Coffee packaging needs to do more than just look good. It has to protect what's inside. That's why we use a three-layer structure for our pouches: MOPP on the outside, VMPET in the middle, and PE on the inside. Each layer has a job to do.
The outer layer is MOPP, which stands for Metalized Oriented Polypropylene. It's what you see and touch when you pick up the bag. This layer gives the pouch its strength and stiffness. It holds its shape on the shelf and doesn't sag or wrinkle. The metalized surface also blocks moisture. Coffee beans are hygroscopic, meaning they absorb moisture from the air. Too much moisture ruins the grind and the flavor. The MOPP layer keeps that from happening.
The middle layer is VMPET, or Vacuum Metalized Polyethylene Terephthalate. This is the real workhorse. During manufacturing, a thin layer of aluminum is deposited onto PET film in a vacuum chamber. This creates an almost perfect barrier against oxygen and light. Coffee oils oxidize when exposed to oxygen, turning rancid and losing their complex flavors. Light, especially sunlight, can also break down those delicate oils. The VMPET layer stops both.
The inner layer is PE, or Polyethylene. This is the part that touches the coffee. It's food-safe and approved by FDA and EU regulations. It also creates the seals. When heat is applied during pouch forming, the PE layers from both sides melt together, creating a strong, airtight bond. No leaks, no weak spots.Together, these three layers create a package that keeps coffee fresh for months, not weeks.