Thickness Uniformity of Double Bubble Tubular Film Process for Producing Biaxially Oriented PA 6 Film
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M. Takashige
Abstract
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.
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© 2004, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Screw Extrusion
- Physico-Mathematical Model for the Description of the Temperature Development and the Power Consumption in Co-Rotating Twin Screw Extruders
- Prediction of Residence Time Distribution for Different Screw Configurations of a Ko-Kneader by using a Cluster Model
- Die Extrusion
- In-line Monitoring of PVC Melt Viscosity Using Dielectric Measurements
- Die Wall Effects, Contact Angles and Slippage in the Flow of Polymer Melts and Polymer-Particulate Compounds with Carboxylic Acids in a Slit Die
- Crystallization
- Fractionated Crystallization and Morphology in Binary Blends of Isotactic PP and HDPE with Cycloolefin Copolymers
- Impact Strength of β-Nucleated Polypropylene
- Film
- Extensional Rheology of Polypropylene in Relation to Processing Characteristics
- Thickness Uniformity of Double Bubble Tubular Film Process for Producing Biaxially Oriented PA 6 Film
- Bowing Phenomenon in Double Bubble Tubular Film Processing for PA 6
- Molding
- A New Design Method to Improve Flow Uniformity in a Reaction Injection Mold Entry
- Three Dimensional Analysis of Shape Deformation in Injection Molded Optical Lens
- Development of a Hybrid Solid-Microcellular Co-injection Molding Process
- PPS News
- PPS News
Artikel in diesem Heft
- Contents
- Contents
- Screw Extrusion
- Physico-Mathematical Model for the Description of the Temperature Development and the Power Consumption in Co-Rotating Twin Screw Extruders
- Prediction of Residence Time Distribution for Different Screw Configurations of a Ko-Kneader by using a Cluster Model
- Die Extrusion
- In-line Monitoring of PVC Melt Viscosity Using Dielectric Measurements
- Die Wall Effects, Contact Angles and Slippage in the Flow of Polymer Melts and Polymer-Particulate Compounds with Carboxylic Acids in a Slit Die
- Crystallization
- Fractionated Crystallization and Morphology in Binary Blends of Isotactic PP and HDPE with Cycloolefin Copolymers
- Impact Strength of β-Nucleated Polypropylene
- Film
- Extensional Rheology of Polypropylene in Relation to Processing Characteristics
- Thickness Uniformity of Double Bubble Tubular Film Process for Producing Biaxially Oriented PA 6 Film
- Bowing Phenomenon in Double Bubble Tubular Film Processing for PA 6
- Molding
- A New Design Method to Improve Flow Uniformity in a Reaction Injection Mold Entry
- Three Dimensional Analysis of Shape Deformation in Injection Molded Optical Lens
- Development of a Hybrid Solid-Microcellular Co-injection Molding Process
- PPS News
- PPS News
