CN112959541B - Production method of nylon fiber - Google Patents
Production method of nylon fiber Download PDFInfo
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- CN112959541B CN112959541B CN202110323033.XA CN202110323033A CN112959541B CN 112959541 B CN112959541 B CN 112959541B CN 202110323033 A CN202110323033 A CN 202110323033A CN 112959541 B CN112959541 B CN 112959541B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/68—Regeneration of the filtering material or filter elements inside the filter by means acting on the cake side involving movement with regard to the filter elements
- B01D46/681—Regeneration of the filtering material or filter elements inside the filter by means acting on the cake side involving movement with regard to the filter elements by scrapers, brushes or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/04—Cleaning by suction, with or without auxiliary action
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
- B29B13/065—Conditioning or physical treatment of the material to be shaped by drying of powder or pellets
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/04—Heating arrangements using electric heating
- F26B23/06—Heating arrangements using electric heating resistance heating
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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 invention discloses a production method of nylon fiber, which comprises the following steps: s1 mixing, S2 melting, S3 dynamic mixing, S4 spinning, S5 air-blowing cooling, S6 cluster oiling and S7 winding forming, and is characterized in that: the master batch drier comprises three steps when drying master batches, wherein the master batch drier is used for stirring and air-drying in an air-drying hopper, exhausting and dedusting the master batch drier simultaneously, removing master batch dust generated during stirring by using an air filter, enabling the air-dried master batches subjected to stirring to fall into a heating hopper for heating and drying, and enabling the heat-dried master batches to fall into a material storage cavity for heat preservation and storage and to be used for outputting and mixing with slices at any time. The production method can enable the nylon finished product to have specific functions or colors, is more beneficial to the richness of enterprise varieties, can ensure that master batches meet the requirements of a drying process, can remove dust generated by stirring friction, can prevent moisture regain, and can ensure the performance of subsequent spinning.
Description
Technical Field
The invention relates to a production method of chemical fibers, in particular to a production method of nylon fibers.
Background
The nylon is a chemical fiber commonly used in life, and is prepared by slicing raw materials, performing processes such as melt extrusion and the like to form nylon fibers. In order to make chinlon have specific function or specific color, master batches, such as master batches with various functions like antibacterial master batches or various master batches, are added in spinning production, and the master batches are mixed with chips before being melt-extruded by a screw extruder and then are melt-extruded together with the chips. The moisture content of the freshly purchased masterbatch is higher, and for storage reasons, the moisture content of the masterbatch affects subsequent spinnability, so that the masterbatch needs to be dried before mixing with the dry slices during production. Existing drying processes typically rely on masterbatch dryers such as: 2012200857463 color master batch drying device, the device adopts hot air drying, and when dry, stir the master batch by stirring rake, in order to improve dry efficiency, this kind of mode has technical problem a lot of, if adopt the air-dry mode to spend long time alone, drying efficiency is low, simultaneously, in the stirring process of master batch to the stirring rake, the master batch produces the dust with the filter screen, with the friction of stirring rake easily, technical personnel in the field know, when the section is carried in the pulsed, at first will reduce the friction of section and conveyer pipe wall as far as possible, with the powder volume that just will reduce in the section, in order to ensure the spinning performance of sequent, the master batch is also so, it is not advisable to produce more dust in master batch drying device. However, the masterbatch dryer disclosed in patent 2014203269890 is only in contact with hot air by falling, so that the drying efficiency is significantly low, and the process requirements are difficult to meet, which is disadvantageous to enterprises. On the other hand, the dried master batch has a technical problem of being easily damp-proof if it is temporarily stored in a container having a relatively low temperature, and the improvement of the present patent is made based on the technical problem.
Disclosure of Invention
The purpose of the invention is: the production method of the nylon fiber can ensure the drying effect of the master batch, prevent the master batch from getting damp and reduce dust, thereby realizing better addition of the master batch and ensuring the process requirement.
The invention designs a production method of nylon fiber, which comprises the following steps:
s1 mixing: adding the dried slices and the master batches dried by the master batch dryer into a mixing device for mixing;
melting of S2: the slices mixed by the mixing device and the master batches enter a screw extruder together for melt extrusion to obtain a spinning melt;
s3 dynamic mixing: the spinning melt flows out of the screw extruder and then enters a dynamic mixing device for dynamic mixing;
s4 spinning: conveying the dynamically mixed spinning melt to a spinning box body, and conveying the spinning melt to each spinning assembly through a metering pump for spinning to generate fibers;
s5 air blowing cooling: and (3) adopting a side blowing device to blow and cool the fibers:
s6 bundling and oiling: bundling and oiling fibers;
s7 winding and forming: the tows after oiling are stretched and pre-meshed, and are finally wound and formed by a winding machine, and the method is characterized in that: the master batch drier comprises three steps when drying master batches, wherein the master batch drier is used for stirring and air-drying in an air-drying hopper, exhausting and dedusting the master batch drier simultaneously, removing master batch dust generated during stirring by using an air filter, enabling the air-dried master batches subjected to stirring to fall into a heating hopper for heating and drying, and enabling the heat-dried master batches to fall into a material storage cavity for heat preservation and storage and to be used for outputting and mixing with slices at any time.
The further scheme of the invention is as follows:
in the S2 melting step, the number of heating zones of the screw extruder is 5, wherein the temperature of the first zone is 245-.
The spinning beam temperature 263-268 ℃ in the S4 spinning step.
In the S5 air-blowing cooling step, the temperature of cross air-blowing is 18-20 ℃, and the humidity is 65-68%.
S6 bundling and oiling: the oil feeding amount is 1.0-1.2%;
in the step of S7 winding and forming: the winding speed is 4200-4500 m/min.
The master batch dryer comprises a cylinder, wherein a feeding pipe is arranged at the top of the cylinder, a discharging pipe is arranged at the bottom of the cylinder, the cylinder is internally provided with an air drying hopper and a heating hopper, the whole body of the air drying hopper is provided with an air hole, an agitating paddle is arranged in the air drying hopper, a driving shaft of the agitating paddle is in transmission connection with a motor positioned at the top of the cylinder, the outer side of the air drying hopper is provided with an air cover, the inner surface of the air cover is an inclined plane matched with the shape of the air drying hopper, and air outlet grooves are fully distributed on the inclined plane; the heating hopper is positioned below the air drying hopper, the upper end surface of the heating hopper is provided with a conical guider through a rod body, and the lower end surface of the heating hopper is provided with a heating element; the area between the heating hopper and the bottom of the cylinder body is the material storage cavity; the master batch dryer also comprises an air inlet pipe and an air outlet pipe, wherein one end of the air inlet pipe is connected with an air inlet machine, the other end of the air inlet pipe is connected with a fan cover, and a heating jacket is arranged on the air inlet pipe; a dust hood is arranged above the air drying hopper, the air outlet pipe is connected with the dust hood, and an air filter and an exhaust fan are arranged on the air outlet pipe; the inlet pipe, discharging pipe, air-supply line, play tuber pipe and air-dry all are equipped with the valve on fighting and the outlet pipe that heats the fill.
The feed pipe is arranged at the eccentric position of the top of the cylinder body, and the guide device is arranged in the cylinder body to guide the master batches falling from the feed pipe into the air drying hopper.
The first step of drying the master batch by the master batch dryer has a step of weighing an air drying hopper.
The air drying bucket is characterized in that an annular seat is arranged in the barrel, a plurality of guide rods are arranged on the upper end face of the annular seat, the air drying bucket is arranged in the annular seat in a penetrating mode, an outward-turned opening edge of the air drying bucket is used for the guide rods to penetrate through, and a weighing sensor is arranged between the opening edge of the air drying bucket and the annular seat.
The production method of the nylon fiber designed by the invention adopts a mode of adding the master batch into the slices for production, so that the nylon finished product has specific functions or colors, and is more beneficial to the richness of enterprise varieties. The special master batch drying method is adopted, so that the master batches can meet the requirements of the drying process, dust generated by stirring friction can be removed, the subsequent spinning performance is ensured, the dried master batches are stored in the material storage cavity with the heat preservation effect, the moisture regain can be effectively prevented, and the product quality of the nylon can be effectively ensured.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification:
FIG. 1 is a flow chart of the apparatus used in the process for producing nylon fibers described in example 1;
FIG. 2 is a schematic external view of the master batch dryer described in example 1;
FIG. 3 is a schematic diagram of the master batch dryer described in example 1;
FIG. 4 is an enlarged view at A in FIG. 3;
FIG. 5 is a schematic external view of the master batch dryer described in example 5;
FIG. 6 is a schematic diagram of the master batch dryer described in example 6;
FIG. 7 is an enlarged view of the air filter of FIG. 6;
FIG. 8 is a top view of the back cover plate;
FIG. 9 is a cross-sectional view of the edge of the back panel with the flap horizontal;
FIG. 10 is a cross-sectional view of the edge of the back-cover with the flap slouched;
reference numbers: the device comprises a master batch dryer 1, a mixing device 2, a screw extruder 3, a dynamic mixing device 4, a spinning box 5, a side blowing device 6, a winding machine 7, a dry slice bin 81, a master batch bin 82 and a metering screw 9;
Detailed Description
The invention is further described by way of example with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, the method for producing nylon fiber described in this embodiment includes the following steps:
s1 mixing: adding the dried slices and the master batches dried by the master batch dryer 1 into a mixing device 2 for mixing; the master batch adopts color master batch;
melting of S2: the slices mixed by the mixing device 2 and the master batches enter a screw extruder 3 together for melt extrusion to obtain a spinning melt; the screw extruder has 5 heating zones, wherein the temperature of the first zone is 245 ℃, the temperature of the second zone is 250 ℃, the temperature of the third zone is 260 ℃, the temperature of the fourth zone is 265 ℃ and the temperature of the fifth zone is 260 ℃;
s3 dynamic mixing: the spinning melt flows out of the screw extruder 3 and then enters the dynamic mixing device 4 for dynamic mixing;
s4 spinning: conveying the dynamically mixed spinning melt to a spinning box body 5, and conveying the dynamically mixed spinning melt to each spinning assembly through a metering pump for spinning to generate fibers; the temperature of the spinning beam 5 is 263 DEG C
S5 air blowing cooling: and (3) adopting a side blowing device 6 to blow and cool the fibers: the temperature of the cross air blow is 18 ℃, and the humidity is 65%;
s6 bundling and oiling: bundling and oiling fibers; the oil feeding amount is 1.0 percent;
s7 winding and forming: stretching and pre-meshing the oiled tows, and finally winding and forming the tows by a winding machine 7 at the winding speed of 4200 m/min;
the master batch drier 1 comprises three steps of stirring and air-drying in an air-drying hopper 104 in the first step, exhausting air and removing dust from the master batch drier 1 at the same time, removing master batch dust generated during stirring by using an air filter 120, dropping the stirred and air-dried master batch into a heating hopper 105 for heating and drying in the second step, and dropping the heated and dried master batch into a material storage cavity 114 for heat preservation and storage and is used for outputting and mixing with slices at any time; the master batch dryer 1 has the following structure:
as shown in fig. 2, the master batch dryer 1 includes a cylinder 101, a feeding pipe 102 is arranged at the top of the cylinder 101, a discharging pipe 103 is arranged at the bottom of the cylinder 101, the cylinder 101 is internally provided with the air drying hopper 104 and the heating hopper 105, the air drying hopper 104 is provided with an air hole in the whole body, the air drying hopper 104 is internally provided with a stirring paddle 106, a driving shaft of the stirring paddle 106 is in transmission connection with a motor 107 positioned at the top of the cylinder 101, and the motor 107 can drive the stirring paddle 106 to rotate after rotating, so that mother granules in the air drying hopper 104 can be stirred; as shown in fig. 3 and 4, a fan housing 108 is arranged outside the air drying hopper 104, the inner surface of the fan housing 108 is an inclined plane 109 matched with the shape of the air drying hopper 104, and air outlet grooves 110 are fully distributed on the inclined plane 109, so that hot air blown out from the fan housing 108 is better blown to the air drying hopper 104, air holes are formed in the whole body of the air drying hopper 104, and the hot air can pass through the air holes to dry master batches, which are in a stirring state, in the interior, by the hot air, so that the water content of the master batches is reduced; the heating hopper 105 is positioned below the air drying hopper 104, the upper end face of the heating hopper 105 is provided with a conical guide 112 through a rod body 111, the lower end face of the heating hopper 105 is provided with a heating element 113, so that the heating hopper 105 has a heating function, the conical guide 112 can better distribute the master batches falling from the air drying hopper to the periphery, and the master batches are more uniformly heated in the heating hopper 105; the area between the heating hopper 105 and the bottom of the cylinder 101 is the storage cavity 114, and the master batches after passing through the heating hopper 105 can be stored in the storage cavity 114 and are used for being output downwards to be mixed with dry slices at any time. The master batch dryer 1 further comprises an air inlet pipe 115 and an air outlet pipe 116, one end of the air inlet pipe 115 is connected with an air inlet machine 117, the other end of the air inlet pipe 115 is connected with a fan cover 108, and a heating jacket 119 is arranged on the air inlet pipe 115; a dust hood 127 is arranged above the air drying bucket 104, the air outlet pipe 116 is connected with the dust hood 127, and an air filter 120 and an exhaust fan 118 are arranged on the air outlet pipe 116; valves are arranged on the feed pipe 102, the discharge pipe 103, the air inlet pipe 115, the air outlet pipe 116, and outlet pipes of the air drying bucket 104 and the heating bucket 105;
the feed pipe 102 is placed at an eccentric position on the top of the drum 101 so that the motor 107 can be positioned at the center of the top for stirring, and a guide 128 is provided in the drum 101 to guide the master batch falling from the feed pipe 102 into the air drying hopper 104.
In this embodiment, the first step of drying the master batch by the master batch dryer includes a step of weighing the air drying hopper. The inside of the cylinder 101 is provided with an annular seat 124, the upper end surface of the annular seat 124 is provided with a plurality of guide rods 125, the air drying bucket 104 is arranged in the annular seat 124 in a penetrating manner, the outward-turned opening edge of the air drying bucket 104 is used for the guide rods 125 to pass through, a weighing sensor 126 is arranged between the opening edge of the air drying bucket 104 and the annular seat 124, the design is used for controlling the air drying bucket 104 to stop feeding when reaching the preset weight, and what needs to be explained is that: if the air drying hopper 104 does not have a weighing function, the amount of feed can be controlled by means of controlling the feed time.
During production, master batches in the upper master batch bin 82 enter the master batch dryer 1 through the feeding pipe 102 and fall into the air drying hopper 104, the motor 107 works to drive the stirring paddle 106 to rotate, the air inlet machine 117 and the heating jacket 119 work to form hot air blown inwards, the hot air is blown upwards through the air outlet groove 110 on the inner surface of the air cover 108 to air-dry the stirred master batches in the air drying hopper 104 and take away most of moisture in the master batches, the exhaust fan 118 works to suck air at the top in the barrel 101 outwards through the dust collection cover 127, master batch dust generated by stirring in the air is filtered in the air filter 120, and clean air is discharged outwards; when the weighing sensor 126 weighs the air drying bucket 104 to reach a preset weight, feeding is stopped, air drying is performed for a period of time (the time can be selected by a person skilled in the art according to actual conditions, such as 5 minutes), then hot air stops, a valve on an outlet pipe of the air drying bucket 104 is opened to discharge the master batches in the air drying bucket 104 downwards, the master batches enter the heating bucket 105 under the distribution action of the conical guide 112 and are heated in the heating bucket, after heating and drying are performed for a period of time (the time can be selected by a person skilled in the art according to actual conditions, such as 4 minutes) in the heating bucket 105, the valve on the outlet pipe of the heating bucket 105 is opened, the master batches in the heating bucket 105 are stored in the storage cavity 114 and are ready to be output downwards at any time, and the dried slices and the master batches enter the mixing device 2 according to a proportion under the action of the metering screws 9 respectively to be mixed.
The special master batch drying method combines the advantages of hot air drying and heating drying, master batches with higher water content at the initial drying stage can be effectively dried by hot air, and moisture is discharged; the heating bucket 105 is heated in a contact manner, the drying effect is improved, the heat of the heating bucket 105 comes from the heating element 113 on the bottom surface, the heating element 113 can be an electric heating pipe embedded on the bottom surface or heating wires distributed on the bottom surface, and because the heating element 113 is positioned at the top in the material storage cavity 114, the heating element 113 also provides heat for the material storage cavity 114, so that the internal air is heated, the material storage cavity 114 has a heat preservation effect, and the dried master batches can be effectively prevented from getting damp. The weighing sensor 126 can sense the grain feeding amount in the air drying hopper 104, and control the master grains entering the air drying hopper within the amount capable of ensuring the air drying efficiency; the two steps are cooperated, after the operation of the air drying bucket 104 is finished, the master batch enters the heating bucket 105, at the moment, the air drying bucket 104 can carry out the next air drying task, and the heating bucket 105 only needs to be emptied after the next air drying task is finished, so that the effective continuous production can be realized, and the master batch proportion required by the process is ensured. The method can effectively ensure the product quality of the chinlon.
The nylon fiber prepared by the embodiment has the advantages of 4.11cN/dtex of breaking strength, 27.1% of elongation at break, 6.1% of coefficient of variation of breaking strength, 9.2% of coefficient of variation of elongation at break, 1.18% of yarn evenness uniformity and good performance.
Example 2:
the production method of nylon fiber described in this example is different from example 1 in that:
in the melting step of S2, the temperature of the first zone, the temperature of the second zone, the temperature of the third zone, the temperature of the fourth zone and the temperature of the fifth zone of the screw extruder are 250 ℃, 260 ℃, 268 ℃ and 268 ℃ respectively.
The spinning beam 5 temperature in the S4 spinning step was 268 ℃.
In the S5 air blowing cooling step, the temperature of cross air blowing is 20 ℃ and the humidity is 68%.
S6 bundling and oiling: the oil feeding amount is 1.2%;
in the step of S7 winding and forming: the winding speed was 4500 m/min.
The nylon fiber prepared by the embodiment has the advantages of 4.12cN/dtex of breaking strength, 27.2% of elongation at break, 6.0% of coefficient of variation of breaking strength, 9.1% of coefficient of variation of elongation at break, 1.19% of yarn evenness uniformity and good performance.
Example 3:
the production method of nylon fiber described in this example is different from example 1 in that: in the melting step of S2, the temperature of the first zone, the temperature of the second zone, the temperature of the third zone, the temperature of the fourth zone and the temperature of the fifth zone of the screw extruder are 248 ℃, 258 ℃, 265 ℃, 268 ℃ and 265 ℃.
The spinning beam 5 temperature in the S4 spinning step was 263 ℃.
In the S5 air-blowing cooling step, the temperature of cross air-blowing is 19 ℃ and the humidity is 66%.
S6 bundling and oiling: the oil feeding amount is 1.1%;
in the step of S7 winding and forming: the winding speed is 4300 m/min.
The nylon fiber prepared by the embodiment has the advantages of 4.10cN/dtex of breaking strength, 27.3% of elongation at break, 6.0% of coefficient of variation of breaking strength, 9.0% of coefficient of variation of elongation at break, 1.19% of yarn evenness uniformity and good performance.
Example 4:
the production method of nylon fiber described in this example is different from example 1 in that: in the melting step of S2, the temperature of a first zone, the temperature of a second zone, the temperature of a third zone, the temperature of a fourth zone and the temperature of a fifth zone of a screw extruder are 250 ℃, 258 ℃, 265 ℃ and 268 ℃ respectively.
The spinning beam 5 temperature in the S4 spinning step was 264 ℃.
In the S5 air-blowing cooling step, the temperature of cross air-blowing is 19 ℃ and the humidity is 67%.
S6 bundling and oiling: the oil feeding amount is 1.1%;
in the step of S7 winding and forming: the winding speed was 4400 m/min.
The nylon fiber prepared by the embodiment has the advantages of 4.10cN/dtex of breaking strength, 27.2% of elongation at break, 6.0% of coefficient of variation of breaking strength, 9.0% of coefficient of variation of elongation at break, 1.20% of yarn evenness uniformity and good performance.
Example 5
In the above embodiment, hot air is directly discharged, and in order to improve the utilization rate of circulating hot air, the master batch dryer 1 periodically uses circulating hot air when stirring and air-drying.
The master batch dryer 1 is different from the example 1 in that: as shown in fig. 5, a circulation air pipe 121 is connected between an inlet of the air inlet fan 117 and an outlet of the air exhaust fan 118, a three-way valve one 122 is arranged at one end of the circulation air pipe 121 close to the air exhaust fan 118, and a three-way valve two 123 is arranged at one end close to the air inlet fan 117; the air drying of the master batch comprises two steps:
a1: the three-way valve I122 and the three-way valve II 123 work to enable the circulating air pipe 121 to be in a blocking state, the air inlet fan 117 directly enters air from the outside, and the exhaust fan 118 directly exhausts air to the outside; the operation is now substantially the same as in example 1, and can be used to expel most of the moist air during the initial drying;
a2: the three-way valve I122 and the three-way valve II 123 work to enable the circulating air pipe 121 to be in a communicated state, and hot air circulates among the air inlet fan 117, the barrel 101, the exhaust fan 118 and the circulating air pipe 121; at this time, the circulating hot air may be used with most of the humid air discharged, while the heating jacket 119 is lowered or closed at the right time to save electric power.
The circulating hot air scheme used in this example is also suitable for examples 2-4.
Example 6:
conventional air cleaner does not have the function of discharge master batch dust, need regularly unpack apart the maintenance, untimely maintenance influences air filter's efficiency and ability easily, makes to air exhaust smoothly, and then can disturb hot air drying's efficiency, therefore this company designs air cleaner into regularly can clear up the master batch dust automatically, and embodiment 1 difference is that air cleaner's structure is as follows:
as shown in fig. 6 and 7, the air filter includes a housing 130, a telescopic hood 131, a dust collecting hopper 132, a dust collecting tank 133 and a lifter 134, the housing 130 includes a top plate 135 and an outer wall 136 and an inner wall 137 which are continuous on four sides below the top plate 135, an inner flange 138 is arranged on the bottom surface of the outer wall 136 and connected with the bottom of the inner wall 137, a filter screen 139 is arranged in the middle of the inner wall 137, and an air extracting cavity 140 is formed between the outer wall 136 and the inner wall 137; an inlet pipeline 153 of the air filter 120 is arranged on the top plate 135 and communicated with a space defined by the inner wall 137, and an outlet pipeline 154 is arranged on the outer wall 136 and communicated with the suction cavity 140; the telescopic cover 131 is connected between the machine shell 130 and the dust collection hopper 132; the upper end surface of the dust hopper 132 is connected with a sealing bottom plate 141 through a support rod 152, as shown in fig. 8, four edges of the sealing bottom plate 141 are all provided with grooves 142, a rotating shaft 143 is arranged in the grooves 142, a turning plate 144 penetrates through the rotating shaft 143, the position of the rotating shaft 143 on the turning plate 144 is closer to the inner end of the turning plate 144 and is in an eccentric shape, the outer end of the turning plate 144 is provided with a cleaning brush 145, and the top of the inner end of the turning plate 144 is provided with an L-shaped piece 146; the side wall of the groove 142 is provided with a convex rib 147 for preventing the inner end of the turnover plate 144 from over deflection; the dust tank 133 is connected to a lower portion of the dust hopper 132, and the lifter 134 drives the dust hopper 132 to move up and down. The lifter 134 may employ an air cylinder.
Wherein, the outside of the dust collecting hopper 132 is provided with an anchor ear 148, the anchor ear 148 is provided with a horizontal extending transverse part 149, and the top of the lifting rod of the lifter 134 is connected with the bottom surface of the transverse part 149; the lifter 134 is arranged on the side surface of the cylinder 101, and the casing 130 is also arranged on the side surface of the cylinder 101 through the mounting frame 150; the side surface of the cylinder body is also provided with a guide rod 151, the guide rod 151 penetrates through the end part of the transverse part 149, the lifter 134 adopts an air cylinder, the air cylinder acts to push the transverse part 149 to stably lift on the guide rod 151, and simultaneously drives the dust hopper 132 and the dust collecting tank 133 which are connected into a whole to lift; obviously, the manner in which the lifter 134 drives the dust hopper 132 to ascend and descend is not limited thereto.
The air filter described in this embodiment is connected in series to the air outlet pipe 116, the exhaust fan 118 works to exhaust air outwards, the bottom sealing plate 141 is arranged at the bottom of the inner wall 137, and plays a main sealing role on the bottom surface of the region enclosed by the inner wall 137, and the turning plate is in a drooping shape due to the eccentric arrangement mode of the turning plate on the rotating shaft; after the exhaust fan 118 works, the outlet pipeline of the air filter 120 and the air extraction cavity 140 are under negative pressure, so that the air in the cylinder 101 enters between the inner walls 137 through the inlet pipeline of the air filter 120 after passing through the dust collection hood 127, enters the air extraction cavity 140 after being filtered by the filter screen 139, and is conveyed outwards through the outlet pipeline of the air filter 120 and the exhaust fan 118; because the suction cavity 140 is under negative pressure when the exhaust fan 118 works, the generated master batch dust is attached to the filter screen 139; in the gap of hot air drying, such as blanking of the air drying hopper 104, the air inlet machine and the blower stop working, at this time, the pressure in the air filter 120 is stable, the lifter 134 can drive the dust hopper 132 to go upwards, the dust hopper 132 drives the bottom sealing plate 141 to go upwards through the support rod 152, because the turning plate 144 on the bottom sealing plate 141 is drooping-shaped (as shown in fig. 10), the cleaning brush 145 cannot contact with the filter screen, the telescopic hood 131 is compressed, the bottom sealing plate 141 goes to the highest position, the L-shaped sheet 146 abuts against the top plate 135, under the action of the top plate 135, the L-shaped sheet 146 is straightened to be horizontal, the turning plate 144 is horizontal (as shown in fig. 9), the cleaning brush 145 contacts with the filter screen on the corresponding surface, the lifter 134 can drive the dust hopper 132 to go downwards, the dust hopper 132 drives the bottom sealing plate 141 to go downwards through the support rod 152, in the downward process, the turning plate 144 is horizontal, the cleaning brush 145 is tensioned, along with the descending of the bottom sealing plate 141, the cleaning brush 145 brushes off the master batch dust attached to the filter screen 139 until the master batch dust falls on the dust collection tank 133, because the cleaning brush 145 bears an upward reverse acting force when the bottom sealing plate 141 descends, the turning plate 144 cannot return to the drooping state again until the bottom sealing plate 141 falls below the inner wall 137, the reverse acting force borne by the cleaning brush 145 disappears, the turning plate 144 is drooping again, the repeatedly brushed master batch dust is accumulated in the dust collection tank 133 after being guided by the dust hopper, and the bin gate 155 at the bottom of the dust collection tank 133 can be periodically opened for cleaning, so that the master batch dust on the filter screen 139 can be timely cleaned off, and the ventilation capacity and the filtering capacity of the filter screen 139 can be ensured.
Wherein: a gap is formed between the bottom sealing plate 141 and the inner wall 137, and the requirement of the gap is as follows: when the bottom sealing plate 141 goes upwards, the cleaning brush 145 is not in contact with the inner wall 137 through the drooping-shaped turning plate, when the bottom sealing plate 141 goes downwards, the cleaning brush 145 is in contact with the inner wall 137 through the horizontal turning plate, enough reverse acting force can be provided by the filter screen 139 to prevent the drooping-shaped turning plate from drooping, the gap can be controlled to be 5-10 mm, the bottom sealing plate 141 can play a sealing role at the bottom as much as possible during working, and air pressure below the bottom sealing plate 141 is relatively stable.
The solution of the characteristic air filter used in this example is also suitable for examples 2 to 5.
Example 7:
this example describes a method for producing antibacterial nylon fiber, which is different from example 1 in that: the master batch is an antibacterial master batch prepared by blending and granulating nylon 6 slices and nano-silver phosphate, and the weight ratio of the slices to the antibacterial master batch is 100: 5 (other ratios may be selected by those skilled in the art).
The prepared nylon fiber has good antibacterial performance while maintaining the original excellent performance of the nylon, and can be prepared into various antibacterial fabrics.
In this embodiment, the masterbatch dryer and the drying method of embodiments 2-6 can also be used to produce the antibacterial nylon fiber of this embodiment.
Example 8:
this example describes a method for producing flame-retardant nylon fiber, which is different from example 1 in that: the master batch is flame-retardant master batch, and the flame-retardant master batch comprises the following components in parts by weight:
a slicing carrier, a functional powder, a dispersant, a coupling agent, an antioxidant, a heat stabilizer =81.5, 17, 0.2, 0.1, wherein: the slicing carrier is nylon-6 slices; the functional powder is prepared by drying and activating a phosphorus aromatic polyamide organic amine compound in an oven at 180 ℃; the dispersant is polymer wax; the coupling agent is SI900, the antioxidant is B215 and the heat stabilizer is C101; the flame-retardant master batch is prepared by mixing the materials and then melting and granulating the mixture by an extruder.
The prepared nylon fiber has good flame retardant property while maintaining the original excellent performance of nylon, and can be prepared into various flame retardant fabrics.
In this embodiment, the masterbatch dryer and the drying method of embodiments 2-6 can also be used to produce the antibacterial nylon fiber of this embodiment.
Example 9:
the production method of the nylon fiber described in the embodiment comprises the following steps:
s1 mixing: adding the dried slices and the master batches dried by the master batch dryer 1 into a mixing device 2 for mixing; the master batch adopts color master batch;
melting of S2: the slices mixed by the mixing device 2 and the master batches enter a screw extruder 3 together for melt extrusion to obtain a spinning melt;
s3 dynamic mixing: the spinning melt flows out of the screw extruder 3 and then enters the dynamic mixing device 4 for dynamic mixing;
s4 spinning: conveying the dynamically mixed spinning melt to a spinning box body 5, and conveying the dynamically mixed spinning melt to each spinning assembly through a metering pump for spinning to generate fibers;
s5 air blowing cooling: the fibers are cooled by blowing by a side blowing device 6;
s6 bundling and oiling: bundling and oiling fibers;
s7 winding and forming: stretching and pre-networking the oiled tows, and finally winding and forming the tows by a winding machine 7;
the master batch drier 1 comprises three steps when drying master batches, wherein the first step is to stir and air-dry in an air-drying hopper 104, and simultaneously perform air suction and dust removal on the master batch drier 1, an air filter 120 is used for removing master batch dust generated during stirring, the second step is to heat and dry the master batches after stirring and air-drying in a heating hopper 105, and the third step is to heat and dry the master batches after heating and drying in a material storage cavity 114 for heat preservation and storage and to be used for output and slicing mixing at any time, wherein each process parameter can be set by a person skilled in the art according to conventional requirements.
It should be noted that the protection scope of the present patent is not limited to the above-mentioned several embodiments, and the functional chinlon, chinlon colored yarn, etc. produced by using the master batch drying method specific to the present application should fall within the protection scope of the present patent.
Claims (9)
1. A production method of nylon fiber comprises the following steps:
s1 mixing: adding the dried slices and the master batches dried by the master batch dryer (1) into a mixing device (2) for mixing;
melting of S2: the slices mixed by the mixing device (2) and the master batches enter a screw extruder (3) together for melt extrusion to obtain a spinning melt;
s3 dynamic mixing: the spinning melt flows out of the screw extruder (3) and then enters a dynamic mixing device (4) for dynamic mixing;
s4 spinning: conveying the dynamically mixed spinning melt to a spinning box body (5), and conveying the spinning melt to each spinning component through a metering pump for spinning to generate fibers;
s5 air blowing cooling: the fibers are cooled by air blowing by a side air blowing device (6):
s6 bundling and oiling: bundling and oiling fibers;
s7 winding and forming: stretching and pre-networking the oiled tows, and finally winding and forming the tows by a winding machine (7); the method is characterized in that: the master batch drying method comprises three steps of stirring and air-drying in an air-drying hopper (104) in the first step, exhausting air and removing dust in the master batch dryer (1) at the same time, removing master batch dust generated during stirring by using an air filter (120), dropping the stirred and air-dried master batch into a heating hopper (105) to be heated and dried in the second step, and dropping the heated and dried master batch into a material storage cavity (114) to be stored in a heat preservation way and used for outputting and mixing with slices at any time in the third step;
the master batch dryer (1) comprises a cylinder body (101), wherein a feeding pipe (102) is arranged at the top of the cylinder body (101), a discharging pipe (103) is arranged at the bottom of the cylinder body (101), an air drying hopper (104) and a heating hopper (105) are arranged in the cylinder body (101), an air hole is formed in the whole body of the air drying hopper (104), a stirring paddle (106) is arranged in the air drying hopper (104), a driving shaft of the stirring paddle (106) is in transmission connection with a motor (107) positioned at the top of the cylinder body (101), an air cover (108) is arranged on the outer side of the air drying hopper (104), the inner surface of the air cover (108) is an inclined surface (109) matched with the shape of the air drying hopper (104), and air outlet grooves (110) are fully distributed on the inclined surface (109); the heating hopper (105) is positioned below the air drying hopper (104), the upper end surface of the heating hopper (105) is provided with a conical guider (112) through a rod body (111), and the lower end surface of the heating hopper (105) is provided with a heating element (113); the area between the heating hopper (105) and the bottom of the cylinder body (101) is the material storage cavity (114); the master batch dryer (1) also comprises an air inlet pipe (115) and an air outlet pipe (116), one end of the air inlet pipe (115) is connected with an air inlet machine (117), the other end of the air inlet pipe is connected with an air cover (108), and a heating jacket (119) is arranged on the air inlet pipe (115); a dust hood (127) is arranged above the air drying bucket (104), the air outlet pipe (116) is connected with the dust hood (127), and an air filter (120) and an exhaust fan (118) are arranged on the air outlet pipe (116); valves are arranged on the feeding pipe (102), the discharging pipe (103), the air inlet pipe (115), the air outlet pipe (116), the air drying hopper (104) and the outlet pipe of the heating hopper (105);
the air filter comprises a machine shell (130), a telescopic cover (131), a dust hopper (132), a dust collecting tank (133) and a lifter (134), wherein the machine shell (130) comprises a top plate (135) and an outer wall (136) and an inner wall (137) which are continuous on four sides below the top plate (135), an inner flanging (138) is arranged on the bottom surface of the outer wall (136) and connected with the bottom of the inner wall (137), a filter screen (139) is arranged in the middle of the inner wall (137), and an air suction cavity (140) is formed between the outer wall (136) and the inner wall (137); an inlet pipeline (153) of the air filter (120) is arranged on the top plate (135) and is communicated with a space surrounded by the inner wall (137), and an outlet pipeline (154) is arranged on the outer wall (136) and is communicated with the air suction cavity (140); the telescopic cover (131) is connected between the machine shell (130) and the dust collection hopper (132); the upper end face of the dust hopper (132) is connected with a sealing bottom plate (141) through a support rod (152), four edges of the sealing bottom plate (141) are provided with grooves (142), a rotating shaft (143) is arranged in each groove (142), a turning plate (144) penetrates through each rotating shaft (143), the position of each rotating shaft (143) on each turning plate (144) is closer to the inner end of each turning plate (144) and is in an eccentric shape, the outer end of each turning plate (144) is provided with a cleaning brush (145), and the top of the inner end of each turning plate (144) is provided with an L-shaped sheet (146); the side wall of the groove (142) is provided with a convex rib (147) for preventing the inner end of the turning plate (144) from excessively deflecting; the dust collecting tank (133) is connected below the dust hopper (132), and the lifter (134) drives the dust hopper (132) to lift.
2. The production method of nylon fiber according to claim 1, characterized in that: in the S2 melting step, the number of heating zones of the screw extruder is 5, wherein the temperature of the first zone is 245-.
3. The production method of nylon fiber according to claim 1, characterized in that: the temperature of the spinning beam (5) in the S4 spinning step is 263-268 ℃.
4. The production method of nylon fiber according to claim 1, characterized in that: in the S5 air-blowing cooling step, the temperature of cross air-blowing is 18-20 ℃, and the humidity is 65-68%.
5. The production method of nylon fiber according to claim 1, characterized in that: s6 bundling and oiling: the oil feeding amount is 1.0-1.2%.
6. The production method of nylon fiber according to claim 1, characterized in that: in the step of S7 winding and forming: the winding speed is 4200-4500 m/min.
7. The production method of nylon fiber according to claim 1, characterized in that: the feeding pipe (102) is arranged at the eccentric position of the top of the cylinder body (101), and a guider (128) is arranged in the cylinder body (101) to guide the master batches falling from the feeding pipe (102) into the air drying hopper (104).
8. The production method of nylon fiber according to claim 1, characterized in that: the first step of drying the master batch by the master batch dryer (1) is a step of weighing the air drying hopper (104), and feeding is stopped when the master batch in the air drying hopper (104) reaches a preset weight.
9. The production method of nylon fiber according to claim 1, characterized in that: an annular seat (124) is arranged in the cylinder body (101), a plurality of guide rods (125) are arranged on the upper end face of the annular seat (124), the air drying bucket (104) is arranged in the annular seat (124) in a penetrating mode, the outward-turned opening edge of the air drying bucket (104) is used for the guide rods (125) to penetrate through, and a weighing sensor (126) is arranged between the opening edge of the air drying bucket (104) and the annular seat (124).
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| CN202110323033.XA CN112959541B (en) | 2021-03-26 | 2021-03-26 | Production method of nylon fiber |
| CN202210161823.7A CN114986737A (en) | 2021-03-26 | 2021-03-26 | Nylon fiber, antibacterial nylon fiber and production method of flame-retardant nylon fiber |
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| CN202110323033.XA CN112959541B (en) | 2021-03-26 | 2021-03-26 | Production method of nylon fiber |
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| IT202200011555A1 (en) * | 2022-05-31 | 2023-12-01 | Piovan Spa | Apparatus and method for processing material in a hopper |
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Denomination of invention: A Production Method of Nylon Fiber Effective date of registration: 20230920 Granted publication date: 20220318 Pledgee: Zhejiang Xiaoshan Rural Commercial Bank Co.,Ltd. Guali Branch Pledgor: Zhejiang Fangxin New Material Co.,Ltd. Registration number: Y2023980057592 |
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