Color difference refers to the presence of the same batch of PP BCF yarn, in the inspection and use of the process, with the naked eye can see the color difference. Including between the segment and the section, between the tube and the tube, between the layers and the color change.

PP BCF yarn, the process of forming the color difference during the spinning process and the control method

(A) do a good job into the factory masterbatch screening

The masterbatch for spinning is made by mixing and blending the pigment and polypropylene chips. The uniformity of the mixture and the uniformity of the particle size affect the homogeneity of the spinning masterbatch into the system. To this end, into the factory masterbatch to be visual inspection and test spinning test to ensure that the quality of masterbatch meet the requirements. I plant masterbatch by the workshop technician personally test, test.

(B) granulation in strict accordance with the implementation process

The workshop first consider the measurement system feeding uneven, but consider a single high-concentration masterbatch direct use did not find this problem, it is inferred that several kinds of masterbatch may be mixed with uneven, for the small amount of added masterbatch, the masterbatch Particle size is certain, the less the amount of added, the greater the error, the final appearance of the filament color. So the key to the problem is to mix even and dilute the concentration of masterbatch, the measures taken is the need for several kinds of masterbatch with color and low concentration to join the masterbatch, to carry out masterbatch recycling, the method is:

The original masterbatch and polypropylene slices in proportion to mix, through the granulator melt mixing, cooling, granulation, the formation of recycled masterbatch, used in spinning, color difference to improve, but sometimes there are pieces of Color difference. Further analysis of the reasons, may be the difference between the proportion of masterbatch and slice, the ratio of masterbatch, mixed into the initial proportion of slightly higher, recycling into the extruder before and after the density of high, re-produced before and after the masterbatch color.

(C) the measurement system regularly check the calibration and weighing the sensor linear inspection

The stability of the measurement system will play a crucial role in the generation of color difference. If the measurement system weighing error is large, the masterbatch ratio of the extruder is not allowed, and a large number of serious chromatic aberration will occur. How to do the maintenance of metering system?

1, metering system alarm, immediately stop processing, after 10 minutes before and after the filament isolation test, to enter the next process.

2, the regular measurement of the measurement system.

(D) to strengthen the production of similar color control

1, in the arrangement of production plans, similar to the color as far as possible not to produce and continuous production, to prevent mixed batch and mixed package.

2, if the similar color must be produced at the same time, do a good job marking and isolation area storage, the implementation of a separate post-processing and packaging.

3, in the post-processing twist, take the yarn on the yarn must be checked after the batch number processing.

(5) do the quality of spinning process monitoring

1, the operator on time inspection, do a good job of operation records, at any time control technology alone, found that the process parameters exceeded the equipment and abnormal, timely contact with technical staff, and do product isolation and traceability.

2, timely treatment of poor suction material, to avoid poor suction caused by discoloration.

3, at any time to check the draft roller wrapped around the wire and found that winding wire in a timely manner clean, especially in the head when the draft roller to do the clean, to prevent the yarn caused by uneven heating caused by uneven light color.

(6) coloring control during twisting

After the same yarn with different twist stereotypes test, we found the same color, twist different, its stereotypes, the color appears color, so do twisting machine twist monitoring is also very important.

1, the use of flash tachometer every day to do a good job spindle speed monitoring, deviation control in 5%; excessive stop, find equipment maintenance personnel.

2, blockers at any time inspection and found that the formation of bad, tight twist, poor parts of the process and from the original position, to stop processing, or repair machine processing, the cylinder yarn isolation test.

3, after twisting, do the car logo and regional storage, to prevent the mixed batch when the stereotypes.

(Seven) filament stereotypes color control

1, set the temperature set at 148-152 ℃, the temperature should not be too high, otherwise, some filaments encounter high temperature will change color.

2, the positioning room to stay in control time within 2 minutes, and some filaments in the oven for a long time will change color.

3, the pressure control in the 1.2-1.5bar, the size of the pressure directly affect the temperature changes in the stereotypes, the same will cause color changes.

Changzhou LingDa Special Fiber Co., Ltd. / Changzhou LingDa Chemicals Co., Ltd. Main Products: PP BCF yarn, polypropylene bulked yarn, polyester BCF yarn, polyester texturized yarn, nylon BCF yarn, nylon texturized yarn, SORONA, Sorona, carpet adhesive , polypropylene oil, perfluoro telomer intermediate.