CA1132319A - Melt-spinning acrylonitrile polymer - Google Patents
Melt-spinning acrylonitrile polymerInfo
- Publication number
- CA1132319A CA1132319A CA335,006A CA335006A CA1132319A CA 1132319 A CA1132319 A CA 1132319A CA 335006 A CA335006 A CA 335006A CA 1132319 A CA1132319 A CA 1132319A
- Authority
- CA
- Canada
- Prior art keywords
- melt
- spinnerette
- capillaries
- water
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A spinnerette plate having multiple capillaries per counterbore can be effectively used to melt-spin fusion melts of acrylonitrile polyner and water without sticking together of individual filaments. The spinnerette plate has a resulting density of capillaries of at least 18 per square cent-imeter of plate surface. The fusion melt is extruded through the spinnerette directly into a steam pressurized solidification zone, the capillaries being spaced so as to prevent premature contact of the extrudate.
A spinnerette plate having multiple capillaries per counterbore can be effectively used to melt-spin fusion melts of acrylonitrile polyner and water without sticking together of individual filaments. The spinnerette plate has a resulting density of capillaries of at least 18 per square cent-imeter of plate surface. The fusion melt is extruded through the spinnerette directly into a steam pressurized solidification zone, the capillaries being spaced so as to prevent premature contact of the extrudate.
Description
~ 'I , 1 ~9 Z~19 This invention relates to a spinnerette plate for melt-spinning fiber and to a melt-spinning process for preparing fiber using such spinnerette plate. More particularly, this invention relates to a spinnerette plate having a plurality of counterbores and at least three capillaries per counterbore and to the use thereof in melt~spinning fiber from a fusion melt of acrylonitrile polymer and water.
In conventional melt-spinning of fibers, a fiber-forming polymer is heated to a temperature at which it melts, is extruded through a spinnerette plate to form filaments which rapidly cool to become solid, and the resulting filaments are then further processed to provide the desired fiber. The spin-nerette plate that is employed in such processing must contain capillaries to provide the desired filaments while satisfying two additional requirements. The capillaries must be of such dimensions as to satisfy back-pressure requirements and must be sufficiently spaced from one another as to prevent premature contact between the emerging filaments that would result in sticking together or fusion of filaments with one another. To reduce back-pressure, the capillaries are provided with counter-bores of sufficient diameter and depth.
Recent developments in the field of fiber spinning, especially acrylic fibers, have led to the development of fusion melts which can be extruded through a spinnerette plate to pro-vide filaments. These fusion melts comprise a homogeneous com-position of a fiber-forming acrylonitrile polymer and water~
Water enables the polymer to form a melt at a temperature below which the polymer would normally melt or decompose and becomes intimately associated with the molten polymer so that a single-phase melt results. Water must be used in proper proportions with the polymer to provide the single-phase fusion melt.
Since the temperature at which the fusion melt forms is above the boiling point of water at atmospheric pressure, super-atmos-pheric pressures are necessary to keep water in the system.
Such fusion melts have been effectively spun into fiber using spinnerette plates similar to those employed in conventional melt-spinning.
Because of the requirement for adequate spacing of the capillaries in spinnerette plates used for conventional melt-spinning to prevent premature contact between the nascent filaments which would result in their sticking together, the number of capillaries that can be provided in a given spinner-ette plate is greatly restricted. As a result, production capacity of a spinnerette with a given surface area is limited and usually large tow bundles can only be produced by combining the outputs from a series of spinnerettes. This, in turn, re-quires costly installations of additional spinnerettes, special-ly designed conduits and spin packs to ensure an ev~n distribu-tion of the melt to all spinning holes, provision of space for installation, and further power consumption to operate the in-creased number of spinnerettes.
There exists, therefore, the need for a single spin-nerette plate that would overcome the problems associated with prior art spinnerette plate assemblies and enable increased production to be obtained. There also exists the need for pro-cesses for providing fiber by melt spinning which enables the productivity of spinnerette plates to be increased. Such pro-visions would fulfill long-felt needs and constitute significant advances in the art.
In accordance with the present invention, there is provided a spinnerette plate for melt-spinning fiber having a plurality of counterbores and within each counterbore, at least about 3 capillaries, said capillaries being at a density of at least about 18 per square centimeter of plate surface.
In:accordance with the present invention, there is also provided a process for melt-spinning an acrylonitrile poly-mer fiber which comprises providing a homogeneous fusion melt of a fiber-forming acrylonitrile polymer and water at a tem-perature above the boiling point of water at atmospheric pres-sure and at a temperature and pressure which maintains water and said polymer in a single phase and extruding said fusion melt through a spinnerette assembly containing a spinnerette plate having a plurality of counterbores and within each counterbore at least about 3 capillaries, said capillaries having a density lS of at least about 18 per square centimeter of plate surface and extruding said fusion melt directly into a steam-pressurized solidification zone maintained under conditions such that the rate of release of water from the nascent extrudate avoids de-formation thereof.
~he present invention by employing a fu~ion melt of fiber-forming acrylonitrile polymer and water at a temperature above the boiling point of water at atmospheric pressure and at a temperature and pressure that maintains water and the polymer in a single phase and by spinning said fusion melt directly into a steam-pres~uri~ed solidification zone that controls the rate of release of water from the nascent extrudate 50 that de-formation thereof is avoided, filamentary extrudates are pro-vided which do not stick together or become deformed as they emerge from the spinnerette capillaries. Since in this pro-cess the filaments have no tendency to stick together or deform ~: - 3 -~13;;~19 as the emerge from the spinnerette, the counterbores of the spinnerette plate can be located closer together and more than one capillary can be provided in the counterbores. As a result, the productivity of the spinnerette can be greatly increased without negatively affecting the quality of the resulting fiber.
The spinnerette plate of the present invention, con-tains a number of capillaries located within each counterbore.
The counterbores are necessary to enable the spinnerette plate to operate at a suitable level of back-pressure. The spinner-ette plate as a whole will contain a substantially greater num-ber of capillaries than the prior art spinnerette plates assoc-iated with melt spinning because the problem of sticking to-gether of nascent extrudates is eliminated. Increased pro-ductivity is provided by increasing the density of capillaries in the spinnerette plate and the number of capillaries in each counterbore beyond the operative limits of conventional melt-spinning spinnerette plates which have restrictions as to hole density imposed by fusing of individual filaments.
It is possible to provide larger counterbores than are normally associated with a capillary and provide numerous capillaries therein although this has often been found to be unnecessary. It is preferable to provide a pattern of counter-bores more closely spaced than those in the prior art spinner-ette plates for melt spinning in a pattern providing uniform extrusion of the spinning melt through the spinnerette plate.
The combination of more closely spaced counterbores with a plurality of capillaries within each counterbore gives rise to a substantial increase in the total number of capillaries for a given spinnerette surface, and hence in the productivity of the spinnerette.
1~323~ ~
A typical spinnerette plate of the present invention is shown in the accompanying drawings, in which Figure 1 repre-sents a top view of the spinnerette plate showing the pattern of counterbores and capillaries therein and Figure 2 shows a cross-sectional view of the same spinnerette plate showing de-tails of the counterbores and capillaries.
In carrying out the process of the present invention, it is necessary to provide a homogeneous fusion melt of a fiber-forming acrylonitrile polymer and water. Any fiber-forming acrylonitrile polymer that can form a fusion melt with water at a temperature above the boiling point of water at atmospheric pressure and at a pressure and temperature sufficient to main-tain water and the polymer in a single fluid phase, can be used in the process of the present invention. Polymers falling into this category are known in the art. The fusion melt is prepared at a temperature above the boiling point at atmospheric pres-sure of water and eventually reaches a temperature and pressure sufficient to maintain water and the polymer in a single, fluid phase.
The homogeneous fusion melt thus provided is extruded through the spinnerette plate of the present invention directly into a steam-pressurized solidification zone that controls the rate of release of water from the nascent filaments so that deformation thereof is avoided and the process is able to pro-vide filaments which solidify without sticking together one with another in spite of the close proximity of adjacent capillaries.
The extruded filaments are processed according to conventional procedures to provide desirable filamentary materials which may have application in textile and other applications.
The pressurized solidification zone used in the pro-1~3Z319 cess of the present invention is a critical feature of the pro-cess. If this pressurized solidification zone is omitted, water is so rapidly released from the nascent filaments which would emerge into atmospheric conditions that the filaments would become inflated or deformed and interfere with neighboring fil-aments and necessitate reduction in the number of operative spinnerette capillaries which would defeat the object of the invention. On the other hand, by employing the presqurized solidification zone operating at suitable steam pressure, the rate of release of water can be controlled as the nascent fil-aments solidify so that foaming and deformation thereof is avoided and optimum stretching is possible. The particular pressure of steam will vary widely depending upon the polymer employed, the spinning temperature employed and the like. The useful values for given systems a~e those values which minimize or avoid foaming or other forms of de~ormation of the filaments and provide optimum stretching. These values can readiIy be determined for any given system of polymer and water taking into account the teachings herein given.
A particularly preferred embodiment of the process of the present invention is drawing the nascent extrudate while it remains in the steam-pressurized solidification zone. Such drawing can be accomplished in one or more stretches and can eliminate any subsequent drawing normally required for fiber orientation. It is particularly preferred to conduct drawing in two stages with the stretch ratio of the second stage being larger than that of the first stage. It is also preferred to relax the drawn fiber in steam generally under conditions which provide from about 20% to 35% filament shrinkage.
The invention is more fully illustrated in the exam-1~3'Z;~l~
ples which fo]]ow, wherein all parts and percentages are by weight unless otherwise specified.
Kinematic molecular weight (Mk) is obtalned ~from ~ ~~
the following relationship: ~ = 1 Mk wherein ~ is the average effluent time (t) in seconds for a solution of 1 gram of the polymer in 100 milliliters of 53 weight percent aqueous sodium thiocyanate solvent at 40C. multiplied by the viscometer factor and A is the solution factor derived from a polymer of known molecular weight and in the present case is equal to 3,500.
-~~-~ ~ BXAMPLE 1 ~ ~-~~~~----------- -- ------ _ A fusion melt of 15~ water and 85% of an acrylonitrile polymer of the following composition was prepared at autogene-ous pressure and 170C.:
Acrylonitrile 89.3%
Methyl methacrylate 10~7%
Molecular weight, kinematic 58,000 The fusion melt was spun at 170C. through a spinnerette assem-bly having orifice characteristics as follows:
Capillary diameter 200 microns Capillary spacingl 0.47 millimeters Capillaries per counterbore 7 Counterbore diameter1.2 millimeters Counterbore spacingl4.1 millimeters Capillary density 62 per sq. cm.
1 center to center The extrusion was directly into a solidification zone pressuriz-ed with saturated steam at 15 pounds per square inch. The ex-truded filament~ were stretched in a first stage at a stretch ratio of 3.8 and in a second stage at 6~7 for a total stretch of 25.5 x. The filaments were dried at 138C. and relaxed in ~32319 steam at~ll6C. Fiber of about 12 denier per fiIament was ob- ~~~-~~-tained having the following properties:
Straight tenacity grams/denier 3.4 Straight elongation % 35 Loop tenacity grams/denier 2.1 Loop elongation % 13 No sticking together of the filaments occurred and continuous processing was accomplished. --COMPARATIVE EXAMPLE A
Using the spinnerette assembly described in Example r~ 1, a melt of polypropylene (Rexene Grade PP 3153) of fiber grade having a melt index of 3 dg/min. was prepared at 260C. and extruded into static air at 25C. The melt emerging from the spinnerette orifices merged to form macrofilaments from the union of the individual filaments issuing from single capillar-ies. Thus, filaments of the desired denier were not obtained using this spinnerette plate design.
The procedure of Example 1 was again followed with the following exceptions: The polymer had a kinematic molecular weight value of 40,000 and the spinnerette assembly had the following characteristics:
Capillary diameter85 microns Capillary spacing 0.40 millimeter Capillary per counterbore 19 Counterbore diameter 2.0 millimeters Counterbore spacing 1.4 millimeters Capillary density875 per sq. cm.
Continuous spinning was conducted with no sticking together or fusion of the individual filaments and fiber of ~a~,a~,4 113~31~
substantially the same properties as obtained in Example 1 was obtained.
When the polypropylene melt described in Comparative Example A was extruded, extensive fusion of the individual filaments occurred and it was not possible to provide the de-sired filament denier.
, EXAMPLES 3 ~ 5 Following the procedure of Example 1, a number of runs were made using spinnerette assemblies of different design in each run as shown in the table which also gives the example number. In each instance, continuous spinning was effected with no sticking together of the individual filaments.
g _ ~ ~13;2~
P~
m ~1 ,, C~
o a) u~
O ~J ~ ~ ~r C~ ~
M,1 ~ ,1 h .~ o ~ ~
~ ,i ,i ~( m ¦ ~ ~
~1 CO
E~ ~::
~ a) a~
Q ~: ~
,~ O rl O
m ~ . . .
U~ ~ U
S~ ,1 ~1 ~
_I
.,., u~ In Ln 0 tn o~ x oo ~ ~ ~ h r~ ~ a~
O rl a~ u ~
_I rl rl O rl ~1 ~ ~ ~ u~
In conventional melt-spinning of fibers, a fiber-forming polymer is heated to a temperature at which it melts, is extruded through a spinnerette plate to form filaments which rapidly cool to become solid, and the resulting filaments are then further processed to provide the desired fiber. The spin-nerette plate that is employed in such processing must contain capillaries to provide the desired filaments while satisfying two additional requirements. The capillaries must be of such dimensions as to satisfy back-pressure requirements and must be sufficiently spaced from one another as to prevent premature contact between the emerging filaments that would result in sticking together or fusion of filaments with one another. To reduce back-pressure, the capillaries are provided with counter-bores of sufficient diameter and depth.
Recent developments in the field of fiber spinning, especially acrylic fibers, have led to the development of fusion melts which can be extruded through a spinnerette plate to pro-vide filaments. These fusion melts comprise a homogeneous com-position of a fiber-forming acrylonitrile polymer and water~
Water enables the polymer to form a melt at a temperature below which the polymer would normally melt or decompose and becomes intimately associated with the molten polymer so that a single-phase melt results. Water must be used in proper proportions with the polymer to provide the single-phase fusion melt.
Since the temperature at which the fusion melt forms is above the boiling point of water at atmospheric pressure, super-atmos-pheric pressures are necessary to keep water in the system.
Such fusion melts have been effectively spun into fiber using spinnerette plates similar to those employed in conventional melt-spinning.
Because of the requirement for adequate spacing of the capillaries in spinnerette plates used for conventional melt-spinning to prevent premature contact between the nascent filaments which would result in their sticking together, the number of capillaries that can be provided in a given spinner-ette plate is greatly restricted. As a result, production capacity of a spinnerette with a given surface area is limited and usually large tow bundles can only be produced by combining the outputs from a series of spinnerettes. This, in turn, re-quires costly installations of additional spinnerettes, special-ly designed conduits and spin packs to ensure an ev~n distribu-tion of the melt to all spinning holes, provision of space for installation, and further power consumption to operate the in-creased number of spinnerettes.
There exists, therefore, the need for a single spin-nerette plate that would overcome the problems associated with prior art spinnerette plate assemblies and enable increased production to be obtained. There also exists the need for pro-cesses for providing fiber by melt spinning which enables the productivity of spinnerette plates to be increased. Such pro-visions would fulfill long-felt needs and constitute significant advances in the art.
In accordance with the present invention, there is provided a spinnerette plate for melt-spinning fiber having a plurality of counterbores and within each counterbore, at least about 3 capillaries, said capillaries being at a density of at least about 18 per square centimeter of plate surface.
In:accordance with the present invention, there is also provided a process for melt-spinning an acrylonitrile poly-mer fiber which comprises providing a homogeneous fusion melt of a fiber-forming acrylonitrile polymer and water at a tem-perature above the boiling point of water at atmospheric pres-sure and at a temperature and pressure which maintains water and said polymer in a single phase and extruding said fusion melt through a spinnerette assembly containing a spinnerette plate having a plurality of counterbores and within each counterbore at least about 3 capillaries, said capillaries having a density lS of at least about 18 per square centimeter of plate surface and extruding said fusion melt directly into a steam-pressurized solidification zone maintained under conditions such that the rate of release of water from the nascent extrudate avoids de-formation thereof.
~he present invention by employing a fu~ion melt of fiber-forming acrylonitrile polymer and water at a temperature above the boiling point of water at atmospheric pressure and at a temperature and pressure that maintains water and the polymer in a single phase and by spinning said fusion melt directly into a steam-pres~uri~ed solidification zone that controls the rate of release of water from the nascent extrudate 50 that de-formation thereof is avoided, filamentary extrudates are pro-vided which do not stick together or become deformed as they emerge from the spinnerette capillaries. Since in this pro-cess the filaments have no tendency to stick together or deform ~: - 3 -~13;;~19 as the emerge from the spinnerette, the counterbores of the spinnerette plate can be located closer together and more than one capillary can be provided in the counterbores. As a result, the productivity of the spinnerette can be greatly increased without negatively affecting the quality of the resulting fiber.
The spinnerette plate of the present invention, con-tains a number of capillaries located within each counterbore.
The counterbores are necessary to enable the spinnerette plate to operate at a suitable level of back-pressure. The spinner-ette plate as a whole will contain a substantially greater num-ber of capillaries than the prior art spinnerette plates assoc-iated with melt spinning because the problem of sticking to-gether of nascent extrudates is eliminated. Increased pro-ductivity is provided by increasing the density of capillaries in the spinnerette plate and the number of capillaries in each counterbore beyond the operative limits of conventional melt-spinning spinnerette plates which have restrictions as to hole density imposed by fusing of individual filaments.
It is possible to provide larger counterbores than are normally associated with a capillary and provide numerous capillaries therein although this has often been found to be unnecessary. It is preferable to provide a pattern of counter-bores more closely spaced than those in the prior art spinner-ette plates for melt spinning in a pattern providing uniform extrusion of the spinning melt through the spinnerette plate.
The combination of more closely spaced counterbores with a plurality of capillaries within each counterbore gives rise to a substantial increase in the total number of capillaries for a given spinnerette surface, and hence in the productivity of the spinnerette.
1~323~ ~
A typical spinnerette plate of the present invention is shown in the accompanying drawings, in which Figure 1 repre-sents a top view of the spinnerette plate showing the pattern of counterbores and capillaries therein and Figure 2 shows a cross-sectional view of the same spinnerette plate showing de-tails of the counterbores and capillaries.
In carrying out the process of the present invention, it is necessary to provide a homogeneous fusion melt of a fiber-forming acrylonitrile polymer and water. Any fiber-forming acrylonitrile polymer that can form a fusion melt with water at a temperature above the boiling point of water at atmospheric pressure and at a pressure and temperature sufficient to main-tain water and the polymer in a single fluid phase, can be used in the process of the present invention. Polymers falling into this category are known in the art. The fusion melt is prepared at a temperature above the boiling point at atmospheric pres-sure of water and eventually reaches a temperature and pressure sufficient to maintain water and the polymer in a single, fluid phase.
The homogeneous fusion melt thus provided is extruded through the spinnerette plate of the present invention directly into a steam-pressurized solidification zone that controls the rate of release of water from the nascent filaments so that deformation thereof is avoided and the process is able to pro-vide filaments which solidify without sticking together one with another in spite of the close proximity of adjacent capillaries.
The extruded filaments are processed according to conventional procedures to provide desirable filamentary materials which may have application in textile and other applications.
The pressurized solidification zone used in the pro-1~3Z319 cess of the present invention is a critical feature of the pro-cess. If this pressurized solidification zone is omitted, water is so rapidly released from the nascent filaments which would emerge into atmospheric conditions that the filaments would become inflated or deformed and interfere with neighboring fil-aments and necessitate reduction in the number of operative spinnerette capillaries which would defeat the object of the invention. On the other hand, by employing the presqurized solidification zone operating at suitable steam pressure, the rate of release of water can be controlled as the nascent fil-aments solidify so that foaming and deformation thereof is avoided and optimum stretching is possible. The particular pressure of steam will vary widely depending upon the polymer employed, the spinning temperature employed and the like. The useful values for given systems a~e those values which minimize or avoid foaming or other forms of de~ormation of the filaments and provide optimum stretching. These values can readiIy be determined for any given system of polymer and water taking into account the teachings herein given.
A particularly preferred embodiment of the process of the present invention is drawing the nascent extrudate while it remains in the steam-pressurized solidification zone. Such drawing can be accomplished in one or more stretches and can eliminate any subsequent drawing normally required for fiber orientation. It is particularly preferred to conduct drawing in two stages with the stretch ratio of the second stage being larger than that of the first stage. It is also preferred to relax the drawn fiber in steam generally under conditions which provide from about 20% to 35% filament shrinkage.
The invention is more fully illustrated in the exam-1~3'Z;~l~
ples which fo]]ow, wherein all parts and percentages are by weight unless otherwise specified.
Kinematic molecular weight (Mk) is obtalned ~from ~ ~~
the following relationship: ~ = 1 Mk wherein ~ is the average effluent time (t) in seconds for a solution of 1 gram of the polymer in 100 milliliters of 53 weight percent aqueous sodium thiocyanate solvent at 40C. multiplied by the viscometer factor and A is the solution factor derived from a polymer of known molecular weight and in the present case is equal to 3,500.
-~~-~ ~ BXAMPLE 1 ~ ~-~~~~----------- -- ------ _ A fusion melt of 15~ water and 85% of an acrylonitrile polymer of the following composition was prepared at autogene-ous pressure and 170C.:
Acrylonitrile 89.3%
Methyl methacrylate 10~7%
Molecular weight, kinematic 58,000 The fusion melt was spun at 170C. through a spinnerette assem-bly having orifice characteristics as follows:
Capillary diameter 200 microns Capillary spacingl 0.47 millimeters Capillaries per counterbore 7 Counterbore diameter1.2 millimeters Counterbore spacingl4.1 millimeters Capillary density 62 per sq. cm.
1 center to center The extrusion was directly into a solidification zone pressuriz-ed with saturated steam at 15 pounds per square inch. The ex-truded filament~ were stretched in a first stage at a stretch ratio of 3.8 and in a second stage at 6~7 for a total stretch of 25.5 x. The filaments were dried at 138C. and relaxed in ~32319 steam at~ll6C. Fiber of about 12 denier per fiIament was ob- ~~~-~~-tained having the following properties:
Straight tenacity grams/denier 3.4 Straight elongation % 35 Loop tenacity grams/denier 2.1 Loop elongation % 13 No sticking together of the filaments occurred and continuous processing was accomplished. --COMPARATIVE EXAMPLE A
Using the spinnerette assembly described in Example r~ 1, a melt of polypropylene (Rexene Grade PP 3153) of fiber grade having a melt index of 3 dg/min. was prepared at 260C. and extruded into static air at 25C. The melt emerging from the spinnerette orifices merged to form macrofilaments from the union of the individual filaments issuing from single capillar-ies. Thus, filaments of the desired denier were not obtained using this spinnerette plate design.
The procedure of Example 1 was again followed with the following exceptions: The polymer had a kinematic molecular weight value of 40,000 and the spinnerette assembly had the following characteristics:
Capillary diameter85 microns Capillary spacing 0.40 millimeter Capillary per counterbore 19 Counterbore diameter 2.0 millimeters Counterbore spacing 1.4 millimeters Capillary density875 per sq. cm.
Continuous spinning was conducted with no sticking together or fusion of the individual filaments and fiber of ~a~,a~,4 113~31~
substantially the same properties as obtained in Example 1 was obtained.
When the polypropylene melt described in Comparative Example A was extruded, extensive fusion of the individual filaments occurred and it was not possible to provide the de-sired filament denier.
, EXAMPLES 3 ~ 5 Following the procedure of Example 1, a number of runs were made using spinnerette assemblies of different design in each run as shown in the table which also gives the example number. In each instance, continuous spinning was effected with no sticking together of the individual filaments.
g _ ~ ~13;2~
P~
m ~1 ,, C~
o a) u~
O ~J ~ ~ ~r C~ ~
M,1 ~ ,1 h .~ o ~ ~
~ ,i ,i ~( m ¦ ~ ~
~1 CO
E~ ~::
~ a) a~
Q ~: ~
,~ O rl O
m ~ . . .
U~ ~ U
S~ ,1 ~1 ~
_I
.,., u~ In Ln 0 tn o~ x oo ~ ~ ~ h r~ ~ a~
O rl a~ u ~
_I rl rl O rl ~1 ~ ~ ~ u~
Claims (10)
1. A spinnerette plate for melt-spinning fiber having a plurality of counterbores and within each counterbore, at least about 3 capillaries, said capillaries being at a den-sity of at least about 18 per square centimeter of plate surface.
2. The spinnerette plate of Claim 1 having a capil-lary density of 62 per square centimeter.
3. The spinnerette plate of Claim 1 having 7 capil-laries per counterbore.
4. The spinnerette plate of Claim 1 having a capil-lary density of 377 per square centimeter.
5. The spinnerette plate of Claim 1 having 19 capil-laries per counterbore.
6. A process for melt-spinning fiber which comprises providing a homogeneous fusion melt of a fiber-forming acrylo-nitrile polymer and water at a temperature above the boiling point of water at atmospheric pressure and at a temperature and pressure which maintains water and said polymer in a single melt phase and extruding said fusion melt through a spinnerette plate having a plurality of counterbores and within each counter-bore, at least about 3 capillaries, said capillaries having a density of at least about 18 per square centimeter of plate surface, said extrusion being directly into a steam pressurized solidification zone maintained under conditions such that the rate of release of water from the nascent extrudate avoids de-formation thereof.
7. The process of Claim 6 wherein said extrudate is drawn while in said solidification zone.
8. The process of Claim 7 wherein said drawing is done in at least two stages, the second stage being at a stretch ratio greater than the first.
9. The process of Claim 7 wherein the drawn extrudate is relaxed in steam.
10. The process of Claim 8 wherein the drawn extrudate is relaxed in steam.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US93820278A | 1978-08-30 | 1978-08-30 | |
| US938,202 | 1978-08-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1132319A true CA1132319A (en) | 1982-09-28 |
Family
ID=25471090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA335,006A Expired CA1132319A (en) | 1978-08-30 | 1979-08-15 | Melt-spinning acrylonitrile polymer |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1132319A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112342628A (en) * | 2020-11-03 | 2021-02-09 | 江苏通亦和科技有限公司 | Industrial textile product melt-blown method nozzle and spinneret plate thereof |
-
1979
- 1979-08-15 CA CA335,006A patent/CA1132319A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112342628A (en) * | 2020-11-03 | 2021-02-09 | 江苏通亦和科技有限公司 | Industrial textile product melt-blown method nozzle and spinneret plate thereof |
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