An Introduction to Reusable Polypropylene Shopping Bags

1. An Introduction to Reusable Polypropylene Shopping Bags Polypropylene bags are probably the most widely used type of reusable bags that serve many different applications, particularly in retail packaging. A PP woven bags manufacturer produces a wide variety of non-woven and woven polypropylene bags each with their own unique properties and characteristics, depending on their intended use. To understand the nature of these reusable shopping bags and packaging materials, it is best to know exactly what woven polypropylene bags are made of. A ​PP woven bags manufacturer​ makes use of polypropylene in order to produce durable and highly versatile PP bags. Polypropylene is a type of thermoplastic created in 1954. Today it is one of the top three most widely used polymers for production of various end products, not only because of its unique and beneficial properties, but also because it is less expensive to produce. Polypropylene belongs to a family of non-polar, partially crystalline polyolefins, with properties closely resembling those of polyethylene (PE), although polypropylene offers more heat resistance and is slightly harder than PE. This rugged material also boasts high chemical resistance, which is among the main reasons it is one of the most widely produced plastic commodities (next to PE) that finds great use in labeling and packaging applications. In many ways, polypropylene closely resembles polyethylene, especially when it comes to physical and chemical properties. PP is known to have enhanced thermal resistance and mechanical properties, although the chemical resistance isn’t quite as impressive. Mechanical properties and levels of thermal resistance largely depend on PP’s molecular weight, crystallinity, molecular weight distribution, isotacticity, as well as the type and percentage or proportion of comonomer when present. Woven polypropylene bags are commodity plastics that find great use in retail packaging and production applications. To produce PP bags, PP woven bags manufacturers melt polypropylene in order to make the material capable of being molded and extruded. Some common extrusion methods used in the production of ​woven polypropylene bags​ include spin bonding and melt blowing of fibers in order to create long rolls, which can then be used to fashion a range of woven products. Non-woven polypropylene products on the other hand, are shaped instead of extruded. Manufacturers use shaping techniques like injection molding, to form polypropylene into parts that can be used to manufacture various end products like plastic bags, cups, vials, cutlery, containers, caps, housewares, and even automotive parts. Other techniques include injection-stretch blow molding and typical blow molding.