Yin-Yang bags are also called visible bags. Their characteristics are that one side is a transparent film and the other side is an opaque film such as aluminized or aluminum foil. Due to the different effects on the front and back, the composite materials used are also different. It has the following advantages:
(1) Light weight helps reduce transportation costs.
(2) It has good insulation and light-shielding properties. It is moisture-proof, airtight, and has fragrance-retaining properties, which can prevent the packaging from absorbing moisture, oxidizing, and volatilizing and deteriorating.
(3) It has excellent heat resistance, its shape is stable at high and low temperatures, and it can be used as a baking container.
(4) Strong protection: It makes the packaging less susceptible to damage by bacteria, mold and insects.