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Related Concept Videos

Precipitation Gravimetry01:03

Precipitation Gravimetry

Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
Precipitation Processes01:12

Precipitation Processes

The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
Volatilization01:10

Volatilization

Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
Specific Gravity of Aggregate01:19

Specific Gravity of Aggregate

Aggregates typically contain pores, which can be either permeable or impermeable. Considering the pores in the aggregates, the specific gravity of aggregates is defined in three different forms, namely, bulk or gross specific gravity, apparent specific gravity, and absolute specific gravity.
Bulk or gross specific gravity is calculated by taking the ratio of the mass of aggregates in the saturated surface-dry state to the total volume that includes both the solids and the voids within the...
Moisture Content and Bulking of Aggregate01:10

Moisture Content and Bulking of Aggregate

The moisture content of aggregates is a crucial factor in construction, particularly in concrete mixing, as it influences the total water required in the mix. Moisture content represents the water coated on the exterior surface of the aggregate existing in a saturated and surface-dry condition. The total water content of a moist aggregate is the sum of its moisture content and water absorption.
When aggregates are exposed to rain or sit in stockpiles, they absorb moisture, which must be...

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Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes
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Method Development for the Prediction of Melt Quality in the Extrusion Process.

Dorte Trienens1, Volker Schöppner1, Peter Krause2

  • 1Kunststofftechnik Paderborn, Paderborn University, 33098 Paderborn, Germany.

Polymers
|May 11, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a new simulation model to predict polymer melt quality during extrusion. Using machine learning, it correlates process parameters with melt quality, improving extrusion screw design and reducing development time.

Keywords:
machine learningmelt qualitypolymer extrusion processscrew performance indexsimulation

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Area of Science:

  • Polymer processing
  • Materials science
  • Computational modeling

Background:

  • Simulation models are crucial for designing polymer extruders and extrusion screws, reducing the need for physical prototypes and shortening development cycles.
  • Current simulation tools can predict temperature and pressure curves but cannot accurately determine the resulting melt quality.
  • Melt quality is a critical factor in polymer product performance, and its prediction remains a challenge in the industry.

Purpose of the Study:

  • To develop a novel simulation model capable of predicting melt quality in the polymer extrusion process.
  • To establish a reliable method for assessing and improving melt quality based on simulation data.
  • To leverage artificial intelligence, specifically machine learning, to bridge the gap between process simulation and melt quality prediction.

Main Methods:

  • Utilized existing simulation data, including temperature and pressure curves, as input variables.
  • Developed a machine learning model, specifically linear regression, to predict melt quality.
  • Established the screw performance index as a key target value, correlating it with material and thermal homogeneity.

Main Results:

  • A linear regression model was successfully built using simulation results as input.
  • The model determined the correlation between extrusion process parameters and the final melt quality.
  • The developed model's quality and predictive capabilities for melt quality were evaluated.

Conclusions:

  • The study successfully demonstrates a simulation-based approach for predicting polymer melt quality.
  • The integration of machine learning with extrusion process simulations offers a powerful tool for optimizing polymer processing.
  • This model can significantly aid in the design of extrusion screws and the enhancement of overall melt quality in the polymer industry.