Roving Machine Process, Types and Use For

The main function of the roving machine is to draw and twist the fiber strips into roving to meet the needs of spinning machine processing.

What is roving used for?

The hoop strips produced in the drawing frame are relatively heavy and need to be drawn 50 to 400 times to achieve the required performance to achieve fineness of yarn. At present, the spinning machine does not have such a large pulling capacity. In the 1950s it was common practice to carefully spin the yarns using a large draw-spinning machine. The yarn length decreases while at the same time there is direct loadingng of the spinning machine in strip form Difficult and not economical in many respects.

Therefore, in the traditional spinning process, in order to ensure the quality of the yarn, a roving process is used between the link and the fine yarn to divide part of the yarn through However, new spinning technologies such as rotary spinning, jet spinning, friction spinning and dust cage spinning eliminated the roving process. However, it is still necessary to maintain the roving process when spinning most yarn counts, especially those with fine yarn counts and high quality requirements. The tasks of the roving process are:

1. The mature drafting strips are drawn, lengthened and thinned and spun into roving to match the drafting capacity of the spinning frame.

2. The roving is properly twisted to give it a certain strength. It can be wrapped into a specific shape i.eie convenient for storage and handling, and suitable for unwinding the feed when spinning frame to prevent accidental pulling.

3. AfterThe pulling and twisting of the roving frame can further improve the separation, smoothing and cleanliness of the fibers, make the spinning frame easier to pull, and improve the quality of the yarn.

What is the roving process? Roving Quantification

Under the condition of standard temperature and humidity, the weight per unit length of roving is called quantification. The amount of roving should be determined according to the combination of the matured amount, the drawing capacity of the spinning machine, the yarn count grade, and the performance of the roving equipment. When spinning pure cotton yarn, the number of mature streaks is 2.5~6g/m, the drawing capacity of the spinning machine is 12~45 times, and the draw ratio of the roving machine is 5~11.< /p>

Spindle speed

The spindle speed control range of domestic traditional spindle assist rotorsThe frame is: coarse yarn 500-700rpm, medium yarn 600-85rpm, extra-fine yarn 800-900rpm /min The suspended ingot roving frame can break through the above range, the general fine count can reach 1000rpm.

Stretch Total Drawback Multiplier: The total drawdown multiplier selected by the flyer is primarily determined by the count of fine yarns, the spinning frame drawdown multiplier, and the amount of strips cooked. At present, with the development of the Due to the heavy weight of the mature strip, the spinning machine has generally adopted the double-ring big pull, and the stretching device of the roving frame requires strong adaptability and wide rangeeich of stretching multiples. The stretch ratio of double ring roving frame is generally 4 ~ 12. In order to ensure product quality, it is not recommended to use less than five times the draft, generally the highest use of 9 to 10 times, rarely to 11 times. When spinning extra fine yarn, in addition to increasing the draft ratio of coarse and filing the yarn accordingly, it is necessary to reduce the number of mature strips. Too high a stretch ratio leads to a deterioration in the uniformity of the short pieces of the product.

Draft Distribution: The drafting system with three rollers and double spools has better control over the fiber, and the main drawing is only the front and rear drawing. The rear zone stretch ratio should be as small as possible, typically 1.15 to 1.25, so as not to disperse the whisker streaks too much in the fiber rear zone tonot to weaken the adhesive force between the fibers. In the four-roller double-ring drafting system, the draw is fixed between the front roller and the second roller. The main stretching area of ​​the second and third roller is the drawing surface of the spine between the third and fourth roller. Clamping distance of roller and collar pin: In the case of double collaring, the width of the epithelial collar pin is first chosen according to the length of the process SSed fiber. In general, there are three kinds of pin widths: short to adapt to all kinds of raw cotton and chemical fiber under 40mm, the middle of chemical fiber under 50mm, and large for the chemical fiber under 65mm. In the form of three-roller double-coil stretching, the distance between the front, middle and bottom rollers must be determined according to the width of the epithelial pin and the length of the free zone. Distance of leather ring brackets: It is determined according to the fiber properties, the quantityive weight of mature strips and rovings, and the degree of control of the fiber by the elastic clamp of the leather ring.

Roller Pressure
Roller Pressure: The roller pressure of the Roving frame is designed to ensure the roller clamp mouth has enough holding power to overcome the pulling force and prevent yarn slippage and speed stratification at the roller clamp mouth. The spring pressure of the roving frame can be adjusted according to the pulling force. In order to ensure normal pulling, the exit roller pliers are located in the main pulling area of ​​the double coil, it needs to maintain a large pressure. Due to the low draft force in the rear area, the pressure between the top and bottom rollers and between the rear roller can be low. The warping force dependst depends on the fiber property, amount and distortion multiplier and roller spacing, which should be fully considered. In addition, the running speed of the roller must also be taken into account. In general, high-speed pressure should be high, and vice versa. Aggregator: The aggregator on the roving frame is mainly adjusted upwards to prevent fiber diffusion. The opening size of the collector, the front area should be adapted to the discharge volume and the rear area to the feed. The entry aggregator is adapted to the feeding ration.Twist

Roving should have a certain twist to withstand the tension of winding and unwinding the roving in the next process to reduce abnormal elongation and prevent broken ends. The twist, on the other hand, serves as an additional frictional limit, stretching the yarn back to control the movement of the fibers. The twist of the roving will mainly youch determines the length of the fiber and the fineness of the roving. It is also selected considering other properties of the fiber, the process, the spinning back area and the collapse of the roving end.

Winding Density

Roving density has a direct impact on roving capacity, so it must be tight be wound to increase capacity. The axial density configuration must be based on The principle of yarn ring alignment. For small yarns, the distance between the roving rings is less than 0.5 mm. Under the condition of naked eye observation, the surface of the tube when the first yarn layer is wound is faintly seen. Gaps should not be too dThe yarn should not be too dense to prevent embedding and overlapping.

Ravage Tension

Ravage is a low-twist product. After being subjected to tension, it is easy to accidentally warp,which causes the yarn to come loose. If the tension is too large, the accidental pull will increase and the roving will be damaged. If the tension is too low, the weight of the full hose will be reduced and it will be difficult to carry, store and unwind. Therefore, the tension too large will affect the breakage rate of the roving frame and spinning frame, increase labor intensity and reduce production efficiency. If the tension difference of roving between different pastilles on the same table and row is too large, the difference in roving packing and capacity will increase. This will not only affect the quality of roving, broken ends and the normal operation of the roving frame, but will affect also affects the working method of the roving pagoda section on the spinning frame and increases the labor intensity of the workers. If the If the tension difference between large and small yarns, front and backarnen and between tables is too large, it directly affects the unevenness of long roving segments and the weight of fine yarns. So, in order to spin quality yarn, we need to control the roving tension.

What are the different types of roving?

The roving frame is divided into wing roving frames and twisting roving frames according to the twisting mechanism. The roving frame creates spun roving by continuously imparting a twist to the strip of yarn by twisting The spun wing. The spinning roving machine relies on a pair of rolling plates to pinch and twist the yarn strips, creating a false twist that alternates between positive and negative twist on the yarn strips so as not to produce twisted roving. Block Roving Frame and Twisting Roving Frame can be divided into first, second and single roving frames. Different roving frames have different feeding forms,Roving rolls and machine number of ingots, but the machine structure and function are differentUgly the same.

DW7030H Lab Roving Frame

DW7030H is a model independently developed by Fanyuan. It is used for spinning cotton fibers for weaving by drawing and flyer spinning. It is the ideal system for teaching, research, etc. .

FeaturePLC, drive and servomotor from Delta brand; PLC + touch screen control, easy to learn and operate; Use touch screen as man-machine interface, input technical parameters and display machine working status through touch screen; Use Z turning turning; Spindle speed accurate to ±1%; Aluminum profile body frame with four castors, freely movable; Modular independent drive for character, spindle blade and flyer; Ball line guide rail pair design, low friction resistance and low power consumption, ensuring the reliability of the support platem moving up and down; Multifunctional design, easy to clean, adjust and maintain.

Mainframe DiagramSpecification

Control ModeTouch Screen and PLCNumber of Spindles Applicable Fiber Length2 22~50mmCan Size250mm×550mmRoller Size28/28/28mmPressure ModeSpring WeightedTrain Multiple4~12 SpeedRotation Range15~80 rotation / mFlyer ShapeHanged Spindle Speed ​​Range20~800RPM Roving Bobbin Sizeφ45×445mmCapacityApproximately 0.25~1kg/hYarn Density Range200~1,000tex

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