Sausage casing films require an optimal balance between high oxygen barrier, excellent optical clarity, controlled shrink properties, and reliable interlayer adhesion under severe biaxial orientation.
These films are typically produced using double- or triple-bubble extrusion processes, where adhesion stability must be maintained during high draw down ratios and stretching steps.
To address these requirements, SK Functional Polymer (SK FP) offers a dedicated portfolio of OREVAC® and LOTADER® tie resins, designed to ensure robust adhesion between PE, PA, EVOH, and PET layers in multilayer sausage casing structures.
- Applications
SK FP tie resin solutions are recommended for flexible barrier structures used in:
→ Fresh and cooked sausage casings
→ Hot dogs, frankfurters, and processed meat products
→ High-shrink, high-clarity barrier films
→ Multilayer food packaging requiring biaxial orientation
Examples of multi-bubble extrusion barrier packaging
Structure examples :
PE / Tie / PA / EVOH / PA / Tie / PE
→ Standard high-barrier sausage casing film
Co-PET / Tie / PA / EVOH / PA / Tie / PE
→ High-clarity, high-shrink casing film for triple-bubble extrusion
Product characteristics
SK Functional Polymer offers a complementary portfolio of tie resins covering the full range of interfaces encountered in sausage casing structures produced by biaxial orientation.
→ Excellent PE / EVOH adhesion under biaxial orientation
→ High adhesion performance on PE / PA / EVOH / PET interfaces
→ Optimized melt flow for bubble stability and thickness uniformity
→ High transparency and surface quality
→ Controlled shrink behavior
→ PFAS-free solutions suitable for food packaging
OREVAC® OE825
LLDPE-g-MAH tie resin with high MAH reactivity, designed for demanding flexible barrier films requiring stable adhesion under orientation.
Typical use:
→ Tie layer for PE / EVOH & PE / PA
Key benefits:
→ Excellent adhesion under biaxial orientation
→ Stable performance during double- and triple-bubble extrusion
→ Can be used at 100% or diluted in PE
OREVAC® 18300
LLDPE-g-MAH tie resin optimized for PE / PA interfaces in thin multilayer structures.
Typical use:
→ Tie layer for PE / EVOH & PE / PA
Key benefits :
→ Balanced MAH reactivity
→ Good optical properties
→ Suitable for thin multilayer sausage casing films
LOTADER® 18603T
Ethylene-methyl-acrylate-MAH terpolymer with high polarity and flexibility, designed for PET-containing shrink structures.
Typical use:
→ Tie layer for Co-PET / PE interfaces
Key benefits:
→ Excellent adhesion to PET under orientation
→ High flexibility for shrink applications
→ Low melting point enabling gentle processing conditions