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PostPosted: 06 May 2020, 23:57 
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QiJi SUPER TACKY RUBBERS. SELF-REPRODUCING TACKINESS.
https://patents.google.com/patent/US2035698

A while ago, DF launched innovative product on market, Qi Li rubbers with three different sponges. Topsheet touch feels much like crude honey.
Osmosis Inverse technology did the whole trick as advertised by DF. Chinese manufacturer reasonably adopted the early invention by Dr. Harry Fisher of the year 1934, free of royalty fees since 1974.
Truth to say, no "inverse osmosis" effected there, but some nitrozo family added in raw rubber composition.

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It is self-reproducing tackiness, never to fade.


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PostPosted: 07 May 2020, 00:22 
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Blade: Palio TS3
FH: Galaxy Jupiter II
BH: DMS Störkraft 1,6 mm
I've tried that. It was not even tacky from the start, horrible rubber.

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PostPosted: 07 May 2020, 01:57 
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Would you eat "crude honey"? :lol: :lol: :lol:

That patent was filed in 1936. In the US. I don't believe for a minute anyone uses "nitroso compounds" to make their rubbers tacky, it's much more likely it's some sort of adhesive. Just another case of Igor setting himself up as a "pundit". He doesn't know any more than anyone else does but he'd like you to think so. :lol:

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PostPosted: 01 Jul 2020, 05:52 
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THREE SECRETS OF CHINESE STICKY RUBBER.

Actually, there are three known ways for producing table tennis rubber sheets with tacky surface.
Very specific technologies, unique technologies.

1) As is a common knowledge with all table tennis folks, tennis rubber must be durable and elastic to project the ball forcefully, and the smooth surface must be grippy to better spin the ball. In 1972, the Chinese invented a novelty rubber producing a really tacky feeling to the touch. And the Europeans can't make such rubber until now.
The most popular technology to produce stickiness of surface is the "incomplete vulcanization" effect. The whole mass of rubber is heated to 120*Celsius while the outer surface is only heated to 70*Celsius. Thus, the external part of rubber sheet (a thinnest layer of hundredths of a millimeter) retains similarity to raw rubber material, i.e. it is very sticky.
The disadvantage of this technology is obvious. The stickiness fades as the outer layer wears out. For example, Hurricane DHS rubbers.


2) 29-06-2020 12:20:00
Another Chinese rubber technology is using special rubber blends to which liquid chemicals of Nitrosamines are introduced. This method was first invented by the American engineer Henry Fischer in 1934.
Fischer's rubbers are easy to discern just by sniffing -- it would deliver a loud smell of rotten fish and the pimples inside would be as sticky as the outer surface of the sheet. The best pleasure you get with Fischer's rubber -- the grippiness is never to fade. Double Fish manufacturer of China is now employing Fischer's Formula in making many rubber products of their own.

3) and finally, the most ingenious Chinese technology is a two-layer topsheet, where the outer layer is made of sticky silicone. An innovation of dubious legality that does not comply with the ITTF rules at all. Just purchase a sample and tear off the outer laminate. See the photo.

PS // The old good wisdom is just in place here :
— No racket plays itself. A player does play with a racket in his hand.

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/Be happy/


@Translated from Russian by Google Engine.


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PostPosted: 02 Jul 2020, 02:31 
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Naah. In most cases they probably just apply glue to the rubber as the last stage of manufacturing. Though that old 999 rubber was probably under-vulcanized (which is why it melts after 3-4 years of not being used). If this "two layer" technology exists it's probably in 729 Bloom which remains tacky for months instead of losing it quickly like most other rubbers. I wonder where Igor finds this "information". Probably makes most of it up. He's been going on about this "nitroso" stuff for years now - at one time it was EVERYONE IN CHINA using nitroso compounds, not just Double Fish. He doesn't really know if Double Fish does or not, since he doesn't have access to the Double Fish factory any more than any one else does. He makes it up as he goes along.

Looks like someone took a blowtorch to that sheet of Big Dipper.

Iskandar


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PostPosted: 03 Jul 2020, 03:53 
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iskandar taib wrote:
Naah. In most cases they probably just apply glue to the rubber as the last stage of manufacturing. Though that old 999 rubber was probably under-vulcanized (which is why it melts after 3-4 years of not being used). If this "two layer" technology exists it's probably in 729 Bloom which remains tacky for months instead of losing it quickly like most other rubbers. I wonder where Igor finds this "information". Probably makes most of it up. He's been going on about this "nitroso" stuff for years now - at one time it was EVERYONE IN CHINA using nitroso compounds, not just Double Fish. He doesn't really know if Double Fish does or not, since he doesn't have access to the Double Fish factory any more than any one else does. He makes it up as he goes along.

Looks like someone took a blowtorch to that sheet of Big Dipper.

Iskandar
And you have also been going on about the "glue" for years, although for most of us it's obvious it's not glue and we have told you so. Your theory is no better than Igor's :)

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