Plastic Preform Support Ring Deformation Control
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Solution Overview
Problem
Existing methods for producing plastic containers, such as beverage bottles, often result in deformities of the support ring during the heating and forming process, leading to difficulties in closing the containers and misalignment of closures, which can only be detected after production.
Innovation Solution
A method that involves determining characteristic values of the support ring's physical properties using an inspection device and adjusting treatment parameters of the heating and forming devices in real-time to prevent deformities and ensure proper alignment of closures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the temperature of the plastic preforms is increased to improve forming efficiency, then the forming speed increases, but the support ring becomes deformed due to excessive heat
Solution Approach 1:
The heating device is designed to apply heat selectively to different regions of the plastic preform with different intensities. The main body receives higher temperature heating to enable rapid forming, while the support ring region receives reduced or controlled heating to prevent deformation. This local differentiation of heating quality resolves the contradiction between overall forming speed and local structural integrity.
Solution Approach 2:
The system performs preliminary inspection of the support ring geometry before the forming process using an inspection device. Based on the measured values, the heating parameters are pre-adjusted to prevent deformation before it occurs. This proactive approach allows the system to maintain high forming temperatures while protecting the support ring from excessive heat exposure.
2Loss of time
If the heating parameters are increased to reduce production time, then the productivity increases, but the support ring deformation occurs leading to closure misalignment
Solution Approach 1:
The system incorporates an inspection device that measures support ring geometry and feeds this information back to the control unit. The control unit continuously adjusts heating parameters based on real-time measurements, maintaining optimal temperature levels that prevent support ring deformation and ensure proper closure alignment while minimizing production time.
Solution Approach 2:
The inspection device examines the support ring before heating and the control unit pre-adjusts heating parameters based on measured values to prevent deformation before it occurs. This proactive control approach eliminates the need for post-production inspection and rework, reducing overall production time while maintaining precision.
3Device complexity
If the support ring is heated along with the main body to simplify the heating process, then the device complexity is reduced, but the support ring deformation occurs
Solution Approach 1:
The heating device incorporates multiple heating zones with independently controllable temperatures. The control unit manages these zones to apply appropriate heat to each region - higher temperatures for the main body and lower temperatures for the support ring. This local differentiation maintains manufacturing precision while the automated control system prevents the process from becoming overly complex.
Solution Approach 2:
The heating system transitions from a static, uniform heating approach to a dynamic, region-specific heating strategy. The control unit continuously monitors and adjusts heating parameters for different zones based on real-time requirements, enabling precise temperature control that prevents support ring deformation while maintaining process manageability.
4Device complexity
If the inspection is performed after production to detect quality issues, then the device complexity is minimized, but the production efficiency is reduced due to rework and rejects
Solution Approach 1:
The inspection device performs measurements of the support ring geometry before the forming process. The control unit uses these measured values to adjust heating parameters proactively, preventing defects before they occur. This eliminates the need for extensive post-production inspection and rework, thereby maintaining high production efficiency without requiring an overly complex inspection system.
Solution Approach 2:
The system implements continuous feedback by measuring support ring geometry and using this information to adjust heating parameters in real-time. This closed-loop control prevents quality issues during production rather than detecting them afterward, maintaining high productivity while using a relatively simple inspection and control system.
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
This approach enables faster reaction to and proactive correction of errors, resulting in higher quality plastic containers with reduced reject rates and improved transport efficiency.
Implementation Method 1
the main bodies of the plastic preforms are heated using at least one heating device
Implementation Method 2
the heated plastic preforms are transported to a forming device for forming plastic preforms into plastic containers, and the plastic preforms are formed into the plastic containers by applying a flowable and in particular gaseous medium
Data Source
AI summary
Plastic preformed having a main body, a mouth, and a support ring, are transported along a predetermined transport path and heated using at least one heating device, and, subsequently, the heated plastic preforms are transported to a forming device for forming plastic preforms into plastic containers and are formed into the plastic containers by applying a flowable medium, wherein at least one value is determined using an inspection device, which value is characteristic of at least one physical and in particular geometric property of a support ring of a plastic preform and/or of a plastic container, and at least one treatment parameter of the heating device and/or of the forming device is controlled taking this value into account.