The most wide-spread and known applications for processing of similar materials are the DeCo 2-layer and ReCo 3-layer processes. For these processes, more cost-effective materials with regrind as a main-layer and high-end materials with expensive masterbatches for a thin outer-layer, are used. The goal is to lower material costs without sacrificing container quality.These typical multi-layer applications are commonly used for automotive oil containers with high regrind use in the middle layer or in the cosmetic and household industry for savings of expensive masterbatches.
The Multi-Layer Technology
In addition, special applications and unique appearances in packaging solutions can be realized. Examples are:
- “Soft-touch” layer for a silky feel
- Gradation effect; a dark-to-light fade of a color on a container surface
- Black middle-layers for UV protection in white dairy bottles.
Special requirements for new packaging applications demand the use of different materials with various properties. In these cases, several layers of different materials are bonded together to form a parison.
Possible applications for this multi-layer technology include similar materials that can be combined without any problem, as well as dis-similar materials that require a bonding agent to combine properties.