In order to control the color difference of the spunbonded nonwoven fabric within a certain range, the following matters concerning the non-woven masterbatch cannot be ignored:

1. The amount of non-woven masterbatch added: The amount of masterbatch added directly affects the spinning process and the dyeing effect of the product. The amount of addition is small, the dyeing depth is insufficient or the dyeing is uneven, and the amount of addition is too large, which will form artificial impurities and increase the difficulty of spinning. At the same time, since the melting point of the masterbatch is lower than that of the conventional slice, the gray scale is high, so that the melt viscosity changes, the spinnability deteriorates, and the tensile property of the yarn decreases. Practice has shown that when the amount is between 1.2% and 3.6%, the finished product is dyed well and the spinning property is good.

2, the mixing position of the non-woven masterbatch: after the masterbatch is different from the quality index of the conventional slice, in order to reduce the thermal decomposition of the masterbatch, the qualified manufacturer, the heating and melting of the masterbatch should be used alone. A special small screw is inserted into the melt filter by direct mixing with the melt in the large screw through the metering device.

3, other aspects: In order to reduce the color difference of the finished product, we must pay attention to the following links in production. (1) Establish a standard sample of each masterbatch in a certain ratio, and perform proofing test on the masterbatch after mixing in the factory according to the ratio of the standard sample, and compare it with the standard sample; (2) Entering the factory Mix the masterbatch of the same variety and the same batch, and mix the masterbatch of the same variety and different batches; (3) Before the masterbatch enters the screw, try to remove the masterbatch with too large and too small particles. Granules to ensure that they melt evenly and completely in the screw; (4) Try not to change the masterbatch lot number in the middle of producing a color number.

Color difference is a common phenomenon in the production of non-ferrous spunbonded polypropylene nonwoven fabric. The reasonable selection of the masterbatch composition and the correct process control can control the color difference to a reasonable extent to a large extent and improve the quality of the product.