Seals for bottles

In order to select the proper induction sealer for a particular application, some variables must be considered. Seal diameter is one of the most important variables in sizing equipment. A larger foil diameter requires a different amount of energy than a smaller diameter. 

As there are different types of seals and depending on their thickness, they can be heated in different amounts of seconds so it is essential to record the type of seal for each liner or seals for bottles application.

It is also vital to know the line speed, preferably in meters per minute. If the containers are passing, i.e., being conveyed too fast, they will not be under the sealer for too long, so more powerful equipment will be needed. 

If the only information available is the number of containers per minute, the spacing between the containers should be determined for a more accurate calculation.

Cap and container geometry are additional considerations when selecting the optimum sealing head for the application. There are different types of containers and lids, and most of them can be sealed with a flat sealing head. 

However, some containers, such as those with sport lids, have too large a gap between the container mouth and the induction seal, which is why a special sealing head is required.

In addition, the application range of the liner or seals for bottles must be determined. If a wide range of containers or lids are to be sealed, the equipment must be configured according to the container lid, the container itself and the sealing speed.

Once all the information has been documented, the most appropriate power source and sealing head options available on the market can be selected. For smaller diameter closures, the tunnel type head is usually the most effective. For sport caps, the deep tunnel type head is usually the most effective. 

For caps larger than 53 mm in diameter, the flat head will provide the best solution. If the application includes a wide variety of cap sizes, the all-in-one sealing head is the best choice.

Operation Window

Once you have selected the cap, seal and induction sealing equipment you will need to move on to the next step: setting an operating window for the sealer.

An operating window allows you to obtain an optimal sealing range, recording sealing ranges of no seal, partial seal, good seal and overheated seal.

This information is very important as it provides the fundamental basis for each particular liner or seals for bottles application.