Explore The Manufacturing Process Of Calcium Carbonate In Polypropylene Spunbond Non Woven Fabric

In recent years, calcium carbonate-based filling masterbatch has been used in the production of plastics and non-woven fabrics, which has made non-woven enterprises all over the country develop rapidly, business is booming, and competition is fierce.
The important reason for the rapid development of Polypropylene spunbond non woven fabric is its simple and fast manufacturing method, low product cost, stable quality and strong market competitiveness. In order to reduce the amount of polypropylene and reduce carbon dioxide emissions, producers will also add calcium carbonate filler masterbatch in the production process to give it more advantages in terms of price, processing process, production cost, and physical indicators. From this point of view, the application field and sustainable development of PP spunbond non-woven fabrics have been greatly expanded. Energy saving and emission reduction is an inevitable trend in the development of the Polypropylene spunbond non woven fabric industry.

1. Manufacturing process of calcium carbonate in Polypropylene spunbond non woven fabric

The raw material used in the production of Polypropylene spunbond non woven fabric is high melting index polypropylene, which is evenly mixed with calcium carbonate filling masterbatch, and then enters the screw extruder from the hopper to extrude and melt, and then enters the continuous pre-filter, and then enters the spinning box. . The melt enters the spinning head through the metering pump, and is accurately metered by the metering pump, and the melt is quantitatively transported to the spinneret, and a continuous melt stream, namely the primary fiber, is formed through the spinneret hole. The spun fibers are then cooled by quench air and drawn by air to form filament bundles. The filament bundle is oscillated back and forth by the oscillating roller, and is evenly laid on the running web forming curtain to form a fiber web.

2. Why choose calcium carbonate as filler masterbatch?

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

Therefore, in the production process of non-woven fabrics, calcium carbonate is generally selected as the main filler, and a little advanced soil or wollastonite is appropriately added in the production process to increase dispersibility and transparency. Generally, the mesh number of calcium carbonate is more than 1500 mesh, and it cannot be too fine, because the price of too fine mesh is high, and the ultrafine powder is generally not dispersed.

3. Filling method of filler

Without changing the production equipment and production process conditions, the filler is added in the hopper of the color masterbatch, but the addition ratio will also be limited. Some manufacturers add a larger hopper and feeder to deliberately add filler. In this way, the maximum amount of pellets added is about 20%, and the powder is about 8%. But now some manufacturers add one or several mixers to mix the materials evenly and then manually throw them into the hopper, which is relatively uniform. The addition ratio is as high as 30%, and the powder can also reach about 15%. Some manufacturers suck it into the hopper after stirring evenly, and the degree of uniformity is relatively poor, but it can also be added to 20% to 30%.

Since the filler masterbatch reduces the cost, the higher the filler concentration in the filler masterbatch, the lower the cost, and the user adds less. Conversely, the lower the concentration, the higher the cost, and the more users add. And the production of functional masterbatch can