Method for manufacturing optical cable filler yarn and optical cable filler yarn

Abstract

The embodiment of the application provides a kind of preparation method of optical cable filling line and optical cable filling line, belong to optical cable technical field, wherein, the preparation method of optical cable filling line includes the following steps: substrate preparation material is mixed according to first preset proportion weight;The mixed substrate preparation material is sent into extrusion equipment and is extruded granulation, and filling base material is prepared;Coating lubricating wrapping layer on the surface of the filling base material;Coating foaming agent wrapping layer outside the lubricating wrapping layer;The filling base material coated with the foaming agent wrapping layer is sent into the extrusion equipment and is extruded, and optical cable filling line is obtained.The preparation method of optical cable filling line in the embodiment of the application can improve the adhesion and stability of foaming material on the filling base material, reduce the overall density and weight of optical cable filling line through foaming process, and reduce the cost of producing optical cable filling line.

Description

TECHNICAL FIELD

[0001] The present application relates to optical cable technology, in particular to a preparation method of optical cable filler yarn and optical cable filler yarn. BACKGROUND

[0002] The filler yarn is mainly used in the field of optical cable manufacturing. When the number of optical fiber sleeves in the optical cable is insufficient to be twisted into a bundle, the number is supplemented by adding the filler yarn to complete the cable core twisting, so as to ensure the stability and roundness of the cable core.

[0003] In the related art, the optical cable filler yarn mainly uses polypropylene and calcium carbonate as the main body, supplemented with a small amount of polyethylene for toughening. As a filler material, the performance requirement of the optical cable filler yarn is not high, so a large proportion of calcium carbonate is added to reduce the cost. However, a large proportion of calcium carbonate content will cause problems such as difficulty in processing and forming, low toughness, and quality defects. SUMMARY

[0004] The present application provides a preparation method of optical cable filler yarn and optical cable filler yarn to solve the technical problem of poor forming performance of the optical cable filler yarn in the related art.

[0005] In one aspect, the present application provides a preparation method of optical cable filler yarn, comprising the following steps:

[0006] Mixing the base material preparation materials according to a first preset proportion by weight;

[0007] Sending the mixed base material preparation materials into an extrusion device for extrusion granulation to prepare a filler base material;

[0008] Coating a lubricating wrapping layer on the surface of the filler base material;

[0009] Coating a foaming agent wrapping layer outside the lubricating wrapping layer;

[0010] Sending the filler base material coated with the foaming agent wrapping layer into the extrusion device for extrusion to obtain the optical cable filler yarn.

[0011] In one possible implementation, the step of coating a lubricating wrapping layer on the surface of the filler base material comprises:

[0012] Mixing the filler base material and a lubricating material according to a second preset proportion by weight, so that the lubricating material forms the lubricating wrapping layer on the surface of the filler base material. The filler base material is a granular material or a strip-shaped material, and the lubricating material is a liquid material.

[0013] The second preset proportion by weight of the filler base material and the lubricating material is:

[0014] Filler base material 95-99 parts;

[0015] lubricating material 0.2-1 parts;

[0016] In a possible implementation, the foaming agent coating layer is coated outside the lubricating coating layer, and the foaming agent coating layer comprises:

[0017] The lubricating coating layer is mixed with the foaming material according to a third preset weight ratio, so that the foaming material forms a foaming agent coating layer on the surface of the lubricating coating layer, and the foaming material is a powdery material.

[0018] The third preset weight ratio of the lubricating material and the foaming material is:

[0019] lubricating material 0.2-1 parts;

[0020] foaming material 0.3-0.7 parts.

[0021] In a possible implementation, the base material preparation material comprises polypropylene, polyethylene, calcium carbonate and an antioxidant, and the lubricating material is an alkane material.

[0022] In a possible implementation, the base material preparation material further comprises a processing aid, and the base material preparation material is mixed according to a first preset weight ratio, and comprises:

[0023] polypropylene 45-75 parts;

[0024] polyethylene 10-25 parts;

[0025] calcium carbonate 5-25 parts;

[0026] antioxidant 0.1-0.6 parts;

[0027] processing aid 1-3 parts.

[0028] In a possible implementation, the processing aid comprises at least one of the following materials: color master batch, color powder, alkane compound, polymer wax, and stearate.

[0029] In a possible implementation, the extrusion device comprises a body part and a head part, and the head part is used for extruding the filling base material; wherein, along the conveying direction of the base material preparation material, the temperature of the body part gradually increases, and the temperature of the rear region of the head part is lower than that of the front region.

[0030] In a possible implementation, the temperature of the body part is 160-210°C, and the temperature of the head part is 165-180°C.

[0031] In a possible implementation, the foaming material comprises a foaming agent main material and a foaming aid, the foaming agent main material is azodicarbonamide, and the foaming aid comprises at least one of the following materials: a vinyl stabilizer, a stearate, an organic metal complex, and ethylene glycol.

[0032] In another aspect, the embodiment of the present application further provides a cable filler optical cable, which is prepared by the preparation method of the cable filler optical cable.

[0033] The preparation method of the cable filler optical cable provided by the embodiment of the present application can improve the uniformity of the components of the base material preparation material by mixing the base material preparation material according to the first preset proportion weight, ensure the consistency of the performance of the subsequent extrusion molding of the base material preparation material, coat the lubricating wrapping layer on the surface of the base material preparation material, use the lubricating wrapping layer to provide adhesion and foaming basis for the subsequent foaming agent wrapping layer, facilitate the uniform and comprehensive wrapping of the foaming material on the base material preparation material, in addition, the foaming process can effectively reduce the overall density and weight of the cable filler optical cable, save processing materials, and reduce the comprehensive cost of the cable filler optical cable. BRIEF DESCRIPTION OF DRAWINGS

[0034] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0035] Figure 1 The flow chart of the preparation method of the cable filler optical cable in the embodiment of the present application.

[0036] Figure 2 The flow chart of the preparation method of the cable filler optical cable in the embodiment of the present application.

[0037] The above drawings have shown the specific embodiments of the present application, which will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0038] In order to make the objects, technical solutions and advantages of the present application clearer, the following will be combined with the accompanying drawings for the preferred embodiments of the present application to make the technical solutions in the embodiments of the present application more clearly and in more detail. In the drawings, the same or similar notations represent the same or similar parts or parts having the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, rather than all the embodiments. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0039] In the description of the present application, it should be noted that unless specifically defined and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0041] The terms "first", "second", "third", "fourth" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0042] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0043] As described in the background art, the optical cable filler mainly uses polypropylene with calcium carbonate as the main body, supplemented with a small amount of polyethylene for toughening. The optical cable filler, as a filler material, has low performance requirements, and therefore a large proportion of calcium carbonate is added to reduce costs. However, a large proportion of calcium carbonate content can cause problems such as difficulty in processing and forming, low toughness, and quality defects.

[0044] Based on the above description, the present application provides an optical cable filler and a preparation method thereof. In the preparation method of the optical cable filler, the mixed base material preparation material is sent into an extrusion device for extrusion granulation to prepare a filler base material. A lubricating coating layer and a foaming coating layer are sequentially coated on the filler base material. The lubricating coating layer provides a coating basis for the foaming coating layer, ensuring that the foaming coating layer can be stably and effectively adhered to the filler base material, and ensuring uniform distribution of the foaming material on the filler base material. At the same time, the foaming process can reduce the overall density and weight of the optical cable filler, save processing materials, and reduce the overall cost.

[0045] The preparation method of the optical cable filler in the present application will be described below with reference to the accompanying drawings.

[0046] As shown in Figure 1 and Figure 2 , the preparation method of the optical cable filler provided in the present application includes the following steps:

[0047] Step 100, mixing the base material preparation material according to a first preset proportion by weight;

[0048] Step 200, sending the mixed base material preparation material into an extrusion device for extrusion granulation to prepare a filler base material;

[0049] Step 300, coating a lubricating coating layer on the surface of the filler base material;

[0050] Step 400, coating a foaming agent coating layer outside the lubricating coating layer;

[0051] Step 500, sending the filler base material coated with the foaming agent coating layer into the extrusion device for extrusion to obtain an optical cable filler.

[0052] It can be seen from the above description that the preparation method of the optical cable filling line provided in the embodiments of the present application can improve the uniformity of the components of the base material preparation material by mixing the base material preparation materials according to the first preset proportion by weight, ensure the consistency of the performance of the subsequent extrusion molding of the base material preparation material, coat the lubricating wrapping layer on the surface of the base material preparation material, use the lubricating wrapping layer to provide adhesion and foaming basis for the subsequent foaming agent wrapping layer, facilitate the uniform and comprehensive wrapping of the foaming material on the base material preparation material, and effectively reduce the overall density and weight of the optical cable filling line through the foaming process, save other processing materials, and reduce the comprehensive cost of the optical cable filling line. In addition, in the embodiments of the present application, the secondary mixing and coating process is used to eliminate the operation of the foaming agent granulation process in the related art, thereby reducing the cost.

[0053] In the above description, the optical cable filling line is generally twisted with other functional wire harnesses to form a complete optical cable wire harness. The optical cable filling line in the related art is generally a solid filling line. Through the foaming process of the embodiments of the present application, the foamed and porous optical cable filling line is obtained through extrusion molding. On the premise that the diameter and volume do not change, the overall weight and density are reduced. In addition, the foamed and porous optical cable filling line can provide additional cushioning for other functional wire harnesses, assist in absorbing external impact and vibration, and protect the optical fiber from damage. Here, the other functional wire harnesses can be set according to the wire harness types in the related art, including core optical fiber wire harnesses, signal transmission wire harnesses, etc.

[0054] In some embodiments, in step 300, the lubricating wrapping layer is coated on the surface of the filling base material, including:

[0055] The filling base material and the lubricating material are mixed according to a second preset proportion by weight, so that the lubricating material forms a lubricating wrapping layer on the surface of the filling base material. The filling base material is a granular material or a strip-shaped material, and the lubricating material is a liquid material. The second preset proportion by weight of the filling base material and the lubricating material is:

[0056] The filling base material is 95-99 parts;

[0057] The lubricating material is 0.2-1 part.

[0058] In the above embodiments, the shape of the filling base material is determined by the mold of the extrusion equipment. Generally, the filling base material of the extrusion equipment is tubular, rod-shaped or plate-shaped. The filling base material is periodically cut to form granular or strip-shaped. The mixing method of the filling base material and the lubricating material can be mixed by a low-speed mixer. After the two are fully mixed, the surface of the filling base material is uniformly and comprehensively wrapped with the lubricating material, so that the surface of the filling base material forms a lubricating wrapping layer.

[0059] Of course, the second preset proportion weight components of the filling base and the lubricating material are in the interval range, and the second preset proportion weight components of the filling base and the lubricating material can be selected flexibly in the interval range according to the actual design requirements of the optical cable filling line.

[0060] For example, the second preset proportion weight components of the filling base and the lubricating material include the following: 95 parts of the filling base and 1 part of the lubricating material; or 95 parts of the filling base and 0.2 parts of the lubricating material; or 99 parts of the filling base and 1 part of the lubricating material; or 99 parts of the filling base and 0.2 parts of the lubricating material; or 97 parts of the filling base and 0.5 parts of the lubricating material. Here, the second preset proportion weight components of the filling base and the lubricating material are only used as a proportion reference.

[0061] In some embodiments, in step 400, the foaming agent wrapping layer is coated outside the lubricating wrapping layer, including:

[0062] The lubricating wrapping layer and the foaming material are mixed according to a third preset proportion weight, so that the foaming material forms a foaming agent wrapping layer on the surface of the lubricating wrapping layer, and the foaming material is a powdery material; wherein the preset proportion weight of the lubricating material and the foaming material is:

[0063] The lubricating material is 0.2-1 parts;

[0064] The foaming material is 0.3-0.7 parts.

[0065] In the above embodiments, the mixing method of the filling base with the lubricating wrapping layer and the foaming material can be mixed by a low-speed mixer device. After the two are fully mixed, since the filling base is a granular material or a strip-shaped material, and the foaming material is a powdery material, the lubricating wrapping layer will be uniformly and comprehensively wrapped around the foaming material, so that the surface of the lubricating wrapping layer forms a foaming agent wrapping layer.

[0066] If the lubricating material and the foaming material are directly mixed into the filling base at the same time, the lubricating material and the foaming material are easy to form clumps, which seriously affects the uniformity of the filling base. Therefore, by coating the lubricating wrapping layer first and then coating the foaming agent wrapping layer, the lubricating wrapping layer can provide adhesion and wrapping basis for the foaming agent wrapping layer, and the lubricity of the filling base to each other reduces the interference friction of the granular or strip-shaped, so that the filling base is more evenly distributed and more easily flows, thereby further improving the overall uniformity and compactness of the optical cable filling line, which helps to improve the mechanical strength and durability of the cable.

[0067] In addition, the powdery foaming material can be more uniformly and comprehensively coated on the lubricating wrapping layer, thereby improving the uniformity of the distribution of the foaming material in the basic process and avoiding the problem of local over-thickness or over-thin foaming.

[0068] Of course, the third preset proportion weight component of the lubricating material and the foaming material is in the interval range, and the third preset proportion weight component of the lubricating material and the foaming material can be flexibly selected in the interval range according to the actual design requirements of the cable filling line.

[0069] For example, the third preset proportion weight component of the lubricating material and the foaming material includes the following: 0.2 parts of lubricating material and 0.3 parts of foaming material; or 1 part of lubricating material and 0.3 parts of foaming material; or 0.2 parts of lubricating material and 0.7 parts of foaming material; or 1 part of lubricating material and 0.7 parts of foaming material; or 0.5 parts of lubricating material and 0.3 parts of foaming material; or 0.5 parts of lubricating material and 0.7 parts of foaming material; or 0.5 parts of lubricating material and 0.5 parts of foaming material, under the premise that the second preset proportion weight component of the filling base and the lubricating material is unchanged. Here, the third preset proportion weight component of the lubricating material and the foaming material is only used as a proportion reference.

[0070] In some embodiments, the base material preparation material includes polypropylene, polyethylene, calcium carbonate, and an antioxidant, and the lubricating material is an alkane material.

[0071] Here, it should be noted that the polyethylene and the polypropylene are both post-consumer recycled materials (PCR), and the mechanical strength requirement of the cable filling line itself as a support of the cable structure is not high, and there is no appearance and beautification requirement. Compared with the same filling line in the related art, the regenerated polyethylene and the regenerated polypropylene of the post-consumer recycled material can effectively save materials and costs.

[0072] In addition, the lubricating material can use white oil, liquid paraffin, naphthenic oil, etc., as long as it can uniformly wrap and wet the filling base in a liquid state.

[0073] Further, the base material preparation material further includes a processing aid, and the base material preparation material is mixed according to a first preset proportion weight, including:

[0074] 45-75 parts of polypropylene;

[0075] 10-25 parts of polyethylene;

[0076] 5-25 parts of calcium carbonate;

[0077] 0.1-0.6 parts of antioxidant;

[0078] 1-3 parts of processing aid.

[0079] Exemplarily, both the polypropylene and the polypropylene are made of recycled materials. Since most of the foaming materials in the prior art are made of petrochemical new materials, the use of recycled materials to prepare the foaming filling line can effectively reduce the material cost and promote the recycling of the materials. The calcium carbonate is calcium carbonate with a mesh size of 1250 or more. Further, the activated calcium titanate with a mesh size of 2000 or more is used. The activated calcium carbonate helps to improve the dispersibility of the calcium carbonate, reduce the powder agglomeration, and improve the foaming uniformity.

[0080] In some embodiments, the calcium carbonate can be replaced by other nucleating agents, which will not be described in detail in the embodiments of the present application.

[0081] The antioxidant is antioxidant 1010, the chemical name is tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester; or antioxidant 168, the chemical name is tris(2,4-di-tert-butylphenyl) phosphite; or antioxidant DLTP, the chemical name is dilauryl thiodipropionate. Of course, a plurality of different antioxidants can be mixed or used alone.

[0082] The processing aid includes at least one of the following materials: foaming aid, stabilizer, color master batch, color powder, alkane compound, polymer wax, stearate. Here, the foaming aid and the stabilizer can refer to the materials in the related art. For example, the foaming aid is mainly one or more of vinyl stabilizer, stearate, organic metal complex, ethylene glycol.

[0083] The aforementioned base material preparation material is taken as a first preset proportion weight component in an interval range. According to the actual design requirements of the optical cable filling line, the first preset proportion weight component of the base material preparation material can be flexibly selected within the above interval range.

[0084] For example, the base material preparation material is mixed according to the first preset proportion weight, including the following: polypropylene 45 parts, polyethylene 10 parts, no calcium carbonate component, antioxidant 0.1 part, processing aid 1 part; or polypropylene 45 parts, polyethylene 10 parts, calcium carbonate 10 parts, antioxidant 0.3 parts, processing aid 2 parts; or polypropylene 75 parts, polyethylene 25 parts, calcium carbonate 25 parts, antioxidant 0.6 parts, processing aid 3 parts. Here, the component proportion of the base material preparation material is only exemplified.

[0085] It should be noted that in the embodiments of the present application, the foaming material includes a foaming agent main material and a foaming aid. The foaming agent main material is azodicarbonamide, and the foaming aid includes at least one of the following materials: vinyl stabilizer, stearate, organic metal complex, ethylene glycol.

[0086] The component proportion of the foaming agent main material and the foaming aid is:

[0087] The foaming agent main material is 0.2-0.5 parts.

[0088] foaming aid 0.1-0.2 parts.

[0089] For example, the ratio of the main foaming agent to the foaming aid includes the following: 0.2 parts of the main foaming agent and 0.1 part of the foaming aid; or 0.5 parts of the main foaming agent and 0.1 part of the foaming aid; or 0.2 parts of the main foaming agent and 0.2 part of the foaming aid; or 0.5 parts of the main foaming agent and 0.2 part of the foaming aid; or 0.3 parts of the main foaming agent and 0.1 part of the foaming aid.

[0090] As shown in Figure 1 After the foaming agent wrapping layer is coated on the filling base material, the method for preparing the optical cable filling line further includes the following steps:

[0091] Step 500, the filling base material coated with the foaming agent wrapping layer is sent into an extrusion device for extrusion to obtain the optical cable filling line.

[0092] In step 500, the extrusion device can be a single-screw extruder, and the extrusion device includes a body part and a head part, and the head part is used for extruding the filling base material; wherein the temperature of the body part gradually increases along the conveying direction of the base material preparation material, and the temperature of the rear region of the head part is lower than that of the front region.

[0093] In the production process of the optical cable filling line, the foaming degree of the filling base material or the finished product density of the optical cable filling line can be controlled by adjusting the temperature of the extrusion device.

[0094] Generally, reducing the process temperature of the extrusion device will reduce the foaming degree of the filling base material, and correspondingly, the finished product density of the optical cable filling line is improved; increasing the process temperature of the extrusion device will increase the foaming degree, and correspondingly the finished product density of the optical cable filling line is reduced. However, too high process temperature of the extrusion device will cause abnormal increase of the porosity of the filling base material, and the finished product extrusion is not formed, which cannot be normally produced.

[0095] In some embodiments, the temperature of the body part is 160-210℃, and the temperature of the head part is 165-180℃.

[0096] The temperature of the head part is lower than that of the body part, which is beneficial to cooling and extruding, and the core principle is that the temperature of the head part needs to be lower than that of the adjacent body part by 15-25℃.

[0097] Exemplary, with a single screw extruder of 45mm diameter in the related art as an example, the present application provides several different body temperature and head temperature of the control examples, the single screw extruder traction speed is 120 m / min, along the conveying direction of the single screw extruder, the single screw extruder includes body 1, body 2, body 3, body 4, head 1 and head 2.

[0098] Specifically as follows:

[0099] The actual temperature of each part of the single screw extruder in example a is set as shown in Table 1.

[0100] Table 1

[0101] Fuselage 1 175 Fuselage 2 180 Fuselage 3 195 Fuselage 4 195 Nose 1 180 Nose 2 170

[0102] Through actual detection, the actual production of the cable filling line product density is 0.75 g / cm 3， , which meets the product qualification requirements.

[0103] The actual temperature of each part of the single screw extruder in example b is set as shown in Table 2.

[0104] Table 2

[0105] Fuselage 1 160 Fuselage 2 170 Fuselage 3 185 Fuselage 4 185 Nose 1 170 Nose 2 165

[0106] Through actual detection, the actual production of the cable filling line product density is 0.85 g / cm 3 , which meets the product qualification requirements.

[0107] The actual temperature of each part of the single screw extruder in control example c is set as shown in Table 3.

[0108] Table 3

[0109] Fuselage 1 160 Fuselage 2 180 Fuselage 3 200 Fuselage 4 210 Nose 1 190 Nose 2 180

[0110] Through actual detection, the actual production of the cable filling line product density is 0.6 g / cm 3 , but the porosity of the cable filling line product is too high, the material forming is difficult, it is difficult to process, and it cannot be normally produced.

[0111] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0112] It is to be understood that the application is not limited to the precise construction herein described and as shown in the attached drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is to be indicated by the appended claims, rather than the description and examples.

Claims

1. A method of making a cable filler yarn, characterized by, The method comprises the following steps: mixing the base material preparation materials according to a first preset proportion by weight; sending the mixed base material preparation materials into an extrusion device for extrusion granulation to obtain a filling base material; coating a lubricating wrapping layer on the surface of the filling base material; coating a foaming agent wrapping layer outside the lubricating wrapping layer; sending the filling base material coated with the foaming agent wrapping layer into the extrusion device for extrusion to obtain an optical cable filling line; the step of coating a lubricating wrapping layer on the surface of the filling base material comprises: mixing the filling base material and a lubricating material according to a second preset proportion by weight, so that the lubricating material forms the lubricating wrapping layer on the surface of the filling base material, the filling base material is a granular material or a strip-shaped material, and the lubricating material is a liquid material; the step of coating a foaming agent wrapping layer outside the lubricating wrapping layer comprises: mixing the lubricating wrapping layer and a foaming material according to a third preset proportion by weight, so that the foaming material forms the foaming agent wrapping layer on the surface of the lubricating wrapping layer, and the foaming material is a powdery material.

2. The method according to claim 1, wherein the second preset proportion by weight of the filling base material and the lubricating material is: wherein filling base material 95-99 parts; lubricating material 0.2-1 part.

3. The method according to claim 2, wherein the third preset proportion by weight of the lubricating material and the foaming material is: lubricating material 0.2-1 part; wherein, foaming material 0.3-0.7 part. The base material preparation materials comprise polypropylene, polyethylene, calcium carbonate and an antioxidant, and the lubricating material is an alkane material. The method for preparing the line, wherein the base material preparation materials further comprise a processing aid, and the base material preparation materials are mixed according to a first preset proportion by weight, and the base material preparation materials comprise:

4. The method of claim 2, wherein the optical cable filler yarn is prepared by the steps of: polypropylene 45-75 parts; 5. The optical cable fill of claim 4 polyethylene 10-25 parts; calcium carbonate 5-25 parts; antioxidant 0.1-0.6 parts; processing aid 0.1-3 parts.

6. The method according to claim 5, wherein the processing aid comprises at least one of the following materials: color master batch, color powder, alkane compound, polymer wax and stearate.

7. The method according to any one of claims 1-6, wherein the extrusion device comprises a body part and a head part, the head part is used for extruding the filling base material, wherein the temperature of the body part gradually increases along the conveying direction of the base material preparation materials, and the temperature of the rear area of the head part is lower than that of the front area. The temperature of the body part is 160-210 DEG C, and the temperature of the head part is 165-180 DEG C. The foaming material comprises a foaming agent main material and a foaming aid, the foaming agent main material is azodicarbonamide, and the foaming aid comprises at least one of the following materials: vinyl stabilizer, stearate, organic metal complex and ethylene glycol. The optical cable filling line is prepared by the method according to any one of claims 1-9. ​ ​ 8. The method of making optical cable filler yarn according to claim 7, wherein, ​ 9. The method of making optical cable filler yarn according to claim 3, wherein, ​ 10. An optical cable filler yarn characterized by, ​

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