The Siro spinning method has been used by many factories and has been used for a long time. Recently, many factories have reported that the strands are sucked away during siro spinning. This is a common problem and a key issue that restricts the quality of Siro spinning. Only by effectively solving this management difficulty can the normal production of Siro spinning be achieved. This difficulty is the key to restricting the quality and efficiency of Siro spinning.
01 The reason why Siro spinning whiskers are sucked away
Siro spinning is two rovings spun on the same spindle. At the exit of the front roller, the two slivers form a triangular twist. There are seven problems (or factors) in this triangular twist:
The size of the triangle is related to the width of the two whiskers;
There are two factors that determine the width of the two strands, one is the center width of the bell mouth, and the other is the roving weight.
The larger the center distance of the bell mouth, the wider the center distance between the whiskers; the heavier the roving weight, the wider the center distance between the whiskers. On the contrary, the narrower it is.
Two whiskers with the same quantity form an isosceles triangle;
When the two strands have inconsistent rations, the one with the heavier ration will have a shorter triangular length, and the one with the lighter ration will have a longer triangular length;
When the Siro condition is determined, the vertical length of the front roller holding nip line and the twisting point remains unchanged;
The direction of the twist angle of the Siro yarn during Z twisting is in the same direction as the right stripe, and the twist is less along the length of the triangle area; in the opposite direction to the left stripe, the angles are superimposed, and the twist is more along the length of the triangle area; in normal In the case of an isosceles triangle, the right side has more whiskers in the core of the yarn, and the left side has more whiskers outside the yarn.
Due to the twist angle of the yarn, during Z twisting: when the right side bar is light, the left triangle length is short, and the left side bar covers the right side bar; when the left side bar is light, the right side bar is The length of the side triangle is short, and the left whisker wraps around the right whisker (see picture) (the red one is thin, the white one is thick, the upper one is thin on the left side, and the left side wraps around the right side; the lower one is thin on the right side) , the left side covers the right side.)
02 Sirotex’s equipment requirements
Due to the special requirements of siro spinning, the weighting arm needs to be pressurized appropriately, and on the premise of maintaining the holding force, it should be small. For rollers, excessive polishing cannot be done in order to eliminate mechanical waves caused by mechanical processing defects. The mirror surface formed by the old-fashioned polishing rollers adsorbs the fibers, which is one of the reasons for the running of Siro spinning strips. In order to solve the problem of sero spinning strips, the newly developed roller surface treatment process uses chemical treatment, does not require polishing, has better roller holding power, and can be completely free of mechanical waves.
03 Sirospun’s process requirements
Mastering the width of the bell mouth is the balance between the siro effect and yarn breakage. In actual production, Siro is used to improve single yarn strength and reduce hairiness. The detail caused by running strips increases and the dry CV worsens. Therefore, the four indicators of single strength, hairiness, consistency, and details must be considered as a whole.
The control of roving quantity must be highly stable. Therefore, it is necessary to strictly control the uneven weight of the final yarn and the elongation of the roving. On the basis of ensuring supply, the roving quantity is controlled to be light to reduce the strips from running due to edge delamination.
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