Thickness Uniformity of Double Bubble Tubular Film Process for Producing Biaxially Oriented PA 6 Film
| Autor: | Toshiro Yamada, M. Takashige, T. Kanai |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Materials science
Polymers and Plastics business.industry General Chemical Engineering Bubble Young's modulus Izod impact strength test Industrial and Manufacturing Engineering Stress (mechanics) Condensed Matter::Materials Science symbols.namesake Optics Condensed Matter::Superconductivity Scientific method Ultimate tensile strength Materials Chemistry symbols Composite material Deformation (engineering) business Shrinkage |
| Zdroj: | International Polymer Processing. 19:47-55 |
| ISSN: | 2195-8602 0930-777X |
| DOI: | 10.3139/217.1810 |
| Popis: | It is known that while the double bubble tubular film process gives better impact strength and more uniform shrinkage balance than the tenter process, yet it is relatively poor in film thickness uniformity. The film thickness uniformity of the PA 6 produced by the double bubble tubular film process was investigated. The optimum stretching stress during the double bubble tubular film process exists. The bubble breaks over stress 130 MPa and bubble is unstable below stress 60 MPa. In the optimum condition, which is process temperature 310 °C and stretching ratio 3.2, stretched film uniformity was twice worse than non-stretched film one. The thickness uniformity of the film stretched in the optimum condition was better than that of the film stretched at higher process temperature and at lower stretching ratio. In the observations of the bubble sample through the polarizing plates, deformation pattern showed the equality of deformation. Thickness uniformity of non-stretched film significantly affects the thickness uniformity of biaxially oriented film. Local stretching ratio, which varies along the film width, influences tensile modulus and tensile strength at break. In order to obtain the uniform physical properties of film, it is important to produce the film with uniform thickness. Film thickness uniformity can be improved when stretching stress is high and bubble stability is good. These factors are influenced by stretching temperature, stretching ratio and air velocity from air ring. |
| Databáze: | OpenAIRE |
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