08/05/2022
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Rubbish Bin using what plastic material??
Material used to manufacture the recycling bin is the most important factor. Different types of plastic (polyethylene, polypropylene, polystyrene) have several varying grades and forms. Each grade and form is suited to a specific type of manufacturing and end product and each type of plastic carries different physical and chemical properties. For example, polyethylene is a type of plastic that includes low-density, medium-density and high-density grades. High-density polyethylene is best suited for manufacturing injection molded containers for outdoor uses.
Two types of plastic are generally used to manufacture a curbside recycling bin: polyethylene or polypropylene. The most commonly used of these is high-density polyethylene (HDPE). This plastic material is the most popular choice for these containers because of its rigid state, high impact resistance and durability against the elements. A common misconception is that if something is flexible, it is more likely to break compared to an item that seems more rigid. The opposite is actually true; the more flexible the plastic, the more durable and resistant to stress it is. It has a higher capability to ‘bounce back’ when stress is applied rather than breaking under the stress.
So why is polypropylene still used in the manufacturing of curbside recycle bins if it is not as sturdy and durable as polyethylene? There are two reasons why some manufacturers use this type of plastic: it is historically cheaper and there is the ability to use more post-consumer recycled material. Purchasing policies have shifted to a sustainable model so more emphasis has been placed on purchasing products that contain high percentages of recycled content. When purchasing curbside recycling containers, there has been a high demand in sourcing bins that have the highest percentage of post-consumer recycled content. Post-consumer materials are materials that are collected through curbside recycling programs such as plastics bottles and containers some of them are made from high density polyethylene (HDPE) and some from polypropylene (PP). The issue lies in the type of HDPE that is used to manufacture plastic bottles for consumer use since it is a fractional melt high density used in blow molding (a common manufacturing process for small plastic containers). This fractional melt high-density is not usable in most injection molding, and especially not for large curbside recycle bins.
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