包装材料ガイド: OTR/WVTR

Question 1

What is a high barrier film in flexible packaging?

Accepted Answer

A high barrier film is a laminated structure designed to significantly reduce the transmission of oxygen (OTR), moisture (WVTR) and light. Common barrier layers include aluminum foil, VMPET, EVOH and high barrier coatings combined with PET, PE, CPP or NY layers.

Question 2

What do OTR and WVTR mean?

Accepted Answer

OTR (Oxygen Transmission Rate) measures how much oxygen passes through a packaging film. WVTR (Water Vapor Transmission Rate) measures moisture transmission. Lower values indicate better barrier. These metrics help select the right structure for product shelf life requirements.

Question 3

Which products need high barrier packaging?

Accepted Answer

Coffee, nuts, fried snacks, sensitive powders, pet food, retort meals and some pharmaceutical or nutritional products typically need high barrier packaging to protect against oxidation, moisture uptake and aroma loss.

Question 4

What is the difference between barrier and non-barrier structures?

Accepted Answer

Barrier structures include a dedicated barrier layer such as VMPET, aluminum foil or EVOH. Non-barrier structures like PET/PE provide basic protection against moisture but offer limited oxygen or aroma barrier.

Question 5

What information is needed before quoting high barrier packaging?

Accepted Answer

Product type, target shelf life, OTR/WVTR requirements if known, preferred material, bag size or roll width, thickness, quantity, printing colors, artwork file, target market and China OEM or domestic warehouse handover requirement if applicable.