In the case of thermoforming, a plastic film or sheet is unwound from the reel and guided though a pre-heating station on the blister line. The temperature of the pre-heating plates (upper and lower plates) is such that the plastic will soften and become pliable.
The warm plastic will then arrive in a forming station where a large pressure (4 to 8 bar) will form the blister cavity into a negative mold. The mold is cooled such that the plastic becomes rigid again and maintains its shape when removed from the mold. In case of difficult shapes, the warm film will be physically pushed down partially into the cavity by a "plug-assist" feature. Plug-assist results in a blister cavity with more uniform wall distribution and is typically used when the cavity size and shape is larger than a small tablet.
Last modified on Saturday, 21 August 2010 23:16
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Maryland Thermoform is a source solution provider of manufactured plastic packaging, products and components utilized in the Cosmetics, Personal Care, Medical, Food, Industrial, OEM and Defense industries for over 30 years.
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2 comments
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Thursday, 24 June 2010 03:26
posted by Robert
Your articles are continuously amazing. Thanks.
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Thursday, 24 June 2010 03:27
posted by Paulo
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