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Auteur T. Yamada |
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Bowing phenomenon in double bubble tubular film processing for PA 6 / M. Takashige in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 1 (03/2004)
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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 6Index. 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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3296
in INTERNATIONAL POLYMER PROCESSING > Vol. XIX, N° 1 (03/2004) . - p. 56-63[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001027 - Périodique Bibliothèque principale Documentaires Disponible Deformation behavior, processability and physical properties for biaxially oriented film of LLDPE / H. Uehara in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 2 (06/2004)
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Titre : Deformation behavior, processability and physical properties for biaxially oriented film of LLDPE Type de document : texte imprimé Auteurs : H. Uehara, Auteur ; T. Yamada, Auteur ; T. Kanai, Auteur ; K. Sakauchi, Auteur Année de publication : 2004 Article en page(s) : p. 155-162 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The bubble deformation behavior of double bubble tubular film (DBTF) of linear low density polyethylene (LLDPE) is experimentally analyzed. Also investigated is how the bubble deformation behavior of the stretched films are changed by stretching conditions, especially stretching temperature, and how the properties of stretched films are influenced by stretching conditions. From the results, the optimum conditions required to obtain a stable bubble and good properties for the DBTF of LLDPE are indicated. The relationship between the DBTF and laboratory tenter stretched film (LTSF) is investigated in order to predict the processability and the properties of the DBTF by using the laboratory tenter biaxial stretcher. This method is not only more time efficient, but also reduces overall costs of developing the DBTF. DOI : 10.3139/217.1813 En ligne : https://drive.google.com/file/d/1ZK5g0EziI1rPZeJuNj0GryZ2BTwxG5Pd/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3283
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Code-barres Cote Support Localisation Section Disponibilité 001028 - Périodique Bibliothèque principale Documentaires Disponible 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)
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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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3282
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Code-barres Cote Support Localisation Section Disponibilité 001028 - Périodique Bibliothèque principale Documentaires Disponible Moisturizing mechanism of glycerol and diglycerol on human stratum corneum studied by synchrotron X-ray diffraction / T. Yamada in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 43, N° 1 (02/2021)
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Titre : Moisturizing mechanism of glycerol and diglycerol on human stratum corneum studied by synchrotron X-ray diffraction Type de document : document électronique Auteurs : T. Yamada, Auteur ; A. Habuka, Auteur ; I. Hatta, Auteur Année de publication : 2021 Article en page(s) : p. 38-47 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : Polyols are moisturizers used in cosmetics. Using X-ray diffraction, we studied the moisturizingmechanism of polyol solutions in the stratum corneum (SC). We examined whether glycerol disrupts the ordered hydrocarbon chain packing structure in isolated SC, as previously proposed in an SC lipid model.
- Methods : The SC samples were prepared by treatment with water and aqueous solutions of glycerol, diglycerol and glycerol/diglycerol. To examine the differences in the water-retention efficiency of polyols, using a solution cell, we performed dynamic X-ray diffraction to analyse the structural changes that occurred during water removal from the hydrated samples by a stream of dry nitrogen gas. We focused on two structures, the orthorhombic hydrocarbon chain packing structure in the intercellular lipids and the soft keratin in the corneocytes where most of the water is stored.
- Results : The spacing formed by the soft keratin in the corneocytes immersed in a solution of water and diglycerol solution decreased rapidly by water removal. In contrast, it decreased gradually in the corneocytes immersed in a solution of glycerol and glycerol/diglycerol, indicating that the glycerol-containing solutions maintained the hydrated state of the corneocytes for longer. Furthermore, the characteristic change of the spacing in the orthorhombic hydrocarbon chain packing structure over time was observed during the drying process. The hydrated state was maintained longer, in water, followed by glycerol, diglycerol and glycerol/diglycerol, in increasing order. This is the first study to report such characteristic properties that could be indicators of the capacity of the SC to regulate water.
- Conclusion : The dynamic X-ray diffraction experiment on the structure of the soft keratin and the orthorhombic hydrocarbon chain packing structure during the drying of the hydrated SC provides an insight into the moisturizing mechanism of the polyol solutions in the SC. The results show that the glycerol/diglycerol solution functions as an effective SC moisturizer at the molecular level. Further, it was confirmed that the behaviour of glycerol in the isolated SC varies from that proposed in the SC lipid model, wherein glycerol was proposed to prevent the formation of a regular hydrocarbon chain packing structure.DOI : https://doi.org/10.1111/ics.12664 En ligne : https://drive.google.com/file/d/1HFRUIow0r86bjg_7YILKigsz8bRNVZy5/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35442
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 43, N° 1 (02/2021) . - p. 38-47[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Scale-up rule for double bubble tubular process of PA6 film / M. Takashige in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 4 (12/2003)
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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 propertyDOI : 10.3139/217.1782 En ligne : https://drive.google.com/file/d/1xIR0elrAOSPET46RzXAC2J7R9msi41C7/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15820
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Code-barres Cote Support Localisation Section Disponibilité 001026 - Périodique Bibliothèque principale Documentaires Disponible Stretchability and properties of biaxially oriented polypropylene film / T. Kanai in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 5 (11/2006)
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PermalinkStretchability and properties of LLDPE blends for biaxially oriented film / H. Uehara in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 2 (06/2004)
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PermalinkStretchability and properties of various LLDPE for biaxially oriented film / H. Uehara in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 2 (06/2004)
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PermalinkThickness 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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PermalinkVisualization analysis of a multilayer foam development process in microcellular injection molding / T. Yamada in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)
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