CN102230233A - One-step Direct Spinning Technology of Polyester Industrial Yarn - Google Patents

Abstract

The invention relates to a spinning process of polyester industrial yarns, in particular to a one-step direct spinning process of polyester industrial yarns, and belongs to the field of spinning. The invention fills the blank of producing industrial polyester fiber by a domestic continuous solid phase polymerization, spinning and drafting one-step process route, a fluidized bed type pre-crystallizer and a stirring type crystallizer are adopted, a second rotary valve is added for controlling the blanking speed, a third rotary valve is used for isolating an air system and a nitrogen system, materials are continuously added into the pre-crystallizer by utilizing potential difference, slices are crystallized in the continuous fluidized bed pre-crystallizer, the slices crystallized to set crystallinity are continuously added into the stirring type crystallizer by utilizing the potential difference for further crystallization, PET slices are heated to the temperature required by solid phase polymerization in a pre-heater and then continuously enter a solid phase polymerization tower for solid phase polymerization, and the processes of preheating to the solid phase polymerization and drying are completed in a nitrogen medium. It has high yield, simple process and easy control.

Description

One-step Direct Spinning Technology of Polyester Industrial Yarn

technical field

The invention relates to a textile process of polyester industrial yarn, in particular to a one-step direct spinning process of polyester industrial yarn, which belongs to the textile field.

Background technique

Since the United States successfully applied polyester fibers to cords in the 1960s, after more than 40 years of research and development, the application fields of polyester industrial yarns have continued to expand. In 1979, my country began to conduct a two-step polyester industrial yarn production process test. In the late 1980s, the spinning and pulling combined one-step polyester industrial yarn production line was introduced from abroad. According to the statistics of China Chemical Fiber Industry Association, by 2007, there were more than 46 polyester industrial filament production enterprises in my country, with a total production capacity of 467,800 tons, of which more than 17 enterprises imported equipment, and only the top 10 enterprises in the industry had a total production capacity of 30.46. 10,000 tons, accounting for more than 65% of the total production capacity.

In 2007, the total production capacity of the world's polyester industrial filament was about 1.8 million tons, and China's polyester industrial filament already accounted for 32% of the world's total production capacity and ranked first. We are not only a big producer, but also a big consumer. Especially in recent years, with the rapid development of my country's automobile industry, transportation industry, highway, mining industry, etc., the demand for polyester industrial yarn has grown at a rate of nearly 10% every year. According to customs statistics, the import volume of polyester industrial yarn in my country from January to February 2008 was 5,900 tons, and the import unit price was 2270.07 US dollars per ton; the import unit price of 1-2 polyester industrial yarn in 2008 was 1.12 times the import unit price of general polyester filament.

With the continuous economic growth, China has become one of the countries with the most promising economic development prospects in Asia and even in the world. Especially with the rapid development of the automobile industry in recent years, the market demand for polyester industrial yarn in China has remained high, which will surely drive my country's polyester industrial filament industry into a period of rapid development, and the market space is huge. China has undoubtedly become the production center of polyester industrial filament in the world.

At present, the textile processes used in the polyester industry are generally: direct spinning one-step method, direct spinning two-step method, chip spinning one-step method and chip spinning two-step method. The widely used method is the one-step method of slice spinning, which is flexible in production, convenient in changing varieties, easy in management, and good in product quality, but its investment is high and it is not suitable for widespread promotion.

Contents of the invention

In view of the above technical problems, the purpose of the present invention is to provide a one-step direct spinning process of polyester industrial yarn, which fills the gap in the domestic market of our country.

The one-step direct spinning process of polyester industrial yarn of the present invention adopts a method in which continuous solid-phase polymerization of ethylene phthalate is combined with one-step spinning and drawing; the ethylene phthalate adopts continuous solid-phase polymerization, and The process is: conventional PET slices are vibrated and screened into the large silo for wet slicing, the PET slices in the large silo for wet slicing are transported into the small silo for wet slicing at a height of 60 meters, and the PET slices in the small silo pass through the first Rotary valve control continuously enters the pre-crystallizer for pre-crystallization; the pre-crystallized PET slices are controlled by the level gauge of the stirring crystallizer and continuously enters the stirring crystallizer for crystallization; after crystallization, the PET slices pass through the second and third The rotary valve enters the pre-heater, and the PET slices are heated in the pre-heater. After heating, they enter the solid-phase polymerization tower continuously for solid-phase polymerization; the polymerized PET slices are transported to the finished product silo by airflow; The sticky slices are transported to the pre-spinning silo by air flow, and then enter the screw extruder by their own weight. The slices are melted, extruded, mixed, and homogenized in the screw extruder, and then extruded from the machine head, and passed through the melt pipeline. Enter into two spinning boxes respectively; each spinning box is equipped with two spinning positions, each with 6 spinning components, and produces 6 bundles of filaments; after the melt is accurately measured by the spinning metering pump, it is passed through the spinning The filament assembly is ejected from the spinneret, cooled and solidified by the side blowing device, and then wound into shape after two oiling, two pre-netting, three drafting and main netting nozzles.

The speed of the third rotary valve: 1-30rpm, isolating the air system and the nitrogen system during the crystallization and drying process. The pre-crystallization hot air temperature is 170°C, the pre-crystallization time is 15-30min, the crystallization hot air temperature is 170°C, and the crystallization hot air flow is 2800 Nm3/h; the nitrogen inlet temperature of the preheating tower is 200°C, and the nitrogen inlet of the preheating tower The flow rate is 3200 Nm3/h, the nitrogen inlet temperature of the solid phase polymerization tower is 200°C, and the nitrogen inlet flow is 3300 Nm3/h.

Both the pre-crystallization and crystallization are completed in air medium.

The second rotary valve is used to control the feeding speed, and the third rotary valve is used to isolate the air system from the nitrogen system.

The process from preheating to solid phase polymerization is completed in a nitrogen medium.

The invention fills up the gap in the production of industrial polyester fibers by the one-step process route of domestic continuous solid-phase polymerization, spinning and drawing, and adopts a fluidized bed pre-crystallizer and a stirring crystallizer, adding a second rotary valve for Control the feeding speed. The third rotary valve is used to isolate the air system from the nitrogen system. The material is continuously added to the pre-crystallizer by using the potential difference. The slices are crystallized in the continuous fluidized bed pre-crystallizer, and the crystallization reaches the set The slices of crystallinity are continuously added to the stirring crystallizer by using the potential difference for further crystallization. The PET slices are heated to the temperature required for solid-phase polymerization in the pre-heater and then continuously enter the solid-phase polymerization tower for solid-phase polymerization. Preheating The solid phase polymerization and drying processes are all completed in a nitrogen medium. Its high output, simple process, easy production control, and high efficiency and flexibility of equipment have improved the development and production of differentiated fiber varieties, alleviated the shortage of industrial polyester fiber supply in my country, and greatly promoted the development of my country's chemical fiber industrial structure. Adjustment, and make my country's polyester industrial yarn equipment and technical level reach the international advanced level. It not only saves a lot of foreign exchange expenditure for the country, but also promotes the rapid development of my country's polyester industrial yarn industry.

Detailed ways

One-step direct spinning process of polyester industrial yarn, which adopts continuous solid-phase polymerization of ethylene phthalate and one-step method of spinning and drawing; said ethylene phthalate adopts continuous solid-phase polymerization, and the process is : Conventional PET slices are vibrated and screened into the large silo for wet slicing, and the PET slices in the large silo for wet slicing are transported into the small silo for wet slicing at a height of 60 meters, and the PET chips in the small silo pass through the first rotary valve The control continuously enters the pre-crystallizer for pre-crystallization; the pre-crystallized PET slices are controlled by the level gauge of the stirring crystallizer and continuously enters the stirring crystallizer for crystallization; the crystallized PET slices pass through the second and third rotary valves Entering the pre-heater, the PET slices are heated in the pre-heater, and then enter the solid-phase polymerization tower continuously for solid-phase polymerization after heating; the polymerized PET slices are transported to the finished product silo by airflow; the thickened slices in the finished silo It is transported to the pre-spinning silo by air flow, and then enters the screw extruder by its own weight. After being melted, extruded, kneaded and homogenized in the screw extruder, the chips are extruded from the machine head, and then enter through the melt pipe respectively. Two spinning boxes; each spinning box is equipped with two spinning positions, each with 6 spinning components, producing 6 bundles of filaments; after the melt is accurately measured by the spinning metering pump, it passes through the spinning components Sprayed from the spinneret, cooled and solidified by the side blowing device, after two oiling, two pre-internetting, three drafting and main network nozzles, it is wound into shape. The speed of the third rotary valve: 1-30rpm, isolating the air system and the nitrogen system during the crystallization and drying process. The pre-crystallization hot air temperature is 170°C, the pre-crystallization time is 15-30min, the crystallization hot air temperature is 170°C, and the crystallization hot air flow is 2800 Nm3/h; the nitrogen inlet temperature of the preheating tower is 200°C, and the nitrogen inlet of the preheating tower The flow rate is 3200 Nm3/h, the nitrogen inlet temperature of the solid phase polymerization tower is 200°C, and the nitrogen inlet flow is 3300 Nm3/h. Both the pre-crystallization and crystallization are completed in air medium. The second rotary valve is used to control the feeding speed, and the third rotary valve is used to isolate the air system from the nitrogen system.

Claims (5)

1. the one-step method Direct Spinning technology of polyester industrial yarn, the method that it adopts the continuous solid phase of ethylene diester to match with spinning drawing-off one-step method; It is characterized in that: described ethylene diester adopts continuous solid phase, its process is: conventional PET section is selected materials through vibrating screen and is entered wet section big material bin, PET section in the wet section big material bin is through delivering into the wet section small feed bin of 60 meters eminences, and control enters and carries out pre-crystallization in the pre-crystallizer PET section in the small feed bin continuously through first revolving valve; The PET section of pre-crystallization is controlled to enter continuously through the level-sensing device of agitated crystallizer and is carried out crystallization in the agitated crystallizer; PET section after crystallization is finished enters pre-heater through second, third revolving valve, and the PET section is heated in pre-heater, enters continuously after the heating and carries out solid phase in the solid-state polymerization tower; PET after the polymerization cuts into slices by gas delivery in finished product bin; The section of tackify in the finished product bin,, is cut into slices in screw extruder and to be extruded from head after fusion, extruding, mixing, homogenizing again by reentering certainly in the screw extruder to spinning preceding feed bin through gas delivery, enters two spinning manifold bodies respectively through melt pipe; Every spinning manifold is provided with two spinning stations, and every 6 filament spinning components are produced 6 synnemas; Melt, sprays from spinnerets by filament spinning component accurately after the metering through spinning pump, pass through lateral blowing device cooling curing again after, through twice oil, winding shaping behind the pre-network of twice, three road drawing-offs and the master network nozzle.

2. the one-step method Direct Spinning technology of polyester industrial yarn according to claim 1 is characterized in that: described the 3rd revolving valve rotating speed: 1～30rpm, isolate air system in crystallization and the dry run and nitrogen system; Pre-crystallization hot blast temperature is 170 ℃, and pre-crystallization time is 15-30min, and the crystallization hot blast temperature is 170 ℃, and the crystallization heat wind flow is 2800 Nm3/h; 200 ℃ of described preheating tower nitrogen intake air temperature, preheating tower nitrogen charge flow rate 3200 Nm3/h, solid-state polymerization tower nitrogen intake air temperature is 200 ℃, nitrogen inlet air flow 3300 Nm3/h.

3. the one-step method Direct Spinning technology of polyester industrial yarn according to claim 1, it is characterized in that: described pre-crystallization and crystallization all are to finish in air dielectric.

4. the one-step method Direct Spinning technology of polyester industrial yarn according to claim 1, it is characterized in that: described second revolving valve is used for controlling blanking velocity, and the 3rd revolving valve is used for air system and nitrogen system are isolated.

5. the one-step method Direct Spinning technology of polyester industrial yarn according to claim 1, it is characterized in that: the described process that preheats solid phase is finished in nitrogen medium.