needle punch nonwoven fabric manufacturers
needle punch nonwoven fabric manufacturers
If the methyl is disorderly arranged on both sides of the molecular backbone, it is called atactic polypropylene. Due to crystallization, the PP shrinkage is quite high, typically 1. PP has no problem of environmental stress cracking. When the methyl groups are alternately arranged on both sides of the molecular chain, they are called syndiotactic polypropylene, low gloss and low rigidity, but they have stronger impact strength.
needle punch nonwoven fabric manufacturers
The impact strength of PP is
related to ethylene content. The increase increases. PP has a Vicat
softening temperature of 150°C and is the lightest universal plastic.
The disadvantage is poor low temperature impact resistance. Due to the
highly structured structure, the melting point can be as high as 167°C.
The melt flow rate (MFR) of PP is usually from 1 to 100. PP materials
with low MFR have better impact resistance but lower strength. For the
same MFR material.
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