be produced on a general purpose 3-layer molding machine and that the new sEVA1 has superior recyclability compared to PE-g-MAH.Acetylcellulose/silica hybrid organic-inorganic gas barrier filmIn the study, a solution of 1,4-di-oxane (DX) and AC (55% acetyl group content) was prepared, distilled water and nitric acid were added as cata-lysts, and a mixed solution of tetrame-thoxysilane (TMOS) and 3-glycidoxy-propyltrimethoxysilane (GPTMOS) was added to prepare a sol. Citric acid (CA) was added as a cross-linking agent, and the oxygen and moisture perme-ability of the membranes were mea-sured after the sol was applied to sub-strates such as PP and PET and baked for 12 hours.Membranes were prepared by fix-ing the amount of AC added at 70 wt% of the total weight of silicon alkoxide, the molar ratio of TMOS to GPTMOS at 0.90:0.10, and the molar ratio of water to nitric acid at 4:0.01, and vary-ing the CA from 0 to 120 wt% of the total amount of AC added. The mem-brane with the best water vapor barri-er property was the one with 100 wt% CA (i.e, the same amount of CA as the amount of AC added), with a moisture permeability of 10.3 g/m2/day (about 2.3 times that of the base PET) and an oxygen transmission coefficient of Kobe University Graduate SchoolYuiko Koga of the Graduate School of Kobe University has developed an organic-inorganic hybrid gas barrier membrane with excellent oxygen and water vapor barrier properties and bio-degradability by introducing silica into acetyl cellulose (AC) and using a sol-gel method.1.1×10-18mol•m/(m2•s•Pa) (about 1.3×103 times that of the base PP and 9.1 times that of PET). On the other hand, the wa-ter vapor barrier property decreased as the amount of CA added increased more than the amount of AC added.Koga attributed the improved wa-ter vapor barrier property of the mem-branes to the ester bond between the carboxy groups derived from citric acid of the crosslinking agent and the hydroxy groups derived from AC, as well as the ring-opening condensation of a small amount of epoxy groups de-rived from GPTMOS in the silica back-bone by the carboxy groups of citric acid. On the other hand, when more CA than AC was added, we attribut-ed the decrease in water vapor barrier properties to the increase in hydrophil-ic carboxyl groups that were not used for crosslinking.Adaptive MA PackagingChiba University Graduate School / Mitsubishi Gas ChemicalTakeo Shiina of Chiba University’s Graduate School of Horticulture has developed a new Modified Atmo-sphere Packaging (MAP), the Adaptive MA Packaging System (AMS). Active MAP（AMAP） is a type of MAP that controls the gas composition to be dif-ferent from the atmospheric composi-tion from the beginning of packaging, for example, by injecting nitrogen gas to reduce the oxygen concentration before packaging, while Passive MAP (PMAP) is a type of MAP that controls the gas composition to be different from the atmospheric composition from the beginning of packaging, for example, by injecting nitrogen gas to reduce the oxygen concentration. is a type that creates a gas composition environment suitable for quality pres-ervation in the package by consuming oxygen and producing carbon dioxide through fruit and vegetable respiration and gas transfer through the packag-ing material.Two new design elements of AMS include: first, while conventional PMAP relies on the gas permeability of the plastic film and the interdiffusion of gases through the micropores, AMS introduces another gas transfer meth-od in addition to this to regulate the gas composition within the package. Another is that while gas displacement was the primary method of gas com-position modification in AMAP, AMS uses materials that promote gas ab-sorption and release for more efficient gas control.AMS also includes a device called a gas transfer accelerator device that can be added to the packaging mate-rial to adjust the required gas transfer rate and volume based on the type of product, package size, and distribu-tion temperature. An MA agent is also included in the MA package, which can control a wide range of gas com-positions by utilizing carbon dioxide absorption and release in addition to normal oxygen removal.Shiina said that by using AMS, appropriate MAP conditions can be maintained when packaging products under different conditions. This is the first report on this research, and the company plans to report on specific methods, examples, and results of gas transfer control in the future.Viscoelasticity measurement of packaging plasticsHyogo Prefectural Institute of TechnologyMitsuya Saeki of the Hyogo Prefec-tural Industrial Technology Center in-vestigated the possibility of using the 7
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