Please let me know what happens if the bell hammer spray is crushed between machines, etc., or if the can is compressed and crushed.

We do not recommend pressing empty cans or cans with remaining contents (small amount => new cans) because the internal pressure of the can is different and pressing by compression may cause the can to rupture and catch fire due to friction when it is crushed.
We recommend that a hole be drilled in the back of the can to release the gas pressure before pressing.