包装材料ガイド: PET Film

Question 1

What is PET film used for in flexible packaging?

Accepted Answer

PET (polyester) film is commonly used as the outer printable layer in laminated flexible packaging. It provides high stiffness, dimensional stability, good print surface and heat resistance for gravure printing and pouch making.

Question 2

Why is PET film used as an outer layer?

Accepted Answer

PET offers excellent print quality, stiffness and heat resistance. It supports the laminated structure during printing, lamination and pouch forming. It is commonly paired with PE, CPP, VMPET or aluminum foil inner layers.

Question 3

Is PET film suitable for food contact?

Accepted Answer

PET is typically used as the outer layer (non-food-contact side) in laminated structures. The food contact layer is usually PE or CPP. The overall structure must meet food safety requirements for the intended application.

Question 4

Can PET film be used for retort packaging?

Accepted Answer

Standard PET may not withstand retort temperatures above 121 degrees C. Retort-grade PET or other high-temperature resistant outer layers should be reviewed for retort applications.

Question 5

What information is needed before quoting PET-based packaging?

Accepted Answer

Product type, bag size or roll width, material structure, thickness, printing colors, artwork file, shelf life requirement and target market requirement.