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HDPE is known for its high strength-to-density ratio. [4] The density of HDPE ranges from 930 to 970 kg/m 3. [5] Although the density of HDPE is only marginally higher than that of low-density polyethylene, HDPE has little branching, giving it stronger intermolecular forces and tensile strength (38 MPa versus 21 MPa) than LDPE. [6]
Ultra-high-molecular-weight polyethylene (UHMWPE, UHMW) is a subset of the thermoplastic polyethylene.Also known as high-modulus polyethylene (HMPE), it has extremely long chains, with a molecular mass usually between 3.5 and 7.5 million amu. [1]
Wooden boxes are also used for bulk packaging; boxes made of aluminum and steel are common in heavy industry. Reusable plastic totes (molded or corrugated plastic) are used for some products and logistics chains. For some products, inner plastic liners or bin bags are used to protect the contents. Sealed inner bags with integral valves are ...
Many plastic closures are made by injection molding. [6] Many closures need to have the ability to adjust to slight manufacturing variation in the container and the closure structure. Some closures are made of flexible material such as cork, rubber, or plastic foam. Often an o-ring or a closure liner (gasket made of pulp or foam cap liner) is ...
Since 2008, Japan has increased plastic recycling, but still has a large amount of plastic wrapping which goes to waste. Plastic recycling in Japan is a potential US$90 billion market. [26] It is possible to rapidly convert polyethylene to hydrogen and graphene by heating. The energy needed is much less than for producing hydrogen by electrolysis.
The principles of shelf-ready packaging are almost universal. Not all retailers have identical requirements. For example, Costcos "Structural Packaging Specifications", [11] Target's "Shelf Ready and Transit Packaging Standards, Hardgoods", [12] and Walmart's "RRP and PDQ Display Standard Style Guide" [13] are similar but not identical.
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