Project for somebody.....

[Dutch Welder]

At about 8 bars of pressure the domed end pops out.
That's actually a test for can quality.

 

[James1979]

At about 8 bars of pressure the domed end pops out.
That's actually a test for can quality.

I wondered if that was the same as spray cans etc which also have that same end for fires and things.

What pressure will it burst……

 

[Onoff]

Working on the theory you buy entire new shells for Minis, Midgets and MGBs, quite a lot . . .

& Mustangs. Sadly not Capris though.

 

[zzr1200]

Come on it's only a weekends work of swapping parts and a bit of welding........

 

[Myles1970]

Come on it's only a weekends work of swapping parts and a bit of welding........

No welding required… the vin plate is riveted on

 

[bricol]

I've seen it argued that a fizzy drink can is now almost perfect in terms of design. They can't be made with thinner walls nor lightened without them failing.

A book called Rust: The Longest War by Waldman is where I read about them. Interesting and irritating at the same time. The author called corrosion on aluminium rust too, and that's just plain wrong.

Nope, light-weighting still going on. So plants that just about made the grade get found out as the thinner material shows up all the weaknesses, the mis-settings, wear and tear problems.

Add into that the pressure to increase the speed lines, therefore making the likelihood of damage more likely.

 

[bricol]

So is a fizzy drink can a pressure vessel for the purposes of any regs?!

Honest wondering. They get transported all over and no one treats them like cylinders but they must have to withstand a bit of pressure I suppose. Dunno. Never thought of it.

There's a lot of transport in most cases before they get filled and the ends seamed on - up around Carlilse a lot of the Eddie STobart trucks would have been moving a lot of fresh air around, surrounded by thin aluminium . . .

On one case I know of, cans were made in the USA, shipped over here, had another forming operation carried out, and then shipped back to the USA for filling . . .

I only know of a couple of plants in the world where the cans go on a conveyor straight from manufacturer to filling.

You can stack empty cans quite high with no real problem. Filled cans rely on the contents to add strength when they are shipped about. Big name customers are known to send entire lorry loads back for one leaker . . . Some serious quality checks on cans throughout the process. Some nasty chemicals involved too.

 

[bricol]

I wondered if that was the same as spray cans etc which also have that same end for fires and things.

What pressure will it burst……

You hear the quality checks above the incredible noise in most plants, as the dome reverses, or pops . . .

There's some incredible little details in the structure to give strength in ever thinner material.

Look at the bottom of the can, the dome. Its recessed a touch - a short straight section form the radius the cans would sit on on the shelf. Some cans are just straight there - others will have a little groove formed around that wall to increase its properties.

All done at some speed too, usually in the "necker" - machine that takes a straight sided can, and pushes it into a series of forming dies, while pushing a knock-out tool inside at the same time, to reduce the opening, to "neck" the can (means the thicker closure with the tab is smaller diameter and therefore costs less - think of a can from last century - straight sides, big top, big ring pull), put that groove around the inside of the dome, form a flange on the top, test it for leaks, test it for deformation/label damage and send it onwards - around 3200/3400 cans per minute . . .

 

[bricol]

That was just one line. They had more That was coke cans

Coke cans today. . . or even this week . . . wander in tomorrow, next shift, next week it might be Pepsi . . . or a beer can . . . imagine the checking done after a print change - you do not want to be sending Coke cans to Pepsi for filling

 

[bricol]

Nothing to do with the original topic, but continuing the can theme, an interesting project I was involved in a few years ago that took a perfectly good can and allowed gas to be inject in to froth the contents, has moved to another owner.

Now used to shove cannabis extracts into drinks in some states in the US . . . I'm being asked for samples . . .

New owner sent me a video of it running again - pleasing to see.

 

[zzr1200]

No welding required… the vin plate is riveted on

This is true, but somewhere there'll be a little bit of the chassis with a Serial No stamped in it that will need cutting out and transferring over. So there's your cutting n welding....

 

[Myles1970]

This is true, but somewhere there'll be a little bit of the chassis with a Serial No stamped in it that will need cutting out and transferring over. So there's your cutting n welding....

Ah….. so I’m in the right forum then

 

[zzr1200]

Ah….. so I’m in the right forum then

For cutting n welding yes, but not for vehicle cloning... ...that's illegal...