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.

Marvin is the lead chocolate maker of Ben and Lyn Chocolate Inc. Has strong background in food research and development. Occasionally conducts training and lectures. Lecturer of Cocoa Foundation of the Philippines. Do coaching and consultancy services on his free time.

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