Here for details on product specs, customization, samples, delivery and cooperation terms
Q：What’s the main difference between EVOH and PVDC multilayer coextrusion heat shrink films?
A：Key Differences As Follows:
1.Oxygen Barrier
EVOH: Best at low humidity (RH <60%, down to 0.1–0.5 cc/m²·24h·0.1MPa), but drops sharply in high humidity.
PVDC: Stable across all humidity (≤1.5 cc/m²·24h·0.1MPa), superior in high-humidity conditions.
2.Moisture Barrier
EVOH: Hygroscopic, relies on PE/PA outer layers for protection.
PVDC: Naturally low permeability; moisture barrier is 3–13x stronger than EVOH at high humidity (RH 80–100%).
3.Chemical & Odor Resistance
EVOH: Good oil resistance; odor barrier is humidity-dependent.
PVDC: Excellent oil, acid/alkali, and solvent resistance; superior, humidity-independent odor/flavor barrier (no absorption or release).
4.Humidity Sensitivity
EVOH: Very sensitive; barrier performance plummets above RH 60%.
PVDC: No sensitivity; barrier properties remain consistent regardless of humidity.
5.Typical Uses
EVOH: Low-moisture, oxygen-sensitive products (coffee, nuts, cheese).
PVDC: High-moisture, high-barrier, sterilizable applications (meats, pharmaceutical blister packs).
Q：How many layers of your multilayer coextrusion heat shrink films and bags?
A：We have 2 kinds of products with 7 layers normal standard as Frozen grade EVA heat shrink bags and films and Chilled fresh grade PVDC high barrier heat shrink bags and films, but with the customization requirements for 5 layers and 9 layers.
Q：What sizes, thicknesses and colors are available for your heat shrink bags or heat shrink films?
A：The available Width Sizes: 160mm, 180mm, 200mm, 225mm, 250mm, 275mm, 300mm, 325mm, 350mm, 375mm, 400mm, 425mm, 450mm, with the thickness of 50μm, 55μm and 60μm and length customized as per customer’s requirements; Transparent is the standard color, and colored film is available for customization.
Q：Is customization supported, such as logo printing and special bag shapes?
A：Yes, Custom logo printing is supported, up to 12 colors on both sides, as well as bag types can be customized for our detail further negotiation.
Q：Free samples are available for the trial testing?
A：Yes, free samples are available for your trial testing.
We can provide free samples of heat shrink bags/films for quality and shrinkage performance testing, just contact us through anyway of calling, email or WhatsApp and send us your mail address and the company information, we will contact your within 1 hours for the specifications you need and prepare them.