Referred to as the pull-in lid, which is ring-pull cans on the general design of this type of packaging easy to open the lid, you could pull it when you turn on the valve ring, tearing a little harder to open the lid. Ring Pull open the principle of easy open end is: first place in the pre-open lid indentation, reducing its local strength, in the vicinity of the open ring pull generated at a higher concentration of stress, under the action of shear force, is the indentation at the cracking open. Generally the smaller the pressure difference inside and outside the tank, the shearing force generated at the indentation is small and uniform, can not self cracking, to ensure that the transport and storage process canned product safety.

EOE pull ring has two forms: one is a small-mouth, pull the ring pull lids open a small mouth, small mouth can thus sucked out or pretty fluid contents, such as soda cans belong to the class of small-mouth; another one is the big-mouth, pull the ring pull lids were lifted almost entirely to remove solids, powders or highly viscous contents from the thick of the most common is the inner cover a variety of rice pudding.

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