he common way of measuring the melt flow rate of thermoplastics

ASTM D1238 Standard method Melt Flow Index Tester machine device

1. ขอบเขต
1.1 This test method covers the determination of the rate of
extrusion of molten thermoplastic resins using an extrusion plastometer.
1.2 The values stated in SI units are to be regarded as standard.
1.3 มาตรฐานนี้ไม่ได้มุ่งหมายที่จะจัดการกับข้อกังวลด้านความปลอดภัยทั้งหมด, ถ้ามี, ที่เกี่ยวข้องกับการใช้งาน. It is the
responsibility of the user of this standard to establish appropriate safety, สุขภาพ, และการปฏิบัติด้านสิ่งแวดล้อมและกำหนดการบังคับใช้ข้อ จำกัด ด้านกฎระเบียบก่อนใช้งาน.
NOTE 1—This standard and ISO 1133 address the same subject matter, but differ in technical content.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical
Barriers to Trade (จะแจ้งภายหลัง) คณะกรรมการ.

Melt flow rate (MFR, เช่น. Melt Flow Rate) refers to the weight of the melt passing through the standard die of the melt flow rate meter every 10 minutes under a certain temperature and load. It is also called melt index (MI, เช่น. Melt Index). MFR indicates the flow properties of thermoplastics in a high-temperature viscous flow state. It is one of the important parameters for the processing and molding of polymer materials, and indicates the relative value of the viscosity of thermoplastic melts. The MFR of thermoplastics varies with their molecular weight and molecular structure. For polymers of a certain structure, a large MFR indicates that the molecular weight of the polymer is small, and the flow properties are better during processing. During processing, the temperature can be slightly higher than the temperature, and the applied pressure can be smaller. ในทางตรงกันข้าม, if the MFR is small, it indicates that the molecular weight of the polymer is large, and the flow properties are worse during processing. The processing temperature must be appropriately increased and a larger pressure must be applied to improve the fluidity of the polymer. อย่างไรก็ตาม, when the MFR is large, the properties of the polymer such as breaking strength and hardness are reduced.

GA-1002 Melt Flow Index Tester

1. Install and debug the melt flow rate meter.
2. Turn on the power. Perform the following operations in sequence: set to time-controlled sampling; press the reset key; press the Mon key to enable the display
3. Reset: set parameters ((1) preset test load, เช่น 2160 (ก)-W key; (2) preset experimental temperature, 230℃ for polypropylene (พีพี) and 190℃ for polyethylene (วิชาพลศึกษา). ตัวอย่างเช่น, 190 (ค)-T key: (3) preset sampling time such as 30 (ส)-t*d/m key); press the QD key to start the work, and the display automatically displays the actual temperature.
3. Weigh the sample, and the sample addition amount and cutting time are shown in Table 3-3. Measure MFR after drying
4. Clean the material cylinder of the melt flow rate meter.
5. After the rate meter is heated to 190℃, put in the piston rod for preheating. After the temperature is constant, remove the piston rod and load the material into the cylinder through the bucket. Add a small amount, compact it with the loading rod, and then add a small amount, repeat until all the material is added. This can prevent bubbles from existing in the barrel. After the material is loaded, put the pressing piston (the load itself is 3.187N). Preheat for 5 นาที. After the temperature is constant, press 21.18N load on the pressing piston rod.
6. When the first scale line of the pressing piston rod is parallel to the loading port, cut off the extruded material strip and discard it. ในเวลาเดียวกัน, start timing. When the preset cutting time is reached, cut the first sample and measure 5 samples at a time. When the second scale line is balanced with the loading port, stop cutting. The same sample is generally measured 3 ถึง 5 ครั้ง. Weigh each section of the material strip. Note the weight of the material strip and calculate the average weight.
7. Enter the average weight value (in g), press the tdm key, and give the melt flow rate MFR8. Clean the barrel and the discharge port, wipe the material cylinder and the piston rod. Turn off the machine and cut off the power.

เว็บไซต์：

https://www.gonoava.com/product/ga-1001-b-touched-screen-melt-flow-index-tester/

Instrument and source of operation ：https://www.gonoava.com

Our machine GA-1002 is designed according to this standard and is currently widely used internationally.
Contact

อีเมล: arlenliu@gonoava.com

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If you have any questions you can send me a message or email.