DPH series Blister Packaging Machine Forming Station

DPH series Blister Packaging Machine Forming Station
After the Heating Sation, the warm forming material (PVC) will then arrive in the Forming Station, the Lower Forming Mold rise and close with the Upper Foming Mold where a large air pressure (4 to 6 bar) will form the blister cavity from the Forming Mold. Then the Lower Forming Mold go down, the blister is cooled so that the plastic becomes rigid again and maintains its shape when removed from the Forming Mold by the Forming Traction Mechanism. In cases 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 tablets.
DPH series Blister Machine Forming Station schematic diagram:

  1. Forming Cover Plate 2. Upper Forming Soleplate 3. Upper Forming Mold 4. Lower Forming Mold 5. Lower Forming Soleplate 6. Forming Pillar 7. Forming Guide Pillar 8. Upper Nut 9. Lower Nut 10. Lock Nut 11. Lock Handle 12. Swing Arm 13. Handle 14. Guide Rail 15. Butterfly Washer 16. Mold Fastening Bolt 17. Air Inlet 18. Lock Pit 19. Washer Shield 20. Forming Roller Block 21. Forming Body 22. Lock Bolt 23. Mold Stop Block
    Blister Machine Forming Mold changeover
    Stop the Blister Machine when the Lower Forming Mold at its lowest position, turn off the machine’s power
    Change the Upper Forming Mold
    Loosen the Mold Fastening Bolt (16) take out the Upper Forming Mold from Upper Forming Soleplate (2), and then push the new format inside, after that fasten the bolt (16).
    Change the Lower Forming Mold
    Loosen the Lock Handle (11), turn the Swing Arm (12) to unlock the Lower Foming Mold, then pull out it by Handle (13) through the Guide Rail (14), insert the new format inside until touch the Mold Stop Block (23) , then turn the Swing Arm (12) to the Lock Pit (18) to lock the format.
    In The Blister Packaging Machine, one of the common problem is the formed blister does not align with the sealing mold, to fix this problem one of the measure is to adjust the position of the forming mold, by loosen the Lock Bolt (22) we can adjust the Lower Forming Mold’s position to the right or left a little bit, when finish the adjustment fasten the Lock Bolt (22) again.
    Blister Machine forming mold pressure adjustment
    The Blister Machine may encounter forming problems during production, there are many aspects may cause the forming defect (please see at:www.jornen.com/defects-of-thermoformed-blister), in case of non-integrated forming, one of the reason it may be the press between the upper and lower forming mold is not enough thus leads to air leakage.
    The adjustment of forming pressure
    To inch the Blister Machine, stop it when the Lower Forming Mold run at the top position, at this point the compressed air blow into the mold, loosen Lock Nut (10) and rotate the Lower Nut (9) down, and then turn the Upper Nut (8) to adjust the pressure of upper and lower mold. During adjusting please turn the 4 Upper Nuts (8) equally so the upper and lower mold can touch evenly, as the presser become larger and larger the air leakage will be smaller, stop the adjustment when the air leakage is not obvious, then run the Blister Machine again to observe the blister quality, after the adjustment rotate the Lower Nut (9) up and fasten the Lock Nut (10).
    Always try to make the mold pressure as small as possibile as long as can get good blister forming, large pressure would shorten the life span of the Forming Cam or even damage it.
    Note: During the mold pressure adjustment, please must make sure the Lower Forming Mold at its top position (the Forming Cam at highest position), otherwise it will damage the Blister Machine badly.