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But if using reclaimed materials to replace the total carbon emissions would reduce 52.90%.
So an innovative technology of PP-R raw materials producing and using more reclaimed materials are the keys to cut down the carbon emissions of PP-R pipe.
Production and processing stage, as different manufacturers using reclaimed materials with different proportions, in order to make the process more clear, this study assumes that in this stage no reclaimed materials has been used.
Li: Journal of Basic Science and Engineering, Vol. 14 (2006) No.1, p.40
Wang: Journal of Northeast Normal University (Natural Science Edition), Vol. 43 (2011) No.4, p.33.

Materials Today Chemistry. 20 (2021) 100438
Journal of Materials Science: Materials in Electronics. 32, 9 (2021) 12164-12181
Journal of Materials Research. 37 (2022) 2396–2405
Journal of Science: Advanced Materials and Devices. 5 (2020) 185-191
Journal of Materials Research. 37 (2022) 2396-2405

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These became an opportunity for the engineer to seek a new acoustic materials or new methods to enhance the noise absorption and attenuation.
Some researchers [1-4] have developed new acoustics material using natural product for the noise absorber materials.
Beranek & Ver [11] use same idea to calculate the acoustic impedance of perforated plate backed with air cavity or porous materials.
Ismail and M.Z.: Journal of Applied Sciences.
[10] Bolt: Journal Acoust Soc Am.

Computational Materials Science, 2014, 86, 24-29
Materials Science Forum,2019,956:332-341
Materials Science Forum, 2019, 956: 46-54
Computational Materials Science, 2014, 83, 27-34
International Journal of Advanced Materials and Production, 2016, 1(1), 62-68

It is more severe if the bending is of small bending radii, thin wall thickness or lower ductility materials.
This makes laser bending is mostly suitable to thin wall or low ductility materials tube.
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These materials are widely used in modern engineering; however, the machining operations of these materials are associated with certain difficulties. [6].
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Gerald, The Mechanisms of Chip Formation in Machining Hardened Steels, Transactions of the ASME Journal of Manufacturing Science and Engineering 124 (3), pp. 528–535, 2002
Dolinsek, Tribology of Coated Tools in Conventional and HSC Machining, Journal of Materials Processing Technology 118 (2001), pp. 377–384
Production process of stainless and heat-resistant materials.

Pham, Investigation of Bacterial Attachment on Hydroxyapatite-Coated Titanium and Tantalum, International Journal of Surface Science and Engineering, 8 (2014) 255-263
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Waterfield, Effect of Titanium Surface Topography on Macrophage Activation and Secretion of Proinflammatory Cytokines and Chemokines, Journal of Biomedical Materials Research, 70A (2004) 194-205
Li Bioactivities of a Ti Surface Ablated with a Femtosecond Laser through Sbf, Biomedical Materials, 5 (2010) 054115
Chen, Nanocrystalline materials and coatings, Materials Science and Engineering: R: Reports, 45 (2004) 1-88

Duszczyk: Journal of Materials Processing Technology, Vol. 114 (2001) No.2, p.145-153
Wu: Journal of Materials Processing Technology, Vol. 206 (2008) No.1-3, p.481-490
Svendsen: Journal of Materials Processing Technology, Vol. 209 (2009) No.2, p.876-883
Misiolek: Journal of Materials Processing Technology, Vol. 60 (1996) No.1-4, p.117-124
Buijk: Journal of Materials Processing Technology, Vol. 113 (2001) No.1-3, p.93-97