CN110045470B - Preparation method of pressure-resistant and corrosion-resistant outdoor optical cable - Google Patents
Preparation method of pressure-resistant and corrosion-resistant outdoor optical cable Download PDFInfo
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- CN110045470B CN110045470B CN201910276166.9A CN201910276166A CN110045470B CN 110045470 B CN110045470 B CN 110045470B CN 201910276166 A CN201910276166 A CN 201910276166A CN 110045470 B CN110045470 B CN 110045470B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4482—Code or colour marking
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4483—Injection or filling devices
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4486—Protective covering
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- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a preparation method of a pressure-resistant and corrosion-resistant outdoor optical cable, belonging to the technical field of optical cables, and the preparation method comprises the following steps: s1: purchasing an optical cable: the brand, the model and the length of the optical fiber are confirmed, and the appearance is checked to ensure no error and no damage; s2: preparing ingredients: the preparation method of the pressure-resistant and corrosion-resistant outdoor optical cable comprises the steps of preparing ingredients containing anticorrosive materials before optical cable sheathing is performed, and forming the ingredients by matching with PBT materials, so that the performance of sheathing raw materials is changed, the sheathing plastic has an anticorrosive effect, the protective capacity of the optical cable is improved, internal and external sheath operation is performed after sheathing and cabling are directly performed after the sheathing plastic, a support can be formed between an inner sleeve and the sheathing plastic, the optical cable inner core is prevented from being directly affected by external force, the compression resistance can be improved, and the pressure-resistant outdoor optical cable has the advantages of strong overall performance, long service life and the like.
Description
Technical Field
The invention relates to the technical field of optical cables, in particular to a preparation method of a pressure-resistant and corrosion-resistant outdoor optical cable.
Background
Communication refers to information communication and transmission between people or between people and nature through some behaviors or media, and refers to that two or more parties needing information adopt any method and any media to accurately and safely transmit the information from one party to another party under the condition that the respective will is not violated in a broad sense.
The optical cable is one of communication fittings, the optical cable is manufactured to meet the performance specification of optics, mechanics or environment, the basic structure of the optical cable is generally composed of a cable core, a reinforced steel wire, a filler and a sheath, the optical cable is a communication cable assembly which uses one or more optical fibers as transmission media and can be used individually or in groups, the optical cable is mainly composed of optical fibers (glass filaments such as hair) and plastic protective sleeves and plastic sheaths.
The existing optical cable is developed rapidly, the total length of optical cable lines is increased every year, an effective pressure-resistant and corrosion-resistant means is absent in the use of the optical cable, so that the outdoor optical cable is used, the external surface layer is corroded to influence the internal environment of the optical cable, and the internal fiber core of the optical cable is broken after being pressed by external force, so that the service life of the optical cable is influenced, and economic waste is caused.
Disclosure of Invention
The invention aims to provide a preparation method of a pressure-resistant corrosion-resistant outdoor optical cable, which aims to solve the problems that the outer surface layer of the optical cable used outdoors is corroded to influence the internal environment of the optical cable, and the internal fiber core of the optical cable is broken after the optical cable is pressed by external force, which influences the service life of the optical cable and causes economic waste due to the lack of an effective pressure-resistant corrosion-resistant means in the use of the optical cable provided in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of a pressure-resistant corrosion-resistant outdoor optical cable comprises the following steps:
s1: purchasing an optical cable: the brand, the model and the length of the optical fiber are confirmed, and the appearance is checked to ensure no error and no damage;
s2: preparing ingredients: proportioning silicone rubber, glass fiber, phenolic daub, siliceous daub, a release agent and a thickening agent, weighing the materials in a proportion of 7: 3: 0.5: 1: 0.3: 0.2, adopting a mechanical mixing mode, wherein the rotating speed of a motor of a mixer is 2600r/min, the mixing time is 45min, and the temperature during mixing is 80-120 ℃, so that no color value difference and no caking are ensured to be generated in the ingredients;
s3: and (3) coloring the optical fiber: the bare optical fiber is inspected before coloring, and the items comprise: adjusting the pitch and the disc edge distance parameters of the flat cable under the conditions of no wire throwing, wire pressing and bead stringing, mounting a cleaned mould on a mould coating cup, observing whether a mould hole is blocked or not before mounting, using an optical fiber to pass through the mould hole for several times to ensure that no scraping phenomenon exists, placing coloring ink on a rolling shaft to be uniformly stirred, wherein the stirring time is 4-6 h, the storage temperature of the ink is 0-25 ℃, the environmental requirement temperature is 15-30 ℃, the relative humidity is not more than 75%, during coloring, using cotton dipped with alcohol to pinch the optical fiber for 5 seconds, not fading to be qualified, testing the curing degree after offline, using the cotton dipped with the alcohol to wipe back and forth for 60 times, and not fading to be qualified;
s4: material mixing and extrusion: adding PBT material into the ingredients, wherein the preheating temperature of the PBT material is 80-100 ℃, the preheating time is 2-5 h, extruding the PBT material at the temperature of 120-150 ℃ by adopting a double-screw extruder, horizontally placing and cooling the PBT material for 40min, and mechanically rolling the PBT material;
s5: secondary plastic coating: extracting ingredients, controlling the environmental temperature of a plastic sheathing process to be 15-30 ℃, controlling the humidity to be less than or equal to 75%, keeping the needle tube and the wire collecting mold clean, cleaning each optical fiber group once, cleaning the optical fiber head when switching the optical fiber group, ensuring the cleanness in the mold core opening, checking the appearance after plastic sheathing, rounding the appearance of the beam tube, uniform outer diameter and smooth surface, and continuously and uniformly filling the beam tube with the optical fiber paste without bubbles;
s6: armoring and cabling: selecting and matching the specification and size of a bundle pipe, a filling rope and a reinforcing piece, checking the sequence arrangement of pipes, filling factice into the other cable core reinforcing pieces except the optical cable with a 1+5/1.7 structure, controlling the paying-off tension of the reinforcing piece to be 80 +/-20N, and finishing armoring, wherein the cable core is orderly arranged without phenomena of disorder, line pressing, line loosening and the like;
s7: forming the inner sheath: the drying temperature of a sheathing material is controlled to be 80 +/-10 ℃, the paying-off tension of a loose fiber bundle tube is 4 +/-2N, the paying-off tension of a belt fiber bundle tube is 10 +/-5N, a mold core is checked, three holes are positioned in the horizontal position during installation, oil-removing cleaning cloth is bound at a straightener, a steel wire guide wheel is adjusted to ensure that the steel wire guide wheel is positioned in the horizontal position when entering a machine head, an extrusion molding mold adopts an extrusion type, a mold core opening is retracted into a mold sleeve by 15mm, the distance between a forming mold and an overlap mold is controlled to be 10-25 mm, the positions of a steel wire and a perforation are;
s8: outer sheath forming: the drying temperature of the sheathing material is controlled to be 80 +/-10 ℃, an extrusion pipe type sheathing material extrusion molding die is adopted, a die core opening and a die sleeve are leveled or retracted by 0.5mm, the distance between a forming die and an overlapping die is 10-25 mm, the distance between an airplane die and an inlet of a sizing die is 7-10 mm, a metal belt penetrates into the die to test drawing, and the outer sheath is required to be longitudinally wrapped and rounded and has no lotus leaf edge;
s9: packaging and warehousing: carry out surface inspection to outdoor optical cable to after the cooperation rolling shaping, carry out external packaging, and carry out the surface sign, inspection surface sign: factory name, overprint content, model, specification, year, cable number and rice standard; the printed characters are clear and firm, and have no wrong printing or missing printing, any unqualified item detected in the steps is recycled to a unqualified product recycling department for manual treatment.
Compared with the prior art, the invention has the beneficial effects that: according to the preparation method of the pressure-resistant and corrosion-resistant outdoor optical cable, the ingredients containing the anticorrosive material are prepared before the optical cable is sheathed and molded, and the PBT material is matched for molding, so that the performance of the sheathed and molded raw material is changed, the sheathed and molded material has the anticorrosive effect, the protection capability of the optical cable is improved, the inner sheath and the outer sheath are operated after the sheathed and molded material is directly armored into the cable, the support can be formed between the inner sheath and the sheathed and molded material, the external force is prevented from directly influencing the inner core of the optical cable, the compression resistance can be improved, and the preparation method has the advantages of strong overall performance, long service life and the.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: a preparation method of a pressure-resistant corrosion-resistant outdoor optical cable comprises the following specific operation steps;
s1: purchasing an optical cable: the brand, the model and the length of the optical fiber are confirmed, and the appearance is checked to ensure no error and no damage;
s2: preparing ingredients: proportioning silicone rubber, glass fiber, phenolic daub, siliceous daub, a release agent and a thickening agent, weighing the materials in a proportion of 7: 3: 0.5: 1: 0.3: 0.2, adopting a mechanical mixing mode, wherein the rotating speed of a motor of a mixer is 2600r/min, the mixing time is 45min, and the temperature during mixing is 80-120 ℃, so that no color value difference and no caking are ensured to be generated in the ingredients;
s3: and (3) coloring the optical fiber: the bare optical fiber is inspected before coloring, and the items comprise: adjusting the pitch and the disc edge distance parameters of the flat cable under the conditions of no wire throwing, wire pressing and bead stringing, mounting a cleaned mould on a mould coating cup, observing whether a mould hole is blocked or not before mounting, using an optical fiber to pass through the mould hole for several times to ensure that no scraping phenomenon exists, placing coloring ink on a rolling shaft to be uniformly stirred, wherein the stirring time is 4-6 h, the storage temperature of the ink is 0-25 ℃, the environmental requirement temperature is 15-30 ℃, the relative humidity is not more than 75%, during coloring, using cotton dipped with alcohol to pinch the optical fiber for 5 seconds, not fading to be qualified, testing the curing degree after offline, using the cotton dipped with the alcohol to wipe back and forth for 60 times, and not fading to be qualified;
s4: material mixing and extrusion: adding PBT material into the ingredients, wherein the preheating temperature of the PBT material is 80-100 ℃, the preheating time is 2-5 h, extruding the PBT material at the temperature of 120-150 ℃ by adopting a double-screw extruder, horizontally placing and cooling the PBT material for 40min, and mechanically rolling the PBT material;
s5: secondary plastic coating: extracting ingredients, controlling the environmental temperature of a plastic sheathing process to be 15-30 ℃, controlling the humidity to be less than or equal to 75%, keeping the needle tube and the wire collecting mold clean, cleaning each optical fiber group once, cleaning the optical fiber head when switching the optical fiber group, ensuring the cleanness in the mold core opening, checking the appearance after plastic sheathing, rounding the appearance of the beam tube, uniform outer diameter and smooth surface, and continuously and uniformly filling the beam tube with the optical fiber paste without bubbles;
s6: armoring and cabling: selecting and matching the specification and size of a bundle pipe, a filling rope and a reinforcing piece, checking the sequence arrangement of pipes, filling factice into the other cable core reinforcing pieces except the optical cable with a 1+5/1.7 structure, controlling the paying-off tension of the reinforcing piece to be 80 +/-20N, and finishing armoring, wherein the cable core is orderly arranged without phenomena of disorder, line pressing, line loosening and the like;
s7: forming the inner sheath: the drying temperature of a sheathing material is controlled to be 80 +/-10 ℃, the paying-off tension of a loose fiber bundle tube is 4 +/-2N, the paying-off tension of a belt fiber bundle tube is 10 +/-5N, a mold core is checked, three holes are positioned in the horizontal position during installation, oil-removing cleaning cloth is bound at a straightener, a steel wire guide wheel is adjusted to ensure that the steel wire guide wheel is positioned in the horizontal position when entering a machine head, an extrusion molding mold adopts an extrusion type, a mold core opening is retracted into a mold sleeve by 15mm, the distance between a forming mold and an overlap mold is controlled to be 10-25 mm, the positions of a steel wire and a perforation are;
s8: outer sheath forming: the drying temperature of the sheathing material is controlled to be 80 +/-10 ℃, an extrusion pipe type sheathing material extrusion molding die is adopted, a die core opening and a die sleeve are leveled or retracted by 0.5mm, the distance between a forming die and an overlapping die is 10-25 mm, the distance between an airplane die and an inlet of a sizing die is 7-10 mm, a metal belt penetrates into the die to test drawing, and the outer sheath is required to be longitudinally wrapped and rounded and has no lotus leaf edge;
s9: packaging and warehousing: carry out surface inspection to outdoor optical cable to after the cooperation rolling shaping, carry out external packaging, and carry out the surface sign, inspection surface sign: factory name, overprint content, model, specification, year, cable number and rice standard; the printed characters are clear and firm, and have no wrong printing or missing printing, any unqualified item detected in the steps is recycled to a unqualified product recycling department for manual treatment.
Examples
The method comprises the following steps: purchasing an optical cable: the brand, the model and the length of the optical fiber are confirmed, and the appearance is checked to ensure no error and no damage;
step two: preparing ingredients: proportioning silicone rubber, glass fiber, phenolic daub, siliceous daub, a release agent and a thickening agent, weighing the materials in a proportion of 7: 3: 0.5: 1: 0.3: 0.2, respectively adding the raw materials with low specific gravity, then adding the raw materials with high specific gravity, adding the release agent finally, and adopting a mechanical mixing mode, wherein the rotating speed of a motor of a mixer is 2600r/min, the mixing time is 45min, and the mixing temperature is 100 ℃;
step three: and (3) coloring the optical fiber: placing coloring ink on a rolling shaft, uniformly stirring for 5h, wherein the storage temperature of the ink is 12 ℃, the environmental requirement temperature is 25 ℃, and the relative humidity is 60%, when coloring, pinching the optical fiber for 5 seconds by cotton dipped with alcohol, wherein the color does not fade to be qualified, testing the curing degree after off-line, and wiping the optical fiber for 60 times back and forth by the cotton dipped with alcohol, wherein the color does not fade to be qualified;
step four: material mixing and extrusion: adding PBT material into the ingredients, wherein the preheating temperature of the PBT material is 90 ℃, the preheating time is 3.5h, extruding the PBT material at the temperature of 130 ℃ by adopting a double-screw extruder, horizontally placing and cooling the PBT material for 40min, and then mechanically rolling the PBT material;
step five: secondary plastic coating: extracting ingredients, controlling the environmental temperature of a plastic sheathing process to be 25 ℃ and the humidity to be 83%, keeping the needle tube and the line collecting die clean, cleaning each group of optical fibers once, cleaning a head when switching the optical fiber groups, ensuring the cleanness in the die core opening, checking the appearance after plastic sheathing, rounding the appearance of a beam tube, uniform outer diameter, smooth surface, continuous and uniform filling of beam tube fiber paste and no air bubbles;
step six: armoring and cabling: selecting and matching the specification and size of a bundle pipe, a filling rope and a reinforcing piece, checking the pipe sequence arrangement, filling ointment into the other cable core reinforcing pieces except the optical cable with a 1+5/1.7 structure, controlling the paying-off tension of the reinforcing piece to be 85N, and controlling the cable core arranging line to be orderly without phenomena of disorder line, line pressing, line loosening and the like after the armoring is finished;
step seven: forming the inner sheath: the drying temperature of the sheath material is controlled at 95 ℃, the paying-off tension of a loose fiber bundle tube is 5N, the paying-off tension of a belt fiber bundle tube is 12N, a mold core is checked, three holes are positioned at the horizontal position during installation, oil cleaning cloth is bound at a straightener, a steel wire guide wheel is adjusted to ensure that the fiber cleaning cloth is positioned at the horizontal position during feeding into a machine head, an extrusion molding mold adopts an extrusion type, a mold core opening is retracted into a mold sleeve by 15mm, the distance between a forming mold and a lapping mold is controlled at 18mm, the positions of a steel wire and a perforation are checked, the;
step eight: outer sheath forming: the drying temperature of the sheathing material is controlled at 86 ℃, the extrusion molding die of the sheathing material adopts an extrusion tube type, the die core opening and the die sleeve are leveled or retracted by 0.5mm, the distance between the forming die and the lapping die is 19mm, the distance between the airplane die and the inlet of the sizing die is 8mm, a metal strip is penetrated into the die for trial drawing, and the sheathing is required to be longitudinally wrapped and rounded and has no lotus leaf edge;
step nine: packaging and warehousing: carry out surface inspection to outdoor optical cable to after the cooperation rolling shaping, carry out external packaging, and carry out the surface sign, inspection surface sign: factory name, overprint content, model, specification, year, cable number and rice standard; the printed characters are clear and firm, and have no wrong printing or missing printing, any unqualified item detected in the steps is recycled to a unqualified product recycling department for manual treatment.
The preparation method of the pressure-resistant and corrosion-resistant outdoor optical cable manufactured by the invention is compared with a common outdoor optical cable in a certain market in a test, and the test process is as follows;
1. the examples were crushed in conjunction with a breaking device such as a striker.
2. The upper end and the lower end of the embodiment are simultaneously and forcefully extruded to the member by matching with a modulus of rupture device such as a modulus of rupture tester, and the MPA which can be born can be obtained by testing the MPA which can be broken under high pressure intensity.
3. After the embodiment is placed at the natural temperature, the embodiment is placed in an acid-base fusion liquid according to a calculated soaking plan, and is taken out after being soaked for 180min, and the acid-base resistance is judged by testing the stripping force.
The test data are as follows:
| breaking Strength/N | Modulus of rupture/MPA | Corrosion resistance/% | |
| Examples | 950 | 67 | 48.6 |
| Reinspection | 580 | 23 | 17.5 |
| Comparative example | 570 | 22 | 18.7 |
Through experimental comparison, the pressure-resistant and corrosion-resistant outdoor optical cable prepared by the invention has excellent corrosion-resistant and pressure-resistant capabilities, high safety, wide application range, excellent overall performance and convenience in popularization and production.
In summary, the preparation method of the pressure-resistant and corrosion-resistant outdoor optical cable has the advantages that the ingredients containing the anticorrosive materials are prepared before the optical cable is sheathed and molded, the PBT material is matched for molding, the performance of the sheathed and molded raw materials is changed, the sheathed and molded material has the anticorrosive effect, the protective capacity of the optical cable is improved, the inner sheath and the outer sheath are operated after the sheathed and molded material is directly armored into the cable, the support can be formed between the inner sheath and the sheathed and molded material, the optical cable inner core is prevented from being directly influenced by external force, the pressure-resistant capacity can be improved, and the pressure-resistant outdoor optical cable has the advantages of strong overall performance, long service life.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. A preparation method of a pressure-resistant corrosion-resistant outdoor optical cable is characterized by comprising the following steps: the preparation method comprises the following steps:
s1: purchasing an optical cable: the brand, the model and the length of the optical fiber are confirmed, and the appearance is checked to ensure no error and no damage;
s2: preparing ingredients: proportioning silicone rubber, glass fiber, phenolic daub, siliceous daub, a release agent and a thickening agent, weighing the materials in a proportion of 7: 3: 0.5: 1: 0.3: 0.2, adopting a mechanical mixing mode, wherein the rotating speed of a motor of a mixer is 2600r/min, the mixing time is 45min, and the temperature during mixing is 80-120 ℃, so that no color value difference and no caking are ensured to be generated in the ingredients;
s3: and (3) coloring the optical fiber: the bare optical fiber is inspected before coloring, and the items comprise: adjusting the pitch and the disc edge distance parameters of the flat cable under the conditions of no wire throwing, wire pressing and bead stringing, mounting a cleaned mould on a mould coating cup, observing whether a mould hole is blocked or not before mounting, using an optical fiber to pass through the mould hole for several times to ensure that no scraping phenomenon exists, placing coloring ink on a rolling shaft to be uniformly stirred, wherein the stirring time is 4-6 h, the storage temperature of the ink is 0-25 ℃, the environmental requirement temperature is 15-30 ℃, the relative humidity is not more than 75%, during coloring, using cotton dipped with alcohol to pinch the optical fiber for 5 seconds, not fading to be qualified, testing the curing degree after offline, using the cotton dipped with the alcohol to wipe back and forth for 60 times, and not fading to be qualified;
s4: material mixing and extrusion: adding PBT material into the ingredients, wherein the preheating temperature of the PBT material is 80-100 ℃, the preheating time is 2-5 h, extruding the PBT material at the temperature of 120-150 ℃ by adopting a double-screw extruder, horizontally placing and cooling the PBT material for 40min, and mechanically rolling the PBT material;
s5: secondary plastic coating: extracting ingredients, controlling the environmental temperature of a plastic sheathing process to be 15-30 ℃, controlling the humidity to be less than or equal to 75%, keeping the needle tube and the wire collecting mold clean, cleaning each optical fiber group once, cleaning the optical fiber head when switching the optical fiber group, ensuring the cleanness in the mold core opening, checking the appearance after plastic sheathing, rounding the appearance of the beam tube, uniform outer diameter and smooth surface, and continuously and uniformly filling the beam tube with the optical fiber paste without bubbles;
s6: armoring and cabling: selecting and matching the specification and size of a bundle pipe, a filling rope and a reinforcing piece, checking the sequence arrangement of pipes, filling factice into the other cable core reinforcing pieces except the optical cable with a 1+5/1.7 structure, controlling the paying-off tension of the reinforcing piece to be 80 +/-20N, and finishing armoring, wherein the cable core is orderly arranged without phenomena of disorder, line pressing, line loosening and the like;
s7: forming the inner sheath: the drying temperature of a sheathing material is controlled to be 80 +/-10 ℃, the paying-off tension of a loose fiber bundle tube is 4 +/-2N, the paying-off tension of a belt fiber bundle tube is 10 +/-5N, a mold core is checked, three holes are positioned in the horizontal position during installation, oil-removing cleaning cloth is bound at a straightener, a steel wire guide wheel is adjusted to ensure that the steel wire guide wheel is positioned in the horizontal position when entering a machine head, an extrusion molding mold adopts an extrusion type, a mold core opening is retracted into a mold sleeve by 15mm, the distance between a forming mold and an overlap mold is controlled to be 10-25 mm, the positions of a steel wire and a perforation are;
s8: outer sheath forming: the drying temperature of the sheathing material is controlled to be 80 +/-10 ℃, an extrusion pipe type sheathing material extrusion molding die is adopted, a die core opening and a die sleeve are leveled or retracted by 0.5mm, the distance between a forming die and an overlapping die is 10-25 mm, the distance between an airplane die and an inlet of a sizing die is 7-10 mm, a metal belt penetrates into the die to test drawing, and the outer sheath is required to be longitudinally wrapped and rounded and has no lotus leaf edge;
s9: packaging and warehousing: carry out surface inspection to outdoor optical cable to after the cooperation rolling shaping, carry out external packaging, and carry out the surface sign, inspection surface sign: factory name, overprint content, model, specification, year, cable number and rice standard; the printed characters are clear and firm, and have no wrong printing or missing printing, any unqualified item detected in the steps is recycled to a unqualified product recycling department for manual treatment.
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