Electric plastic melt index meter

Electric plastic melt index meterIt refers to being at a certain temperature、loadAnd piston position conditionsBelow, plasticBy specifying the extrusion rate of the die with a specified length and inner diameter, the mass extruded within a specified time is taken asMelt qualityflow rate, abbreviated asMFR，unitg/10 minAnd the volume squeezed out within a specified time is used asmeltVolume flow rate, abbreviated asMVR，unitcm³/10 min; Flow rateIt can distinguish the viscous flow characteristics of thermoplastic in the molten state，Helps analyze the relative values of material properties and predict the relative difficulty of resin flow during processingYes, it isingredients、productionA technical indicator in the physical property testing process.

Electric plastic melt index meterforFast and accurate measurementSpecially designed,Having a structuresturdy、Simple operationFeatures such as convenience, stable and reliable performance; Using dual high-precision channelsPID constant temperature technology, temperature controlhigh precisionSmall gradient;Nitriding treatment of key components results in high strength and hardness,thermal expansionSmall deformationElectric loading and unloading of weights saves manpower and comes with automatic cutting function.

according toASTM D1238 programA (corresponding to Method A of GB/T3682.1)determination：Melt mass flow rate (MFR)
In this method, the extruded material is cut inside at a specified time, and thenprecisionWeigh the cut mass on the balance，The test result is the mass extruded in each unit of time, measured in units ofg/10 min，The obtainedMFRvalueIt is related to the cutting time and the accuracy of the measured quality.This method is used inGB/T3682The quality measurement method referred to in. 1, also known as Method A, is suitable for most plastic raw materials and products on the market,ASTM D1238 programThe mass fluidity described in A ranges from 0.15g to 50g/10 minApplicable to this method.

according toASTM D1238 programB (corresponding to Method B of GB/T3682.1)determination：Melt volume flow rate (MVR)
This method requires a displacement sensor to be arranged at the lower end of the piston rod load tray for precise monitoring of extrusionthingThe volume,volumeCalculated from the displacement distance of the piston within a certain period of time, in units ofcm³/10 min；This method requires the installation of a well sealed mouth mold baffle at the bottom of the mouth mold，To prevent the melt from flowing out of the mold during the countdownThis method is used inGB/T3682In. 1, it is called displacement measurement method, also known as method B, displacement measurement methodThe significant advantage is to eliminate the impact of mechanical cutting being unable to cut effectively due to high flow rate,andThe characteristic of synchronously recording the distance of piston displacement and testing time, while achieving high accuracy, even for materials with extremely short measurement times；For example: high flowMoving speedofPP polypropylene melt blown fabric raw material；ASTM D1238 programThe mass fluidity described in B ranges from 0.50g to 50g/10 minThis method also applies.

according toASTM D1238 programC (corresponding to GB/T3682.1 half mouth mold requirements)determination
pressGB/T3682.1-2018. Explanation on the use of mouth molds, if the MFR value of the measured material is greater than75 g/10 min，MVR value greater than 75cm³/10 min, can be usedtalldegreefor4.000mm±0.025andinsideThe diameter is1.050mm±0.005ofhalf口model.

according toASTM D1238 programDetermination of D (corresponding to GB/T3682.1 flow rate ratio)

determinationA material obtained under the same temperature but different loadsThe ratio of two values of MFR (or MVR)Flow rate ratio（FRR）It is generally used to characterize the influence of material molecular weight distribution on the rheological behavior of thermoplastic materials.

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