Surface modification of bioriented polyethyleneterephthalate (BOPET) films for improved aluminiumadhesion used for retort applications
Başlık çevirisi mevcut değil.
- Tez No: 708516
- Danışmanlar: Belirtilmemiş.
- Tez Türü: Yüksek Lisans
- Konular: Endüstri ve Endüstri Mühendisliği, Endüstri Ürünleri Tasarımı, Mühendislik Bilimleri, Industrial and Industrial Engineering, Industrial Design, Engineering Sciences
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2019
- Dil: İngilizce
- Üniversite: Hochschule KonstanzTechnik Wirtschaft und Gestaltung
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 123
Özet
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Özet (Çeviri)
Biaxially oriented and metallised polyethylene terephthalate (boPET) films are widely used in the food packaging industry, mostly in laminates together with sealant films. In retort processes, heat treatment under certain conditions is applied to the already packaged good at high temperature and pressure in the presence of water vapour in the system. Also the metallisation layer providing barrier in such laminates has to withstand this procedure and must not be disintegrated. During this study, the effect of 18 different variants of surface treatment, respectively kinds of coating or different coating weights on 12 µm 3-layer coextruded boPET film and subsequent aluminium metallisation by physical vapour deposition on the bonding performance of the metallisation layer on the substrate/film system under steam sterilisation conditions is investigated. Electrical discharge corona treated boPET film is compared with copolyester, acrylic and urethane coatings on boPET films. Thickness, density, haze, gloss, coefficient of friction (COF), IR-ATR and DSC of transparent not yet metallised film samples were documented, IR-ATR and DSC analysis not giving specific information related to the coatings, because of their extremely low coating weights. The transparent film samples were metallised targeting a typical optical density OD of 2.01 - 2.50, which correlates to a metal thickness of 13.2 - 19.0 nm. The metallisation layers of all differently treated or coated films did not exhibit metal pick-off in a tape test, meaning that always an adequate bonding strength between film and metal layer was achieved. The metallised films were put in a steam steriliser unit at 134 °C for 4 minutes. Both, visual inspection and optical density measurement, showed that the aluminium metallisation layer on boPET film disintegrates to a large extent. This effect is also verified by comparing oxygen and water vapour transmission rate on specified metallised samples before and after steam sterilisation. Primer coatings do not protect the aluminium layer from top but prime from underneath. To eliminate the effect of direct exposure to steam, the metallised layer of the films is laminated with boPP film by a polyurethane adhesive. The OD values after sterilisation of metallisation layers in laminated film improved on average by a factor of 36.5 in comparison with non-laminated samples. The study showed that metal adhesion tests of the non-laminated metallised films and oxygen and water vapour barrier measurement of the non-laminated structure after sterilisation were the best approach to compare the performance of the different systems. Particularly, a urethane coating of 0.185 g/m² dry coating weight on boPET showed the highest metal adhesion strength of 7.0 N/15mm, while higher and lower polyurethane coating weight samples showed significantly lower metal adhesion strength, but better than acrylic and copolyester.
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