Moisture-proof Package

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Moisture proof package is a most commonly used protection against moisture during logistics procedure, which avoids rusts and deterioration of the packed contents effectively and is widely used in machinery, electronics, foodstuff, medicine and daily care, etc. In order to guarantee moisture proof bag quality, relevant tests for this kind of package is a necessity. Relevant standards on moisture proof packages, such as GB/T 5048-1999, details on the gradation of moisture proof bags and relevant testing methods as follows:

1. The Moisture Vapour Transmission Testing for Moisture Proof Package

Moisture proof packages are tested according to cup method in the standards. Cup method is another name for weighing method when testing moisture. Its principle is to test the weight differences of the cup within a unit time so as to get the parameters such as moisture transmission quantity, etc. Hereinafter, we take Labthink TSY-T series of testers as example. This series has four testers, all of which are of weighing method.

The traditional testing method is to utilize cup, constant temperature chamber and scale to measure manually. However, owing to the human interferences, there would be a great influence on testing results, such as long testing duration and low accuracy. Labthink W3 series of moisture transmission testers are of the innovative fully automotive testing mode and comply with testing requirements as well as standards. The only thing the operator needs to do is to place the pre-conditioned specimen into the cup and start the tester. Then, the tester operates, judges, ends and prints the testing results automatically. The whole process is intellectual with no human interferences and thus, brings forward accurate and reliable testing results.

In production, the packaging material must undergo procedures such as forming, inserting and heat seal, etc; uneven thickness and inferior sealing sometimes occur. This requires testing for packaging materials as well as the whole moisture proof package. Labthink PERME W3/330 Moisture Transmission Testing System successfully meets the double testing need. This testing system is of master-satellite mode, a master base can connect 9 satellite testers so as to realize 30 kinds of materials testing at the same time.

2. Heat Seal Strength Testing for Moisture-proof
The heat seal strength of the moisture proof packages should be no less than 30N/5cm according to standards.

Labthink HST-H3 Heat Seal Tester is for the specimen preparation of the heat seal testing procedures; and Labthink XLW series tensile testers are specialized in the heat seal strength testing for moisture proof packages. A full automatic test can be accomplished only by pressing the button ‘Heat Seal Strength’. Besides, this tester can test the elongation, peeling strength, tearing strength and puncture of the laminated layers of moisture proof package.

3. The Seal Performance Testing of Moisture-proof Packages

The seal performance testing of moisture-proof package can be accomplished with Labthink MFY-01 Leak Tester. Through testing, pinhole, crack, inferior seal and other defects can be observed.

Place moisture proof package into the vacuum chamber filled with water, set the vacuum maintaining time between 30 to 60 seconds. The vacuum rate is set as one of the following: 20, 30, 50 or 90kPa. Then start testing to achieve preset vacuum rate and maintain vacuum time. Observe the leakage during vacuuming and vacuum maintaining periods to observe bubbles. Yet a single separated bubble can not be regarded as an indication of specimen leakage.

About Labthink:

Labthink, the excellent provider of testing instruments and testing services, is devoted to provide most excellent and complete quality control solutions for pharmaceutical, foodstuff, cosmetics, packaging, printing, adhesive, automotive, petrochemistry, environment, biology, new energy, construction, aviation and electronic industries worldwide.