Developing a Method for Ultrasonic Quality Control of Plastic Products Obtained by Rotary Moulding Method

Rotational moulding of plastics is rapidly developing in the world today. However, with this method of processing, “microbubbles” can occur in the walls of products, considerably impairing their quality. In this paper, the method of ultrasonic testing (UST) is applied to assess the quality of plasti...

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Bibliographic Details
Published inRussian journal of nondestructive testing Vol. 57; no. 11; pp. 962 - 967
Main Authors Gaisin, R. S., Tyukanko, V. Yu, Demyanenko, A. V.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.11.2021
Springer Nature B.V
Subjects
Acoustic Methods
Amplitudes
Characterization and Evaluation of Materials
Chemistry and Materials Science
Inspection
Materials Science
Parameters
Product quality
Quality assessment
Quality control
Rotational molding
Structural Materials
Surface roughness
Ultrasonic testing
product quality control
rotational molding
ultrasonic testing
plastic products
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Summary:Rotational moulding of plastics is rapidly developing in the world today. However, with this method of processing, “microbubbles” can occur in the walls of products, considerably impairing their quality. In this paper, the method of ultrasonic testing (UST) is applied to assess the quality of plastic products. With the help of an echo method at a working frequency of 2.5 MHz, samples of various degrees of quality were analyzed. It has been revealed that the propagation speed of an ultrasonic signal does not depend on the degree of product quality and is m/s. It has been found that the larger the surface roughness parameter Rz of the products (from 2.5 to 20 μm), the smaller the amplitude of the bottom signal becomes. An underheated sample is determined by the values of parameter from –6.0 to –15.0 MHz. A reference sample was established ( g/cm 3 ) for calibrating the flaw detector; for this sample dB at an operating frequency of 2.5 MHz. The relationship between the density/heating of products and the amplitude of the bottom signal has been revealed. The possibility of detecting internal defects of products by ultrasonic inspection has been proven. A new method is proposed for identifying suitable articles in production using which it is possible to determine the degree of product quality.
ISSN:1061-8309
1608-3385
DOI:10.1134/S1061830921110085