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Blown film equipment supplier W&H and partner NIPPONGOSHEI Europe have developed a new film solution that allows multi-layer barrier films made of different resin materials to be dissolved
.
Typically, high-barrier films produced at scale contain layers of PA, EVOH, adhesive, and polyethylene
.
However, due to the incompatibility of various plastics, the uneven mixing of plastics in the barrier film can lead to defects in subsequent products (impurities, gels, stipple, etc.
), which affects the recycling of the barrier film
.
The solution launched by W&H and NIPPON GOSHEI Europe uses layers of water-soluble material to achieve structural separation of the different polymer layers, which means that the polymers of each layer can be individually re-granulated and recycled
.
Specifically, Nichigo G polymer BVOH is used instead of EVOH, and the PA layer is embedded to form the following recyclable membrane structure: PE-AP-GP-PA-GP-PAGP-AP-PE
.
With the help of water, polyethylene-based materials (adhesives and polyethylene) can be separated from polyamides
.
Due to the difference in density, PA in BVOH aqueous solution sinks to the bottom
.
W&H's VAREX II blown film line can provide the required melt distribution, using VAREX II's 9-layer and 11-layer technology to meet the different requirements of different raw material categories
.