Bowing phenomenon in double bubble tubular film processing for PA 6 / M. Takashige in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 1 (03/2004)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIX, N° 1 (03/2004) . - p. 56-63 Titre : Bowing phenomenon in double bubble tubular film processing for PA 6 Type de document : texte imprimé Auteurs : M. Takashige, Auteur ; T. Kanai, Auteur ; T. Yamada, Auteur Année de publication : 2004 Article en page(s) : p. 56-63 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Déformation de cintrage Films plastiques Polyamide 6 Index. décimale : 668.4 Plastiques, vinyles Résumé : This report is to discuss the bowing phenomenon and the sag elimination tension for biaxial oriented PA 6 film process, which consists of double bubble tubular film process and the thermosetting tentering. The bowing phenomenon does not occur in the heat set of the triple bubble tubular process. However, there is a serious problem of the bubble stability when the sufficient thermosetting by the tubular process is carried out, so the heat set by the tenter process is required. The bowing phenomenon arises when the annealing is carried out by the tenter method. The bowing distortion becomes large when the annealing temperature is high and film relaxation ratio is large. It is possible to reduce the bowing distortion when thermosetting is carried out in a two-step tenter process. The shrinkage stress of the stretched film was relaxed in the heat treatment during the second step whose temperature is higher than the first one. A two-step heat treatment was able to decrease the bowing distortion compared with the one-step heat treatment. When the bowing phenomenon occurred, shrinkage percentage in hot water changes along the cross-direction of a film. The humidity expansion coefficient in the film which increases as the increasing shrinkage percentage in hot water is related to the molecular orientation. The sag also increased with increasing the bowing distortion. The bowing distortion and the sag elimination of tension have proportional connection. DOI : 10.3139/217.1803 En ligne : https://drive.google.com/file/d/1xOhjAPXvNg6x_zSP6RM0Y3_KOwfO1Ufr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3296 [article]

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Easy tear film of biaxially oriented PA 6/MXD 6 blend by double bubble tubular film process / M. Takashige in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 2 (06/2004)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIX, N° 2 (06/2004) . - p. 147-154 Titre : Easy tear film of biaxially oriented PA 6/MXD 6 blend by double bubble tubular film process Type de document : texte imprimé Auteurs : M. Takashige, Auteur ; T. Yamada, Auteur ; T. Kanai, Auteur Année de publication : 2004 Article en page(s) : p. 147-154 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In the market, a film which adapted to environmental and barrier problems is desired. This report discusses the stretching stability and physical properties for biaxially oriented PA 6/ MXD 6 blending film produced by double bubble tubular film process. As MXD 6 blending ratio increased, the stretching stress decreased. Hydrogen bond is due to be suppressed by the steric hindrance of the MXD 6 resin. Blending film can be stretched stably and oxygen gas permeability is more excellent than PA 6. Further the film blended between 20% and 40% as MXD 6 blend ratio has the property of easy straight line cut. It is found that the plate-like cylinder structure was formed in the observation of TEM. However, thickness uniformity deteriorates when MXD 6 blending ratio exceeds 40 %. To improve the thickness uniformity, the influence of the kneading conditions was studied. When the melting point of MXD 6 decreased, the stretching stability deteriorated and mechanical properties drastically lowered. The excess reaction of the blending resins is not desirable. Stretchability, easy tear property and oxygen gas barrier property are maintained by following process conditions. In case of dry blending, MXD 6 30% is proper content. And in case of premixing, MXD 6 melting point keeps over 236 °C. It was confirmed that there is the condition satisfying all properties. The blending film keeps the compatible performance of strength and easy tear property. Namely, the material and production technology of a film could solve environmental and barrier free problems. DOI : 10.3139/217.1805 En ligne : https://drive.google.com/file/d/1rTarkjCJEsPsggLfNbVV8uhArqKA8AkU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3282 [article]

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Easy tear multilayer film of biaxially oriented PA6/MXD6 by double bubble tubular film process / M. Takashige in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 1 (03/2005)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 1 (03/2005) . - p. 100-104 Titre : Easy tear multilayer film of biaxially oriented PA6/MXD6 by double bubble tubular film process Type de document : texte imprimé Auteurs : M. Takashige, Auteur ; T. Kanai, Auteur Année de publication : 2005 Article en page(s) : p. 100-104 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In the market, a film which is adapted to environmental and barrier problems and easy tear property is desired. A previous report discussed easy tear PA6 film. This report discusses the film having not only easy tear, but also high barrier properties. A biaxially oriented PA6/MXD6 blend film produced by double bubble tubular film process does possess gas barrier. So a multilayer film having high gas barrier layer and keeping easy tear cut has been studied. High gas barrier layer of high content MXD 6 in the center layer is added to PA6/MXD6 blend film in the outer layers. When MXD6 blending ratio of PA6/MXD6 blending film layer is 30 %, the property of easy straight line cut is obtained. It is found that the plate-like cylinder structure was formed in the observation of TEM for PA6/MXD6 blend film. The multilayer biaxially oriented film composed of PA6/ MXD6 blend layer and MXD6 high content layer keeps high strength, easy tear property and high gas barrier. Namely, the material and production technology of a PA6 film could solve environmental and barrier problems. DOI : 10.3139/217.1868 En ligne : https://drive.google.com/file/d/1DwQO8vsF5lqCQjv3r2-mrxzIyNR6B9Ih/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3096 [article]

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Multilayer barrier film of biaxially oriented PA6/EVOH by double bubble tubular film process / M. Takashige in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 1 (03/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 1 (03/2006) . - p. 86-92 Titre : Multilayer barrier film of biaxially oriented PA6/EVOH by double bubble tubular film process Type de document : texte imprimé Auteurs : M. Takashige, Auteur ; T. Kanai, Auteur Année de publication : 2006 Article en page(s) : p. 86-92 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In the market, a film adapted to environmental and barrier problems is desired. The previous report discussed easy tear and gas barrier PA6 film. This report discusses the multilayer PA6 film having high barrier EVOH layer. A biaxially oriented PA6 film produced by double bubble tubular film process has high strength, but does not have enough gas barrier property compared with K-coated PA6. In the following a multilayer film with gas barrier layer is studied. A high gas barrier layer of EVOH is added to the center layer in the outer layers of PA6 films. The gas barrier ability increases with increasing the content of EVOH and decreasing ethylene content of EVOH, but at the same time the mechanical properties and processability get worse. From this point of view, it is found that the optimum content of EVOH is between 20% and 43 %. In a biaxially oriented multilayer film composed of PA6 layers and EVOH one keeps high strength and high gas barrier. The material and production technology of a PA6 film can solve environmental and barrier problems. DOI : 10.3139/217.0110 En ligne : https://drive.google.com/file/d/1l4ZPyZbO9ASMBuN-xqN5ksQ-8g6xkx3_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2933 [article]

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Scale-up rule for double bubble tubular process of PA6 film / M. Takashige in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 4 (12/2003)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVIII, N° 4 (12/2003) . - p. 368-375 Titre : Scale-up rule for double bubble tubular process of PA6 film Type de document : texte imprimé Auteurs : M. Takashige, Auteur ; T. Kanai, Auteur ; T. Yamada, Auteur Année de publication : 2003 Article en page(s) : p. 368-375 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The analysis of scale-up rule for double bubble tubular film process of PA6 was investigated. The scale-up rule previously proposed for a blown film process by the authors was applied to a double bubble tubular film process with a small-scale plant for research (pilot plant) and a large-scale plant for commercial production (production plant). According to the scale-up rule based on the equivalent stretching stress between the pilot and production plants, the equivalence of stretching stability, birefringence pattern and deformation pattern were confirmed. It has been confirmed that the proposed scale-up rule is applicable to predict the physical properties such as film impact strength and the bubble stability for the large-scale tubular film process on the basis of the experimental results obtained from the pilot plant. Note de contenu : EXPERIMENTAL : Equipments - Material - Experimental method - Evaluation od deformation bubble - Mechanical properties - RESULTS AND DISCUSSION : Stretching stress - Evaluation of deformation bubble - Birefringence - Observation of polarizing plates of deformed bubbles - Crystal structure - Film mechanical property DOI : 10.3139/217.1782 En ligne : https://drive.google.com/file/d/1xIR0elrAOSPET46RzXAC2J7R9msi41C7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15820 [article]

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Thickness uniformity of double bubble tubular film process for producing biaxially oriented PA 6 film / M. Takashige in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 1 (03/2004)  

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