不受湿度影响的新一代高阻隔膜
ConstBarrier is QIC Packaging’s next-generation high-barrier film, delivered as pre-made pouches and engineered for oxygen-sensitive liquid foods. Built on a metallized-film structure, it adds QIC’s proprietary constant-barrier layer onto the PE substrate ahead of the VMPET layer, replacing the conventional EVOH solution.
It looks like a standard metallized film — identical to the common VMPET+EVOH ultra-high-barrier films on the market — so end consumers need not adapt to a new package appearance. If you currently use a clear EVOH film, the look will differ (ConstBarrier is metallized), but both barrier performance and user experience are superior to the original solution.
| Metric | EVOH Ultra-High-Barrier Film | ConstBarrier |
|---|---|---|
| OTR (Oxygen Transmission Rate) | <0.5 cm³/(m²·24h·atm) | <0.3 cm³/(m²·24h·atm) |
| Performance under high humidity | Barrier drops sharply at RH>60% | Unaffected by humidity, constant performance |
| Temperature sensitivity | Barrier declines at high temperature | Minimal temperature impact |
| Cost per square meter | Baseline | ~RMB 0.5 cheaper |
| Supply chain | EVOH mainly imported from Japan | Independently developed, stable supply |
| Sterilization processes | UHT / Pasteurization / HPP | UHT / Pasteurization / HPP |
恒阻膜最核心的差异化优势，是它在高温高湿环境下阻隔性能的稳定性。
EVOH (ethylene-vinyl alcohol copolymer) offers excellent barrier in dry conditions but is hygroscopic by chemical structure. Once ambient relative humidity exceeds 60%, EVOH chains absorb moisture, the free volume between polymer chains increases, oxygen passes through more easily, and barrier performance drops — with significant degradation possible at 80% RH. This is inherent to the material, yet an easily overlooked risk for many customers.
ConstBarrier’s key differentiator is the stability of its barrier performance under hot, humid conditions. Its barrier mechanism does not rely on a dry environment, so OTR readings stay consistent at both 30% and 90% relative humidity — the product receives the same oxygen protection from factory to shelf. You no longer have to worry about packaging failure from heat and humidity inside ocean containers shipped to tropical countries, and storage needs no special climate control, lowering operating cost and risk.
Highly oxygen-sensitive; vitamin C oxidation directly affects quality. ConstBarrier OTR<0.3 provides a larger safety margin
180-day shelf life demands high barrier stability; ConstBarrier shows no long-term decay
Aroma and flavor compounds oxidize easily; ConstBarrier outperforms EVOH on aroma retention
BIB pouches need 6-18 months shelf life; ConstBarrier stays stable in long-term storage
High heat and humidity during ocean freight — a natural fit for ConstBarrier
Cold-pressed and functional oils need better barrier than ordinary metallized film
A：There are two main ultra-high-barrier films on the market: the VMPET+EVOH combination is metallized in color, while pure EVOH film is transparent. ConstBarrier is metallized in color, identical to the first type, so end consumers see no difference. If you currently use clear EVOH film, the pouch will change from transparent to metallized after switching, but barrier performance and user experience are both superior to the original.
A：Mainly as pre-made pouches. You tell us the pouch type, dimensions, capacity and filling method, and we produce ConstBarrier pre-made pouches ready to run on your filling line on arrival. If you need roll stock to make pouches on your own equipment, we can deliver film rolls, but pouch-making equipment compatibility must be confirmed in advance.
A：Yes. The thickness, fitment specifications and processing characteristics of ConstBarrier pre-made pouches match mainstream high-barrier pre-made pouches on the market, so no filling-equipment parameter changes are needed. For a first engagement we recommend a trial batch to validate on your line.
A：MOQ is counted by number of pouches and varies by pouch type. For a 20L BIB pouch, MOQ is roughly 5,000-10,000 pre-made pouches. New customers can run a small sample test first to validate fit, then order in volume; long-term customers can sign an annual framework agreement to lock in price and supply.
A：It fits many common pouch types, including BIB pouches (1L-25L), aseptic bags (1L-1000L) and drum liners (220L). For special pouch designs, share the requirements and we will advise after evaluation.
A：We ran accelerated aging tests simulating 12-, 18- and 24-month storage; ConstBarrier OTR stayed stable at all three points. In a high-humidity comparison against EVOH, ConstBarrier OTR held constant at RH80% while the EVOH control showed measurable degradation.
A：Yes. ConstBarrier is HPP-validated: after 600 MPa pressure treatment the film structure remains intact and OTR is unchanged.
A：For standard specifications, about 10-15 working days from order confirmation to delivery; new customers first go through sampling confirmation (about 3-5 working days). Rush orders can be expedited.
