Melt spinning resin composition, manufacturing method for same, and fiber manufacturing method
AssigneeKao Corporation
InventorsTakahiro Hirano, Hideo Kobayashi, Takehiko Uematsu, Shohei Natsui
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Abstract
The resin composition for melt spinning of the present invention is a filament having a melt viscosity of 250 Pa·s or less at 200° C. and a shear rate of 0.1 s−1 and a tensile strength of 10 MPa or more. The filament can be produced by forming a molten liquid of a resin composition having a melt viscosity of 250 Pa·s or less at 200° C. and a shear rate of 0.1 s−1 into a filament shape to provide a formed material, and conveying and concurrently cooling the formed material. The present invention also provides a resin composition for melt spinning being a filament, and a method for producing fiber using a melt spinning apparatus.
Claims20
A method for producing a fiber using a melt spinning apparatus, the method comprising
- feeding a filament comprising a thermoplastic resin composition to a heating device in a feed direction;
- heating the filament using the heating device to produce a molten filament comprising the thermoplastic resin composition in a molten state;
- and
- providing a force in a spinning direction to the molten filament to produce the fiber;
- and
- collecting the fiber,
- wherein
- the thermoplastic resin composition has a melt viscosity of 250 Pa·s or less at 200° C., a shear rate of 0.1 s−1 or more, and a tensile strength of 10 MPa or more,
- the method produces a continuous fiber while the feeding is performed,
- the fiber has a mean fiber diameter of 0.1 to 10 μm, and
- the force is provided by at least one selected from the group consisting of blowing gas and electric repulsion of the molten filament, the electric repulsion generated by applying a voltage to an electrode.
A melt spinning system, comprising
- a supply port to which a filament is supplied in a feed direction;
- a heating section connected to the supply port and configured to receive the filament from the supply port and melt the filament without application of any kneading force;
- a nozzle connected to the heating section and configured to receive a molten filament from the heating section and provide a force in a spinning direction to the molten filament to produce a fiber;
- and
- at least one selected from the group consisting of
- a gas flow spraying section configured to provide a gas flow in a spinning direction, the gas flow configured to provide the force to form the molten filament into the fiber, and
- an electric charging device including an electrode configured to create an electric field between the electrode and the nozzle and to electrically charge the molten filament such that an electric force is supplied to the molten filament to form the molten filament into the fiber, wherein the filament is supplied from the supply port, and concurrently the molten filament is discharged from the nozzle into an electrical field to be spun, in a state where the electrical field is formed by the electrical charging device,
- wherein
- the filament comprises a thermoplastic resin composition having a melt viscosity of 250 Pa·s or less at 200° C., a shear rate of 0.1 s−1 or more, and a tensile strength of 10 MPa or more,
- the heating section is configured such that and the filament is supplied such that the filament is substantially molten only when the filament passes from the heating section to the nozzle,
- the force is supplied such that the molten filament is formed into the fiber, and
- the fiber has a mean fiber diameter of 0.1 to 10 μm.
Dependencies are inferred from the claim text.