CN114277453B - Air spinning channel for spandex and spinning method - Google Patents
Air spinning channel for spandex and spinning method Download PDFInfo
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- CN114277453B CN114277453B CN202111682457.1A CN202111682457A CN114277453B CN 114277453 B CN114277453 B CN 114277453B CN 202111682457 A CN202111682457 A CN 202111682457A CN 114277453 B CN114277453 B CN 114277453B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Abstract
The air spinning channel provided by the invention comprises an upper air inlet system, an upper air return system, an upper channel, a lower channel and a lower air return system, wherein the upper air inlet system and the upper air return system are oppositely arranged on the left side and the right side of the upper channel as shown in the figure, the lower air return system is arranged at the bottom of the lower channel, the width of the upper channel in the left-right direction is the same as that of a conventional channel, the width of the lower channel is smaller than that of the upper channel, and the right side wall of the lower channel is flush with the right side wall of the upper channel in the vertical direction. According to the air spinning channel for spandex, the side wall of the lower channel on the air inlet side moves towards the return air side, so that the speed and the uniformity of transverse air flow at the upper part of the channel are effectively improved, the shake of spandex yarns in the channel is reduced, yarn doubling is avoided in a limited channel space, functionalized spandex yarns can be spun at high density, and the production efficiency of the functionalized spandex yarns is improved.
Description
Technical Field
The invention relates to spandex spinning equipment, in particular to an air spinning channel.
Background
The spinning channel is an important device in the spandex spinning process, polyurethane spinning stock solution enters the spinning channel through a spinneret plate in the spandex spinning process, meanwhile, heated gas is introduced into the channel, the gas flows to the bottom of the channel along with the stock solution trickle, and as the gas in the channel and the channel keeps high temperature, the solvent can be quickly evaporated from the stock solution trickle and moves to the bottom of the channel. The flow of gas in a shaft is very complicated, and the flow velocity and flow direction of the gas are greatly influenced by the size and structure of the shaft. The spinning shaft can be divided into a nitrogen shaft and an air shaft according to different gases. The air channel usually adopts a cross-flow channel, the width of an upper channel and the width of a middle lower channel of the traditional air channel are the same, and an upper air inlet structure, an upper return air structure and a lower return air structure are arranged. Traditional air corridor is higher because the wind pressure is in air inlet net lower part, it is higher to go up return air net lower part negative pressure, lead to the air current short circuit in the corridor, thereby cause the gas velocity of flow on the top of corridor to be lower than other regional gas velocity of flow, and then cause high-temperature gas to flow into the in-process of return air inlet from last air inlet through corridor upper portion, former liquid trickle swings on the width direction, to the functional spandex silk that is difficult to spinning such as the slow easy design spandex silk of super soft spandex silk and the evaporation that the modulus is lower, spandex silk is with regard to easy doubling itself, and corridor upper portion former liquid trickle viscosity is great, the uneven meeting of air velocity leads to spandex silk doubling phenomenon aggravation. In order to solve this problem, it is generally necessary to reduce the number of ends of the spandex yarn to increase the distance between the spandex yarns, but this reduces the productivity of the spandex yarn. In addition, the low air flow speed at the upper part of the shaft causes the solvent quantity taken away from the raw liquid trickle by the upper shaft to be reduced, the volatilized solvent is easy to accumulate at the lower part of the shaft, and the accumulated solvent can cause explosion due to oxygen contained in the air shaft.
Disclosure of Invention
In order to solve the above problems, the present invention provides an air spinning shaft for spandex and a spinning method, and the width of the upper shaft and the lower shaft is the width of the shaft from the upper air inlet net direction to the upper air return net direction without special description.
The specific scheme of the invention is as follows:
the air spinning channel for spandex comprises an upper air inlet system, an upper air return system, an upper channel, a lower channel and a lower air return system, wherein the upper air inlet system and the upper air return system are arranged on two sides of the upper channel relatively, the upper air inlet system comprises an air inlet static pressure chamber and an air inlet net, the upper air return system comprises an upper air return net and an upper air return static pressure chamber, the bottom of the upper channel is communicated with the lower channel, the air spinning channel is characterized in that the lengths of the upper channel, the air inlet net and the upper air return net in the vertical direction are equal, the width of the upper channel is the same as that of a conventional channel, the width of the lower channel is smaller than that of the upper channel, and the side wall of the lower channel on one side of the upper air return net is flush with the upper air return net in the vertical direction.
Compared with a conventional air channel for spandex spinning, the channel provided by the invention is divided into an upper part and a lower part, wherein the width of the upper channel between an upper air inlet net and an upper return air net is the same as that of the conventional channel, and the side wall of the lower channel on one side of the upper air inlet net translates in the direction of the upper return air net, namely the channel provided by the invention has a narrower size at the middle lower part. The inventor finds that the wind pressure at the upper part of the channel can be increased by narrowing the size of the middle and lower channels in the long-term production and research and development processes, so that the flow velocity of the airflow at the uppermost end of the channel is improved, meanwhile, after the lower channel is narrowed, the wind velocity at the lower part of the upper air inlet net is balanced in the vertical direction in the upper air inlet narrowing region, the wind velocity of the air at the upper part of the upper channel is increased, the condition that the temperature at the upper part of the channel is lower due to the fact that the flow velocity of the airflow at the upper part of the channel is smaller is avoided, the difference of gas density caused by the temperature difference is reduced, the airflow disorder caused by the gas diffusion due to the gas density difference in the non-transverse flow direction is reduced as much as possible, the airflow disorder at the transverse direction at the upper part of the channel is minimized, the uniformity of the gas flow velocity and the flow direction is improved, the shake of spandex in the channel is reduced, the ultra-soft spandex with lower modulus and the spandex which is slower in evaporation and easy to shape fixing and shake are reduced, and therefore, the doubling in the limited channel space is avoided, the functionalized spandex can be spun with high density, and the production efficiency of the functionalized spandex is improved. Meanwhile, the air pressure at the upper part of the channel is increased, so that the speed of the whole air flow at the upper part is increased, more solvent is taken away from the raw liquid trickle in the upper channel area in the flowing process of the air, and the accumulation of the solvent caused by the overhigh concentration of the solvent in the lower channel area can be avoided, thereby reducing the risk of solvent explosion of the gas in the lower channel. The upper duct and the lower duct are leveled on the side wall of one side of the air return net so as to ensure the stable direction of the air flow, if the side walls of the upper duct and the lower duct are not leveled at the position, the air flow is blown from the upper air inlet direction, and part of the air flow is sucked from the lower duct, and the air flows in two different directions meet to form vortex, so that the air flow in the duct is disordered, the spinning quality is influenced, and therefore the lower duct is required to be narrowed by the mode of deviating from the inner wall of the upper air inlet net side.
Furthermore, the width of the lower channel between the upper air inlet net and the upper air return net is 40% -90% of that of the upper channel.
The width of the lower channel is too narrow, so that the air pressure of the upper channel is too large, the gas flow velocity is increased, the air flow is disturbed, the thin flow of the stock solution is further shaken, and the spinning is adversely affected; the over-width of the lower shaft does not improve the uniformity of the airflow of the upper shaft, so that the suitable width of the lower shaft is 40-95%, preferably 60-90%, and more preferably 75-90% of the width of the upper shaft.
Further, the upper air inlet system is connected with a gas heating device.
Furthermore, the upper air return system and the lower air return system are connected with a solvent recovery device.
Further, the number of spinning holes of the spinneret is 60 to 200, preferably 60 to 150.
When the channel provided by the invention is used for spinning, the spinning density of spandex can be improved, so that the number of holes of a spinneret plate can be increased.
Furthermore, the height of the upper shaft is 0.8-3 m, and the height of the lower shaft is 11-15m.
The height is the length of the channel along the direction of the spandex yarn shaft.
Furthermore, the width of the upper shaft is 60-80cm.
A spandex spinning method for preventing doubling is characterized in that the air spinning channel is adopted for spinning.
The spinning solution of the functional spandex has high viscosity, and doubling can easily occur in the spinning process.
Further, the spinning method adopts air as spinning gas.
Further, the temperature of the spinning gas is 235-280 ℃.
Too high spinning gas temperature can cause the spandex silk to turn yellow and degrade, and too low temperature can cause incomplete solvent evaporation and excessive residue.
Furthermore, the air inlet volume of the upper air inlet system is 9-18Nm 3 The air return rate of the upper air return system is 6.3-13.5Nm3/min, and the air return rate of the lower air return system is 2.7-4.5Nm 3 /min。
Has the advantages that:
according to the air spinning channel for spandex, the side wall of the lower channel on the air inlet side moves towards the return air side, so that the speed and the uniformity of transverse air flow at the upper part of the channel are effectively improved, the shake of spandex yarns in the channel is reduced, yarn doubling is avoided in a limited channel space, functionalized spandex yarns can be spun at high density, and the production efficiency of the functionalized spandex yarns is improved.
Drawings
FIG. 1 is a schematic structural view of an air spinning shaft for spandex of the present invention
FIG. 2 is a schematic view showing the gas flow direction of a conventional air spinning shaft for spandex
FIG. 3 is a schematic view showing the direction of gas flow of the air spinning shaft for spandex of the present invention
FIG. 4 is a contour plot of gas flow velocity for a conventional air spinning shaft for spandex
FIG. 5 is a gas flow velocity contour plot for an air spinning shaft for spandex of the present invention
The reference numerals are explained below:
1. an upper air inlet system 2, an upper air return system 3, an upper channel 4, a lower channel 5, a lower air return system 11, an upper air inlet static pressure chamber 12, an upper air inlet net 21, an upper air return static pressure chamber 22, an upper air return net 41, a left side wall 42 of the lower channel, and a side wall of the lower channel
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be further clearly and completely described below by using texts and/or with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. In the interest of clarity and conciseness, not all features of an actual implementation are described in the specification.
It is also noted herein that elements and features depicted in one drawing or one embodiment of the invention may be combined with elements and features depicted in one or more other drawings or embodiments to avoid obscuring the invention with unnecessary detail, and that only device structures and/or processing steps germane to aspects consistent with the invention are depicted in the drawings and description and representations and descriptions of components and processes not germane to the invention that are known to those of ordinary skill in the art are omitted.
For convenience of description, the terms "upper", "lower", "left", "right", "horizontal" and "vertical" are used in the following description based on the relative positions of fig. 1 unless otherwise specified.
Example 1
The embodiment relates to an air spinning duct for spandex spinning, which comprises an upper air inlet system 1, an upper air return system 2, an upper duct 3, a lower duct 4 and a lower air return system 5, wherein the upper air inlet system 1 and the upper air return system 2 are oppositely arranged on the left side and the right side of the upper duct as shown in fig. 1, the upper air inlet system 1 comprises an upper air inlet static pressure chamber 11 and an upper air inlet net 12, and the upper air return system comprises an upper air return net 22 and an upper air return static pressure chamber 21, as shown in fig. 1. The upper duct portion of the present embodiment is an upper duct 3 and a lower duct 4, wherein the top of the upper duct 3 is connected to a spinneret (the spinneret is not shown in the figure), the bottom of the upper duct 3 is communicated with the lower duct 4, and the bottom of the lower duct 4 is provided with a lower return air system 5. In this embodiment, the lengths of the upper duct 3, the upper air inlet net 12 and the upper air return net 22 in the vertical direction are equal, the width of the upper duct 3 in the left-right direction is the same as that of the conventional duct, the width of the lower duct 4 is smaller than that of the upper duct 3, and the right sidewall 42 of the lower duct 4 is flush with the upper air return net 22 in the vertical direction, that is, the left sidewall 41 of the lower duct is shifted to the right in comparison with the position of the conventional duct. In this embodiment, the upper shaft has a width of 75cm and a height of 0.8m, and the lower shaft has a width of 55cm and a height of 13m. The air inlet of the upper air inlet system 1 is connected with the gas heating device, and the air outlets of the upper air return system 2 and the lower air return system 5 are connected with the solvent recovery system.
In the working process of the shaft, the polyurethane solution is sprayed out from a spinneret plate positioned at the top of an upper shaft 3 to form a raw liquid trickle, the raw liquid trickle sequentially passes through the upper shaft 3 and a lower shaft 4, and in the process of passing through the shaft, as a solvent (such as DMAc or DMF) in the polyurethane solution is gradually volatilized under the action of high-temperature air flow in the shaft, the raw liquid trickle is gradually changed from liquid state to solid spandex fiber in the process from the upper shaft 3 to the lower shaft 4, and the polyurethane fiber is wound into spandex cake by a winding device after passing through a shaft outlet at the bottom of the lower shaft 4.
From the above description, it can be seen that the shaft has the function of converting the polyurethane solution into spandex fiber and taking away the solvent in the polyurethane solution in the process, which is mainly realized by the high-temperature air flow in the shaft. In the air shaft, air is used as high-temperature gas to flow in the shaft to carry away the solvent in the thin flow of the stock solution. The gas flow direction of the conventional air shaft is shown in fig. 2, the heated gas enters an upper air inlet static pressure chamber 11 from a gas heating device, then when the gas passes through an upper air inlet net 12, the upper air inlet net 12 uniformly disperses the gas flow to an upper shaft 3, a part of the gas flow is vertically blown to a raw liquid trickle rightwards in the upper shaft 3 to carry away most of solvent in the raw liquid trickle, and the part of the gas flow carries the solvent to flow to a solvent recovery device through an upper return air net 22 and an upper return air static pressure chamber 21; the other part of the airflow in the upper shaft 3 enters the lower shaft 4 through the bottom of the upper shaft 3, flows downwards in the lower shaft 4 along the same direction as the spandex fiber, takes away the residual solvent in the spandex fiber, and then flows to the solvent recovery device through a lower air return system 5. In the process, the air flow in the upper shaft 3 flowing from the upper air inlet system 1 to the upper air return system 2 accounts for most of the air flow in the shaft because the air in the shaft contains oxygen and the temperature in the shaft is higher, while the solvent of the polyurethane solution is usually DMAc or DMF, which is a flammable and explosive gas, if the volatilized solvent is accumulated in the shaft and is easy to explode, and the content of the solvent in the air is controlled, so that the explosion can be avoided. Therefore, when a chimney is designed, the air flow in the upper chimney 3 is large, the air flow in the lower chimney 4 is small, most of the solvent is recovered through the upper air return system 2, the amount of the solvent in the lower chimney 4 can be reduced, the volatilized solvent is prevented from being accumulated in the lower chimney 4, and accordingly explosion is avoided.
In the actual working process, the air flow in the shaft is not uniform. In the conventional air shaft as shown in fig. 2 and 4, the widths of the upper shaft and the middle and lower shafts are the same, the air pressure is higher at the lower part of the upper air inlet net, the negative pressure at the lower part of the upper air inlet net is higher, so that the air flow in the upper shaft is short-circuited, the gas flow speed at the upper part of the upper shaft is lower than that at the lower part of the upper shaft, and accordingly spandex yarns swing in the width direction.
As shown in fig. 3 and 5, since the width of the upper duct 3 in the left-right direction is the same as that of the conventional duct, and the position of the left sidewall 41 of the lower duct is shifted to the right compared to that of the conventional duct in this embodiment, it can be seen from fig. 5 that the wind pressure of the upper duct 3 is increased due to the narrowed size of the lower duct 4, the flow velocity of the airflow at the uppermost portion of the upper duct 3 is increased, and the region where the local airflow velocity is too fast is not generated, so that the airflow turbulence in the upper portion of the duct 3 in the lateral direction is minimized. As can be seen by comparing fig. 2 and 4 with fig. 3 and 5, respectively, the gas flow velocity and flow direction uniformity of the cross gas flow at the top of the upper shaft 3 of the improved shaft of the present invention is improved compared to conventional air shafts. Therefore, when the channel of the embodiment is used for spinning spandex, the shake of the spandex yarn in the channel can be reduced, and the shake of the ultra-soft spandex yarn with lower modulus and the easily-shaped spandex yarn with slower evaporation is reduced, so that doubling is avoided in a limited channel space, the functionalized spandex yarn can be spun in a high-density manner, and the production efficiency of the functionalized spandex yarn is improved.
Meanwhile, the air pressure at the upper part of the channel is increased, so that the speed of the whole air flow at the upper part is increased, more solvent is taken away from the raw liquid trickle in the upper channel area in the flowing process of the air, the solvent can be prevented from being accumulated in the lower channel area, and the effect of reducing the solvent explosion risk of the air in the lower channel is achieved. Go up the return air net and down the chimney and flush at the lateral wall of return air net one side in order to guarantee that the direction of air current is stable, if the lateral wall of upper and lower chimney should not flush in this department then can cause the air current except that the part blows from last air inlet direction, still can have partial air current to follow down the chimney suction and come, the swirl can appear in meeting of the air current of two kinds of not equidirectionals, and then cause the air current in the chimney to be disorderly, influence spinning quality, consequently down the chimney should narrow down the chimney width with the mode of the inner wall of skew upper air inlet net side.
Example 2
The embodiment relates to a spandex spinning method for preventing doubling, which adopts the air spinning channel described in the embodiment 1 to spin.
Firstly, starting an air heating device and an air supply device, heating the air to 243 ℃, and enabling the heated air to enter an upper shaft 3 through an upper air inlet net 12 of an upper air inlet system 1, wherein the air inlet net is 13Nm of the upper air inlet system 1 3 And/min, hot air flows in the upper shaft 3, a part of the hot air flows transversely through the upper shaft 3 to flow into the upper air return system 2 through the upper air return net 22, and a part of the hot air flows downwards to the lower shaft 4 and finally flows to the lower air return system 5. Wherein the return air quantity of the upper return air system 2 is 7Nm 3 Min, the return air quantity of the lower return air system 5 is 6Nm 3 /min。
After the channel is preheated, spraying a raw liquid trickle by a spinneret plate arranged at the top of the upper channel 3, wherein the solid content of the raw liquid trickle is 34 percent, and the flow rate of the spinneret plate is 7cm 3 And/min, the raw liquid trickles pass through an upper shaft 3 and a lower shaft 4, the solvent in the raw liquid trickles is taken away by hot air under the action of the hot air in the shafts, the liquid state is changed into solid spandex yarns, and the spandex yarns leave the shafts from the bottom of the lower shaft 4 and are reeled into cakes by a reeling machine. Meanwhile, the hot air with the solvent recovered by the upper air return system 2 and the lower air return system 5 flows to the solvent recovery device, and the solvent is recovered and reused by the solvent recovery device.
Claims (9)
1. An air spinning channel for spandex comprises an upper air inlet system, an upper air return system, an upper channel, a lower channel and a lower air return system, wherein the upper air inlet system and the upper air return system are oppositely arranged on two sides of the upper channel, the upper air inlet system comprises an air inlet static pressure chamber and an air inlet net, the upper air return system comprises an upper air return net and an upper air return static pressure chamber, the top of the upper channel is connected with a spinneret plate, and the bottom of the upper channel is communicated with the lower channel.
2. The air spinning shaft for spandex according to claim 1, characterized in that the width of the lower shaft between the upper air inlet net and the upper return air net is 40% -90% of that of the upper shaft.
3. An air spinning shaft for spandex according to claim 1, characterized in that a gas heating device is connected to the upper air intake system.
4. The air spinning shaft for spandex according to claim 1, wherein the upper air return system and the lower air return system are connected with a solvent recovery device.
5. An air spinning shaft for spandex according to claim 1, wherein the number of spinning holes of the spinneret is 60-200.
6. An air spinning shaft for spandex according to claim 1, wherein the length of the upper shaft along the axial direction of the spandex is 0.8-3 m, and the length of the lower shaft along the axial direction of the spandex is 11-15m.
7. A spandex spinning method for preventing doubling, characterized in that spinning is carried out using an air spinning shaft as claimed in any one of claims 1 to 6.
8. The spandex spinning method for preventing doubling according to claim 7, wherein the temperature of air as spinning gas is 235 to 280 ℃.
9. The spandex spinning method for preventing doubling as claimed in claim 7, wherein the amount of air supplied to the upper air supply system is 9-18Nm 3 Min, the return air quantity of the upper return air system is 6.3-13.5Nm 3 The return air quantity of the lower return air system is 2.7-4.5Nm 3 /min。
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| CN202111682457.1A CN114277453B (en) | 2021-12-31 | 2021-12-31 | Air spinning channel for spandex and spinning method |
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| CN202111682457.1A CN114277453B (en) | 2021-12-31 | 2021-12-31 | Air spinning channel for spandex and spinning method |
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| CN114277453B true CN114277453B (en) | 2023-03-14 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1457939A (en) * | 1973-10-04 | 1976-12-08 | Barmag Barmer Maschf | Filament duct for treating melt-spun filaments |
| JPS59163410A (en) * | 1983-03-04 | 1984-09-14 | Toray Ind Inc | Melt spinning of synthetic fiber |
| JP2003147636A (en) * | 2001-11-06 | 2003-05-21 | Toyobo Co Ltd | Polyurethane elastic yarn and method for producing the same |
| WO2007054375A1 (en) * | 2005-11-11 | 2007-05-18 | Uhde Inventa-Fischer Gmbh | Device for producing melt-spun filaments |
| CN101235550A (en) * | 2008-02-01 | 2008-08-06 | 江阴中绿化纤工艺技术有限公司 | 48 head square spinning path |
| JP2013053398A (en) * | 2011-08-11 | 2013-03-21 | Toyama Filter Tow Co Ltd | Dry spinning method |
| CN206428354U (en) * | 2016-12-28 | 2017-08-22 | 无锡市新建化纤有限公司 | A kind of spinning shaft |
| CN206799802U (en) * | 2016-11-28 | 2017-12-26 | 烟台泰和新材料股份有限公司 | Path air compartment on a kind of modified spandex |
-
2021
- 2021-12-31 CN CN202111682457.1A patent/CN114277453B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1457939A (en) * | 1973-10-04 | 1976-12-08 | Barmag Barmer Maschf | Filament duct for treating melt-spun filaments |
| JPS59163410A (en) * | 1983-03-04 | 1984-09-14 | Toray Ind Inc | Melt spinning of synthetic fiber |
| JP2003147636A (en) * | 2001-11-06 | 2003-05-21 | Toyobo Co Ltd | Polyurethane elastic yarn and method for producing the same |
| WO2007054375A1 (en) * | 2005-11-11 | 2007-05-18 | Uhde Inventa-Fischer Gmbh | Device for producing melt-spun filaments |
| CN101235550A (en) * | 2008-02-01 | 2008-08-06 | 江阴中绿化纤工艺技术有限公司 | 48 head square spinning path |
| JP2013053398A (en) * | 2011-08-11 | 2013-03-21 | Toyama Filter Tow Co Ltd | Dry spinning method |
| CN206799802U (en) * | 2016-11-28 | 2017-12-26 | 烟台泰和新材料股份有限公司 | Path air compartment on a kind of modified spandex |
| CN206428354U (en) * | 2016-12-28 | 2017-08-22 | 无锡市新建化纤有限公司 | A kind of spinning shaft |
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