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  2. Sprue (manufacturing) - Wikipedia

    en.wikipedia.org/wiki/Sprue_(manufacturing)

    The gate is the location at which the molten plastic enters the mold cavity and is often evidenced by a small nub or projection (the "gate mark") on the molded piece. Many scale-model kits are made from injection-molded plastic. Hobbyists typically remove the parts of a model kit from the runner using a sharp craft knife or razor saw. The ...

  3. Molding (process) - Wikipedia

    en.wikipedia.org/wiki/Molding_(process)

    A mold or mould is a hollowed-out block that is filled with a liquid or pliable material such as plastic, glass, metal, or ceramic raw material. [2] The liquid hardens or sets inside the mold, adopting its shape. A mold is a counterpart to a cast. The very common bi-valve molding process uses two molds, one for each half of the object.

  4. Injection moulding - Wikipedia

    en.wikipedia.org/wiki/Injection_moulding

    Injection moulding (U.S. spelling: injection molding) is a manufacturing process for producing parts by injecting molten material into a mould, or mold. Injection moulding can be performed with a host of materials mainly including metals (for which the process is called die-casting ), glasses , elastomers , confections , and most commonly ...

  5. Marine plastic pollution - Wikipedia

    en.wikipedia.org/wiki/Marine_plastic_pollution

    There is an estimated 15 to 51 trillion pieces of plastic amongst all of the world's oceans stretching from the top of ocean to the seafloor. [30] Oceans are Earth's deepest and most extensive basins with average depths of the abyssal plains being about 4 km beneath sea level.

  6. Blow molding - Wikipedia

    en.wikipedia.org/wiki/Blow_molding

    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 ...

  7. A Big Panic Over Tiny Plastics - AOL

    www.aol.com/news/big-panic-over-tiny-plastics...

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  8. Rotational molding - Wikipedia

    en.wikipedia.org/wiki/Rotational_molding

    The molten plastic will come into contact with the oxygen inside the mold. This can potentially lead to oxidation of the melted plastic and deterioration of the material's properties. For this reason, the chosen plastic must have a sufficient number of antioxidant molecules to prevent such degradation in its liquid state.

  9. Plastic pollution - Wikipedia

    en.wikipedia.org/wiki/Plastic_pollution

    In 2018 approximately 513 million tonnes of plastics wind up in the oceans every year out of which the 83,1% is from the following 20 countries: China is the most mismanaged plastic waste polluter leaving in the sea the 27.7% of the world total, second Indonesia with the 10.1%, third Philippines with 5.9%, fourth Vietnam with 5.8%, fifth Sri ...

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