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 Post subject: ball material
PostPosted: 08 Nov 2019, 15:21 
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http://www.ittf.com/wp-content/uploads/ ... oD2018.pdf

Hmm.

Quote:
We need better materials, and manufacturers are still encouraged to search for these and
optimize them.


So most balls nowadays are ABS. I'm no materials expert, but I wonder what other materials could be experimented with, to create balls that have just as much or more spin than the current plastic balls.

1) Any thoughts regarding what other materials may be suitable? PLA?
2) Can anyone explain why plastic balls have less spin than cell? Surface roughness, elasticity, density etc?

Thanks


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 Post subject: Re: ball material
PostPosted: 08 Nov 2019, 17:37 
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SCIENCE OF MECHANICS TO ACCOUNT FOR THIS.

THE SLOTH AND THE SPEEDY.
As being an inquisitive engineer, I gathered a dozen of broken balls and measured thickness on the ball outer membrane. Balls with a thinner membrane proved to have more spin, as expected.
Table tennis is a wonderful sport where Natural Mechanics will govern all the play, and I happened to study the laws of Mechanics as a young engineer ages ago. Happy good times I missing that much.

Attachment:
Broken shell jpg.jpg
Broken shell jpg.jpg [ 15.62 KiB | Viewed 1397 times ]


Be happy.


Last edited by igorponger on 31 Jan 2022, 22:08, edited 2 times in total.

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 Post subject: Re: ball material
PostPosted: 08 Nov 2019, 19:19 
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ABS isn't just ABS. There are probably thousands of different ABS formulations. There's stuff you can add to the ABS - other polymers, plasticizers, etc. If there were only one type of ABS it wouldn't have taken so long to develop orange balls - they would have had to tweak the formula until they found one that worked. Whatever it is it's either a trade secret or it's been patented. And you can bet they continue to test new ones.

As to why less spin. The new balls are larger in diameter. And they're heavier. So 1) you get less RPM for a given tagential speed and 2) if you generate the same sideways force (via the Coanda effect) there is more mass to be acted upon. See if you can find some of the old 38mm balls, THAT was a huge change. Those balls would probably be uncontrollable with today's bats.

Iskandar


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 Post subject: Re: ball material
PostPosted: 08 Nov 2019, 20:20 
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iskandar taib wrote:
ABS isn't just ABS. There are probably thousands of different ABS formulations. There's stuff you can add to the ABS - other polymers, plasticizers, etc. If there were only one type of ABS it wouldn't have taken so long to develop orange balls - they would have had to tweak the formula until they found one that worked. Whatever it is it's either a trade secret or it's been patented. And you can bet they continue to test new ones.

As to why less spin. The new balls are larger in diameter. And they're heavier. So 1) you get less RPM for a given tagential speed and 2) if you generate the same sideways force (via the Coanda effect) there is more mass to be acted upon. See if you can find some of the old 38mm balls, THAT was a huge change. Those balls would probably be uncontrollable with today's bats.

Iskandar


Yes, Exactly,

The typical ABS formula for a variety of consumer goods is known to produce a resulting material with specific gravity of 1.10. Meanwile celluloid material for making table tennis balls since early 1900's is a high-density material of 1.40 -1.45. We now looking to produce a better ABS material with density of 1.35 at minimum. It is a tricky task though.


Last edited by igorponger on 31 Jan 2022, 22:35, edited 1 time in total.

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 Post subject: Re: ball material
PostPosted: 31 Jan 2022, 19:59 
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Blade: butterfly
FH: stiga calibra lt+
BH: butterfly tenergy 05
I am using tt ball by Koxtons mart for daily practice sessions and I am fully satisfied with the quality.


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