For any housewife, with the onset of the warm season, hassle only increases. First, you need to plant something in time on the site, and then still find the strength to harvest. After that, many are faced with the problem - how to preserve this so that in winter you can regale your household? The main way to preserve berries and vegetables is conservation.
This method has undergone many changes over the years of its existence. Everyone remembers the old seaming machines. Many use them to this day. The disadvantage of this device is that it must be used with great care. Having put a little more effort than required, you will get a jar with a spoiled neck, which you will not be able to use in the future. But as a result of numerous samples, the housewives today know how to properly roll up the cans with a machine.
But everything changes, and the old banks were replaced by new ones whose lids are twisted. That is why more and more housewives are asking this question: "How to roll up cans with screw caps?"
Operating principle
The screw caps are called twist-offs and have long been used for conservation in Western countries. The essence of their principle of operation is as follows. On the inside of the lid there is a special polymer coating that acts as a gasket. Under the influence of high temperature, it expands and tightly seals the jar. With decreasing temperature, as it cools, the top of the lid is pulled inward, which is accompanied by a slight click. As a result, a vacuum effect is created in the bank. Therefore, before rolling up the cans with screwed lids, it is necessary to heat the lids.
Terms of use
Most housewives, looking at their neighbors or friends, decide to buy such lids, but they don’t know how to roll up cans with screwed lids. There is nothing complicated here. First you need to sterilize the banks in the same way as conventional ones. This can also be done with covers. The temperature for the lids should not exceed 60 degrees. Otherwise, this will lead to the destruction of the polymer coating.
The heated lid is placed on a ready-to-roll can. In this case, it is necessary to ensure that the grooves on the lid coincide exactly with the stripes on the bank. And it is also important to inspect the cans, or rather the neck, before
rolling up the cans with twisting lids.Quality control
In order to check and relieve yourself of worries about the reliability of the performed conservation, put the closed cans upside down. In this position, they must stand for at least 2 days. If during this time no smudges appeared and the lid did not swell, then you can safely hide the cans in the cellar or basement.
How to open such a jar?
You can often hear from housewives that opening such banks is very difficult. And if there are no problems with how to close the jars with screw caps, then it can be impossible to open them. In order to do this, you need to know a little secret: just turn the jar over and tap your palm on the bottom. Then tighten the cover.
Thus, from the above it can be concluded that the use of new cans with screw caps greatly facilitated the life of the hostesses. This method of preservation is suitable for those who do not want to bother in the kitchen for a long time or do not know how to roll up cans with a machine.