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Method for detecting heat seal strength of plastic composite film packaging of quick-frozen products
Abstract: Quick-frozen products are quick-frozen foods that are processed by rapid low-temperature processing. The probability of breakage of the package bag at low temperature is high. In this paper, Labthink XLW-PC intelligent electronic tensile testing machine is used to test the heat sealing performance of quick frozen products. The basic process of the test, the applicable scope of the test equipment and the test process are introduced to help the food enterprises effectively monitor the heat sealing parameters of the products.
Key words: quick-frozen products, plastic composite film packaging, seal breakage, heat seal strength, seal sealing performance, intelligent electronic tensile testing machine
1, meaning
Heat seal strength, also known as heat seal strength or seal strength, is an indicator for assessing the seal strength of heat-sealed parts of food packaging. If the heat sealing effect is obviously stronger than the composite fastness, it is easy to appear that the heat sealing portion is not easy to be unsealed. If the heat seal strength is insufficient, the finished package may have problems such as opening, leaking, and breaking the bag.
Quick-frozen products include quick-frozen buns, quick-frozen dumplings, quick-frozen dumplings, quick-frozen dumplings, flower rolls, spring rolls, etc., which are generally packaged in plastic composite film. If the sealing strength of quick-frozen products is insufficient, the problem of air leakage or bag breakage may occur, resulting in poor taste of quick-frozen products. And even breed bacteria, the health of consumers in crisis. Therefore, the food enterprise quick-frozen product packaging should have reasonable heat-sealing strength to ensure the sealing performance of the product packaging seal.
Figure 1 Quick-frozen product plastic composite film packaging
2, the implementation of standards
The domestic testing standards for the heat-sealing strength of plastic film packaging bags mainly refer to QB/T 2358-1998 "Test method for heat-sealing strength of plastic film packaging bags".
3, test samples
A quick-frozen composite film package provided by a food factory.
4, test equipment
Jinan Languang Electromechanical Technology Co., Ltd. independently developed and designed the XLW-PC intelligent electronic tensile testing machine.
Figure 2 XLW-PC intelligent electronic tensile testing machine
4.1 Principle of the test
The sample is clamped between the two chucks of the clamp, and the two chucks are moved relative to each other. The force value sensor and the built-in displacement sensor on the movable chuck are used to collect the force value change and displacement during the test. The change is made to calculate the heat seal strength, tensile strength, deformation rate, peel strength and the like of the sample.
4.2 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 Heat sealing, stretching, peeling, deformation, tearing, bonding, puncture force, opening force, low speed unwinding force, peeling force, etc. of foil, separator, back sheet material, non-woven fabric, rubber, paper, etc. The test, such as the tearing force of the oral liquid cover, the puncture/pull force, the puncture force of the infusion bag cover, the puncture/pull force of the soft rubber bottle stopper.
(2) This equipment meets a number of national and international standards, such as QB/T 2358, ISO 37, 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/T17200, GB/T 16578.1, GB/T 7122, GB/T 2790, GB/T 2791, GB/T 2792, GB/T 17590, ASTM E4, ASTM D882, ASTM D1938, ASTM D3330, ASTM F88, ASTM F904, JIS P8113, QB/T 1130, and the like.
4.3 Equipment parameters
The test specifications of the equipment are 50 N, 500 N, and the customer can choose according to the needs of the test.
The test accuracy of the device is better than 0.5, which ensures the accuracy of the test data.
The device supports the pull and press bidirectional test mode. There are seven test speeds for the user to set freely in the pull and press directions, respectively 50 mm/min, 100 mm/min, 150 mm/min, 200 mm/min, 250. Mm/min, 300 mm/min, 500 mm/min.
The device integrates eight independent test procedures, such as heat sealing, stretching, peeling, tearing, and puncture resistance, to provide users with a variety of test items.
This equipment adopts the pneumatic sample clamping mode to prevent the sample from slipping and ensure the accuracy of the test data.
Intelligent configuration such as limit protection, overload protection and automatic return to ensure the user's operation safety.
Support LystemTM laboratory data sharing system to achieve unified management of test data.
5, the test process
(1) Cut 10 strips of length from the three heat seal edges of the sample bag and unfold 10 strips of 100 mm length.
(2) Set parameter information such as sample width and test speed.
(3) Clamp the two ends of the strip on the two clamps. The long axis of the strip should coincide with the center line of the two clamps.
(4) Click the Start Test option and the test begins. The instrument automatically records the force values ​​during the test and calculates the test results.
6, test results
The test results are as follows: the average heat seal strength of the upper seal is 22.145 N/15 mm, the average heat seal strength of the lower seal is 23.114 N/15 mm, and the average heat seal strength of the side seal is 11.256 N/15 mm.
7. Conclusion
From the above test results, the side seals and the upper and lower seals have different heat seal strengths and low strength values, which may lead to product leakage or bag breakage at the side seals. It is recommended that the manufacturer be producing. The relevant performance tests such as heat seal strength and sealing performance should be strengthened before the link and before leaving the factory. XLW-PC intelligent electronic tensile testing machine is a professional instrument for the sealing strength of composite film packaging. It has the advantages of reliable test results, simple equipment operation and high test efficiency. It truly reflects the heat sealing performance of plastic composite film packaging of quick-frozen products. As a leader in the development and manufacturing of packaging inspection equipment, Labthink provides professional, high-end packaging inspection equipment and testing services to customers around the world. Learn about its related testing equipment, you can. Jinan Languang Electromechanical Technology Co., Ltd. is willing to enhance technical exchanges and cooperation with enterprises and institutions in the industry.