WO2018045972A1

WO2018045972A1 - Plastic optical fiber, preparation method therefor and preparation device thereof

Info

Publication number: WO2018045972A1
Application number: PCT/CN2017/100771
Authority: WO
Inventors: 陈明; 胡卫明; 葛玉祥
Original assignee: 深圳市圣诺光电科技有限公司
Priority date: 2016-09-06
Filing date: 2017-09-06
Publication date: 2018-03-15
Also published as: CN106182666B; CN106182666A

Abstract

A plastic optical fiber, a preparation method therefor and a preparation device thereof. The preparation method includes the following steps: coordinating the fluidity of a fluororesin raw material and the fluidity of a PMMA raw material, and jointly matching and extruding the fluororesin raw material and the PMMA raw material in a multi-core coextrusion die (310). Producing a plastic optical fiber by using a multi-core co-extrusion method can help solve the problems of fluidity mismatching and air setting of an optical fiber cladding layer fluororesin raw material, improve the stability of the quality of optical fiber production, and achieve effects such as a more cladding layer uniform thickness, better optical fiber toughness and reduced optical fiber attenuation.

Description

Plastic optical fiber, preparation method and preparation device thereof

Technical field

The present application relates to the field of optical fibers, and in particular, to a method for preparing a plastic optical fiber, a plastic optical fiber prepared by using the preparation method, and a device for preparing a plastic optical fiber.

Background technique

Although the development history of optical fiber communication is only two or three decades, due to its unparalleled superior performance, with the rapid development of optical communication industry, it has become the most important transmission medium in modern communication networks, building a modern social information highway. And go deep into life and work today and tomorrow. It can be summed up in the simplest sentence: there is no network without fiber, no data communication, and there is no modern technology. Therefore, modern life is inseparable from network and communication.

Optical fiber is a shorthand for optical fiber, which consists of a core and a cladding. According to different fiber core materials, it can be divided into quartz (glass) fiber and plastic fiber. Quartz fiber is a tool that uses light to achieve light transmission through the principle of total reflection in fibers made of glass. The fiber core is generally tens of micrometers or a few micrometers, which is thinner than a hairline; the outer layer of the fiber is called a cladding layer, and the function of the cladding layer is to function as a total reflection to ensure that the light wave is continuously reflected in the optical fiber and transmitted. To achieve the purpose of communication. Since glass material is the main material for making optical fibers, it is an electrical insulator, so there is no need to worry about grounding protection. Light waves are transmitted in the optical fiber, and information leakage in information propagation does not occur. Since the quartz fiber core is very thin, the connection requirements are strict, and only professional personnel can connect; and the fiber core is made of glass, which is very fragile and has poor anti-vibration performance, and the application industry and the scene are limited. Therefore, it is a general trend for plastic optical fibers to replace quartz fibers in these restricted industries and scenarios.

An optical fiber whose optical fiber core is made of plastic fiber is called a plastic optical fiber. One of the most commonly used plastic optical fibers for communication is PMMA communication plastic optical fiber. It has become a new type of network transmission medium. Because plastic fiber is light, soft, vibration resistant and flexible, and has excellent tensile strength, Durability and large diameter of the fiber core (compared to the glass fiber core) make it easy to connect light to devices, light sources, detectors, etc., and non-professionals can handle these operations.

PMMA communication plastic optical fiber is an important research and application field of short-distance communication. At the beginning of this century, China has carried out many research work on plastic optical fiber, such as communication distance problem, communication network reliability problem, communication network security problem, network. Transmission rate and industrial production issues. The PMMA plastic optical fiber is mainly composed of two parts: the central part is a fiber core (Core); the outer part is a fiber cladding (Clad).

According to the standard of YD/T 1447-2013 Plastic Optical Fiber for Communication, the plastic optical fiber with a diameter of 1mm has a core diameter of 975um±10um and a cladding diameter of 1mm.

The main parameters of the commonly used 1mm diameter plastic fiber are as follows:

芯材料Core material	PMMAPMMA	PMMA折射率PMMA refractive index	1.4921.492
包层材料Cladding material	氟树脂Fluororesin	氟树脂折射率Fluororesin refractive index	1.406/1.411/1.461.406/1.411/1.46
数值孔径NANumerical aperture NA	0.50/0.485/0.30.50/0.485/0.3	最小弯曲半径Minimum bending radius	≤30mm≤30mm

The attenuation value of PMMA communication plastic optical fiber is generally expected to be ≤200dB/km. The data transmission rate can reach 100Mb/s×100m or more.

During the transmission of PMMA plastic optical fiber, light passes through the core material and is continuously reflected and advanced to the receiving end at the interface between the core material and the cladding material. Light from the source enters the core portion of the plastic fiber through the fiber end face and is totally reflected at the junction of the core and the cladding until the other end of the fiber. Since the light transmittance of the core material is generally only 92% to 93%, the material has a loss of light, so the transmission distance of the PMMA plastic optical fiber generally does not exceed 100 m.

The plastic optical fiber not only has the optical transmission characteristics of the quartz optical fiber, but also has a series of advantages such as light and soft, flexural resistance, high impact strength, low price, anti-irradiation, easy processing, and large diameter. It is very popular. Among them, the large diameter is usually 1 to 3 mm to increase the light receiving angle and expand the range of use. In addition, the diameter of the plastic optical fiber core is about 1 mm, which is about 100 times larger than that of the quartz optical fiber core, and the connection between the optical fibers and the personal terminal. The connection of the device is very easy. Plastic light The fiber installation cost is very low, and it is very convenient to install with a very simple alignment plug. Plastic optical fiber can be widely used in communication, control, network, lighting, and the need for anti-interference, anti-static, anti-magnetic, fire, lightning and other specific places.

Because plastic optical fiber has the advantages of light weight, good toughness, easy interface, low comprehensive cost and low light source, it has been widely recognized by the industry, which makes it one of the application technologies in broadband access networks.

As an ideal transmission medium for short-distance communication networks, plastic optical fiber will be home intelligent, office automation and industrial control network in the future. It has an important position in data transmission in on-board communication networks, military communication networks and multimedia devices.

Through plastic optical fiber, it can realize the networking of smart home, achieve home automation and remote control management, and improve the quality of life; for example, smart home includes home PC, HDTV, telephone, digital imaging equipment, home security equipment, air conditioner, refrigerator, sound system Kitchen appliances, etc.; through the plastic optical fiber, the networking of office equipment can be realized, the data between office equipment can be transmitted at high speed, and the information can be kept secret.

When the LAN speed is less than 100M, the transmission within 100 meters can be realized with PMMA plastic optical fiber; the transmission within 150M 50m can be realized by PMMA plastic optical fiber with small numerical aperture.

The standards of the plastic optical fiber industry at home and abroad are divided into two grade parameter values for the attenuation of the communication plastic fiber, which are ≤180dB/km and ≤300dB/km. The industry's tacit understanding has formed a consensus that only plastic optical fibers with attenuation less than 200dB/km can be used in the field of communications. At present, only foreign countries can industrially produce communication plastic optical fibers with attenuation values ≤180dB/km. There are several specialized plastic optical fiber manufacturers in China, which have industrialized production capacity, and can also produce communication plastic optical fibers with attenuation less than 200dB/km, but the quality is still unstable; the communication plastic optical fiber with attenuation value ≤180dB/km is still Can not be produced, can not meet the domestic customer demand for high-end communication performance.

The prior art is a trial production of a plastic optical fiber production line using a single-core extrusion die. This kind of life The production method is to produce only one plastic optical fiber per production line. Its characteristics are simple and easy to operate, the power requirements of the equipment are small, the production process control is relatively easy, and the production mold is relatively easy to manufacture. After trial and error, although plastic optical fibers can be produced, it is difficult to achieve high performance requirements. It is still difficult to produce plastic optical fibers with attenuation less than 200 dB/km, and the quality is unstable. The wire drawing process used is by setting the indoor ambient temperature. The products produced by this production method and process method are difficult to meet the communication application requirements of high-end customers. This method can be called a single core coextrusion method. In addition, another performance index of plastic optical fiber - numerical aperture (NA) value, has specific requirements in the standard. This parameter is a function of the refractive index of the cladding material of the fiber and the refractive index of the core material. In order to ensure that the produced plastic optical fiber meets the requirements of the optical fiber standard, when selecting the core material and the cladding material, it is necessary to pay attention to the refractive index matching of the two raw materials to ensure that the NA value of the produced plastic optical fiber meets the standard requirements.

The single-core coextrusion method is a production method using a single-core co-extrusion technique and an air-setting technique. After repeated trial production, it is found that there will be some problems in the single-core production method, which must be solved.

Since the outer side of the PMMA plastic optical fiber structure is composed of a very thin fluoroplastic cladding, the thickness is generally only 10 um to 15 um, and its function is to continuously reflect the light propagating in the optical fiber core back into the optical fiber core to prevent light leakage, especially It is the quality state of the interface of the core layer between the fluoroplastic and the PMMA, which directly affects the performance of the fiber attenuation. The quality of the interface is affected by the co-extrusion process during production. The parameters such as time, temperature, ratio, speed and material properties of the co-extrusion process directly affect the state of the interface.

The production capacity of different single-core plastic optical fiber production lines depends on the processing capacity of the PMMA extrusion screw. This processing capacity is affected by factors such as the area of the screw heating the screw, the number of revolutions of the screw, the physical size of the screw, and the characteristics of the extruded material. Therefore, after repeated adjustment and testing, an extrusion line can find an optimal extrusion state and determine the optimal extrusion speed, which ultimately determines the daily production capacity of the production line. For example, in the single-core co-extrusion production method, PMMA and fluorine raw materials are extruded through a plastic optical fiber die with a diameter of 1 mm, and the production speed is 1 meter per second, which is the optimum extrusion speed.

However, this production method has the following problems:

Since the fluidity of fluororesin is not as good as that of PMMA, at the extrusion speed of 1 m/s of single-core plastic fiber, the fluororesin material is limited by the narrow extrusion space of the die and the flowability of PMMA is relatively poor, which can not meet the requirement of 1 m/s. Stable production speed, resulting in uneven thickness of the fiber cladding, too thin, light leakage and poor interface quality, affecting the attenuation performance of the fiber. Even if the extrusion strength is increased, this problem cannot be solved due to the fluidity and the limitation of the space of the die mouth.

Due to the above reasons, the thickness of the fluororesin is insufficient or uneven, resulting in poor toughness of the plastic optical fiber, and is not suitable for the requirements of the application site. The optical fiber is prone to breakage or cracking and affects the quality of communication.

Although it can be considered to reduce the extrusion speed of PMMA to solve the above problems caused by the mismatch of the fluidity of the fluorine material, the PMMA material must have a longer residence time in the screw due to the decrease in the extrusion amount, and the temperature of the material will deviate excessively due to excessive heating. The effective control range makes the material thermal reaction time too long, and the fiber quality decreases.

In theory, the raw material extruder production capacity can be reduced to solve the problem of material fluidity matching.

The first method is to reduce the PMMA and fluorine material extrusion equipment in proportion, and the extrusion speed per unit time decreases at the same time, while the mold does not change. At this time, the relative extrusion amount of the fluorine extrusion port of the mold is decreased to be equal to the disguised phase, so that the problem of poor fluorine fluidity can be solved. This method will have a new problem, that is, if the fluorine extrusion speed is correspondingly reduced, the size of the fluorine extrusion screw should be reduced. If the fluororesin raw material is made of a grain material, the crystal shape is mostly 2×3 mm, and the existing one. The fluorine extrusion screw is changed to small, and the fluorine material is difficult to be fed into the spiral space of the screw; if the powder material is used, it is found through experiments that the material has poor continuity in the screw operation. This directly affects the feeding process, which limits the reduction in the physical size of the screw, which makes it difficult to reduce the extrusion speed of the fluororesin. Therefore, this method is difficult to solve this problem.

The second method is to reduce the size of the PMMA extrusion equipment and reduce the extrusion speed, while reducing the rotation speed of the fluororesin extruder without reducing the size, thereby achieving the purpose of simultaneously reducing the extrusion speed of the fluororesin. Since the extrusion amount of the cladding material is only 0.09 to 0.1 g/s, which is already small, the rotation speed of the fluorine extruder is already low, and the rotation speed can no longer be lowered.

Therefore, Method 1 and Method 2 are not suitable for scale production and affect product quality.

In addition, the single-core production method uses plastic optical fibers to complete the shaping process directly in the indoor space after extrusion at the die. When the fiber is extruded from the die, the temperature is higher, mostly more than one hundred degrees. For different fluorine materials and different PMMA materials, the temperature is different; while the indoor air temperature is generally below 40 degrees, and extrusion The instantaneous fiber temperature difference is very large, so that the temperature of the fiber near the die is relatively high, and the temperature of the fiber is gradually decreased after leaving the die due to the ambient temperature, resulting in a large difference in the temperature of the plastic fiber along the fiber exit direction. The condensation state is different, but it is affected by the same tensile force of the shaping process, which has a great influence on the material shape of the fiber material, so that the results of the fiber drawing and setting are easily different, and the produced fiber has poor consistency. At the same time, stretching and setting in the ambient air immediately after extrusion, the degree of purification, humidity, fluidity and other factors in the air have an impact on the shaping process. This type of stereotype is not suitable for producing high-performance, high-quality industrial plastic optical fiber products.

That is to say, the single-core extrusion production method is difficult to solve the problem of fluidity mismatch and air setting of the fiber-clad fluororesin material, resulting in unstable optical fiber production quality, uneven cladding thickness, poor fiber toughness or optical fiber. The attenuation is large and cannot meet the requirements of the product standard. These problems can not be solved by slowing down the production speed, nor by reducing the amount of extrusion, but also solving the corresponding problems caused by changing the air shaping.

Therefore, the prior art needs improvement.

Summary of the invention

The technical problem to be solved by the present application is to provide a new plastic optical fiber, a preparation method thereof and a preparation device.

The technical solution of the present application is as follows: a method for preparing a plastic optical fiber, comprising the steps of: coordinating the fluidity of the fluororesin raw material with the fluidity of the PMMA raw material; and matching each mixed branch flow channel of the plurality of mixed branch flow channels A fluororesin raw material and a PMMA raw material.

Preferably, each mixed branch flow channel of the plurality of mixed branch flow channels collectively matches the extruded fluororesin After the raw material and the PMMA raw material, the following steps are also performed: stretching and setting in a constant temperature oil medium.

For example, a plurality of optical fibers are stretched and shaped in a constant temperature oil medium.

Preferably, after the stretching and setting in the constant temperature oil medium, the following step is also performed: fiber drawing.

For example, multiple sets of fiber drawing. For another example, after the fiber is drawn, the following steps are also performed: fiber collection; for example, multi-unit co-fibre.

For example, a plurality of sets of fiber drawing can be realized by a wire drawing unit.

Preferably, when each of the plurality of mixed branch flow channels collectively matches the extruded fluororesin raw material and the PMMA raw material, the flow path temperature control is also performed.

Preferably, the flow channel temperature control comprises separately obtaining temperature corresponding parameters of the fluid materials in each flow channel, and separately performing temperature control to change the temperature of the fluid material in each flow channel.

Preferably, after coordinating the fluidity of the fluororesin raw material and the fluidity of the PMMA raw material, and in each mixed branch flow path of the plurality of mixed branch flow paths, the method is prior to matching the extruded fluororesin raw material and the PMMA raw material, the method The method further includes the steps of: inputting the fluororesin raw material and the PMMA raw material into a plurality of branch flow passages respectively, and continuing to coordinate the fluidity of the fluororesin raw material and the fluidity of the PMMA raw material.

Another technical solution of the present application is as follows: a preparation device for a plastic optical fiber, comprising a co-extrusion die, a PMMA extruder, and a fluororesin extruder; the PMMA extruder and the fluororesin extruder are respectively connected a co-extrusion die for coordinating the fluidity of a fluororesin raw material with the fluidity of a PMMA raw material by the co-extrusion die; the co-extrusion die is provided with a co-extrusion die for jointly matching the extruded fluororesin raw material and the PMMA raw material .

Preferably, the preparation device further comprises a zoned shaped fuel tank for tensile setting in a constant temperature oil medium.

Preferably, the zoned shaped fuel tank is provided with a fully enclosed thermostatic zone.

For example, the zoned shaped fuel tank is a fully enclosed zoned shaped fuel tank.

For example, the fully enclosed zone shaped fuel tank is provided with a plurality of relatively independent zones, each of said The partitions respectively set the partition independent temperature control system; for example, the fully enclosed partition shaped fuel tanks are provided with a plurality of relatively independent partition tanks, and each of the partition tanks is provided with a partition independent temperature control system; wherein each partition tank is independent Temperature control is also independent. For example, in the partition tank, the runners are no longer split, and after the multi-core fibers are extruded, they pass through each of the partition tanks.

Preferably, the preparation device further comprises a tank thermostat system for controlling the temperature of the zoned set tank. Preferably, the preparation device has a relatively decreasing temperature in each of the fully enclosed thermostatic zones along the fiber exiting direction, and the temperature of the first fully enclosed thermostatic zone is 1/2 to 2/3 of the die extrusion temperature. The other order is decremented until the temperature of the final fully enclosed thermostat zone is set to ambient temperature.

Preferably, the preparation device further comprises a flow channel independent temperature control system for respectively acquiring temperature corresponding parameters of the fluid materials in the respective flow channels of the co-extrusion die, and respectively performing temperature control to change or maintain the fluid materials in the flow channels. temperature.

Preferably, the partition sizing tank is provided with a plurality of fully enclosed constant temperature zones; the preparation device further comprises a partition independent temperature control system for respectively acquiring temperature corresponding parameters of the oil medium in each of the fully enclosed thermostatic zones, and separately performing The temperature is controlled to constant the temperature of the oil medium in each of the fully enclosed thermostat zones.

Preferably, the co-extrusion die is further provided with a plurality of branch flow channel groups, each branch flow channel group includes a PMMA core branch flow channel, a fluorine resin cladding branch flow channel, and a mixed branch flow channel;

An output end of the PMMA core branch flow channel and an output end of the fluororesin clathing flow channel are respectively connected to an input end of the mixed branch flow channel, and an output end of the mixed branch flow channel is matched with an extrusion station The fluororesin raw material and the PMMA raw material are described.

A further technical solution of the present application is as follows: A plastic optical fiber obtained by any of the above preparation methods.

By adopting the above solution, the present invention produces a plastic optical fiber by a plurality of core co-extrusion methods, which helps to solve the problem of fluidity mismatch and air shaping of the fiber cladding fluororesin raw material, and can improve the stability of the optical fiber production quality, and realizes The cladding thickness is relatively uniform, the fiber toughness is good, and the fiber is good. The effect of small attenuation is high and has high market application value.

DRAWINGS

1 is a schematic diagram of a production process of an embodiment of the present application;

2 is a schematic structural view of still another embodiment of the present application;

FIG. 3 is a schematic structural view of still another embodiment of the present application.

detailed description

In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the accompanying drawings and specific embodiments. It is to be noted that when an element is described as being "fixed" to another element, it can be directly on the other element, or one or more central elements can be present. When an element is referred to as "connected" to another element, it can be a <RTI ID=0.0> </ RTI> </ RTI> <RTIgt; The terms "vertical," "horizontal," "left," "right," and the like, as used in this specification, are for the purpose of illustration.

Unless otherwise defined, all technical and scientific terms used in the specification are the same meaning The terms used in the specification of the present application are for the purpose of describing the specific embodiments and are not intended to limit the application. The term "and/or" used in this specification includes any and all combinations of one or more of the associated listed items.

Plastic optical fiber can replace copper network cable, and achieve the effect and purpose of saving copper resources, energy saving and environmental protection. Plastic optical fibers have expanded applications in many fields. Large data cloud technologies such as communication networks, local office networks, and intelligent IoT networks can also be widely promoted and applied in control, power, smart cars, high-speed trains, medical and defense industries. Because plastic optical fiber is not afraid of electromagnetic interference, and is not afraid of vibration, its characteristics and advantages are outstanding, so it is of great use in military and national defense undertakings. However, the communication plastic optical fiber with attenuation of less than 180dB/km is currently only industrialized in Japan, and has not been industrialized in other countries and countries. Industrial scale and city of plastic optical fiber The capacity of the field is huge, and the impact on the country's various industry needs and the environment cannot be ignored. In particular, high-performance communication plastic optical fiber is a new product of optical fiber in data transmission and communication applications, and has great market prospects and development space.

The military industry hopes that the high-performance communication plastic optical fiber will be localized as soon as possible and will be applied to China's national defense construction as soon as possible. Through the above production methods and production processes, it is possible to ensure the production of high-quality communication plastic optical fibers, and industrial production of such high-performance communication plastic optical fibers, breaking the monopoly position of Japanese companies in this industry.

The purpose of the application is to overcome the mismatch problem caused by the difference in fluidity between the cladding material and the core material when the PMMA plastic optical fiber is produced by the single core extrusion method, and to achieve the adjustment cladding by the innovative multi-core extrusion method. The fluidity is consistent with the fluidity of the core material. At the same time, it solves many problems of direct stretching and setting in the environmental space, and thus can produce high-performance PMMA communication plastic optical fiber.

An embodiment of the present application is a method for preparing a plastic optical fiber, comprising the steps of: coordinating the fluidity of a fluororesin raw material with the fluidity of a PMMA raw material; and matching each mixed branch flow path of the plurality of mixed branch flow channels The fluororesin raw material and the PMMA raw material are extruded. Among them, PMMA (polymethyl methacrylate) raw material is a core material, and fluororesin raw material is a cladding material. Wherein, each mixed branch flow channel of the plurality of mixed branch flow channels collectively matches the extruded fluororesin raw material and the PMMA raw material, comprising the steps of: outputting the PMMA raw material as a core, and outputting the fluororesin raw material as a cladding layer, The extrusion is matched together to form an optical fiber. Another example is to jointly control the extrusion of the fluororesin raw material and the PMMA raw material, and also perform feedback control on the co-extrusion die, for example, temperature feedback control of the co-extrusion die; and, for example, temperature feedback control of each flow channel of the co-extrusion die Preferably, temperature feedback control is performed on each mixed branch flow path of the co-extrusion die.

Coordination of the fluidity of the fluororesin raw material with the fluidity of the PMMA raw material is used to coordinate the extrusion of the PMMA with the extrusion of the fluororesin raw material, which is the basis for the subsequent matching extrusion. For example, after coordinating the fluidity of the fluororesin raw material and the fluidity of the PMMA raw material, a plurality of mixed branch flow paths are Before each mixed branch flow channel is matched with the extruded fluororesin raw material and the PMMA raw material, the method further comprises the steps of: respectively inputting the fluororesin raw material and the PMMA raw material into a plurality of corresponding flow channels, for example, inputting the fluororesin raw material into the plurality of fluororesin raw materials; a flow path, and the PMMA raw material is input into a plurality of PMMA raw material flow channels; preferably, when the fluororesin raw material and the PMMA raw material are respectively input to the plurality of flow paths, the fluidity of the fluororesin raw material and the fluidity of the PMMA raw material are continuously coordinated; In other words, the fluororesin raw material and the PMMA raw material are input to a plurality of flow paths, and the fluidity of the fluororesin raw material in each flow channel and the fluidity of the PMMA raw material are coordinated. Preferably, the fluororesin raw material and the PMMA raw material are respectively input. Flow channel temperature control is also performed for multiple flow paths. For example, temperature control is performed separately for each of the flow paths. In order to improve the efficiency, reduce the volume and the number of devices, for example, a predetermined number of flow channels are used as one flow channel partition, or a plurality of flow paths at a preset position are used as one flow channel partition, and the temperature of the flow channel partition is separately performed. Control, so that temperature control can be simultaneously performed on several flow channels in one flow channel partition at the same time.

In order to achieve better fiber output, preferably, after each mixed branch flow path of the plurality of mixed branch flow channels is matched with the extruded fluororesin raw material and the PMMA raw material, the following steps are performed: stretching and setting in the constant temperature oil medium . For example, a plurality of optical fibers are stretched and shaped in a constant temperature oil medium. Preferably, after the stretching and setting in the constant temperature oil medium, the following step is also performed: fiber drawing. For example, multiple sets of fiber drawing. For another example, after the fiber is drawn, the following steps are also performed: fiber collection; for example, multi-unit co-fibre. For example, a plurality of sets of fiber drawing can be realized by a wire drawing unit.

Preferably, when each of the plurality of mixed branch flow channels collectively matches the extruded fluororesin raw material and the PMMA raw material, the flow path temperature control is also performed. Preferably, the flow channel temperature control comprises separately obtaining temperature corresponding parameters of the fluid material in each flow channel, and separately performing temperature control to change or maintain or constant the temperature of the fluid material in each flow channel. Wherein, the constant temperature of the fluid material in each flow channel, or the temperature of the fluid material in each flow channel, is a relatively stable temperature concept, or can be understood as a relatively stable temperature region, so as to achieve relative stability. The temperature environment, for example, the temperature range is 50 to 60 degrees Celsius; for example, the temperature range is 90 to 95 degrees. Degrees, and so on, set or adjust according to the actual needs of production, the same below. For example, when each mixed branch flow channel of the plurality of mixed branch flow channels collectively matches the extruded fluororesin raw material and the PMMA raw material, a plurality of partitions are further disposed, and each partition includes a plurality of flow paths, and flow channel temperature control is performed in the partition; For example, each mixed branch flow path of the plurality of mixed branch flow channels collectively matches the extruded fluororesin raw material with the PMMA raw material and/or each mixed branch flow path of the plurality of mixed branch flow paths to match the extruded fluororesin raw material and After the PMMA raw material, the flow channel temperature control is also performed; thus, the temperature control of several flow paths in one partition can be simultaneously performed, which simplifies the operation and is also advantageous for cost saving.

A further embodiment of the present application is as follows: a plastic optical fiber obtained by the preparation method described in any of the embodiments; or a preparation device prepared by using any of the embodiments.

Still another embodiment of the present application is as follows: a device for preparing a plastic optical fiber, comprising a co-extrusion die, a PMMA extruder, and a fluororesin extruder; wherein the PMMA extruder and the fluororesin extruder are respectively connected a co-extrusion die for coordinating the fluidity of a fluororesin raw material with the fluidity of a PMMA raw material by the co-extrusion die; the co-extrusion die is provided with a co-extrusion die for jointly matching the extruded fluororesin raw material and the PMMA raw material . For example, the co-extrusion die is provided with a co-extrusion die for jointly matching the extruded fluororesin raw material with the PMMA raw material to form an optical fiber, or the co-extrusion die is provided with a co-extrusion die for jointly matching the extruded fluororesin The raw material and the PMMA raw material are passed through a subsequent treatment process to form an optical fiber.

For example, the co-extrusion die is provided with a co-extrusion die and a plurality of branch flow channels, wherein the branch flow channels include a PMMA core branch flow channel, a fluororesin cladding branch flow channel, and a mixed branch flow channel. For another example, the plurality of branch flow channels include a plurality of PMMA core branch flow channels, a plurality of fluororesin cladding branch flow channels, and a plurality of mixed branch flow channels. In order to extrude a plurality of optical fibers at a time, preferably, the co-extrusion die is provided with a plurality of co-extrusion die ports, and each co-extrusion die is used to jointly match the extruded fluororesin raw material and the PMMA raw material to form an optical fiber. Forming an optical fiber, for example, by a subsequent processing step; or, the co-extrusion die is provided with a plurality of the co-extrusion die, each of the co-extrusion die for jointly matching the extruded fluororesin raw material and the PMMA raw material to form An optical fiber, for example, forms a fiber by a subsequent processing procedure. So on and so forth.

For example, a plastic optical fiber preparation apparatus includes a co-extrusion die, a PMMA extruder, and a fluororesin extruder; the PMMA extruder and the fluororesin extruder are respectively connected to the co-extrusion die; The co-extrusion die is provided with a co-extrusion die and a plurality of branch flow channels, wherein the branch flow channel comprises a PMMA core branch flow channel, a fluororesin cladding branch flow channel and a mixed branch flow channel; the PMMA extruder respectively An input end of each of the PMMA core branch flow channels is connected, and the fluororesin extruder is respectively connected to an input end of each of the fluororesin cladding branch flow channels, and the input ends of each of the mixed branch flow channels respectively correspond to And connecting at least one output end of the PMMA core branch flow channel and at least one output end of the fluororesin branch flow channel; an output end of each of the mixed branch flow channels is disposed at the co-extrusion die. Preferably, the input ends of each of the mixed branch channels are respectively connected to the output end of the PMMA core branch channel and the output end of the fluororesin branch channel.

For example, as shown in FIG. 2, the preparation device includes a co-extrusion die, a PMMA extruder, and a fluororesin extruder; the PMMA extruder and the fluororesin extruder are respectively connected to the co-extrusion die; The co-extrusion die is provided with a co-extrusion die port and a plurality of branch flow channel groups; FIG. 2 shows three groups of branch flow channel groups; each of the branch flow channel groups includes a PMMA core branch flow channel, a fluorine resin package a branch branch flow channel and a mixed branch flow channel; in each of the branch flow channel groups, an input end of the PMMA core branch flow channel is connected to the PMMA extruder, and the fluororesin cladding branch flow channel The input end is connected to the fluororesin extruder, the output end of the PMMA core branch flow channel and the output end of the fluororesin clathing branch flow channel are respectively connected to the input end of the mixed branch flow channel, through the An output end of the mixed branch flow channel is connected to the co-extrusion die to output an optical fiber, that is, an output end of the mixed branch flow channel outputs a PMMA core and a fluororesin cladding at the co-extrusion die, through the co-extrusion die Outputting the plastic optical fiber to be processed later, that is, to be processed by a subsequent step or process or device Or the output end of the mixed branch flow passage passes through the co-extrusion die output fiber, that is, the output end of the mixed branch flow passage passes through the co-extrusion die to output the PMMA core and the fluororesin package Layers to form plastic fibers to be processed later, and so on.

Preferably, the preparation device further comprises a zoned shaped fuel tank for feeding in the constant temperature oil medium Line stretching and shaping. Preferably, the zoned shaped fuel tank is provided with a fully enclosed thermostatic zone for achieving a constant temperature environment for tensile setting; preferably, the zoned shaped fuel tank is provided with a plurality of fully enclosed thermostatic zones; the preparation device further comprises a partition An independent temperature control system is configured to separately obtain temperature corresponding parameters of the oil medium in each of the fully enclosed thermostatic zones, and separately perform temperature control to constant the temperature of the oil medium in each of the fully enclosed thermostatic zones. For example, the partition shaped fuel tank is provided with a plurality of fully enclosed constant temperature zones, and each fully enclosed constant temperature zone respectively corresponds to a partition independent temperature control system, and each of the partitioned independent temperature control systems is configured to obtain the corresponding full The temperature of the oil medium in the thermostatic zone is closed and the temperature is controlled to constant the temperature of the oil medium in the fully enclosed thermostatic zone. Or a plurality of partition oil tanks are disposed in the fully enclosed constant temperature zone, and the preparation device further comprises a partition independent temperature control system, configured to respectively acquire temperature corresponding parameters of the oil medium in each of the partition oil tanks, and respectively perform temperature control The temperature of the oil medium in each of the zoned tanks is constant. For example, a multi-stage temperature zone is provided along the fiber exit direction, for example, the zone includes a zoned shaped fuel tank, a fully enclosed thermostatic zone or a zoned tank; for example, the preparation device is provided with a multi-stage zoned fuel tank or multiple stages along the fiber exit direction. a fully enclosed constant temperature zone or a multi-stage zone tank; for example, the preparation device sequentially sets a multi-stage zoned shaped fuel tank or a multi-stage fully enclosed constant temperature zone or a multi-stage zoned fuel tank along the fiber exit direction; for example, in a multi-stage temperature zone The temperature sequence is decreasing, the temperature of the first temperature zone is 1/2~2/3 of the extrusion temperature of the co-extrusion die, and the other order is decreasing until the temperature of the end temperature zone is the ambient temperature; for example, along the fiber exit direction, The zoned shaped fuel tank or each fully enclosed thermostatic zone or each zoned fuel tank is arranged side by side, that is, each stretched and shaped plastic optical fiber sequentially passes through each zoned shaped fuel tank or each fully enclosed constant temperature zone or each zoned fuel tank. As another example, the zoned shaped fuel tank is a fully enclosed zoned fuel tank. For example, the fully enclosed partition shaped fuel tank is provided with a plurality of relatively independent partitions, that is, the fully enclosed constant temperature partition; each of the partitions is respectively provided with a partition independent temperature control system; for example, the fully enclosed partition shaped fuel tank is provided with a plurality of Relatively independent partition tanks, each of the partition tanks is provided with a partition independent temperature control system; wherein each partition tank is independent, and the temperature control is independent. For example, in the partition tank, the runners are no longer split, and after the multi-core fibers are extruded, they pass through each of the partition tanks.

Preferably, the preparation device further comprises a flow channel independent temperature control system for respectively acquiring temperature corresponding parameters of the fluid materials in the respective flow channels of the co-extrusion die, and separately performing temperature control to change or maintain or constant in each flow channel. The temperature of the fluid material. Preferably, each branch flow channel has an independent temperature controlled heating system.

Preferably, the hybrid branch flow channel and/or the partition independent temperature control system further comprises a sensor for sensing temperature information, obtaining temperature, that is, temperature corresponding parameter, also called temperature data, or can be understood as a mixed branch flow channel and/or Or the temperature data of the partition; for example, the temperature corresponding parameter is correspondingly transmitted to the mold temperature control system or the partition temperature control system (ie, the partition constant temperature tank control group). Preferably, the sensor is a pressure type temperature sensor, or the sensor is a thermal temperature sensor. For example, the hybrid branch flow channel is also provided with a number of sensors including a plurality of pressure temperature sensors and/or several thermal temperature sensors.

Preferably, the sensor of the hybrid branch flow channel is connected to an independent temperature control heating system of each branch flow channel in the corresponding branch flow channel group for independently controlling corresponding temperature information output by the sensor a temperature controlled heating system of each branch flow channel in the branch flow channel group.

For example, a plastic optical fiber preparation apparatus is as shown in FIG. 3, which includes a co-extrusion die 300, a PMMA extruder 120, and a fluororesin extruder 220; for example, the preparation device further includes a PMMA raw material for input. a PMMA raw material input device 110 and a fluororesin raw material input device 210 for inputting a fluororesin raw material, and the PMMA extruder 120 and the fluororesin extruder 220 are respectively connected to the co-extrusion die 300 for passing the The co-extrusion die coordinates the fluidity of the fluororesin raw material and the fluidity of the PMMA raw material; the co-extrusion die 300 is provided with a co-extrusion die 310 for collectively matching the extruded fluororesin raw material with the PMMA raw material. This way, on the one hand in the PMMA extruder and the fluorine tree The output of the fat extruder coordinates the fluidity of the fluororesin raw material and the fluidity of the PMMA raw material. On the other hand, the fluidity of the fluororesin raw material and the fluidity of the PMMA raw material are coordinated in the co-extrusion die, so that the coextrusion die is squeezed. When the fluororesin raw material and the PMMA raw material are discharged, the fluidity of the fluororesin raw material matches the fluidity of the PMMA raw material, so that a high-quality plastic optical fiber can be obtained.

The PMMA raw material is input to the PMMA extruder 120 through the PMMA raw material inputter 110. For example, the PMMA extruder is provided with a first screw, for example, a PMMA raw material is extruded by a spiral extrusion method, for example, the PMMA raw material is introduced into the PMMA extruder. For the PMMA material; for example, the PMMA extruder extrudes the PMMA raw material to the PMMA core total flow path; the fluororesin raw material is input to the fluororesin extruder 220 through the fluororesin raw material input unit 210, for example, a fluororesin extruder is provided The second screw is, for example, a fluororesin raw material extruded by a spiral extrusion method. For example, the fluororesin raw material is referred to as a fluororesin material after entering the fluororesin extruder; for example, the fluororesin extruder extrudes the fluororesin raw material to the fluororesin package. Preferably, the size, pitch and rotation speed of the first screw and the second screw are set according to the fluidity of the fluororesin raw material and the fluidity of the PMMA raw material, so that the output fluororesin raw material and the PMMA raw material are kept constant. The ratio is so as to facilitate subsequent matching of the extruded fluororesin raw material with the PMMA raw material.

The co-extrusion die 300 has a co-extrusion die 310, and a plurality of fluororesin-clad branch flow channels 301, a PMMA core branch flow channel 302, a hybrid branch flow channel 303, a flow channel sensor 304, and a sensor are further disposed in the co-extrusion die 300. The group information transmission line 305, the sensing data of the flow path sensor 304, such as temperature, temperature information or temperature-related information, is output to the mold temperature control system through the sensor group information transmission line 305; wherein the input end of each mixed branch flow path 303 The output end of the PMMA core branch flow channel 302 and the output end of the fluororesin cladding branch flow channel 301 are connected one by one. For example, the PMMA extruder is connected to the input end of each of the PMMA core branch flow passages 302 through the PMMA core total flow passage, and the fluororesin extruder passes through the fluororesin cladding total flow passage. The input ends of the respective fluororesin cladding branch channels 301 are connected, respectively.

For example, the co-extrusion die 300 is provided with a plurality of branch flow channel groups, and each of the branch flow channel groups includes a PMMA core branch flow channel 302, a fluorine resin cladding branch flow channel 301, and a mixed component. a branch channel 303; in each of the branch flow channel groups, an input end of the PMMA core branch flow channel 302 is connected to the PMMA extruder 120, for example, by the PMMA core total flow channel connecting the PMMA Exiting; the input end of the fluororesin clad branch flow channel 301 is connected to the fluororesin extruder 220, for example, by the fluororesin cladding total flow channel to the fluororesin extruder; the PMMA fiber An output end of the core branch flow path 302 and an output end of the fluororesin branch flow channel 301 are respectively connected to an input end of the mixed branch flow path 303, and an output end of the mixed branch flow path is matched with an extruded fluororesin The raw material and the PMMA raw material are used to form an optical fiber, wherein the optical fiber is a plastic optical fiber, the core of the plastic optical fiber is PMMA, and the cladding of the plastic optical fiber is a fluororesin. It is understood that the PMMA and the fluororesin can be used as the background art. The material of the plastic optical fiber of the prior art single core extrusion die, the focus of the present application and its various embodiments is not on the material improvement of PMMA and fluororesin.

For example, the preparation apparatus is further provided with a zoned shaped fuel tank for effecting temperature-controlled shaping of the optical fiber; preferably, as shown in FIG. 3, the co-extrusion die 300 is coupled to the zoned shaped fuel tank 400, for example, the co-extrusion die 300. The partition shaping oil tank 400 is connected through the co-extrusion die 310, and the fixed-type circulating oil is provided in the partition-shaped fuel tank, and the exchange and circulation of the fixed-circulating oil is realized through the shaping circulation oil port 410; for example, the partition-shaped fuel tank is used to pass the shaping cycle The oil achieves temperature controlled shaping of the optical fiber. For example, the zoned shaped fuel tank is used to provide a constant temperature oil medium and to stretch and shape each fiber in a constant temperature oil medium; for example, the zoned shaped fuel tank is provided with several zones. For example, the zone sizing tank 400 is provided with at least one zone heater 420 corresponding to one of the zones for heating the zone in the zone sizing tank to set the constant temperature oil medium The circulating oil maintains a preset constant temperature, wherein the preset constant temperature is set according to the production requirements of the plastic optical fiber, and can be adjusted according to actual production conditions.

For example, the preparation apparatus is further provided with a wire drawing unit for performing fiber drawing after stretching and setting in a constant temperature oil medium. For example, the wire drawing unit is used to pull out a number of fibers at a time. For example, as shown in FIG. 3, the zoned sizing tank 400 is coupled to the wire drawing unit 500 for drawing a plurality of fibers 600 at a time. For example, through a co-extrusion die and its co-extrusion die, a zoned shaped fuel tank and a wire drawing machine The cooperation of the group realizes the extrusion of a plurality of optical fibers at a time, that is, the production mode of multi-core co-extrusion is realized.

In another embodiment of the present application, the production process is as shown in FIG. 1. The PMMA raw material is input to a PMMA extruder, the PMMA extruder is a PMMA material extruder, and the PMMA extruder is extruded with a PMMA raw material (ie, a PMMA material). ) to the co-extrusion die; the fluororesin raw material is input to the fluororesin extruder, the fluororesin extruder is the fluororesin material extruder, and the fluororesin extruder extrudes the fluororesin raw material (ie, the fluororesin material) to the co-extrusion die The co-extrusion die is matched with the extruded fluororesin raw material and the PMMA raw material at a plurality of extrusion ports, and is stretched and shaped by the partitioned constant temperature oil, for example, by partitioning the shaped fuel tank, performing stretching and setting in the constant temperature oil medium in the zoned shaping oil tank, and then entering Fiber drawing unit, fiber-optic packaging after drawing. For example, temperature sensing is performed in a co-extrusion mold to obtain induction data, that is, temperature-related information; for example, temperature sensing of temperature of a fluid material in each flow path inside the co-extrusion mold is induced to obtain sensing data, and, for example, inside a co-extrusion mold The temperature of the fluid material in each mixed branch flow channel is temperature-sensed to obtain the sensing data, and the sensing data is transmitted to the flow channel temperature control unit group (ie, the mold temperature control system), and the flow channel temperature control unit group flows the co-extrusion mold according to the sensing data. The temperature control of the channel, that is, the temperature control of all the flow channels or all the mixed branch flow channels in the co-extrusion die, is very important for the subsequent shaping and drawing processes, and can ensure the quality of the optical fiber is up to standard. For another example, when performing tensile setting in a constant temperature oil medium, sizing temperature feedback control is also performed; for example, shaping temperature feedback control is also performed on the fully enclosed thermostatic zone 430 in the zoned sizing tank and/or the zoned sizing tank; for example The co-extrusion die matches the extruded fluororesin raw material and the PMMA raw material at a plurality of extrusion ports, and when the partitioned constant temperature oil is stretched and shaped, the temperature sensor 421 sends the partition temperature information to the partitioned constant temperature tank control group (ie, the partition independent temperature control system 440). The partition independent temperature control system 440 performs temperature control on the zoned shaped fuel tank or the fully enclosed thermostatic zone or the zoned shaped fuel tank or the zoned tank according to the zone temperature information.

Compared with the existing single-core output technology, the present application and its embodiments provide a method for preparing a plastic optical fiber and a preparation device thereof. As described in the above embodiments, the production method can be understood as a multi-core co-extrusion drawing production method. Referring to the multi-core co-extrusion method, in the multi-core co-extrusion mode, the PMMA extruder and the fluororesin extruder are the same as the single-core coextrusion method, and the co-extrusion mold is changed from the single-core mold structure. It is a multi-core mold structure. For example, in the multi-core mold structure, a PMMA core branch flow path, a fluororesin cladding branch flow path, and a mixed branch flow path in which the cladding and the core are merged are added. For another example, each branch flow channel has an independent temperature control heating system, and the mixed branch flow channel is also equipped with a sensor, and the branch flow channel heating system is independently controlled by the output information of the sensor.

Among them, without changing the PMMA extruder and the fluororesin extruder, the co-extrusion die output port is changed from a single to N, and the fiber production mode is changed from a single root to a plurality of wires. In this way, the two extruders are not changed, and the raw materials are kept in the extrusion process, and the optimum extrusion process is maintained to ensure that the raw materials entering the co-extrusion mold flow path are optimal in temperature and pressure. status. Since the two extruders have not changed, the reforming cost can be reduced, and after the multi-core co-extrusion mold is used, the feeding state of the system does not change, the volume of the extruded material provided per unit time does not change, and it is easy to flexibly adjust according to experience. . Moreover, after changing to a multi-core mold, the extrusion speed of the raw material from each die is changed to 1/N, and the mold outlet of the fluororesin is changed from a single core to a multi-core N, that is, a single The volume of the extrusion port is increased to N times, which will greatly improve the extrusion state of the fluorine material, so that the fluidity of the fluororesin raw material and the flowability of the PMMA raw material are more harmonious, so that the extrusion state is more matched, the fiber cladding and the core The layer interface is ideal. This multi-core production method makes it easy to achieve the refractive index requirements of raw materials. PMMA is 1.492, and fluororesin raw materials are 1.40 to 1.42, which are common raw materials, so that no additional deployment is required, which reduces product cost.

For example, the sensor in the branch flow channel temperature control heating system can adopt pressure type or other types of sensors, and the purpose is only to control the temperature of the fluid material in the flow channel by the information of the sensor, and to control the flow rate by changing the temperature of the fluid. The purpose is to make the fluid outflow balance in each branch flow channel uniform during the multi-core extrusion process, and the produced fiber has stable physical properties and good consistency.

After the plastic optical fiber is extruded, it is shaped in a fully enclosed constant temperature zone tank, and the whole process of the stretching and setting is carried out in a constant temperature oil medium. The fully enclosed thermostatic zone shaped fuel tank is divided into a plurality of relatively independent fully enclosed thermostatic zones 430. Each zone has an independent temperature control system 440 that controls each individual zoned heater so that the temperatures of the different zones are constant at different temperature values. Preferably, in the direction of the fiber exit, the temperature in each thermostatic zone is relatively decremented, the first The partition temperature can be fixed at a die temperature or temperature value of 1/2 to 2/3, and the other is decremented until the final partition comes out and the ambient temperature is reached. This process ensures that the temperature of the plastic fiber is the same at the same point in the same zone, and the tensile force results are the same, while ensuring that the air purification, humidity, fluidity and other factors have no effect on the shaping process. . At the same time, this method also solves the problem that the plastic optical fiber is cooled into the air of the environmental space immediately after being extruded from the high temperature state of the extrusion port, and the stress of the plastic optical fiber is generated under the sudden change of the large temperature.

The application and its various embodiments have the advantages of high production efficiency and good product quality. The specific production test is described below. During the test, the continuous extrusion amount of 100 kg is maintained in a PMMA extruder for 24 hours, with an average of The extrusion amount per second is about 1.16g, the fluororesin extruder extrudes 8kg every 24 hours, and the average extrusion per second is about 0.093g. The plastic fiber extrusion with a diameter of 1mm is produced by a six-core co-extrusion die. The extrusion speed of the die is 20cm/s, and the production capacity of the production line is about 10 to 120,000 meters. After trial production, the average attenuation value of the produced plastic optical fiber is between 167dB and 179dB per kilometer, which meets the requirements of high-quality communication plastic optical fiber.

Further, the embodiment of the present application further includes the plastic optical fiber formed by combining the technical features of the above embodiments, the preparation method and the preparation device thereof, and the fiber cladding fluorine present in the single core extrusion production mode is solved. The problem of mismatched fluidity of the resin raw materials and air shaping improves the stability of the optical fiber production quality, and achieves the effects of relatively uniform cladding thickness, good fiber toughness, and small fiber attenuation.

It should be noted that the preferred embodiments of the present application are given in the specification of the present application and the accompanying drawings. However, the present application can be implemented in many different forms, and is not limited to the embodiments described in the specification. The examples are not intended to be limiting as to the scope of the present application, and the embodiments are provided to make the understanding of the disclosure of the present application more comprehensive. Further, each of the above technical features is further combined with each other to form various embodiments that are not enumerated above, and are considered to be within the scope of the specification of the present application; further, those skilled in the art can improve or change according to the above description. All such improvements and modifications are intended to fall within the scope of the appended claims.

Claims

A method for preparing a plastic optical fiber, comprising the steps of:

Coordinating the fluidity of the fluororesin raw material and the fluidity of the PMMA raw material;

The extruded fluororesin raw material and the PMMA raw material are collectively matched in each mixed branch flow path of the plurality of mixed branch flow channels.
The preparation method according to claim 1, characterized in that, after matching the extruded fluororesin raw material and the PMMA raw material in each mixed branch flow path of the plurality of mixed branch flow channels, the following steps are further performed: in the constant temperature oil medium Stretch stereotypes.
The preparation method according to claim 2, wherein after the stretching and setting in the constant temperature oil medium, the following step is further performed: the fiber is drawn.
The preparation method according to claim 1, wherein in each of the plurality of mixed branch flow passages, when the extruded fluororesin raw material and the PMMA raw material are collectively matched, flow channel temperature control is further performed.
The preparation method according to claim 4, wherein the temperature control of the flow channel comprises separately obtaining temperature corresponding parameters of the fluid material in each flow channel, and separately performing temperature control to change the temperature of the fluid material in each flow channel.
The preparation method according to claim 1, wherein after the fluidity of the fluororesin raw material and the fluidity of the PMMA raw material are coordinated, and in each mixed branch flow path of the plurality of mixed branch flow paths, the extruded fluorine is collectively matched. Before the resin raw material and the PMMA raw material, the method further comprises the steps of: respectively inputting the fluororesin raw material and the PMMA raw material into a plurality of branch flow passages, and continuing to coordinate the fluidity of the fluororesin raw material and the fluidity of the PMMA raw material.
A device for preparing a plastic optical fiber, comprising: a co-extrusion die, a PMMA extruder, and a fluororesin extruder;

The PMMA extruder and the fluororesin extruder are respectively connected to the co-extrusion die for Coordinating the fluidity of the fluororesin raw material with the fluidity of the PMMA raw material by the co-extrusion die;

The co-extrusion die is provided with a co-extrusion die for collectively matching the extruded fluororesin raw material with the PMMA raw material.
The preparation apparatus according to claim 7, wherein said preparation apparatus further comprises a zoned shaped oil tank for performing tensile setting in a constant temperature oil medium.
The preparation apparatus according to claim 8, wherein said zone shaping oil tank is provided with a fully enclosed thermostatic zone.
The preparation device according to claim 9, wherein the partition sizing tank is provided with a plurality of fully enclosed thermostatic zones; and the preparation device further comprises a partition independent temperature control system for respectively acquiring each of the fully enclosed thermostatic zones The temperature of the medium medium is corresponding to the parameters, and temperature control is respectively performed to constant the temperature of the oil medium in each of the fully enclosed constant temperature zones.
The preparation device according to claim 7, wherein the co-extrusion die is further provided with a plurality of branch flow channel groups, each branch flow channel group comprising a PMMA core branch flow channel and a fluororesin cladding layer. a branch runner and a mixed branch runner;

An output end of the PMMA core branch flow channel and an output end of the fluororesin clathing flow channel are respectively connected to an input end of the mixed branch flow channel, and an output end of the mixed branch flow channel is matched with an extrusion station The fluororesin raw material and the PMMA raw material are described.
A plastic optical fiber obtained by the production method according to any one of claims 1 to 6.