Differentiation between various test machines

Things to note when purchasing tensile machine:
1. First, consider the need to test the tension range of the material. The different tension range determines the different sensors used, which also determines the structure of the tension machine, but this item has little impact on the price (except for the gantry). For general flexible packaging manufacturers, the tension range of 100 Newtons is enough. Therefore, it is also decided to use a single-arm type.
The corresponding structure to the single-arm type is a gate-type structure, which adapts to relatively large tension, such as one ton or more. Therefore, flexible packaging manufacturers are basically not available.
2. Issues of test itinerary.
According to the performance and requirements of the flexible packaging film, the stroke is 600-800mm. If the material elongation exceeds 1000%, the stroke can be 1000 or 1200mm.
3. Standard configuration issues.
Three basic configurations of intelligence: host, microcomputer, and printer. If the microcomputer has strong functions, you can print directly. In addition, it can also be equipped with a normal computer. With a computer, complex data analysis can be carried out, such as data editing, local amplification, and the report format can be adjusted, and statistical analysis of group styles can be carried out.
If you use a computer, the manufacturer should add the corresponding control system.
4. Output result.
The output results of the test results can be set arbitrarily: force value, elongation, tensile strength, constant elongation, fixed elongation value, yield strength, elastic modulus, and test force. This can be said to be a comprehensive result of the output when the microcomputer is operated. Products from some foreign manufacturers can generally output these 8 items. Some domestic manufacturers can output 5-6 items, while some manufacturers can only output three items: force value, average value and small value.
5. On the experimental projects that can be done.
Flexible packaging requires that one tension machine is used for multiple purposes, that is, on the basis of equipped with different fixtures, tensile, compression, bending, tearing, shear, 180-degree peeling, and 90-degree peeling tests can be performed.
In addition to the above items, some tensile machines on the market can also test the friction coefficient because of their high sensor accuracy (some reach one in 250,000).
6. Main configuration of product machinery:
The transmission has lead screw transmission and rack transmission. The former is expensive, used for high accuracy and has high repeatability for tests; the latter is cheap, used for low accuracy and has low repeatability for tests.
The lead screw has a decisive effect on the measurement of tension accuracy. Generally, there are ball screws, trapezoidal screws, and general screws. Among them, the accuracy of the ball screw, but its performance can only be achieved by operating the computer servo system, and the whole set is also relatively expensive. The use of general lead screws and trapezoidal lead screws can achieve the accuracy required for flexible packaging, that is, 0.5-1% accuracy.
Drives, with geared and chain drives, the former is expensive for high precision; the latter is cheap for low precision.
The main cost of sensors lies in their lifespan. Photoelectric induction is the relatively advanced technology, which is generally available for more than 100,000 times. Imported and some domestic joint venture manufacturers can achieve better technology. Shanghai Trustda Instrument Co., Ltd.
7. Test speed.
Some of the market equipment are 10~500 mm/min, and some are 0.001~500 mm/min. The former generally uses ordinary speed control systems, which are relatively low in cost and rough affects accuracy; the latter uses servo systems, which are expensive and have high accuracy. For flexible packaging companies, if you choose a servo system, the speed control range of 1~500 mm/min is enough, which does not affect the accuracy, and the price is within a reasonable range.
8. Measurement accuracy.
Accuracy issues, including force measurement accuracy, speed accuracy, deformation accuracy, and displacement accuracy. These accuracy values ​​can reach plus or minus 0.5. But for ordinary manufacturers, achieving 1% accuracy is enough. In addition, the force resolution can almost reach tens of tens of thousands of times

Tension machine is also called tensile testing machine. Tension machine is a mechanical after-force test for mechanical properties such as tensile, compression, bending, shearing, and peeling of materials. It is suitable for various physical and mechanical properties testing of plastic sheets, pipes, special profiles, plastic films, rubber, wires, cables, waterproof rolls, metal wires and other materials. Its use industry scope covers: scientific research institutes, commodity inspection and arbitration institutions, colleges and universities, as well as rubber, tires, plastics, wires and cables, shoemaking, leather, textile, packaging, building materials, petrochemicals, aviation and other industries. It is an indispensable testing equipment such as material development, physical properties test, teaching research, quality control, feed inspection, and random inspection of production lines. Tension machine fixtures are an important part of the instrument. Different materials require different fixtures, which is also an important factor in whether the test can be carried out smoothly and the accuracy of the test results.