Detection of moisture barrier properties of biscuit packaging using W3/031 moisture permeability tester

Abstract: The moisture barrier property of biscuit packaging bags is an important factor affecting whether the packaged biscuits are easy to soften. It is an important reference index for enterprises in screening packaging materials. This paper uses the W3/031 water vapor transmission rate tester designed and produced by Jinan Languang Electromechanical Technology Co., Ltd. to test the water vapor transmission rate of biscuit packaging, briefly introduces the testing principle of the equipment, the parameters of the equipment and the scope of application, and describes Throughout the test process, it provides a simple and feasible test method for the company to test the moisture resistance of packaging.

Key words: moisture barrier, water vapor transmission rate, soft plastic packaging, water vapor transmission rate tester, biscuits, cakes, crispness

1 , meaning

Biscuits are a kind of crispy snack food. They are made of wheat flour as the main raw material. They are added with sugar, oil and other auxiliary materials. They are made by baking process. They are often used as snacks for people to leisurely travel and relax when they are relaxed. Biscuits are sensitive to moisture. When they are in a high-moisture environment, they easily absorb water vapor in the environment, which leads to a decrease in crispness of biscuits, and even creates a good condition for the growth and reproduction of microorganisms, causing mold problems in biscuits. Therefore, it is of great significance to maintain the good quality of the biscuit by improving the moisture resistance of the biscuit package and reducing the water vapor content inside the package.

Figure 1 biscuit packaging example

2 , the status quo

The commonly used packaging for biscuits is mainly plastic composite film and aluminized composite film. At present, the domestic test methods for water vapor transmission rate of soft plastic packaging include weighing method ( cup method ) , electrolysis method, humidity method and infrared method. The method standard that can be referred to is GB 1037-1988 "plastic film and sheet" Water vapor permeability test method cup type method, GB/T 16928-1997 "Packaging material test method moisture permeability", GB/T 21529-2008 "Determination of water vapor transmission rate of plastic film and sheet - Electrolytic sensor method" , GB / T 30412-2013 "water vapor transmission rate of plastic film and sheet of the humidity sensor measurement method" (published 2014 December 1 embodiment).

3 , test samples

Aluminized composite film for packaging a biscuit.

4 , testing equipment

In this paper, the Labthink Blue Light W3/031 Water Vapor Transmission Rate Tester is used to detect aluminum-coated composite film samples for biscuit packaging.

Figure 2 W3/031 water vapor transmission rate tester

4.1 Test principle

This equipment is designed using the weighing method test principle. During the test, the sample is clamped in the moisture permeable cup, and the humidity on both sides of the sample is different. There is a certain humidity difference. According to the gas diffusion principle, the water vapor will pass through the sample from the high humidity side to the dry side. , thereby causing a change in the weight of the moisture permeable cup. By measuring the change in the weight of the moisture permeable cup over time, the test results such as the water vapor transmission rate of the sample can be obtained.

4.2 Scope of application

  • Film material: suitable for water vapor transmission rate of film materials such as plastic film, plastic composite film, paper-plastic composite film, geomembrane, co-extruded film, aluminized film, aluminum foil, aluminum foil composite film, waterproof breathable film, etc. test.
  • Sheet: Suitable for testing the water vapor transmission rate of various engineering plastics, rubber, building materials ( waterproof materials for construction ) , insulation materials, etc., such as PP sheet, PVC sheet, PVDC sheet, nylon sheet Materials and so on.
  • Paper, cardboard: Suitable for testing the water vapor transmission rate of paper and cardboard.
  • Textiles, non-woven fabrics: Suitable for testing the water vapor transmission rate of textiles, non-woven fabrics and other materials.
  • Extended application: This device can also be extended to test the water vapor transmission rate of liquid crystal display film, solar back panel, sterile protective film, cosmetic mask, protective clothing material and so on.
  • This equipment meets a number of national and international standards, such as GB1037 , GB/T16928 , ASTM E96 , ASTM D1653 , TAPPI T464 , ISO2528 , DIN53122-1 , JIS Z0208 , YBB00092003 .

4.3 Equipment parameters

  • The test range of this equipment is 0.1 ~ 10000 g / m 2 · 24h , and the test accuracy is 0.01 g / m 2 · 24h .
  • This equipment can realize the simultaneous test of 3 samples, that is , the test results of 3 samples can be obtained in one test.
  • The test temperature range of this equipment is 15 ~ 55 °C , the temperature control accuracy is ±0.1 °C , the test humidity is 10%RH ~ 98%RH , and the humidity control accuracy is ±1%RH .
  • The standard purge wind speed ensures a constant humidity difference inside and outside the moisture permeable cup.
  • Two standard calibration methods, standard film and standard weight, are provided to ensure the accuracy and versatility of the test data.
  • The wetting cup weighing method designed by the patented mechanical structure effectively ensures the accuracy and stability of the data.
  • Support Lystem TM laboratory data sharing system, easy to achieve centralized and systematic management of laboratory test data.
  • The calibration data recovery function effectively solves the adverse effects caused by misoperation. Zui greatly guarantees the security of the system work. The system can repair the key information data according to the method specified by the user, such as the calibration data recovery of each sensor. operating.

5 , the test process

(1) Three pieces of a sample having a diameter of 74 mm were cut out from the surface of the biscuit-coated aluminum-plated composite film sample by a cutter .

(2) A certain amount of distilled water was added to the three moisture permeable cups, and three samples were separately clamped to the three moisture permeable cups.

Figure 3 moisture permeable cup

(3) Open the test chamber door, place the three moisture permeable cups of the sample placed on the moisture permeable cup holder in the test chamber, and close the test chamber door.

(4) In the software system of the device, set parameter information such as sample thickness, sample temperature and humidity, click the test option, and the test starts. The device automatically tests the weight of the moisture permeable cup at set intervals, and calculates and displays the test results of the water vapor transmission rate of the sample based on the test data.

6 , test results

Test aluminum composite film packaging biscuits three specimens vapor permeability test results 1.032 g / m 2 · 24h, 1.061 g / m 2 · 24h, 1.027 g / m 2 · 24h.

7 , conclusion

Among the various performance indicators of biscuit packaging, water vapor transmission rate is one of the more important detection indicators, and the value of this index will have a direct impact on the quality of biscuits during the shelf life. W3/031 Water Vapor Transmission Rate Tester is a testing equipment for water vapor transmission rate test of soft plastic packaging. The equipment is simple in operation, high in intelligence, high in test efficiency and highly reproducible in test results. Accuracy, can truly reflect the sample's barrier to water vapor. Labthink has been committed to providing professional package inspection equipment and services to customers around the world. In addition to the water vapor transmission rate tester, we can also provide you with intelligent electronic tensile testing machine, thickness gauge, sealer and oxygen transmission rate. Test equipment, friction coefficient meter, tear meter, heat seal tester, impact tester, carton compression machine and other testing equipment, related equipment information can be found at . Com view or call directly advisory. The more you understand, the more you trust! Labthink is willing to promote technical exchanges and cooperation with enterprises and institutions in the industry.

Copyright statement: Article Copyright Jinan Languang Electromechanical Technology Co., Ltd., reprinted without permission!


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