Vest bags, also known as vest-style bags, are a common type of plastic bag named for their shape, which resembles a vest. They are simple to produce and widely used, making them an indispensable necessity in daily life, providing great convenience.
Plastic vest bags are the most common in people's daily lives, and they are known by different names in various regions, such as vest bags, convenience bags, or advertising bags. Vest bags are widely used in shopping malls, supermarkets, convenience stores, wholesale markets, and other places, with enormous consumption, which has also led to long-term impacts on the ecological environment.
Vest bags are mostly made of high-density polyethylene (HDPE), which is a relatively hard material. High-density polyethylene is a thermoplastic resin with high crystallinity and non-polarity. In its natural state, HDPE appears milky white and is somewhat translucent in thin sections. PE has excellent resistance to most chemicals used in daily life and industry. Certain types of chemicals can cause chemical corrosion, such as corrosive oxidants, aromatic hydrocarbons (xylene), and halogenated hydrocarbons. This polymer is non-hygroscopic and has good water vapor barrier properties, making it suitable for packaging applications. HDPE has excellent electrical properties, particularly high dielectric strength, making it very suitable for wires and cables. Medium to high molecular weight grades have excellent impact resistance, even at room temperature or low temperatures.