FAQs

Q?

How to get a hermetic seal on the container?

A.

In order to get a good hermetic seal, it's necessary for the foil innerseal (inside of the cap) to be in contact with the lip of the container and have consistent pressure around the circumference. This is accomplished by applying correct application torque to the cap. When the application torque is inconsistent, the result is inconsistent seals. Causes of inconsistent seals are either cappers that are out of adjustment or have worn tightening wheels, or by poor bottle/closure tolerances resulting in caps and bottles not fitting properly together. Sometimes these irregular fits can be solved with proper types of foil innerseals.

Q?

Induction Sealing, is it Tamper Evidence?

A.

Depending on the inner seal material used, it can meet requirement of "tamper evident" and also packaging or the seal can provide leakage protection and shelf life extension, often referred to as a "freshness seal". Many varieties of innerseal materials suitable for PET, PP, OE, PVC and Glass bottles 7 containers have been developed and are available from a number of suppliers.

Q?

What is a Single Piece Induction Foil?

A.

Unlike the previously mentioned foil with pulpboard backing, the liner is laminated with a foam or paper backing. When the liner is heated causing the polymer to adhere to the container, the entire liner with backing is attached to the mouth of the container. There is no separation of components when the cap is removed. This type mostly used on the products that will use after the induction seal removal and it does not remain in the shelf for a long time.

Q?

What is induction Sealing?

A.

Induction sealing is a non-contact heating process that accomplishes the hermetic sealing of a container with a closure that includes a heat-sealable foil laminate Liner. There are generally 2 different types of induction sealing liners. Type one is 1 pc Induction Seal material the other type is 2 pc Induction Seal Liner (there is a foam or paper backing with the foils seal)

Q?

What is a Two Pieces Induction Foil?

A.

paperback induction foil

paperback induction foil

The typical induction innerseal begins as a multi-laminate liner inside a closure made up of the following layers:

  1. layer of pulpboard (paper backing)
  2. a layer of wax
  3. aluminum foil
  4. a layer of polymer

The polymer layer is compatible with the container material and capable of heat sealing to the lip of the container.

When the closure is placed onto the container and is passed through the sealing head, several things occur. An electromagnetic current, called an eddy current, is induced into the foil portion, resulting in a resistance-type heating effect. The heated foil melts the wax layer, which is absorbed into the pulpboard (backing paper), releasing the foil from the pulpboard, and the polymer coating melts, hermetically sealing the foil to the lip of the bottle or container.

When the closure is opened (released) the inner seal is welded to the lip of the container, and the pulpboard remains on the inner side of the bottle closure.

High speeds can be obtained using this process making it well suited for high capacity production lines like dairy, beverages, food etc.