Technical value analyzed through the viscosity curve
as a function of temperature (lowest slope) 100 points 50% -
In what follows we will observe how this shape of the viscosity curve
will change when modifying the PVC particle size distribution, the PVC particle content, or when substituting PVC particles by calcium carbonate particles.
He elaborates, "In injection molding, you can vary injection speed and monitor pressure to generate an in-mold viscosity curve
Figure 1 shows the type of viscosity curve
that is recorded when measurements are made at several different rotational speeds.
Another standard is ASTM D5133, based on the Scanning Brookfield Technique (SBT) that can provide a viscosity curve
from -5 to -40[degrees]C, and calculates the Gelation Index of the sample.
It is always good to run a salt viscosity curve
for each formula, which can be done by adding the salt to the formula in increments of 0.
With this data and with some correction factors (Weissenberg/Rabinowitsch, Schummer, Dodge/ Metzner or Reiner/Philipoff) a viscosity curve
across a range of shear stresses can be measured and translated into real results.
Section 1: To determine and plot a viscosity curve
of a two-part epoxy adhesive.
This, says Milacron, allows operators to compare new or regrind material with a previously tested batch and determine parameter changes needed to obtain the same viscosity curve
and flow characteristics.
So the actual minimum start-up temperature is where the viscosity curve
crosses the 300 cPs line.
Let's start with the viscosity curve
, as shown in the accompanying graph.
The melt flow test is carried out according to ISO 1133 and ASTM D1238, and measures one point on the viscosity curve
under standard conditions.