Thermoplastic Container Blow-Molding With Automated Thickness Calibration
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Solution Overview
Problem
Existing methods for producing thermoplastic containers are inefficient and time-consuming due to the need for manual adjustment of numerous parameters, leading to non-conformities and increased production costs, especially in adjusting the heat treatment and shaping phases, without ensuring consistent material distribution.
Innovation Solution
A method involving a calibration step that includes measuring and storing wall thicknesses at different heights, modifying control parameters based on correction coefficients, and iteratively adjusting these parameters to achieve desired thicknesses, using a control unit to optimize the heating and shaping processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual adjustment of numerous parameters is performed to control heating and shaping units, then manufacturing precision can be improved, but device complexity and loss of time increase significantly
Solution Approach 1:
The patent implements a feedback mechanism where wall thickness is measured at multiple heights during production, and the control unit automatically adjusts heating and shaping parameters based on these measurements. This closed-loop system eliminates the need for manual parameter tuning while maintaining precise control over container thickness consistency throughout the production process.
Solution Approach 2:
The control unit autonomously manages the complex parameter adjustments by receiving thickness measurements and automatically modifying heating unit power, heating time, and shaping parameters. The system serves itself by eliminating the need for operator intervention in parameter tuning, reducing both complexity and time loss while maintaining manufacturing precision.
2Manufacturing precision
If preliminary tests and manual parameter adjustment are performed for each container format and material change, then manufacturing precision is improved, but productivity decreases due to time loss
Solution Approach 1:
The system performs preliminary measurement of wall thickness at multiple heights during the production process itself, rather than requiring separate preliminary tests before production. The control unit uses these initial measurements to automatically adjust parameters in real-time, eliminating the need for time-consuming pre-tests for each container format and material change while maintaining conformity to specifications.
Solution Approach 2:
The feedback-based parameter adjustment occurs continuously during production rather than requiring discrete preliminary tests. The control unit continuously monitors wall thickness and makes real-time adjustments, maintaining manufacturing precision without interrupting the production flow. This continuous action eliminates downtime associated with retesting after format or material changes.
3Manufacturing precision
If operator knowledge and manual tuning are required to adjust parameters for different hollow body designs, then manufacturing precision is improved, but loss of time increases
Solution Approach 1:
The control unit receives real-time wall thickness measurements at multiple heights and automatically adjusts heating and shaping parameters based on this feedback. This eliminates the need for operators to manually tune parameters for different hollow body designs, as the system self-adjusts to maintain precise control over container shape and thickness without time loss.
Solution Approach 2:
The patent replaces the mechanical process of manual parameter adjustment by operators with an automated control system that uses electronic sensors and computational algorithms. The control unit processes thickness measurements and automatically modifies process parameters, substituting human expertise with an automated system that achieves the same precision without time investment.
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
Enables rapid and precise adjustment of production parameters to maintain consistent container thickness, reducing non-conformities and production downtime, thus enhancing efficiency and quality.
Implementation Method 1
a first phase of heating the hollow bodies, during which a succession of hollow bodies is heated in the heating unit to a reference temperature at which the hollow bodies are in a malleable state
Implementation Method 2
a fluid under pressure is injected into each hollow body by the corresponding injection device or nozzle to confer on the preform the final shape of the container. The fluid under pressure is usually a gas such as air.
Implementation Method 3
shaping generally includes a stretching phase performed by a mobile stretching rod adapted to apply a stretching force to the bottom of a hollow body in a mold in order to stretch the preform along its axis
Data Source
AI summary
Described is a method for producing thermoplastic material containers by blow-molding or stretch-blow-molding a hollow body previously heated in an oven and placed in a mold. The method includes a preliminary calibration step of: producing containers on the basis of first control parameters; measuring the wall thickness on extraction from the mold at two or more different heights; storing a reference thickness in a memory unit; modifying at least one control parameter; measuring the wall thickness at two or more different heights after the modification of each control parameter; storing the thicknesses; comparing said stored measured thicknesses with theoretical thicknesses that would have been obtained after modification of the control parameter(s) according to predetermined correction coefficients; and modifying the predetermined correction coefficients so that the thicknesses measured after modification of the control parameter(s) correspond to the theoretical thicknesses that would have been obtained with the aforementioned predetermined coefficients.