Plastic Bags

Plastic bags are versatile and flexible containers that are made of a thin polymeric film. They are sometimes referred to as poly bags and are usually fabricated from polymer resins. and that are used to package, ship, and transport numerous goods for a vast array of residential, industrial, and commercial applications. Plastic bags are ideal for these applications because they are capable of protecting its contents from water and other elements.

Other materials can be used to create plastic bags, such as polyethylene, polypropylene, and vinyl. Medical plastic bags and shopping bags are commonly made from these materials. Since plastic bags can be used for so many applications, the different varieties of plastic bags have little else in common besides the basic materials from which they are made.

Depending on the intended use of the bag, they can vary in style, closure, shape, color, and size. For example, clear plastic bags are often used for merchandise, because they allow consumers to see the bag’s contents before purchasing them. Some bags such as zip-lock bags are re-sealable, thus enabling consumers to use the bags more than once.

These factors are determined in the manufacturing process, while other features such as printing are decided in post-production to ensure all of the application’s requirements are met. Read More…

Leading Manufacturers

Multi-Pak USA, Inc.

Dacula, GA | 800-229-9950

Custom Poly Packaging

Fort Wayne, IN | 800-548-6603

Four Star Plastics

Beltsville, MD | 888-999-7961

Champion Plastics

Clifton, NJ | 800-526-1230

Dana Poly Inc.

Dover, NJ | 908-474-0600

Packateers, Inc.

West Chester, PA | 610-436-4750

Associated Bag

Milwaukee, WI | 800-926-6100


Many industries and applications use plastic bags extensively in their daily operations because of the bags’ flexible, rigid, durable, and tear-away properties. They use plastic bags for the purposes of storing various materials, parts, and components, as plastic bags can protect them against different environmental contaminants such as moisture.

Some types of plastic bags may not hold up as well against elements such as heat or UV light, but others are more capable of withstanding the elements and can last extended periods of time. The latter type of plastic bags are used in applications where sterilization is crucial, such as packaging medical supplies, food, biological materials, and chemicals.

Industries such as chemical, electronic, construction, automotive, sanitation, storage, retail, and pharmaceutical take full advantage of the benefits that plastic bags have to offer, especially since the production of any containers made of plastic cost significantly less than other materials such as metal.

Aside from large industries, plastic bags can be frequently found in households and office spaces. While the purposes for plastic bags can greatly vary, their primary purpose is to store and protect various goods.

Plastic bags are fabricated using a large amount of materials in order to accommodate for the growing number of applications for which plastic bags are used. The word “plastic” can be defined as a material that is derived from polymer resins. A polymer is a long sequence of molecules that consist of a group of smaller monomers.

These monomers are held together by covalent bonds. This type of composition can apply to various types of plastic, whether they are organic, natural, or synthetic. The two main polymers that are most commonly used in plastic bag production are polyethylene and polypropylene. Both of these polymers are thermoplastics, and they are both lightweight and durable.

Another popular type of plastic is vinyl, made from a polymer called polyvinyl chloride. Vinyl bags are more rugged than the previous two types of plastic, and are thus better suited for rougher applications such as storage. Specific design requirements are a necessary step in plastic bag manufacturing, especially since bags that are used for harsher applications and environments require reliable sealing capabilities. The film encasement of the bag is made by way of blown film extrusion, sheet extrusion, winding, or casting.

Polymer resin is melted into a viscous liquid, and it is then extruded through a die, which produces a plastic tube. Cool air is then forced through the die’s center, creating a bubble. After the material is cooled, it may undergo additional treatments. Then, the seams of the bag are either glued, heat-sealed, or stitched in place.

The type of material and the type of treatment are both important factors to consider in manufacturing a plastic bag. However, these are not the only factors. Another factor is the bag’s size. A bag’s size must be appropriate for its intended application, since the size can vary anywhere from several to several hundred cubic inches. The area of the bag is decided by multiplying the length by the height by the width. The dimensions must be carefully considered in addition to the volume, especially in dealing with items that are irregular in shape.

Additionally, one must consider the bag’s style, the type of closure, and the overall production cost. Finally, the recyclability of the bag must be carefully considered due to increased mindfulness of the environment. In the U.S. alone, 80% of grocery bags are plastic, but the ratio of consumer plastic that is recycled are less than 0.5%.

The development of biodegradable polymers have led to an increase in use of reusable plastic bags in multiple industries. Because plastic bags are so versatile in terms of composition and application, consumers have a variety to choose from, but this variety ensures that the consumer’s exact needs will be met.

Plastic Bag Informational Video