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| 061022-001 Bottle burst tests |
Aim
- To test at what pressure a number of bottles (1.5L,
1.25L and 2L) will fail.
- To test several reinforcing techniques to increase the
burst pressure.
Experiment Setup
The standard hydrostatic burst test procedure was used to carry
out these tests. (See above). Three reinforcement techniques
were used to attempt to raise the burst pressure:
- Glass strapping tape
- Cheap gaffer tape
- Heat shrinking the bottle to reduce diameter and
increase the wall thickness.
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1.25L bottle re-enforced with Scotch Strapping tape. |
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Blue Scotch "gaffer" tape on a 2L Coke bottle. |
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Detail of the base re-enforcing. |
Results
| Capacity |
Burst Pressure
(psi) |
Burst Pressure
(bar) |
Notes |
|
2 L |
168 |
11.5 |
This was a standard 2L "shaped" Coke bottle
had
the label still attached. It is likely that the label
provided a little re-enforcement. |
|
1.25 L |
250 |
17.2 |
A standard 1.25L bottle re-enforced with
1 layer of Scotch 3M strapping tape. The bottle showed
very good shape retention at high pressures. |
|
2 L |
190 |
13.1 |
The same Coke bottle as above but this
time it was re-enforced with a single layer of blue
Scotch "Gaffer" tape. This tape is quite flexible and
provided very little re-enforcing strength. In the video
it is quite obvious that bottle stretched significantly
before bursting. This tape is useless for
re-enforcement. |
|
1.5 L Heat Shrunk to 1 L |
170? |
11.7 |
This was a test to see if shrinking a
bottle using hot air would make it stronger because of
the smaller diameter and hence slightly thicker walls.
The bottle stretched quite asymmetrically and
burst at regular pressure. This bottle also failed
unlike the others. The bottle failed at the neck and
shattered the nozzle. When bottles stretch it is very common for little
stretched "V"s to form right at the base of the neck.
The bottle probably failed at one of these and the crack
propagated all the way to the top shattering the nozzle
around it. |
Conclusions / Analysis
- The most effective reinforcement technique was the glass
strapping tape.
- The cheap gaffer tape and heat shrinking made little
difference between in providing extra strength.
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