scholarly journals Fundamental Study of Parts Detachment Mechanism from Wasted Printed Circuit Boards in Agitation Mill

2012 ◽  
Vol 59 (1) ◽  
pp. 27-32
Author(s):  
Chiharu TOKORO ◽  
Yuki TSUNAZAWA ◽  
Nozomi TSUSAKA ◽  
Kazuki TAHARA ◽  
Shuji OWADA
Keyword(s):  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Fundamental Study ◽  
Printed Circuit

A Study of Liberation and Separation Process of Metals from Printed Circuit Boards (PCBs) Scraps

2013 ◽  
Vol 594-595 ◽  
pp. 123-127
Author(s):  
Aimi Noorliyana Hashim ◽  
Kasmuin Mohd Zaheruddin ◽  
Hussin Kamarudin
Keyword(s):  
Rare Earth ◽  
Magnetic Particles ◽  
Printed Circuit Boards ◽  
Ceramic Materials ◽  
Circuit Boards ◽  
Metallic Elements ◽  
Fundamental Study ◽  
Magnetic Separator ◽  
Printed Circuit ◽  
Pre Treatment

Since the metallic elements are covered with or encapsulated by various plastic or ceramic materials on printed circuit boards (PCBs), a pre-treatment process allowing their liberation and separation is first needed in order to facilitate proficient extraction. In this work, a fundamental study has been carried out to recover metallic concentrates from PCBs scraps. The most important step is to separate or release particles from the associated gangue minerals at the possible liberation particle size. The samples of printed circuit boards were separated into the magnetic and non-magnetic fractions by Rare-earth Roll Magnetic Separator. Then, the magnetic and non-magnetic fractions were separated to heavy fraction (metallic elements) and light fraction (plastic) by Mozley Laboratory Table Separator. Results show that the unliberated particles still remain in the comminution fines PCBs. The use of Rare-earth roll magnetic separation was clarified that the Fe, Ni and Zn element tend to be condensed in magnetic particles. Meanwhile Cu element tends to be release in non-magnetic particles. Mozley Laboratory Table Separation was capable to obtain fractions with relatively high concentrations of metallic elements. This study is expected to provide useful data for the efficient physical separation of metallic components from printed circuit boards scraps.

Slit Effect of Common Ground Patterns in Affecting Cross-Talk Noise between Two Parallel Signal Traces on Printed Circuit Boards

2008 ◽  
Vol 128 (11) ◽  
pp. 657-662 ◽  
Author(s):  
Tsuyoshi Maeno ◽  
Yukihiko Sakurai ◽  
Takanori Unou ◽  
Kouji Ichikawa ◽  
Osamu Fujiwara
Keyword(s):  
Cross Talk ◽  
Printed Circuit Boards ◽  
Common Ground ◽  
Circuit Boards ◽  
Printed Circuit

Influence of Component Mounting Density on Oscillating Characteristics of Multilayer Printed Circuit Boards

2018 ◽  
Vol 23 (2) ◽  
pp. 141-148
Author(s):  
S.Sh. Rekhviashvili ◽  
◽  
M.O. Mamchuev ◽  
V.V. Narozhnov ◽  
M.M. Oshkhunov ◽  
...  
Keyword(s):  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Oscillating Characteristics

Noise properties of thin-film Ni-P resistors embedded in printed circuit boards

2013 ◽  
Vol 61 (3) ◽  
pp. 731-735
Author(s):  
A.W. Stadler ◽  
Z. Zawiślak ◽  
W. Stęplewski ◽  
A. Dziedzic
Keyword(s):  
Thin Film ◽  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Noise Component ◽  
Printed Circuit ◽  
Resistance Bridge ◽  
Different Types ◽  
Signal Path ◽  
Resistance Fluctuations ◽  
Made In

Abstract. Noise studies of planar thin-film Ni-P resistors made in/on Printed Circuit Boards, both covered with two different types of cladding or uncladded have been described. The resistors have been made of the resistive-conductive-material (Ohmega-Ply©) of 100 Ώ/sq. Noise of the selected pairs of samples has been measured in the DC resistance bridge with a transformer as the first stage in a signal path. 1/f noise caused by resistance fluctuations has been found to be the main noise component. Parameters describing noise properties of the resistors have been calculated and then compared with the parameters of other previously studied thin- and thick-film resistive materials.

LEACHING OF METALS FROM WASTE PRINTED CIRCUIT BOARDS (WPCBs) USING SULFURIC AND NITRIC ACIDS

2014 ◽  
Vol 13 (10) ◽  
pp. 2601-2607 ◽  
Author(s):  
Jae-chun Lee ◽  
Manoj Kumar ◽  
Min-Seuk Kim ◽  
Jinki Jeong ◽  
Kyoungkeun Yoo
Keyword(s):  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards
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