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Cake Packaging

Application Description

DuPont ™ Surlyn® Provides Hermetic Seals, Preserves Freshness of Bauducco Cake

A coex film of low density polyethylene (LDPE) and Surlyn® laminated to metallized PET is used in a multilayer structure for ready-to-eat cakes. The package is gas flushed to preserve quality and improve the shelf life of the cake.
Cake packaging

Benefits Gained
  • Modified atmosphere is preserved, ensuring high quality and longer shelf life of the cake.

  • Increased line speeds.

  • Reliable seals -- even through grease or particulate (sugar) contamination.

  • Prevention of seal failure after gas flushing.
Materials Selected and Why
Originally, linear low density polyethylene (LLDPE) was used in this application; however, the low hot-tack strength of LLDPE made it unable to withstand gas flushing. It also required lower line speeds. Surlyn® 1652SB was chosen to replace LLDPE due to its good adhesion to the LDPE in the coex film and because it has high hot-tack strength, which prevents seal failure after gas flushing.  In addition, Surlyn® provides excellent sealing performance –- even through grease or particulate (sugar) contamination -- and its lower seal-initiation temperature enables increased line speeds.
Direct Customer:  Shellmar - São Paulo, Brazil
End User:  Bauducco - São Paulo, Brazil

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