Multi-groove monofilament, production process thereof and spinneret plate

Abstract

The invention discloses a multi-groove monofilament which comprises a body, the cross section of the body comprises a long strip and n equal-diameter arc-shaped protrusions, n is larger than or equal to 2, the arc-shaped protrusions are symmetrically and evenly distributed on the long strip, and a groove is formed between every two adjacent arc-shaped protrusions. The invention further provides a production process of the multi-groove monofilament. Comprising the following steps: S1, drying high-viscosity polyester chips in a dryer for 4-6 hours; s2, feeding the dried high-viscosity polyester chips into a screw melt extruder, heating the high-viscosity polyester chips to 220-280 DEG C, feeding the high-viscosity polyester chips into a spinning machine, extruding the high-viscosity polyester chips through forming holes in a spinneret plate, and cooling and forming the extruded monofilaments in water; carrying out secondary stretching in hot air at 160-240 DEG C, and then carrying out hot air setting at 170-250 DEG C; and winding to obtain a finished product. The production process of the multi-groove monofilament is simple and controllable, the production cost is low, the fluidity, the spinnability, the pollution resistance and the use durability of the produced multi-groove monofilament are greatly improved, and the invention further provides a multi-groove monofilament spinneret plate.

Description

Technical Field

[0001] The invention belongs to the field of nylon yarns, and in particular relates to a multi-groove monofilament, a production process of the multi-groove monofilament, and a multi-groove monofilament spinneret. Background Art

[0002] In the prior art, technical research on the anti-fouling monofilaments for woven papermaking meshes has been carried out both at home and abroad. There are many types of anti-fouling monofilament products. In order to improve the anti-fouling performance, many research topics are aimed at changing the material to improve the anti-fouling ability, but the results are minimal. The large amount of research and development funds invested by papermaking mesh R&D manufacturers cannot solve the problem. Anti-fouling monofilaments are used to weave papermaking meshes. Due to the intersection of warp and weft wires, pulp fibers are easily hidden when contacting pulp, and it is not easy to remove them during cleaning. On the other hand, the fluidity, spinnability and durability of the anti-fouling monofilaments produced in the prior art are all lacking. Summary of the invention

[0003] The first problem solved by the present invention is to provide a multi-groove monofilament that is easy to clean stains, has excellent fluidity, and has better spinnability and durability; the second problem solved by the present invention is to provide a production process for producing the multi-groove monofilament; and the third problem solved is to provide a spinneret for producing the multi-groove monofilament.

[0004] To solve the first problem, the present invention provides a multi-groove monofilament, including a main body, the cross-section of the main body includes a long strip and n arc-shaped protrusions of equal diameter, n≥2, the arc-shaped protrusions are symmetrically distributed on the long strip, and grooves are formed between adjacent arc-shaped protrusions.

[0005] Beneficial effect: Since the above-mentioned technical scheme adopts the technical feature of having multiple grooves in the cross section, the multi-grooved monofilament of the technical scheme is more convenient for cleaning during use when used to weave a papermaking mesh. Because the papermaking mesh needs to be cleaned after completing a pulp forming process, the grooves on the multi-grooved monofilament are convenient for cleaning with a brush in the forward direction, or cleaning with a high-pressure water gun along the grooves on the surface, which greatly reduces the labor intensity of cleaning and shortens the cleaning time, thereby improving production efficiency; on the other hand, since the technical scheme adopts a long strip shape in the cross section, for the same bearing strength requirement, the cross-sectional thickness of the technical scheme is smaller than the diameter of the anti-fouling monofilament of the prior art, so that the multi-grooved monofilament of the technical scheme is better when used to weave a papermaking mesh, thereby increasing the service life of the papermaking mesh; in addition, compared with the monofilament of the prior art, the multi-grooved monofilament of the technical scheme has a larger contact area under the premise of the same weight, thereby saving material. Since the cross-section includes a long strip and n arc-shaped protrusions of equal diameter, the fluidity is greatly improved during production, and the multiple grooves formed in the cross-section are easy to clean, thereby improving the durability of use. Due to the requirement for the same bearing strength, the cross-sectional thickness of the present technical solution is smaller than the diameter of the anti-fouling monofilament in the prior art, so that the multi-groove monofilament of the present technical solution is better in softness when used for weaving papermaking mesh, and therefore has better spinnability.

[0006] As a specific solution of the above technical solution, n=8.

[0007] To solve the second problem, the present invention provides a production process of multi-groove monofilament, comprising the following steps:

[0008] S1. Dry the high-viscosity polyester slices in a dryer for 4-6 hours;

[0009] S2. The dried high-viscosity polyester chips are fed into a screw melt extruder, heated to 220-280°C, and then enter a spinning machine and are extruded through a forming hole in a spinneret. The cross-section of the forming hole includes a long strip and n arc-shaped protrusions of equal diameter, n≥2. The arc-shaped protrusions are symmetrically distributed on the long strip, and grooves are formed between adjacent arc-shaped protrusions. The extruded monofilaments are cooled and formed in water; stretched twice in hot air at 160-240°C, and then hot-air fixed at 170-250°C; and then wound to form a finished product.

[0010] Beneficial effects:

[0011] The production process of the multi-groove monofilament is simple, controllable and low in production cost. Due to the physical transformation, during the weaving process, the multi-groove monofilament has a large surface contact area, is easier to bend and softer than ordinary round wires, and can be woven more tightly with other monofilaments. After the papermaking net has been used for a period of time, some debris in the pulp will be hidden on the surface of any type of net. Since the surface of the present invention has multiple grooves, it can be cleaned along the grooves with a brush or a high-pressure water gun after being dirty, and the labor intensity of cleaning is reduced by 10-15%, which increases the service life of the papermaking net by 20%-30%.

[0012] As a further improvement of the above technical solution, the viscosity η of the high-viscosity polyester chips in S1 is ≥1.

[0013] As a further improvement of the above technical solution, the drying temperature of the dryer in S1 is 120-130°C.

[0014] As a further improvement of the above technical solution, in S2, the dried high-viscosity polyester chips are fed into a screw melt extruder and heated to 240-260° C. for melt extrusion.

[0015] As a further improvement of the above technical solution, in S2, the original silk extruded from the spinneret is cooled in 50-75°C water, and the formed multi-groove monofilament is first stretched in 80-98°C hot water to a length 2-5.5 times the original length.

[0016] As a further improvement of the above technical solution, when the secondary stretching is performed in S2, the secondary stretching is performed in hot air at 180-220°C to a length 1.1-3 times of the original length; and finally, the shaping is performed by hot air at 190-240°C.

[0017] As a further improvement of the above technical solution, in S2, the monofilament is oiled before being wound to obtain the finished product.

[0018] To solve the third problem, the present invention provides a multi-groove single-filament spinneret, including a spinneret, wherein there are m forming holes in the spinneret, m≥2, the forming holes are evenly distributed around the axis, the cross-section of the forming holes includes a long strip and n arc-shaped protrusions of equal diameter, n≥2, the arc-shaped protrusions are symmetrically evenly distributed on the long strip, and grooves are formed between adjacent arc-shaped protrusions.

[0019] Beneficial effects: Since the m forming holes are evenly distributed around the axis, m wires are produced at a time, which improves production efficiency. The cross-section of the forming hole includes a long strip and n arc-shaped protrusions with equal diameters, so that the produced multi-groove monofilament meets the requirements, is easy to clean stains, has excellent fluidity, and has better spinnability and durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural cross-sectional view of a multi-groove single-filament spinneret in the present invention;

[0021] Figure 2 It is a schematic front view of a multi-groove single-filament spinneret in the present invention;

[0022] Figure 3 is a cross-sectional view of a multi-groove monofilament in the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of a papermaking net woven with multi-grooved monofilaments;

[0024] Reference numerals: 1, spinneret; 2, forming hole. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] Multi-groove monofilament embodiment 1

[0027] This embodiment provides a multi-groove monofilament 100, including a body, see Figure 3 The cross section of the body includes a strip 22 and n arc-shaped protrusions 21 of equal diameter, n≥2, and in this embodiment, n=8. The arc-shaped protrusions 21 are symmetrically distributed on the strip 22, and grooves 23 are formed between adjacent arc-shaped protrusions 21.

[0028] See also Figure 4 When the multi-grooved monofilament 100 of the present embodiment is used to weave a papermaking mesh, it is woven with another monofilament 200 for warp and weft. The obtained papermaking mesh is more convenient for cleaning during use, because the papermaking mesh needs to be cleaned after completing a pulp molding. The grooves on the multi-grooved monofilament are convenient for cleaning with a brush in the forward direction, or cleaning with a high-pressure water gun along the grooves on the surface. The labor intensity of cleaning is greatly reduced, the cleaning time is shortened, and the production efficiency is improved; on the other hand, since the present technical solution adopts a long strip shape in cross section, for the same bearing strength requirement, the cross-sectional thickness of the present technical solution is smaller than the diameter of the anti-fouling monofilament of the prior art, so that the multi-grooved monofilament of the present technical solution is used for weaving a papermaking mesh. The flexibility is better, and the service life of the papermaking mesh is increased; in addition, compared with the monofilament of the prior art, the multi-grooved monofilament of the present technical solution has a larger contact area under the premise of the same weight, thereby saving materials.

[0029] Example 1 of the production process of multi-groove monofilament

[0030] A production process of a multi-groove monofilament of this embodiment includes the following steps:

[0031] S1, drying the high-viscosity polyester slices in a dryer for 4 hours;

[0032] S2. The dried high-viscosity polyester chips are fed into a screw melt extruder, enter a spinning machine and are extruded through a forming hole 2 in a spinneret 1. The cross section of the forming hole 2 includes a long strip 22 and n arc-shaped protrusions 21 of equal diameter, n≥2. The arc-shaped protrusions 21 are symmetrically distributed on the long strip 22, and grooves 23 are formed between adjacent arc-shaped protrusions 21. The chips are cooled and formed in water, stretched twice, heat-set, and then wound to form a finished product.

[0033] Among them, the viscosity η of the high-viscosity polyester chips in S1 is ≥1.

[0034] Among them, the drying temperature of the dryer in S1 is 120°C.

[0035] In S2, the dried high-viscosity polyester chips are fed into a screw melt extruder and heated to 240° C. for melt extrusion.

[0036] In S2, the original yarn extruded from the spinneret 1 is cooled in 50°C water, and the formed multi-groove monofilament is stretched for the first time in 80°C hot water to twice the original length.

[0037] Among them, when the secondary stretching is performed in S2, the secondary stretching is 1.1 times the original length in 180°C hot air; finally, it is shaped by 190°C hot air.

[0038] Among them, in S2, the monofilament is oiled before being wound to obtain the finished product.

[0039] Among them, the production process of the multi-groove monofilament is simple, controllable and low in production cost, and the multi-groove monofilament produced has greatly improved fluidity, spinnability, stain resistance and durability; due to the physical transformation, during the weaving process, the obtained multi-groove monofilament has a large surface contact area, is easier to bend and softer than ordinary round wires, and can be more closely woven together with other monofilaments. After the papermaking net has been used for a period of time, some debris in the pulp will be hidden on the surface of any type of net. Since the surface of the present invention has multiple grooves, it can be cleaned along the grooves with a brush or a high-pressure water gun after being dirty, and the labor intensity of cleaning is reduced by 10-15%, and the use time of the papermaking net is increased by 20%-30%.

[0040] Example 2 of the production process of multi-groove monofilament

[0041] The production process of a multi-groove monofilament in this embodiment is basically the same as that in embodiment 1, except that:

[0042] S1, drying the high-viscosity polyester slices in a dryer for 6 hours;

[0043] Among them, the drying temperature of the dryer in S1 is 130°C.

[0044] In S2, the dried high-viscosity polyester chips are fed into a screw melt extruder and heated to 260° C. for melt extrusion.

[0045] In S2, the original yarn extruded from the spinneret 1 is cooled in 75°C water, and the formed multi-groove monofilament is first stretched in 98°C hot water to a length 5.5 times the original length.

[0046] Among them, when the secondary stretching is performed in S2, the secondary stretching is performed in 220°C hot air to 3 times the original length; finally, the hot air is used at 240°C for shaping.

[0047] Example 3 of the production process of multi-groove monofilament

[0048] The production process of a multi-groove monofilament in this embodiment is basically the same as that in embodiment 1, except that:

[0049] S1, drying the high-viscosity polyester slices in a dryer for 5 hours;

[0050] Among them, the drying temperature of the dryer in S1 is 124°C.

[0051] In S2, the dried high-viscosity polyester chips are fed into a screw melt extruder and heated to 245° C. for melt extrusion.

[0052] In S2, the original yarn extruded from the spinneret 1 is put into 66°C water for cooling, and the formed multi-groove monofilament is first stretched into 3 times of the original length through 90°C hot water.

[0053] When the secondary stretching is performed in S2, the secondary stretching is performed in 190°C hot air to a length 1.8 times the original length; finally, the shaping is performed by 210°C hot air.

[0054] Example 4 of the production process of multi-groove monofilament

[0055] The production process of a multi-groove monofilament in this embodiment is basically the same as that in embodiment 1, except that:

[0056] S1, drying the high-viscosity polyester slices in a dryer for 6 hours;

[0057] Among them, the viscosity η of the high-viscosity polyester chips in S1 is ≥1.

[0058] The drying temperature of the dryer in S1 is 128°C.

[0059] In S2, the dried high-viscosity polyester chips are fed into a screw melt extruder and heated to 250° C. for melt extrusion.

[0060] In S2, the original yarn extruded from the spinneret 1 is put into 70° C. water for cooling, and the formed multi-groove monofilament is first stretched into 5.5 times of the original length through 90° C. hot water.

[0061] When the secondary stretching is performed in S2, the secondary stretching is performed in 183°C hot air to a length 1.1-3 times of the original length; finally, the shaping is performed by 220°C hot air.

[0062] Example 5 of the production process of multi-groove monofilament

[0063] The production process of a multi-groove monofilament in this embodiment is basically the same as that in embodiment 1, except that:

[0064] Among them, the drying temperature of the dryer in S1 is 122°C.

[0065] In S2, the dried high-viscosity polyester chips are fed into a screw melt extruder and heated to 246° C. for melt extrusion.

[0066] In S2, the original yarn extruded from the spinneret 1 is put into 58° C. water for cooling, and the formed multi-groove monofilament is first stretched into 4 times of the original length through 87° C. hot water.

[0067] When the secondary stretching is performed in S2, the secondary stretching is performed in 194°C hot air to 1.8 times the original length; finally, the shaping is performed by 205°C hot air.

[0068] In order to verify the difference between the performance of the multi-groove monofilament and the traditional monofilament, the monofilament of the control group and the monofilaments produced in Examples 1, 2, 3, 4 and 5 were selected for comparison.

[0069] 1. First, the monofilaments were observed under a microscope. The monofilaments of the control group had no grooves, while the monofilaments produced in Examples 1, 2, 3, 4, and 5 were uniformly covered with grooves.

[0070] 2. Bending tensile performance test: a tensile machine was used to test the breaking strength of a single filament. It was found that the breaking strength of the single filaments produced in Examples 1, 2, 3, 4 and 5 was 2 times higher than that of the single filaments in the control group.

[0071] 3. Fatigue fracture performance test: The fatigue degree of the monofilament was tested using a fatigue testing machine. The test found that the fatigue resistance of the monofilaments produced in Example 1, Example 2, Example 3, Example 4, and Example 5 was 1.3 times higher than that of the monofilament in the control group.

[0072] In summary, the production process of the multi-grooved monofilament is simple, controllable and low in production cost, and the multi-grooved monofilament produced has greatly improved fluidity, spinnability, stain resistance and durability; due to the physical transformation, during the weaving process, the obtained multi-grooved monofilament has a large surface contact area, is easier to bend and softer than ordinary round wires, and can therefore be more tightly woven together with other monofilaments; after the papermaking net has been used for a period of time, some debris in the pulp will be hidden on the surface of any type of net; since the surface of the present invention has multiple grooves, a brush or a high-pressure water gun can be used to clean the surface along the grooves after it is dirty, and the labor intensity of cleaning is reduced by 10-15%, thereby increasing the service life of the papermaking net by 20%-30%.

[0073] Multi-groove single-filament spinneret embodiment 1

[0074] See also Figure 1 and Figure 2 The multi-groove single-filament spinneret includes a spinneret 1, wherein the spinneret 1 has m forming holes 2, m ≥ 2, and in this embodiment, m = 19, and the forming holes 2 are evenly distributed around the axis. Figure 2 , learn from Figure 3 The cross section of the forming hole 2 includes a long strip 22 and n arc-shaped protrusions 21 of equal diameter, n≥2. In this embodiment, n=8. The arc-shaped protrusions 21 are symmetrically distributed on the long strip 22, and grooves 23 are formed between adjacent arc-shaped protrusions 21.

[0075] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-grooved monofilament, comprising a body, characterized in that: The cross section of the body comprises a long strip (22) and n arc-shaped protrusions (21) of equal diameter, where n≥2. The arc-shaped protrusions (21) are symmetrically distributed on the long strip (22), and grooves (23) are formed between adjacent arc-shaped protrusions (21).

2. The multi-groove monofilament according to claim 1, characterized in that: n＝8。 3. A production process for multi-groove monofilament, characterized in that: The following steps are involved: S1. Dry the high-viscosity polyester chips in a dryer for 4-6 hours at a drying temperature of 120-130°C; S2, feeding the dried high-viscosity polyester chips into a screw melt extruder, heating them to 220-280° C., entering a spinning machine and being extruded through a forming hole (2) in a spinneret (1), wherein the cross section of the forming hole (2) comprises a long strip (22) and n arc-shaped protrusions (21) of equal diameter, where n≥2, and the arc-shaped protrusions (21) are symmetrically and evenly distributed on the long strip (22), and grooves (23) are formed between adjacent arc-shaped protrusions (21); The extruded monofilament is cooled and formed in water; it is stretched twice in hot air at 160-240°C, and then hot air fixed at 170-250°C; and then it is wound to make a multi-groove monofilament finished product.

4. The production process of a multi-groove monofilament according to claim 3, characterized in that: The viscosity η of the high-viscosity polyester chips in S1 is ≥1.

5. The production process of a multi-groove monofilament according to claim 3, characterized in that: In S2, the dried high-viscosity polyester chips are fed into a screw melt extruder and heated to 240-260° C. for melt extrusion.

6. The production process of a multi-groove monofilament according to claim 3, characterized in that: In S2, the raw silk extruded from the spinneret (1) is cooled in water at 50-75°C, and the formed multi-groove monofilament is stretched for the first time in hot water at 80-98°C to a length 2-5.5 times the original length.

7. The production process of a multi-groove monofilament according to claim 3, characterized in that: When the secondary stretching is performed in S2, the secondary stretching is performed in hot air at 180-220°C to a length 1.1-3 times of the original length; and finally, the shaping is performed by hot air at 190-240°C.

8. The production process of a multi-groove monofilament according to claim 3, characterized in that: In the S2, the monofilament is oiled before being wound to obtain the finished product.

9. A multi-groove monofilament spinneret, comprising a spinneret (1), characterized in that: The spinneret (1) has m forming holes (2), m≥2, the forming holes (2) are evenly distributed around the axis, the cross section of the forming hole (2) comprises a long strip (22) and n arc-shaped protrusions (21) of equal diameter, n≥2, the arc-shaped protrusions (21) are symmetrically evenly distributed on the long strip (22), and grooves (23) are formed between adjacent arc-shaped protrusions (21).

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