WO2016179925A1

WO2016179925A1 - Low-smoke halogen-free flame-retardant low-friction butterfly-shaped access optical cable

Info

Publication number: WO2016179925A1
Application number: PCT/CN2015/088203
Authority: WO
Inventors: 尤徐; 周华; 陈小建
Original assignee: 江苏中天科技股份有限公司
Priority date: 2015-05-12
Filing date: 2015-08-27
Publication date: 2016-11-17
Also published as: CN204679691U

Abstract

A low-smoke halogen-free flame-retardant low-friction butterfly-shaped access optical cable, consisting of an outer sheath (1), a colored optical fiber (2), and reinforcement pieces (3). The reinforcement pieces (3) are disposed on two sides of the colored optical fiber (2). The colored optical fiber (2) and the reinforcement pieces (3) are encapsulated in the outer sheath (1). The outer sheath (1) is provided with a circular arc surface, such that the friction can be reduced during home-entry and indoor laying in engineering construction. One end of the outer sheath (1) is provided with an enhancement suspension wire (4). The optical cable has a small surface friction coefficient, is made from a halogen-free low-smoke non-toxic material, has excellent flame retardant property, is applicable to home-entry and indoor laying in FTTH engineering construction, saves construction time, and reduces home-entry cost.

Description

Low-smoke, halogen-free, flame-retardant, low-friction butterfly-shaped cable

Technical field

The utility model relates to a low-smoke halogen-free flame-retardant low-friction butterfly-shaped introduction optical cable, which relates to two butterfly-introducing optical cables with various structures and colors, which have excellent surface friction performance which is difficult to match with ordinary butterfly-shaped introduction optical cables, and uses special Reinforce the hanging wire to achieve almost no slippage between the sheath and the sheath, and the cable kinking does not occur during construction. While ensuring its excellent construction performance, it also takes into account the end face water blocking, which is a densely populated area at home and abroad. The preferred product for wiring.

Background technique

As people's production and life have an unprecedented demand for information consumption, fiber-optic communication technology has been widely used in various fields, and the cost of optical access has been declining. Copper cable prices and copper wire access to operation and maintenance costs have risen. Carrier networks are rapidly shifting to networks characterized by broadband. With the emergence of more and more high-bandwidth services, FTTH/FTTB (fiber-to-the-home, fiber-optic building) has become the first choice of many operators. With the deepening of informatization, there is a great demand for increasing the number of access cables.

The most common use in the construction of FTTH is the butterfly-shaped cable. Over the years, with its excellent construction separation performance and small size, it has become one of the most popular access cables for many telecom operators at home and abroad. In developing countries, butterfly-shaped cable is also becoming the focus of the last segment of the fiber access network.

In the process of household installation, with the increasing limitations of the construction environment and the improvement of construction efficiency, the traditional butterfly-introducing optical cable gradually exposes many defects in use, especially in the reconstruction project of the old city communication line. The butterfly-introducing cable cannot smoothly pass through underground/air pipelines with multiple light/cables. Previously, domestic suppliers developed small-sized low-friction indoor butterfly-introducing cables based on low-friction PE sheath materials. It can increase the pipe penetration rate to a certain extent and reduce the traction at one end. However, since the strength of PE material is much larger than LSZH (low smoke and halogen-free fuel), it is easy to be a highlight of the butterfly-shaped cable. Stripping The performance is lost, the separation force is increased from less than 10N to about 20N, and even tools are needed to ensure that the peeling direction is not caused by the excessive force value and the reinforcing member is exposed during the peeling. In addition, the PE material is made of The butterfly-shaped cable (even the material known as flame-retardant PE) cannot pass the single vertical burning test specified by IEC60332-1-2 (International Electrotechnical Commission). For indoor cable, the flame retardant performance is considered to be suitable. One of the important criteria for indoor use.

The low-friction performance of the butterfly-introduced cable can be verified by the sliding friction test of multiple direct contact surfaces between the same type of cable. A large number of material tests show that the utility model relates to various low-smoke, halogen-free, flame-retardant and low-friction butterfly shapes. The introduction of the optical cable can effectively reduce the direct contact surface friction coefficient between the plurality of butterfly-type introduction cables of the type to below 0.25, and the direct contact surface friction coefficient between the conventional butterfly-shaped introduction cables is as high as 0.4 or more.

In addition, the black system commonly used in outdoor overhead butterfly-shaped cable is also increasingly affecting the interior and exterior of urban housing. The outdoor low-smoke, halogen-free, low-friction butterfly-shaped cable introduced in the present invention does not affect the surface friction performance. Under the premise of low-smoke and halogen-free flame retardant properties, the design of gray and black is available for users to choose.

Summary of the invention

The utility model aims to provide a low-smoke and halogen-free flame-retardant low-friction butterfly-shaped introduction optical cable for the shortcomings of the above-mentioned ordinary butterfly-shaped introduction optical cable during construction and use, and can be made into an indoor and outdoor butterfly-shaped introduction optical cable, and In the premise of ensuring its low friction coefficient, flame retardant and other characteristics, it involves three colors (indoor white, outdoor gray/black). The access cable of the utility model has a very low friction coefficient, low smoke, no halogen, flame retardant and non-toxic. A series of structural and material advantages such as small amount of smoke when burning; and retaining the characteristics of easy-to-construction and stripping of traditional butterfly-introducing optical cables; by using special steel wires as suspension lines, it is possible to avoid kinking and hitting of optical cables during construction The coils, etc., cause the cable below the suspension wire to bend too much and break the fiber.

The low-smoke, halogen-free, flame-retardant, low-friction butterfly-shaped fiber-optic cable is realized by the following technical solutions:

Low-smoke, halogen-free, flame-retardant, low-friction butterfly-shaped drop cable is composed of outer sheath, colored fiber, and reinforcement The reinforcing fiber is disposed on both sides of the colored fiber, the colored fiber and the reinforcing member are encapsulated in the outer sheath, and the outer sheath is disposed in a long waist shape. The outer sheath is provided with a circular arc surface, which can reduce friction during home construction and indoor laying.

An enhanced suspension wire is arranged at one end of the outer sheath, which can be used as an outdoor low-smoke halogen-free flame-retardant low-friction butterfly-shaped introduction cable. The indoor low-smoke, halogen-free, flame-retardant, low-friction butterfly-shaped drop cable may not be provided with an enhanced suspension wire.

The outer sheath adopts a low friction type thermoplastic low-smoke halogen-free polyolefin flame-retardant sheath material.

The production method of low-smoke and halogen-free flame-retardant low-friction butterfly-shaped optical cable is as follows: (indoor type without lifting wire)

Install the reinforcing suspension wire (steel wire) on the special pay-off frame, set the tension of the take-up thread and pull it to the split die exit for use; put two cable reinforcements (which can be metal wire or non-metal FRP) on the pay-off line Installed on the frame, set the tension of the reinforcing member to take the wire, and pull it along the guide roller of the reinforcing member to the outlet of the splitting die for use; install the colored fiber on the fiber-optic pay-off frame as required, and set the tension of the fiber-distributing wire. Pull along the fiber optic payoff guide to the split die exit, and fix it for use; select the appropriate butterfly-shaped cable to assemble the cable; combine the enhanced suspension wire with the two reinforcements through the split die and pass through the oven. Pass through the mold and open the extruder for extrusion; slowly pull the cable sheath and wrap it around the wheeled traction device; pass the colored fiber through the split mold and oven to the core; open the oven to set the temperature; adjust the mold The position and extrusion size make the inner reinforcing core and the optical fiber of the cable can be evenly distributed, not eccentric, and the optical fiber tightness (requires peeling 20cm jacket on the 50cm length cable, without using any tools to pull out the fiber) The outer diameter of the cable meets the requirements (the indoor outer diameter requirement is 1.6*2.0±0.1mm, and the outdoor outer diameter requirement is 2.0*5.3±0.2mm); the optical cable that meets the process requirements is wound around the storage reel and pulled to the take-up line. The shelf is on the line.

Low-smoke, halogen-free, flame-retardant, low-friction butterfly-shaped cable is beneficial:

·The surface friction coefficient is small, which is very conducive to reducing the resistance when various pipes are introduced and laying, and improving the construction efficiency;

·The material is halogen-free, low-smoke, non-toxic, and has excellent flame retardant properties, and is suitable for various FTTH indoor access projects;

·Outdoor low-smoke and halogen-free flame-retardant low-friction butterfly-shaped fiber-optic cable can effectively prevent the cable and the suspension wire from kinking due to improper wire-laying method during construction, resulting in increased attenuation, increased insertion loss and even fiber breakage;

·Outdoor low-smoke, halogen-free, flame-retardant, low-friction butterfly-shaped cable is excellent in water-blocking performance and UV-resistance, making it ideal for outdoor access applications;

· Perfectly compatible with traditional butterfly-shaped cable quick connector, convenient and fast;

The utility model relates to two structures (indoor/outdoor) low-smoke halogen-free flame-retardant low-friction butterfly-shaped introduction optical cable, which has low friction performance and retains the traditional butterfly-shaped introduction cable, has simple structure, simple construction and stripping, and low The advantages of smoke-free halogen flame retardant, especially suitable for FTTH project construction, indoor installation, saving construction time and reducing household costs.

DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings:

Figure 1 is a schematic diagram of an outdoor low-smoke, halogen-free, flame-retardant, low-friction butterfly-shaped optical cable.

Figure 2 is a schematic diagram of an indoor low-smoke, halogen-free, flame-retardant, low-friction butterfly-shaped optical cable.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings, and the scope of protection of the present patent is not limited to the following.

Referring to Figures 1-2, the low-smoke, halogen-free, low-friction butterfly-shaped drop cable is composed of an outer sheath 1, a colored fiber 2, and a reinforcing member 3. The colored fiber 2 is provided with reinforcing members 3, colored fibers 2 and The reinforcing member 3 is enclosed in the outer sheath 1, and the outer sheath 1 is provided in a long waist shape. The outer sheath 1 is provided with a circular arc surface, which can reduce friction during home construction and indoor installation.

An reinforced suspension wire 4 is disposed at one end of the outer sheath 1 and can be used as an outdoor low-smoke halogen-free flame-retardant low-friction butterfly-shaped introduction cable. The indoor low-smoke halogen-free flame-retardant low-friction butterfly-shaped introduction cable may not be provided with the reinforcing suspension wire 4.

The outdoor low-smoke and halogen-free flame-retardant low-friction butterfly-shaped cable is composed of an outer sheath 1, a colored fiber 2, a reinforcing member 3 and a reinforcing hanging wire 4 (steel wire), and an indoor low-smoke halogen-free flame-retardant low-friction butterfly is introduced. The optical cable is composed of an outer sheath 1, a colored optical fiber 2, and a reinforcing member 3, and has no reinforcing suspension line as compared with the outdoor type.

The outer sheath 1 is made of a low-friction thermoplastic low-smoke halogen-free polyolefin flame-retardant sheath material.

The colored optical fiber 2 is 1 to 12 cores.

The low-smoke, halogen-free flame-retardant low-friction butterfly-shaped cable is introduced into the optical cable, and the direct contact surface friction coefficient between the plurality of optical cables is less than 0.25. Under this premise, the flame-retardant characteristic of the optical cable itself is ensured to meet the IEC (International Electrotechnical Standard) The required single vertical burning, burning low smoke density meets the IEC required smoke density. The low-smoke, halogen-free, low-friction butterfly-shaped fiber-optic cable described in the IEC provides three-color indoor/outdoor fiber optic cables including gray, black, and white under the premise of meeting low friction, flame retardant, and smoke density. .

The low-smoke, halogen-free flame-retardant low-friction butterfly-shaped introduction optical cable is used for an outdoor low-smoke, halogen-free, flame-retardant, low-friction butterfly-shaped optical fiber cable, and the reinforcing suspension wire is used for the purpose of tightly bonding with the sheath, and The end of the whole cable is blocked by water and meets the water penetration test of IEC requirements.

The low-smoke, halogen-free flame-retardant low-friction butterfly-shaped fiber-optic cable is introduced, whether indoor or outdoor, low-smoke The halogen-free flame-retardant low-friction butterfly-shaped cable structure can produce 1 to 12 core optical cables, and the overall cable size increases accordingly.

For the outdoor type low-smoke, halogen-free flame-retardant low-friction butterfly-shaped fiber-optic cable, the reinforcing wire 4 is made of steel wire, and the sheath-steel wire can be tightly bonded when the wire surface is extruded, and the traditional outdoor butterfly shape Compared with the introduction of the optical cable, the sliding between the reinforcing wire and the sheath cannot be slipped at all, which effectively avoids the kinking of the cable portion and the hanging wire portion caused by improper operation during the construction of the wire, thereby causing an increase in fiber loss and joint loss. Increased, serious even caused problems with fiber breakage.

For outdoor and indoor low-smoke and halogen-free flame-retardant low-friction butterfly-shaped cable, the reinforcing member 3 can generally be selected from metal type (steel wire). Generally, the reinforcing member is considered to be an optical cable (the outdoor type is for the cable part). In the harsh condition of the curved wiring environment, the tensile strength is high and cannot be broken, and the protection ability for the optical fiber is strong; when the non-metallic reinforcing member (FRP type) is selected, the softness of the optical cable when bending the wiring in a general environment is generally considered. High, good flexibility after bending.

For outdoor and indoor low-smoke and halogen-free flame-retardant low-friction butterfly-shaped cable, the colored fiber 2 can generally be 1 to 12 cores, and the corresponding overall cable size will also increase. For FTTH cabling, due to consideration In the case of many bending, it is generally used to bend insensitive single-mode fibers.

For outdoor and indoor low-smoke, halogen-free, flame-retardant, low-friction butterfly-shaped cable, the outer sheath 1 is a key project affecting the overall low-friction performance of the cable. A large number of experimental demonstrations show that the same jacket material changes the color of the surface friction coefficient. Significant changes will occur, and the surface friction properties of the jacket material and its flame retardant properties are difficult to guarantee at the same time. After nearly a year of research and development, gray, black and white three-color sheath materials have been developed and demonstrated through a large number of experiments.

The low-smoke halogen-free flame-retardant low-friction butterfly-shaped optical cable is produced as follows: (indoor type without reinforcing hanging wire)

Install the reinforcing suspension wire (steel wire) on the special pay-off frame, set the tension of the take-up thread and pull it to the split die exit for use; put two cable reinforcements (which can be metal wire or non-metal FRP) on the pay-off line Installed on the frame, set the tension of the reinforcing member to take the wire, and pull it along the guide roller of the reinforcing member to the outlet of the splitting die for use; install the colored fiber on the fiber-optic pay-off frame as required, and set the tension of the fiber-distributing wire. Pull along the fiber optic payoff guide to the split die exit, and fix it for use; select the appropriate butterfly-introduction cable mold to assemble; and extend the lifting wire, the two reinforcing members and the colored fiber through the split mold, and pass through the oven. Pass through the mold and open the extruder for extrusion; slowly pull the cable and wrap it around the wheeled traction device; open the oven to set the temperature; adjust the position of the mold sleeve and the size of the extrusion, so that the inner core of the cable can be distributed. Uniform, non-eccentric, optical fiber tightness (requires peeling 20cm jacket on 50cm length cable, no fiber can be pulled by any tool), the outer diameter of the cable meets the requirements (indoor type outer diameter requirement is 1.6*2.0±0.1mm) An outer diameter of claims outdoor 2.0 * 5.3 ± 0.2mm); to meet the technical requirements of the cable wound on the storage reel, and is pulled to close the upper bobbin spooler.

Instance

The method for manufacturing a low-smoke, halogen-free flame-retardant low-friction butterfly-shaped optical cable is described by taking a 1-core indoor low-smoke halogen-free flame-retardant low-friction butterfly-introducing optical cable as an example.

1. Install the cable reinforcement on the pay-off frame, adjust the tension of the wire to about 10N, pull it along the guide roller of the reinforcement, and fix it by the oven to the split die;

2. The colored fiber is mounted on the fiber optic pay-off frame, and the tension of the pay-off wire is detected and set to about 70 g, which is pulled out along the guide wheel of the fiber optic pay-off frame, and is passed through the oven to the split mold. Set to stand by;

3. Select the 1.6*2.0 size optical cable extrusion mold to install, open the first section of the hot water, set the hot water temperature to 20 °C, and the subsequent sink is normal temperature cold water;

4. Pass the reinforcing member and the optical fiber through the mold, open the extruder to carry out the extrusion sheath, and slowly pull the cable to the wheeled traction device;

5, open the oven, set the drying temperature of 200 ° C;

6. Adjust the position of the mold sleeve and the size of the extrusion, so that the inner reinforcing core and the optical fiber of the cable can be evenly distributed, without eccentricity, and the optical fiber tightness (requires the peeling of the 20cm sheath on the 50cm length cable, without using any tools. ), the outer diameter of the cable meets the requirements of 1.6 * 2.0 ± 0.1mm;

7. Pull the above-mentioned well-prepared optical cable to the take-up reel and take it up.

The utility model relates to a low-smoke halogen-free flame-retardant low-friction butterfly-shaped introduction optical cable belonging to the technical field of optical communication manufacturing, and is an introduction and wiring optical cable suitable for use in an optical fiber access network, and is suitable for outdoor overhead introduction, pipeline introduction and attachment. Wiring and other laying conditions; this type of cable has a small surface friction coefficient; the material is halogen-free, low-smoke, non-toxic, and excellent in flame retardant; outdoor low-smoke, halogen-free, flame-retardant, low-friction butterfly-shaped cable can effectively prevent construction during construction. Due to improper wire-laying method, the cable body and the suspension wire are kinked, the end face is blocked by water, and the UV is resistant; the utility model is perfectly compatible with the traditional butterfly-shaped cable quick connector, and the low-friction performance is maintained, and the traditional butterfly-shaped cable is retained, and the structure is simple. The advantages of simple opening and stripping, low-smoke and halogen-free flame retardant are particularly suitable for household and indoor laying in FTTH construction, saving construction time and reducing household costs.

Claims

The utility model relates to a low-smoke halogen-free butterfly flame-retardant low-friction type introduction optical cable, which is characterized in that: an outer sheath, a colored fiber and a reinforcing member are formed, and reinforcing members are arranged on both sides of the colored fiber, and the colored fiber and the reinforcing member are encapsulated in the outer sheath The outer sheath is provided with a circular arc surface to reduce friction during home construction and indoor laying.
The low-smoke, halogen-free flame-retardant low-friction butterfly-shaped drop cable according to claim 1, wherein an enhanced hanging wire is disposed at one end of the outer sheath.
The low-smoke, halogen-free, low-friction butterfly-shaped drop cable according to claim 1, wherein the outer sheath is provided in a long waist shape.
The low-smoke, halogen-free, low-friction butterfly-shaped drop cable according to claim 1, wherein the colored fiber is 1 to 12 cores.
The low-smoke, halogen-free flame-retardant low-friction butterfly-shaped drop cable according to claim 1, wherein the direct contact surface friction coefficient between the plurality of types of optical cables is less than 0.25, and the resistance of the optical cable itself is ensured under the premise. The single vertical burning, burning low smoke density that meets the IEC requirements meets the IEC requirements for smoke density.
The low-smoke, halogen-free flame-retardant low-friction butterfly-shaped introduction cable according to claim 1, characterized in that: in the condition of satisfying low friction, flame retardance and smoke density, there are three colors including gray, black and white. Indoor/outdoor fiber optic cable.
The low-smoke halogen-free flame-retardant low-friction butterfly-shaped introduction cable according to claim 1, characterized in that: for the outdoor type low-smoke halogen-free flame-retardant low-friction butterfly-shaped introduction optical cable, the reinforcing suspension wire is used to reach the sheath and the sheath. The purpose of tight bonding, and the overall cable end face is blocked by water, meeting the IEC requirements for water seepage test.
The low-smoke, halogen-free, low-friction butterfly-shaped drop cable according to claim 1, wherein the outer sheath is made of a low-friction thermoplastic low-smoke halogen-free polyolefin flame-retardant sheath material.