adjust reference points automatically in response to operator changes, allowing the regulation to evolve with changing production requirements while maintaining stability through controlled recalibration processes.
3Manufacturing precision
If regulation is suspended for manual reset, then accuracy can be restored, but production time increases
Solution Approach 1:
The automatic recalibration system enables continuous production without interruption. By performing recalibration autonomously during or between production cycles, the system maintains manufacturing precision while eliminating the time loss associated with manual intervention and production suspension.
Solution Approach 2:
The system accelerates the recalibration process by executing it automatically and efficiently without the delays inherent in manual operations. The automated detection and adjustment mechanism can perform recalibration faster than manual processes, reducing the time impact on production cycles while ensuring precision is restored.
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 continuous regulation and maintains productivity by automatically updating parameters in response to changes, eliminating the need for manual recalibration and reducing defects in container production.
Implementation Method 1
a pre-blowing solenoid valve (17) capable of putting the preform (3) into communication with said source of fluid according to a pre-blowing flow rate (Dp)
Implementation Method 2
injecting a pressurized fluid into the preform (3) to form a container
Implementation Method 3
injecting a fluid under reduced pressure, called pre-blowing... into the preform so as to form a bubble
Implementation Method 4
heating a plastic preform to the preform's glass transition temperature
Data Source
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AI summary
A method for regulating the cyclic production of containers (2) by stretch blow molding from preforms (3), comprising: a) an initialization phase of a plurality of machine operating parameters (1) during the production cycle, and of control parameters including at least one reference position (Ac, Bc, PCab, Fc) of at least one characteristic point (A, B, Pab, F) of a pre-blow curve, b) a regulated production phase during which: b1) the pre-blow curve is measured and stored, and a real time and/or a real pressure is calculated corresponding to said characteristic point (A, B, Pab, F), and b2) a new value of at least one machine operating parameter (1) is calculated as a function of a difference between the real time and the reference time and/or between the real pressure and the reference pressure,characterized in that the regulated production phase includes a monitoring step b3) of any change imposed by the operator of a value of a machine operating parameter (1), and further comprising an automatic update phase of the control parameters including: c1) a stabilization step during which production is continued and actions b1) are executed, and actions b2) are suspended, and c2) a correction step of the reference time and/or reference pressure according to the actual time and/or actual pressure values stored during the stabilization step, in order to continue the regulated production phase.