Paying attention to layers in-between / Fiorenzo Parrinello in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 7 (2020)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 7 (2020) . - p. 37-42 Titre : Paying attention to layers in-between : Continuous compression molding multilayer of coffee capsules Type de document : texte imprimé Auteurs : Fiorenzo Parrinello, Auteur ; Fabrizio Pucci, Auteur ; Cristian Spadoni, Auteur ; Giovanni Mazzotti, Auteur Année de publication : 2020 Article en page(s) : p. 37-42 Langues : Anglais (eng) Catégories : Aliments -- Emballages Café -- Emballages Capsules Copolymère éthylène alcool de vinyle C'est aujourd'hui le matériau le plus utilisé dans l'emballage rigide alimentaire. Il peut être utilisé avec des matériaux de structure comme le polyéthylène, polypropylène ou polystyrène. Ce copolymère présente une excellente imperméabilité à l'oxygène, au gaz carbonique et aux arômes, à condition de protéger de l'influence de l'humidité qui fait chuter fortement ses performances. Pour palier cet inconvénient, il est souvent pris en sandwich dans des structures multicouches à base de polyoléfines PE ou PP peu sensibles à l'humidité. Il est utilisé pour les emballages de compotes, jus de fruits, fromages, sauces, crèmes et yaourts, mayonnaise, sauce tomate... Emballages en matières plastiques Matières plastiques -- Moulage par compression Polypropylène Structures multicouches Index. décimale : 668.4 Plastiques, vinyles Résumé : Continuous Compression Molding (CCM) technology can be applied to multilayer solutions and is referred to as Continuous Compression Molding Multilayer (CCMM). In addition to the usual benefits of CCM it offers further advantages over competing technologies. In packaging applications, compression technology makes it possible to use minimal quantities of barrier material, thus combining excellent performance with low raw ‧material costs. Note de contenu : - Role of compatibilizers - Processing technologies - Quality control - Figure : EVOH distribution in a compression-molded multilayer capsule produced by CCMM : 1) complete distribution over cross-sectioned capsule, 2) enlargement of two zones (bottom and wall) of the capsule - Fig. 1 : Cross-section of multilayer melt co-ex-trusion forming head - Fig. 2 : Cross-section of a portion of multilayer melt exiting the extrusion nozzle. The light blue area is the colored polypropylene (PP) while the black line is the EVOH (oxidized with iodine to make it clearly visible). Being transparent, the compatibilizer is somewhat hard to distinguish - Fig. 3 : Multilayer melt (bottom right) exiting the extrusion nozzle - Fig. 4 : The cutting and conveying of the desired melt doses is an essential stage of the entire process - Fig. 5 : Close-up of the multilayer dose cutting and conveying system mechanism that rotates 90° just before it reaches the mold - Fig. 6 : The capsule is extracted from the mold - Fig. 7 : Computer simulation showing the distribution of five layers of material during coffee capsule compression molding. For purposes of clarity, only half of the actual EVOH layer is shown (in red) - Fig. 8 : Distribution of EVOH in a multilayer capsule molded by co-injection: 1) possible effect of layer delamination, 2) and 3) possible voids or incompleteness of EVOH layer - Fig. 9 : Continuous analysis of all manufactured capsules with two different control systems - Fig. 10 : Oxygen transmission rates in capsules molded with two different grades of barrier material over time - Table 1 : Melt mass flow rate (MFR) and oxygen transport rate (OTR) of selected commercial EVOH as a function of ethylene content, measured on a 20 μm thick film - Table 2 : Main characteristics of the barrier layer obtained in packaging molded by compression, co-injection and thermoforming - Table 3 : Comparison between quantities of compatibilizer typically used in different molding techniques - Table 4 : Cost of 1 million capsules according to the packaging composition - Table 5 : Oxygen transmission rates measured on CCMM-made capsules with a surface area of 2480 mm2 (measured at 25 °C and 35 % relative humidity, pkg for single package) - Table 6 : Oxygen transmission rates measured on CCMM-made capsules with a surface area of 3135 mm2 (measured at 21 °C and 40 % relative humidity, pkg for single package) En ligne : https://drive.google.com/file/d/1d6N0MqbH4zcon0YsIp3UySt1F6uatOe5/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34816 [article]

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