Barrier properties in packaging materials refer to how well a package blocks oxygen, moisture, light, aroma loss, oil, and outside contamination. For food, coffee, pet food, powder, liquid refills, medical supplies, and daily goods, the barrier level directly affects shelf life, product freshness, leakage risk, and shipping stability.

The most common technical indicators are OTR and WVTR. OTR measures how much oxygen passes through a material under set conditions, while WVTR measures how much water vapor passes through a film. ASTM F1249 is widely used to measure water vapor transmission through flexible barrier materials, and testing conditions such as film thickness, temperature, and humidity can change the final result.

Barrier Type        What It Controls        Common Packaging Need

Oxygen barrier        Oxidation and aroma loss        Coffee, nuts, dried food

Moisture barrier        Water vapor movement        Powder, snacks, pet food

Light barrier        UV and visible light exposure        Sensitive food and supplements

Oil barrier        Grease migration        Sauces, oily food, bakery goods

Aroma barrier        Flavor loss and odor transfer        Coffee, tea, seasoning

Flexible packaging is widely used because it can combine several barrier functions in one structure. The Flexible Packaging Association reports that flexible packaging accounts for about 21 percent of the U.S. packaging market, with industry sales of USD 41.5 billion in 2022. This market demand is closely related to lighter material use, product protection, and efficient transportation.

A single film often cannot meet every barrier requirement. PET may support printing and stiffness, PE can provide heat sealing, PA can improve puncture resistance, and aluminum foil or high-barrier film can reduce oxygen, moisture, and light exposure. The correct packaging structure should match product weight, filling method, shelf-life target, sealing temperature, storage humidity, and export route.

JINGOU focuses on corrugated carton machinery for flexible packaging and secondary packaging production. Our product range includes carton forming machines, cardboard box forming machines, auto thin blade slitter scorers, and auto rotary slotter machines. JINGOU is a high-tech enterprise specializing in corrugated carton machines for small quantity orders, with patented box maker equipment and CE-certified machinery.

Professional advice is to evaluate barrier packaging together with the outer carton. Even a high-barrier pouch may be damaged if the carton is too loose, too tight, or weak in stacking. Accurate carton forming can reduce pouch squeezing, seal stress, crushed corners, and shipping damage.

For project procurement, JINGOU can help customers review pouch size, product weight, carton board thickness, slotting structure, order quantity, and packaging workflow. Share your packaging material, carton size, board specification, and production plan with our team, and we can recommend a practical carton machinery solution for safer packaging and stable delivery.