Have you selected the right adhesive coating?

By Daphne Allen in Medical Packaging on January 19, 2018

Water-based and hot-melt adhesive coatings are commonly used for creating peelable seals. There are many formulations, so how do you choose the right one for your package?

Kevin Zacharias, technical director, and Rick Brady, technology manager, both with Oliver Healthcare Packaging, will help you explore your options in their presentation: “Mission Possible: Formulating the Right Adhesive Coating for Your Application.” Held on Tuesday, February 6, at 1:30pm - 2:15pm in the WestPack Hub at Booth #5297 this session is free for all expo attendees.

During the WestPack session, Brady and Zacharias will discuss several common “missions” packaging professionals encounter every day, discuss the adhesive formulation process and the chemistry involved, and address how they solve for the various issues that may occur.

“We are generally formulating for cohesive seal systems, which means that the adhesive layer is the weak point and we get split down the middle of the adhesive,” Brady recently explained during the now on-demand Webcast, “Adhesive Tips & Tricks Every Medical Packaging Engineer Should Know.” Such an approach generates seal transfer, and he pointed to the transfer that can be seen on PETG trays after a coated Tyvek lid has been peeled away.

Oliver can tailor formulations for different properties such as adhesive strength, cohesive strength, adhesive transfer, hot tack, cold shock, antiblock, and others, he explained.

Once you have selected your formulation and properties, you also need to develop your sealing process, determining the temperature, pressure, and dwell time needed for a specified seal strength.

“A word of caution—you can have a good-looking seal cosmetically—the adhesive transfer looks good with no gaps or voids, but you might not be fully optimized because your seal strength is too low,” said Zacharias during the Webcast. “You have to look at multiple factors before deciding whether you are optimized.”

Zacharias was also asked whether an adhesive coating can help “level the playing field.”

“In my experience, having a coating available can be a little more forgiving in a sealing process if you think about the variations in sealing temperatures across the sealing platen as well as in levelness,” he explained. “An adhesive layer can help even things out and can be easier to work with.”

Brady and Zacharias will walk WestPack Hub attendees through such issues, tackling these questions:

  • Is optimizing seal strength for different applications your challenge?
  • Are you concerned with elevated temperatures and sterilizer creep? 
  • How can you mitigate risk?

Don’t miss “Mission Possible: Formulating the Right Adhesive Coating for Your Application,” Tuesday, February 6, at 1:30pm - 2:15pm in the WestPack Hub in Booth #5297.

To listen to the on-demand Webcast, please read our article, “Concerned about risk in your sterile barrier system? Consider your adhesive coating.”

 
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