Selection Method of Tensile Testing Machine

Haida International Equipment Co., Ltd. specializes in the production of universal testing machines for tensile testing. Several important aspects needing attention in the purchase of universal testing machines for tensile testing are summarized.

Capacity, test stroke, and configuration

Different tension ranges and different force sensors will lead to different structures, which will directly affect the cost of the instrument. For general flexible packaging manufacturers, the tension range of 300 Newton is enough.

According to the performance and requirements of flexible packaging film to be tested, the stroke can be 600-800mm;

Intelligent configuration of three options: host, computer, and printer. The microcomputer function can also print electronic tickets directly. In addition, ordinary computers can also be equipped. If equipped with computers, manufacturers need to configure professional test software. With computers, complex data analysis can be carried out, such as generating test reports, data editing, local amplification, adjustable report form, and group-style statistical analysis.

Test items

Flexible packaging requires a multi-purpose tensile machine, that is, based on different fixtures, it can be used for stretching, compression, bending, tearing, shearing, 180 degrees peeling, 90-degree peeling test, three-point bending resistance, four-point bending resistance, etc.

Test speed

Some commercially available desktop tensile test machines are 30 - 400 mm / min and some are 0.01 - 500 mm / min. the former generally uses an ordinary speed regulation system, which has a low cost and rough influence on accuracy. The latter uses a servo system, which is expensive and high precision.

For flexible packaging enterprises, the servo system is selected, and the speed regulation range of 0.01 - 500mm / min is ideal, which meets the accuracy requirements and the price is within a reasonable range.

Note: the speed regulation system with a price of about 10000 yuan is the speed regulation system because the market price of the servo motor is about 4500 yuan/piece.

Measurement accuracy

Accuracy problems, including force measurement accuracy, velocity accuracy, deformation accuracy, and displacement accuracy. The highest accuracy of the Kington universal testing machine for tensile testing can reach plus or minus 0.3%. But for general manufacturers, 1% accuracy is enough. In addition, the force resolution of the Kington universal testing machine for tensile testing can reach 1 / 200000.

Transmission

There are screw drives and rack drives. The former is expensive, used for high precision and high test repeatability; The latter is cheap, used for low precision and low test repeatability. The desktop tensile test machine for flexible packaging is frequently used and requires high precision, so it should be driven by a lead screw. The screw rod plays a decisive role in the measurement of tension accuracy. Generally, there are ball screws, trapezoidal screws, and general screws.

Among them, the accuracy of the ball screw is the highest, but its performance can only be played by the operation of the computer servo system, and the whole set of prices is also relatively expensive. In addition, the ball screw can be divided into domestic and imported, both of which have great differences in price and quality.

Sensor

The main cost lies in the service life. The sensor sensing technology can be used more than 100000 times, which can be achieved by imported and some domestic joint venture manufacturers. In addition, the sensor is also an important component that affects the test results. Relatively speaking, the accuracy of domestic sensors is not high and the quality is not as good as that of imported sensors. Therefore, the manufacturer should be asked when purchasing.

Machine quality

The machine platform of the desktop tensile test machine is like the body of an automobile, which should meet the relevant requirements of the above six points.

If you want to buy a tensile test machine, we hope to be your first choice.