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DIFFERENCE BETWEEN SISAL & PP BALER TWINE

Posted Sep 26, 2017 by Alan Xu

Choosing the right baler twine is critical to a successful hay baling. Currently in the market, there are sisal twine and polypropylene twine to choose from. Today T&H Packaging is going to discuss their differences on several aspects.

In terms of tensile strength, apparently polypropylene twine can be much stronger than the sisal one. With approximately an ultimate tensile strength of 270 MPA, it has 100% more tensile strength than that of sisal twine which has an ultimate tensile strength of 100 MPA.

Besides, the two twines broke differently, however. Polypropylene twine had a straight break, where all of its fibers broke at once; this resulted in the straight line dropping to zero on the graph. The sisal twine broke in a different fashion. As the force load increased on the twine sample, individual fibers that were carrying the load broke and new ones became engaged. These properties directly correlate to the strength properties. Because all the fibers are engaged at once in polypropylene, it gives the twine high strength; the downside is that all the fibers break at once. Because only certain fibers in sisal twine carry the force of the load at one time, it doesn’t have as high of a strength as polypropylene twine. It does, however, allow the twine to stay intact much longer as each new fiber becomes engaged.

Price is another reason why people prefer polypropylene twine more. Sisal twine price is going up in the recent years, which is not as cost effective as the polypropylene twine any more. Polypropylene is industrial product which can have a lower price because of the mass production. By using polypropylene twine famers can have a better profit with the yield they have.

As for the environmental impact, sisal twine is more environmental friendly. Sisal twine is biodegradable, you don’t have to take all the trouble to dispose the twine. Whereas the polypropylene twine will not go away itself, in order to meet the environmental standards, you will need to get someone to recycle the twine. However, there are also some degradable polypropylene twine, which is great. But it can’t stay too long under the sun because of the lack of UV protection.

There is another reason why some people still stick to sisal twine. During the use of polypropylene twine, the knotter of the baler can be damaged by the twine in a much more accelerated pace than the sisal twine. For those who just do baling for personal use would prefer sisal twine, but for those who do commercial baling, they will just ignore the knotter damage and go straight with the polypropylene twine in order to get a heavier bale.