Bowing Phenomenon in Double Bubble Tubular Film Processing for PA 6
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M. Takashige
Abstract
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.
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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
