Test method for moisture resistance of biscuits

ã€Chinese Packaging Network Newsã€‘Biscuit is a kind of crispy snack food. It is based on wheat flour as the main raw material, adding sugar, grease and other auxiliary materials, and is made through baking process. It is often used as a temporary hungry or pastime for people to travel, rest and relax. Time snacks. Biscuits are relatively sensitive to moisture, and when in a high-water environment, they easily absorb water vapor in the environment, leading to a reduction in the crispiness of biscuits, and even creating a good condition for the growth and reproduction of microorganisms, causing mould problems in biscuits. Therefore, by improving the moisture resistance of the biscuit package and reducing the water vapor content inside the package, it is of great significance for maintaining the good quality of the biscuit.

2, the status quo

The commonly used packaging for biscuits is mainly plastic composite film and aluminum composite film. At present, domestic testing methods for the water vapor transmission rate of soft plastic packaging include weighing (cup method), electrolysis, moisture method and infrared method. The reference standard is GB 1037-1988 "Plastic Film and Sheets. Test method for water vapor permeability of cups, GB/T "Test method for moisture permeability of packaging materials", GB/T "Determination of water vapor transmission rate of plastic films and sheets - Electrolytic sensor method" , GB/T "Determination of water vapor transmission rate of plastic films and sheets Humidity sensor method" (published, implemented on December 1, 2014).

3, test sample

A laminated aluminum composite film for biscuit packaging.

4, testing equipment

This article uses Labthink blue light W3/031 water vapor transmission rate tester to detect aluminum coated composite film samples for biscuit packaging.

4.1 Test principle

This equipment is designed using the weighing method test principle. During the test, the sample is clamped in a 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 passes through the sample from the high humidity side into the dry side. This causes a change in the weight of the 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 Application

l Film material: suitable for water vapor transmission rate 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, and waterproof breathable films. The test.

l Sheet: Test for water vapor transmission rate of sheet materials such as PP sheet, PVC sheet, PVDC sheet, nylon Sheets, etc.

l paper, cardboard categories: for paper, cardboard water vapor permeability test.

l Textiles, non-woven fabrics: Tests for the water vapor transmission rate of textiles, nonwovens, and other materials.

l Extensive application: The device can also be applied to the test of the water vapor transmission rate of liquid crystal display film, solar back sheet, sterile protective film, beauty mask, and protective clothing materials.

l The equipment meets many 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

l The test range of this equipment is 0.1 ~ 10000 g/m2Â·24h, and the test accuracy is 0.01 g/m2Â·24h.

l The equipment can achieve simultaneous testing of 3 samples, ie, 1 test can get 3 test results.

l The test temperature range of the equipment is 15 ~ 55Â°C, the temperature control accuracy is Â±0.1Â°C, the test humidity is 10%RH ~ 98%RH, and the humidity control accuracy is Â±1%RH.

l The standard purge wind speed can ensure that the humidity difference between the inside and outside of the moisture permeable cup is constant.

l Provide two kinds of quick calibration methods, standard film and standard weight, to ensure the accuracy and versatility of the test data.

l The wetted cup weighing method designed by the patented mechanical structure effectively ensures the accuracy and stability of the data.

l Support LystemTM laboratory data sharing system to easily achieve centralized and systematic management of laboratory test data.

l The calibration data recovery function effectively solves the adverse effects caused by misoperation, and ensures the safety of the system work as much as possible. The system can repair the key information data in the manner specified by the user, such as the calibration data recovery of each sensor. operating.

5, the test process

(1) Cut 3 specimens with a diameter of 74 mm from the sample surface of the aluminized composite film on the biscuit package using a cutter.

(2) Add a certain amount of distilled water to the three moisture-permeable cups, and attach the three samples to each of the three moisture-permeable cups.

(3) Open the test chamber door, place the three moisture-permeable cups with the test specimen on the water-permeable cup holder in the test chamber, and close the test chamber door.

(4) In the software system of the device, set the parameters such as sample thickness, sample temperature and humidity, and click the test option to start the test. The equipment automatically measures the weight of the moisture permeable cup at a set time interval. Based on the tested test data, the water vapor transmission rate and other test results of the sample are calculated and displayed.

6, test results

The test results of the water vapor transmission rate of the three samples of the coated aluminum coated composite film of the tested biscuits were 1.032 g/m2Â·24h, 1.061 g/m2Â·24h, and 1.027 g/m2Â·24h.

7. Conclusion

Among various performance indicators of biscuit packaging, water vapor transmission rate is one of the more important detection indicators. The value of this indicator will have a direct impact on the quality of biscuits during the shelf life. W3/031 Water Vapor Permeability Tester is a professional testing equipment for water vapor transmission rate testing of soft plastic packaging. The equipment is simple in operation, high in intelligence, high in test efficiency, and highly repeatable in test results. Accuracy, can truly reflect the sample's barrier to water vapor. Labthink has been dedicated to providing professional package inspection equipment and services to customers around the world. In addition to the water vapor transmission rate tester, Labthink also provides you with intelligent electronic tensile testing machines, thickness gauges, sealers, and oxygen transmission rates. Tester, friction coefficient meter, tear tester, heat seal tester, impact tester, carton compression tester and many other testing equipments, related equipment information, you can log in to view or directly to the consultation. The more you understand, the more you trust! Labthink is willing to take this opportunity to enhance technical exchanges and cooperation with enterprises and institutions in the industry.