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Manufacturing process of calcium carbonate in PP spunbond non-woven fabric
by：Sunshine
2021-04-05
In recent years, calcium carbonate-based filler masterbatches have been widely used in the production of plastics and non-woven fabrics. In a short period of time, non-woven fabric enterprises across the country have developed rapidly, business is booming, and competition is fierce.
The important reason for the rapid development of PP spunbond non-woven fabric is its simple and quick manufacturing method, low product cost, stable quality and strong market competitiveness. In order to reduce the amount of polypropylene used and 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, production costs, and physical indicators. From this point of view, the application field and sustainable development of PP spunbond nonwovens have been greatly expanded. Energy saving and emission reduction is an inevitable trend in the development of the spunbond nonwovens industry.
The manufacturing process of calcium carbonate in PP spunbond non-woven fabric
The raw material used in the production of spunbond non-woven fabrics is high-melt index polypropylene, which is evenly mixed with calcium carbonate filler masterbatch, and enters the screw extruder from the hopper to be extruded and melted.丝箱体。 Silk box.
The melt enters the spinning head through the metering pump, and the metering pump accurately measures the melt to quantitatively transport the melt to the spinneret, and form a continuous stream of melt through the spinneret holes, that is, the nascent fiber.
The nascent fiber is then cooled by quenching air and drawn by air flow to form filament bundles. The filament bundle is reciprocally oscillated by the oscillating roller, and evenly laid on the running netting curtain to form a fiber web.
Why choose calcium carbonate as filler masterbatch?
Calcium carbonate is an extremely important inorganic chemical product, which is widely used in plastics, rubber, coatings, papermaking and other industries. The characteristics of several fillers commonly used in the industry are as follows:
Calcium carbonate: The purpose of adding filler masterbatch to spunbond non-woven fabric is to reduce cost. From the experience of plastic resin modification function and cost reduction, it is the cheapest and easy to obtain, and the appearance is white and odorless. powder. The relative density is 2.71, the refractive index is 1.65, and the Mohs hardness is 3.
Old age soil: easy to disperse, relatively more expensive than calcium carbonate, white in appearance, relative density of 2.6, and refractive index of 1.56.
Talc powder: easy to disperse, has a certain degree of lubricity to the equipment during processing, it is a white powder with solid crystals. The density is between 2.7 and 2.8, and the price is relatively expensive.
Mica powder: The relative whiteness is lower, because the 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: The relative density is 2.9, the refractive index is 1.63, and the Mohs hardness is 4.5. The biggest advantage is that it does not absorb moisture and has little effect on the color masterbatch.
Therefore, the filler used in the production of non-woven fabrics is generally calcium carbonate, and a little old clay or wollastonite should be added during the production process to increase dispersibility and transparency.
Generally, the calcium carbonate mesh should be more than 1500 meshes, and it should not be too fine, because too fine meshes are expensive, and ultra-fine powders generally cannot be dispersed.
Filling method of filler
Without changing the production equipment and production process conditions, the filler is added in the hopper of the masterbatch, but the addition ratio will also be limited.
Some manufacturers add a larger hopper and feeder to add fillers specially. In this way, the maximum amount of pellets added is about 20%, and the powder is about 8%.
And now some manufacturers add one or more mixers to mix these 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 stir evenly and then suck into the hopper, 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 proportion. Conversely, the lower the cost, the higher the concentration, and the more users add. And the production of functional masterbatch can not add filling masterbatch, so as not to affect its functionality.
The important reason for the rapid development of PP spunbond non-woven fabric is its simple and quick manufacturing method, low product cost, stable quality and strong market competitiveness. In order to reduce the amount of polypropylene used and 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, production costs, and physical indicators. From this point of view, the application field and sustainable development of PP spunbond nonwovens have been greatly expanded. Energy saving and emission reduction is an inevitable trend in the development of the spunbond nonwovens industry.
The manufacturing process of calcium carbonate in PP spunbond non-woven fabric
The raw material used in the production of spunbond non-woven fabrics is high-melt index polypropylene, which is evenly mixed with calcium carbonate filler masterbatch, and enters the screw extruder from the hopper to be extruded and melted.丝箱体。 Silk box.
The melt enters the spinning head through the metering pump, and the metering pump accurately measures the melt to quantitatively transport the melt to the spinneret, and form a continuous stream of melt through the spinneret holes, that is, the nascent fiber.
The nascent fiber is then cooled by quenching air and drawn by air flow to form filament bundles. The filament bundle is reciprocally oscillated by the oscillating roller, and evenly laid on the running netting curtain to form a fiber web.
Why choose calcium carbonate as filler masterbatch?
Calcium carbonate is an extremely important inorganic chemical product, which is widely used in plastics, rubber, coatings, papermaking and other industries. The characteristics of several fillers commonly used in the industry are as follows:
Calcium carbonate: The purpose of adding filler masterbatch to spunbond non-woven fabric is to reduce cost. From the experience of plastic resin modification function and cost reduction, it is the cheapest and easy to obtain, and the appearance is white and odorless. powder. The relative density is 2.71, the refractive index is 1.65, and the Mohs hardness is 3.
Old age soil: easy to disperse, relatively more expensive than calcium carbonate, white in appearance, relative density of 2.6, and refractive index of 1.56.
Talc powder: easy to disperse, has a certain degree of lubricity to the equipment during processing, it is a white powder with solid crystals. The density is between 2.7 and 2.8, and the price is relatively expensive.
Mica powder: The relative whiteness is lower, because the 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: The relative density is 2.9, the refractive index is 1.63, and the Mohs hardness is 4.5. The biggest advantage is that it does not absorb moisture and has little effect on the color masterbatch.
Therefore, the filler used in the production of non-woven fabrics is generally calcium carbonate, and a little old clay or wollastonite should be added during the production process to increase dispersibility and transparency.
Generally, the calcium carbonate mesh should be more than 1500 meshes, and it should not be too fine, because too fine meshes are expensive, and ultra-fine powders generally cannot be dispersed.
Filling method of filler
Without changing the production equipment and production process conditions, the filler is added in the hopper of the masterbatch, but the addition ratio will also be limited.
Some manufacturers add a larger hopper and feeder to add fillers specially. In this way, the maximum amount of pellets added is about 20%, and the powder is about 8%.
And now some manufacturers add one or more mixers to mix these 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 stir evenly and then suck into the hopper, 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 proportion. Conversely, the lower the cost, the higher the concentration, and the more users add. And the production of functional masterbatch can not add filling masterbatch, so as not to affect its functionality.
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