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Application Notes
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공압출 캡층 두께 측정


Application: Measurement of individual layers and total thickness in coextruded plastic, both raw sheet stock and molded products.

Background: Sheet stock of engineering thermoplastics such as acrylonitrile butadiene styrene (ABS) and acrylic, used to form a wide variety of molded consumer products such as automotive interior parts, refrigerator shelves, and plastic window frames, is sometimes produced as two coextruded layers, an outer cap layer that provides cosmetic properties such as a glossy surface, and a base layer that optimizes structural properties. Manufacturers and fabricators need to measure the thickness of the cap layer as well as total product thickness to insure compliance with specifications.
Equipment: It is often possible to measure cap layer, base layer, and total thickness both in the sheet stock and in the final molded product using a Model 38DL PLUS thickness gage with the optional Multi-Measurement software and a common delay line transducer such as an M208-RM (20 MHz) or an M202-RM (10 MHz). Cap layers may often be measured down to a minimum thickness of 0.008 in. (0.20 mm) or less. The primary limitation on ultrasonic testing of this class of products is that occasionally the cap layer and base layer are both made materials with very similar acoustic properties, in which case there can be insufficient reflection from the boundary between them to measure the layers separately. For this reason, performance should be evaluated on samples of the actual product to be measured. Total product thickness can be measured in all cases.

Typical Procedure: The waveforms below show simultaneous measurement of cap layer and base layer in a typical coextruded ABS plastic part, using an M208 transducer. The echoes seen on the screen represent the outer surface of the part, the boundary between the cap layer and the base layer, and the inner surface of the part.


cap layer measurement



base layer measurement

As with any ultrasonic thickness measurement, accuracy is dependent on proper sound velocity calibration. Velocity calibration must be performed for each material being measured, on samples of known thickness.

Olympus IMS

이 애플리케이션에 사용되는 제품
45MG 고급 초음파 두께 측정기에는 표준 측정 기능은 물론 다양한 소프트웨어 옵션이 있습니다.이 독특한 두께 측정 도구는 당사의 이중 요소 및 단일 요소 두께 측정 탐촉자와 호환됩니다.

다용도로 활용 가능한 38DL PLUS™ 측정기를 이중 요소 탐촉자와 함께 사용하면 부식된 파이프의 두께를 측정할 수 있으며, 단일 요소 탐촉자를 사용하면 박층 또는 다층 소재의 두께를 매우 정확하게 측정할 수 있습니다.

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