Tamper Proofing a Bottle Cap

Shrink wrap. The thin and short plastic tube. It is wrapped around the cap together with the portion of bottle neck. Applying heat shrinks the plastic resulting to a snug fit.  Heat is apply by pouring hot water, pointing a heat gun or passing the product through conveyor oven.

Shrink wrap is easy to remove and easy to replace with a new one. Company or product logo on it is an added protection.

-Do not accept if seal is broken!

Pop up cap. Possible for metal closures. Cap’s center is slightly embossed upward. It is fixed to hot-filled jar. Hot air inside the will become less excited as it cools. Then creates a partial vacuum pulling the emboss downward. Opening the bottle releases the vacuum. Then the cap returns to its original form and produces a popping sound.

Shrink wrap is always used together with it.

Reverting the cap to its recessed condition is time consuming.

-Do not accept if the center pops up when pressed! or produces a popping sound!
-Do not accept if seal is broken!

pop up screw cap

Crown or tansan. Sealing with a tansan is always done mechanically. Resealing completely is almost always impossible
. A resealed bottle might have a deformed crown and is going to leak.

-Do not accept if crown is deformed.
-Do not accept if the product leaks.

Please read the update for bottle crowns!

Removable lid. Commonly used on bottled waters and soft beverages. A portion of screw cap is left after opening. It looks like a bottle neck ring.

-Do not accept if lid is broken.

screw cap removable lid

update as of May 1, 2012 – The removable cap lid on soft drink bottles was not as fool proof as I thought. Twisting it a little counterclockwise allows the escape of infused carbon dioxide. The air have escaped without breaking the lid. The same is true for crown, it can be forced up a little to allow CO2 escape. It would be more safe if combined with a nicely fitted shrink wrap.

removable cap lid

mountain dew on table

Cork. Wine cork also serve as secondary tamper proof. Pulling it off requires the help of a special tool, cork extractor. Both screw and lever type leave a noticeable scar.

Getting wine with a damaged cork is a grave mistake. Anyone should noticed something is wrong with the outer seal.


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