Stress-strain curves for Unfilled polymers

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Stress-strain curves for Unfilled polymers
below shows a typical stress-strain curve for short-term loading of a typical unfilled thermoplastic material. Figure 6 depicts the same curve as shown in Figure 5, except it is stretched horizontally to show the details within the elastic region. Several important material properties, such as Young’s modulus, proportional limit, elastic limit, yield ......Read More

Stress-strain behavior

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Stress-strain behavior
Part strength The stress-strain behavior of a material determines the material contribution to part strength (or stiffness), the relationship between load and deflection in a plastic part. Other factors that affect part strength include part geometry, loading, constraint conditions on the part, and the residual stresses and orientations that result from the......Read More

Material properties for part design

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Material properties for part design
Plastics are sensitive to operating conditions The plastics molding processes allow parts designers more freedom than working with metals because plastics materials are so versatile. Unlike metals, however, the mechanical properties of plastics are very sensitive to the type, rate, duration, and frequency of loading, the change in operating temperature, and......Read More

MOLD DESIGN

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MOLD DESIGN
Key to the injection-molding process,the injection mold forms the molten plastic into the desired shape, provides the surface texture, and determines the dimensions of the finished molded article. In facilitating mold-cavity filling and cooling, the mold also influences the molding cycle and efficiency as well as the internal stress levels and end-use perfo......Read More

MFA and MFV

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MFA and MFV
Definition Here we present two simple yet important design and process parameters: melt-front velocity (MFV) and melt-front area (MFA). As its name suggests, melt-front velocity is the melt-front advancement speed. Melt-front area is defined as the cross-sectional area of the advancing melt front: either the length of the melt front multiplied by the thickn......Read More

Filling pattern

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Filling pattern
What is the filling pattern? The filling pattern is the transient progression of the melt front within the delivery system and mold cavities. It plays an important role in determining the quality of the part. Melt front velocity influences filling pattern Constant MFV The ideal filling pattern has melt reaching every extremity of the cavity simultaneously, ......Read More

Factors that influence injection pressure

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Factors that influence injection pressure
requirements The following diagrams illustrate the design and processing factors that influence injection pressure. Read More

Equations

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Equations
Based on a simplification of classic fluid mechanics theory, the injection pressure required to fill the delivery system (the sprue, runner, and gate) and cavities can be correlated with several relevant material, design, and processing parameters. In the following equations, P is the injection pressure and n is a material constant (the power-law coefficien......Read More

Injection pressure

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Injection pressure
Pressure drives the melt Pressure is the driving force that overcomes the resistance of polymer melt (see Pressure-driven flow), pushing the polymer to fill and pack the mold cavity. If you place a number of pressure sensors along the flow path of the polymer melt, the pressure distribution in the polymer melt can be obtained, as schematically illustrated ......Read More

Thin-wall Mould

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Thin-wall Mould
Thin wall Mould, produced by Zhilian Mould are widely used in household accessories, daily commodity, disposable usage, and industrial area. The thinnest wall we can control is 0.35mm, can be used in precision mould series, disposable usage, this makes us to be one of the best thin wall Mould manufacturers. Our thin wall Mould can be set up on most high spe......Read More