How are flexible magnets manufactured? – Flexible magnets are the same as ferrite magnets with the addition of synthetic rubber which makes them flexible. A ferrite magnet is an alloy made of strontium carbonate and iron oxide.

Flexible magnets can be made in two different ways, either by extrusion, or calendering. The two different processes are needed to create the different widths of flexible magnet.

Extrusion, which involves shaping the molten material used to make a magnet with a die, is used for the thin flexible warehouse magnets and flexible magnetic tape.

Flexible magnets manufactured

Flexible magnets manufactured

Calendering, on the other hand, where the molten material is forced between rollers, is used to create the wide flexible magnetic sheets.

flexible magnets manufactured – Extrusion

Step 1 – Calcination
A powdered mixture of iron oxide, strontium carbonate, and synthetic rubber is heated in an induction furnace to a 1350°C (2462°F) to create a metal oxide.

Step 2 – Shaping
The molten material is then forced through a hardened die which is the shape of the final magnet. For example, a flexible warehouse magnet will be forced through a die with a C profile.

Step 3 – Cooling and magnetising
As the material flows through the die, it cools into shape. Once the magnet has cooled, it is moved over a magnetising plate which magnetises the flexible magnet with a strong electromagnet.

Step 4 – Laminating
The flexible magnet is then laminated with either a vinyl top layer or an adhesive with a HMT hot melt film laminating machine.

Step 5 – Cutting and rolling
The flexible magnet is then cut to the required length and rolled onto a core. A core is the round piece of material in the centre of a roll of flexible magnetic tape.

flexible magnets manufactured – Calendering

Step 1 – Calcination
A powdered mixture of iron oxide, strontium carbonate, and synthetic rubber is heated in an induction furnace to 1350°C (2462°F) to create a metal oxide.

Step 2 – Rolling
The molten material is then squeezed through two rollers to flatten it into a sheet whilst it is cooling. To achieve a depth between 0.2mm (0.008″) to 5mm (0.2″), the sheet is squeezed through the rollers several times.

Step 3 – Magnetising
Next the sheet is moved over a magnetising plate which magnetises the flexible magnetic sheet with a strong electromagnet.

Step 4 – Laminating
The flexible magnetic sheet is then laminated with either a vinyl top layer or an adhesive with a HMT hot melt film laminating machine

For more information on the types of adhesives and laminates, see the page: What are the parts of a flexible magnetic sheet?

Step 5 – Cutting and rolling onto core
The flexible magnetic sheet is then cut to the required length and rolled onto a core. A core is the round piece of material in the centre of a roll of a flexible magnetic sheet.

Flexible Magnetic Sheeting Rolls

Flexible Magnetic Sheeting Rolls
PVC Fridge Rubber Magnet Roll

PVC Fridge Rubber Magnet Roll
Extra Wide Magnetic White Vinyl Rolls

Extra Wide Magnetic White Vinyl Rolls
Self Adhesive Plain Magnetic Sheet Rolls

Self Adhesive Plain Magnetic Sheet Rolls
Vinyl Coated Magnetic Rolls

Vinyl Coated Magnetic Rolls
Printable White Vinyl Magnetic Rolls

Printable White Vinyl Magnetic Rolls