阅读说明：本技术 一种隐形蝶形光缆的制造方法 (Manufacturing method of invisible butterfly-shaped optical cable ) 是由 须雁 邹文华 王晓艳 于 2019-11-30 设计创作，主要内容包括：本发明属于线缆领域,尤其是涉及—种隐形蝶形光缆的制造方法,其特征在于它包含以下步骤：形成紧套层：将光纤经过恒定张力的放线架放出,通过挤塑机,挤塑机上设有与紧套相适应的紧套模具,模具中同时挤入紧套层材料,通过三级水槽冷却后完成,第二步,形成护套层：将上述步骤后形成的紧套光纤和两根加强件经过恒定张力的放线架放出,两根加强件位于紧套光纤两侧,通过挤塑机,挤塑机上设有与护套相适应的护套模具,模具中同时挤入护套层材料,通过二级水槽冷却后完成；本发明具有便于制造、易成型、紧套层硬度高、拉伸性能好、生产线缆时速度快、等有益效果。(The invention belongs to the field of cables, and particularly relates to a manufacturing method of an invisible butterfly-shaped optical cable, which is characterized by comprising the following steps: forming a tight sleeve layer: emit optic fibre through constant tension's pay off rack, through the extruding machine, be equipped with on the extruding machine with tight cover mould that tight cover suited, crowded tight cover layer material of going into simultaneously in the mould, accomplish through tertiary basin cooling back, the second step, form the restrictive coating: discharging the tightly sleeved optical fiber and the two reinforcing pieces formed in the above steps through a pay-off rack with constant tension, wherein the two reinforcing pieces are positioned at two sides of the tightly sleeved optical fiber, a sheath mold matched with the sheath is arranged on the plastic extruding machine through the plastic extruding machine, a sheath layer material is simultaneously extruded into the mold, and the process is finished after the two reinforcing pieces are cooled through a secondary water tank; the invention has the advantages of convenient manufacture, easy molding, high hardness of the tight sleeve layer, good tensile property, high cable production speed and the like.)

1. A manufacturing method of the invisible butterfly-shaped optical cable is characterized by comprising the following steps:

step one, forming a tight sleeve layer: the optical fiber is discharged through a pay-off rack with constant tension, passes through a plastic extruding machine, a tight sleeve mold matched with the tight sleeve is arranged on the plastic extruding machine, the tight sleeve material is extruded into the mold at the same time, and the step is completed after the tight sleeve material is cooled through a three-stage water tank; the optical fiber paying-off tension is 1.2-1.3N, and the take-up tension is 6-8N; the extrusion temperature is 210 +/-3 ℃ in the 1 region, 230 +/-3 ℃ in the 2 region, 250 +/-3 ℃ in the 3 region, 250 +/-3 ℃ in the 4 region, 260 +/-3 ℃ in the 5 region, 260 +/-3 ℃ in the head, 260 +/-3 ℃ in the die orifice, the water tank adopts a sectional water tank, the temperature of the first section of water tank is 65 +/-3 ℃, the temperature of the second section of water tank is 40 +/-3 ℃, and the temperature of the third section of water tank is 21 +/-3 ℃; the extrusion molding speed is 20m/min-40m/min, and the vacuum degree is adjusted to ensure that the stripping force of the coating layer is 5-8N;

step two, forming a sheath layer: discharging the tightly sleeved optical fiber and the two reinforcing pieces formed in the step through a pay-off rack with constant tension, wherein the two reinforcing pieces are positioned at two sides of the tightly sleeved optical fiber, a sheath mold matched with the sheath is arranged on the plastic extruding machine through the plastic extruding machine, a sheath layer material is extruded into the mold at the same time, and the step is completed after the two reinforcing pieces are cooled through a secondary water tank; the paying-off tension of the tight-buffered optical fiber is 1.5-1.6N, so that the paying-off of the optical fiber is kept stable in high-speed and low-speed states, the paying-off tension of the steel wire is 6-7N, and the take-up tension is 60 +/-0.3N; the water tank adopts a sectional water tank, the temperature of the first section of water tank is 60 +/-3 ℃, and the temperature of the second section of water tank is 21 +/-3 ℃; the extrusion speed is 20m/min-30m/min, and the degree of vacuum is adjusted to make the stripping force of the coating layer 3.5-8.5N.

2. The method of claim 1, wherein the grip layer comprises the following materials by weight: 100 parts of polyamide, 15 parts of aluminum hydroxide, 13 parts of magnesium hydroxide, 14 parts of maleic anhydride grafted ethylene vinyl acetate, 24 parts of zinc borate, 3 parts of antioxidant, 32 parts of modifier, 26 parts of lubricant, 4 parts of zinc stearate, 12 parts of di (2-ethylhexyl) phthalate, 45 parts of ethylene bis-12-hydroxystearamide, 3 parts of magnesium stearate, 7 parts of aluminum tripolyphosphate, 16 parts of diisooctyl azelate, 2 parts of cancrinite, 30 parts of ethylene-chlorotrifluoroethylene copolymer and 5 parts of zinc aluminate.

3. The method for manufacturing the invisible butterfly-shaped optical cable according to claim 1, wherein the sheath layer material comprises, by weight, 100 parts of a base resin, 80 parts of a flame retardant, 3 parts of a silane coupling agent, 13 parts of polymethylsiloxane and polyethylene wax, 10 parts of carbon black, 8 parts of iron oxide, 3 parts of zinc oxide, 9 parts of a vulcanizing agent, 43 parts of silicone rubber, 6 parts of magnesium oxide, 1 part of clay, 5 parts of calcium metasilicate, 20 parts of a polyolefin elastomer, 3 parts of paraffin oil, 12 parts of dicumyl peroxide, 3 parts of antimony trioxide, 14 parts of vinyltris (β -methoxyethoxy) silane, and 4 parts of montmorillonite.

4. The method of claim 3, wherein the temperature of the tight sheath material is controlled to be 140 ± 3 ℃ in zone 1, 145 ± 3 ℃ in zone 2, 150 ± 3 ℃ in zone 3, 160 ± 3 ℃ in zone 4, 165 ± 3 ℃ in zone 5, 165 ± 3 ℃ in head 165 ± 3 ℃ in zone 4, and 170 ± 3 ℃ in die orifice.

5. The method of claim 1, wherein the sheath material is polyvinyl chloride, and the extrusion temperature is controlled to be 120 ± 3 ℃ in zone 1, 120 ± 3 ℃ in zone 2, 135 ± 3 ℃ in zone 3, 14 ± 3 ℃ in zone 4, 145 ± 3 ℃ in zone 5, 145 ± 3 ℃ in head 145 ± 3 ℃ and 150 ± 3 ℃ in die orifice.

6. The method of claim 1, wherein the tight-buffered mold comprises a tight-buffered mold core and a tight-buffered mold cover, the tight-buffered mold core has an optical fiber cable hole, and the outer diameter of the optical fiber cable hole is 0.27 ± 0.02 mm; the outer diameter of the tight sleeve die sleeve is 0.9 +/-0.05 mm.

7. The method of claim 1, wherein the sheath mold comprises a sheath core and a sheath mold, the sheath core has a tight-buffered optical fiber hole and strength member holes at both sides of the tight-buffered optical fiber hole, the tight-buffered optical fiber hole has an outer diameter of 1.0 ± 0.03mm, and the strength member holes have an outer diameter of 0.48 ± 0.03 mm; the outer diameter of the sheath die sleeve is (2 multiplied by 3) +/-0.1 mm.

Technical Field

The invention belongs to the field of cables, and particularly relates to a manufacturing method of an invisible butterfly-shaped optical cable.

Background

The optical cable has been developed for 40 years domestically, the requirements of people on the optical cable are not only limited in the use aspect, and in the home-entry stage of the optical fiber to the home, because the indoor wall of a user is generally white, the ground is peculiar color, and the color of the sheath of the butterfly-shaped optical cable to the home is generally black or white, when the butterfly-shaped optical cable is wired indoors, the color of the sheath is inevitably inconsistent with the color of the indoor wall or the ground, so that the decoration appearance is influenced, the satisfaction degree of the user is influenced, and people need the butterfly-shaped optical cable which can be normally used and does not influence the appearance.

Disclosure of Invention

In order to solve the problems, the invention aims to disclose a manufacturing method of an invisible butterfly-shaped optical cable, which is realized by adopting the following technical scheme.

The invisible butterfly-shaped optical cable comprises optical fibers, a tight sleeve layer extruded outside the optical fibers, reinforcing parts positioned on two sides of the tight sleeve layer, and an outer protective layer extruded outside the reinforcing parts and the tight sleeve layer, wherein the tight sleeve layer is transparent in color; the manufacturing method comprises the following steps:

step one, forming a tight sleeve layer: the optical fiber is discharged through a pay-off rack with constant tension, passes through a plastic extruding machine, a tight sleeve mold matched with the tight sleeve is arranged on the plastic extruding machine, the tight sleeve material is extruded into the mold at the same time, and the step is completed after the tight sleeve material is cooled through a three-stage water tank; the optical fiber paying-off tension is 1.2-1.3N, so that the paying-off of the optical fiber is kept stable in high-speed and low-speed states, and the take-up tension is 6-8N, so that the problem of unstable take-up during the conversion between the high-speed state and the low-speed state is solved; the extrusion temperature is 210 +/-3 ℃ in the 1 region, 230 +/-3 ℃ in the 2 region, 250 +/-3 ℃ in the 3 region, 250 +/-3 ℃ in the 4 region, 260 +/-3 ℃ in the 5 region, 260 +/-3 ℃ in the head, 260 +/-3 ℃ in the die orifice, the water tank adopts a segmented water tank, the temperature of the first section of water tank is 65 +/-3 ℃, the temperature of the second section of water tank is 40 +/-3 ℃ and the temperature of the third section of water tank is 21 +/-3 ℃, the segmented cooling effect is achieved, the stress in the material of the tight sleeve layer is eliminated, and the stress on the optical fiber is ensured to be within; the extrusion speed is 20m/min-40m/min, and the degree of vacuum is adjusted to make the stripping force of the coating layer 5-8N.

Step two, forming a sheath layer: discharging the tightly sleeved optical fiber and the two reinforcing pieces formed in the step through a pay-off rack with constant tension, wherein the two reinforcing pieces are positioned at two sides of the tightly sleeved optical fiber, a sheath mold matched with the sheath is arranged on the plastic extruding machine through the plastic extruding machine, a sheath layer material is extruded into the mold at the same time, and the step is completed after the two reinforcing pieces are cooled through a secondary water tank; the paying-off tension of the tight-buffered optical fiber is 1.5-1.6N, so that the paying-off of the optical fiber is kept stable in high-speed and low-speed states, the paying-off tension of the steel wire is 6-7N, and the take-up tension is 60 +/-0.3N, and the problem of unstable take-up during the conversion between the high-speed state and the low-speed state is avoided; the extrusion molding temperature is controlled to be 140 +/-3 ℃ in the region 1, 145 +/-3 ℃ in the region 2, 150 +/-3 ℃ in the region 3, 160 +/-3 ℃ in the region 4, 165 +/-3 ℃ in the region 5, 165 +/-3 ℃ in the head, 170 +/-3 ℃ in the die orifice, the water tank adopts a segmented water tank, the temperature of the water tank in the first segment is 60 +/-3 ℃, the temperature of the water tank in the second segment is 21 +/-3 ℃, the segmented cooling effect is achieved, the stress in the material of the tight-buffered material is eliminated, and the stress on the optical fiber is ensured to be within; the extrusion speed is 20m/min-30m/min, and the degree of vacuum is adjusted so that the peeling force of the coating layer is 2.5-10N.

The manufacturing method of the invisible butterfly-shaped optical cable is characterized in that the tight sleeve mold consists of a tight sleeve mold core and a tight sleeve mold sleeve, the tight sleeve mold core is provided with an optical fiber wire passing hole, and the outer diameter of the optical fiber wire passing hole is 0.27 +/-0.02 mm; the outer diameter of the tight sleeve die sleeve is 0.9 +/-0.05 mm.

The manufacturing method of the invisible butterfly optical cable is characterized in that the sheath mold consists of a sheath mold core and a sheath mold sleeve, the sheath mold core is provided with a tight-sleeved optical fiber threading hole and reinforcement threading holes at two sides of the tight-sleeved optical fiber threading hole, the outer diameter of the tight-sleeved optical fiber threading hole is 1.0 +/-0.03 mm, and the reinforcement threading hole is 0.48 +/-0.03 mm; the outer diameter of the sheath die sleeve is (2 multiplied by 3) +/-0.1 mm.

Through repeated tests of the applicant, the tight sleeve layer material is found to have excellent performance by adopting the following material formula by weight: 100 parts of polyamide, 15 parts of aluminum hydroxide, 13 parts of magnesium hydroxide, 14 parts of maleic anhydride grafted ethylene vinyl acetate, 24 parts of zinc borate, 3 parts of antioxidant, 32 parts of modifier, 26 parts of lubricant, 4 parts of zinc stearate, 12 parts of di (2-ethylhexyl) phthalate, 45 parts of ethylene bis-12-hydroxystearamide, 3 parts of magnesium stearate, 7 parts of aluminum tripolyphosphate, 16 parts of diisooctyl azelate, 2 parts of cancrinite, 30 parts of ethylene-chlorotrifluoroethylene copolymer and 5 parts of zinc aluminate.

The tight sleeve material obtained by adopting the formula has Shore hardness of 83, and the first part of the characteristic of the ant-proof sheath material for the YD/T1020-2004 cable and optical cable is as follows: the Shore hardness standard specified by the polyamide is more than or equal to 67, and exceeds the minimum requirement of YD/T1020-2004 by 23.88 percent compared with the common nylon material; the tensile strength is 52Mpa, the tensile strength standard specified by the YD/T1020-2004 standard is more than or equal to 40Mpa and exceeds the minimum requirement of the YD/T1020-2004 standard by 30 percent, so that the tight sleeve layer has better compression resistance and tensile property.

Through repeated tests of an applicant, the outer protective layer material is found to have excellent formula performance by adopting the following materials, by weight, 100 parts of matrix resin, 80 parts of flame retardant, 3 parts of silane coupling agent, 13 parts of polymethylsiloxane and polyethylene wax, 10 parts of carbon black, 8 parts of ferric oxide, 3 parts of zinc oxide, 9 parts of vulcanizing agent, 43 parts of silicone rubber, 6 parts of magnesium oxide, 1 part of clay, 5 parts of calcium metasilicate, 20 parts of polyolefin elastomer, 3 parts of paraffin oil, 12 parts of dicumyl peroxide, 3 parts of antimonous oxide, 14 parts of vinyl tri (β -methoxy ethoxy) silane and 4 parts of montmorillonite.

Adopting the tight sleeve material obtained by the formula; the tensile strength is 12.4Mpa, the tensile strength standard of the halogen-free low-smoke flame-retardant material for the YD/T1113-2015 communication cable is more than or equal to 10Mpa and exceeds the minimum requirement of the YD/T1113-2015 standard by 24 percent, so that the optical cable has better tensile property.

The invisible butterfly-shaped optical cable comprises optical fibers, a tight sleeve layer extruded outside the optical fibers, reinforcing parts positioned on two sides of the tight sleeve layer, and an outer protective layer extruded outside the reinforcing parts and the tight sleeve layer, wherein the tight sleeve layer is transparent in color; the manufacturing method comprises the following steps:

step one, forming a tight sleeve layer: the optical fiber is discharged through a pay-off rack with constant tension, passes through a plastic extruding machine, a tight sleeve mold matched with the tight sleeve is arranged on the plastic extruding machine, the tight sleeve material is extruded into the mold at the same time, and the step is completed after the tight sleeve material is cooled through a three-stage water tank; the optical fiber paying-off tension is 1.2-1.3N, so that the paying-off of the optical fiber is kept stable in high-speed and low-speed states, and the take-up tension is 6-8N, so that the problem of unstable take-up during the conversion between the high-speed state and the low-speed state is solved; the extrusion temperature is 210 +/-3 ℃ in the 1 region, 230 +/-3 ℃ in the 2 region, 250 +/-3 ℃ in the 3 region, 250 +/-3 ℃ in the 4 region, 260 +/-3 ℃ in the 5 region, 260 +/-3 ℃ in the head, 260 +/-3 ℃ in the die orifice, the water tank adopts a segmented water tank, the temperature of the first section of water tank is 65 +/-3 ℃, the temperature of the second section of water tank is 40 +/-3 ℃ and the temperature of the third section of water tank is 21 +/-3 ℃, the segmented cooling effect is achieved, the stress in the material of the tight sleeve layer is eliminated, and the stress on the optical fiber is ensured to be within; the extrusion speed is 20m/min-40m/min, and the degree of vacuum is adjusted to make the stripping force of the coating layer 5-8N.

Step two, forming a sheath layer: discharging the tightly sleeved optical fiber and the two reinforcing pieces formed in the step through a pay-off rack with constant tension, wherein the two reinforcing pieces are positioned at two sides of the tightly sleeved optical fiber, a sheath mold matched with the sheath is arranged on the plastic extruding machine through the plastic extruding machine, a sheath layer material is extruded into the mold at the same time, and the step is completed after the two reinforcing pieces are cooled through a secondary water tank; the paying-off tension of the tight-buffered optical fiber is 1.5-1.6N, so that the paying-off of the optical fiber is kept stable in high-speed and low-speed states, the paying-off tension of the steel wire is 6-7N, and the take-up tension is 60 +/-0.3N, and the problem of unstable take-up during the conversion between the high-speed state and the low-speed state is avoided; the extrusion temperature is controlled to be 120 +/-3 ℃ in the region 1, 120 +/-3 ℃ in the region 2, 135 +/-3 ℃ in the region 3, 14 +/-3 ℃ in the region 4, 145 +/-3 ℃ in the region 5, 145 +/-3 ℃ in the head, 150 +/-3 ℃ in the die orifice, the water tank adopts a segmented water tank, the temperature of the water tank in the first segment is 60 +/-3 ℃, the temperature of the water tank in the second segment is 21 +/-3 ℃, the segmented cooling effect is achieved, the stress in the material of the tight-sleeved layer is eliminated, and the stress on the optical fiber is ensured to be within a; the extrusion molding speed is 20m/min-30m/min, the vacuum degree is adjusted to ensure that the stripping force of the coating is 2.5-10N, and the material of the outer protective coating is polyvinyl chloride.

The manufacturing method of the invisible butterfly-shaped optical cable is characterized in that the tight sleeve mold consists of a tight sleeve mold core and a tight sleeve mold sleeve, the tight sleeve mold core is provided with an optical fiber wire passing hole, and the outer diameter of the optical fiber wire passing hole is 0.27 +/-0.02 mm; the outer diameter of the tight sleeve die sleeve is 0.9 +/-0.05 mm.

The manufacturing method of the invisible butterfly optical cable is characterized in that the sheath mold consists of a sheath mold core and a sheath mold sleeve, the sheath mold core is provided with a tight-sleeved optical fiber threading hole and reinforcement threading holes at two sides of the tight-sleeved optical fiber threading hole, the outer diameter of the tight-sleeved optical fiber threading hole is 1.0 +/-0.03 mm, and the reinforcement threading hole is 0.48 +/-0.03 mm; the outer diameter of the sheath die sleeve is (2 multiplied by 3) +/-0.1 mm.

Through repeated tests of the applicant, the tight sleeve layer material is found to have excellent performance by adopting the following material formula by weight: 100 parts of polyamide, 15 parts of aluminum hydroxide, 13 parts of magnesium hydroxide, 14 parts of maleic anhydride grafted ethylene vinyl acetate, 24 parts of zinc borate, 3 parts of antioxidant, 32 parts of modifier, 26 parts of lubricant, 4 parts of zinc stearate, 12 parts of di (2-ethylhexyl) phthalate, 45 parts of ethylene bis-12-hydroxystearamide, 3 parts of magnesium stearate, 7 parts of aluminum tripolyphosphate, 16 parts of diisooctyl azelate, 2 parts of cancrinite, 30 parts of ethylene-chlorotrifluoroethylene copolymer and 5 parts of zinc aluminate.

The tight sleeve material obtained by adopting the formula has Shore hardness of 83, and the first part of the characteristic of the ant-proof sheath material for the YD/T1020-2004 cable and optical cable is as follows: the Shore hardness standard specified by the polyamide is more than or equal to 67, and exceeds the minimum requirement of YD/T1020-2004 by 23.88 percent compared with the common nylon material; the tensile strength is 52Mpa, the tensile strength standard specified by the YD/T1020-2004 standard is more than or equal to 40Mpa and exceeds the minimum requirement of the YD/T1020-2004 standard by 30 percent, so that the tight sleeve layer has better compression resistance and tensile property.

The cable has the advantages of simple structure, easy manufacture, good tensile resistance and compression resistance, transparency, invisibility, no damage to indoor decoration style during installation and the like.

The tight sleeve layer is convenient to manufacture, easy to form, high in hardness and good in tensile property.

The sheath layer is convenient to manufacture, and the cable production speed is high, the cable is easy to form, and the tensile property is good.

Drawings

Fig. 1 is a schematic perspective view of an optical cable manufactured according to the present invention.

In the figure: 1. the optical fiber comprises an outer protective layer, 2 reinforcing parts, 3 tight sleeve layers and 4 optical fibers.

Example 1:

an invisible butterfly optical cable comprises an optical fiber 4, a tight-buffered layer 3 extruded outside the optical fiber 4, reinforcing members 2 positioned at two sides of the tight-buffered layer 3, and an outer protective layer 1 extruded outside the reinforcing members 2 and the tight-buffered layer 3, wherein the tight-buffered layer is transparent in color; the manufacturing method comprises the following steps:

step one, forming a tight sleeve layer: the optical fiber is discharged through a pay-off rack with constant tension, passes through a plastic extruding machine, a tight sleeve mold matched with the tight sleeve is arranged on the plastic extruding machine, the tight sleeve material is extruded into the mold at the same time, and the step is completed after the tight sleeve material is cooled through a three-stage water tank; the optical fiber paying-off tension is 1.2-1.3N, so that the paying-off of the optical fiber is kept stable in high-speed and low-speed states, and the take-up tension is 6-8N, so that the problem of unstable take-up during the conversion between the high-speed state and the low-speed state is solved; the extrusion temperature is 210 +/-3 ℃ in the 1 region, 230 +/-3 ℃ in the 2 region, 250 +/-3 ℃ in the 3 region, 250 +/-3 ℃ in the 4 region, 260 +/-3 ℃ in the 5 region, 260 +/-3 ℃ in the head, 260 +/-3 ℃ in the die orifice, the water tank adopts a segmented water tank, the temperature of the first section of water tank is 65 +/-3 ℃, the temperature of the second section of water tank is 40 +/-3 ℃ and the temperature of the third section of water tank is 21 +/-3 ℃, the segmented cooling effect is achieved, the stress in the material of the tight sleeve layer is eliminated, and the stress on the optical fiber is ensured to be within; the extrusion speed is 20m/min-40m/min, and the degree of vacuum is adjusted to make the stripping force of the coating layer 5-8N.

Step two, forming a sheath layer: discharging the tightly sleeved optical fiber and the two reinforcing pieces formed in the step through a pay-off rack with constant tension, wherein the two reinforcing pieces are positioned at two sides of the tightly sleeved optical fiber, a sheath mold matched with the sheath is arranged on the plastic extruding machine through the plastic extruding machine, a sheath layer material is extruded into the mold at the same time, and the step is completed after the two reinforcing pieces are cooled through a secondary water tank; the paying-off tension of the tight-buffered optical fiber is 1.5-1.6N, so that the paying-off of the optical fiber is kept stable in high-speed and low-speed states, the paying-off tension of the steel wire is 6-7N, and the take-up tension is 60 +/-0.3N, and the problem of unstable take-up during the conversion between the high-speed state and the low-speed state is avoided; the extrusion molding temperature is controlled to be 140 +/-3 ℃ in the region 1, 145 +/-3 ℃ in the region 2, 150 +/-3 ℃ in the region 3, 160 +/-3 ℃ in the region 4, 165 +/-3 ℃ in the region 5, 165 +/-3 ℃ in the head, 170 +/-3 ℃ in the die orifice, the water tank adopts a segmented water tank, the temperature of the water tank in the first segment is 60 +/-3 ℃, the temperature of the water tank in the second segment is 21 +/-3 ℃, the segmented cooling effect is achieved, the stress in the material of the tight-buffered material is eliminated, and the stress on the optical fiber is ensured to be within; the extrusion speed is 20m/min-30m/min, and the degree of vacuum is adjusted so that the peeling force of the coating layer is 2.5-10N.

The manufacturing method of the invisible butterfly-shaped optical cable is characterized in that the tight sleeve mold consists of a tight sleeve mold core and a tight sleeve mold sleeve, the tight sleeve mold core is provided with an optical fiber wire passing hole, and the outer diameter of the optical fiber wire passing hole is 0.27 +/-0.02 mm; the outer diameter of the tight sleeve die sleeve is 0.9 +/-0.05 mm.

The manufacturing method of the invisible butterfly optical cable is characterized in that the sheath mold consists of a sheath mold core and a sheath mold sleeve, the sheath mold core is provided with a tight-sleeved optical fiber threading hole and reinforcement threading holes at two sides of the tight-sleeved optical fiber threading hole, the outer diameter of the tight-sleeved optical fiber threading hole is 1.0 +/-0.03 mm, and the reinforcement threading hole is 0.48 +/-0.03 mm; the outer diameter of the sheath die sleeve is (2 multiplied by 3) +/-0.1 mm.

Through repeated tests of the applicant, the tight sleeve layer material is found to have excellent performance by adopting the following material formula by weight: 100 parts of polyamide, 15 parts of aluminum hydroxide, 13 parts of magnesium hydroxide, 14 parts of maleic anhydride grafted ethylene vinyl acetate, 24 parts of zinc borate, 3 parts of antioxidant, 32 parts of modifier, 26 parts of lubricant, 4 parts of zinc stearate, 12 parts of di (2-ethylhexyl) phthalate, 45 parts of ethylene bis-12-hydroxystearamide, 3 parts of magnesium stearate, 7 parts of aluminum tripolyphosphate, 16 parts of diisooctyl azelate, 2 parts of cancrinite, 30 parts of ethylene-chlorotrifluoroethylene copolymer and 5 parts of zinc aluminate.

The tight sleeve material obtained by adopting the formula has Shore hardness of 83, and the first part of the characteristic of the ant-proof sheath material for the YD/T1020-2004 cable and optical cable is as follows: the Shore hardness standard specified by the polyamide is more than or equal to 67, and exceeds the minimum requirement of YD/T1020-2004 by 23.88 percent compared with the common nylon material; the tensile strength is 52Mpa, the tensile strength standard specified by the YD/T1020-2004 standard is more than or equal to 40Mpa and exceeds the minimum requirement of the YD/T1020-2004 standard by 30 percent, so that the tight sleeve layer has better compression resistance and tensile property.

Through repeated tests of an applicant, the outer protective layer material is found to have excellent formula performance by adopting the following materials, by weight, 100 parts of matrix resin, 80 parts of flame retardant, 3 parts of silane coupling agent, 13 parts of polymethylsiloxane and polyethylene wax, 10 parts of carbon black, 8 parts of ferric oxide, 3 parts of zinc oxide, 9 parts of vulcanizing agent, 43 parts of silicone rubber, 6 parts of magnesium oxide, 1 part of clay, 5 parts of calcium metasilicate, 20 parts of polyolefin elastomer, 3 parts of paraffin oil, 12 parts of dicumyl peroxide, 3 parts of antimonous oxide, 14 parts of vinyl tri (β -methoxy ethoxy) silane and 4 parts of montmorillonite.

The tensile strength of the tight-buffered material obtained by adopting the formula is 12.4Mpa, and the tensile strength standard of the halogen-free low-smoke flame-retardant material for the YD/T1113-2015 communication cable and cable is not less than 10Mpa and exceeds the minimum requirement of YD/T1113-2015 standard by 24%, so that the cable has better tensile property.