Rialis
Quote: movnk

I didn't like the threaded vacuum caps.
If with the usual ones it is immediately clear whether the vacuum has been preserved. Either the threaded ones are held either on their own threads, or because of the vacuum ...
The curved valve shows that there is a vacuum.
The advantage of threaded ones is that the lid will not fly off and the product will open.
movnk
Quote: Rialis

The curved valve shows that there is a vacuum.
The advantage of threaded ones is that the lid will not fly off and the product will open.
I beg to differ.
The photo shows the cover before and after evacuation (photo in no particular order)
Vacuum caps VAKS
Vacuum caps VAKS
The differences are minimal. And you can only approximately determine the lid under vacuum, if next (for comparison) a lid without vacuum. You can also try lifting the jar by the lid. The lid without vacuum under it will be removed from the can. But the screw cap will lift the jar anyway!
And so it turns out, in order to check the presence of a vacuum under the screw cap, you have to first un-evacuate and then evacuate again. And this time ...
OgneLo
Quote: movnk
Differences are minimal
judging by the images, the vacuumized lid in the first photo
Rialis
Bottom with vacuum. In the middle, the shelf is more pronounced, the outer contour is raised.
The clarity does not appear immediately, after 5 minutes.
movnk
Quote: Rialis

Bottom with vacuum.
Right. But the differences are minimal
Rialis
Quote: movnk

Right. But the differences are minimal
It would be nice for manufacturers to provide an indicator.
movnk
Quote: Rialis

It would be nice for manufacturers to provide an indicator.
I wrote them this offer on their website

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