Final answer:
Low-density polyethylene (LDPE) is commonly used to make food storage bags due to its suitable properties for packaging, and it can be identified by the plastic identification code "4".
Step-by-step explanation:
The type of plastic manufacturing most likely to be used to make food storage bags is the production of polyethylene, particularly low-density polyethylene (LDPE). This kind of plastic is popular for its flexibility, durability, and clarity, which makes it ideal for creating food storage bags. The process involves the polymerization of ethylene to create the polyethylene resin, followed by blow molding or film blowing to produce thin films that are then fashioned into bags. LDPE can be identified by the plastic identification code (PIC) "4" and is widely used in various types of packaging, including take-out trays and thin-walled containers.
For instance, LDPE is chosen for its ability to efficiently pack together and hold different product types while also being lightweight and cost-effective. This material is commonly recycled and can be identified with recycling symbols, indicating whether the plastic can be reused for new products, thereby reducing environmental impact.