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    Home > Active Ingredient News > Drugs Articles > Detection and solution of sealing strength of PE black and white film packaging for liquid milk

    Detection and solution of sealing strength of PE black and white film packaging for liquid milk

    • Last Update: 2015-05-12
    • Source: Internet
    • Author: User
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    Abstract: PE black and white film packaging is often used for liquid milk, but the leakage of liquid milk at the sealing place often occurs due to the improper sealing strength of this kind of packaging How to ensure the good sealing strength to meet the sealing effect of intact packaging needs to be tested This paper adopts XLW (PC) developed by Jinan Languang Electromechanical Technology Co., Ltd Intelligent electronic tensile testing machine tests the sealing strength (also known as heat sealing strength or heat sealing strength or sealing strength or sealing strength) of a brand of liquid milk black-and-white film packaging bag, and introduces the principle, operation steps and application scope of its testing equipment in detail, so as to provide certain technical guidance value for controlling the heat sealing effect of liquid milk packaging bag Key words: sealing strength, heat sealing strength, heat sealing strength, sealing strength, liquid milk, dairy products, PE black-and-white film packaging bag, soft plastic packaging bag, intelligent electronic tensile testing machine, sealing rupture, leakage, over sealing 1, significance The packaging forms of liquid milk are mainly divided into bag, box and bottle Because the bag liquid milk is easy to carry, the cost of packaging materials is low, and some important properties such as the barrier of packaging materials can meet the quality requirements within the shelf life of liquid milk, so the bag form is favored by dairy production enterprises Bag liquid milk is mainly divided into two categories: bales and sterile pillows The cost of sterile pillow packaging is relatively high, so bales are more widely used in terms of public benefits Baili usually uses black-and-white membrane and milk white membrane Due to the barrier deviation of milk white membrane, the shelf life of the liquid milk packaged is short, generally only 3-5 days The black-and-white film can be added with high barrier resin raw materials to extend the shelf life of the liquid milk packed with black-and-white film, so the liquid milk packed in bags is mainly packed with black-and-white film Liquid milk black-and-white film is a kind of CO extrusion film, which is mainly made of PE of different types as the main resin raw material, adding barrier resin raw material according to the needs of liquid milk quality, and then mixing black-and-white masterbatch The heat sealing effect of black and white film packaging and sealing of liquid milk PE is related to the PE model used and its adding proportion, and the parameter setting of heat sealing equipment If there is PE model resin with good heat viscosity, wide heat sealing temperature range, and excellent inclusion heat sealing resistance, the heat sealing strength and sealing performance of sealing can be guaranteed to be high However, in addition to ensuring the good heat sealing performance of PE black and white film materials, the heat sealing temperature, pressure, time and other parameters set by the heat sealing equipment are also crucial to the sealing quality If the above heat sealing parameters are too large or too small, they will cause quality problems such as cracking or leakage at the sealing part of the package Therefore, we should strictly monitor the sealing effect of black and white film packaging of liquid milk PE, which is usually characterized by "sealing strength", also known as "heat sealing strength", "sealing strength" and "heat sealing strength" In general, the higher the strength value is, the stronger the sealing is, but it is not that the higher the sealing strength value is, the better the sealing is This paper introduces the detection method and test phenomenon of sealing strength of PE black and white film packaging bag for fresh milk 2 At present, liquid milk black and white film packaging is mainly in the form of three side sealing, that is, three sides of the packaging bag are formed by heat sealing According to the test of sealing strength of this type of packaging bag, the standard commonly used in China is QB / T 2358-1998 test method of thermal sealing strength of plastic film packaging bag Figure 1 PE black-and-white film packaging of liquid milk 3 Pure milk packaged with PE black-and-white film of a brand purchased randomly in the test sample market 4 This paper uses Labthink XLW (PC) intelligent electronic tensile testing machine to test the sealing strength of pure milk packaging bag Figure 2 test principle of XLW (PC) intelligent electronic tensile tester 4.1 The sample is clamped between the two collets of the fixture, and the two collets do relative movement Through the force value sensor on the dynamic collet and the displacement sensor built in the machine, the force value change and displacement change in the test process are collected, and then the sealing strength, tensile strength, tear, deformation rate and other performance indexes of the sample are calculated 4.2 scope of application (1) XLW (PC) The intelligent electronic tensile testing machine is applicable to the heat sealing, stretching, peeling, deformation, tearing, adhesion, puncture force, opening force, tearing force of plastic film, composite material, soft packaging material, plastic hose, adhesive, adhesive tape, adhesive tape, medical paste, release paper, protective film, combination cover, metal foil, diaphragm, magnetic card, non-woven fabric, rubber, paper and other products Test of low speed unwinding force, drawing force and pressure resistance (2) XLW (PC) intelligent electronic tensile testing machine conforms to GB 8808, GB / T 1040.1 ~ 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 2792, GB / T 17590, QB / T 1130, QB / T 2358, ASTM E4, ASTM d882, ASTM D1938, ISO 37, ASTM D 3330, ASTM f88, ASTM F904, JIS P8113 and other national and international standards 4.3 there are two specifications for performance parameters: 500N and 50N The test accuracy is as high as 0.5, which effectively guarantees the accuracy of test results The equipment supports the two-way test mode of tension and compression Under the two test modes, the test speed can be set arbitrarily from the seven modes of 50 mm / min, 100 mm / min, 150 mm / min, 200 mm / min, 250 mm / min, 300 mm / min and 500 mm / min The equipment adopts pneumatic clamp, which can effectively prevent the sample from slipping The ultra long stroke of 1000 mm can meet the test of materials with super deformation rate Through intelligent configuration of limit protection, overload protection and automatic return, the operation safety of users can be protected More than 100 different sample clamps are configured for users to choose, which can meet the test requirements of more than 1000 materials, and provide customized services according to different test materials 5 During the test (1) use the sampler to cut 10 samples from each hot sealing edge of the purchased liquid milk packaging bag (it needs to be cut from three different packaging bags of the same sample), the width of the sample is 15 mm, and the development length is 100 mm (2) The test parameters such as width, thickness and test speed are set in the software of the tensile testing machine (3) Unfold and clamp the specimen on the fixture, so that the long axis direction of the specimen coincides with the center line of the fixture Fig 3 Schematic diagram of sample clamping (4) click the start test button in the software to start the test The system automatically calculates and records the test results 6 The results showed that the average heat sealing strength of 10 upper edge samples, 10 lower edge samples and 10 side edge samples were 20.044 n / 15mm, 19.781 n / 15mm and 22.407 n / 15mm respectively 7 Conclusion the Labthink blue light XLW (PC) intelligent electronic tensile testing machine has the advantages of test results and high test efficiency in detecting the sealing strength of black and white film packaging bags for liquid milk The equipment can also be used to test the sealing strength of liquid milk aseptic pillow, aseptic brick, milk white film and other soft plastic materials, as well as the peel strength, tensile strength and deformation rate, puncture resistance, tear resistance and other properties of various soft plastic packaging It is a multifunctional and cost-effective testing instrument In addition to the sealing strength, the liquid milk packaging also needs to pay attention to its oxygen transmission, friction coefficient, sealing and other index performance Labthink Languang, the relevant testing instrument, can provide you with detailed information of the instrument You can log in Languang company to check and call for consultation Labthink is looking forward to enhancing technical exchanges and cooperation with enterprises and institutions in the industry.
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