Cap sealing with Induction

Ambrell has over 10,000 systems installed in over 50 countries and many of them are cap sealing application installations.

cap sealing with induction

Induction is the method for hermetically sealing the cap for a plastic or glass container. A foil lining inside the cap is heated in the inductive field rleleasing a polymer to effect a seal to the container.

We offer exceptional customer service before and after the sale. Your Cap sealing application will be analyzed and tested in the nearest Ambrell Applications Lab. There is no charge, and you will receive a system recommendation designed to deliver the best possible solution for your brazing requirements. Ambrell delivers the expertise, innovation and system quality to give your company a competitive edge.

Ambrell: About Induction Heating

Read our 4-page brochure "About Induction Heating". Learn more about how the science of induction technology can solve your precision heating problems.

Click to read one of our many cap sealing application notes (after a brief, free registration); learn more about:

The food and medical industries require high-speed hermetic sealing between the cap and the container. Induction heating with Ambrell equipment provides the following benefits for cap sealing applications:

  • high reliability seals
  • easy integration into production lines
  • high process speeds
diagram 1

A cap- to-container seal is made with the aid of a laminated disc composed of a wax layer, aluminum layer, and a polyethylene (PE) layer (illustration).
The aluminum layer acts as a susceptor, heating to about 125-150°C in the electromagnetic field produced by the induction coil. It then heats the wax and PE layer sufficiently to produce a hermetic seal between the cap and container. Heating times are in the order of 100 milliseconds, supporting a high-speed automated process.

Typical RF power supplies for cap sealing range from 1 to 20 kW, depending on the parts and application requirements.

A cap seal liner is comprised of a multi-layered board:

diagram 1

A cap seal liner is comprised of a multi-layered board:

  • the first and thickest layer of material is the board re-seal
  • next is the layer of wax used to hold the aluminium foil to the board re-seal
  • next is the aluminium foil
  • last is a heat seal film compatible with the type of container to be sealed
utm_medium material docid title title_DE title_FR title_PT title_ES blurb regn_link
capsealing   cap_sealing_6 Sealing an aluminum disk onto a plastic cap Versiegeln einer Aluminiumscheibe auf einen Kunststoffverschluss Scellement d’un disque en aluminium sur un capuchon en plastique Selandura de um disco de alumínio para a tampa de plástico Sellado de un disco de aluminio a una tapa de plástico Induction heating enabled the aluminum to seal to the plastic cap quickly without the cap being damaged. The customer desired a quick rate which would make in-sourcing the process worthwhile, and induction heating exceeded the targeted production rate thanks to its fast heating. apps_able.php
capsealing   cap_sealing_5 Heating pre-assembled plastic tube and cap for cap sealing application Erwärmen einer Kunststofftube mit Verschluss für eine Anwendung zur Verschlussversiegelung Chauffage d’un tube en plastique préassemblé et d’un capuchon pour une application de scellement par opercule Aquecimento do tubo de plástico pré-montado e tampa de vedação para aplicação de tampa Calentamiento de tubo de plástico y tapa preensamblados para aplicaciones de sellado de tapa  Customer currently has Ambrell equipment and would like to increase their run rate. apps_able.php
capsealing   cap_sealing_3 Cap Sealing 3.5” Lotion Container Verschlussversiegelung 3,5” Lotion-Behälter Scellement par un opercule de 8,89 cm sur un pot de crème Vedação de tampa de 3,5 para tubo de creme Sellado de tapas de 3,5 pulg. para envases de loción Power is applied directly to the foil; no energy is wasted heating the cap or the surrounding air or parts. apps_able.php
capsealing   cap_sealing_2 Cap Sealing; Shampoo Container Verschlussversiegelung; Shampoo-Flasche Scellement par opercule sur un flacon de shampoing Vedação de tampa para envase de Shampoo Sellado de tapas; envases de champú  A three-turn two-position helical coil is used to heat the aluminum foil in a tunnel style assembly. Product (containers) passes easily under the induction coil. apps_able.php