Influence of Fill Imbalance on Pressure Drop in Injection Molding

Advances in Manufacturing Engineering and Materials - Lecture Notes in Mechanical Engineering ◽

10.1007/978-3-319-99353-9_58 ◽

2018 ◽

pp. 548-556 ◽

Cited By ~ 1

Author(s):

Przemyslaw Poszwa ◽

Pawel Brzek ◽

Pawel Muszynski ◽

Marek Szostak

Keyword(s):

Pressure Drop ◽

Injection Molding

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Effect of the melt compressibility and the pressure drop rate on the cell-nucleation behavior in foam injection molding with mold opening

European Polymer Journal ◽

10.1016/j.eurpolymj.2017.05.003 ◽

2017 ◽

Vol 92 ◽

pp. 314-325 ◽

Cited By ~ 17

Author(s):

Vahid Shaayegan ◽

Chongda Wang ◽

Franco Costa ◽

Sejin Han ◽

Chul B. Park

Keyword(s):

Pressure Drop ◽

Injection Molding ◽

Nucleation Behavior ◽

Cell Nucleation ◽

Foam Injection Molding ◽

Melt Compressibility ◽

Drop Rate

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The Effect of Oil and Black on the Injection Molding of EPDM Compounds. I.

Rubber Chemistry and Technology ◽

10.5254/1.3539301 ◽

1969 ◽

Vol 42 (5) ◽

pp. 1321-1335

Author(s):

William G. DePierri ◽

J. R. Hopper

Keyword(s):

Pressure Drop ◽

Injection Molding ◽

Flow Behavior ◽

Injection Pressure ◽

Flow Properties ◽

Pressure Drops ◽

Factors Affecting ◽

Shear Rates ◽

Divergent Flow ◽

High Shear Rates

Abstract Factors affecting the flow properties of EPDM compounds have been studied and the findings of the study applied to the injection molding of these compounds. The level of oil and of black were found to change the flow properties of EPDM compounds. Higher levels of oil decreased the compound viscosity while higher levels of black increased the compound viscosity. The viscosity of the oil influenced compound viscosities. Compounds made with the more viscous (at 210° F) oil had slightly higher viscosities. However, changing from an aromatic to a naphthenic oil of similar viscosity had little effect on the compound viscosity. Compounds made from two different polymers of similar Mooney viscosity were found to have widely divergent flow behavior at high shear rates. Injection molding of EPDM compounds was studied with a molding assembly which had a capillary rheometer as barrel and plunger. Injection pressure data from the molding experiments was found to parallel closely the rheological data. An analysis of the pressure drops in passing through different parts of the mold assembly was made. The total calculated pressure drop agreed closely with the measured pressure drop. The viscous generation of heat was found to be proportional to pressure drop, and an equation is presented which relates the temperature increase to the pressure drop.

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Rapid Numerical Estimation of Pressure Drop in Hot Runner System

Micromachines ◽

10.3390/mi12020207 ◽

2021 ◽

Vol 12 (2) ◽

pp. 207

Author(s):

Jae Sung Jung ◽

Sun Kyoung Kim

Keyword(s):

Pressure Drop ◽

Injection Molding ◽

Steady Flow ◽

Design Process ◽

Newtonian Fluid ◽

Numerical Estimation ◽

Generalized Newtonian Fluid ◽

Computer Tool ◽

Pressure Drops ◽

Runner Design

To determine dimensions in the hot runner systems, given a material, it is necessary to predict the pressure drop according to them. Although modern injection molding simulators are able to evaluate such pressure drops, they are expensive and demanding to be employed as a design utility. This work develops a computer tool that can calculate a pressure drop from the sprue to the gate assuming a steady flow of a generalized Newtonian fluid. For a four drop hot runner system, the accuracy has been verified by comparing the obtained results with those by a commercial simulator. This paper presents how to utilize the proposed method in the hot runner design process.

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