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PostPosted: 28 Jan 2017, 22:20 
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There are MUCH stronger contact cements than rubber cement or table tennis water based glues. Not difficult to find, either. Anything used to attach Formica or to repair shoes would qualify. Even these are weaker than whatever Butterfly uses to attach topsheets.

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PostPosted: 28 Jan 2017, 22:52 
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I guess the secret to glueing a top-sheet onto the sponge is temperature. I guess you'll need an oven or at least an iron to remove them efficiently.

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PostPosted: 29 Jan 2017, 01:25 
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iskandar taib wrote:
There are MUCH stronger contact cements than rubber cement or table tennis water based glues. Not difficult to find, either. Anything used to attach Formica or to repair shoes would qualify. Even these are weaker than whatever Butterfly uses to attach topsheets.

Iskandar


Sure, but the question is....how do those glues react to the sponge and rubber?

Not willing to mess up several top sheets and sponges to figure that out.

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PostPosted: 29 Jan 2017, 03:57 
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Red wrote:
I guess the secret to glueing a top-sheet onto the sponge is temperature. I guess you'll need an oven or at least an iron to remove them efficiently.


I don't know what Butterfly uses for adhering topsheets to sponge, there's a video on YouTube about how it's applied (big machine with a wet roller) and how the topsheets and sponges are put together. Yes, I think there's heat involved but I don't think the glue is a thermoplastic, I suspect it cures, i.e. polymerizes when heated. That means it'll take a lot more heat to remove it that they used to cure it in the first place. Someone on this forum posted about "recovering" Tenergy sponge (probably to put a different type of topsheet onto it). He put the rubber in boiling water, and then used tweezers to un-stick the pips one by one. Sounds more than a little tedious!

Japsican wrote:
iskandar taib wrote:
There are MUCH stronger contact cements than rubber cement or table tennis water based glues. Not difficult to find, either. Anything used to attach Formica or to repair shoes would qualify. Even these are weaker than whatever Butterfly uses to attach topsheets.


Sure, but the question is....how do those glues react to the sponge and rubber?

Not willing to mess up several top sheets and sponges to figure that out.


There's all sorts of cheap sponge and topsheets available for experimentation. And you can always use cutoffs to experiment with (surely you have cutoffs of OX topsheets?). I'd worry a lot more about getting the glue evenly onto the top of the pips, and spread thinly and evenly over the sponge. The sheet-of-glass method should work, I first heard about it from an ex-Chinese national team player who was doing a PhD where I was going to University. His advice (he was a pips-out hitter) was to "find a sheet of sponge you like" and stick with that, changing only the topsheet when needed. Apparently back when he was playing seriously (2nd tier national team) sponge must've been really inconsistent. Had a bunch of sponge and topsheets for sale, too..

Table tennis glues are MEANT to be weak, the bond is meant to be impermanent. Even rubber cement was designed so that people doing magazine layups could move bits of paper around on a layup sheet, which is why it works for gluing table tennis rubbers onto blades. You definitely DON'T want to use even yellow tube UHU for that!

Iskandar


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PostPosted: 15 May 2018, 02:45 
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http://www.eacheng.net/Super-729-FX-Lar ... 10835.html

729 FX Super, newly developed Large Pores Sponge now available 1.0mm thick.


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PostPosted: 15 May 2018, 04:38 
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iskandar taib wrote:
It'll never work man. Not with the glues we use for attaching rubber, anyway. The glue they use at the factory to attach toosheets is something a great deal stronger than anything we use. Try separating a Sriver topsheet from the sponge, you'll end up destroying the sponge or pulling the pips off the topsheet. If you can't get this sort of bond then you have a sub-optimal setup. If you really do want to do this I'd suggest using the type of contact cement they use for formica countertops rather than anything they sell for use in table tennis.

Iskandar


FOOL'S JOB ....



Making Buterfly Ekrips rubber.

https://youtu.be/SozRZAxg6vk?t=562

It looks they heat up the bunch of rubbers and then apply some pressure to glue sponge and rubber together.
Certainly, you need a heating machine, or you cant get the bonding strong enough.

Yes, gluing rubber with some hardware adhesives is a futile job. Nowdays, nobody would do the gluing job at home. Fool's job, indeed.


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