Blown-Film Extrusion Valve Calibration Automation

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Solution Overview

Problem

The calibration of valves in complex fluid systems, such as blown-film extrusion apparatus, is often manual, time-consuming, and expensive, with suboptimal performance due to unpredictable fluid dynamics and non-repeatable positioning characteristics, requiring frequent recalibrations which are often impractical.

Innovation Solution

An automated method for calibrating a valve between a blower and a pressure load, involving the measurement and recording of flow characteristics, particularly static pressure, using a static pressure transducer, and calculating valve position data to achieve accurate and repeatable calibration, reducing the need for costly flow sensors and minimizing labor and time.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If manual calibration is used, then the valve can be calibrated with basic equipment, but the process is time-consuming and requires trained personnel

Engineering Contradiction:

Improvecalibration equipment simplicityVSAvoidcalibration time

Core Design Contradiction:

Ease of manufactureVSLoss of time

Solution Approach 1:

The system performs self-calibration automatically using a computer to control the valve actuator and process sensor data, eliminating the need for trained personnel to manually adjust the valve while maintaining calibration accuracy

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

Manual mechanical adjustment of the valve is replaced with an automated computer-controlled system that uses an actuator to position the valve based on sensor feedback, transforming a manual mechanical process into an automated electromechanical system

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of manufacture

If manual calibration is used, then labor costs are incurred, but the process can be performed with simple equipment

Engineering Contradiction:

Improveequipment simplicityVSAvoidcalibration efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The calibration system serves itself by automatically controlling the valve actuator and processing sensor data through a computer, eliminating the need for human operators while maintaining calibration quality

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system uses sensor feedback to automatically adjust valve positioning, with the computer processing sensor data to determine optimal valve positions, creating a closed-loop calibration process that improves efficiency without requiring complex manual procedures

Inventive Principle:

Principle #23Feedback

3Reliability

If frequent recalibration is performed to maintain accuracy, then valve performance is maintained, but production time is lost

Engineering Contradiction:

Improvevalve performance accuracyVSAvoidproduction time

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system performs preliminary calibration actions during setup and uses automated monitoring to detect when recalibration is needed, reducing the frequency of manual recalibration interruptions by preparing and responding proactively to performance degradation

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The automated calibration system continuously monitors valve performance through sensor feedback and only triggers recalibration when necessary, optimizing the balance between maintaining accuracy and minimizing production interruptions

Inventive Principle:

Principle #23Feedback

4Measurement precision

If expensive flow sensors are used, then measurement precision is improved, but system cost increases

Engineering Contradiction:

Improveflow measurement accuracyVSAvoidsensor cost

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The system uses static pressure transducers as intermediary devices to indirectly measure flow characteristics, providing sufficient measurement precision for calibration purposes without requiring expensive direct flow sensors

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system accepts using lower-cost static pressure transducers rather than expensive flow sensors, recognizing that the indirect measurement approach provides adequate precision for the calibration application while significantly reducing system cost

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 method provides a cost-effective and accurate calibration process for bladder valves, improving production efficiency and accuracy by automating the calibration process, reducing the need for frequent recalibrations, and allowing the use of less expensive sensors, thereby saving labor and time.

Implementation Method 1

measuring and recording an idle flow characteristic downstream of the valve with the blower in an idle state

Methodology Applied

Scientific EffectPressure transduction: Piezoresistive Effect

Data Source

PatentUS8347686B2Automatic valve calibration of a blown-film extrusion apparatus

Publication Date: 2013.01.08 JOSEPH DANIEL R

AI summary

The present invention relates to a method of automatically calibrating a valve in a fluid flow path of a blown-film extrusion apparatus. The calibration process detects and measures a first and second pressure drop in the flow characteristic, as well as the valve position and time. The process further detects time required to achieve a steady-state in the flow characteristics. These measurements are recorded and used in calculating appropriate valve positions.