PressureBall - How to Stop Tennis Balls Losing Their Bounce 

Great info!!

How much time is needed to get back pressure estimated

Plz guide

I use a digital pressure gauge. Anyone will work.

15 psi is the line in between the 10-20. 15 psi is good for storage.

The club I play at has a ball machine and a big box of balls for communal use. They are all very flat! The balls get squashed a lot as they get forced through the rollers and this crushes the air out of them. I tried to restore a few near new but flat top grade Slazenger balls from the box, however I found most could not be restored. Some even imploded in the pressure tube. It seems their use in a ball machine increases the gaps of the microscopic holes the air can pass through and they no longer can hold pressure within the ball. If you want to use a ball machine I suggest you invest in a few pressureless balls (Spinfire) and see if they survive being forced between the rollers.

Have u managed to find any containers? I have as well 100s of balls

HI@@brucesaunders2613 I didn't notice this comment until just now. I ended up getting a Spinfire V2 ball machine and got some pressureless balls. I didn't like the pressureless balls at all, they don't properly emulate a real tennis ball and I found them putting more pressure on my strings and I didn't like that. I put Wilson US Open balls and AO Dunlop balls through the Spinfire ball machine and they were great #Perfect. Yes they slowly go flat from new but not any where near what I was hearing like they won't last at all, I have found them to be great. Another thing those Pressureless balls lose heaps of felt and proper pressurised balls I have found don't lose anywhere near the felt off the ball. Pretty much none after 300 balls. So yeah I am using pressurised balls. I'll do another reply because I am using a different way to re pressurise the older balls.

@@snackwelln7292 Hi there Yes well I have found a solution and it has taken a while to sort out. I'll post a new reply about it. :)

Hi Everyone, Results = I did it, pressurized 70 tennis balls at once. Here is my story so far. :)) So after some research I found there is kind of containers you can buy to pressurise a lot of balls at once. It is like a Beer keg converted into a Tennis ball Pressurizer. I wanted to buy one but they didn't ship to my country so..... I got a excellent condition beer keg. I took it to my friends place and he cut a hole in the top with a Plasma cutter. Then he welded a BSM(Winery) fitting on the top, I got a 6 Inch one so you could easy get your hand in and out to get the tennis balls out. it has a 6 inch Cap that you screw on, again BSM stainless fitting. Then just drilled a whole in the Cap and put a valve like out of a Car tyre in the hole. Done. Well I thought done haha. My first test trying to pressurise balls failed. It has taken quite a bit of tinkering to finally get a great result. Firstly not letting the tennis balls go completely flat because I haven't had any success with those, but balls that are still ok-ish only half flat are great to repressurise even with just atmospheric air. I pumped up my Pressure vessel down the Petrol station using the Air to fill car tyre, so just normal air. I have found I need to pressurise the vessel to 38 PSI and leave for one month. Then release some air, I think lowering to around 30 PSI (can't see because I have no gauge on the vessel atm), then leave for another 1 month. Then decompress vessel and open and Wilson US open tennis balls much much harder and I have been using them in matches with my friends and they say it is just like a new match ball. Some of the balls when they come out of the pressurizer were even over! pressurized, you could tell they were so hard like a rock haha. So yeah. Also you need to turn the pressurizer a couple times every few days to stir the balls around inside. I have 70 Slazenger Advance hardcourt balls in the pressurizer now, they have done 1 month @ 38 PSI, now in the second month at lower pressure like 30 PSI. I have noticed I have been able to get good results with Slazenger balls as well so I am hoping this lot comes out really well. Fingers crossed. Then also yeah to store a tennis ball you would lower the pressure significantly to like 14-16 PSI like this guy in video does with his tube. Same with storing say 200 balls in your pressure vessel while you not using them. Well that's my story so far, as you can hear it's still going haha. #LoveForTennis also Merry Christmas to all and Happy Hitting. I am playing at the Tea tree gully, Adelaide tennis tournament on the 27th so see you there if you're attending :)

Pressureball will definitely repressurise balls to either their point of sale pressure or even higher if you use the tube at 20 psi .It is basic physics .look at the feedback I have received from people using my tubes

The original poster is correct. I have had the tubes a year and they are now randomly losing air so i am having to try to fix that with the clamp bar placement. Also 20psi is too little to to do much to repressurise . The problem not mentioned is that balls lose their bounce over time, yes but also due to being hit.

Pretty simple stuff. basic thermodynamics here. of course a used ball with more small tears or breaks or larger pores in the rubber will leak faster. The concept of restoring pressure is completely true and does work. But if you're using a really old ball it will just lose that pressure faster than a new one. its purpose is to make a new can of balls last much longer than it otherwise would. I can also assure you that with this device you will be throwing that ball out because it's lost its felt before it loses its pressure.

I can speak from experience and this product just works. You can over pressurize the balls of you have it in the tube too long at anything above 14 psi. I left tennis balls in the tube for a few months over the winter and had stored them at 17 psi. They bounced way too high. I have bought it for my friends that have used other ball reviving gadgets and this one allows you to control the pressure to ensure the perfect bounce. Sure the felt wears out but you definitely save money.

So maybe. I am thinking about doing this. It must be a tubeless tire so that the air is around the ball. And tubeless tires have liquid sealant. If you cut the tire then you'll have trouble sealing it. I think the best way to do this is to try to get the tire sealed on the rim without liquid sealant. Maybe have a small protecting cover with small holes (for air) around the balls. The other thing is that normal air (atmosphere) is 14 psi. the tennis ball is twice that. I think this guy is doing everything right, but just not getting his numbers/explanation correct. The psi of the plastic container is showing the difference between the outside and inside air pressure. I think the same is true than of pumping up a bike tire.

That will work if you can fold the ends very tightly so the airs won't come out. I'm planing to buy one of these big tubes in the link! smartstore.naver.com/bktoffroad/products/3617355674

Fits most bicycle pump connection.

Yeah any bicycle pump will work. This product is well worth the money.

The tubes have a standard car tyre valve so any pump that can pump up a car tyre, will pump up the tubes. Ive bought a small electric pump which can be recharged, to pump up my tubes. You can set the pressure and it stops when it reaches that value.

Clear.

that's what's involved in a sales pitch man!

@@thehandseesall sales pitches should be way shorter anyway, this could be succesfull in a 1 or 2 minute video instead of 7

@@DracMastah Agreed, but I bought one so 7mins must work to a degree! 😂😂

Trying to get you intrigued by this.

He learned that in speech class in high school.

It depends on how soft they are. If very soft, 3 weeks. As air goes back in, the pressure difference between the inside of the ball and the air in the tube decreases and the 'pumping up' slows. Top the pressure up once a week.

well yeah, but it's 1 bar + 14 psi inside the tube. it's not like the inside of the tube is in outer space or something.

Tennis balls start with an inner pressure of 14 psi, lose this inner pressure once out of the can because the normal air around the tennis ball is 0 psi, and the higher pressure air on the inside leaks out through the rubber. The way to restore them is by storing them in PressureBall at a higher pressure - e.g. 22-25 psi. The higher pressure surrounding the ball then "leaks" into the inside of the ball - increase the inner pressure. We only recommend storing them at the higher psi while repressurizing them. Once they're bouncing properly again, just store them at the normal 14 psi, and they'll keep bouncing like brand new balls until the felt wears out. You can read more info here if you like: www.pressureball.com/frequently-asked-questions/#revive

Air naturally moves from a high pressure region to a low pressure region until the pressures are equal. The air in a new ball is at a higher pressure than the air outside the ball so air molecules leak through the microscopic holes in the material that the balls are made from both during impact with the strings and sitting in your tennis bag. A new ball will be soft if you don't play with it for a few months If the pressure outside the ball is higher than inside, air will go back into the ball through the same holes that let it out. Retired physics teacher here. I have lots of tubes and they really do work. However you need to be patient. A soft ball will take about 3 weeks to become hard again.

They do sell pumps. Buy 2 tubes and you get a free pump.

Simpson

Your comment is extraneous lol

If the balls have equal pressure to the outside, and you pressurize it to say 20 psi, and it equilibrated to 14 psi inside the balls and in the tube. Then would it still be a scam?

Mike K but he said that the air inside of the tube is set to 14 psi. Sorry bud, still a scam

Actually I can actually attest that this works.i played with the same tennis balls for a long time and the bounce is great. The weight of the ball has gone down because of the lost felt but the bounce is still there

I use this device. It works perfectly. 22psi is the correct number for bounciness in SoCal. Ignore max 20psi, that isn’t enough.

In normal use I would expect balls going into the tube to be only slightly lower than ideal pressure. Only a small amount of air would need to move into such balls and so I think it should work just fine. If the balls are a lot below ideal at the start then you would need to pump up the initial pressure in the container to allow for this. A lot of people use such containers and they do work.