ã€Chinese Packaging Network News】 Liquid milk often used PE black and white film packaging, but this type of packaging often occur due to improper seal strength and liquid leakage at the closure of the sealing phenomenon, how to ensure a good seal strength to meet the integrity of the packaging seal The effect requires relevant testing. This article uses the XLW (PC) intelligent electronic tensile tester independently developed by Jinan Languang Electromechanical Technology Co., Ltd. to test the sealing strength of a brand of liquid milk black and white film packaging bags (also known as heat seal strength or heat seal strength or seal strength or seal Strength), details the principle of its detection equipment, operating procedures and application of information and other information, in order to control the liquid milk packaging bag sealing effect to provide a certain technical guidance value.
1, the meaning
The packaging of liquid milk is mainly divided into bagged, boxed and bottled, in which the bagged liquid milk is easy to carry, the cost of the used packaging material is low, and the barrier properties of some bag materials and other important properties can satisfy the liquid milk. Due to the quality requirements during the shelf life, the bag form is quite popular among dairy product manufacturers. The bagged liquid milk is mainly divided into two categories: Bailibao and aseptic pillows. The cost of the aseptic pillow packaging is relatively high. Therefore, considering the popular benefits, the use of Bailibao is more extensive. Bailibao's commonly used materials are black and white films and milky white films. Due to the barrier property of milky white films, the liquid milk packaged has a shorter shelf life, generally only 3-5 days. The addition of a high barrier resin material to the black and white film can prolong the shelf life of the black and white film packaged liquid milk, so the bagged liquid milk is mainly based on black and white film packaging.
Liquid milk black and white film is mainly based on different types of PE as the main resin raw material, according to the liquid milk quality needs to choose to add barrier resin raw materials, and then mixed into black and white masterbatch co-extruded co-extruded film. The sealing effect of liquid milk PE black and white film packaging seal is related to the type of PE used and its added ratio, and the parameter setting of the heat sealing equipment, if it contains a good thermal viscosity, a wide range of heat sealing temperature, heat sealing of inclusions The more excellent PE type resin can guarantee higher heat sealing strength and better sealing performance. However, besides ensuring the good heat sealability of the PE black and white film's own material, the heat sealing temperature, pressure, and time set by the heat sealing equipment are also critical to the sealing quality. If the above heat sealing parameters are too large or too small, the parameters will be critical. Causes cracks or leaks in the sealing area of ​​the package. Therefore, the heat-sealing effect of liquid milk black and white film packaging seals should be strictly monitored. Usually, the seal strength indicators are used to characterize the seals, also known as heat seal strength, seal strength, and heat seal strength. The higher the general strength value, the stronger the seal, but It is not so good that the seal strength value is better, and it is necessary to comprehensively determine the heat sealing effect of the seal in conjunction with the relevant test phenomenon. In this paper, the method of detecting the sealing strength and the test phenomenon of the fresh milk PE black and white film packaging bag are introduced.
2, the status quo
The liquid milk black and white film packaging is mainly in the form of a three-side seal, ie, three sides of the packaging bag are formed by heat sealing. For the detection of the sealing strength of this type of packaging bag, the standard currently used in the country is QB/T 2358-1998 "Test method for heat sealing strength of plastic film packaging bag".
3, test sample
A brand of PE black and white film-packed pure milk was purchased on the market at random.
4, equipment
This article uses Labthink Languang XLW (PC) intelligent electronic tensile testing machine to test the sealing strength of pure milk packaging bags.
This article uses Labthink Languang XLW (PC) intelligent electronic tensile testing machine to test the sealing strength of pure milk packaging bags.
4.1 Test principle
The sample is clamped between the two clamps of the clamp. The two clamps move relative to each other. The force value sensor and the built-in displacement sensor on the movable clamp are used to collect the force value change and displacement during the test. Changes were made to calculate the seal strength, tensile strength, tear strength, and deformation rate of the sample.
4.2 Application
(1) XLW (PC) intelligent electronic tensile testing machine is suitable for plastic film, composite materials, soft packaging materials, plastic hoses, adhesives, adhesive tapes, stickers, medical patches, release paper, protective film, Combining covers, foils, separators, magnetic cards, nonwovens, rubber, paper and other products for heat sealing, stretching, peeling, deformation, tearing, bonding, puncture force, opening force, tearing force, low speed unwinding force , drawing force, resistance to pressure and other performance tests.
(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 many other national and international standards.
4.3 Performance Parameters
l There are 500 N, 50 N two kinds of specifications to choose from, the test precision is as high as 0.5, have guaranteed the test result accuracy effectively. l The equipment supports pull and press bidirectional test modes. In both test modes, the test speed can be from 50 mm/min, 100 mm/min, 150 mm/min, 200 mm/min, 250 mm/min, 300 mm/ In any of the seven modes of min and 500 mm/min. l The equipment adopts pneumatic clamping, which can effectively prevent the sample from slipping. L1000 mm long stroke can meet the test of large deformation rate materials. l Protect the user's operation safety through intelligent configuration such as limit protection, overload protection and automatic return. l Configure more than 100 different sample holders for users to choose, which can meet the testing requirements of more than 1000 kinds of materials, and provide customized services according to the different materials.
5, the test process
(1) Use a sampler to cut 10 samples from each heat sealing edge of purchased liquid milk packaging bag (required to cut from 3 different packaging bags of the same sample). The width of the sample is 15 mm. The deployment length is 100 mm. (2) Set test parameters such as specimen width, thickness, and test speed in the software configured in the tensile tester. (3) The sample is unfolded and clamped on the jig so that the long axis direction of the sample coincides with the center line of the jig. (4) Click the Start Test button in the software to start the test. The system automatically calculates and records the test results.
(1) Use a sampler to cut 10 samples from each heat sealing edge of purchased liquid milk packaging bag (required to cut from 3 different packaging bags of the same sample). The width of the sample is 15 mm. The deployment length is 100 mm. (2) Set test parameters such as specimen width, thickness, and test speed in the software configured in the tensile tester. (3) The sample is unfolded and clamped on the jig so that the long axis direction of the sample coincides with the center line of the jig. (4) Click the Start Test button in the software to start the test. The system automatically calculates and records the test results.
6, test results
The top-down package is used as the basis for judging the upper seal, lower seal, and side seal. The average value of the heat seal strength of the 10 upper seal samples cut from the 3 bags is 20.044 N/. The average heat-seal strength of 15mm, 10 lower seal samples was 19.781 N/15mm, and the average heat seal strength of 10 side seal samples was 22.407 N/15mm.
The top-down package is used as the basis for judging the upper seal, lower seal, and side seal. The average value of the heat seal strength of the 10 upper seal samples cut from the 3 bags is 20.044 N/. The average heat-seal strength of 15mm, 10 lower seal samples was 19.781 N/15mm, and the average heat seal strength of 10 side seal samples was 22.407 N/15mm.
7. Conclusion
Labthink Languang XLW (PC) intelligent electronic tensile testing machine has the advantages of accurate test results and high test efficiency in detecting the sealing strength of liquid milk black and white film packaging bags. The device can also be used to test the sealing strength of soft plastic materials such as liquid milk aseptic pillows, aseptic bricks and milky white films. It can also test the peel strength, tensile strength and deformation rate, and puncture resistance of various types of soft plastic packaging. Tear force and other performance, is a versatile, cost-effective detection equipment. In addition to the seal strength, liquid milk packaging also needs to pay attention to its oxygen permeability, friction coefficient, sealing performance and other indicators, the relevant testing instruments Labthink Languang can provide you, the instrument's detailed information you can visit to view the consultation. Labthink expects to enhance the technical exchanges and cooperation with enterprises and institutions in the industry.
Labthink Languang XLW (PC) intelligent electronic tensile testing machine has the advantages of accurate test results and high test efficiency in detecting the sealing strength of liquid milk black and white film packaging bags. The device can also be used to test the sealing strength of soft plastic materials such as liquid milk aseptic pillows, aseptic bricks and milky white films. It can also test the peel strength, tensile strength and deformation rate, and puncture resistance of various types of soft plastic packaging. Tear force and other performance, is a versatile, cost-effective detection equipment. In addition to the seal strength, liquid milk packaging also needs to pay attention to its oxygen permeability, friction coefficient, sealing performance and other indicators, the relevant testing instruments Labthink Languang can provide you, the instrument's detailed information you can visit to view the consultation. Labthink expects to enhance the technical exchanges and cooperation with enterprises and institutions in the industry.