EP0334653A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Spinning method employing melt-blowing method and melt-blowing die
Assignee: Mitsui Chemicals Inc
•
Filing: 1989-03-23
•
Granted: —
•
Expires: 2009-03-23
Abstract
Abstract One of the greatest feature of the spinning method of the present invention is, in a spinning method employing the so-called melt-blowing method, notches are formed in the tip portions of capillaries of a melt-blowing die. This allows, during spinning, a high-speed gas blowing from orifices of the die to flow through the notches whereby the flow of a molten resin being extruded through each capillary is divided into two parts or more. Also disclosed is a melt-blowing die having capillaries formed with these notches. According to the present invention, it is possible to prevent fibers from becoming entangled or ball-shaped.
Inventors
- 👤 Takayuki C/O Mitsui Petrochem. Ind. Ltd. Mende
- 👤 Takanobu C/O Mitsui Petrochem. Ind. Ltd. Sakai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 21:58
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/08; D01D4/00; D01D4/02; D01D4/025
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
99 words
A spinning method employing melt-blowing in which a thermoplastic resin is extruded through capillaries while the resin is in its molten state, and the resin is simultaneously drawn into a fibrous form by the use of a high-speed gas blowing from orifices provided in the periphery of the capillaries, said spinning method wherein notches are provided in the tip portions of said capillaries, so that, during spinning, said high-speed gas blowing from said orifices flows through said notches whereby the flow of said molten resin being extruded through each of said capillaries is divided into two parts or more.
Claim 2
Dependent Claim
99 words
A spinning method employing melt-blowing in which a thermoplastic resin is extruded through capillaries while the resin is in its molten state, and the resin is simultaneously drawn into a fibrous form by the use of a high-speed gas blowing from orifices provided in the periphery of the capillaries, said spinning method wherein notches are provided in the tip portions of said capillaries, so that, during spinning, said high-speed gas blowing from said orifices flows through said notches whereby the flow of said molten resin being extruded through each of said capillaries is divided into two parts or more.
Claim 3
Dependent Claim
46 words
A spinning method according to claim 1, wherein said notches are prepared by cutting two sides of the tip portion of each of said capillaries with a taper so that said tip portion of the capillary is generally V-shaped in cross section and has two projections.
Claim 4
Dependent Claim
39 words
A spinning method according to claim 2, wherein said capillaries comprise a plurality of capillaries arranged in an orientation in which the projections are not disposed in back-to-back contact, and the tips of said capillaries project from said orifices.
Claim 5
Dependent Claim
25 words
A spinning method according to claim 1, wherein said notches are formed in the tip of each of said capillaries in the axial direction thereof,
Claim 6
Dependent Claim
106 words
A melt-blowing die having a plurality of capillaries arranged in a series, and having outlet orifices around the outlets of the capillaries, the melt-blowing die being adapted to extrude a thermoplastic resin through the capillaries while the resin is in its molten state, and to simultaneously draw the resin into a fibrous form by the use of a high-speed gas blowing from the orifices, said melt-blowing die having notches formed in the tip portions of said capillaries so that in use the flow of said molten resin being extruded through each of said capillaries is divided into two parts or more by the high speed gas.
Claim 7
Dependent Claim
106 words
A melt-blowing die having a plurality of capillaries arranged in a series, and having outlet orifices around the outlets of the capillaries, the melt-blowing die being adapted to extrude a thermoplastic resin through the capillaries while the resin is in its molten state, and to simultaneously draw the resin into a fibrous form by the use of a high-speed gas blowing from the orifices, said melt-blowing die having notches formed in the tip portions of said capillaries so that in use the flow of said molten resin being extruded through each of said capillaries is divided into two parts or more by the high speed gas.
Claim 8
Dependent Claim
45 words
A melt-blowing die according to claim 5, wherein said notches are formed by cutting two sides of the tip portion of each of said capillaries with a taper so that said tip portion of the capillary is generally V-shaped in cross section and has projections.
Claim 9
Dependent Claim
39 words
A melt-blowing die according to claim 6, wherein said capillaries comprise a plurality of capillaries arranged in an orientation in which the projections are not disposed in back-to-back contact and the tips of said capillaries project from said orifices.
Claim 10
Dependent Claim
16 words
A melt-blowing die according to claim 7, wherein each of said projections has a flat end.
Claim 11
Dependent Claim
25 words
A melt-blowing die according to claim 5, wherein said notches are formed in the tip of each of said capillaries in the axial direction thereof,
Claim 12
Dependent Claim
26 words
A melt-blowing die according to claim 9, wherein said notches comprise a plurality of notches formed at equal intervals in the circumferential direction of the capillary.
Claim 13
Dependent Claim
26 words
A melt-blowing die according to claim 9, wherein said notches comprise a plurality of notches formed at different intervals in the circumferential direction of the capillary.
Claim 14
Dependent Claim
42 words
A melt-blowing die according 9, 10 or 11 wherein said notches form a plurality of tapering projections, each of said projections preferably having a flat-headed configuration which corresponds to a configuration obtainable by cutting off a pointed end portion of the projection.
Claim 15
Dependent Claim
42 words
A melt-blowing die according 9, 10 or 11 wherein said notches form a plurality of tapering projections, each of said projections preferably having a flat-headed configuration which corresponds to a configuration obtainable by cutting off a pointed end portion of the projection.
Claim 16
Dependent Claim
32 words
A melt-blowing die according to claim 12, wherein adjacent capillaries are disposed in such a manner that the backs of the projections of said adjacent capillaries do not contact with each other.
Claim 17
Dependent Claim
39 words
A melt-blowing die according to any of claims 5 to 13, further comprising lip portions having flat surfaces, said orifices being formed by holding the free end portions of said capillaries between said flat surfaces of said lip portions.
Claim 18
Dependent Claim
19 words
A melt-blowing die according to claim 14, wherein the tips of said capillaries slightly project from said lip portions.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.