CN114942500A - Rat-proof belt for optical cable and preparation method thereof - Google Patents
Rat-proof belt for optical cable and preparation method thereof Download PDFInfo
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- CN114942500A CN114942500A CN202210876810.8A CN202210876810A CN114942500A CN 114942500 A CN114942500 A CN 114942500A CN 202210876810 A CN202210876810 A CN 202210876810A CN 114942500 A CN114942500 A CN 114942500A
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- layer
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- ratproof
- rat
- proof
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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
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
- A01M29/00—Scaring or repelling devices, e.g. bird-scaring apparatus
- A01M29/12—Scaring or repelling devices, e.g. bird-scaring apparatus using odoriferous substances, e.g. aromas, pheromones or chemical agents
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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
Abstract
The invention discloses a ratproof belt for an optical cable and a preparation method thereof, wherein the ratproof belt for the optical cable comprises a base belt layer, a first flannelette layer, a physical ratproof layer, a second flannelette layer and a covering layer, wherein the physical ratproof layer adopts glass fiber, a chemical ratproof object is arranged on the physical ratproof layer, and the chemical ratproof object comprises bitter principle powder, pungent principle powder and water-blocking powder; the optical cable is sealed with the edge of the ratproof belt. The preparation method comprises the following steps: 1) stirring the bitter gourmet powder, the pungent gourmet powder and the water-blocking powder uniformly; 2) forming a first pile pad on the base belt layer; 3) carding the glass fibers into strips; 4) spraying a chemical rat-proof substance on the glass fiber; 5) forming a second velvet layer on the surfaces of the chemical rat-proof substance and the glass fibers; 6) forming a covering layer on the second velvet layer; 7) and (7) sealing and sealing. Before the rat-proof belt for the optical cable is applied to the optical cable, the bitter principle powder and the spicy principle powder are sealed in the cavity, and hands do not feel uncomfortable when contacting the surface of the rat-proof belt for the optical cable.
Description
Technical Field
The invention belongs to the field of optical cables, and particularly relates to a ratproof belt for an optical cable and a preparation method thereof.
Background
The rat prevention of the optical cable is a worldwide problem and mainly aims at reasonably balancing the rat prevention timeliness and the economy. The existing ratproof basic method mainly comprises two main categories of physical ratproof and chemical ratproof; the physical rat-proof is divided into a metal reinforced rat-proof type and a nonmetal reinforced rat-proof type, the metal reinforced rat-proof is generally armored by adopting steel wires or high-hardness steel, the optical cable is heavy and is not easy to bend and coil, and lightning strike is caused by the fact that the rat bites the exposed metal substance, so that the optical cable is very unsafe and is generally applied to the optical cable with a central tube structure with the diameter; the nonmetal reinforced rat proofing has two main modes, firstly, the rat proofing is carried out by winding glass fiber yarns with the thickness of at least more than 1mm on the surface of the cable core or the inner sheath of the optical cable, so that the requirements can be met only by winding a plurality of glass fibers and equipment; secondly, a layer of FRP round rod with the diameter of more than 1mm or a layer of FRP flat bar with the thickness of 1mm is stranded outside the cable core or the inner sheath, the purpose of rat prevention is achieved through the hardness of the FRP round rod or the FRP flat bar, the purpose of rat prevention is achieved by special and numerous devices, the cost of the optical cable is huge, and the optical cable is very difficult to strip and coil in the construction process due to the huge rigidity of the FRP round rod and the FRP flat bar in the optical cable.
Through experimental video observation and optical cable structural analysis of a large number of rodent gnawing optical cables, the rodent gnawing directions are all along the cross section direction of the optical cable when gnawing the optical cable, and the rodents scrape from the outer wall to the inside little by little. The winding direction of the optical cable adopted for the non-metal physical protection of the optical cable is along the axial direction of the optical cable, and when a mouse bites the optical cable, the mouse is ground to be broken, brittle and powder in the middle of the protective layer. All glass fiber yarns have the single yarn diameter below 8 micrometers, some glass fiber yarns have less than 3 micrometers and almost no rigidity in the production process based on the weaving or winding function, and the glass fiber yarns are used as a protective layer of an optical cable, almost all glass fiber yarns are wrapped with a sheath material in the process of being bitten by a mouse, so that the influence on the puncture of the oral cavity of the mouse is very small, the mouse-proof effect is not obvious, and a large number of protective layers are required to be added to achieve the limited mouse-proof effect. For the FRP round rod and the flat FRP strip as the protective layers, because the adhesive force between the protective layer and the protective layer material is not strong, the force of the protective layer material falling along the axial direction is relatively easy in the process of being bitten by a mouse, a section of exposed protective layer is possible to appear, and the exposed parts can be continuously enlarged along with the time. These protective layers are brittle and fail to protect against light or self-twisting stresses.
The chemical rat-proof method is mainly characterized in that the piquancin is added into a sheath of the optical cable for rat-proof, the melting point of the piquancin is about 50-60 ℃, the boiling point is about 200 ℃, the temperature of the optical cable during granulation or extrusion is as high as 220 ℃, the rat-proof optical cable is produced in such a way, strong pungent smell can be diffused in a workshop, the respiratory health of a human body is seriously affected, meanwhile, the wall thickness of the sheath achieves the rat-proof effect, the added piquancin is more than that of the sheath by weight, the cost is very high, meanwhile, the piquancin is dispersed in the surface of the sheath, and the problem that an optical cable take-up person or constructor inevitably contacts the sheath directly by hands sometimes, the skin is easily red and swollen and the like is solved.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides the ratproof belt for the optical cable and the preparation method thereof, and the ratproof belt has good ratproof performance, and is safe and reliable.
In order to achieve the above object, according to one aspect of the present invention, there is provided a ratproof belt for an optical cable, comprising a base belt layer, a first wool layer, a physical ratproof layer, a second wool layer and a covering layer, which are sequentially arranged from bottom to top, wherein the physical ratproof layer is made of glass fiber, and a chemical ratproof substance is provided on the physical ratproof layer, and comprises bitter principle powder, capsaicin powder and water-blocking powder;
the two edges of the rat-proof belt in the width direction for the optical cable are sealed in a sealing mode.
Preferably, each glass fiber has a diameter of 10 um to 125um, a length of more than 3mm, and not more than 90% of the width of the ratproof belt for optical cables.
Preferably, an included angle between the length direction of 80% or more of the glass fibers and the width direction of the rat-proof belt for the optical cable is distributed in an interval of [ -10 °, 10 ° ], wherein the included angle of 0 ° means that the length direction of the glass fibers is consistent with the width direction of the rat-proof belt for the optical cable.
Preferably, the diameter of the water-blocking powder is greater than 100um, and the pungent taste ingredient powder is packaged in a capsule.
Preferably, the first flock layer is a flock spraying layer and/or a flocking layer, and the second flock layer is a flock spraying layer or a flocking layer.
Preferably, the first velvet layer and the second velvet layer are both prepared from maleic anhydride grafted polypropylene compositions.
Preferably, the base belt layer is made of polyester tape.
Preferably, the covering layer is a polymer material film.
Preferably, the edge of the rat guard for the optical cable is sealed by a hot-press sealing.
According to another aspect of the present invention, there is also provided a method for preparing the ratproof tape for optical cables, comprising the steps of:
1) uniformly stirring the bitter principle powder, the capsaicin powder and the water-blocking powder according to a set proportion;
2) forming a first pile pad on the base belt layer;
3) carding the glass fiber into strips after primary opening and fine opening in sequence;
4) uniformly spraying the mixed chemical rat-proof substance on the glass fiber;
5) forming a second velvet layer on the surfaces of the chemical rat-proof object and the glass fiber;
6) forming a covering layer on the second velvet layer;
7) and sealing the base band layer, the first flannelette cushion, the second flannelette layer and the covering layer according to a set width to connect the base band layer, the first flannelette cushion, the second flannelette layer and the covering layer together, baking and shaping, ironing to a set thickness, finally cutting to a set width and then coiling, and ensuring that the edge of the rat-proof band for the optical cable is still sealed in a sealing manner during cutting.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1) before the ratproof belt for the optical cable is applied to the optical cable, the bitter principle powder and the capsaicine powder are sealed in the cavity between the first velvet layer and the second velvet layer, hands do not feel uncomfortable when being in contact with the surface of the ratproof belt for the optical cable, and the ratproof belt for the optical cable is very safe. And after the optical cable is applied to the optical cable, in the rat-proof process, after the rat-proof belt is scratched and damaged by rats, the rat-proof belt is exposed to the air when meeting water or for a long time, the water-blocking powder can swell, the bitter principle powder and the pungent principle powder can slowly overflow out of the damaged part along with the swelled substances, the taste of the material at the damaged part is changed, the purpose of repelling rats is achieved, and the damaged opening can be sealed. The smell of the chemical rat-proof object far away from the damaged part in the closed cavity can slowly move to the damaged part along the velvet layer, so that the timeliness of the rat-proof effect can be ensured.
2) The glass fiber is 10-125 um and is longer than 3mm, the diameter of the glass fiber is larger, the short glass fiber is adopted, the rigidity is increased, the mouth cavity of a rat can be punctured easily, the glass fiber with the increased rigidity and the scraped sheath scraps are not easy to wrap together, and the mouth cavity of the rat is punctured objectively more easily.
3) After the ratproof belt is applied to the optical cable in a longitudinal wrapping mode, the length direction of most of glass fibers is changed from the conventional direction along the axial direction of the optical cable to the transverse direction, so that when the optical cable is scraped by the teeth of a mouse, the glass fibers are easier to prick into the oral cavity of the mouse.
4) The ratproof belt is soft, does not influence the construction plate of the optical cable, has small thickness, relatively improves the concentration of chemical ratproof substances, and has low cost and good economic benefit.
Drawings
Fig. 1 is a schematic structural view of the ratproof tape for optical cables of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, a rat guard for optical cable, which is generally rectangular parallelepiped in shape as a whole, is used for being longitudinally wrapped in an optical cable, for example, an inner sheath for longitudinally wrapping an optical cable, includes a base tape layer 1, a first flocked layer 2, a physical rat guard 3, a second flocked layer 5 and a covering layer 6, which are sequentially arranged from bottom to top, wherein the physical rat guard 3 is made of glass fiber, the first flocked layer 2 is a sprayed-on layer and/or a flocked layer, the second flocked layer 5 is a sprayed-on layer or a flocked layer, the first flocked layer 2 and the second flocked layer 5 can function to bond the base tape layer 1 on the lower layer and the covering layer 6 on the upper layer of the rat guard, and can well fix the glass fiber, and the glass fiber is paved between the two flocked layers and is not easily displaced. The physical rat-proof layer 3 is provided with a chemical rat-proof object 4, and the chemical rat-proof object 4 comprises bitter principle powder, pungent principle powder and water-blocking powder; the bitter gourmet powder and the capsaicin powder are both chemically synthesized, and the capsaicin powder adopts a nanometer grade. The nano-scale pungent monosodium glutamate powder has the advantages that the pungent monosodium glutamate powder can be prepared into capsules, the diameter of the capsules is not more than 100 micrometers, the capsules, the water blocking powder and the bitter monosodium glutamate powder are sprayed on the surfaces and gaps of the rat-proof glass fibers together, basically, the capsules cannot be broken, the generated odor is small, meanwhile, the pungent monosodium glutamate powder, the bitter monosodium glutamate powder and the water blocking powder are easy to mix uniformly, and automatic and uniform spraying on the surfaces and gaps of the rat-proof glass fiber yarns is easy to realize.
The more the chemical rat-proof substance 4 of the optical cable, the theoretically placed mass of the pungent taste substance and the bitter taste substance is, the better the rat-proof effect is, but considering the balance of the product cost and the effectiveness and effectiveness of the rat-proof, the mass element of the chemical rat-proof substance 4 per square centimeter, the bitter taste substance powder is not less than 0.05mg/cm, the pungent taste substance powder is not less than 0.05mg/cm, the water-blocking powder is not less than 0.25 mg/cm.
According to the parts by mass, bitter principle powder is preferably selected: capsaicin powder: water-blocking powder = 1: 1: 5, the advantage of the design has the processing manufacturing and can realize the automatic proportion feed, reduce the artificial participation degree, guarantee simultaneously that the overburden 6 of protection against rodents area even after being bitten through the very little hole by the rodent, the powder that blocks water has enough ability to absorb water or absorb moisture inflation, makes peppery gourmet powder and bitter gourmet powder spill over the surface, prevents the rodent from invading continuously.
If the whole optical cable rat-proofing tape product is approximately in a rectangular parallelepiped shape, the whole of the base tape layer 1, the first flocked layer 2, the second flocked layer 5 and the covering layer 6 is also approximately in a rectangular parallelepiped shape, and the width direction of the optical cable rat-proofing tape is also the width direction of the base tape layer 1.
The two edges of the optical cable in the width direction are sealed in a sealing mode through the rat-proof belt, and therefore the odor of the chemical rat-proof object 4 is effectively prevented from overflowing. The hermetic seal is preferably achieved by hot pressing. The base band layer 1, the first velvet layer 2, the second velvet layer 5 and the covering layer 6 are tightly connected together through the sealing seal, so that the glass fibers and the chemical rat-proof substances 4 are all left in the sealed cavity between the first velvet layer 2 and the second velvet layer 5. Of course, other ways of achieving a sealed closure are also possible, such as gluing, etc.
Further, every glass fiber's diameter is 10 um ~125um, and length is greater than 3mm, and is not more than the 90% of the width of protection against rodents area for the optical cable. The glass fiber has larger diameter, and the short glass fiber is adopted, so that the rigidity is enhanced, the mouth cavity of the mouse can be easily punctured, and a good mouse-proof effect is achieved.
Further, even if the primary comb and the combing comb exist in the process of manufacturing the belt, in the process of edge rolling and edge sealing of the belt width, the short fibers can be subjected to angle dislocation. More than 80% of included angles between the length direction of the glass fiber and the width direction of the rat-proof belt for the optical cable are distributed in an interval of [ -10 degrees, 10 degrees ], wherein the included angle is 0 degree, which means that the length direction of the glass fiber is consistent with the width direction of the rat-proof belt for the optical cable. After the rat guard is wrapped on other structures of the optical cable, most of the glass fibers do not extend along the axial direction of the optical cable but extend along the transverse direction of the optical cable, and the glass fibers at the damaged parts can prick the mouth of a rat as much as possible after the rat bites the optical cable.
Furthermore, the diameter of the water-blocking powder is not more than 100 microns, the pungent monosodium glutamate powder is filled in the capsule, the capsule is in a basically complete state at normal temperature, but due to the fact that the melting point (about 58 ℃) and the boiling point of the pungent monosodium glutamate are lower (about 200 ℃), the capsule can be broken by heating in the processes of forming, baking, thickness shaping and optical cable processing of the second velvet layer 5 in the production process of the rat-proof belt, at the moment, the pungent monosodium glutamate and other chemical rat-proof objects 4 are sealed in the rat-proof belt, the completeness and breakage of the capsule before and after the process of the rat-proof belt are just the effects which need to be achieved, the main purpose is that the adverse effects on people before breakage are small, and the capsule can form the rat-proof effect with the bitter monosodium glutamate and the glass fibers after breakage.
Further, the first velvet layer 2 and the second velvet layer 5 are both prepared from maleic anhydride grafted polypropylene compositions. The maleic anhydride grafted polypropylene composition is a mixture of polypropylene and maleic anhydride graft, and the mass fraction of the maleic anhydride graft in the maleic anhydride grafted polypropylene composition is preferably 3%.
Furthermore, the base belt layer 1 is made of polyester tapes, the thickness of the base belt layer 1 is preferably 0.05 mm-0.1 mm, and the base belt layer mainly has the functions of temperature resistance and tensile strength. The thickness of the first velvet layer 2 is 0.01mm-0.05mm, the thickness of the second velvet layer 5 is 0.01mm-0.05mm, the thickness of the physical rat-proof object is 0.05mm-0.3mm, the thickness of the covering layer 6 is 0.05 mm-0.1 mm, the whole thickness of the optical cable rat-proof belt is 0.2mm-0.7mm, the flock spraying or flocking layer mainly plays a role in adhering upper and lower layers and fixing glass short fibers, the arrangement is not too thick, the arrangement is generally matched with the thickness of the used glass fibers, and when the thickness of the glass fibers is increased, the thicknesses of the flock spraying layer base band and the covering layer 6 are increased correspondingly. The thickness of the physical protective layer is directly related to the rat-proof performance, the thickness is adjusted according to the rat-proof capacity in a grading way, and the thickness is preferably not more than 0.3mm in consideration of the requirement of the later-stage optical cable wrapping process. The choice of the thickness of the ratproof strip is related to the choice of the rigidity of the physical ratproof layer 3, ensuring that the ratproof glass fibre strip does not penetrate the cover layer 6 when the ratproof strip is wrapped in a transverse bend.
Further, the covering layer 6 is a high polymer material film, preferably a polyethylene film, which is equivalent to a covering cloth covering the second pile layer 5, and plays a role in covering and protecting.
Through selecting above material and thickness for the protection against rodents area is very soft for the optical cable, does not influence the construction dish of optical cable and stays. And the thickness of the ratproof belt is small, the concentration of the chemical ratproof object 4 is relatively high, and the cost of the short glass fiber is low, so that the overall cost of the ratproof belt for the optical cable is also reduced.
According to another aspect of the invention, the preparation method of the ratproof belt for the optical cable is also provided, and comprises the following steps:
1) uniformly stirring the bitter principle powder, the capsaicin powder and the water-blocking powder according to a set proportion to form a chemical rat-proof substance 4; the capsaicine powder can be filled into capsules, and the capsules are uniformly mixed with the bitter principle powder and the water-blocking powder.
2) A first pile pad is formed on the base tape layer 1, and the first pile pad can be formed by a pile spraying process.
3) Carding the glass fiber into strips after primary opening and fine opening in sequence; the damage problem of the glass fiber needs to be noticed in the opening process, because the mechanical action in the opening process easily causes the breakage of the glass fiber, the process needs to be reasonably configured in the opening process, and the damage of the glass fiber is reduced as much as possible on the basis of realizing the full opening of the raw materials. During carding, most of the glass fibers are made to be approximately consistent with the width direction of the ratproof belt, and the glass fibers are carded into strips.
4) The mixed chemical rat-proof substance 4 is uniformly sprinkled on the glass fiber.
5) The second velvet layer 5 formed on the surface of the chemical rat-proof object 4 is preferably formed by a velvet spraying process; the second velvet layer 5 is formed by spraying velvet, and then the covering layer 6 is formed on the second velvet layer 5, so that the second velvet layer 5 formed by spraying velvet can fix the direction of the glass fiber after carding in time, the large deflection of the angle of the glass fiber can be ensured, the second velvet layer 5 formed by spraying and melting can easily break the pungent taste element containing capsules to form the chemical rat-proof object 4, the second velvet layer is liquid when spraying, can easily penetrate into the first velvet layer 2 in a small amount and is combined with the first velvet layer 2, and the covering layer 6 applied in the later period is added, so that the whole rat-proof belt is bonded into a relatively fixed rat-proof belt up and down, and the glass fiber of the physical protective layer can not loose and misplace when being cut and wound in the later period. If the second velvet layer 5 is pre-formed on the covering layer 6, the covering layer 6 and the second velvet layer 5 are difficult to be combined with the bottom layers (the chemical rat-proof object 4, the physical rat-proof layer 3, the first velvet layer 2 and the base belt layer 1) below the covering layer 6 and the second velvet layer 5 into a whole in the later period, and the physical protective layer is in a loose state.
6) A cover layer 6 is moulded onto the second pile layer 5.
7) The base band layer, the first flannelette cushion, the second flannelette layer and the cover layer are sealed and connected together according to the set width (the sealing and sealing are that the base band layer 1, the first flannelette layer 2, the second flannelette layer 5 and the cover layer 6 are connected together through a sealing and sealing process, so that the physical rat-proof layer 3 and the chemical rat-proof object 4 are left between the first flannelette layer 2 and the second flannelette layer 5. The prepared ratproof belt is very long, the ratproof belt with the set length can be cut at any time in use and used in optical cable production, sealing can be carried out only in the width direction according to the set width, the two ends in the length direction can not be sealed, the sealing can be carried out by using an adhesive tape during storage), then baking and shaping are carried out, the ratproof belt is ironed to the set thickness, finally, the ratproof belt is cut to the set width and then coiled, and the edge of the ratproof belt for the optical cable is still sealed in a sealing mode during cutting.
It will be understood by those skilled in the art that the foregoing is only an exemplary embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, since various modifications, substitutions and improvements within the spirit and scope of the invention are possible and within the scope of the appended claims.
Claims (10)
1. The rat-proof belt for the optical cable is characterized by comprising a base belt layer, a first velvet layer, a physical rat-proof layer, a second velvet layer and a covering layer which are sequentially arranged from bottom to top, wherein the physical rat-proof layer is made of glass fibers, a chemical rat-proof object is arranged on the physical rat-proof layer, and the chemical rat-proof object comprises bitter principle powder, pungent principle powder and water-blocking powder;
the two edges of the rat-proof belt in the width direction for the optical cable are sealed in a sealing mode.
2. The ratproof belt for optical cables according to claim 1, wherein each of the glass fibers has a diameter of 10 um to 125um, a length of more than 3mm, and not more than 90% of the width of the ratproof belt for optical cables.
3. The ratproof belt for optical cables according to claim 1, wherein an angle between 80% or more of the length direction of the glass fiber and the width direction of the ratproof belt for optical cables is distributed in an interval of [ -10 °, 10 ° ], wherein an angle of 0 ° means that the length direction of the glass fiber is identical to the width direction of the ratproof belt for optical cables.
4. The ratproof belt for optical cables as claimed in claim 1, wherein the diameter of the water-blocking powder is greater than 100um, and the capsaicine powder is contained in a capsule.
5. The ratproof belt for optical cables as claimed in claim 1, wherein the first flocked layer is a flocked layer and/or a flocked layer, and the second flocked layer is a flocked layer or a flocked layer.
6. The ratproof belt for optical cables as claimed in claim 1, wherein the first and second nap layers are both made of maleic anhydride grafted polypropylene composition.
7. A ratproof tape for optical fiber cables as claimed in claim 1, wherein the base tape layer is a polyester tape.
8. The ratproof belt for optical cables as claimed in claim 1, wherein the covering layer is a polymer film.
9. The ratproof belt for optical cables according to claim 1, wherein the edges of the ratproof belt for optical cables are sealed by a heat sealing.
10. The method for preparing a ratproof tape for an optical cable according to any one of claims 1 to 9, comprising the steps of:
1) uniformly stirring the bitter principle powder, the capsaicin powder and the water-blocking powder according to a set proportion;
2) forming a first pile pad on the base belt layer;
3) the glass fiber is carded into strips after being subjected to primary opening and fine opening in sequence;
4) uniformly spraying the mixed chemical rat-proof substance on the glass fiber;
5) forming a second velvet layer on the surfaces of the chemical rat-proof object and the glass fiber;
6) forming a covering layer on the second velvet layer;
7) and sealing the base band layer, the first flannelette cushion, the second flannelette layer and the covering layer according to a set width to connect the base band layer, the first flannelette cushion, the second flannelette layer and the covering layer together, baking and shaping, ironing to a set thickness, finally cutting to a set width and then coiling, and ensuring that the edge of the rat-proof band for the optical cable is still sealed in a sealing manner during cutting.
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| CN114942500B CN114942500B (en) | 2022-11-29 |
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| CN114942500B (en) | 2022-11-29 |
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