中 
EN How can the unevenness of combed sliver be reduced?
Author:
Source:
Release date:
2019-12-17
(1) Appropriately adjust parameters such as the forward‑rotation timing of the separating rollers, the closing timing of the nippers, and the positioning of the cylinder; regulate the pressure applied to the separating and drafting rubber rollers; and properly set the width of the cotton‑collecting device between the separating rollers (on newer combing machines, this device’s width is adjustable) to enhance the quality of the separation‑joining process. If the fiber length and the feed length are relatively long, the forward‑rotation timing of the separating rollers should be advanced slightly, particularly during forward feeding. However, care must also be taken to avoid excessive interference with the rear‑row needle teeth of the cylinder on the trailing end of the cotton web inside the machine when the separating rollers’ reverse rotation is advanced. From the standpoint of improving separation‑joining quality and reducing strand unevenness, the nippers’ closing timing should not be set too early; otherwise, the nip opening becomes excessively wide, hindering the upward extension and straightening of the fiber tufts and thereby degrading the separation‑joining quality. At the same time, attention should be paid to how the timing of the nippers’ closure—whether advanced or delayed—affects the reliability of the nip’s grip on the cotton layer at the onset of cylinder carding. It is essential to carefully balance these interdependent and mutually influencing factors.
(2) Properly configure the drafting mechanism’s drafting process. After drafting, the unevenness of the sliver generally remains significant; if the drafting settings are inappropriate, this unevenness will be further exacerbated. Therefore, the drafting ratio, roller spacing, and pressure should be accurately adjusted according to parameters such as the combed sliver’s linear density, fiber length, and the drafting capacity of subsequent processes. On domestically produced new‑type combing machines, adopting a relatively higher combed sliver linear density (with a correspondingly lower drafting ratio) helps ensure sliver evenness and can also reduce the speed of the roving take‑up mechanism—practices that may serve as references for other machine models. The FA266 combing machine features an adjustable rear‑zone drafting system, enhancing adjustment flexibility and facilitating the rational optimization of process parameters to improve sliver evenness.
(3) Reasonably control the tension and drafting in each section. Since combed slivers are formed by the interconnection of individual fiber tufts, and the fibers exhibit a high degree of parallelism and straightness with poor cohesion among them, they are highly susceptible to unintended elongation. Therefore, provided that no sliver wrinkling occurs, the tension‑drafting should be kept as low as possible; after passing through the drafting mechanism, the tension‑drafting ratio is best maintained close to 1.
(4) Ensure that the cylinder and top comb are in good mechanical condition, with no fiber entanglement; keep the surfaces of the separating rubber rollers, drafting rubber rollers, and pressure rollers clean and smooth, and verify their free rotation. The passages through which the sliver passes must be kept clean and unobstructed to prevent damage to the sliver structure and unintended elongation.
Previous page
Previous page
Leave a Message Online
Please provide your contact information, and our sales team will reach out to you promptly to discuss your needs.
Related Information
2026/04/22
2026/04/22
2026/04/22
2026/04/22
Contact Us
Address: Chengnan Park, Economic and Technological Development Zone, Youxi County, Sanming City, Fujian Province
Fax: +86-598-6203777
Xinsen Technology
SPDB discounting
Credit Limit Calculation Request
Copyright © Fujian Xinsen Synthetic fiber Technology Co., Ltd.