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Barrier Properties Study of Thin Films with Different Thickness

Barrier Properties Study of Thin Films with Different Thickness
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Barrier Properties Study of Thin Films with Different Thickness - 1

Barrier Properties Study of Thin Films with Different Thickness Abstract Basically, increasing the thickness of film materials is one of the important measures to improve the barrier properties of packages. Meanwhile, the increase of materials thickness is bound to increase packaging costs. This article studied the influence of increasing the thickness of single layer membrane in composite materials on the barrier properties of packages, through test the oxygen permeation of film materials with different thickness. Keywords Film materials, thickness, barrier properties, oxygen transmission rate, oxygen permeation, oxygen permeability, gas permeability tester, composite materials Barrier performance is one of the basic properties of packaging materials to protect the content products. The barrier properties of packaging materials are related to materials structure, thickness, and etc. For the same film materials, when the thickness is increased， the barrier properties are improved. The composite materials are most used for plastic packaging. By combining different types of single-layer films, the composite materials can make full use of the advantage of different materials to meet the packaging requirements. Since they play different roles in packaging structure, the influence of increasing thickness of different layers is also different on improving the packaging permeability. Therefore, blindly increasing the thickness of the packaging material may not achieve the expected barrier properties, but seriously increase the costs. In this paper, we tested the oxygen permeability of films materials with different thickness, and then analysis the influence of increasing the thickness of different layers on the barrier properties of packages. We used PET(12µm)/PE(45µm) 、 PET(12µm)/PE(60µm) 、 PET(25µm)/PE(45µm) with different thickness as specimens for this study, and tested their oxygen transmission rate. We used differential pressure method to test according to ASTM D1434 – Standard Test Method for Determining Gas Permeability Characteristics of Plastic Film and Sheeting. The equipment used is VAC-V2 Gas Permeability Tester, provided by Labthink Instrument

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Barrier Properties Study of Thin Films with Different Thickness - 2

C-V2 Gas Pe ermeability Tester T VAC principle, the oxygen tran nsmission rat is the quan te ntity of oxyg passing t gen through a un of nit In p plastic film in un time unde stated temp nit er mperature and gas pressure on both sid of the film d e des ms. 1) Use the sampler to cut a samp specime with a diameter of 9 e o mple en 97mm from each specime en 2) The equ uipment we use has thre test cells, which can test these thr specimens at ee t hree the sam time. App a light c me ply coating of vacuum greas on the fla metal tha the v se at at surface of the specim will con men ntact. Avoid...

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Barrier Properties Study of Thin Films with Different Thickness - 3

parameters in the software, turn on the vacuum pump and click the Start Test option to start the test. The equipment is tested according to the set parameters and the test results are displayed after the end of the test. The results of these three specimens are shown as below: Conclusion Compared with Specimen #1, the oxygen transmission rate of specimen #2& 3 both decreased because of the thickness increase of PET or PE. The OTR of specimen #2 reduced by 18.891 cm3/(m2-24h-0.1MPa) with a 15pm increase in the thickness of PE layer, while the OTR of specimen #3 reduced by 60.680...

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