-Unlicensed-塑料工藝性能測試英語

1、tt Plastic process performance test 主講人：楊崇嶺Melting indexTorque RheometerWords and Expressionscapillary雙毛細(xì)管 alternative替代 gravimetric重量 correlate k:rlet v. 聯(lián)系n. 相關(guān)物;相關(guān)聯(lián)的人 rheological流變 screw螺桿 compress壓縮 shear剪 elongation伸長 conditions kndnz n. 狀況;環(huán)境;Words and Expressionstvorque rheometer 轉(zhuǎn)矩流變儀 plasti

2、cizing 塑化shear stability 剪切穩(wěn)定性dynamic 動態(tài) circumstances 情況 accurate kjrt adj. 精確的，準(zhǔn)確的;reliable for 可靠的multi-component 多組分 integrated ntretdadj. 完整的;整體的;結(jié)合的;viscosity粘度spectrum spktrm n. 光譜;波譜;范圍;系列 1Melt flow indexThe melt flow index (MFI) is a measure of the ease of flow of the melt of a thermoplast

3、ic polymer. It is defined as the mass of polymer, in grams, flowing in ten minutes through a capillary of a specific diameter and length by a pressure applied via prescribed alternative gravimetric weights for alternative prescribed temperatures . 1Melt flow indexPolymer processors usually correlate

4、 the value of MFI with the polymer grade that they have to choose for different processes, and most often this value is not accompanied by the units, because it is taken for granted to be g/10min. Similarly, the test load conditions of MFI measurement is normally expressed in kilograms rather than a

5、ny other units. The method is described in the similar standards ASTM D1238 and ISO 1133.2MFI、 MFR and MIConfusingly, MFR may also indicate “melt flow ratio”, the ratio between two melt flow rates at different gravimetric weights. More accurately, this should be reported as flow rate ratio（FRR）, or

6、simply flow ratio. Flow rate ratio is commonly used as an indication of the way in which rheological behavior is influenced by the molecular mass distribution of the material.2MFI, MFR and MIThe MFI device is not an extruder in the conventional polymer processing sense in that there is no screw to c

7、ompress, heat and shear the polymer. MFI additionally does not take account of long chain branching nor the differences between shear and elongation rheology . Therefore, two polymers with the same MFI will not behave the same under any given processing conditions.3Torque RheometerTorque rheometer i

8、s an ideal equipment of material flow, plasticizing, heat, shear stability, the rheometer provides a dynamic measurement method is more close to the actual processing, the actual processing in similar circumstances, accurate and reliable for the determination of rheological properties of materials,

9、such as continuous, multi-component materials mixing, thermosetting resin the cross linked elastomer material, curing, dynamic stability and screw speed effects on the system processing performance. 4The function of Torque Rheometer Torque rheometer is the process by computer control, it adopts a la

10、rge scale integrated block, instrument data acquisition and processing control and experimental data by corresponding software, it is not only the instrument has the advantages of convenient operation, accurate control, data processing and result output is fast and efficient, more importantly, in support of the software. 4The function of Torque Rheometer Complete the traditional torque rheometer can complete the function, for example, shear sensitive charac