In the flat yarn production, there are mainly three types of filled masterbatch, one is a calcium carbonate masterbatch with a polyethylene carrier, and the other is a calcium carbonate masterbatch with a polypropylene carrier. There is also an unsupported calcium carbonate masterbatch having a calcium carbonate particle size between 270 mesh and 1250 mesh.
The higher the fineness of the calcium carbonate in the masterbatch, the smaller the influence on the tension of the flat yarn, the less the dust and the brightness. How can we distinguish the fineness of the powder in the masterbatch? The main thing is to see and touch. Our eyes can generally see particles below 400 to 500 mesh. It can be difficult to distinguish between 500 and over. In production, if you see calcium carbonate particles from the side, it means that you use about 400 meshes of masterbatch. When we touch it with our hands, there will be a feeling of rubbing hands. If the masterbatch fineness is relatively large, the calcium carbonate particles with larger particle diameters will be separated out during stretching of the flat yarns. Generally, a single particle size larger than 22 μm will be easily peeled off. Therefore, the finer the calcium powder used for masterbatch, the better.
Of course, the carrier masterbatch is definitely easier to use than without the carrier. What is the difference between the polyethylene-based masterbatch and the polypropylene-based masterbatch? The difference is yes, but we sometimes do not pay attention, this is caused by the characteristics of polypropylene and polyethylene, polyethylene stretch law is good, and polypropylene pull force is good if we produce tons of flat wire plus some polyethylene as carrier The masterbatch is better, but the amount added should not be too large. It improves the tensile law and also reduces the pulling force.
In the case of a normal woven bag, a masterbatch of a polypropylene carrier is preferred. We know that polypropylene is used as a raw material for woven bags. If polyethylene is added, flat yarns tend to shrink and bend, causing the woven bags to have poor flatness and large shrinkage. There is a bigger reason that I do not support the use of polyethylene as a carrier for masterbatches. We know that the shrinkage laws of polypropylene and polyethylene are different. In production, the film extruded from the die is cooled. In the water tank, due to the different shrinkage laws, the film surface has a concavo-convex texture, and the cloth surface becomes rough, which causes a phenomenon that the cloth in the production has a large amount of water.
In the drawing production, we always found that there is a lot of foam in the cooling water. We must think that this is the calcium powder in the masterbatch. In fact, it is not. This is a low-molecular substance that is decomposed by heating the plastic raw materials, which is vaporized into smoke and attached to the surface of the cloth. After entering the water, it condenses into a waxy shape. Since the fabric is smooth, it floats on the surface of the water. However, if a polyethylene carrier masterbatch is used, the cloth surface will have fine concavo-convex veins and stripes, and some low-molecular waxes that have just condensed on the water surface. Also taken away, these waxes will remain on the surface of the flat yarn, and it is difficult to separate them from the surface of the flat yarn. When the peritoneum of the woven bag is punctured, there is a phenomenon of dragging and the peritoneum is not good. Cause unnecessary losses.
In the production of woven bags, reasonable addition of masterbatch can reduce costs and improve quality.
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