CN113737290A - Screw extruder and fiber spinning drafting and winding combination machine for polylactic acid industry - Google Patents
Screw extruder and fiber spinning drafting and winding combination machine for polylactic acid industry Download PDFInfo
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- CN113737290A CN113737290A CN202111163903.8A CN202111163903A CN113737290A CN 113737290 A CN113737290 A CN 113737290A CN 202111163903 A CN202111163903 A CN 202111163903A CN 113737290 A CN113737290 A CN 113737290A
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- 238000009987 spinning Methods 0.000 title claims abstract description 29
- 229920000747 poly(lactic acid) Polymers 0.000 title claims abstract description 17
- 239000004626 polylactic acid Substances 0.000 title claims abstract description 17
- 239000000835 fiber Substances 0.000 title claims description 10
- 238000004804 winding Methods 0.000 title claims description 10
- 230000006835 compression Effects 0.000 claims abstract description 66
- 238000007906 compression Methods 0.000 claims abstract description 66
- 239000000155 melt Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 12
- 230000002829 reductive effect Effects 0.000 claims description 9
- 239000010432 diamond Substances 0.000 claims description 8
- 229910003460 diamond Inorganic materials 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 6
- 238000012856 packing Methods 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims 2
- 239000002994 raw material Substances 0.000 abstract description 12
- 230000007062 hydrolysis Effects 0.000 abstract description 11
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 11
- 230000002411 adverse Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 description 8
- 238000010008 shearing Methods 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 239000007791 liquid phase Substances 0.000 description 3
- 239000007790 solid phase Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
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- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- 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
- D01D1/00—Treatment of filament-forming or like material
- D01D1/04—Melting filament-forming substances
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
本发明公开一种螺杆挤压机，涉及纺丝生产技术领域，解决了相关技术中生物基聚乳酸原料不稳定而水解对后续纺丝造成严重影响的技术问题。包括螺套和穿设于螺套的螺杆，螺杆包括依次设置的进料段、压缩段和计量段，螺套包括气体收集室和排气孔，气体收集室于压缩段与计量段的交界处的内壁上，排气孔与气体收集室连通，其中，螺套安装有以启闭排气孔的开闭阀。通过位于压缩段末端处的气体收集室对气体进行收集，经开闭阀控制，以将水解产生的气体从排气孔集中排出，在熔体进入计量段时及时除去了气体，从而克服了水解气体对纺丝的严重不利影响，改善了断头不利情形，保障了后续纺丝质量和纺丝效率。
The invention discloses a screw extruder, relates to the technical field of spinning production, and solves the technical problem in the related art that the raw material of bio-based polylactic acid is unstable and hydrolysis has a serious impact on subsequent spinning. It includes a screw sleeve and a screw through the screw sleeve. The screw includes a feeding section, a compression section and a metering section arranged in sequence. The screw sleeve includes a gas collection chamber and an exhaust hole. The gas collection chamber is located at the junction of the compression section and the metering section. On the inner wall of the air outlet, the exhaust hole communicates with the gas collection chamber, and the screw sleeve is installed with an opening and closing valve to open and close the exhaust hole. The gas is collected through the gas collection chamber located at the end of the compression section, and controlled by the on-off valve to discharge the gas generated by hydrolysis from the exhaust hole in a centralized manner, and the gas is removed in time when the melt enters the metering section, thereby overcoming the hydrolysis The serious adverse effect of gas on spinning improves the unfavorable situation of end breakage and ensures subsequent spinning quality and spinning efficiency.
Description
Technical Field
The invention relates to the technical field of spinning production, in particular to a screw extruder and a fiber spinning drafting and winding combination machine for polylactic acid industry.
Background
The existing fiber filament spinning drafting winding equipment for polylactic acid industry is mostly formed by modifying other types of equipment, and the biggest defect is that the product quality and the performance are unstable. Due to the instability of the bio-based polylactic acid raw material, the chips are hydrolyzed during the melting process to generate gas and weak acid corrosive substances, especially, the generation of the gas has serious influence on the subsequent spinning, most obviously causes a great deal of breakdowns, and needs to be improved.
Disclosure of Invention
The application provides a screw extruder and fiber spinning drafting and winding combination machine for polylactic acid industry, which solves the technical problem that hydrolysis causes serious influence on subsequent spinning due to instability of bio-based polylactic acid raw materials in the related technology.
The application provides a screw extruder, including the swivel nut and wear to locate the screw rod of swivel nut, the screw rod is including the feeding section, compression section and the measurement section that set gradually, and the swivel nut includes gas collection room and exhaust hole, and gas collection room is on the inner wall of the juncture of compression section and measurement section, and exhaust hole and gas collection room intercommunication, and wherein, the on-off valve in order to open and close the exhaust hole is installed to the swivel nut.
Optionally, the threaded sleeve comprises a first threaded sleeve and a second threaded sleeve which are in butt joint, the screw rod penetrates through the first threaded sleeve and the second threaded sleeve, the first threaded sleeve is provided with an exhaust hole and an opening and closing valve, the inner wall of one end, close to the second threaded sleeve, of the first threaded sleeve is arranged in a concave mode, a sealing gasket is arranged between the first threaded sleeve and the second threaded sleeve, and/or the inner wall of one end, close to the first threaded sleeve, of the second threaded sleeve is arranged in a concave mode, and the first threaded sleeve, the sealing gasket, the second threaded sleeve and the screw rod are enclosed together to form a gas collecting chamber.
Optionally, the feed section is a single-thread screw arrangement and the compression section is a double-thread screw arrangement.
Optionally, the compression section comprises a first compression section and a second compression section, the first compression section and the second compression section are arranged in a double-thread screw, and the screw comprises a feeding section, a first compression section, a second compression section and a metering section which are sequentially arranged;
along the material conveying direction in the screw extruder, the groove depths of the first compression section and the second compression section are gradually reduced, and the groove depth change degree of the second compression section is smaller than that of the first compression section.
Optionally, the threaded sleeve comprises an electro-contact pressure gauge, and a measuring end of the electro-contact pressure gauge is communicated with the gas collection chamber.
Optionally, the threaded sleeve comprises a base arranged on the outer edge, the exhaust hole is arranged in the base in an L shape, two ends of the exhaust hole are respectively communicated with the gas collecting chamber and the external atmosphere, and the opening and closing valve is arranged on the base;
the opening and closing valve includes:
the valve body is arranged in the base;
the valve rod is movably arranged in the valve body in a penetrating mode, and the end portion of the valve rod is arranged in an arc surface mode so as to seal or conduct the L-shaped bent portion of the exhaust hole;
the packing seal is arranged in the base and is arranged between the base and the valve rod;
the bush, the exhaust hole L shape department of buckling of base is located to the bush, and the bush is disposed and the tip cambered surface butt of valve rod.
Alternatively, the opening and closing valve includes a manual setting or an automatic setting;
one end of the exhaust hole is directly communicated with the outside atmosphere or communicated with the outside atmosphere through a vacuum pump.
Optionally, the metering section sequentially comprises a first double-thread structure, a diamond-shaped separation structure and a second double-thread structure along the material conveying direction in the screw extruder, and the diamond-shaped separation structure is in an integrated milling type diamond shape or diamond-shaped pin processing arrangement.
Optionally, along the material conveying direction in the screw extruder, the diameter of the rhombic separation type structure is gradually reduced, and the arrangement density of the rhombuses is gradually reduced;
a plurality of V-shaped grooves with grooves are distributed and paved on the screw rod of the first double-thread structure part along a spiral ring shape.
A fiber spinning, drafting and winding combination machine for polylactic acid industry comprises the screw extruder, wherein an extrusion head arranged at the head of the screw extruder is provided with a melt pressure sensor.
The beneficial effect of this application is as follows: the utility model provides a screw extruder, including the thread insert and wear to locate the screw rod of thread insert, the thread insert disposes external heater in order to provide heat outward, the screw rod includes the feed zone that sets gradually, compression section and measurement section, the polylactic acid raw materials is progressively by solid along with the one-step rising of temperature when entering the feed zone, become the melt-state fuse-element under the shearing heat effect between the raw materials simultaneously, make solid material fully melt to the liquid phase by the compression shearing in the compression section, can produce the hydrolysis in the melting process, the gas that produces causes serious influence to follow-up spinning, collect gas through the gas collection room that is located compression section tip, through switching valve control, in order to concentrate the gas that produces from the hydrolysis from the exhaust hole and discharge, gas has in time been got rid of when the melt gets into the measurement section, thereby overcome the serious adverse effect of gas to the spinning of hydrolysising, the broken head unfavorable condition has been improved, the subsequent spinning quality and the spinning efficiency are guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention.
FIG. 1 is a schematic view of the overall structure of a screw extruder provided in the present application;
FIG. 2 is a schematic view of a portion of the structure at A in FIG. 1;
FIG. 3 is a schematic cross-sectional comparison of G1-G1, G2-G2, G3-G3 in FIG. 2;
FIG. 4 is an enlarged view of a portion of FIG. 1 at B;
FIG. 5 is a schematic view of another alternative embodiment of FIG. 4;
FIG. 6 is a schematic view of another alternative embodiment of FIG. 4;
FIG. 7 is an enlarged view of a portion of FIG. 1 at C;
FIG. 8 is an enlarged view of a portion of FIG. 1 at D;
fig. 9 is a partial enlarged view at E-E in fig. 1.
The attached drawings are marked as follows: 1-a-screw sleeve, 1-b-screw rod, 1-c-base, 1-1-first screw sleeve, 1-2-electric contact pressure gauge, 1-3-opening and closing valve, 1-3 a-valve rod, 1-3 b-valve body, 1-3 c-packing seal, 1-3 d-exhaust hole, 1-3 e-bushing, 1-3 f-sealing gasket, 1-3 g-gas collecting chamber, 1-3 h-electric vacuum pump, 1-3 i-manual needle valve, 1-3 j-electric needle valve, 1-4-second screw sleeve, 1-5 a-metering section, 1-5a 1-second double-thread structure, 1-5a 2-diamond-shaped separation structure, 1-5a 3-a first double-thread structure, 1-5a 3-1-4-grooved V-shaped grooves, 1-5 b-a second compression section, 1-5 c-a first compression section and 1-5 d-a feeding section.
Detailed Description
The embodiment of the application provides a screw extruder and a fiber spinning drafting and winding combination machine for polylactic acid industry, and solves the technical problem that hydrolysis causes serious influence on subsequent spinning due to instability of bio-based polylactic acid raw materials in the related technology.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
the utility model provides a screw extruder, includes the swivel nut and wears to locate the screw rod of swivel nut, and the screw rod is including the feeding section, compression section and the measurement section that set gradually, and the swivel nut includes gas collection room and exhaust hole, and gas collection room is on the inner wall of the juncture of compression section and measurement section, and the exhaust hole communicates with gas collection room, and wherein, the on-off valve in order to open and close the exhaust hole is installed to the swivel nut.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Referring to fig. 1 and 4, the present embodiment discloses a screw extruder, which includes a screw sleeve 1-a and a screw 1-b inserted into the screw sleeve 1-a, wherein the screw 1-b includes a feeding section 1-5d, a compression section (as shown in fig. 1, the compression section is represented by a first compression section 1-5c and a second compression section 1-5b, or may be in other forms), and a metering section 1-5a, the screw sleeve 1-a includes a gas collection chamber 1-3g and an exhaust hole 1-3d, the gas collection chamber 1-3g is disposed on an inner wall of a junction of the compression section and the metering section 1-5a, the exhaust hole 1-3d is communicated with the gas collection chamber 1-3g, wherein, the screw sleeve 1-a is provided with an opening and closing valve 1-3 for opening and closing the exhaust hole 1-3 d.
The screw sleeve 1-a is externally provided with an external heater to provide heat, the screw rod 1-b comprises a feeding section 1-5d, a compression section and a metering section 1-5a which are sequentially arranged, when the polylactic acid raw material enters the feeding section 1-5d, the temperature of the solid gradually rises one step by one step, the polylactic acid raw material is changed into a molten melt under the action of shearing heat among the raw materials, and the solid material is compressed, sheared and fully melted to a liquid phase in the compression section. When the bio-based polylactic acid raw material is heated, a small part of the raw material is unstable in structure and is subjected to chemical change, hydrolysis phenomenon occurs, the generated gas seriously affects subsequent spinning, the gas is collected through a gas collecting chamber 1-3g positioned at the tail end of a compression section and is controlled by an opening and closing valve 1-3, so that the gas generated by hydrolysis is intensively discharged from exhaust holes 1-3d, and the gas is removed in time when a melt enters a metering section 1-5a, so that the serious adverse effect of the hydrolyzed gas on spinning is overcome, the adverse situation of broken ends is improved, and the quality and the spinning efficiency of the subsequent spinning are ensured.
Optionally, as shown in fig. 1 and 4, the thread insert 1-a includes a first thread insert 1-1 and a second thread insert 1-4 which are butted with each other, the screw rod 1-b is inserted into the first thread insert 1-1 and the second thread insert 1-4, the first thread insert 1-1 is provided with an exhaust hole 1-3d and is provided with an open/close valve 1-3, an inner wall of one end of the first thread insert 1-1 close to the second thread insert 1-4 is recessed, a sealing gasket 1-3f is arranged between the first thread insert 1-1 and the second thread insert 1-4, and/or the inner wall of one end of the second threaded sleeve 1-4 close to the first threaded sleeve 1-1 is concavely arranged, and the first threaded sleeve 1-1, the sealing gasket 1-3f, the second threaded sleeve 1-4 and the screw rod 1-b jointly enclose to form a gas collecting chamber 1-3 g.
The gas collection chamber 1-3g is formed by arranging the insert 1-a in the form of a combination of the first insert 1-1 and the second insert 1-4 so as to be assembled. The sealing gasket 1-3f is arranged between the first threaded sleeve 1-1 and the second threaded sleeve 1-4, namely the sealing gasket 1-3f is arranged at the butt joint face of the first threaded sleeve 1-1 and the second threaded sleeve 1-4, the first threaded sleeve 1-1 and the second threaded sleeve 1-4 can be connected through bolts, and the sealing performance of the gas collecting chamber 1-3g is ensured through the sealing gasket 1-3 f.
Wherein, the inner wall of one end of the second screw sleeve 1-4 close to the first screw sleeve 1-1 is concavely arranged, which means that on the basis that the inner wall of one end of the first screw sleeve 1-1 close to the second screw sleeve 1-4 is concavely arranged, the inner wall of one end of the second screw sleeve 1-4 close to the first screw sleeve 1-1 can be concavely arranged to form a part of a gas collecting chamber 1-3g in a matching way; the inner wall of the end of the first screw sleeve 1-1 close to the second screw sleeve 1-4 can be separately recessed, or the inner wall of the end of the second screw sleeve 1-4 close to the first screw sleeve 1-1 can be separately recessed in other possible embodiments.
Optionally, the feeding sections 1-5d are arranged in single-thread screws 1-b to complete the feeding; the compression section is arranged in a double-thread screw 1-b mode to reduce the shearing heat of the compression section and further reduce the over-temperature phenomenon of the compression section.
Optionally, referring to fig. 1, 7 and 8, the compression section includes a first compression section 1-5c and a second compression section 1-5b, the first compression section 1-5c and the second compression section 1-5b are arranged as a double-thread screw 1-b, and the screw 1-b includes a feeding section 1-5d, a first compression section 1-5c, a second compression section 1-5b and a metering section 1-5a which are arranged in sequence; along the material conveying direction in the screw extruder, the groove depths of the first compression section 1-5c and the second compression section 1-5b are gradually reduced, and the groove depth change degree of the second compression section 1-5b is smaller than that of the first compression section 1-5 c.
The groove depths of the first compression sections 1-5c are gradually reduced, and the groove depths have larger change degrees, so that solid-phase materials are fully fused to liquid phases by compression and shearing; and then the solid-phase material passes through the second compression section 1-5b, the groove depth of the second compression section 1-5b is gradually reduced, and the change degree of the groove depth is small, so that the solid-phase material is further fully melted into liquid, and gas generated after hydrolysis is stored in a relative space.
Wherein, the groove depth variation degree refers to the groove depth variation amount corresponding to the unit length of the material conveying direction in the screw extruder. The greater and lesser degree of variation in groove depth means that the two are relative.
Optionally, as shown in FIG. 1, the threaded sleeve 1-a comprises an electro-contact pressure gauge 1-2, and the measuring end of the electro-contact pressure gauge 1-2 is communicated with the gas collecting chamber 1-3 g. The gas collecting chamber 1-3g is used for collecting gas generated by hydrolysis of the materials, the gas pressure generated when the gas reaches a certain volume is reacted in an electric contact pressure gauge 1-2, and the action of opening and closing the valve 1-3 is assisted by the electric contact pressure gauge 1-2.
Alternatively, as shown in fig. 1 and 4, the screw sleeve 1-a comprises a base 1-c arranged at the outer edge, an exhaust hole 1-3d is arranged in the base 1-c in an L shape, two ends of the exhaust hole 1-3d are respectively communicated with the gas collecting chamber 1-3g and the external atmosphere, and the opening and closing valve 1-3 is arranged on the base 1-c. The opening and closing valve 1-3 comprises a valve body 1-3b, a packing seal 1-3c, a valve rod 1-3a and a bushing 1-3e, wherein the valve body 1-3b is partially arranged in the base 1-c, and the other part of the valve body protrudes out of the base 1-c (as shown in fig. 4, the valve body 1-3b is partially arranged in the base 1-c, and the other part of the valve body is exposed out of the base 1-c), the valve rod 1-3a is movably arranged in the valve body 1-3b, and the valve body 1-3b is partially arranged in the base 1-c, so that the valve rod 1-3a is also movably arranged in the base 1-c. The packing seal 1-3c is arranged in the base 1-c and between the base 1-c and the valve rod 1-3a to seal the clearance area between the base 1-c and the valve rod 1-3a, so that the gas is exhausted from the exhaust hole 1-3 d. The end part of the valve rod 1-3a is arranged in a cambered surface to seal or conduct the L-shaped bent part of the exhaust hole 1-3 d. The bush 1-3e is arranged at the bent part of the exhaust hole 1-3dL of the base 1-c, and the bush 1-3e is configured to be abutted against the end part arc surface of the valve rod 1-3a so as to ensure good sealing property when the valve rod 1-3a closes the exhaust hole 1-3 d.
The exhaust holes 1-3d are plugged or communicated by operating the positions of the valve rods 1-3 a. Further, the gas in the gas collection chamber 1-3g is discharged by opening the vent hole 1-3d under the indication of the electric contact pressure gauge 1-2.
In an alternative embodiment, as shown in FIG. 5, the opening and closing valves 1 to 3 may be provided by using manual needle type valves 1 to 3 i.
In an alternative embodiment, as shown in FIG. 6, the opening/closing valve 1-3 may be provided by an electric needle valve 1-3j, and the electric needle valve 1-3j may be controlled to be opened at a constant value in conjunction with the electro-contact pressure gauge 1-2.
In one embodiment, as shown in FIG. 4, one end of the exhaust holes 1-3d is directly connected to the outside atmosphere.
In one possible embodiment, as shown in fig. 5 and 6, an electric vacuum pump 1-3h may be added to the end of the exhaust hole 1-3d to rapidly exhaust the gas by pumping. The electric vacuum pump 1-3h can also be combined with an electric contact pressure gauge 1-2 to control the electric vacuum pump 1-3h to automatically start and exhaust under the preset gas pressure.
Alternatively, as shown in fig. 2 and 3, the metering section 1-5a sequentially comprises a first double-thread structure 1-5a3, a diamond-shaped separation structure 1-5a2 and a second double-thread structure 1-5a1 along the material conveying direction in the screw extruder, and the diamond-shaped separation structure 1-5a2 is in an integrated milling diamond or diamond-shaped pin machining arrangement. Wherein the upper row of the graph in fig. 3 shows the structure of an integrally milled diamond and the lower row of the graph in fig. 3 shows the structure of a diamond-shaped split 1-5a2 machined from diamond-shaped pins. The mixing and homogenization of the melt is further facilitated by the diamond split configuration 1-5a2 arrangement.
Optionally, as shown in fig. 9, a plurality of grooved V-shaped grooves 1-5a 3-1-4 are distributed and paved on the screw rods 1-b of the first double-thread structure 1-5a3 part along a spiral ring shape, and the groove length is set to the whole first double-thread structure 1-5a3, so as to achieve the beneficial effect of reducing the unevenness of the temperature and the intrinsic viscosity of the melt.
Alternatively, as shown in FIGS. 2 and 3, the diamond-shaped separation structures 1-5a2 have a gradually decreasing diameter and a gradually decreasing density of diamond-shaped arrangements in the material conveying direction in the screw extruder. Wherein the diameter of the diamond-shaped separation structure 1-5a2 is gradually reduced through a horizontal dotted line in fig. 3, so as to ensure that the material does not flow back and the shearing heat is gradually reduced; comparing the number of diamonds in a circle in sequence through the screenshots G3-G3, G2-G2, and G1-G1 in FIG. 3 shows that the density of the diamond arrangement gradually decreases, the initial greater density facilitates stirring, and the subsequent decrease in density facilitates the reduction of shear heat. Through the design, no circulation dead angle exists, no raw material is retained, the phenomenon of material carbonization is avoided, and the continuous operation of the spinning process is facilitated.
In one embodiment, the length of the feed section 1-5D of the single flight is set to 9D to 11D, the length of the compression section of the double flight is controlled to 10D to 11D, and the length of the metering section 1-5a is set to 9D to 15D.
In one possible embodiment, the first double thread structure 1-5a3 is provided in a length range of 4D to 10D, the diamond split structure 1-5a2 is provided in a length of 3D, and the second double thread structure 1-5a1 is provided in a length of 2D.
In one possible embodiment, the length to diameter ratio of screw 1-b is controlled to (28-34): 1.
In one possible embodiment, the temperature of the screw extruder is zoned at 160 ℃ to 240 ℃ and the pressure of the screw extruder after filtration is controlled at 80-120kg/cm 2.
In one possible embodiment, the screw edges of the feeding section 1-5d are in the same diameter and single screw pitch, the screw edges of the second double-thread structure 1-5a1 are in the same distance and the same height, and are fully melted to enable the output melt to be uniform, stabilize the pressure of the melt extrusion outlet, and facilitate the subsequent spinning to realize quantitative, constant-pressure and constant-temperature extrusion from a machine head in the mixing extrusion section.
The embodiment also discloses a fiber spinning drafting and winding combination machine for polylactic acid industry, which comprises the screw extruder, wherein an extrusion head arranged on the head of the screw extruder is provided with a melt pressure sensor, so that the melt pressure value can be detected, and the pressure of the head of the extruder is ensured to be constant.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The utility model provides a screw extruder, its characterized in that, screw extruder includes the swivel nut and wears to locate the screw rod of swivel nut, the screw rod is including the feeding section, the compression section and the measurement section that set gradually, the swivel nut includes:
the gas collecting chamber is arranged on the inner wall of the junction of the compression section and the metering section; and
a vent in communication with the gas collection chamber;
wherein the threaded sleeve is provided with an opening and closing valve for opening and closing the exhaust hole.
2. The screw extruder of claim 1, wherein the screw sleeve comprises a first screw sleeve and a second screw sleeve which are butted with each other, the screw rod is arranged in the first screw sleeve and the second screw sleeve in a penetrating manner, the first screw sleeve is provided with the exhaust hole and is provided with the opening and closing valve, the inner wall of one end, close to the second screw sleeve, of the first screw sleeve is recessed, a sealing gasket is arranged between the first screw sleeve and the second screw sleeve, and/or the inner wall of one end, close to the first screw sleeve, of the second screw sleeve is recessed, and the first screw sleeve, the sealing gasket, the second screw sleeve and the screw rod are jointly enclosed to form the gas collecting chamber.
3. The screw extruder of claim 1, wherein said feed section is a single flighted screw arrangement and said compression section is a double flighted screw arrangement.
4. The screw extruder of claim 3, wherein said compression section comprises a first compression section and a second compression section, said first compression section and said second compression section being in a double flighted screw arrangement, said screws comprising said feed section, said first compression section, said second compression section, and said metering section in sequence;
along the material conveying direction in the screw extruder, the groove depths of the first compression section and the second compression section are gradually reduced, and the groove depth change degree of the second compression section is smaller than that of the first compression section.
5. The screw extruder of claim 1, wherein the barrel includes an electro-contact pressure gauge, a measuring end of the electro-contact pressure gauge being in communication with the gas collection chamber.
6. The screw extruder according to any one of claims 1 to 5, wherein the screw sleeve comprises a base provided on an outer periphery thereof, the exhaust hole is provided in the base in an L-shape, both ends of the exhaust hole are respectively communicated with the gas collecting chamber and the outside atmosphere, and the on-off valve is mounted on the base;
the opening and closing valve includes:
the valve body is arranged in the base;
the valve rod is movably arranged in the valve body in a penetrating mode, and the end portion of the valve rod is arranged in an arc surface mode so as to seal or conduct the L-shaped bent portion of the exhaust hole;
the packing seal is arranged in the base and is arranged between the base and the valve rod;
the bush is arranged at the L-shaped bent part of the exhaust hole of the base, and the bush is configured to be abutted against the end part arc surface of the valve rod.
7. Screw extruder according to claim 6, wherein the opening and closing valve comprises a manual setting or an automatic setting;
one end of the exhaust hole is directly communicated with the external atmosphere or communicated with the external atmosphere through a vacuum pump.
8. The screw extruder of claim 1, wherein the metering section comprises, in order along the direction of material transport within the screw extruder, a first double flight configuration, a diamond-shaped split configuration, a second double flight configuration, the diamond-shaped split configuration being an integrally milled diamond or diamond-shaped pin tooling configuration.
9. The screw extruder of claim 8, wherein said rhombus-shaped segmented structures have progressively decreasing diameters and progressively decreasing density of rhombus-shaped arrangements in the direction of material transport within said screw extruder;
and a plurality of V-shaped grooves with grooves are distributed and paved on the screw rod of the first double-thread structure part along a spiral ring shape.
10. A fiber spinning, drafting and winding combination machine for polylactic acid industry, which is characterized in that the fiber spinning, drafting and winding combination machine comprises a screw extruder as claimed in any one of claims 1 to 9, and an extrusion head arranged at the head of the screw extruder is provided with a melt pressure sensor.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111163903.8A CN113737290B (en) | 2021-09-30 | 2021-09-30 | A screw extruder and a fiber spinning, drawing and winding combined machine for polylactic acid industry |
| EP22875101.2A EP4411033A1 (en) | 2021-09-30 | 2022-09-29 | Screw extruder, and fiber spinning, drafting and winding combined machine for polylactic acid industry |
| PCT/CN2022/122718 WO2023051720A1 (en) | 2021-09-30 | 2022-09-29 | Screw extruder, and fiber spinning, drafting and winding combined machine for polylactic acid industry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111163903.8A CN113737290B (en) | 2021-09-30 | 2021-09-30 | A screw extruder and a fiber spinning, drawing and winding combined machine for polylactic acid industry |
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| Publication Number | Publication Date |
|---|---|
| CN113737290A true CN113737290A (en) | 2021-12-03 |
| CN113737290B CN113737290B (en) | 2025-04-01 |
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| CN202111163903.8A Active CN113737290B (en) | 2021-09-30 | 2021-09-30 | A screw extruder and a fiber spinning, drawing and winding combined machine for polylactic acid industry |
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| WO2023051720A1 (en) * | 2021-09-30 | 2023-04-06 | 北京中丽制机工程技术有限公司 | Screw extruder, and fiber spinning, drafting and winding combined machine for polylactic acid industry |
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|---|---|
| CN113737290B (en) | 2025-04-01 |
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