Vacuum-aluminized film resistance to koji resistance

 

The vacuum aluminized film is a representative product of the current vapor-deposited composite film, which melts and evaporates the aluminum wire under high vacuum conditions by high temperature , and the aluminum vapor precipitates and accumulates on the surface of the plastic film to form a barrier layer with a thickness of about 35 to 40 nm . as a plastic film substrate may be PE, PP, PET, PA, PVC and the like. Vacuum aluminum excellent in barrier properties, transparency is not required in the case of packaging, vacuum aluminum is an excellent choice, and aluminized good aroma retention, having a metallic luster and decorative appearance, but because by aluminum Due to the ductility of the metal and the limitation of the aluminizing technology, the aluminized layer is liable to cause pinholes or cracks after being subjected to Qufu and bismuth, thereby affecting the oxygen barrier property and the moisture barrier property of the vacuum aluminized package.

ASTM F392 is a method standard for detecting the resistance of tamping and koji to soft packaging materials. This test can simulate the behaviors of koji, 揉搓, and folding in the production, processing and transportation of films. Judging the anti-caries performance of the material by detecting the change in the number of pinholes or the change in barrier properties before and after the test, it can provide a quantitative basis for the practical application of packaging design and materials.

1 , ASTM F392 test method introduction

     First, according to the standard requirements, a certain number of samples meeting the test requirements are prepared, and the number of pinholes, barrier properties, or other parameter indicators of the untested materials are detected. The sample is pretreated for a period of time according to the standard requirements and the test environment conditions are selected (usually 23 °C , 50 % RH ) and test mode (the standard provides 5 test modes A , B , C , D , E ) to start the test.

The anti-caries performance of the sample can be judged by the following two methods: *, measuring the number of pinholes formed during the crucible with dyed turpentine; second, the permeability or moisture permeability of the comparative sample before and after the test. The pinholes formed in the sputum test can only be measured by dyeing turpentine. However, if only one of the multilayer composites is broken, or if some plastic film is difficult to form pinholes in the sputum test, the anti-crack properties of these materials The determination needs to be done through professional barrier testing equipment. A variety of test modes are set to allow the number of pinholes or barrier properties of the sample to be formed in the helium test to be within a reasonable test range. The average of the measurements of multiple samples should be taken when evaluating the resistance of the material to avoid the effects of accidental factors in the test.

2. Detection application

     Recently, LABTHINK Languang Lab utilizes Labthink   FDT-01 揉搓 tester, T3 moisture permeability tester according to ASTM F392 vacuum impregnation PET ( VMPET , 12μm ), PET ( 20μm ), PE / EVOH / PE ( 76μm ) three materials anti-caries performance comparison. Three modes of B , C , and D were used in the sputum test, and the effect of detecting the moisture permeability of the sample was determined (no physical holes were formed). The test data for this comparison is as follows:

揉搓 test data sheet

Note: 1. The WVTR unit is: g/m ² ·24h .

2. Test the average.

The moisture permeability of vacuum aluminum-plated PET ( VMPET , 12μm ), PET ( 20μm ), PE/EVOH/PE ( 76μm ) is in the range of medium and high barrier properties, but their anti-caries performance is quite different. Among them, the good anti-cracking property is PE/EVOH/PE ( 76μm ), and the moisture permeability is consistent in this test. Followed by PET ( 20μm ), the material can maintain the initial moisture permeability of the zui at a lower number of times, but the moisture permeability also increases significantly when the number of times is increased to 900 times. The recognized high-barrier material vacuum-aluminized PET ( VMPET , 12μm ) has poor anti- caries performance, and even if only a few times, the moisture permeability is increased by more than 10 times.

3 . to sum up

The anti-caries properties of the material will affect the stability of the barrier properties of the packaging material throughout the circulation process. If the barrier properties of the material barrier layer are poor due to poor resistance to warpage or tamper resistance, resulting in product deterioration, then for the packaging manufacturer. And the loss of the product manufacturer is huge. Although the aluminum-plastic composite packaging has excellent mechanical properties and barrier properties, it has many disadvantages in terms of its resistance to tampering and resistance to koji. However, vacuum aluminum-plated materials, which are regarded as substitutes for aluminum foil, have been used in folding resistance and toughness. Great improvement, however, from the comparison data of this test, the aluminized material still has different anti-caries performance compared with other high-polymer materials, so to ensure its comprehensive performance after the Qufu The packaging of the product is safe and it is an indispensable means to detect the resistance to koji.

   

Jinan Languang Electromechanical Technology Co., Ltd. Guangzhou Representative Office

                         Liu Jun ,       

 

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