Tensile testing machine is a mechanical forcing test machine for mechanical properties of static load, tensile, compression, bending, shearing, peeling, etc. The tensile properties of plastics and rubber are the most important in its mechanical properties. One of the most basic properties, which largely determines the use of this kind of plastic and rubber. The tensile properties can be tested by a tensile test.
Tensile testing machine maintenance problem:
First, the quality problem. The difference in the range of tension determines the difference between the sensors used and the structure of the tension machine, but this has little effect on the price (except for the door type). For general flexible packaging manufacturers, a pull range of 100 Newtons is sufficient. Therefore, it is also decided to use a single arm type. Corresponding to the one-arm type is a gantry structure, which is adapted to a relatively large pulling force, such as one ton or more. Therefore, soft packaging manufacturers basically do not need.
Second, the problem of the test itinerary. According to the performance and requirements of the flexible packaging film, the stroke can be 600-800mm. For materials with an elongation of more than 1000%, a stroke of 1000 or 1200 mm can be used.
Third, the standard configuration problem. Three basic configurations of intelligent: host, microcomputer, and printer. If the microcomputer is powerful, it can be printed directly. It can also be equipped with a regular computer. With a computer, you can perform complex data analysis, such as data editing, partial magnification, adjustable report formats, and statistical analysis of groups. If equipped with a computer, the manufacturer should give the corresponding control system.
Fourth, the output problem. The test result output can be arbitrarily set: maximum force value, elongation, tensile strength, constant force elongation, constant elongation force value, yield strength, elastic modulus, and maximum test force. This can be said to be the most comprehensive result of the output when the microcomputer is operated. Some manufacturers in foreign countries can generally output these 8 items. Some domestic manufacturers can output 5-6 items, and some manufacturers can only output the maximum force value, average value and minimum value.
Fifth, experimental problems. Flexible packaging requires a multi-purpose tensile machine, that is, on the basis of different fixtures, it can be used for stretching, compression, bending, tearing, shearing, 180 degree peeling, and 90 degree peeling test. In addition to the above items, some high-end tensile machines on the market can also test the friction coefficient because of their high precision (some of them reach 250,000).
Sixth, the main configuration problems: transmission, with screw drive and rack drive, the former is expensive, used for high precision, high test repeatability; the latter is cheap, used for low precision, low test repeatability. The lead screw has a decisive effect on the measurement of the pull force accuracy. Generally there are ball screws, trapezoidal screws, and general screw. Among them, the ball screw has the highest accuracy, but its performance depends on the operation of the computer servo system, and the whole price is relatively expensive. The precision required for flexible packaging, that is, 0.5-1% accuracy, can be achieved with a general lead screw and a lead screw. Transmission, geared and chain drive, the former is expensive for high precision; the latter is cheap for low precision. The main cost of the sensor lies in the life span. Photoelectric induction is one of the more advanced technologies, generally more than 100,000 times.
Seven, the test speed problem. Some of the market equipments are in the range of 10~500 mm/min, and some are in the range of 0.001~500 mm/min. The former generally uses the ordinary speed control system, the cost is lower, the roughness affects the accuracy; the latter uses the servo system, which is expensive and has high precision. For flexible packaging enterprises, the servo system is selected, and the speed range of 1~500mm/min is sufficient, so that the accuracy is not affected and the price is within a reasonable range.
Eight, measurement accuracy problems. Accuracy issues, including force measurement accuracy, speed accuracy, deformation accuracy, and displacement accuracy. These precision values ​​can be up to plus or minus 0.5. But for the average manufacturer, achieving 1% accuracy is enough. In addition, the force value resolution can almost reach 100,000 points of tension machine maintenance.
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