Hi , we are developing the blister 3

[StG10]

Hi , we are developing the blister for medical device that can be produced by means of vacuum forming. We tried PETG or GAG materials type. The problem -the product doesn't withstand moisture test ,caused by high glycol level in PETG/GAG ,meaning the blister pass too much water during humidity testing. We are looking for alternative material ,that is suitable for vacuum forming process.
It should be translucent ,moisture resistant , and has Dielectric Strength.
Could ,please ,advise any from PET type , PMMA or probably PVDC films?

Thanks,

 

[btrueblood]

Wow, great job, they blew away all of our responses because somebody wanted the post moved to this forum.

FWIW, you had suggestions to look at layered films, my suggestion was aluminized pvdc sheets, and (I think it was Cpro) said multi-layer sheets of pvdc and some other polymer I was not familiar with. Have you looked into these suggestions?

 

[btrueblood]

Ok, the film that Compositepro mentioned was Aclar, a trademarked product from Honeywell. Yes, it is thermoformable, so are most plastic films.

https://www.packagingcomposites-honeywell.com/aclar/product-information/what-is-aclar/

 

[MacGyverS2000]

bt, your responses are still in the original thread here...

https://www.eng-tips.com/viewthread.cfm?qid=474136

But this was a more appropriate forum, not Automotive Engineering. Had the thread been moved here BEFORE people started answering, this would be a non-issue.

Dan - Owner

http://www.Hi-TecDesigns.com

 

[StG10]

btrueblood , Yes i reviewed it , but aluminized pvdc sheets are not translucent . Regarding Aclar , their site suggests maximum thickness of 7.8 Mil and sale it sheets 8”x 10” ,that is too small . I'm trying to contact them .

 

[Compositepro]

Are you really having that much trouble finding suppliers of suitable film for blister packaging? You need to find a film distributor not a resin manufacturer.

https://www.google.com/search?client=firefox-b-1-d&q=plastic+film+for+blister+packaging+distributor

 

[John2025]

How many are you going to make? My feelings: There are a ton of thermoforming companies with ISO 11607 certification, cleanrooms and lots of experience. I can't imagine your volume is large enough to warrant doing it yourself and if you try to design and develop it's likely to cause more trouble than it's worth.

 

[StG10]

John2025 , The mechanical design is ours. The blister is not simple , it suits for robot gripping has magnet switch and some other features that worse to design inside the company . Blister's producer(thermoforming plant) suggested pETG ,than GAG and we had problem with that and meanwhile have no suggestion from his side . That is the reason why we are looking material alternative ourselves.

 

[Pud]

You might investigate this further. About the lowest water vapour transmission available:

https://www.google.com/url?q=https:...FjAIegQIAhAB&usg=AOvVaw2hT9YlfTdZmN2uGDwnohJs

Politicians like to panic, they need activity. It is their substitute for achievement.

 

[John2025]

Laminated films can deliver good formability and barrier properties. You may need multiple plies to get what you need. A good thermoformer or extruder should be able to help. Is this a peelable package? What are you using as lid stock? What part of the world are in?

 

[StG10]

Yes , it covered with peelable aluminum foil. It's Europe .

 

[John2025]

The aluminum lid stock is excellent. I still think a laminate barrier film is what you need. Sadly I don't have any experience in Europe, but clearly they have plenty of quality suppliers. Maybe contact a machine manufacturer like Kiefel in Germany and see if they can recommend a good company that you can work with. Do you have a spec on water transmission that you can give to a supplier or is that part of what you're trying to determine? Hopefully your anticipated volume is enough to interest a quality former. There's a lot of time and effort for them, too and they understandably have to decide if the project is a good fit.