Polypropylene, short for PP is a flexible resin polymer. PP is the main raw material of non woven fabric which is manufactured by non woven machine. Polypropylene making steps are simple. It refers to extrusion, chemical process and heat dealing. It is a perfect material of non woven cloth which performs well on appearance, feel and quality. The unique properties have made it irreplaceable in non woven fabric production.
What is Polypropylene
Polypropylene is a synthetic thermoplastic polymer which is extracted from oil and natural gas. Gas propylene was not a useful material of oil and natural gas facilities until the Italian scientist polymerized the gas propylene in late 1950’s. Then polypropylene is machined into melt by extruding. The melt comes through the spinneret which creates the shape and length of filaments. After cooling down, they are spun together by web formation and heat rolling. The polypropylene is finally made into non woven fabric.
Types of Polypropylene
Polypropylene is divided into two main types in the market, homopolymer and copolymer.
Polypropylene homopolymer is a general-purpose grade. Most people favor this type. It is a semi-crystalline solid form, containing only propylene homopolymer. Propylene has a high ratio of strength-to-weight. It’s stiffer and stronger than the copolymer. Homopolymer is an ideal material in many corrosion resistant products as it’s of good chemical resistance and weldability. It’s also widely applied in package, non woven fabric, pipes, and automotive.
Compared with homopolymer, polypropylene copolymer is a little softer. It’s tougher and more durable. So it has a better performance on impact strength. Copolymer is not easily cracked and it’s very tough even in a lower temperature. Polypropylene copolymer is separated into random copolymers and block copolymers according to the ratio of propene and ethane.
Propylene random copolymer
It is manufactured by polymerizing ethane and propene. The ethane ratio is usually up to 6%, incorporated into polypropylene randomly. These polymers are especially flexible and clear. So they are decent materials for those products which request transparent appearance.
Propylene block copolymer
Ethene content in propylene block copolymer ranges from 5% to 15%. The co-monomer units are arranged in a regular pattern. The regular pattern makes the thermoplastic tougher and less brittle than the random co-polymer. Propylene block copolymer is suitable for industrial products which request high strength.
Polypropylene Non Woven Fabric Advantages
PP non woven fabric is durable. It’s resistant to wear and tear. So this fabric is popular in upholstery industry.
PP non woven fabric is not prone to getting dirty. It can withstand repeated and prolonged use.
It has the lowest thermal conductivity in all synthetic or natural fibers. This makes it an decent insulator
Polypropylene fabric is resistant to sunlight. It is also resistant to color fade when dyed.
Polypropylene fabric is not highly flammable. It comes flame-retardant when putting in special additives.
The last but not least property is that PP non woven fabric is resistant to water.
Is Polypropylene toxic
People usually consider polypropylene is a safe material. It is a heat-resistant plastic. The tolerant temperature reaches as high as 100℃. PP products are also approved to use for food and beverage storage.
How do additives help improve PP properties
PP non woven fabric comes with white color. This can’t meet the market’s demand. More and more people request multi-color for beautiful products. So masterbatch is added into polypropylene to color the finished products.
Polypropylene is a flammable polymer as it’s based on carbon. It’s a natural reaction that carbon materials burn with atmospheric oxygen. In some countries, textiles are requested fireproof. So flame retardants are added into polypropylene when making non woven fabric.
Non woven fabric has the usage lifespan. Heat and light will advance the ageing process. So anti-ageing additives are very necessary for those products which require a long service cycle.
Lubricants are often added to polymers. Lubricants can prevent the polymer from adhering to processing equipment. It allows a better flow of the polymer compound.
Reclaimed material is frequently used to combine with thermoplastic materials. Recycled PP nonwoven is extruded into melt by extruding machine. The process is almost same as feeding raw material PP.
Feeding raw material and additives is the first step in non woven fabric making. It decides the type and quality of the fabric. We must be clear about all details. Our company is an experienced manufacturer of non woven machine and non woven fabric. We will inform our customers the complete process of non woven producing operation. This ensures to meet high quality demand of end consumers.