EN_BRO_Melt_Flow_Indexer_Rev.I.pdf - 第18页

REDESIG N: mi3 & m i40 REDESIGN: mi 40 Applications mi2, mi3 and mi40 The position transducer in the instrument has a path resolution of 0.006 mm per pulse. F or optimal measuring results , this resolution can be sel…

More than just MFR and MVR

Add-On

Additional extension of our standardized Melt Flow Indexers

mi2, mi3 and mi40

With our modular Add-Ons, GÖTTFERT Melt Flow Indexers can

be ﬂexibly expanded. This way, a classical plastometer becomes

a versatile system for comprehensive material characterization.

Depending on the application, additional functions can be

integrated. This makes our instruments suitable not only for

standard testing, but also for demanding tasks in quality

assurance, development and process optimization.

MELT DENSITY VISCOSITY

DIE SWELL

MEASUREMENT

ELONGATION

When determining the Melt

Volume Rate (MVR) according

to Method B, the extruded

volume per unit of time is

measured via the piston

speed in cm³/10 min.

The melt density can be

measured directly and used

for converting between MVR

and MFR.

This Add-On requires a

laboratory balance as well as

the optional melt cutting unit.

With the “Viscosity Measu-

rement” Add-On, the mi40

becomes the mi40 visco.

This enables the plastometer

to perform viscosity measu-

rements in accordance with

the Capillary Rheometer

standard ISO 11443.

The intuitive handling of the

plastometer is combined with

the extended material

characterization capabilities

of a Capillary Rheometer. This

option allows viscosity to be

measured quickly and easily,

making it suitable as a QC

criterion, for example in

incoming goods inspection.

The Die Swell Measurement is

an Add-On from the series of

GÖTTFERT Capillary

Rheometers.

With the help of a laser

measuring head, which can

be adjusted in height, it is

possible to measure the

material-dependent swelling

of the extruded polymer

strand.

This Add-On is particularly

important for process optimi-

zation and quality control in

companies processing

elastomers (HDPE, PVC).

The D-MELT consists of a

GÖTTFERT Melt Flow Indexer

(Plastometer) mi40 and an

integrated HAUL-OFF

system.

The specially developed

D-MELT measuring method

makes it possible to

determine both the melt ﬂow

rate (MFR) and the melt elast-

icity (ME) with only one ﬁlling

of the test barrel.

The HAUL-OFF system, which

measures the melt elasticity,

is fed directly by the Melt

Flow Indexer, also called

plastometer.

REDESIGN:

mi3 & mi40

REDESIGN:

Applications

mi2, mi3 and mi40

The position transducer in the instrument has

a path resolution of 0.006 mm per pulse. For

optimal measuring results, this resolution can

be selected in three levels (high, normal and

low) depending on the MVR value.

For optimal determination of the piston path

resolution (mm per measuring point), this value

can also be set to be determined automatically.

This is particularly advantageous when

working with unknown materials.

More stable and precise than required by the standard

The current ISO 1133-2:2011 standard requires a tempe-

rature accuracy of ±0.3 °C up to 70 mm before the die.

Our instruments exceed these requirements signiﬁcantly, as

shown in the diagrams. This also applies when measure-

ments are performed according to Part 1 of the standard.

Automatic resolution determination

Multi-load measurement

Temperature proﬁ le

With relaxation phase for higher precision

In conventional multi-weight measurements, the

relaxation phase is missing, which results in higher scatter.

The multi-load function of the mi40 (up to 8 weights)

gives the material targeted time to relax, reduces

pre-shear eﬀects and thus ensures measurement results

that are much closer to single-weight measurements.

Last 1

Last 2

Last 3

Last 4

MFR in g/10min

Last 1

Last 2

Last 3

Last 4

Ruhezone

0 10 20 30 40 MP

Material measurement

Max. limit value

Min. limit value

0 10 20 30 40 50 60 70 80 90 100

Temperature [°C]

Position before the die [mm]

188

188,5

189

189,5

190

190,5

191

191,5

192

What sounds simple is the result of consistent

further development.

Through targeted optimizations in design,

manufacturing, and quality control, our Melt Flow

Indexers achieve double the measurement

accuracy and an even higher level of instrument

repeatability.

The results are based on internal QC tests that

every instrument undergoes before delivery. As a

reference, a standard PE with an MFR of 7.5 was

used. Around 40 test protocols per model series

were evaluated.

While the predecessor models MP-D and MPX

already achieved excellent dispersion values below

1 % (Ø 0.83 %), the current generation of Melt

Flow Indexers mi2, mi3, and mi40 now reach

maximum variances of only 0.4 %.

For many polymer melts, the type of ﬁlling and compaction

has a decisive inﬂuence on measurement accuracy and

reproducibility.

Our instruments oﬀer various options for material

compaction throughout the entire melting process. Either a

ﬁxed position in the test barrel can be approached, or a

deﬁned time/force window can be set.

With the mi3, weight selection is performed

manually, while with the mi40 it can be conveniently

controlled via software.

Compaction, measurement, extrusion – individually controllable

Variation halved – Accuracy doubled

Pre-compaction

Automatic with selectable pre-compaction weight to a freely

deﬁnable position

or adjustable time/force window.

Post-compaction

With test weight to a freely deﬁnable position

or 55 mm

before the capillary

(5 mm before the ISO 1133

measuring section).

Measurement

Automatic, including the selection of up

to eight freely combinable weight levels.

After the measurement

Automatic extrusion of residual material

with adjustable maximum weight.

Number of measurements

Predecessor model: MP-D, MPX

Coecient of variation: 0,83 %

MFR

Model: MI-3 and MI-4

Coecient of variation: 0,4 %

Number of measurements

Model: mi40

Coecient of variation: 0,25 %

MFR