The large-scale rubber and plastic specific gravity tester usually uses Archimedes buoyancy method (drainage method) as the core detection principle, combined with high-precision weighing and temperature compensation technology, to achieve rapid and accurate measurement of the density of materials such as rubber and plastic. The following is a detailed analysis of its performance testing principle:
1、 Principle of Archimedes' buoyancy method
advantage
Non destructive: No need to cut the sample, preserving material integrity.
High precision: Combined with high-precision weighing sensors (with an accuracy of up to 0.001g/cm ³), it can detect small density differences.
Quick measurement: With 2-3 steps, a single measurement can be completed within 5 seconds, making it suitable for rapid inspection on production lines.
2、 Key technology implementation
High precision weighing system
Large scale program design: supports weighing range of 0.005g~600g, covering multiple sample types such as rubber, plastic particles, block materials, and films.
Resolution: up to 0.001g, ensuring accurate capture of small mass changes.
Stability: Designed with windproof and dust-proof covers to reduce the impact of environmental interference (such as airflow and vibration) on measurement results.
Temperature compensation function
Liquid density correction: The liquid density changes significantly with temperature (for example, the density of water is 1g/cm ³ at 4 ℃ and drops to 0.998g/cm ³ at 20 ℃). The tester is equipped with a built-in temperature sensor, which automatically corrects the liquid density and eliminates temperature errors.
Standard solution support: Supports media such as distilled water, alcohol, silicone oil, etc., to meet the testing needs of different materials.
Design of large water tank and anti buoyancy error
Sink size: Adopting D100 × W70 × H25mm large sink, it can accommodate large block samples (such as tires and pipes) to avoid edge effects.
Lightweight suspension line: Reduce the impact of suspension line buoyancy on measurement results and ensure the accuracy of volume calculation.
3、 Performance optimization and feature expansion
Automation and Intelligence
One click operation: Automatically complete weighing, data recording, and density calculation, reducing human error.
Data storage and output: Supports storage of more than 10 sets of data, and can be connected to a PC or printer through an RS-232 interface to achieve data traceability and report generation.
Alarm function: overload alarm, buzzer prompt, ensuring safe operation of equipment.
Multi-functional integration
Wear test: Some models (such as QL-300AW/QL-600AW) integrate DIN and AKRON wear test methods, which can simultaneously measure the wear volume and wear index of materials.
Foaming rate measurement: for polyurethane, EPS and other foam plastics, the foaming ratio and mass change rate can be calculated to evaluate the material performance.
Oil seal quality inspection: Measure the change rate and volume expansion rate of vulcanized rubber oil seals to ensure the reliability of the seals.
4、 Application scenarios and compliance with standards
quality control
Raw material inspection: Regularly check the density of rubber and plastic particles to ensure batch consistency and avoid product defects caused by density fluctuations (such as uneven hardness and decreased wear resistance).
Finished product testing: Monitor the density of finished products such as tires and seals to verify the stability of the production process.
Material research and development
Formula optimization: By measuring the density of different formula materials, evaluating the influence of fillers and foaming agents on material properties, and optimizing formula design.
Performance prediction: Density is closely related to physical properties such as hardness, tensile strength, and elongation, providing data support for material performance prediction.
Standard compliance
Comply with international standards to ensure the credibility and industry recognition of measurement results.