Ueshima Viscoelasticity Analyzer (DMA)

VR-7130 Automatic DMA was designed to eliminate possible causes of measurement errors and variability by adopting the full automatic system and the unique temperature sensor. In combination with THERMO JETTER, it can measure viscoelasticity down to -90°C without using liquid nitrogen.

A high-polymer material is a viscoelastic material, unlike elastic materials such as metals. In the case of elastic body, strain (response) comes up simultaneously to the given force (input). On the contrary, in case of a high polymer material, time lag will occur between input and response. These relations are different by the sample components and also dependent on temperature, velocity and strain. High polymer materials are used for various uses and regions by using such differences.

As these properties are mainly treated as material properties, response to very minute input (force or strain) will be mainly measured. (Strain is measured to force or force to strain.) The VR-7130 has minimized possibility of human errors and realized excellent precision in viscoelasticity measurement of high-polymer materials.

Applications

Simulation of product property by test pieces

Tire: Abrasion/Friction/Rolling Resistance/Evolution of heat etc.
Car: Ride/Vibration-proof performance/noise
Other Vibration control and/or suppression/Sealing ability………

Molecular structure/degradation level etc.

Features

Possible to load 60 max. samples automatically (Option：100 pieces）
Sample chucking, measurement and discharge are automated, and there is no human error.
Stepwise temperature control and rubber-covered thermo-couple enables more precise temperature measurement.
Thermo-couple covered by the same thick rubber as sample and step temperature-increasing system are employed and there becomes no difference between the sample temperature and the temperature sensor.
Piezoelectric load cell realizes more precise load measurement.
Rigidity(deflection) of the each component effects to test result as minute strain such as several μm and several dozen μm is measured at viscoelasticity measurement. High rigidity piezoelectric load cell is selected in this testing machine.
Effect by the chassis resonance is completely excluded, in spite of the compact body
High precision measurement is possible, as there is no resonance point in the testing region (0.1 – 200Hz).
Thermo Jetter cooling system enables measurement at low temperature down to -90°C without using liquid nitrogen
Direct calculation of phase enables improvement of measurement accuracy
Increased maximum frequency and load
Frequency: 0.1 to 200Hz (0.1 to 100Hz)
Maximum load: 200N (90N)

Measurement Modes

Fixed point measurement
Temperature dispersion
Frequency Dispersion
Strain dispersion

Measurement Items

Absolute complex modulus［E✽］：10−1〜104MPa
Storage modulus E’：10−1〜104MPa
Loss Modulus E’’：10−1〜104MPa
Tangent delta tanδ：0.001〜3.000

Software

Database software

Management of testing conditions
Management of testing results
Management of equipment conditions
Data backup

Measurement Software

Test Condition Input Screen

Choice of testing mode：Fixed point measurement, Temperature dispersion, Frequency dispersion, Strain dispersion etc.
Setup of testing conditions：Testing temperature, frequency and strain
Sample conditions：Thickness, Breadth

Testing Screen

Real time indications among testing（Graph and value display）
Present conditions are available by status display. Error handling is easy also
Reporting output and text conversion（CSV form） after testing are possible

Specifications

Name	Automatic Viscoelasticity Analyzer
Model	VR-7130
Sample dimensions	Rectangular shape　40(L) x 4(W) x 2(t) mm
Testing method	Vertical tensile method
Sample convey system	Automatic: 60 samples max. （Option: 100 samples max.）
Distance between chucks	20mm （Option: 10mm）
Load detection	（1）Load detector: Piezoelectric type load cell （2）Maximum load: 90N or 200N （3）Resolution: 1% F.S.
Displacement detection	（1）Displacement sensor: Optical fiber, non-contact type small displacement sensor （2）Maximum displacement: 2,000μm （3）Resolution: 0.3μm
Vibrator	（1）Vibration system: Electric vibrator (Lower chuck drive) （2）Vibration waveform: Sinusoidal wave （3）Vibration frequency: 0.1 to 200Hz　continuously variable （4）Vibration amplitude (strain): ±0.1 to ±2.5% (40 to 1,000μm　p-p) continuously variable (±0.2 to ±5% in case of 10-mm chuck distance)
Initial tension	（1）Mechanism: Lower side chuck tension by the vibrator （2）Method: Constant strain method, constant load method (calculated to strain) （3）Tension: 0μm to 2,000μm
Thermostatic chamber	Framework: Opens and closes automatically
Testing temperature range	-90 to 200℃(combined with Thermo Jetter) -100 to 200℃(used together with a liquid nitrogen cooling system)
Safety device	（1）Emergency stop switch （2）Overheat limiter （3）Pneumatic limiter （4）Ground-fault circuit breaker
Connection for control	（1）Main unit control: USB （2）Temperature control: RS－232C (D－SUB 9pin)
Utilities	（1）Main unit: Power source　AC100V 1-phase 1kVA Dry air　0.4MPa （2）Cold air generator：Power source　AC200V　3-phase 4kVA Dry air　0.5MPa　Flow rate 100L/min
Usage environment	（1）Temperature : 5 to 40℃ （2）Humidity : 35 to 80%RH
Dimensions	Main unit and the rack: approx. 520 (W) x 1300 (H) x 600 (D) mm Thermo Jetter (cooling air generator): approx. 580 (W) x 1110 (H) x 800 (D) mm
Accessories	Load calibration tool, tool set and connection cables

Option

Master curve software
Temperature/strain dispersion, Temperature/frequency dispersion
Sample cutting blade, the exchangeable blade type

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