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Part I - Design Variables

Variables to be determined when purchasing
blister thermoforming machinery
Blister Machine Process Schematic

Types of Machines and Sealing Devices

Bosch, IMA produce rotary thermoformers

Rotary, continuous web movement

Platen, indexed web movement

Cam, IMA, Klockner, Noack, and
Uhlmann produce indexing machinery.
More Machinery Variables

• Film Heating - The number and location of controlled heating zones allows for more controlled and consistent web heating. Ideally, the heating plates are 3 indexes long.

• Blister cavities can be filled either by flooding the fill zone with pills, or by dedicated filling manifolds.

• Cooling plates after forming and sealing to be present.

Thermoforming Mold Variables

• Molds may be coated with special releasing materials to aid in blister separation from the tooling. Different coatings may aid in separating one type of film, but may enhance the bond to another.

• Plug-assisted cavities physically “push” the material prior to its final pressurized air forming.
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