Abstract: Granular salt can cause a certain puncture effect on the packaging bag, which is one of the hidden dangers affecting the overall sealing performance of the package. This paper takes the anti-puncture test procedure of a plastic composite film for salt packaging as an example, introduces the test method for testing the puncture resistance of food packaging, and adopts the test principle and equipment XLW (EC) intelligent electric pull test machine parameters, applicable. The introduction of the scope and operation process provides a reference for enterprises to monitor the puncture resistance of packaging film.
Key words: puncture resistance, puncture resistance, puncture strength, intelligent electronic tensile testing machine, salt, leakage, plastic composite film, soft plastic packaging
1, meaning
Salt is an indispensable seasoning for daily diet. According to different sources of raw materials, salt can be divided into sea salt, well salt, lake salt, mineral salt, etc. No matter what type of salt is a crystalline solid with different particle size.
The common packaging materials for salt are plastic composite film, paper plastic film, aluminum-plated composite film, etc. In the process of transportation, storage and sale of salt packaging, when the stacking or falling occurs, the salt particles will produce certain punctures in the packaging bag. Force, if the puncture performance of the bag used is poor, the occurrence of more serious marks or pinholes under the puncture of salt will reduce the barrier performance and sealing performance of the package, causing an increase in the amount of gas permeating into the package. Packing broken bags, causing salt to absorb moisture, leaks, etc. Therefore, the packaging materials used for salt should have high puncture resistance.
Figure 1 Common packaging forms of salt
2, test samples
This time, a plastic composite film for a brand of salt packaging was used as a test sample to test its puncture resistance.
3. Test basis
This test is conducted in accordance with GB/T 10004-2008 "Packaging plastic composite film, bag dry composite, extrusion compounding" in the relevant provisions on puncture strength.
4, test equipment
This test uses the XLW (EC) intelligent electric power tensile testing machine to test the puncture strength of the sample. The equipment is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd.
Figure 2 XLW (EC) intelligent electronic tensile testing machine
4.1 Principle of the test
Puncture strength (force) refers to the maximum force generated during the penetration of a sample by a specified diameter puncture needle. During the test, the sample is clamped in the fixture, and the specimen is not moved during the puncture process. The upper collet of the device is installed with the puncture needle that meets the standard requirements. After the test is started, the puncture needle moves upward according to the set test speed. In the upper chuck of the device, a precision force sensor and a displacement sensor are arranged to accurately test the force value change and the displacement change (related to the deformation of the sample) generated during the puncture process, and display the force value of the test in real time. Displacement, thereby obtaining the puncture resistance of the sample.
4.2 Equipment parameters
The test specifications are 50 N, 500 N. The customer can choose according to the test requirements; the test accuracy is better than 0.5, which ensures the accuracy of the test data; supports the pull and press bidirectional test mode, and the pull and press directions are all seven. The test speed can be freely set by the user, 50 mm/min, 100 mm/min, 150 mm/min, 200 mm/min, 250 mm/min, 300 mm/min, 500 mm/min; integrated Eight independent test procedures, such as puncture, stretching, peeling, tearing, heat sealing, etc., provide users with a choice of various test items; use pneumatic sample clamping mode to prevent sample slippage and ensure accurate test data. Intelligent configuration of limit protection, overload protection and automatic return to ensure user's operation safety; support LystemTM laboratory data sharing system to achieve unified management of test data.
4.3 Scope of application
(1) This equipment is specialized in plastic film, composite materials, flexible packaging materials, plastic hoses, adhesives, adhesive tapes, stickers, medical patches, release papers, protective films, composite covers, metal Puncture, tensile, peeling, deformation, tearing, heat sealing, bonding, opening force, low-speed unwinding force, peeling force, etc. of foil, separator, back sheet material, non-woven fabric, rubber, paper, etc. Test. Such as salt tensile properties, heat seal strength, peel strength, right angle tear force.
(2) This equipment meets many national and international standards, such as GB/T 10004, GB 8808, GB/T 1040.1, GB/T 1040.2, GB/T 1040.3, GB/T 1040. 4, GB/T 1040.5, GB /T 4850, GB/T 12914, GB/T 17200, GB/T 16578.1, GB/T 7122, GB/T 2790, GB/T 2791, GB/T 2792, GB/T 17590, ISO 37, ASTM E4, ASTM D882, ASTM D1938, ASTM D3330, ASTM F88, ASTM F904, JIS P8113, QB/T 2358, QB/T 1130, and the like.
5, the test process
(1) Cut a sample of 5 specimens with a diameter of 100 mm from the surface of the salt-packed sample.
(2) Load one piece of the sample and clamp it in the equipment fixture to fix the clamp on the equipment.
Figure 3 Puncture test sample drawing
(3) Parameter setting parameter information such as sample name, sample thickness, and test speed.
(4) Test click test option, the test starts, the puncture needle moves upward according to the set test speed, and the sample is pierced. The device automatically records the change of the force value during the puncture process, and after the test is finished, the puncture force is displayed.
(5) Repeat the loading and start the test operation until all 5 samples have been tested.
6, the results
The puncture forces of the five samples tested in this test were 8.032 N, 8.116 N, 8.109 N, 8.076 N, and 8.127 N, respectively. The average puncture force of the salt bag samples was taken as the average of the test results of 8.092 N.
7. Conclusion
Puncture resistance is one of the basic properties that salt packaging should have. It is an important factor in determining whether the packaging bag is likely to cause a decrease in barrier properties or even break the bag under the puncture action of salt. In this paper, XLW (EC) intelligent electronic tensile testing machine is used to test the puncture force of a brand of plastic composite film for salt packaging. The test process is simple, the equipment is easy to operate, the test results are reproducible, stable, high precision, and can be very good. Reflects the puncture resistance of the sample. Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise specializing in R&D, production and testing services for packaging testing equipment. The existing equipment can test the barrier properties of packaging materials for oxygen, water vapor, nitrogen, carbon dioxide and other gases, tensile properties. , friction coefficient, tear performance, sealing performance, headspace analysis and other physical and mechanical properties and solvent retention, total migration and other health indicators, to understand the testing equipment and testing services, you can visit. The more you understand, the more you trust! Labthink is looking forward to enhancing technical communication and cooperation with enterprises and institutions in the industry!
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