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This section provides an overview for capillary rheometers as well as their applications and principles. Also, please take a look at the list of 8 capillary rheometer manufacturers and their company rankings. Here are the top-ranked capillary rheometer companies as of February, 2025: 1.Qualitest International Inc., 2.SHIMADZU, 3.Dynisco.
Table of Contents
A Capillary Rheometer is a measurement device used to evaluate shear stress and viscosity of flowing materials.
Capable of measuring samples heated to high temperatures, capillary rheometers are used to evaluate the physical properties of materials such as plastics, which are solid at room temperature. Capillary Rheometers can evaluate rheological properties related to the viscosity of a material and its flowability when pressure and temperature are applied.
Rheological properties are those related to the reaction of a sample when an external force is applied to it. A solid sample, such as plastic, is heated in the apparatus until it becomes liquid. The heated sample is fed into a thin tube called a capillary and extruded at various speeds.
A capillary rheometer measures the melt viscosity relative to the extrusion speed. Note that a capillary is a capillary tube, and it is called a capillary rheometer because it evaluates physical properties by extruding a narrow passage.
Capillary Rheometers are used to process thermoplastic materials and to set discharge conditions for injection molding. In general, processing plastics requires the application of high pressure at high temperatures.
Some materials exhibit a non-linear change in viscosity (sudden decrease or sudden increase in viscosity) with respect to the applied external force, a property known as non-Newtonian liquid. Therefore, the viscosity of a sample with respect to pressure and temperature must be investigated to design optimal processing and dispensing conditions. Capillary Rheometers are used to set optimum conditions for manufacturing processes for polymers and composite materials such as plastics.
The principle of Capillary Rheometer is just like measuring the force and speed of pushing a liquid out of a syringe. A thermoplastic material is heated to make it flowable and then extruded from a cylinder into a narrow passage called a capillary die.
The shear stress and viscosity of the material at the test temperature are determined from the pressure at which the sample is extruded and the speed at which it is extruded. Depending on the device, die swell measurements, melt audibility (melt tension), and extensional viscosity measurements are also possible.
Capillary Rheometers have a narrow passage called a capillary die at one end of the cylinder and a plunger at the other end, which pushes out a heated sample. The structure of a capillary rheometer consists of a pressure gauge to measure the pressure inside the cylinder when the sample is pushed out and a plunger to measure the speed at which the plunger moves to push the sample out.
Capillary Rheometers are characterized by their ability to measure at high temperatures and high forces (high shear). Although the upper limit differs depending on the device, it can be heated up to 400°C or higher, making it effective for evaluating the viscosity of melted plastics. Shear force is also extremely high, up to 1,000,000/second, making it possible to examine the flowability of a sample when a large force is applied. Since extremely high forces are often applied during plastic processing at the time of discharge, it is important to investigate the behavior of samples when such high shear is applied.
In addition to plastic materials, capillary rheometers are also used to evaluate food products such as ketchup and mayonnaise, as well as gel cosmetics, which are subject to high shear when extruded from their containers. Capillary Rheometers can be used at room temperature, and the wide range of shear forces applied to samples and the high precision of the instrument allow for the investigation of the ejection behavior of flowable foods and cosmetics from their containers.
Capillary Rheometers can also be used to measure viscosity at different shear rates, so that in actual measurements, samples are evaluated by drawing a curve of melt viscosity versus shear rate.
*Including some distributors, etc.
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Instron, founded in 1946, is a manufacturer and supplier headquartered in Norwood, Massachusetts, USA, that specializes in providing materials testing equipment and solutions. Their range of products includes universal testing machines, impact testers, hardness testers, and accessories, which are used to evaluate the mechanical properties and performance of raw materials, components, and products. These products are widely used in industries such as automotive, aerospace, and construction. Instron is certified with ISO 9001 for quality management and ISO 17025 for calibration service.
NETZSCH Pumps & Systems GmbH, established in 1873 in Germany, is a manufacturer and supplier of advanced pumping solutions and systems for various industries. The company’s comprehensive product range includes progressive cavity pumps, rotary lobe pumps, and multi-screw pumps, among others. These technologies find applications in sectors such as chemical, food and beverage, pharmaceutical, and environmental engineering. NETZSCH Pumps & Systems' expertise lies in providing efficient and effective pumping solutions tailored to the specific needs of their customers. With a rich history spanning more than a century, NETZSCH enhances the advancement of fluid handling and pumping technology, increasing processes across diverse industries.
Dynisco, founded in 1965 and headquartered in West Chester, Pennsylvania, is a manufacturer and supplier of flow control products. The company’s product range entails flow meters, flow controllers, flow switches, flow sensors, and flow conditioners. It caters to diverse industries, including oil and gas, chemical, pharmaceutical, food and beverage, water treatment, and power. Offering design, engineering, certification, supply chain management, and technical support services, the company is devoted to delivering inventive and dependable flow control solutions. With ISO 9001:2015 certification, the company adheres to rigorous quality standards.
Qualitest International Inc., founded in 1999, is a supplier of testing equipment such as hardness testers, material testing equipment, universal testing machines, and instruments for testing rubber, metals, paper, plastic, paint, and packaging materials used in the gold and jewelry, mining, oil and gas, surveying, and ultrasonic industries. The Lauderdale, Florida-based business offers technical support, calibration, and repair either directly or through the global QualiService authorized network. The company has an online store with international shipping.
YASUDA SEIKI SEISAKUSHO, LTD., founded in 1955 with headquarters in Japan, is a manufacturer of material testing machines. The company's wide range of products includes rubber testing machines, electrical and magnetic wire testing machines, leather testing machines, and dye testing machines. YASUDA SEIKI SEISAKUSHO, LTD.'s testing machines are used to evaluate and quantify the physical properties of materials and can be found in research, industrial, commercial, and governmental organizations. The company offers customer support, including repairs and troubleshooting services.
SHIMADZU established in Duisburg, Nordrhein-Westfalen, in 1968 is a manufacturer of Analytical and Measuring Instruments and medical systems. Their product portfolio includes analytical instruments, including spectrophotometers, chromatography systems, mass spectrometers, and elemental analyzers, used for precise chemical analysis and research. The company serves industries such as Pharmaceutical and Biotechnology, Research and Development and Chemical and Petrochemical. The company has a global distribution channel and the company also offers customer services that include support, custom research projects and customized services.
Ranking as of February 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Qualitest International Inc. |
20.8%
|
| 2 | SHIMADZU |
19.2%
|
| 3 | Instron |
15.8%
|
| 4 | Dynisco |
14.2%
|
| 5 | NETZSCH Pumps & Systems |
12.5%
|
| 6 | YASUDA SEIKI SEISAKUSHO, LTD. |
10.0%
|
| 7 | Goettfert Inc. |
4.2%
|
| 8 | GÖTTFERT Werkstoff-Prüfmaschinen GmbH |
3.3%
|
Derivation Method
The ranking is calculated based on the click share within the capillary rheometer page as of February 2025. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
United States of America
|
4 | 50.0% |
|
Germany
|
3 | 37.5% |
|
Japan
|
1 | 12.5% |
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