Polyphenylene Sulfide (PPS) Fiber Production line

Zhangjiagang Tengxiang Machinery Manufacturing Co., Ltd. and a company in Sichuan carried out transformation and replacement of some technical problems and key equipment of the Polyphenylene Sulfide (PPS) Fiber polyphenylene sulfide short fiber production line, so that the technical indicators and performance of the polyphenylene sulfide short fiber were changed. There has been a substantial improvement.

The full name of polyphenylene sulfide is polyphenylene sulfide. It is a thermoplastic resin with a phenylsulfide group in the main chain of the molecule. Polyphenylene sulfide is a crystalline polymer. The undrawn fiber has a large amorphous zone (crystallinity is about 5%), crystallization exotherm occurs at 125°C, the glass transition temperature is 150°C, and the melting point is 281°C. The drawn fiber produced partial crystallization during the drawing process (increased to 30%). For example, heat treatment of the drawn fiber at a temperature of 130-230°C can increase the crystallinity to 60-80%. Therefore, the drawn fiber has no obvious glass transition or crystallization exotherm, and its melting point is 284°C. With the increase of crystallinity after stretching and heat setting, the density of fiber also increases correspondingly, from 1.33g/cm3 before stretching to 1.34g/cm3 after stretching, and it can reach 1.38g/cm3 after heat treatment. Molding shrinkage: 0.7% Molding temperature: 300-330℃.

PPS is a special engineering plastic with excellent comprehensive performance. PPS has excellent high temperature resistance, corrosion resistance, radiation resistance, flame retardancy, balanced physical and mechanical properties, dimensional stability, and excellent electrical properties. It is widely used as a structural polymer material. It is widely used after filling and modification. Used as special engineering plastics. At the same time, it can also be made into various functional films, coatings and composite materials, which have been successfully applied in the fields of electronics, aerospace, and automobile transportation. Domestic enterprises are actively researching and developing, and have initially formed a certain production capacity, which has changed the situation of relying solely on imports in the past. However, China’s PPS technology still has problems such as fewer product varieties, fewer high-functional products, and urgent expansion of production capacity, which will be the focus of PPS’s next development.

Production capacity and regional distribution of major polyphenylene sulfide (PPS) producers in China

 

Company
Location
Capacity (MT)
Xinhecheng
ZheJiang
5000
Deyang
Sichuan
34000
Haohua Honghe
SiChuan
30000
Yiteng Hi-Tech
Inner Mongolia
10000
Western Region Special Fiber
Gansu
4000
Jiangsu Ruitai
JiangSu
5000

Introduction of polyphenylene sulfide staple fiber production line equipment

This equipment uses slices as raw materials, melts, filters, and spins the spinning box to measure and send to the spinning assembly. It is cooled by blowing to form and oiled into the nascent fiber, and then bundled, hauled, and fed to the silk barrel. After being balanced, the strips are sent to the post-processing process.

Spinning is composed of main production equipment, auxiliary production equipment and public engineering equipment.

1. Equipment composition process:

1.1. The main production equipment of the front spinning: mainly drying raw materials → feeder → silo → screw extruder → filter → spinning box → metering pump transmission device → metering pump → spinning assembly → ring blowing device → winding machine →The silk barrel is composed of transmission machine and electric control.

1.2. Auxiliary production equipment: component decomposition → cleaning → spinneret inspection and sea sand preparation → assembly → preheating; blending with oil; physical inspection and laboratory testing.

1.3. Public works: substation, water supply system, air pressure system, heat conduction oil furnace system, steam generator system, air conditioning system and other comprehensive facilities.

2. Process introduction

After drying, the slices are heated and melted by a screw extruder, and the melt enters the spinning box through the melt pipeline after melting, mixing, and filtering. In the spinning box, the melt is distributed through pipelines, and is metered and delivered to each spinning position with equal passing time and pressure drop, so that the quality of the melt in each part is consistent. Each spinning position is equipped with a high-precision high-pressure spinning metering pump, and the melt is continuously and accurately supplied to the spinning assembly at high pressure. The spinning pump is driven by a synchronous motor, and the speed of each metering pump is adjusted and controlled by its own frequency converter. The spinning component is equipped with filter mesh and filter sand and other filter materials to filter out impurities in the melt; the filter, melt pipeline and spinning box are heated by the electric heater to heat the heat conduction oil to achieve heat preservation, the spinning box A hot oil circulating pump is used to circulate the heat transfer oil to a uniform temperature to ensure the uniform temperature of each spinning position. After the melt is ejected from the spinneret, it passes through the monomer extraction device, and the low damping ring is blown and cooled to solidify. This change is greatly affected by the speed uniformity of the air flow on the ring blowing. The control of the wind temperature and the blowing distance are all direct factors that affect the quality of the staple fiber. Therefore, the wind blown by the ring blowing device is required to have stability, uniformity and good adjustable performance. The cooled and solidified filaments are oiled and moisturized by the oiling device to increase the cohesive force of the fibers, improve the antistatic performance of the fibers, reduce the friction between the fibers and the equipment, and improve the after-effects of the fibers. Processing performance.

After each spinning position tow passes through the oil tanker yarn guide system on the winding frame, it is guided by the rotor and the yarn guide wheel to the tail end of the machine, enters the traction roller, and then is fed into the silk bucket by the feeding wheel. Eight-roller tractor, the feeding wheel is driven by a synchronous motor. The meshing depth of the feeding wheel can be adjusted according to the winding process. The spinning and winding system is equipped with a centralized communication system. The transmission method of the silk drum is a turntable type. After being balanced, the full thread is sent to the post-processing process.

2. Overview of Finishing line:

This complete set of equipment is used for bundling, drawing, crimping, relaxation, heat setting, cutting, and packaging to produce short fiber products.

Post-processing equipment is composed of main production equipment, auxiliary production equipment and public engineering equipment, and mainly includes the following parts:

1. Process flow of Finishing line

Bunch frame→six-roller wire guide→oil immersion tank→first drafting machine→water-bath drafting tank→second drafting machine→steam drafting box→third drafting machine→stacking machine→spraying oiling→crimping Steam box→crimper→conveyor belt laying machine→relaxation heat setting machine→oil spray→traction machine→tension machine→cutting machine→baler.

2. Process description of Finishing line

Each row of the cluster rack can be arranged with 10 Fiber Cans, divided into 4 rows, a total of 40 barrels. The number of silk barrels can be adjusted according to the needs of production varieties.

The tow from the cluster frame is divided into two tows by the front guide wire machine, and then spread into filaments, and then guided through the guide wire machine, and passed through the oil immersion tank to make the tows spread into filaments of a certain width and uniform thickness. Make the spinning finish layer on the tow more uniform, and then enter the drafting. There are two drafts in this production line, and one draft is carried out between the first drafting machine and the second drafting machine. The drawing temperature required for one drawing is 60-80℃, which is provided by the drawing oil bath. One draft completes a draft ratio of about 80-85%. The second drafting is carried out in the steam heating box between the second drafting machine and the tension heat setting machine; the drafting temperature is about 95-100℃; the second drafting completes about 15-20% of the draft ratio . After passing through the second drafting zone, the yarn has all the orientations of its molecular structure; the yarn is oiled and the two tows are stacked into one piece by a yarn stacking machine. The width of the silk sheet and the quality of the overlap directly affect the quality of the crimp. After being heated by the steam preheating box, the laminated filaments enter the crimping machine to crimp the filaments. The thread pieces from the crimper are sent to the dryer for cooling and drying. The cooled and dried tow passes through a tension machine with traction, and is fed into the cutting machine from the tangential direction of the cutter head under uniform tension, cut into short fibers of the required length, and sent to the baler through the air conveying system, and compressed Into a package. After being weighed by the conveyor device, the bag is sewn, labeled, and delivered to the warehouse or loading place with a forklift. The driving of the drafting section of the main equipment of the post-processing line is completed by AC speed control, and the speed is adjusted by the frequency converter. The post-processing control system is composed of the main control cabinet and the on-site operation console (used for the crimping device, cutting machine, and packing device) arranged in a separate room.