EP0244217A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process and apparatus
Assignee: EIDP Inc
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Filing: 1987-04-29
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Granted: —
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Expires: 2007-04-29
Abstract
Abstract An improved melt spinning process for preparing polymeric fiiaments, wherein the freshly-extruded filaments enters an enclosed zone that is maintained at superatmospheric pressure by a controlled flow of air at a low positive pressure, and the filaments leave the zone through a constriction, either a venturi or a tube, assisted by the cocurrent flow of such air at a high controlled velocity.
Inventors
- 👤 Benjamin Chiatse Sze
- 👤 George Vassilatos
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 02:01
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/12; D01D5/14; D01D5/08; D01D5/088; D01D5/092; D01D5/098
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
89 words
In a melt spinning process for spinning continuous polymeric filaments in a'path from a spinning pack at a spinning speed controlled by a withdrawal means the improvement comprising: directing a gas into a zone enclosing said path, said zone extending from said spinning pack to a location between the spinning pack and the withdrawal means; maintaining said zone under superatmospheric pressure of less than 1 kg/cm 2 and increasing the velocity of the gas as it leaves the zone to a level greater than the velocity of the filaments.
Claim 2
Dependent Claim
89 words
In a melt spinning process for spinning continuous polymeric filaments in a'path from a spinning pack at a spinning speed controlled by a withdrawal means the improvement comprising: directing a gas into a zone enclosing said path, said zone extending from said spinning pack to a location between the spinning pack and the withdrawal means; maintaining said zone under superatmospheric pressure of less than 1 kg/cm 2 and increasing the velocity of the gas as it leaves the zone to a level greater than the velocity of the filaments.
Claim 3
Dependent Claim
10 words
The process of claim 1, said polymeric filaments being polyester.
Claim 4
Dependent Claim
9 words
The process of claim 1, said filaments being nylon.
Claim 5
Dependent Claim
12 words
The process of claim 1, said filaments being polypropylene. 1 to 4,
Claim 6
Dependent Claim
22 words
The process of any one of Claims/said gas being air, the temperature of said gas being from about 5°C to about 250°C.
Claim 7
Dependent Claim
32 words
The process of any one of Claims 1 to 5, the velocity of the gas leaving said zone being increased - from 1.5 to about 100 times the velocity of the filaments.
Claim 8
Independent Claim
98 words
An apparatus for spinning continuous polymeric filaments in a path from a spinning pack to a withdrawal means the improvement comprising: a housing enclosing said path, said housing extending from said spinning pack at one end to a location between the spinning pack and the withdrawal means at its other end; means to supply a gas under superatmospheric pressure to said housing; and means attached to the other end of the housing for increasing the velocity of the gas as it leaves the housing at its other end to a level greater than the velocity of the filaments.
Claim 9
Independent Claim
98 words
An apparatus for spinning continuous polymeric filaments in a path from a spinning pack to a withdrawal means the improvement comprising: a housing enclosing said path, said housing extending from said spinning pack at one end to a location between the spinning pack and the withdrawal means at its other end; means to supply a gas under superatmospheric pressure to said housing; and means attached to the other end of the housing for increasing the velocity of the gas as it leaves the housing at its other end to a level greater than the velocity of the filaments.
Claim 10
Dependent Claim
41 words
The apparatus of claim 7, said means for increasing the velocity of the gas comprising: a venturi having a converging inlet and a flared outlet connected by a constriction said converging inlet being joined to said other end of said housing.
Claim 11
Dependent Claim
34 words
The apparatus of claim 7, said means for increasing the velocity of the gas comprising a tube having an inlet and an outlet, said inlet being joined to said other end of said housing.
Claim 12
Dependent Claim
20 words
The apparatus of claim 8, including an aspirating jet located in said path between said venturi and said withdrawal means.
Claim 13
Dependent Claim
20 words
The apparatus of claim 9, including an aspirating jet located in said path between said tube and said withdrawal means.
Claim 14
Dependent Claim
41 words
The apparatus of claim 9 or claim 11 including a continuous wall surrounding said tube and spaced therefrom to form an annular space surrounding said tube, said wall adjoining said housing; and means for supplying pressurized gas to said annular space.
Claim 15
Dependent Claim
29 words
The process as defined in any one of Claims 1 to 6,said spinning speed being at least 7000 m/min, said filaments having a denier per filament of about 2.5.
Claim 16
Dependent Claim
31 words
The process as defined in any one of claims 1 to 6 said spinning speed being at least 400 m/min, said filaments having a denier per filament of at least 20.
References Cited (Backward Citations)
No citation records indexed.
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