Spots on the surface of blister packaging

When we produce the blister packaging ,sometimes the surface of the Blister Packaging have spots ,how to solve this problems when we produce blister packaging ( Plastic clamshell packaging / Blister Tray ) ?


1) The surface finish of the mold cavity is too high
Air is trapped on the smooth mold surface, causing acne spots on the surface of the product. The surface of the cavity should be sandblasted, and additional vacuum holes can be added.


(2) Poor pumping
Air extraction holes should be added. If the acne occurs only in a certain part, check whether the suction hole is blocked or add a suction hole in the area.


(3) The mold temperature is too high or too low
Should be adjusted appropriately. If the mold temperature is too high, the cooling should be strengthened and the mold temperature should be lowered; if the mold temperature is too low, the mold temperature should be increased and the mold should be insulated.


(4) Improper selection of mold material
When processing transparent sheets, do not use phenolic resin to make molds, but use aluminum molds.


(5) The mold surface is too rough
The surface of the blister packaging cavity should be polished to improve the surface finish.


(6) The surface of the sheet or mold cavity is not clean
The dirt on the surface of the sheet or cavity should be completely removed.

This is just some reasons ,if you want know more about it ,feel free contact us !