Experimental analysis for extrusion screw geometry to produce highly transparent polypropylene sheets

Funaki, Akira; Takubo, Toyokazu; Kanai, Toshitaka

doi:10.1002/pen.21459

Cited by 13 publications

(2 citation statements)

References 13 publications

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“…The quality of rubber product has caused more and more attention, and so the research on thermal deformation of barrel has become a hot-point project. According to research indicated that the asymmetry of temperature contributes increasing in grid of temperature and thermal stress easily, that engender thermal deformation in barrel of big extruder [2][3][4]. In big extruder SJ150×25, this phenomenon not only increase error of coaxial degree between screw and barrels, but also aggravate the screw often rubs against barrel.…”

Section: Introductionmentioning

confidence: 99%

Optimization Design for Cooling Channel of the Single Screw Extruder Barrel

Tang

2014

AMM

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To solve the issue of machine barrel skewed to one side, when the XJ150×25 was running. Under the conditions that the needs of strength was met, by designed three types of cooling channels and analyzed the temperature field for the barrel by using ANSYS, as well as thermal deformation. The results show that cooling channel of center symmetric form can solve the problem that uneven temperature field causing the barrel to produce thermal deformation. It can guarantee the coaxial degree between screw and barrels and can improve the quality of products.

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Section: Introductionmentioning

confidence: 99%

Optimization Design for Cooling Channel of the Single Screw Extruder Barrel

Tang

2014

AMM

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“…In our previous article, we experimentally conducted the extrusion tests by using many screws with various geometries to obtain a highly transparent PP melt resin sheet before its solidification [50]. The transparency of melted resin sheet was obtained by the screw geometry so that the specific energy consumption was small and the melted temperature was low.…”

Section: Introductionmentioning

confidence: 99%

Analysis of contributing factors to production of highly transparent isotactic polypropylene extrusion sheets. Part I

Funaki¹,

Kanai²,

Saito³

et al. 2010

Polymer Engineering & Sci

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To obtain highly transparent isotactic polypropylene sheet by an industrial process, various factors contributing to transparency were analyzed. Two kinds of sheets were prepared for analysis. The one was extruded by a direct single belt process as the quick quenching system. And the other was extruded by a conventional air knife process as the slow cooling system. The higher order structure of each sample sheet was investigated by phase‐contrast microscopy, polarizing microscopy, light scattering, wide‐angle X‐ray diffraction (WAXD), small angle X‐ray scattering (SAXS), and transmission electron microscope (TEM). In the case of the quick quenching sheet, many spherical substances were generated near sheet surfaces. Comparing with static cooling experiments, it was thought that the main cause was the orientation crystallization by the residual stress. The spherical substances in a phase‐contrast micrograph were extremely coincident with the maltese cross pattern in a polarizing micrograph. Other analysis results also showed that these spherical substances were spherulites. And after the heat treatment, the matrix was transformed from smectic structure to α‐monoclinic crystal phase. The density and refractive index differences between spherulite and matrix were decreased, and the transparency was drastically improved. In addition, some guideline for the improvement of transparency was indicated. POLYM. ENG. SCI., 2010. © 2010 Society of Plastics Engineers

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Analysis of contributing factors to production of highly transparent isotactic polypropylene extrusion sheets. Part 2

Funaki

Kondo

Kanai

2011

Polymer Engineering & Sci

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To obtain highly transparent isotactic polypropylene (PP) sheet by an industrial process, the influences of the isotacticity and metallocene linear low‐density polyethylene (L‐LDPE) as crystallization control material were analyzed. The sheet samples were extruded by using a direct single‐belt process. Even if the sheeting was carried out under the same conditions, the lower tacticity PP generated the less and the smaller size of spherulites. Low‐tacticity PP showed improvement on transparency by heat treatment as well as the high‐tacticity PP. Moreover, the behavior of transparency was investigated by 10 wt% addition of various L‐LDPE with wide range density. Thanks to the fine distribution particles of L‐LDPE in PP matrix, the number of generated spherulites and the growth rate of them were restrained. In the case of addition of L‐LDPE with the specific density to PP, the transparency was markedly improved by the heat treatment. According to the density of added L‐LDPE, the suitable heat‐treatment temperature condition, which showed the best transparency, was changed. This phenomenon could be explained by the refractive index difference of PP matrix and the fine distribution particles of L‐LDPE. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers

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Experimental analysis for extrusion screw geometry to produce highly transparent polypropylene sheets

Cited by 13 publications

References 13 publications

Optimization Design for Cooling Channel of the Single Screw Extruder Barrel

Optimization Design for Cooling Channel of the Single Screw Extruder Barrel

Analysis of contributing factors to production of highly transparent isotactic polypropylene extrusion sheets. Part I

Analysis of contributing factors to production of highly transparent isotactic polypropylene extrusion sheets. Part 2

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