• 通用banner
    Jiangsu Rongyue Textile Co., Ltd

    138-1667-2429

    : Manager Hua

    : +00886-138-1667-2429

    :+00886-515-82209488

    : Mark@rytextile.com

    : Science and Technology Innovation Park, Siming Town, Sheyang County, Yancheng City


    Ten reasons and solutions of spinning hard end

    2020-07-25 09:04:19
    second

    The basic reason is that the drawing force is greater than the gripping force. All the factors that affect the drawing force and gripping force may cause the draft not to open. The main factors, such as raw materials, technology, machinery, temperature and humidity, will seriously affect the spinning quality and production efficiency.

    1 roving twist factor

    When the roving twist factor is large, the density of roving yarn increases, the cohesion is good, the friction resistance between fibers increases, and the traction response. Under the condition that the spacing of the back area and the draft ratio of the back area remain unchanged, the sliver can not be effectively untwisted and enters into the main drafting area with a large twist back, resulting in the phenomenon that the drafting cannot be opened. However, the roving twist factor should not be too small. If it is too small, it is easy to produce unexpected draft when feeding into the spinning frame, resulting in details and affecting the product quality.

    2 yarn guide motion

    When the movement direction of the yarn guide is the same as the twist direction of the sliver, the drawing force is large, and the holding force is less than the drawing force. When the twist direction of the sliver is opposite to the movement direction of the guide yarn, the draft force is small, which is beneficial to reduce the draft failure.

    3 roving weight

    The increase of roving quantity means the increase of drawing force. In the same cot state and the same back zone draft ratio and roving twist factor, the spinning holding force of heavy weight roving is greater than that of light weight roving, so roving sizing has higher requirements for spinning draft holding force. The ration of roving should be adapted to the gap between the nips, so as to avoid the violent fluctuation of the draft force at the nips during the spinning drafting process, which will affect the normal drafting of the spinning.

    4 spinning roller gauge

    The small roller spacing is beneficial to the control of the floating fiber in the sliver, which makes the stretching force of the sliver increase during the drafting process, and the phenomenon of non opening of the draft is easy to occur. After roller spacing, the ability to control the floating fiber in the whisker is weakened, so that the fiber can be well controlled and drawn normally, and the phenomenon of no drawing is avoided.

    5 draft in back zone of spinning

    After the drafting multiple in the back area of spinning, the number of fibers in the cross section of the whisker entering the main drafting area is reduced, and the drafting force is reduced, which is conducive to the control of the fiber in the whisker by the drafting jaw and the reduction of the phenomenon of draft failure, but generally speaking, it is not conducive to the improvement of the yarn quality. At present, most of the production enterprises adopt larger spinning back roller, smaller back draft multiple and larger roving twist factor.

    6 spinning nip gauge

    The smaller nip spacing block is beneficial to strengthen the control ability of apron nip to draft yarn, and has better control ability to the edge fiber of whisker when the fiber changes speed, so as to improve the yarn evenness. When the gauge block is increased, the control force of aprons on the sliver is weakened, and the phenomenon of draft not being opened can be reduced, but the yarn quality is affected to a certain extent.

    7 spinning roller pressure

    Due to the low roller pressure and the weak control force of the drafting jaws on the fibers, the fibers in the whiskers can not be well controlled, resulting in the phenomenon that the drafting can not be opened. With the increase of roller pressure, the friction boundary of the drafting jaw increases, so that the fibers in the sliver can be well controlled for normal drafting. The pressure of the front, middle and back of the cradle should be reasonably distributed to avoid the phenomenon of draft failure in the rear area.

    8 spinning roller

    For the new Cots with coating layer on the surface, the surface coating is thicker, the surface holding force of COTS is greatly weakened, the slippage rate of COTS is higher in the drafting process, so that the yarn can not be effectively controlled, and the yarn is easy to get out of the hard end. On the other hand, the coating layer on the surface of the old cots is thin, the friction coefficient of the cots is larger, the gripping force of the cots on the sliver is greater than the drawing force of the sliver, and the sliver can have normal drafting. Because there is no chemical treatment on the surface of the untreated cot, the cot surface can directly contact with the whiskers, with large friction coefficient, large gripping force, and can overcome the large stretching force, which is an effective measure to solve the problem of draft failure. In winter, because of the low temperature, the leather roller is hard and slippery, so it is easy to get hard head.

    9 raw material status

    In daily production, the raw materials are always in a state of change. The fiber quality length in sliver is lengthened (such as increasing combed sliver content) or the length uniformity is good. The friction coefficient between the fibers in the sliver becomes larger, and the tensile force response increases during the drafting process It is necessary to adjust the other process if the normal draft can not be opened.

    10 temperature and humidity

    When the humidity in the workshop increases, the friction coefficient between the fibers in the sliver increases and the friction resistance response increases, which increases the stretching force of the sliver. Under the condition of the same spinning process, the drafting jaws can not effectively control the fibers in the sliver, resulting in the phenomenon that the drafting cannot be opened. The workshop should reasonably control the temperature and humidity according to the seasonal changes, raw material conditions and other factors to ensure normal production and avoid the phenomenon of non opening draft.

    label

    0

    Service support telephone: 138-1667-2429

    Address: Science and Technology Innovation Park, Siming Town, Sheyang County

    wechat number


    分享到

    日韩经典三级_99re欧美_亚洲男人无码_无码国产在线第一页