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Water jet loom

2017-07-18 News

4 process settings

For the 10S-30S cotton yarn, for example, the basic selection, such as pump form, cylinder diameter, pump spring type, nozzle form, nozzle seat, needle size and so on are the same with the hydrophobic fiber yarn.

4.1 the first choice of water

The following are the same as the "

The weft weft is bent in the head of the nozzle. The purpose of the first water is to straighten the weft before the gripper is opened and observe the amount of the first water near the end of the free flight. At this time, the amount of water in advance is the least Water to ensure that the weft head straight for the best. Cotton yarn in the process of watering weft because of its large water content, not easy to produce reverse, the use of medium first to meet the requirements of water.

The following are the same as the "

4.2 setting of flight angle

The following are the same as the "

The strength of cotton yarn is generally lower than that of hydrophobic fiber yarn. Choose a larger flying angle is more suitable for the characteristics of cotton yarn. Can effectively reduce the weft of the loom fault. The time of the start of the jet is determined by the relative position of the actual injection and the reed, and the flying angle of the weft is about 165 ° when the jet head rests with the reed and the flight restraint time is adjusted to 5 mm ahead of the reed center.

The following are the same as the "

4.3 Constraints of flight time settings

The following are the same as the "

Weft flight is divided into two stages: first by the length of the device stored part of the weft first fly out of the "free flight", and then edge of the long side of the flight of the "constrained flight." "Free flight" starts from the gripper opening, and the yarn stored on the drum is momentarily terminated. The flight speed depends on the velocity of the jet stream and the friction factor between the weft and the water flow. The weft flying speed Relatively high, in the 150cm width, 600r / min under the weaving conditions, weft average flight speed of more than 40m / s; "bound flight" angle can be adjusted according to the fabric weaving requirements, is the free flight to the gripper closed , The speed of its flight depends on the weft length of the weft, the speed is only "free flight" when about 45%. This combination of "free flight" and "bound flight" is particularly important in cotton weaving. The strength of the cotton yarn is low, and if the weft is directly from the higher speed of the "free flight" to the speed at which the gripper is closed, a greater tension will be applied to the weft yarn, causing the weft yarn breakage in the weft insertion shed. The combination of "free flight" and "bound flight", in the weft insertion process, the speed of the weft flying from the "free flight" when the higher speed down to "constrained flight" when the speed, and then this lower The speed of the transition to the speed of the gripper is 0, so that the tension applied to the weft is relatively moderate, and the phenomenon that the weft tension is too large and the weft is caused by the closing of the gripper.

The same time as the above-

4.4 Determination of residual water

The following are the same as the "

From the nozzle jet flow to the end of the warp yarn, weft yarn to maintain the appropriate tension, in order to ensure the normal weaving, then the tension to maintain the residual water to complete. Cotton yarn moisture content, the general residual water can meet the requirements. The amount of residual water can be visually judged by the stroboscope.