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
