In tensile tests, samples treat-ed with UV-irradiation heat treatment were compared with untreated sam-ples to evaluate their strip strength. The results showed that the stimulated foaming type polymer exhibited signif-icant foaming in the adhesive, which significantly reduced the peel strength. This study suggests the possibility of recycling for multilayer films using stimulated foaming type polymers.viscoelastic properties (loss factor: tanδ) of acoustic properties for materi-al identification of polymeric materials. PET, OPP, LLDPE and EVA were se-lected as samples and the character-istics of these materials were evaluat-ed. Accelerometers were used for the evaluation. The sample was vibrated and the response was measured. The data obtained were recorded as wave-form data for analysis, and viscoelas-ticity measurements were made using a dynamic viscoelasticity measuring device. By observing the response vi-bration of the samples at different fre-quencies, differences between sample materials were identified, suggesting that this property is often similar to the storage modulus obtained from viscoelasticity measurements. They concluded that this could be useful for material identification of polymeric ma-terials used in packaging materials.PE Pouches: A sustainable alternative to traditional flexible packagingThe body film of the refill pouches must be cosmetically pleasing, suit-able for multi-color printing, and heat resistant to enable the heat sealing process. Therefore, different PE films were used to verify the optimal one. Fujimori Kogyo Hiroshi Kuwabara of Fujimori Kogyo presented pouches made from a single material that is easily recyclable. Tra-ditionally, flexible packaging materials such as reusable pouches have been made from a combination of materials such as PET, polyamide (PA) and PE to achieve superior functionality. Howev-er, the use of a single material, PE, has presented a particularly difficult chal-lenge because of the need to maintain its quality.For multi-color printability, uniaxially oriented HDPE was superior due to the fact that uniaxial orientation stretches the film strongly in the direction of flow and it is HDPE, which is the stiffest of the PEs. Uniaxially oriented HDPE was also superior in melting point and moisture vapor barrier properties.In the development of the bottom film, it was found that the use of uni-axial oriented HDPE, which is used as the printing base material for the body film, caused many breakages in the bag drop test. It was speculated that this was due to the fact that uniaxially oriented HDPE is weak against verti-cal forces, causing the film to tear. To solve this problem, we switched from uniaxially oriented HDPE to non-ori-ented HDPE, which greatly improved the pouch’s drop resistance.In addition, products such as sham-poos and conditioners, which contain many fragrance ingredients, require fragrance to be retained by a barrier layer. PE has a high oxygen permea-bility, and fragrance ingredients easily permeate through it, but by adopting a design that provides fragrance reten-tion within the layer, the oxygen barrier property was improved.After various studies, a pouch was made from the developed film and the physical properties and productivity were verified. The refill pouch require-ments were met and a single-material refill pouch was successfully realized.Shuji Kobayashi, a graduate student at Yamagata University, presented on the recycling of multilayer films and the effect of adding a double-stimu-lated foaming polymer to film adhe-sives on foaming performance and tape strength. The background of this research is the need for a “peelable adhesive technology” with adhesive properties and easy peelability, as mul-tilayer films made of different materials are difficult to separate and difficult to recycle as materials. In this study, we focused on a dual-stimulus foaming polymer film adhesive that foams upon two stimuli: UV irradiation and heating. This adhesive has the property that it does not foam when only one stimu-lus is applied, but degrades when both stimuli are applied.In the study, poly(p-tert-butoxy-styrene) was used as the main foam-ing agent and the photoacid generator CPI-410s was used as the foaming initiator. OPET 25 μm was used as the substrate, polyester polyol as the main adhesive, and polyisocyanate as the adhesive curing agent. A two-part ure-thane adhesive was used for sample preparation. The main foaming agent and the foaming initiator were mixed in ethyl acetate solvent, applied to PET film, and crimped to produce two types of three-layer films.technology 8Yamagata University Graduate School, Osaka Public University Graduate School, Kanazawa University Graduate SchoolPoster SessionRecycling technology of multilayer film by controlling adhesive interface using stimulated foam type polymer
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