Wuhan Handern Salivated Nylon 6 Film
DATE：2020/5/21 8:32:55 / READ： / SOURCE：This station
Wuhan Handern Salivated Nylon 6 Film
1. Main raw materials www.handern.com breathable membrane equipmentThe main raw material is nylon 6 resin.
2. Main equipment www.handern.com breathable membrane equipment
The salivated nylon 6 film is extruded with PA-6 resin through an extruder, passes through a T-shaped die to form a molten film, and is quickly wrapped on a very smooth roller, compressed with an air flow, then peeled off, naturally cooled and shaped. And the highly transparent film formed. The main equipment Barmag FF2 / 1400 production line is mainly composed of the following five parts. www.handern.com Breathable membrane equipment
(1) Extruder. When the salivating film is formed, the uniform distribution of the melt, the subsequent process and the homogeneity requirements necessary for the use of the film are subject to the special uniform temperature of the melt at the outlet of the extruder. When the production volume is large, the polymer in the extruder must be heated from room temperature to a processing temperature of 200 ℃ -290 ℃ within a few seconds. The friction of objects. Therefore, when the plastic begins to melt in the screw channel, a melt film will first be generated around the polymer. Due to the low thermal conductivity of the melt, a temperature difference phenomenon will occur in the molten fluid. If the corresponding temperature difference phenomenon is not taken , Will be maintained until the melt output.
The temperature measuring device utilizes temperature sensors distributed in 9 melt regions to systematically measure different temperatures and the function of the homogenizing device. From this measurement result, an LTM screw was developed. The LTM screw is equipped with a companion device, which can equalize the melt temperature in all melt areas under the same conditions, and can achieve the lowest thickness tolerance of the melt distribution of the cast film. It can meet the requirements of product homogeneity in the use or follow-up process. The FF2 / 1400 production line extruder adopts LTM screw to make the extruded molten material of good quality. The screw diameter is 90mm, the screw length-to-diameter ratio D is 331, the screw speed is 125r / min, the extruder drive power is 101kW, the extruder barrel material is bimetallic, and the screw material is surface nitriding tool steel. The fuel part of the machine barrel has no groove, the cooling system of the extruder barrel is air-cooled (4 stages), and the cooling mode of the feeding section is water cooling. www.handern.com Breathable membrane equipment
(2) Filter and screen changing device. The homogeneity and purity of the melt have special significance for the safety of the subsequent process and product quality. The melt is not only affected by foreign impurities, but also by the unmelted particles of the melt, which greatly reduces the degree of polymerization. The generation of unmelted particles is due to the different residence time in the production process and the dispersion of hard gel particles into the melt. The spots and fish eyes seen on the film are unmelted particles. The FF2 / 1400 production line solves the purity problem with an overspeed device. The filter area of this filter is enlarged as much as possible through the disc-shaped method, so that after the filter mesh with a mesh width of less than 20m overlaps, the pressure difference is less than 50Pa It can also reach a filtration speed of less than 1m per second. The filter body adopts average heating, and the selected melt guide surface can make the melt passing time even and equal. In the process of stream nylon production, the regeneration and reuse of side material is essential to increase productivity and reduce product cost. When the amount of side material reaches a certain percentage, the clogging of the filter is very serious. Therefore, stopping the operation of the equipment in order to replace the filter has become an important factor affecting production efficiency. The FF2 / 1400 production line uses a sliding screen changer, that is, 4 working filters are installed on the slide plate, and the control rod of the hydraulic cylinder is instantaneously replaced to shorten the time for changing the screen. The electric heating power of the filter replacement device is 0.55kW, the filter area is the caliber of the extruder, and the exchange is an instant exchange.
(3) Melt metering pump. The use of a metering pump makes the extruded molten material a constant quantity when it enters the machine head, and is not affected by voltage, ambient temperature, and passive extrusion, thus creating the necessary conditions for manufacturing high-quality films. F2 / 1400 production line adopts melt meter
The delivery capacity of the metering pump is 150mLh, the transmission power is 4.6kW, and the continuous degree variation range is 0-31L / min. www.handern.com Breathable membrane equipment
(4) T-shaped head. When designing and manufacturing, the material, form and gap adjustment device of the T-shaped head must be fully considered. Otherwise, it will cause thickness fluctuations, rough barrels on the surface of the film, decomposition of the material to stop sliding, and openings in the mold layer. The T-shaped head of the single-layer flow film can be divided into straight branch tube type and fish tail type. The resin with good thermal stability and fluidity uses a straight manifold type. The structure of this head is simple, but when the width is large, the width is not uniform in thickness, and the material stops sliding; the fishtail type head for heat-sensitive plastics, this structure It can make the molten material flow evenly, but the head is too large and heavy when making wide film. The hanger type head is a combination of straight slope tube type and fish tail type. The F3 / 1400 production line uses this structure. The die width is 1320mm, the die gap range is 0.25mm-1m, the adjustment bolt spacing is 25mm, the number of heating zones is 7, and the heating power is 21kW. www.handern.com Breathable membrane equipment
(5) Flow device. In the salivation film equipment, the predetermined film substrate must be cooled and fixed. The film must be cooled from the melt temperature to room temperature. In order to ensure the quality of the film, it is also important to cool uniformly in addition to the average temperature requirement. The cooling device plays a very important role on the source film: ① After the base film exits the T-shaped head, it is cooled uniformly to the specified temperature: ② The base surface does not produce any defects, wrinkles, etc .; ③ prevents the film from shrinking.
The Liuxian device of the FF2 / 1400 production line is placed on a rail that can be moved back and forth, and the base film is cooled with water at about 90 ° C. Because Liuxuan can move up, down, back and forth to adjust, it is possible to choose the best Liuxian point on Liuxue. The thyristor DC motor equipped with precision gear box ensures proper flow speed. www.handern.com Breathable membrane equipment
The width of the flow roller is 1400mm, the maximum capping speed is 100m / min, the diameter of the flow roller is 610mm, the transmission power is 2.5kW, and the temperature range is 30 ℃ -130 ℃. The cooling roller is placed behind the flow roller, with a diameter of 460mm, a transmission power of 1.7kW, and a temperature variation range of 30 ° C-130 ° C.
In order to make the film make good contact with the Liu roller, there is a stepless adjustable air knife above the Liu roller, and a rubber pressure below, which uses electrostatic bonding, air flow and other methods to promote the bonding of the film and the roller. There is a handful of suction near the flow point, which is used to take less room gas to promote cooling and remove gas. www.handern.com Breathable membrane equipment
Author：admin