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The word plastic derives from the Ancient Greek πλαστικός (plastikos), meaning 'capable of being shaped or molded'; in turn, it is from πλαστός (plastos) meaning 'molded'. [10] As a noun , the word most commonly refers to the solid products of petrochemical-derived manufacturing.
Rice in a wooden tub Korean dosirak can be a tub-shaped thermos, that can be used as a lunchbox Tub of cottage cheese, lid, and lidding film. A tub is an open-top circular or oblong container. In earlier times they were made from wooden staves held together with iron hoops and were made by coopers. Modern tubs used in industry might be made ...
An object in the plastic deformation range, however, will first have undergone elastic deformation, which is undone simply be removing the applied force, so the object will return part way to its original shape. Soft thermoplastics have a rather large plastic deformation range as do ductile metals such as copper, silver, and gold.
Ductile materials can sustain large plastic deformations without fracture. However, even ductile metals will fracture when the strain becomes large enough—this is as a result of work hardening of the material, which causes it to become brittle. Heat treatment such as annealing can restore the ductility of a worked piece, so that shaping can ...
The plastic tube retains its shape after each squeeze unlike laminate tubes such as toothpaste tubes. Plastic tubes can be highly decorated or have a special additive such as soft touch to make the tube more appealing during use or at the point of sale. Plastic tubes are produced by extrusion. A sleeve is first produced on a specialised ...
Unlike most thermoplastics, polycarbonate can undergo large plastic deformations without cracking or breaking. As a result, it can be processed and formed at room temperature using sheet metal techniques, such as bending on a brake. Even for sharp angle bends with a tight radius, heating may not be necessary.
After the plastic has cooled, the mold is opened and the part is ejected. [2] "Straight extrusion blow molding is a way of propelling material forward similar to injection molding whereby an Archimedean screw turns, feeding plastic material down a heated tube. Once the plastic is melted the screw stops rotating and linearly moves to push the ...
A water bottle. Worldwide, 480 billions of plastic drinking bottles were sold in 2017 (and fewer than half were recycled). [1] A plastic bottle of antifreeze Large plastic bottles of water. A plastic bottle is a bottle constructed from high-density or low density plastic. Plastic bottles are typically used to store liquids such as water, soft ...
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