Oiling nozzle for chemical fiber production and method of using same

Abstract

The embodiment of the present application discloses an oiling nozzle for chemical fiber production, comprising: an oiling nozzle body, a groove for passing fiber tows is formed on the working surface of the oiling nozzle body, the groove penetrates the working surface of the oiling nozzle body along the direction of fiber tow travel, and the bottom of the groove is provided with an oil outlet hole near the entrance of the fiber tow into the groove, the opening width of the groove on the working surface of the oiling nozzle body decreases along the direction of fiber tow travel, and the bottom of the groove is shaped as a circular arc protruding towards the fiber tow along the direction of fiber tow travel throughout its length. In the production process, the installation and fixing angle of the oiling nozzle is adjusted according to the specifications of the chemical fiber, so that the opening width of the groove corresponding to the position where the fiber tow contacts the bottom of the groove and the fineness of the fiber tow are matched. The oiling nozzle of the present application is convenient to adjust, has a wide range of applicable fiber specifications, and has good uniformity of oiling.

Description

Technical Field

[0001] The embodiments of this application relate to the field of chemical fiber spinning equipment technology, and in particular to an oiling nozzle for chemical fiber production and its usage method. Background Technology

[0002] The production process of chemical fibers typically involves first preparing natural or synthetic polymers or inorganic substances into a spinning melt or solution. This melt is then filtered, metered, and extruded through a spinneret into a liquid stream, which is subsequently cooled and solidified to form fibers. These fibers, at this stage, are called nascent fibers. Their mechanical properties are very poor, requiring a series of post-processing steps to meet the requirements of textile processing and use. Post-processing mainly involves stretching and heat setting to improve the fibers' mechanical properties and dimensional stability. To improve the processing performance (such as cohesion, smoothness, antistatic properties, and openability) of nascent fibers or their finished products in post-processing and subsequent textile manufacturing, oiling agents are applied to the fibers after they are produced or during post-processing. Oiling is a crucial step in chemical fiber production. It gives the fibers a smooth and soft feel, increases the cohesion between fibers, reduces friction between fibers and between fibers and machinery, reduces or eliminates static electricity, and increases fiber toughness. Oiling is an essential process in the spinning process, and it plays an extremely important role in improving the stability of the spinning process and reducing the breakage rate.

[0003] In existing technologies, the shape of the oiling nozzle's oil groove is fixed, and the nozzle's installation angle is not adjustable. A single type of oiling nozzle is only suitable for fibers with a certain fineness specification, resulting in poor compatibility. If the oiling nozzle does not match the fineness specification of the spun fiber, problems such as filament jamming, oil leakage, or filament vibration within the oil groove may occur. This not only reduces the uniformity of oiling during spinning but also deteriorates fiber evenness, severely impacting spinning quality. Therefore, in current chemical fiber spinning production practices, factories must maintain a stock of a series of oiling nozzles of different specifications. When a change in fiber fineness requires replacing the corresponding nozzle, the original nozzle must be disassembled, a new nozzle installed, and its installation position and orientation readjusted. A break-in period is then required to achieve stable oiling results. Each nozzle replacement typically takes nearly a day to reach a stable production state, severely impacting continuous production efficiency and increasing production costs.

[0004] Due to the aforementioned problems, it is necessary to improve the existing oil nozzle structure and usage method. Summary of the Invention

[0005] The main objective of this invention is to provide an adjustable oiling nozzle that is easy to adjust, applicable to a wide range of fiber fineness specifications, and has high oiling uniformity, as well as its method of use.

[0006] To achieve the above objectives, the present invention provides an oiling nozzle with a unique structure and an adjustable installation angle, used to apply oiling agent to chemical fibers during the spinning process.

[0007] According to one aspect of the present invention, an oiling nozzle for chemical fiber production includes: an oiling nozzle body, a groove formed on the working surface of the oiling nozzle body for passing through fiber filaments, the groove extending through the working surface of the oiling nozzle body along the fiber filament travel direction, and an oil outlet hole being formed at the bottom of the groove of the oiling nozzle body near the fiber filament inlet, the opening width of the groove on the working surface of the oiling nozzle body decreasing along the fiber filament travel direction, and the bottom of the groove being formed into an arc shape protruding toward the fiber filament along its entire length along the fiber filament travel direction.

[0008] Furthermore, the central angle corresponding to the arc shape is greater than 60 degrees.

[0009] Furthermore, the ratio of the minimum to the maximum opening width of the groove on the working surface of the upper nozzle body 1 is 1:5 to 1:15.

[0010] The method of using the oiling nozzle in the production of chemical fibers is as follows: during the production process, adjust the installation and fixing angle of the oiling nozzle according to the specifications of the chemical fibers so that the opening width of the groove corresponding to the position of the bottom contact arc of the fiber filament is adapted to the fineness of the fiber filament.

[0011] Furthermore, the fiber filaments have an entry angle of 15-35 degrees when entering the groove of the upper oil nozzle, and an exit angle of 15-35 degrees when leaving the groove of the upper oil nozzle.

[0012] According to another aspect of the present invention, an oiling nozzle for chemical fiber production includes: an oiling nozzle base and an oiling core, the oiling core being rotatably embedded in the oiling nozzle base, a groove for fiber filaments to pass through is formed on the working surface of the oiling core, the groove extending through the working surface of the oiling core along the fiber filament travel direction, and an oil outlet hole is opened near the fiber filament inlet of the oiling nozzle base, the opening width of the groove on the working surface of the oiling core decreases along the fiber filament travel direction, and the bottom of the groove is formed into an arc shape protruding towards the fiber filament along its entire length along the fiber filament travel direction.

[0013] Furthermore, there are two grooves, which are symmetrically distributed on the working surface of the upper oil core component about the geometric center of the upper oil core component, and the two grooves have the same geometry and size.

[0014] Alternatively, the two grooves have the same length but different opening widths.

[0015] Furthermore, the ratio of the opening width of one groove to that of the other groove at the same position along the length of the groove is 1:2 to 1:5.

[0016] Furthermore, the central angle corresponding to the arc shape at the bottom of the groove is greater than 60 degrees.

[0017] Furthermore, the ratio of the minimum to the maximum opening width of the groove on the working surface of the upper oil core component is 1:5 to 1:15.

[0018] Furthermore, the oil core component is constructed as a cylinder.

[0019] Furthermore, the oil nozzle base and the oil nozzle core are made of different materials.

[0020] Furthermore, the base material of the oil nozzle is plastic, and the oil filling core is made of ceramic.

[0021] Furthermore, an adjusting and positioning component is provided for adjusting and fixing the installation angle of the oiling core component embedded in the oil nozzle base.

[0022] Furthermore, the adjusting positioning component includes a positioning bolt and a locking nut. The positioning bolt passes through the central through hole of the upper oil core component and cooperates with the locking nut to fix the upper oil core component to the upper oil nozzle base.

[0023] The method of using the oiling nozzle for chemical fiber production is as follows: during the spinning process, the installation angle of the oiling core in the oiling nozzle base is adjusted according to the specifications of the spun chemical fiber so that the opening width of the groove corresponding to the bottom contact arc of the fiber filament is adapted to the fineness of the fiber filament.

[0024] Furthermore, the fiber filaments have an entry angle of 15-35 degrees when entering the groove of the upper oil nozzle, and an exit angle of 15-35 degrees when leaving the groove of the upper oil nozzle.

[0025] By applying the technical solution of this invention, the oiling nozzle of this invention is applicable to a wide range of fiber fineness specifications, is easy to adjust, and has high oiling uniformity. It can meet the needs of chemical fiber production for rapid adjustment of fiber fineness specifications, significantly improve production efficiency, and reduce production costs. Attached Figure Description

[0026] Other objects and advantages of the invention will become apparent from the following description of the invention with reference to the accompanying drawings, and will help to provide a comprehensive understanding of the invention.

[0027] Figure 1 This is a front view schematic diagram of a first specific embodiment of the oil nozzle according to the present invention;

[0028] Figure 2This is a side cross-sectional structural schematic diagram of a first specific embodiment of the oil nozzle according to the present invention;

[0029] Figure 3 This is a front view schematic diagram of a second specific embodiment of the oil nozzle according to the present invention;

[0030] Figure 4 This is a side cross-sectional structural schematic diagram of a second specific embodiment of the upper oil nozzle according to the present invention;

[0031] Figure 5 This is a side view schematic diagram of the oiling core component according to the third and fourth specific embodiments of the oiling nozzle of the present invention.

[0032] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner without affecting the reader's understanding.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Oil nozzle body; 2. Thread; 3. Groove; 4. Oil outlet hole;

[0035] 5. Bottom contact arc; 6. Upper grease nipple base; 7. Upper grease core component;

[0036] 8. Positioning bolt; 9. Locking nut; α. Thread inlet angle; β. Thread outlet angle. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. Obviously, the described embodiments are one embodiment of this invention, and not all embodiments. Based on the described embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0038] It should be noted that, unless otherwise expressly specified and limited, the technical or scientific terms used in this application should have the ordinary meaning understood by a person skilled in the art to which this invention pertains. If the text uses terms such as "first" or "second," these terms are used only to distinguish similar objects and should not be construed as indicating or implying their relative importance, order, or implicitly specifying the number of technical features indicated. It should be understood that the data in the descriptions of "first" and "second" can be interchanged where appropriate. If the phrase "and / or" appears throughout the text, it means including three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. For ease of description, spatial relative terms such as "above," "below," "top," and "bottom" can be used here, only to describe the spatial positional relationship between one device or feature as shown in the figure and other devices or features. It should be understood that this also includes different orientations during use or operation besides those shown in the figure. Furthermore, the terms "installation," "connection," "linking," and "fixing" used in this application should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] The present application will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0040] Figure 1 and Figure 2 These are a front view and a side cross-sectional view of the first specific embodiment of the oiling nozzle of the present invention. As can be seen from the figures, an oiling nozzle for chemical fiber production is typically installed on a spinning machine to apply oil to fiber filaments after cooling and solidification. It includes: an oiling nozzle body 1, with the side of the oiling nozzle body 1 facing the fiber filament as a working surface. A groove 3 is formed on the working surface for the fiber filament 2 to pass through. The groove 3 extends through the working surface of the oiling nozzle body 1 along the direction of fiber filament 2 travel. An oil outlet 4 is formed at the bottom of the groove 3 of the oiling nozzle body 1 near the entrance of the fiber filament 2 into the groove 3. Oil is supplied via an oil supply pipeline, continuously flowing out from the oil outlet 4 and adhering to the bottom of the groove 3. When the high-speed fiber filament 2 passes through the groove 3, it contacts the bottom of the groove 3, thereby uniformly coating the surface of the fiber filament 2 with oil.

[0041] like Figure 1As shown, the opening width of the groove 3 on the working surface of the upper nozzle body 1 decreases along the direction of fiber filament 2. That is, the opening width of the groove 3 on the working surface of the upper nozzle body 1 is the largest at the groove inlet in the direction of fiber filament 2 and the smallest at the groove outlet in the direction of fiber filament 2.

[0042] like Figure 2 As shown, the bottom of the groove 3 is shaped into an arc protruding towards the fiber filament 2 along its entire length along the direction of travel of the fiber filament 2. In this way, the fiber filament 2 enters the groove 3 substantially along the tangential direction of the arc-shaped bottom of the groove 3 and contacts the bottom of the groove 3 to receive the oil.

[0043] The groove 3, with its arc-shaped bottom protruding towards the fiber filament 2, should have sufficient length, and the central angle corresponding to its arc-shaped bottom should be at least 60 degrees. For example, the central angle can be 90 degrees, 120 degrees, 150 degrees, or 180 degrees. Simultaneously, the ratio of the minimum opening width of the groove 3 on the working surface of the upper nozzle body 1 (i.e., the opening width of the groove 3 at the outlet of the fiber filament 2) to the maximum opening width (i.e., the opening width of the groove 3 at the inlet of the fiber filament 2) should be 1:5 to 1:15. For example, the ratio can be 1:6, 1:8, 1:10, or 1:12.

[0044] When applying oil to fiber filaments using an oiling nozzle, the matching relationship between the fiber fineness and the width of the groove opening of the oiling nozzle used to receive the fiber filaments must be considered. If the groove opening width is too small, the fiber filaments are prone to jamming and breakage, disrupting the continuity of spinning production; if the groove opening width is too large, the fiber filaments are prone to shaking in the groove, leading to uneven oiling and uneven fiber evenness, resulting in a serious deterioration in the quality of the fiber filament product.

[0045] Therefore, when applying oil to the fiber filaments using the oiling nozzle of the present invention, the installation and fixing angle of the oiling nozzle needs to be adjusted according to the specifications of the chemical fiber so that the opening width of the groove 3 corresponding to the bottom contact arc 5 of the groove 3 is compatible with the fineness of the fiber filament 2.

[0046] The adjustment of the oil nozzle mounting angle in the first specific embodiment can be accomplished using conventional techniques commonly used by those skilled in the art. For example, the mounting base of the oil nozzle can be designed with an arc-shaped elongated hole. The mounting bolt of the oil nozzle passes through the arc-shaped elongated hole, and the oil nozzle is fixed to the mounting base with the mounting nut. By changing the position of the mounting bolt in the arc-shaped elongated hole, the mounting angle of the oil nozzle can be easily adjusted, so that the fiber filament 2 can enter the groove 3 of the oil nozzle in the appropriate direction and position.

[0047] Figure 3 and Figure 4These are, respectively, a front view and a side cross-sectional view of the second specific embodiment of the oil nozzle of the present invention, which are respectively a front view schematic diagram and a side cross-sectional view structural schematic diagram. Figure 3 and Figure 4 It can be seen that, with Figure 1 and Figure 2 The difference between the oil nozzle structure in the first embodiment and the second embodiment is that the oil nozzle in the second embodiment is a split structure, which includes an oil nozzle base 6 and an oil nozzle core 7. The oil nozzle core 7 is rotatably embedded in the oil nozzle base 6, and the groove 3 for the fiber filament 2 to pass through is formed on the working surface of the oil nozzle core 7. Similar to the groove 3 in the first embodiment, the groove 3 in the second embodiment also has an opening width that decreases along the direction of fiber filament 2 travel, and an arc-shaped groove bottom that protrudes towards the fiber filament 2.

[0048] Figure 5 This is a side cross-sectional view of the oiling core 7 in the third and fourth specific embodiments of the oiling nozzle of the present invention. As can be seen from the figure, it is similar to... Figure 4 The difference between the oiling core component structure in the second embodiment and the third and fourth embodiments is that the oiling core component 7 has two grooves, namely groove 3A and groove 3B. Grooves 3A and 3B are symmetrically distributed about the geometric center of the oiling core component 7 on the working surface of the oiling core component 7.

[0049] In a third embodiment of the oiling nozzle of the present invention, the grooves 3A and 3B have the same geometry and dimensions. Thus, when one of the grooves 3A wears beyond the permissible range due to prolonged use, the oiling core embedded in the oiling nozzle base 6 can be rotated 180 degrees to apply oil to the fiber filaments using the other groove 3B, thereby doubling the service life of the oiling core.

[0050] In a fourth embodiment of the oiling nozzle of the present invention, grooves 3A and 3B have the same length, but different opening widths. For example, the ratio of the opening width of one groove 3A to that of the other groove 3B at the same position along the groove length direction is 1:2 to 1:5. This significantly expands the applicability of the oiling core to fiber filaments of different fineness specifications.

[0051] Similar to the groove 3 in the first embodiment above, the grooves 3A and 3B in the third and fourth embodiments also have an opening width that decreases along the direction of travel of the fiber filament 2, and an arc-shaped groove bottom that protrudes toward the fiber filament 2.

[0052] The oiling core 7 is configured to be rotatably fitted into the oiling nozzle base 6; for example, it can be configured as a cylinder. The oiling nozzle base 6 and the oiling core 7 can be made of the same material or different materials. For example, the oiling nozzle base 6 can be made of plastic, while the oiling core 7 can be made of ceramic.

[0053] The adjustment methods for the upper oil nozzle in the second, third, and fourth embodiments differ from those in the first embodiment. When adjustment is required, it is not necessary to change the installation angle of the upper oil nozzle base; instead, adjustment can be completed simply by rotating the upper oil core 7 to change the relative angular position between the upper oil core 7 and the upper oil nozzle base 6.

[0054] like Figure 3 As shown, for ease of adjustment, the upper nozzle of the present invention is also provided with an adjusting and positioning component for adjusting and fixing the installation angle of the upper nozzle core 7 embedded in the upper nozzle base 6. The adjusting and positioning component can be constructed to include a positioning bolt 8 and a locking nut 9. The positioning bolt 8 passes through the central through hole of the upper nozzle core 7 and cooperates with the locking nut 9 to fix the upper nozzle core 7 to the upper nozzle base 6. In this way, through the cooperation of the locking nut 9 and the positioning bolt 8, the operator can easily use conventional tools to manually adjust and fix the working angle of the upper nozzle.

[0055] When applying oil to the fiber filaments using the upper oil nozzle, the fiber filament 2 does not travel in a straight line along the tangent direction of the arc-shaped groove surface. Instead, it enters and exits the groove 3 of the upper oil nozzle at a certain angle to the tangent at the midpoint of the contact arc 5. Typically, the fiber filament 2 enters the groove 3 of the upper oil nozzle from top to bottom, with its entry direction forming an entry angle α with the vertical direction. When exiting the groove 3 of the upper oil nozzle, its exit direction forms an exit angle β with the vertical direction.

[0056] In the prior art, the entry angle and exit angle of the fiber filament 2 when entering and leaving the groove 3 of the oiling nozzle are usually set to 2-6 degrees. The problem is that the contact arc length of the fiber filament 2 on the arc surface of the groove 3 is relatively short, and the stability of the fiber filament movement and the uniformity of oiling are not satisfactory.

[0057] To solve the above-mentioned technical problems, when applying oil to fiber filaments using the oiling nozzle of the present invention, the entry angle of the fiber filament 2 when entering the groove of the oiling nozzle is set to 15-35 degrees, for example, 20 degrees, 25 degrees, or 30 degrees. Simultaneously, the exit angle of the fiber filament 2 when leaving the groove of the oiling nozzle is set to 15-35 degrees, for example, 20 degrees, 25 degrees, or 30 degrees. Compared with the prior art, the oiling nozzle of the present invention significantly improves the movement stability and oiling uniformity of the fiber filament 2 as it passes through the groove of the oiling nozzle and contacts its surface during use.

[0058] The adjustable oiling nozzle of this invention has a simple structure, is easy to adjust, has a wide range of applications, and provides high oiling uniformity. Because it employs a quick-adjustable working angle oiling nozzle structure, when it is necessary to change the fineness specification of the produced fiber, there is no need to replace it with another oiling nozzle of a different specification. Only the installation angle of the currently used oiling nozzle needs to be adjusted and re-fixed to quickly complete the oiling process adjustment. This significantly improves production efficiency and reduces production costs without affecting the spinning quality.

[0059] The oiling nozzle of this invention also has the following advantages in actual spinning: 1. It allows for fine adjustment for a single specification, thus making oiling more efficient. Traditional oiling nozzles generally have a spinning range during spinning. However, they cannot achieve the best oiling performance for every specification within that range. The oiling nozzle of this invention can achieve more thorough and precise oiling by finely adjusting the internal width and curvature of the nozzle, effectively avoiding problems of oil waste and insufficient oiling. It achieves the best performance of the oiling nozzle for every specification within a certain range.

[0060] 2. The application range is wider than traditional oil nozzles. In actual factories, spinning specifications frequently change, often using different oil nozzles for coarse, medium, and fine denier yarns. Therefore, when changing yarn types, the original oil nozzle needs to be removed and replaced with a different one. The oil nozzle of this invention can adjust the nozzle width and yarn contact angle through fine adjustments, regardless of whether the yarn is fine or coarse. This allows a single oil nozzle to be used for spinning from fine to coarse denier yarns. The width of the oiling groove is changed from a stepped, segmented adjustment to stepless, fine adjustment. This ensures the oiling groove width is at its optimal level, effectively saving factory capital costs and the labor and time costs associated with changing oil nozzles. It also significantly improves fiber quality.

[0061] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. The scope of protection of the present invention should be determined by the scope of the claims.

[0062] Regarding the embodiments of the present invention, it should also be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to obtain new embodiments.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "one example," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] The above description, in conjunction with specific embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. Those skilled in the art to which this application pertains can make several simple deductions or substitutions without departing from the concept of this application.

Claims

1. An oiling nozzle for chemical fiber production, characterized in that: Includes the upper oil nozzle base (6) and the upper oil core component (7), The upper oil core component (7) is rotatably embedded in the upper oil nozzle base (6). The working surface of the upper oil core component (7) is formed with grooves (3A, 3B) for the fiber filaments (2) to pass through. The grooves (3A, 3B) penetrate the working surface of the upper oil core component (7) along the traveling direction of the fiber filaments (2). The upper oil nozzle base (6) has an oil outlet hole (4) at the entrance of the fiber filaments (2) into the grooves (3A, 3B). The opening width of the groove (3A, 3B) on the working surface of the upper oil core (7) decreases along the direction of travel of the fiber filament (2), and the bottom of the groove (3A, 3B) is formed into an arc shape that protrudes toward the fiber filament (2) along its entire length along the direction of travel of the fiber filament (2). The number of grooves (3A, 3B) is two. The two grooves (3A, 3B) are symmetrically distributed on the working surface of the upper oil core (7) about the geometric center of the upper oil core (7). The two grooves (3A, 3B) have the same length and different opening widths. Compared to the other groove (3B), the opening width ratio of one groove (3A) at the same position along the groove length is 1:2 to 1:

5.

2. The oil nozzle according to claim 1, characterized in that: The central angle corresponding to the arc shape at the bottom of the groove (3A, 3B) is greater than 60 degrees.

3. The oil nozzle according to claim 1, characterized in that: The ratio of the minimum to the maximum opening width of the groove (3A, 3B) on the working surface of the upper oil core component (7) is 1:5 to 1:

15.

4. The oil nozzle according to any one of claims 1-3, characterized in that: The upper oil core (7) is constructed in a cylindrical shape.

5. The oil nozzle according to any one of claims 1-3, characterized in that: The upper nozzle base (6) and the upper oil core (7) are made of different materials.

6. The oil nozzle according to claim 5, characterized in that: The upper oil nozzle base (6) is made of plastic, and the upper oil core (7) is made of ceramic.

7. The oil nozzle according to any one of claims 1-3, characterized in that: It is also provided with an adjustment and positioning component for adjusting and fixing the oil core component (7) to the installation angle embedded in the oil nozzle base (6).

8. The oil nozzle according to claim 7, characterized in that: The adjusting positioning component includes a positioning bolt (8) and a locking nut (9). The positioning bolt (8) passes through the central through hole of the upper oil core component (7) and cooperates with the locking nut (9) to fix the upper oil core component (7) to the upper oil nozzle base (6).

9. A method of using an oiling nozzle for chemical fiber production, employing an oiling nozzle as described in any one of claims 1-8, characterized in that: During the spinning process, the installation angle of the oiling core (7) in the oiling nozzle base (6) is adjusted according to the specifications of the spun chemical fiber so that the opening width of the groove (3A,3B) corresponding to the bottom contact arc (5) of the fiber filament (2) is adapted to the fineness of the fiber filament (2).

10. The method of use according to claim 9, characterized in that: The fiber filament (2) has an entry angle of 15-35 degrees when it enters the groove (3A, 3B) of the upper oil nozzle, and the fiber filament (2) has an exit angle of 15-35 degrees when it leaves the groove (3A, 3B) of the upper oil nozzle.

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