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I often see the comparison between polypropylene BCF yarn and polyester carpet yarn, so which one is more cost-effective?

In terms of hand feel, polyester is better than polypropylene carpet yarn, but polypropylene has better wear resistance than polyester. Now  polypropylene BCF yarn  are used more on carpets because of their light texture, low price, and resistance to friction. Easy to take care of, especially compared to polyester carpets. The key to the best carpet is to take care of it.

Therefore,  polypropylene BCF yarn  and polyester carpet yarn have their own merits, and cannot be generalized. The key is to see which aspect of the requirement is more important.