ã€Chinese Packaging Network News】 Abstract: Potato chips are crispy foods made from potato slices that remove water, so the moisture content in the chips is extremely low and it is a puffed food that is very sensitive to moisture. This article uses the Labthink blue light W3/230 water vapor transmission rate test system to test the water vapor transmission rate of the aluminized composite film for potato chips packaging, and introduces the test principle, equipment parameters and other information of the equipment, and details the basic process of the test. , thus providing enterprises with a method for the detection of water-repellent (wet) properties of soft plastic packaging or containers.
Keywords: water vapour permeability, water resistance, moisture resistance, water vapour permeability test system, soft plastic packaging, packaging containers, potato chips, potato and puffed food, crispy
1, the meaning
Potato chips are expanded potato products made from potatoes. The potatoes are cut into thin slices and then fried or baked and seasoned. After frying or baking, the moisture in the potato chips is very low. When stored in a high humidity environment, the potato chips easily absorb the water vapor in the environment, resulting in a reduction in the crunchiness of the potato chips and a deterioration of the mouthfeel. Therefore, keeping the potato chips in a low-humidity space environment is an important condition for ensuring that the potato chips are of good quality during the shelf life. The water vapor transmission rate of the soft plastic packaging used is an important factor that determines the content of water vapor in the space environment where the potato chips are located, that is, it has an important influence on the quality of the potato chips. In general, high water vapor transmission rate indicates that the soft plastic packaging has poor water resistance (wet) and the potato chips are susceptible to moisture.
2, the status quo
At present, domestic methods for measuring the water vapor transmission rate of soft plastic packaging include weighing method (cup method), electrolysis method, humidity method, and infrared sensor. The reference standards are GB 1037-1988 "Plastic film and Test method for steam permeability of sheets - Cup method, GB/T "Test method for moisture permeability of packaging materials", GB/T "Determination of water vapour permeability of plastic films and sheets - Electrolytic sensors Method, GB/T "Determination of Water Vapor Transmission Rate of Plastic Films and Sheets Humidity Sensor Method" (published, implemented on December 1, 2014), GB/T "plastic film and sheet water Determination of Vapor Transmission Rate by Infrared Detector Method". The standard referenced herein is GB/T "Infrared Detector Method for Determination of Water Vapor Transmission Rate of Plastic Films and Sheets".
3, test sample
A brand of aluminized composite film for packaging potato chips.
4, testing equipment
In this paper, the W3/230 water vapor transmission rate test system independently researched and developed by Jinan Languang Electromechanical Technology Co., Ltd. was used to inspect aluminum composite film samples for potato chips packaging.
4.1 Test principle
This equipment adopts the infrared sensor method test principle. The pre-treated sample is clamped between the test chambers. Nitrogen with stable humidity flows on one side of the sample, and dry nitrogen flows on the other side of the sample. Under the influence of the difference in humidity, water vapor will diffuse from the high humidity side through the sample to the low humidity side, and be carried by the nitrogen gas flowing on the low humidity side to the infrared sensor to generate the same proportion of electrical signals. Through the analysis of the electrical signals, The water vapor transmission rate and other parameters of the sample were obtained. For the packaging container, dry nitrogen flows in the container and the outside of the container is in a highly humid state.
4.2 Application
(1) Films: Suitable for water vapor of film materials such as various plastic films, plastic composite films, paper-plastic composite films, co-extruded films, aluminized films, aluminum foils, aluminum-plastic composite films, and glass fiber aluminum foil composite films. Transmission test.
(2) Sheets: It is applicable to the test of water vapor transmission rate of sheet materials such as PP sheet, PVC sheet, PVDC sheet, etc. for various engineering plastics, rubber, and building materials.
(3) Paper: It is applicable to the test of water vapor transmission rate of paper, paperboard and composite materials, such as aluminized film of tobacco package, aluminum-plastic composite film sheet and so on.
(4) Containers: Suitable for testing the water vapor transmission rate of bottles, bags, cans, boxes, barrels, etc. made of plastic, rubber, paper, paper-plastic composite, glass, metal, etc., such as Coke bottles, peanut oil drums, etc. Tetra packaging, vacuum packaging bags, metal three-piece cans, plastic cosmetic hose packaging, toothpaste tube packaging, jelly cups and so on.
(5) Extended application: It can be applied to the water vapor transmission rate test of products and packaging such as liquid crystal display film, medical blister, sterile protective film, automobile fuel tank, and battery plastic housing.
(6) Standard: This equipment meets various national and international standards such as ISO 15106-2, ASTM F1249, GB/T 26253, TAPPI T557, JIS K7129.
4.3 Equipment Parameters
l The test range of film samples is 0.01 ~ 40 g/m2·24h, and the test range of 0.1 ~ 1000 g/m2·24h can be selected according to actual needs; the test range of the container sample is 0.0001 ~ 0.2 g/pkg d.
l One test can test three samples at the same time, and the test data are independent.
l The device's temperature control range is 15°C ~ 55°C, temperature control accuracy is ±0.1°C, humidity control range is 0%RH, 35%RH ~ 90%RH, 100%RH, and humidity control accuracy is ±1%RH.
l Artificial, proportional and cyclic test modes provide suitable detection methods for materials with different barrier properties.
l Provide a standard membrane for system calibration to ensure the accuracy and versatility of the test data.
l Support LystemTM laboratory data management system, unified management of test results and test reports.
5, test steps
(1) Use a cutting tool to uniformly cut three specimens of 108 mm × 108 mm from the specimen surface.
(2) Apply a layer of vacuum grease along the perimeter of the test chamber, affix the specimen to the test chamber, and clamp it with the specimen clamping mechanism.
(3) Set the test temperature, humidity, sample thickness, etc., and click the test option to start the test.
(4) The equipment automatically calculates the water vapor transmission rate of the sample based on the monitored signal value.
6, test results
The water vapor transmission rates of the three aluminum coated composite film samples for packaging tested in this article were 0.813 g/m2·24h, 0.785 g/m2·24h, and 0.837 g/m2·24h, respectively.
7. Conclusion
Water vapor transmission rate is a very important reference index for screening film materials for packaging of potato chips. In this paper, W3/230 water vapor transmission rate testing system was used to detect the water vapor transmission rate of certain brands of potato chips packaging materials. The test results are reproducible and accurate. In addition to film materials, this equipment can also be used for water vapour permeability test of various types of packaging bottles, cans, barrels, hoses and other container samples. It is a wide range of testing equipment. Jinan Languang Electromechanical Technology Co., Ltd. has always been committed to providing professional testing equipment and services to customers around the world, to understand Labthink other types of testing equipment, such as oxygen permeability testing equipment, gas transmission rate testing equipment, sealing tester , Heat seal tester, intelligent electronic tensile tester, tear tester, friction coefficient tester, etc. You can log in to view detailed information or to inquire. Labthink looks forward to working with companies and institutions in the industry to increase technical exchanges and cooperation!