When the car is cold and the ambient temperature is too low, it is easy to have problems with the whiskers not being stretched. The reason is related to the temperature inside the whiskers. Under low temperature conditions, the fibers in the whiskers become hard, the heat and moisture exchange between the rubber roller and the environment is affected, and the drafting resistance increases. The fiber bundles in the fiber whiskers are prone to collective speed changes, and the drafting force and control force are unbalanced, resulting in whiskers. The strips cannot be stretched, which affects production and quality.
The reason why the whiskers cannot be stretched out under low temperature conditions
The whiskers cannot be stretched out The main reason: the drafting process is too concentrated, the drafting force is unstable, and the holding force cannot be controlled, resulting in the inability to stretch the whiskers. The main factors affecting drafting failure are the combination of process and temperature and humidity. The problem of unable to draft the sliver is not obvious in the sliver and combing processes, but is more prominent in the drawing, roving and spinning processes. The main reasons why the whiskers cannot be drafted in a low temperature environment are: ① The imbalance between the guiding force and the control force movement between fibers; ② The main reason why the draft cannot be stretched due to the cooperation of the process is the imbalance of the drafting force and the holding force. The similarity between the two is that they cannot be stretched, but the difference is that the nature and scope of the stretch are different. The connection between the two: The movement between fibers has a more important influence on the moisture regain and moisture absorption and desorption. The reason why drafting cannot be caused by moisture absorption and release between fibers has a certain relationship with the number of fibers in the sliver.
The impact of low temperature conditions on the inability to stretch the whiskers
Generally below 22 ℃ Under low temperature conditions, it is easy to have the problem that the rubber roller cannot stretch the whiskers. Its manifestation is that the draft cannot be opened and hard ends are continuously produced, which affects the evenness and causes yarn defects, which are mainly concentrated in drawing, roving, spinning and other processes. In the drawing process, the fibers generally change speed collectively, and the hooks are reversed, causing large-area occasional yarn defects; in the roving process, the fibers change speed collectively, and hard ends appear, causing large-area yarn defects in the subsequent processes; in the spinning process, There will be problems such as no hard ends being produced during drafting. At the same time, the evenness will deteriorate, end breaks will increase, and production cannot continue. The above is the inability of the rubber roller to adapt to the temperature and humidity environment, resulting in inability to stretch the whiskers and poor drafting. Poor drafting is the initial cause of poor drafting, and poor drafting is the result of poor drafting. Poor drafting runs through all processes of rubber roller drafting, and poor drafting is concentrated in the drawing, roving, and spinning processes. Poor drafting often occurs at drafts below 5 times, while poor drafting often occurs at drafts above 5 times. </p
