Effects of flexing, optical density, and lamination on barrier and mechanical properties of metallized films and aluminum foil centered laminates prepared with polyethylene terephthalate and linear low density polyethylene

Abstract

Flex barrier and optical density (OD) are two unique properties for metallized films and aluminum foil. This study investigated the effect of flexing on barrier properties of a laminate comprising metallized films and aluminum foil, as well as OD and adhesive lamination process on the overall multilayer laminate performance. Three (3) barrier layers, namely aluminum foil, metallized polyethylene terephthalate (met OPET) film with a high OD, and standard metallized PET film(met OPET), were laminated with the same printing layer OPET and sealing layer linear low density polyethylene (LLDPE), into OPET/adhesive/foil/adhesive/LLDPE and OPET/adhesive/met OPET/adhesive/LLDPE structures. The oxygen transmission rate (OTR) and water vapor transmission rate (WVTR) were measured before and after flexing. The aluminum foil centered laminate had an excellent oxygen barrier after the 20-cycle flexing test and failed to retain its oxygen barrier after the 270-cycle flexing. Compared to the aluminum foil centered laminate, the metallized film centered laminates were less affected by the flexing on the oxygen barrier. For all laminates, the water vapor barrier was less severely affected by flexing than the oxygen barrier. This study suggests that the ASTMF392 Gelbo D (20- cycle flexing) can determine if aluminum foil and metallized film centered laminates are resistant to flex-formed pinhole failures. A higher OD, a thicker film thickness and lamination process improved laminate’s actual barrier, resulting in lower measured transmission rates versus that predicted using Henry's solubility law and Fick's diffusion law. The laminate’s water vapor transmission rate is 55–74% lower than predicted. The oxygen transmission rate is 15–31% lower than predicted.

Lamination Effect on Al-Mn Alloy During Can Forming

“…It is easier to form porosity in the casting of 3104 aluminum alloy. In continuous casting, due to the large temperature gradient and solidification speed, it is easy to appear component supercooling to promote the growth of dendrites, which is more conducive to the formation of air hole porosity [6][7][8]. In conclusion, optimizing the casting process is a feasible method to reduce air-hole porosity.…”

Curcumin‐containing microencapsulated antioxidant composite paper for cake preservation

“…Currently reported barrier properties of petroleum and bio‐based paper coatings for food packaging are shown in Fig. 5 (Lange & Wyser, 2003; Marvdashti et al., 2017; Ge et al., 2020; Tyagi et al., 2021). The barrier properties of the packaging we studied are to some extent better than those of polystyrene, polyethylene and other materials.…”

“…Barrier properties of petroleum and bio‐based paper coatings for food packaging on the market (Lange & Wyser, 2003; Marvdashti et al., 2017; Ge et al., 2020; Tyagi et al., 2021). …”

“…Figure 5 Barrier properties of petroleum and bio-based paper coatings for food packaging on the market (Lange & Wyser, 2003;Marvdashti et al, 2017;Ge et al, 2020;Tyagi et al, 2021). 25 °C, the POV of fresh cakes after treatment tends to increase, reaching a maximum on day 6 and then decreasing.…”

Influence of Packaging Process on Mechanical Characteristics of the Flexible Packaging Materials

“…Recent research in [11] investigated the effect of flexing on the barrier properties of a laminate comprising metalized films and aluminum foil.…”