Novel design of extension nozzle and its application on real-time injection molding process diagnosed by ultrasound

Wu, Yilin; Cheng, Chin‐Chi; Kobayashi, Makiko; Yang, Che‐Hua

doi:10.1016/j.sna.2017.06.023

Cited by 9 publications

(4 citation statements)

References 12 publications

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“…In 2017 [ 56 ], they modified the extension nozzle of an injection moulding machine to a T-shaped nozzle which provides a space for installing sensors. Figure 8 a indicates the designed extension nozzle with the ultrasonic transducer and the signal echoes for a polypropylene (PP) moulded part.…”

Section: High-temperature Ultrasonic Transducers (Htut) By Sol-gel Techniquementioning

confidence: 99%

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Ultrasound Sensors for Process Monitoring in Injection Moulding

Kariminejad

Tormey

Huq

et al. 2021

Sensors

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Injection moulding is an extremely important industrial process, being one of the most commonly-used plastic formation techniques. However, the industry faces many current challenges associated with demands for greater product customisation, higher precision and, most urgently, a shift towards more sustainable materials and processing. Accurate real-time sensing of the material and part properties during processing is key to achieving rapid process optimisation and set-up, reducing down-times, and reducing waste material and energy in the production of defective products. While most commercial processes rely on point measurements of pressure and temperature, ultrasound transducers represent a non-invasive and non-destructive source of rich information on the mould, the cavity and the polymer melt, and its morphology, which affect critical quality parameters such as shrinkage and warpage. In this paper the relationship between polymer properties and the propagation of ultrasonic waves is described and the application of ultrasound measurements in injection moulding is evaluated. The principles and operation of both conventional and high temperature ultrasound transducers (HTUTs) are reviewed together with their impact on improving the efficiency of the injection moulding process. The benefits and challenges associated with the recent development of sol-gel methods for HTUT fabrication are described together with a synopsis of further research and development needed to ensure a greater industrial uptake of ultrasonic sensing in injection moulding.

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Section: High-temperature Ultrasonic Transducers (Htut) By Sol-gel Techniquementioning

confidence: 99%

“… Fabricated sol-gel ultrasound sensor at the nozzle; ( a ) cross-section of the nozzle with the probes; ( b ) the measured temperature for PP by a thermocouple [ 56 ]. …”

Section: Figurementioning

confidence: 99%

Ultrasound Sensors for Process Monitoring in Injection Moulding

Kariminejad

Tormey

Huq

et al. 2021

Sensors

View full text Add to dashboard Cite

show abstract

“…Specifically, a high temperature ultrasonic transducer was invented and applied in microinjection molding [45], coinjection molding [46], and gas-assisted injection molding processes [47] for online polymer characterization. By installing high temperature ultrasound transducers at the nozzle location, Wu et al [48,49] revealed the flow characteristics of the polymer melt and the flow conditions at the nozzle. e melt flow characteristics at the nozzle, including…”

Section: Ultrasound Ultrasound Waves Are Mechanical Wavesmentioning

confidence: 99%

Intelligent Injection Molding on Sensing, Optimization, and Control

Zhao

Zhang

Dong

et al. 2020

Advances in Polymer Technology

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Injection molding is one of the most significant material processing methods for mass production of plastic products. It is widely used in various industry sectors, and its products are ubiquitous in our daily life. The settings and optimization of the injection molding process dictate the geometric precision and mechanical properties of the final products. Therefore, sensing, optimization, and control of the injection molding process have a crucial influence on product quality and have become an active research field with abundant literature. This paper defines the concept of intelligent injection molding as the integral application of these three procedures—sensing, optimization, and control. This paper reviews recent studies on methods for the detection of relevant physical variables, optimization of process parameters, and control strategies of machine variables in the molding process. Finally, conclusions are drawn to discuss future research directions and technologies, as well as algorithms worthy of being explored and developed.

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“…The fundamental properties of ultrasonic signals include reflection and transmission coefficients, velocity, attenuation and scatter signals given off from the materials. These signatures have specific relationships with properties of materials [24], process variations [25] and sample quality [26]. Ultrasonic echoes can also detect the temperature [27,28] and pressure [29] of a material.…”

Section: Introductionmentioning

confidence: 99%

An Innovative Ultrasonic Apparatus and Technology for Diagnosis of Freeze-Drying Process

Cheng

Tseng²,

Huang

2019

Sensors

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The freeze-drying process removes water from a product through freezing, sublimation and desorption procedures. However, the extreme conditions of the freeze-drying environment, such as the limited space, vacuum and freezing temperatures of as much as −50 °C, may block the ability to use certain diagnostic sensors. In this paper, an ultrasonic transducer (UT) is integrated onto the bottom of a specially designed frozen bottle for the purpose of observing the freeze-drying process of water at varying amounts. The temperatures and visual observations made with a camera are then compared with the corresponding ultrasonic signatures. Among all of the diagnostic tools and technologies available, only ultrasonic and visual records are able to analyze the entire progression of the freeze-drying process of water. Compared with typical experiment settings, the indication of drying point for water by the amplitude variations of ultrasonic L3 echo could reduce the process period and energy consumption. This study demonstrates how an innovative frozen bottle, an integrated ultrasonic sensor and diagnostic methods used to measure and optimize the freeze-drying process of water can save energy.

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Novel design of extension nozzle and its application on real-time injection molding process diagnosed by ultrasound

Cited by 9 publications

References 12 publications

Ultrasound Sensors for Process Monitoring in Injection Moulding

Ultrasound Sensors for Process Monitoring in Injection Moulding

Intelligent Injection Molding on Sensing, Optimization, and Control

An Innovative Ultrasonic Apparatus and Technology for Diagnosis of Freeze-Drying Process

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