Brookfield DV-III Ultra Rheometer Manual de usuario descargar pdf (Pagina 53)

Brookeld Engineering Laboratories, Inc. Page 53 Manual No. M98-211-E0912

Plastic Viscosity (cP or mPa•s)

Yield Stress (Dynes/cm2 or N/m2)

Condence of Fit (%)

4. Power Law

The Power Law equation is τ = kD

where:

τ = Shear Stress

D = Yield Stress (stress at zero shear rate)

k = Plastic Viscosity

n = Shear Rate

The calculated parameters for this model are:

Flow Index (no units)

Consistency Index (cP or mPa•s)

Condence of Fit (%)

5. IPC Paste Analysis

This method is intended to calculate the Shear Sensitivity Factor and the 10 RPM Viscosity value

of pastes. A prime example of its use is in the solder paste industry, thus the name IPC (Institute

for Interconnecting and Packaging Electronic Circuits).

The Paste equation is:

η = kR

where:

η = Viscosity (cP)

k = Consistency Multiplier

R = Rotational Speed (RPM)

n = Shear Sensitivity Factor

The calculated parameters for this model are:

Shear Sensitivity Factor (no units)

10 RPM Viscosity (cP or mPa•s)

Condence of Fit (%)

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 132 133

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Brookfield DV-III Ultra Rheometer Manual de usuario Pagina 53