CN102096163B - Method for producing sheath of nylon cable and extrusion die thereof - Google Patents
Method for producing sheath of nylon cable and extrusion die thereof Download PDFInfo
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- CN102096163B CN102096163B CN2011100037784A CN201110003778A CN102096163B CN 102096163 B CN102096163 B CN 102096163B CN 2011100037784 A CN2011100037784 A CN 2011100037784A CN 201110003778 A CN201110003778 A CN 201110003778A CN 102096163 B CN102096163 B CN 102096163B
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- 239000004677 Nylon Substances 0.000 title claims abstract description 55
- 229920001778 nylon Polymers 0.000 title claims abstract description 55
- 238000001125 extrusion Methods 0.000 title claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 title abstract description 9
- 239000003365 glass fiber Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 12
- 230000004323 axial length Effects 0.000 claims abstract description 10
- 238000009413 insulation Methods 0.000 claims abstract description 10
- 230000003287 optical effect Effects 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 15
- 241001468684 Diplocardia Species 0.000 claims description 13
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000005452 bending Methods 0.000 abstract description 7
- 239000004698 Polyethylene Substances 0.000 abstract 6
- 229920000573 polyethylene Polymers 0.000 abstract 6
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- -1 polyethylene Polymers 0.000 abstract 1
- 239000011148 porous material Substances 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 9
- 235000009854 Cucurbita moschata Nutrition 0.000 description 2
- 240000001980 Cucurbita pepo Species 0.000 description 2
- 235000009852 Cucurbita pepo Nutrition 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 235000020354 squash Nutrition 0.000 description 2
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 241000283984 Rodentia Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a method for producing a sheath of a nylon cable and an extrusion die thereof. The method comprises the following steps of: predrying, forming a primary polyethylene (PE) sheath, forming a primary waterproof tape, forming a glass fiber layer, forming a secondary waterproof tape, forming a secondary PE sheath, and the like, wherein the secondary PE sheath is molded by a semi-extrusion die; a cable core covered by the secondary PE sheath is dried and preheated; and the nylon sheath is molded by a double-core inner die. In the semi-extrusion die, the axial length of an inner die extrusion part is not more than 5mm, and the axial length of an extrusion hole of an outer die is not more than 3mm. An inner die of the double-core inner die consists of a cable core heat-insulation supporting tube and an inner die core, wherein the cable core heat-insulation supporting tube is supported in a supporting hole in the center of the inner die core through a plurality of supporting ribs which are distributed on the circumference of the front end; the extrusion part at the front end of the inner die core passes through the extrusion hole to extend out of a corresponding end face of the outer die for 1 to 1.5mm; and the difference between the pore diameter of the extrusion hole and the outer diameter of the extrusion part is 2.8mm to -4.0mm. The invention has the advantages that: the adhesive strength between nylon and the PE sheath is greatly improved; therefore, the bending index and other properties of finished products are effectively improved.
Description
Technical field
The present invention relates to the optical cable production technical field, relate in particular to a kind of sheath working method and extrusion die thereof of nylon optical cable.
Background technology
The nylon optical cable is a kind of special optical cable, have protection against rodents, termite-proof, physical strength is high, and is heat-resisting, wear-resistant, oil resistant, characteristics such as weak acid resistant, electrical insulating property are good have purposes widely.The structure of this kind optical cable such as Fig. 4.It is produced, and main process cover is moulded, layer strand and sheath three operation.Cover is moulded operation and mainly some primary coating fibres 1 is carried out secondary coatedly, forms loose sleeve pipe, with the tension that improves optical fiber, mechanical property 3 such as counter-bending; Layer strand operation is that some loose sleeve pipes and gasket for packing 10 spirals are stranded on the center stiffener 6, puts band 5 in its outside, and interior the filling by cable cream of band forms basic cable core, with the further physical strength that improves pine pipe inner fiber; The sheath operation is squeezed into protective seam exactly on basic cable core, make optical cable core not receive the influence of extraneous heat, humidity, mechanical effect, chemical erosion, and reach the ant-proof mouse-proof requirement.
General sheath operation mainly comprises steps such as the setting of a PE restrictive coating, water blocking tape layer setting, the setting of glass fiber layer, secondary PE restrictive coating setting and nylon sheath wire layer are provided with.PE restrictive coating wherein and nylon sheath wire layer are to adopt squash type (or crowded tubular type) mould that PE material or nylon material are expressed on the corresponding cable core, and the quality of the surface quality of finished product and secondary PE sheath is closely related.Because of the cable core before the second time PE sheath is nonmetal cable core, the surface has glass fiber and waterstop to cover, and the PE thinner thickness is merely 1.2mm, and it is obvious to handle the bad bundle yarn vestige that will make, and outward appearance is rounding not.So the optical cable of existing manufacturing technique and die production blibbing, wrinkling occur through regular meeting; In addition, the bending property of optical cable is relatively poor, in construction, also is prone to the phenomenon of bending crack; Thereby the qualification rate that finished product is produced in batches is low, and the problems referred to above are failed fine being resolved always.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned prior art, and propose a kind of sheath working method and extrusion die thereof of nylon optical cable, realize by following technical scheme:
Said sheath working method comprises the steps: 1) form a PE sheath, the basic cable core of said optical cable, the extruding of tearing a rope and a PE sheath mould of PE material warp are at PE sheath of the peripheral formation of said cable core; 2) form a waterstop, the cable core with above-mentioned PE sheath forms a waterstop through vertical wrap molding machine a PE sheath periphery; 3) form the glass fiber layer, it is stranded through stranding machine by glass fiber to have an above-mentioned cable core that protects waterstop, at the peripheral glass fiber layer that forms of an above-mentioned waterstop; 4) form the secondary waterstop, the cable core with above-mentioned glass fiber layer wraps in the peripheral secondary waterstop that forms of glass fiber layer by waterstop through the vertical of vertical wrap molding machine, and places in this water blocking tape layer outside. tear rope; 5) form secondary PE sheath, have above-mentioned secondary waterstop cable core, tear rope and PE material through the extruding of secondary PE sheath mould, form secondary PE sheath; 6) form nylon sheath wire, the cable core with secondary PE sheath is formed the nylon optical cable with nylon sheath wire, and is cooled off through tank by nylon material and corresponding extruding through the nylon sheath wire mould, it is characterized in that
Said nylon material is carried out predrying, baking temperature is controlled at 100 ± 10 ℃, drying time 12～14h;
Secondary PE sheath mould adopts half plsitive mold, and in the control mould negative pressure of extrusion mouth-6～-9kpa;
Said cable core with secondary PE sheath is carried out drying, preheating, make this cable core in the temperature that gets into nylon sheath wire die entrance place at 60～65 ℃;
Said nylon sheath wire mould adopts diplocardia internal mold mould;
Said tank places in diplocardia internal mold mould extrusion 1.0～1.5m horizontal range, and the trough inner water temperature is at 40～45 ℃.
Said cable core drying with secondary PE sheath is to adopt pressurized air that said cable core is brushed, and compressed-air actuated pressure control is at 0.2～0.4Mpa.
Said preheating is to adopt the liquefied gas flame jet; Two flames are symmetrically placed in apart from said diplocardia internal mold die entrance 0.5～1.0m place; Said cable core travelling speed is controlled at 30-40m/min, makes this cable core be controlled at 60～65 ℃ in the temperature that gets into nylon sheath wire die entrance place.
Described half plsitive mold is made up of internal mold and external mold, and said internal mold front end is provided with circle and extrudes portion; Said external mold center is provided with corresponding interior nib; Interior nib front end is an extrusion cavities; Internal mold inserts in the interior nib of external mold, and the portion of extruding of internal mold is in the extrusion cavities of external mold center, and the axial length that wherein said internal mold is extruded portion is not more than 5mm; The axial length of extrusion cavities is not more than 3mm, and the corresponding end face of external mold does not stretch out in the portion of extruding.
Described diplocardia internal mold mould; Comprise external mold and internal mold, wherein said internal mold is made up of heat insulation stay pipe of cable core and inner mould core, and several supporting ribs that the heat insulation stay pipe of said cable core upwards distributed through its front end week are bearing in the supported hole at inner mould core center; And be connected with inner mould core; The inner mould core front end is provided with circle and extrudes portion, and the external mold center is provided with interior nib, and internal mold inserts in the interior nib of external mold; And the portion of extruding that makes the inner mould core front end passes extrusion cavities and stretches out corresponding end face 1～1.5 mm of external mold, and the aperture of extrusion cavities is 2.8～-4.0 mm with the difference of extruding the external diameter of portion.
Set up preheating device on the production line of the present invention before the nylon sheath wire layer; The flame of placing with two symmetries is carrying out preheating apart from extrusion die vacuum inlet place to cable core; Adjustment through flame size guarantees secondary PE restrictive coating (below be referred to as " in protect ") and nylon layer adhesion; Increase nylon layer and in peel strength between protecting, guaranteed the bending property of optical cable; The 2nd PE restrictive coating that the present invention forms through half plsitive mold, the surface is more smooth, has solved the bundle yarn mark problem of cable core.The present invention also through the diplocardia internal model structure, guarantees that through four supporting ribs on the heat insulation stay pipe of cable core its concentricity is consistent with inner mould core, is beneficial to nylon layer degree of eccentricity Fast Adjustable.Because cable core is when extruding, cable core is direct die orifice outlet wall in the contact, thus guarantee cable core when the nylon sheath in same periphery the consistance of temperature.Effectively solve the cable core inequality of being heated and cause after the nylon layer bending abnormal occurrencies such as outward appearance is wrinkling, guaranteed that the outlet temperature of head is even, guaranteed the stable of nylon sheath wire peeling resistance.
Description of drawings
Fig. 1 is the structural representation of half plsitive mold.
Fig. 2 is the structural representation of diplocardia internal mold.
Fig. 3 is the structural representation of the heat insulation stay pipe of cable core in the mould shown in Figure 2.
Fig. 4 is the structural representation of nylon optical cable.
Embodiment
In nylon cable jacket working method of the present invention, adopt half plsitive mold to push and form secondary PE sheath, this mould structure is as shown in Figure 1.Form by internal mold 2 and external mold 1.The front end of internal mold 2 comprises a cone; The front end of the contraction of this cone is provided with circle and extrudes portion 21; The center of external mold 1 is provided with the interior nib 12 of the taper corresponding with internal mold; Internal mold 2 is plugged in the external mold through the interior nib 12 through external mold 1 center, extrudes portion 21 and forms the annular gap that supplies the PE material to extrude with interior nib 12.The front end of the portion that extrudes 21 of internal mold is in the extrusion cavities 11 of external mold, and the axial length l that extrudes portion 21 is not more than 5mm, has lacked many than the existing axial length 15mm that extrudes portion.The axial length l of extrusion cavities 11 is not more than 3mm, has also lacked many than existing extrusion cavities axial length 12mm.Extrude portion 21 and do not stretch out extrusion cavities 11, and in external mold corresponding end face 2mm.This kind structure has had both the advantage of common crowded tubular type and plsitive mold; Effectively solving the out-of-flatness of secondary PE sheath outward appearance has the caducous technical barrier of PE sheath (squash type) in the yarn of bundle trace (squeezing tubular type) and the production, for beautiful outward appearance of nylon sheath wire layer and sheath performance stable provides necessary guarantee.
Among the present invention, through the extruding formation nylon sheath wire of diplocardia internal mold mould, the structure of this mould such as Fig. 2, shown in Figure 3.It also is made up of external mold 4 and internal mold 5, but internal mold 5 is subassemblies, is made up of with inner mould core 51 the heat insulation stay pipe 52 of cable core.The heat insulation stay pipe 52 of cable core is bearing in the supported hole at inner mould core center through 4 supporting rib 51a that upwards distribute in week of its front end, and its rear end is connected with inner mould core 51 spirals.Inner mould core 51 comprises a cone, and the front end that shrinks in this cone is provided with circle and extrudes portion 52, and the center of external mold 4 is provided with the interior nib 41 corresponding to above-mentioned internal mold 5, and the front end of interior nib 41 is an extrusion cavities 42, in inner membrance 5 is plugged in the nib 41.The end face 1mm of the portion that the extrudes 52 outstanding external molds of inner mould core 51 front ends during installation.This structure is not adsorbed on mould and the head nylon material that melts when extruding discharge, is more conducive to clean and eccentric adjustment.The aperture D1 of extrusion cavities is 2.8～4.0 mm with the difference of extruding the D outer diameter 2 of portion, makes the ratio (degree of eccentricity) of minimum and maximum of the thickness of nylon sheath wire layer be not less than 0.85.
Before the production, at first the nylon sheath wire material is carried out predryingly, baking temperature is controlled at 100 ± 10 ℃, drying time 12～14h.
When carrying out the sheath production process of nylon optical cable; Tear rope 109 (referring to Fig. 4) in the basic cable core parallel placement in the outside; The basis cable core, tear rope 109 with the PE material through the extruding of a PE restrictive coating mould, at basic cable core and tear PE sheath 113 of rope 109 peripheral formation.The cable core that then has this PE sheath 113 forms a waterstop 111 through vertical wrap molding machine a PE sheath periphery.Cable core with a waterstop 111 continues to move to glass fiber through stranding machine, and is stranded through this machine, at the waterstop 111 peripheral glass fiber layers 107 that form.The cable core that has glass fiber layer 107 runs to the vertical wrap molding machine inlet of secondary waterstop, through indulging the vertical peripheral waterstop 110 for the second time that forms of glass fiber layer that wrap in of wrap molding machine.Tear rope 108 at this about 5m of endpiece at vertical wrap molding machine along the placement of cable core traffic direction, this tears secondary waterstop 110 outsides that rope is positioned at current cable core.When cable core moves to above-mentioned half plsitive mold, cable core, tear rope and the secondary waterstop gets into above-mentioned mould extruding, the negative pressure of extrusion mouth is controlled at-6～-9kpa, form secondary PE restrictive coating 114.The cable core that formation is had secondary PE restrictive coating carries out first drying.The dry pressurized air that adopts brushes current cable core, and compressed-air actuated pressure control is at 0.2～0.4Mpa.Carry out preheating then; Preheating is to adopt the liquefied gas flame jet; Two flames are symmetrically placed in apart from nylon sheath wire layer extrusion die inlet 0.5～1.0m place, and this moment, the cable core travelling speed was controlled at 30-40m/min, make this cable core be controlled at 60～65 ℃ in the temperature that gets into nylon sheath wire die entrance place.At last; Cable core and nylon material with secondary PE sheath 114 form outermost nylon sheath wire through the extruding of diplocardia internal mold mould; Become the nylon optical cable; This nylon optical cable moves in the tank of diplocardia internal mold mould extrusion 1.0～1.5m horizontal range, cools off, and the water temperature of tank is controlled at 40～45 ℃.
The nylon optical cable that said method and jacket extrusion mould are produced, the cohesive strength between its nylon and PE sheath strengthens greatly, thereby effectively guarantees the bending property of finished product.Show that through stretching experiment when short-term pulling force 3000N, fibre strain is less than 0.02%, attenuation change is less than 0.02dB, and surfacing is smooth; Show through high low temperature test: optical cable can long-term work under-40 ℃～+ 70 ℃ environment; Guarantee that product performance index reaches good.
Claims (3)
1. the sheath working method of a nylon optical cable comprises the steps: 1) form a PE sheath, the basic cable core of said optical cable, the extruding of tearing a rope and a PE sheath mould of PE material warp are at PE sheath of the peripheral formation of said cable core; 2) form a waterstop, the cable core with above-mentioned PE sheath forms a waterstop through vertical wrap molding machine a PE sheath periphery; 3) form the glass fiber layer, the cable core with above-mentioned waterstop is stranded through stranding machine by glass fiber, at the peripheral glass fiber layer that forms of an above-mentioned waterstop; 4) form the secondary waterstop, the cable core with above-mentioned glass fiber layer is by vertical wrap in glass fiber layer peripheral the form secondary waterstop of waterstop through vertical wrap molding machine; 5) form secondary PE sheath, have above-mentioned secondary waterstop cable core, tear rope and PE material through the extruding of secondary PE sheath mould, form secondary PE sheath; 6) form nylon sheath wire; Cable core with secondary PE sheath is by nylon material and corresponding extruding through the nylon sheath wire mould; Formation has the nylon optical cable of nylon sheath wire, and cools off through tank, it is characterized in that carrying out predrying to said nylon material; Baking temperature is controlled at 100 ± 10 ℃, drying time 12～14h;
Secondary PE sheath mould adopts half plsitive mold, and in the control mould negative pressure of extrusion mouth-6～-9kpa, described half plsitive mold is made up of internal mold and external mold, said internal mold front end is provided with circle and extrudes portion; Said external mold center is provided with corresponding interior nib; Interior nib front end is an extrusion cavities; Internal mold inserts in the interior nib of external mold, and the portion of extruding of internal mold is in the extrusion cavities of external mold center, it is characterized in that said internal mold extrudes the axial length of portion and be not more than 5mm; The axial length of extrusion cavities is not more than 3mm, and the corresponding end face of external mold does not stretch out in the portion of extruding;
Said cable core with secondary PE sheath is carried out drying, preheating, make this cable core in the temperature that gets into nylon sheath wire die entrance place at 60～65 ℃;
Said nylon sheath wire mould adopts diplocardia internal mold mould, and said diplocardia internal mold mould comprises external mold and internal mold, it is characterized in that said internal mold is made up of heat insulation stay pipe of cable core and inner mould core; Several supporting ribs that the heat insulation stay pipe of said cable core upwards distributed through its front end week are bearing in the supported hole at inner mould core center; And be connected with inner mould core, the inner mould core front end is provided with circle and extrudes portion, and the external mold center is provided with interior nib; Interior nib front end is an extrusion cavities; Internal mold inserts in the interior nib of external mold, and makes the portion of extruding of inner mould core front end pass extrusion cavities to stretch out corresponding end face 1～1.5 mm of external mold, and the aperture of extrusion cavities is 2.8～4.0 mm with the difference of extruding the external diameter of portion;
Said tank places in diplocardia internal mold mould extrusion 1.0～1.5m horizontal range, and the trough inner water temperature is at 40～45 ℃.
2. the sheath working method of a kind of nylon optical cable according to claim 1 is characterized in that to said cable core drying with secondary PE sheath it being to adopt pressurized air that said cable core is brushed, and compressed-air actuated pressure control is at 0.2～0.4Mpa.
3. the sheath working method of a kind of nylon optical cable according to claim 1; It is characterized in that said preheating is to adopt the liquefied gas flame jet; Two flames are symmetrically placed in apart from said diplocardia internal mold die entrance 0.5～1.0m place; Said cable core travelling speed is controlled at 30-40m/min, makes this cable core be controlled at 60～65 ℃ in the temperature that gets into nylon sheath wire die entrance place.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100037784A CN102096163B (en) | 2011-01-10 | 2011-01-10 | Method for producing sheath of nylon cable and extrusion die thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100037784A CN102096163B (en) | 2011-01-10 | 2011-01-10 | Method for producing sheath of nylon cable and extrusion die thereof |
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| CN102096163A CN102096163A (en) | 2011-06-15 |
| CN102096163B true CN102096163B (en) | 2012-07-04 |
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Cited By (1)
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| CN103163610A (en) * | 2012-12-19 | 2013-06-19 | 南京烽火藤仓光通信有限公司 | Tightly sleeved optical cable and mold thereof |
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| GB8808039D0 (en) * | 1988-04-06 | 1988-05-05 | Bicc Plc | Manufacture of circumferentially rigid flexible tube for optical cable |
| US6415085B1 (en) * | 1995-08-01 | 2002-07-02 | At&T Corp. | Sub-miniature optical fiber cables, and apparatuses and methods for making the sub-miniature optical fiber cables |
| JP5207652B2 (en) * | 2007-04-06 | 2013-06-12 | 三菱レイヨン株式会社 | Manufacturing method of plastic optical fiber cable |
| CN201449476U (en) * | 2009-06-26 | 2010-05-05 | 特恩驰(南京)光纤有限公司 | Indoor optical cable |
| CN201518253U (en) * | 2009-11-03 | 2010-06-30 | 江苏永鼎股份有限公司 | Plastic wire and cable squeeze extrusion mold |
| CN201600480U (en) * | 2010-02-03 | 2010-10-06 | 汕头高新区奥星光通信设备有限公司 | Sheath extrusion mould of a central tube type ribbon optical fiber cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103163610A (en) * | 2012-12-19 | 2013-06-19 | 南京烽火藤仓光通信有限公司 | Tightly sleeved optical cable and mold thereof |
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Address after: 210038, No. 76, Xingang Avenue, Nanjing economic and Technological Development Zone, Qixia District, Jiangsu, Nanjing Patentee after: NANJING WASIN FUJIKURA OPTICAL COMMUNICATION LTD. Address before: 210038, No. 76, Xingang Avenue, Nanjing economic and Technological Development Zone, Qixia District, Jiangsu, Nanjing Patentee before: Nanjing Fiberhome Fujikura Optical Communication Ltd. |
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Inventor after: Zheng Ming Inventor after: Zou Yuanhu Inventor before: Zheng Ming |
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Effective date of registration: 20201016 Address after: 311300 Qing Ke village, Jincheng Street, Ling'an District, Hangzhou, Zhejiang Patentee after: HANGZHOU JINLONG OPTICAL CABLE Co.,Ltd. Address before: 210038, No. 76, Xingang Avenue, Nanjing economic and Technological Development Zone, Qixia District, Jiangsu, Nanjing Patentee before: NANJING WASIN FUJIKURA OPTICAL COMMUNICATION Ltd. |
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Effective date of registration: 20210202 Address after: 210038 No. 76 Xingang Avenue, Nanjing economic and Technological Development Zone, Jiangsu Patentee after: NANJING WASIN FUJIKURA OPTICAL COMMUNICATION Ltd. Address before: 311300 Qing Ke village, Jincheng Street, Ling'an District, Hangzhou, Zhejiang Patentee before: HANGZHOU JINLONG OPTICAL CABLE Co.,Ltd. |
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