CN103869434A - Plastic coating technology of sheath for plastic optical fiber - Google Patents
Plastic coating technology of sheath for plastic optical fiber Download PDFInfo
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- CN103869434A CN103869434A CN201410068435.XA CN201410068435A CN103869434A CN 103869434 A CN103869434 A CN 103869434A CN 201410068435 A CN201410068435 A CN 201410068435A CN 103869434 A CN103869434 A CN 103869434A
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- 239000013308 plastic optical fiber Substances 0.000 title claims abstract description 67
- 238000005516 engineering process Methods 0.000 title abstract description 6
- 239000006223 plastic coating Substances 0.000 title abstract 6
- 239000000463 material Substances 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 38
- 238000000576 coating method Methods 0.000 claims abstract description 36
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 22
- 239000001301 oxygen Substances 0.000 claims abstract description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 21
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 7
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- 238000001771 vacuum deposition Methods 0.000 claims description 8
- 241000606750 Actinobacillus Species 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 6
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 4
- 229920001169 thermoplastic Polymers 0.000 claims description 4
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- HGAZMNJKRQFZKS-UHFFFAOYSA-N chloroethene;ethenyl acetate Chemical compound ClC=C.CC(=O)OC=C HGAZMNJKRQFZKS-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a plastic coating technology of a sheath for a plastic optical fiber. The plastic coating process is completed by a two-step method, wherein in the first step, an oxygen insulation protection layer is coated, and in the second step, a light shielding layer is coated; in the coating process, a thermoplastic material coats a methyl methacrylate fiber core under the vacuum condition; due to the combination of a vacuum condition with proper pressure and proper core mould/opening mould fit clearance, the radial pressure of a fusion sheath material on the optical fiber and the draw ratio of the sheath material in the plastic coating process are reduced, the drawing destruction to a naked fiber in the traction shaping process of the sheath is reduced, the cooling time of the sheath is short, the mechanical property is good, the attenuation coefficient increment of the optical fiber is less than or equal to 10 dm/km, the environment usage temperature is from 55 DEG C below zero to 85 DEG C, the optical fiber can be used under high temperature for a long time, and the performance is improved. The plastic coating technology of the sheath for the plastic optical fiber is suitable for plastic coating of the sheath for the plastic optical fiber.
Description
Technical field
The invention belongs to optical fiber cable communication and manufacture field, relate to a kind of preparation of plastic optical fiber periphery sheath, the cover that is specifically related to a kind of plastic optical fiber sheath is moulded technique.
Background technology
At present, the research and development of plastic optical fiber cable are one of the most popular research topics of industry, plastic optical fiber cable with low-loss, the advantage such as core diameter is large, pliability good, plasticity is strong, quality is light, cheap, immune electromagnetic interference (EMI) has been subject to the users' of all circles common concern.Plastic optical fiber not only can be for the last 100m of Access Network, also can be used for the field such as automobile MOST system, wind-power electricity generation, Industry Control and sensing, the transmission of motor-car signal, is desirable short-distance transmission medium.It is that present society is advocated low-carbon (LC) life, substitutes the environmental protection more of copper cable product, has more competitive product.
Plastic optical fiber (POF) is made up of plastic material, there is the shortcomings such as thermotolerance is poor, chemical stability is weak, physical strength is lower, in order to make POF avoid the injury of extraneous mechanical force, environmental change etc., conventionally at outside of fiber coating one deck or two-layer certain thickness plastic sheath.Common plastics optical cable be by methyl methacrylate (PMMA) as core material, fluoropolymer is as cortical material, PVC/PE etc. form as restrictive coating material.The material that sheath is selected mainly contains following a few class: the thermoplastics such as vinyl chloride (PVC), tygon (PE), polypropylene (PP), crosslinked polyethylene (VPE), acetate ethylene copolymer (EVA), teflon-hexafluoropropylene (FEP) or teflon (PTPE).Select different sheath materials to there is different temperature application range.
In recent years, under the effort of plastic optical fiber manufacturer, Chinese Plastics optical fiber is all obtained positive progress at cable producer face.Plastic optical fiber starting material can oneself be produced, and plastic optical fiber and optical cable loss can reach below 200dB/km substantially, and environment serviceability temperature scope is generally-40 ℃～70 ℃.But, for the relatively harsh place of environmental requirement, as automobile MOST, wind-power electricity generation, industrial and mineral sensing etc., this type of optical cable can not meet request for utilization, and except the material of plastic optical fiber sheath own, it is also to affect one of the loss of plastic optical fiber cable and factor of environment tolerable temperature that cover is moulded technique.
Plastic optical fiber is originally as superpolymer, glass transition temperature is between 100～120 ℃, and cover is moulded technological requirement temperature far away higher than its glass transition temperature, it is larger that cover is moulded in production run drafting force, cover is moulded and in process, is drawn type-approval process the drawing-off of naked fibre is destroyed, often fibre core itself is caused to irreversible damage, visualize is the fibre core increase that attenuates, decays.In the process that high temperature cover is moulded, drawing by high temperature destroys its apparent structure, scattering increases, and the residual monomer of sheath material and oligomer dissolve, are diffused into plastic optical fiber (POF) fibre core inside from primary coating and secondary coating, causes that the transmission loss of POF increases.In addition, cover is moulded in process when the existence of oxygen is at high temperature used it, and infiltration oxidative deformation, causes the increase of electron transfer, and attenuation incrementation is excessive.At present state's inner sleeve mould process using low temperature cover moulding material (as PE/PVC) produce attenuation coefficient increase all more than 30dB/km, as adopt high temperature resistant cover moulding material (as PET, PA, PTFE etc.) to produce attenuation coefficient increase all more than 100dB/km, thereby, overlapped and moulded the less method for producing sheath of technical study production attenuation coefficient increment by improvement, the performance that improves plastic optical fiber cable becomes a study hotspot in recent years.
Summary of the invention
The technical problem to be solved in the present invention; the cover that is to provide a kind of plastic optical fiber sheath is moulded technique; it adopts two-step approach to complete; the first step completes the coating of oxygen barrier protective seam; second step completes light shielding layer coating; coating process is coated on thermoplastic on methyl methacrylate fibre core under vacuum condition; this cover is moulded technique and has been reduced melting sheath material to optical fiber radial pressure and overlapped the ratio of drawing of moulding sheath material in process; having reduced sheath traction type-approval process destroys the drawing-off of naked fibre; the attenuation coefficient increment of optical fiber is little, environment serviceability temperature wide ranges.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
Plastic optical fiber is moulded a technique with the cover of sheath, and it adopts two-step approach to complete, and carries out according to following preparation process:
The coating of I oxygen barrier protective seam
(1) unwrapping wire
Utilize actinobacillus device using the plastic optical fiber active unwrapping wire under the permanent tension force of 10～30N that adopts methyl methacrylate as base material, obtain A;
Reasonably laying tension has gain effect to the attenuation factor of optical fiber, when laying tension is less than 10N, optical fiber is because microbend produces added losses, when laying tension is greater than 30N, tight tube fiber will produce unrelieved stress, cause plastic optical fiber to attenuate and produce higher additional attenuation because stretching;
(2) preheating
A is through infrared preheating device, and preheating at 60～100 ℃, obtains B;
(3) vacuum coating
B enters in extrusion device, and sheath material is put into extrusion device hopper, under vacuum, high temperature, extrudes, and obtains C;
(4) cooling
C is introduced into 35～50 ℃ of hot water storgaes with traction and carries out coolingly, then enters 10～20 ℃ of cold rinse banks and carries out coolingly, obtains D;
(5) drafting forming
Dry up D surface moisture through blowing dryer, after caliper detection is qualified, enter draw-gear drafting forming, haulage speed is 30～60m/min, obtains E;
(6) take-up
E enters in the control device that tension force is 10～20N, be wound on spool through take-up, obtain the product after the plastic optical fiber coating oxygen barrier protective seam using methyl methacrylate as base material, be that the plastic optical fiber of F(take methyl methacrylate as base material is core, periphery is coated with oxygen barrier protective seam);
The coating of II light shielding layer
(7) unwrapping wire
Utilize actinobacillus device by F active unwrapping wire under the permanent tension force of 20～30N, obtain G;
(8) preheating
G is through infrared preheating device, and preheating at 90～100 ℃, obtains H;
(9) vacuum coating
H enters in extrusion device, and sheath material is put into extrusion device hopper, under vacuum, high temperature, extrudes, and obtains I;
(10) cooling
I is introduced into 35～50 ℃ of hot water storgaes with traction and carries out coolingly, then enters 10～20 ℃ of cold rinse banks and carries out coolingly, obtains J;
(11) drafting forming
After blowing dryer dries up J surface moisture, after caliper detection is qualified, enter draw-gear drafting forming, haulage speed is 30～60m/min, obtains K;
(12) take-up
K enters in the control device that tension force is 10～20 N, is wound on spool through take-up, obtains plastic optical fiber product (plastic optical fiber take methyl methacrylate as base material is core, and periphery is coated with oxygen barrier protective seam, light shielding layer successively).
As a kind of restriction of the present invention, the extrusion temperature described in step (3) is: 175～185 ℃, a district, 185～200 ℃, 2nd district, 195～215 ℃, 3rd district, 200～220 ℃, machine neck, 190～205 ℃, head one district, 190～200 ℃, head 2nd district.
As another kind of restriction of the present invention, the extrusion temperature described in step (9) is: 175～185 ℃, a district, 190～210 ℃, 2nd district, 200～225 ℃, 3rd district, 210～220 ℃, machine neck, 200～215 ℃, head one district, 190～200 ℃, head 2nd district.
Limit as of the present invention the third, described sheath material is thermoplastic, putting into before extrusion device hopper, at 60～100 ℃, dries 90～150min.
As the 4th kind of restriction of the present invention, the coating of oxygen barrier protective seam is of a size of φ 1.5mm, and light shielding layer coating is of a size of φ 2.2mm.
As the 5th kind of restriction of the present invention, the vacuum pressure in step (3) is-0.04～-0.03MPa, and core/mouth mould tolerance clearance is 0.8～1.2mm.
As be less than-0.04MPa of step (3) vacuum pressure, when core/mouth mould tolerance clearance is greater than 1.2mm, because the suffered radial effect power of optical fiber is excessive, drawing-off axial force is excessive, optical fiber is by drawing-down, and apparent structure destroys, and sheath material infiltration strengthens optical fiber attenuation coefficient increment; As be greater than-0.03MPa of step (3) vacuum pressure, when core/mouth mould tolerance clearance is less than 1.2mm, or the suffered radial effect power of optical fiber is too small, hiding power deficiency, the sheath peeling force of coating is too small, can not meet the requirement (tight sleeve layer should be easy to divest and be no less than 20mm from optical fiber, its peel force should within the scope of 5～25N) of tight sleeve layer fissility in industry standard YD/T1447～2012.
The present invention also has a kind of restriction, the vacuum pressure-0.04～-0.03MPa in step (9), and core/mouth mould tolerance clearance is 0～0.5mm.
Plastic optical fiber of the present invention with the cover of sheath mould technique do as a whole, process be simply easy to control, prepared sheath good mechanical property, optical fiber attenuation coefficient increment is little, environment serviceability temperature wide ranges; Vacuum coating step of the present invention is for utilizing existing extrusion device to extrude operation under vacuum environment, as adopting vacuum, extrusion device squeezes pipe, or in existing extrusion device, increase a vacuum chamber, also extrusion device can be placed in to the inferior mode of vacuum environment, all can realize vacuum coating of the present invention.
Owing to having adopted above-mentioned technical scheme, compared with prior art, obtained technical progress is in the present invention:
The cover that the invention provides a kind of plastic optical fiber sheath is moulded technique, two step coating processes complete under vacuum condition, vacuum condition prevents that the residual monomer of sheath material in high temperature coating process and oligomer from dissolving, being diffused into plastic optical fiber (POF) fibre core inside from primary coating and secondary coating, the transmission loss that causes POF increases, in addition, also avoided because the at high temperature existence of oxygen makes POF infiltration oxidative deformation, attenuation coefficient increment is excessive, and the performance of optical fiber reduces.The combination in the vacuum condition of convenient pressure of the present invention and core/mouth mould proper fit gap, reduce melting sheath material to optical fiber radial pressure and overlapped the ratio of drawing of moulding sheath material in process, sheath traction type-approval process destroys and reduces the drawing-off of naked fibre, the cool time of sheath is short, good mechanical property, optical fiber attenuation coefficient increment≤10dm/km, environment serviceability temperature is-55～85 ℃, can under hot environment, use for a long time, the performance of optical fiber is improved.
The present invention is applicable to the cover of plastic optical fiber sheath and moulds.
The present invention is described in further detail below in conjunction with specific embodiment.
accompanying drawing explanation
Fig. 1 is the cross section structure schematic diagram with the product of sheath after plastic optical fiber cover of the present invention is moulded.
In figure: the plastic optical fiber of 1-using methyl methacrylate as base material; 2-oxygen barrier protective seam; 3-light shielding layer.
Embodiment
1 one kinds of plastic optical fibers of embodiment are moulded technique with the cover of sheath
The present embodiment is that the plastic optical fiber 1 take methyl methacrylate as base material is core, moulds technique in core periphery, cover the sheath being laminated by the oxygen barrier protective seam 2 of polypropylene material and the light shielding layer 3 of vinyl chloride material by cover.
This cover is moulded technique and is carried out according to following preparation process:
2 coatings of I φ 1.5mm oxygen barrier protective seam
(1) unwrapping wire
Utilize actinobacillus device using the plastic optical fiber 1 active unwrapping wire under 10N tension force that adopts methyl methacrylate as base material, obtain A1;
(2) preheating
A1 is through infrared preheating device, and preheating at 80 ℃, obtains B1;
(3) vacuum coating
B1 enters in extrusion device, vacuum pressure is-0.03MPa, core/mouth mould tolerance clearance is 1.2mm, 185 ℃, extrusion temperature Wei Yi district, 185 ℃, 2nd district, 215 ℃, 3rd district, 210 ℃, machine neck, 205 ℃, head one district, 190 ℃, head 2nd district, sheath material is polypropylene, at 70 ℃, dry 120min putting into squeeze before pipe device hopper, under high temperature, extrude, obtain C1;
(4) cooling
C1 is introduced into 50 ℃ of hot water storgaes with traction and carries out coolingly, then enters 15 ℃ of cold rinse banks and carries out coolingly, obtains D1;
(5) drafting forming
Dry up D1 surface moisture through blowing dryer, after caliper detection is qualified, enter draw-gear drafting forming, haulage speed is 35m/min, obtains E1;
(6) take-up
E1 enters in the control device that tension force is 20N, be wound on spool through take-up, obtain the goods after the plastic optical fiber 1 coating oxygen barrier protective seam 2 using methyl methacrylate as base material, be that the plastic optical fiber 1 of F1(take methyl methacrylate as base material is core, periphery is coated with oxygen barrier protective seam 2);
3 coatings of II φ 2.2mm light shielding layer
(7) unwrapping wire
Utilize actinobacillus device by F1 active unwrapping wire under the permanent tension force of 20N, obtain G1;
(8) preheating
G1 is through infrared preheating device, and preheating at 90 ℃, obtains H1;
(9) vacuum coating
H1 enters in extrusion device, vacuum pressure-0.04MPa, core/mouth mould tolerance clearance is 0mm, 185 ℃, extrusion temperature Wei Yi district, 190 ℃, 2nd district, 215 ℃, 3rd district, 210 ℃, machine neck, 205 ℃, head one district, 190 ℃, head 2nd district, sheath material is vinyl chloride, at 60 ℃, dry 120min putting into before extrusion device hopper, under high temperature, extrude, obtain I1;
(10) cooling
I1 is introduced into 35 ℃ of hot water storgaes with traction and carries out coolingly, then enters 10 ℃ of cold rinse banks and carries out coolingly, obtains J1;
(11) drafting forming
Dry up J1 surface moisture through blowing dryer, after caliper detection is qualified, enter draw-gear drafting forming, haulage speed is 60m/min, obtains K1;
(12) take-up
K1 enters in the control device that tension force is 10 N, is wound on spool through take-up, must be with the plastic optical fiber product of sheath.
Figure 1 shows that cover mould after with the structural representation of the product of sheath, it is that plastic optical fiber 1 take methyl methacrylate as base material is core, periphery is coated with oxygen barrier protective seam 2, light shielding layer 3 successively.
It is short that the present embodiment cover is moulded in process the cool time of sheath, good mechanical property, optical fiber attenuation coefficient increment is 8dm/km, the sheath peeling force of coating is 23.5N, (tight sleeve layer should be easy to divest and be no less than 20mm from optical fiber to meet the requirement of tight sleeve layer fissility in industry standard YD/T1447～2012, its peel force should be within the scope of 5～25N), environment serviceability temperature is-55～85 ℃, optical fiber can use for a long time under hot environment.
embodiment 2-8 plastic optical fiber is moulded technique with the cover of sheath
Embodiment 2-8 is respectively the cover of a kind of plastic optical fiber sheath and moulds technique, and preparation method is identical with embodiment 1, and difference is only corresponding technical parameter difference in preparation process, and concrete data are in table 1.
Table 1 plastic optical fiber is moulded technical parameter table relevant in technique with the cover of sheath
It is short cool time that the cover of embodiment 2-8 is moulded in process sheath, good mechanical property, optical fiber attenuation coefficient increment≤10dm/km, the sheath peeling force of coating meets the requirement of tight sleeve layer fissility in industry standard YD/T1447～2012, and (tight sleeve layer should be easy to divest and be no less than 20mm from optical fiber, its peel force should be within the scope of 5～25N), environment serviceability temperature is-55～85 ℃, and optical fiber can use for a long time under hot environment.
vacuum pressure and the impact of core/mouth mould tolerance clearance on cable jacket performance in embodiment 9 oxygen barrier protective seam coating processes
Methyl methacrylate as the plastic optical fiber of base material in oxygen barrier protective seam coating process, vacuum pressure and core/mouth mould tolerance clearance have material impact to cable jacket performance, the vacuum environment of convenient pressure can reduce the radial pressure of melting sheath material to optical fiber, and the suitable tolerance clearance of core/mouth mould can make in connection with fibre coating process, there is suitable stretch ratio, in connection with fibre coating process, suitable radial pressure is combined the ratio of drawing that can reduce to overlap sheath in molded process with stretch ratio, reducing sheath traction type-approval process destroys the drawing-off of naked fibre, reduce optical fiber attenuation coefficient increment.The present embodiment is in oxygen barrier protective seam coating process; vacuum pressure and core/mouth mould tolerance clearance are explored; it is all identical with embodiment 1 that corresponding cover is moulded technique; difference is only; in each embodiment, corresponding vacuum pressure is different with core/mouth mould tolerance clearance, the concrete following table that the results are shown in.
The performance of sheath product for plastic optical fiber under the identical core/mouth of table 2 mould tolerance clearance, different vacuum pressure
As shown in Table 2, when core/mouth die clearance is 0mm, along with reducing of vacuum pressure, optical fiber attenuation coefficient increment increases gradually, sheath peeling force increases gradually, and in the time that vacuum pressure is-0.04～-0.02MPa, sheath peeling force meets the requirement of tight sleeve layer fissility in industry standard YD/T1447～2012, and (tight sleeve layer should be easy to divest and be no less than 20mm from optical fiber, its peel force should be within the scope of 5～25N), now optical fiber attenuation coefficient increment is larger.While showing 3-1,3-2,3-3 respectively to be respectively-0.02MPa of vacuum pressure ,-0.03MPa ,-0.04MPa, under different core/mouth mould tolerance clearances, plastic optical fiber is explored by the performance of sheath product, and concrete outcome sees the following form.
Table 3-1 vacuum pressure is-0.02MPa, different core/mouth mould tolerance clearance under the performance of plastic optical fiber use sheath product
Table 3-2 vacuum pressure is-0.03MPa, different core/mouth mould tolerance clearance under the performance of plastic optical fiber use sheath product
Table 3-3 vacuum pressure is-0.04MPa, different core/mouth mould tolerance clearance under the performance of plastic optical fiber use sheath product
From table 3-1, vacuum pressure is-when 0.02MPa, optical fiber attenuation coefficient increment and sheath peeling force are along with core/mouth mould tolerance clearance increases and reduces, in the time of optical fiber attenuation coefficient increment≤10 dB/km, optical fiber attenuation coefficient is little, but the now requirement of tight sleeve layer fissility in sheath peeling force no enough row industry standard YD/T1447～2012 (tight sleeve layer should be easy to divest and be no less than 20mm from optical fiber, its peel force should within the scope of 5～25N).
From table 3-2,3-3, when be respectively-0.03MPa of vacuum pressure ,-0.04 MPa, optical fiber attenuation coefficient increment and sheath peeling force are along with core/mouth mould tolerance clearance increases and reduces, in the time of optical fiber attenuation coefficient increment≤10 dB/km, optical fiber attenuation coefficient is little, when core/mouth mould tolerance clearance is 0.8～1.2mm, sheath peeling force meets the requirement (tight sleeve layer should be easy to divest and be no less than 20mm from optical fiber, its peel force should within the scope of 5～25N) of tight sleeve layer fissility in industry standard YD/T1447～2012.
As the above analysis; plastic optical fiber using methyl methacrylate as base material is in oxygen barrier protective seam coating process; vacuum pressure is-0.04～-0.03MPa; when core/mouth mould tolerance clearance is 0.8～1.2mm; optical fiber attenuation coefficient is little; attenuation coefficient increment≤10 dB/km, sheath peeling force meets the requirement (tight sleeve layer should be easy to divest and be no less than 20mm from optical fiber, its peel force should within the scope of 5～25N) of tight sleeve layer fissility in industry standard YD/T1447～2012.
Embodiment 1-8, it is only preferred embodiment of the present invention, be not the restriction of other form made for the present invention, any those skilled in the art may utilize above-mentioned technology contents to be changed or be modified as the equivalent embodiment of equivalent variations as enlightenment.In every case be the technical spirit that does not depart from the claims in the present invention, the simple modification that above embodiment has been done, equivalent variations and remodeling, still belong to the scope that the claims in the present invention are protected.
Claims (8)
1. plastic optical fiber is moulded a technique with the cover of sheath, adopts two-step approach to complete,
it is characterized in thatit carries out according to following preparation process:
The coating of I oxygen barrier protective seam
(1) unwrapping wire
Utilize actinobacillus device using the plastic optical fiber active unwrapping wire under the permanent tension force of 10～30N that adopts methyl methacrylate as base material, obtain A;
(2) preheating
A is through infrared preheating device, and preheating at 60～100 ℃, obtains B;
(3) vacuum coating
B enters in extrusion device, and sheath material is put into extrusion device hopper, under vacuum, high temperature, extrudes, and obtains C;
(4) cooling
C is introduced into 35～50 ℃ of hot water storgaes with traction and carries out coolingly, then enters 10～20 ℃ of cold rinse banks and carries out coolingly, obtains D;
(5) drafting forming
Dry up D surface moisture through blowing dryer, after caliper detection is qualified, enter draw-gear drafting forming, haulage speed is 30～60m/min, obtains E;
(6) take-up
E enters in the control device that tension force is 10～20N, is wound on spool through take-up, obtains the goods after the plastic optical fiber coating oxygen barrier protective seam using methyl methacrylate as base material, i.e. F;
The coating of II light shielding layer
(7) unwrapping wire
Utilize actinobacillus device by F active unwrapping wire under the permanent tension force of 20～30N, obtain G;
(8) preheating
G is through infrared preheating device, and preheating at 90～100 ℃, obtains H;
(9) vacuum coating
H enters in extrusion device, and sheath material is put into extrusion device hopper, under vacuum, high temperature, extrudes, and obtains I;
(10) cooling
I is introduced into 35～50 ℃ of hot water storgaes with traction and carries out coolingly, then enters 10～20 ℃ of cold rinse banks and carries out coolingly, obtains J;
(11) drafting forming
Dry up J surface moisture through blowing dryer, after caliper detection is qualified, enter draw-gear drafting forming, haulage speed is 30～60m/min, obtains K;
(12) take-up
K enters in the control device that tension force is 10～20 N, is wound on spool through take-up, obtains plastic optical fiber product.
2. plastic optical fiber according to claim 1 is moulded technique with the cover of sheath,
it is characterized in thatextrusion temperature described in step (3) is: 175～185 ℃, a district, 185～200 ℃, 2nd district, 195～215 ℃, 3rd district, 200～220 ℃, machine neck, 190～205 ℃, head one district, 190～200 ℃, head 2nd district.
3. optical cable according to claim 1 is moulded technique with the cover of sheath,
it is characterized in thatextrusion temperature described in step (9) is: 175～185 ℃, a district, 190～210 ℃, 2nd district, 200～225 ℃, 3rd district, 210～220 ℃, machine neck, 200～215 ℃, head one district, 190～200 ℃, head 2nd district.
4. plastic optical fiber according to claim 1 is moulded technique with the cover of sheath,
it is characterized in that:described sheath material is thermoplastic, putting into before extrusion device hopper, at 60～100 ℃, dries 90～150min.
5. plastic optical fiber according to claim 1 is moulded technique with the cover of sheath,
it is characterized in that:the coating of oxygen barrier protective seam is of a size of φ 1.5mm, and light shielding layer coating is of a size of φ 2.2mm.
6. mould technique according to the plastic optical fiber described in claim 1～5 with the cover of sheath,
it is characterized in that:in step (3), vacuum pressure is-0.04～-0.03MPa, and core/mouth mould tolerance clearance is 0.8～1.2mm.
7. mould technique according to the plastic optical fiber described in claim 1～5 with the cover of sheath,
it is characterized in that:in step (9), vacuum pressure is-0.04～-0.03MPa, and core/mouth mould tolerance clearance is 0～0.5mm.
8. plastic optical fiber according to claim 6 is moulded technique with the cover of sheath,
it is characterized in that:in step (9), vacuum pressure is-0.04～-0.03MPa, and core/mouth mould tolerance clearance is 0～0.5mm.
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Application publication date: 20140618 |