Measurement of plastic melt flow rate

The You'er Hongxin Testing Laboratory can accurately test the physical properties (transmittance, ash content, etc.), mechanical properties (hardness, wear resistance, etc.), and thermal properties (hot deformation temperature, etc.) of plasticsMeasurement of plastic melt flow rateEquipped with tablet press, impact tester, electrical performance and combustion performance, etcDMAWaiting for advanced instruments. It can ensure the quality of raw materials and provide technical services such as failure analysis. With a wide testing range and strong professionalism, it provides a full cycle solution for the plastic industry.

Measurement of plastic melt flow rateIncluding the mass flow rate of plastic melt（MFR）Volume flow rate of the melt（MVR）

Melt mass flow rate（MFR）The mass of molten material passing through a standard die capillary tube per unit time under specific temperature and pressure conditions, measured in units ofg/10minAccording to international standardsISO 1133orASTM D1238determination.

Melt volume flow rate（MVR）Under the same conditions, the volume of molten material passing through a standard die capillary tube per unit time, in units ofcm³/10min.MVR = MFR÷ Melt density (converted by mass and volume).

MFRActual use

Processing performance evaluation:

MFRThe higher the plastic, the better its flowability, making it suitable for forming thin-walled or complex structures (such as injection molding, blow molding).

MFRLow filling may lead to insufficient filling or processing difficulties (such as thick walled parts).

Production optimization:

Guide the adjustment of injection molding machine parameters (temperature, pressure, speed) to improve efficiency.

Assist in mold design (gate, runner dimensions).

Quality Control:

Monitor the consistency of raw material batches to avoid product defects (such as bubbles and warping) caused by differences in fluidity.

Material research and development:

Evaluate the influence of polymer molecular weight distribution and additives (such as plasticizers and fillers) on flow performance.

MVRActual use

More comprehensive analysis of viscous flow characteristics:

MVRReflects the viscoelastic behavior of the melt from a volumetric perspective, especially suitable for high viscosity or non Newtonian fluids (such as engineering plastics, composite materials).

Process optimization:

combineMVRandMFRIt can more accurately predict the behavior of the melt during processing, such as shear sensitivity.

Cost control:

passMVROptimize the filling speed of the melt to reduce energy consumption and scrap rate.

Application scenarios

MFR: Universal plastics（PEThePPThePS）Routine testing to quickly determine material suitability.

MVRPolymer materials (such asPOMThePA）Fine craftsmanship design for composite materials such as fiber-reinforced plastics.

detection method

Melt flow rate meter（Melt Flow Indexer）The core components include a heating furnace, a material cylinder, a piston rod, and a standard die (usually with an inner diameter of2.095mm）.

Standard:

ISO 1133Suitable for thermoplastic materials, with specified temperature, pressure, and mold specifications.

ASTM D1238American Society for Testing and Materials standards, similar conditionsISO 1133.

Melt flow rate（MFR）And melt index（MI）The difference：