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Yuan Lei's Little Knowledge | Process Application of Calcium Carbonate Filler Masterbatch in Non-woven Fabric

Release time:

2024-01-29 09:34

Manufacturing Process of Calcium Carbonate in PP Spunbond Non-woven Fabric

The raw material used in the production of PP spunbond non-woven fabrics is high melting index polypropylene, which is evenly mixed with calcium carbonate filling masterbatch, and then enters the continuous pre-filter after being extruded and melted by the hopper into the screw extruder, and then enters the spinning box. The melt enters the spinning head through the metering pump, and the melt is transported to the spinneret quantitatively by the metering pump, and a continuous melt trickle is formed through the spinning hole, I .e., the primary fiber. The as-spun fibers are then cooled by a quench air and drawn to form a filament bundle. The filament bundle is swung back and forth by the swing roller, and is evenly laid on the running screen curtain to form a fiber web.

 

 

Why choose calcium carbonate to do filling masterbatch?

Calcium carbonate is an extremely important inorganic chemical product, which is widely used in plastics, rubber, paint, paper and other industries. The characteristics of several fillers commonly used in industry are as follows:

Calcium carbonate: the purpose of adding filler masterbatch in spunbond non-woven fabric is to reduce the cost. From the experience of plastic resin modification function and cost reduction, the most cheap and easy to obtain, the appearance is white and tasteless powder. The relative density is 2.71, the refractive index is 1.65, and the Mohs hardness is 3.

Aged soil: easy to disperse, the price is relatively higher than calcium carbonate, the appearance is white, the relative density is 2.6, the refractive index is 1.56.

Talc powder: easy to disperse, the processing of equipment has a certain lubricity, with solid crystalline white powder. Want to density between 2.7~2.8, and the price is relatively expensive.

Mica powder: the relative whiteness is lower, because mica powder is non-toxic and can be used in food contact products, the relative density is between 2.8 and 3.0, the refractive index is 1.59, and the Mohs hardness is 3.

Wollastonite: 2.9 relative density, 1.63 refractive index, Mohs hardness 4.5, the biggest advantage is not hygroscopic, and the color masterbatch has little effect.

Therefore, the general selection of fillers in the production process of non-woven fabrics are generally based on calcium carbonate, and the appropriate addition of a little high-age soil or wollastonite to increase the dispersion and transparency in the production process. Generally, the mesh number of calcium carbonate is above 1500 mesh, and it cannot be too fine, because the price of too fine mesh number is high, and ultrafine powder is generally not dispersed.

 

Filling method of filling material

Without changing the production equipment and production process conditions, the filler is added in the hopper of the masterbatch, but the addition ratio will be limited.

Since the filling of the masterbatch reduces the cost, the higher the filler concentration in the masterbatch, the lower the cost, and the smaller the addition ratio. On the contrary, the higher the concentration, the higher the cost, and the more the addition ratio. And the production of functional masterbatch can not be filled with masterbatch, so as not to affect its functionality.

Filling, calcium carbonate, relative, density, general, production, non-woven, entering, adding

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