Common Abnormalities and Cause Analysis of Warp Beam Dyeing Machine

1. Wood grain is produced during dyeing of long fiber, and wood grain like annual ring of wood will appear on the cloth surface during long fiber dyeing. The main reason for this abnormality is the high tension and uneven tension during rolling, resulting in uneven penetration of the dye solution. . In addition, due to the high density of the inner layer of the guide cloth, while the density of normal dyed cloth is relatively small, there will be abnormal wood grains. Channeling during dyeing is not only silk-like, but long-fiber fabrics with smooth fiber surfaces are also prone to channeling. The main reason for this phenomenon is that the initial tension is too small during winding, which causes the cloth to be too loose. Or the tie is not tight or disconnected after being rolled up. Improper control of the machine, improper adjustment when changing the large-circulation liquid volume adjustment valve, resulting in excessive water volume and increased pressure at the dye liquid injection port, causing slippage of the cloth surface and causing cloth channeling.

2. Side difference (side shallow)

When dyeing with a beam dyeing machine, the most prone to abnormality is the marginal difference. The main reason for this kind of abnormality is improper placement of the baffle in the reel. The function of the inner baffle is to cover the hole area of the inner reel that is not covered by the cloth layer, so that the dye solution will not run off at the cloth edge, which will cause dyeing failure. Before the cloth is rolled into the cylinder, the height of the cloth and the hole distance must be measured with a ruler, and the position of the baffle must be converted to reduce the edge difference. In addition, the dyeing temperature should generally be controlled below 25℃. If the dyeing temperature is too high, some of the dyes will be dyed instantaneously and unevenly, resulting in shallow edges.

3. Uneven dyeing

There are many reasons for uneven dyeing during the dyeing process. The main reasons are as follows: the acid is added too fast in the process of adjusting the pH value, and the amount of acid added at one time is too much. During the dyeing process, the heating rate is too fast, especially for light-colored and sensitive combinations of dyes. The heating rate during dyeing should not exceed 1.5°C/min. The above two points are mainly due to the uneven dyeing caused by too fast coloring in a short time. Incorrect placement of the inner baffle or looseness during the dyeing process will also cause uneven dyeing; incomplete desizing and imperfect pre-treatment are the main reasons for uneven dyeing.