Verification method for moisture resistance of aluminum-plastic packaging for roasted products

[China Packaging Network News] Roasted product itself is very nutritious, contains a lot of vitamins, proteins and oil components, and needs to strengthen the monitoring of moisture barrier properties. In this paper, Labthink Languang W3/031 water vapor permeability tester was used to test the water vapor barrier performance of aluminum and plastic packaging products in the oil-and-roasted products. The basic process of the test, the testing principle, and the applicable scope of the test equipment were introduced. Select the moisture permeability test equipment and test methods can be referenced.

The roasted seeds and nuts are the type of snack foods made by drying, drying, frying and other processing methods for people to eat in their leisure time, such as seeds, broad beans, peanuts, walnuts, chestnuts, and beans. The roasted products are generally packaged using plastic composite film, aluminum composite film, aluminum plastic composite film, paper aluminum plastic composite film, plastic cans, etc. The packaging should have good moisture resistance performance, because the roasted products in a high humidity environment, the product is easy Absorption of water vapour in the environment leads to moldy and flaky taste, increases the risk of product deterioration and taste changes, and shortens shelf life. Therefore, the barrier properties of packaging materials to water vapor must be strictly controlled to ensure the tightness of the finished product packaging.

Fig. 1 Roasted goods paper aluminum plastic packaging

2, reference standards

Domestic water vapor barrier test methods for composite film and sheet packaging include weighing method (cup method), electrolysis method, infrared method and humidity method. The reference method standards are GB/T 1037 "plastic films and sheets. Water vapor permeability test method cup method, GB/T 21529 "determination of water vapor transmission rate of plastic film and thin film electrolysis sensor method", GB/T 26253 "measurement of water vapor transmission rate of plastic film and sheet infrared detector "Method", GB/T 30412 "Plastic film and sheet moisture vapor transmission rate determination of humidity sensor method", the reference standard for this article is GB/T 1037-1988 "Plastic film and sheet permeable vapor test method cup method."

3, test sample

Three types of roasted seeds and pans used by a food company are aluminum-plastic packaging.

4, test equipment

Jinan Languang Electromechanical Technology Co., Ltd. independently developed W3/031 water vapor transmission rate tester.

Figure 2 W3/031 Water Vapor Transmission Tester

4.1 Test principle

W3/031 adopts the wet cup weighing method test principle. At a certain temperature, a specific humidity difference is formed on both sides of the sample. Water vapor passes through the sample in the moisture permeable cup and enters the dry side. The amount of change in the weight of the moisture-permeable cup over time determines the parameters such as the water vapor transmission rate of the sample.

4.2 Application

(1) This equipment is suitable for water vapour permeability testing of plastic films, sheets, paper, cardboard and their textiles, non-woven fabrics and other packaging.

l Film materials: suitable for water vapour transmission of film materials such as various plastic films, plastic composite films, paper-plastic composite films, geomembrane, coextruded films, aluminized films, aluminum foils, aluminum foil composite films, waterproof breathable films, etc. Rate test

l Sheets: Water vapour permeability test for sheet materials such as various engineering plastics, rubber, building materials (building waterproofing materials), insulation materials, such as PP sheet, PVC sheet, PVDC sheet, nylon Sheets, etc.

l Textiles, non-woven fabrics are suitable for testing the water vapor transmission rate of textiles, non-woven fabrics and other materials;

l It is also suitable for water vapour permeability test of liquid crystal display film, solar back sheet, sterile protective film, beauty mask and other materials;

(2) This equipment can meet many national and international standards such as GB 1037, GB/T 16928, ASTM E96, ASTM D1653, TAPPI T464, ISO 2528, DIN 53122-1, JIS Z0208, YBB.

4.3 Equipment Parameters

l Test range: 0.1 ~ 10,000 g/m2·24h

l Number of samples: 1 to 3 pieces (data are independent)

l Resolution: 0.0001 g

l Test temperature range: 15 °C ~ 55 °C, temperature control accuracy ± 0.1 °C

l Test humidity range: 10%RH ~ 98%RH (standard 90%RH), temperature control accuracy ±1%RH

l With the LystemTM laboratory data sharing system, test data and device information can be reported simply by setting up and operating, making it easy to centralize and systematically manage laboratory test data.

5, the test process

(1) Three specimens with a diameter of 74 mm are sampled for each of the three kinds of samples by a sampler.

(2) Place the sample on a moisture permeable cup and close the glass seal door.

(3) Set parameters such as sample name, sample thickness, test temperature, and test humidity.

(4) Start the air source and click the "Start test" option.

(5) After the test is completed, the instrument automatically calculates and displays the test results.

6, test results

The water vapour transmission rates in this paper were: 3.5612 g/(m2·24h), 5.1637 g/(m2·24h), and 0.8231 g/(m2·24h).

7. Conclusion

The W3/031 Water Vapor Transmission Rate Test System is a professional instrument for testing the water vapor transmission rate of thin films. The device is easy to operate, has high test accuracy, good repeatability, and can accurately reflect the moisture resistance of the package. By comparing the results of the three sample tests, it can be seen that the third sample has the best moisture resistance. The packaging of roasted seeds and nuts products needs to be concerned with the properties of oxygen barrier, sealing performance, and heat-sealing strength to prevent the products from oxidizing and deteriorating, and to extend the shelf life of products. For related testing equipment and testing services, you can log in to view specific information or to inquire. The more you understand, the more you trust! Jinan Languang Electromechanical Technology Co., Ltd. would like to take this opportunity to enhance the technical exchanges and cooperation with enterprises and institutions in the industry.