The purchase of the electronic tensile testing machine (in the overall construction plan of the flexible packaging laboratory) should be based on the needs of the film used, considering the performance and specifications, and comparing from the following aspects:
1. First, the tensile range of the material to be tested should be considered. The difference in the tension range determines the difference in the sensors used, which also determines the structure of the tension machine, but this item 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 was decided to use the single-arm type. The structure corresponding to the single-arm type is the portal structure, which is suitable for relatively large pulling forces, such as one ton or more. Therefore, flexible packaging manufacturers basically do not need it.
Second, the problem of test schedule. According to the performance and requirements of the flexible packaging film, the stroke can be 600-800mm. If the material elongation exceeds 1000%, the stroke of 1000 or 1200mm can be used.
Third, the standard configuration problem. Three basic intelligent configurations: host computer, microcomputer, and printer. If the microcomputer has strong functions, you can print directly. It can also be equipped with ordinary computers. With a computer, you can perform complex data analysis, such as data editing, local zoom, adjustable report format, and statistical analysis in groups. If equipped with a computer, the manufacturer should add the corresponding control system.
4. Output results. 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, maximum test force 8 items. This can be said to be the most comprehensive result output when the microcomputer is operated. The products of some foreign manufacturers 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.
5. On the experimental projects that can be done. Flexible packaging requires a multi-purpose tensile machine, that is, on the basis of different fixtures, it can be used for tensile, compression, bending, tearing, shearing, 180 degree peeling, and 90 degree peeling tests. There are some high-end tension machines on the market. In addition to the above items, due to their high sensor accuracy (some reaching three hundred thousandths), they can also test the coefficient of friction. Such as Japan Shimadzu, Beijing Landmec and other companies.
Sixth, the main configuration of product machinery. Transmission, there are 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 plays a decisive role in the measurement of tension accuracy. The general ones are ball screw, trapezoidal screw and general screw. Among them, the accuracy of the ball screw is the highest, but its performance can only be achieved by the operation of the computer servo system, and the whole set is relatively expensive. The precision required for flexible packaging can be achieved by using general screws and trapezoidal screws, that is, 0.5-1% accuracy. Transmission, there are gear transmission and chain transmission, the former is expensive and used for high precision; the latter is cheap and used for low precision. The main cost of the sensor lies in the life span. Photoelectric sensing is one of the more advanced technologies. It is generally available for more than 100,000 times. It can be achieved by imported and domestic joint venture manufacturers.
7. Test speed. Some of the equipment on the market is 10 ~ 500 mm / min, and some is 0.01 ~ 500 mm / min. The former generally uses a common speed control system, which has low cost and roughness affects accuracy; For flexible packaging companies, the servo system is used, and the speed range of 1 ~ 500mm / min is enough, so that it does not affect the accuracy, and the price is within a reasonable range.
8. Measurement accuracy. Accuracy issues include force measurement accuracy, speed accuracy, deformation accuracy, and displacement accuracy. These precision values ​​can be up to plus or minus 0.5. But for general manufacturers, 1% accuracy is sufficient. In addition, the resolution of the force value can almost reach 1 / 100,000. The above basic configuration is about 30,000 yuan. If the friction coefficient is tested, the price is about 40,000 yuan.
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