US4295809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Die for a melt blowing process
Assignee: Tonen General Sekiyu KK
•
Filing: 1979-09-14
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Granted: 1981-10-20
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Expires: 1999-09-14
Abstract
Abstract In an improved die-nose assembly for a melt-blowing process wherein molten resin is extruded from a series of die-holes while heated gas is blown out through slots on either side of the die nose associated therewith, spacers which are movable widthwise of the die assembly are provided in the gas slots to provide effective uniformity in the gas streams across the width of the die.
Inventors
- 👤 Takashi Mikami
- 👤 Shigeo Fujii
- 👤 Shuji Okano
- 👤 Tokuzo Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:13
CPC Classifications
D; D01; D01D; D01D4/00; D01D4/02; D01D4/025; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/56
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
72 words
An extrusion die assembly for a melt blowing process with a nose piece having a triangular cross-section and extrusion holes along the apex thereof, for extrusion of melted thermoplastic resin, said assembly having gas lips defining gas slots at either side of the apex and having movable spacers provided in the gas slots said spacers contacting said nose piece and said gas lips for determination of the gap of the gas slots.
Claim 2
Dependent Claim
72 words
An extrusion die assembly for a melt blowing process with a nose piece having a triangular cross-section and extrusion holes along the apex thereof, for extrusion of melted thermoplastic resin, said assembly having gas lips defining gas slots at either side of the apex and having movable spacers provided in the gas slots said spacers contacting said nose piece and said gas lips for determination of the gap of the gas slots.
Claim 3
Dependent Claim
11 words
A die according to claim 1 wherein the spacers are slidable.
Claim 4
Dependent Claim
15 words
A die according to claim 1 wherein the spacers are movable with the gas lips.
Claim 5
Dependent Claim
24 words
A die according to claim 1 wherein the spacers are of a cross-section such that they contact the die nose substantially at one point.
Claim 6
Dependent Claim
12 words
A die nose according to claim 1 wherein the spacers are spherical.
Claim 7
Dependent Claim
12 words
A die nose according to claim 1 wherein the spacers are cylindrical.
Claim 8
Dependent Claim
13 words
A die nose according to claim 1 wherein the spacers are triangular prisms.
Claim 9
Dependent Claim
18 words
A die nose according to claim 1 wherein the spacers are made of metal, ceramics, synthetic ruby etc.
Claim 10
Dependent Claim
28 words
A die nose according to claim 1 wherein a plurality of spacers are provided in each gas slot spaced from each other along the width of the die.
Claim 11
Dependent Claim
84 words
An extrusion die for a melt blowing process with a nose piece having a triangular cross-section and extrusion holes along the apex thereof, said die assembly having gas lips defining gas slots at either side of the nose piece and having a plurality of movable spacers in each gas slot spaced from each other along the width of the die, wherein the spacers are movable with the gas lips and have a cross-section such that they contact the die nose substantially at one point.
Claim 12
Dependent Claim
84 words
An extrusion die for a melt blowing process with a nose piece having a triangular cross-section and extrusion holes along the apex thereof, said die assembly having gas lips defining gas slots at either side of the nose piece and having a plurality of movable spacers in each gas slot spaced from each other along the width of the die, wherein the spacers are movable with the gas lips and have a cross-section such that they contact the die nose substantially at one point.
Claim 13
Dependent Claim
12 words
A die nose according to claim 10 wherein the spacers are spherical.
Claim 14
Dependent Claim
12 words
A die nose according to claim 10 wherein the spacers are cylindrical.
Claim 15
Dependent Claim
13 words
A die nose according to claim 10 wherein the spacers are triangular prisms.
Claim 16
Dependent Claim
18 words
A die nose according to claim 10 wherein the spacers are made of metal, ceramics, synthetic ruby etc.
Claim 17
Dependent Claim
18 words
A die nose according to claim 1 wherein the spacers are made of metal, ceramics, or synthetic ruby.
Claim 18
Dependent Claim
18 words
A die nose according to claim 10 wherein the spacers are made of metal, ceramics, or synthetic ruby.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |