Source: Link Testing Instruments co.,ltd
Fish and other edible parts are rich in protein, low-fat and polyunsaturated fatty acids, multi-vitamins and inorganic substances. It can adjust and improve the structure of human food and supply nutrients necessary for human health. Canned fish is convenient and nutritious because of Rich and easy to carry, it is favored by consumers. Canned fish generally use tinplate cans, glass cans, composite film cooking bags or other packaging materials.
Heat-sealing strength, also known as heat-sealing strength or sealing strength, is an index for evaluating the sealing strength of heat-sealed parts of food packaging. If the heat-sealing effect is significantly stronger than the composite fastness, the heat-sealed part is not easy to unpack, but the composite material is peeled off and layered. If the heat sealing strength is insufficient, the finished packaging will have problems such as openings, air leakage, broken bags, etc., which will not only reduce the brand image of the product, but even cause quality problems such as moldy and swelling of the canned fish, which will seriously affect the competitiveness of the company's products and the company Diminishing benefits. Therefore, the aluminum-plastic composite film of canned fish meat in food enterprises should have excellent heat sealing strength to ensure product packaging and sealing performance.
Test method and instrument
The domestic testing standards for the heat seal strength of plastic film packaging bags mainly refer to QB/T 2358 "Test Method for Heat Seal Strength of Plastic Film Packaging Bags". The test can be done with the LTS-05 Auto tensile testing machine independently developed and designed by Link Testing Instruments Co.,Ltd
Test principle:
The sample is clamped between the two chucks of the fixture, the two chucks move in opposite directions, and the force value sensor located on the movable chuck and the displacement sensor built in the machine are used to collect the force during the test. Value change and displacement change, so as to calculate the performance indicators such as heat seal strength and tensile strength of the sample.
Test sample and test process
Test sample: Aluminium-plastic composite film packaging for fish cans provided by a food factory.
Experimental procedure:
(1) Cut out 10 sample strips with a width of 15mm and an unfolded length of 100mm from the four heat-sealed edges of the packaging bag.
(2) Set parameter information such as sample width and test speed.
(3) Clamp both ends of the sample strip on the two clamps respectively. The long axis direction of the sample strip should coincide with the center line of the two clamps.
(4) Click the start test option to start the test. The instrument automatically records the force value during the test and calculates the test result.
Test results and analysis
The average values of the heat seal strength of the upper, lower and side seals of the aluminum-plastic composite film package tested in this article are 26.119 N/15mm, 328.087 N/15mm, 68.206 N/15mm, respectively.
Judging from the above test results, the heat sealing strength values of the upper and lower sealing edges are both low, and leakage or damage may occur at the two sealing edges during the circulation and transportation. It is recommended that the manufacturer produces and before leaving the factory. The testing of heat seal strength and sealing performance should be strengthened. In addition, the product pressure resistance and other project tests should be strengthened.
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