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A closure may be a cap, cover, lid, plug, liner, or the like. [1] The part of the container to which the closure is applied is called the finish. [2] Other types of containers such as boxes and drums may also have closures but are not discussed in this article. Many containers and packages require a means of closing, which can be a separate ...
It is estimated that 3.4 billion tonnes of plastic packaging were created between 1950 and 2017. [1] Most plastic packaging is disposed of within a relatively short time. Discarded packaging accounts for 46% (158 million tonnes) of total annual plastic waste generation. Most plastic packaging waste is estimated to come from household waste.
The first use of plastics was the lunch box handle, but later spread to the entire box, with the first molded plastic boxes produced during the 1960s. Vinyl lunch boxes debuted in 1959. During the 1960s, the lunch box had few changes. The vacuum bottle included in them, however, steadily evolved during the course of the decade and into the 1970s.
Many plastic containers have built in handles. Plastic shipping containers and storage tubs often have handles moulded into them. Consumer blow moulded containers often have integral handles or are shaped to facilitate grasping. [18] [19] Hot water bottles often have a handle or hole for hanging.
Lids can be designed to sit flat against the rim of the associated vessel, to seal the rim, or to cover the rim from the outside. They may have handles to facilitate removal, particularly if intended for use with cooking vessels. [25] Lids can be attached or detached; attached lids have been promoted as a means of addressing plastic pollution. [26]
The term "waterproof" refers to conformance to a governing specification [1] and specific conditions of a laboratory test method. They are usually natural or synthetic fabrics that are laminated or coated with a waterproofing material such as wax , rubber , polyvinyl chloride (PVC), polyurethane (PU), silicone elastomer , or fluoropolymers .
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