Materials and micro drilling of high frequency and high speed printed circuit board: a review

Shi, Huaizhong; Xian-wen, Liu; Lou, Yan Yan

doi:10.1007/s00170-018-2711-5

Cited by 58 publications

(31 citation statements)

References 38 publications

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“…Epoxy value is defined as the moles of epoxy groups per 100 g of epoxy resin, and was determined by titration with hydrochloric acid-acetone method. 1 H-NMR spectra were obtained by the AV III HD 400 MHz Bruker instrument, using chloroform-d as the solvent and tetramethylsilane as the standard. FTIR spectra were measured by Nicolet IS spectrometer with potassium bromide (KBr) pellets at room temperature.…”

Section: Characterization and Measurementmentioning

confidence: 99%

“…The yield based on fluorobenzene was 72.9%. 1 In order to reduce the formation of oligomer, the excess epichlorohydrin was added. The reaction mixture was stirred at 110 C for 12 h. The obtained mixture was filtered to remove the formed sodium chloride, and the filtrate was distilled under reduced pressure to remove the excess epichlorohydrin.…”

Section: Introductionmentioning

confidence: 99%

“…The degree of polymerization (DP) will be discussed through the measured epoxy value in the following. 1 The FB-EP and BADGE epoxies were cured with HHPA and BF 3 MEA, respectively. The chemical structure of used epoxies and additives are shown in Table 1.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and properties of a fluorinated epoxy resin with low dielectric constant

Chen

Wang

2022

J of Applied Polymer Sci

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Demand for electronic materials with improved dielectric properties are increasing. One of the ways to reduce the dielectric constant is to incorporate fluorine atoms. In this article, a novel fluorinated epoxy resin (diglycidol ether of 2,4‐bis (1,1,1,3,3,3‐hexafluoroisopropyl) fluorobenzene (FB‐EP)) with 45.7 wt% fluorine content was synthesized from fluorobenzene, epichlorohydrin and hexafluoroacetone. The structures of desired monomers were characterized by NMR and FTIR. The epoxy resin FB‐EP was cured by copolymerization with hexahydrophthalic anhydride (HHPA) and by homopolymerization catalyzed with boron trifluoride ethylamine (BF3MEA), respectively. The curing reaction kinetics of the fluorinated epoxy and the properties of the cured materials were studied in comparison with those of common diglycidol ether epoxy resin (BADGE). The results of curing activation energy indicate that FB‐EP is reactive as the BADGE, and the four‐trifluoromethyl groups on FB‐EP do not negatively affect the cationic polymerization reactivity of the epoxy groups. The cured FB‐EP materials had lower moisture absorption, and especially lower dielectric constant (Dk, 2.23) and lower dielectric loss (Df, 0.011) in the frequency range of 8.2–12.4 GHz. This article provides a base for further study of fluorinated epoxy resin as advanced electronic materials.

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Section: Characterization and Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation and properties of a fluorinated epoxy resin with low dielectric constant

Chen

Wang

2022

J of Applied Polymer Sci

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“…And the small drills (Φ0.1~0.3mm) with high rotating speed (≥10000rpm) are used for the hole drilling on the PCB substrates of fiber-reinforced laminated composite materials. The combination of composite material, small drill, and high rotating and feeding speed easily leads to tool wear, which gradually deteriorates the drilling quality [2,3]. The online tool wear monitoring has particular significance for the hole drilling quality of PCB before severe breakage of tool occurs [4,5].…”

Section: Introductionmentioning

confidence: 99%

Weak signal enhancement for small drill condition monitoring in PCB drilling process by using adaptive multistable stochastic resonance

Tan

Liu

et al. 2022

Int J Adv Manuf Technol

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The on-line tool condition monitoring is demanded to detect the tool wear and to ensure the hole drilling process of printed circuit boards (PCB) goes on smoothly. However, due to the impact of ambient noise caused by the limited size of small drill and the laminated material of PCB, the tool wear signal features are too weak to extract. The stochastic resonance (SR) method has been proven to be effective in enhancing weak signals among various weak signal extraction. In this paper, an adaptive multistable stochastic resonance is presented to improve performance of the SR method and process the tool wear signals for PCB drilling. The differential evolution (DE) algorithm is applied to adaptively optimize potential parameters and compensation factor, which makes the SR method suitable for high frequency signal. Moreover, tool wear experiments with different drill wear are carried out to verify the effectiveness of the proposed method. The results indicate that the proposed method improves the signalto-noise ratio and has great potential in enhancing weak signals for small drill condition monitoring in PCB drilling process.

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“…With the improvement and application of the 5G communication technology, the diameter and density of micro hole in printed circuit boards are getting smaller and smaller [1]. During the process of PCB micro hole drilling, drilling force is a critical factor affecting the quality of micro hole forming and drill bit breakage.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Printed Circuit Board Micro-Holes Drilling Process by Accurate Analysis of Drilling Force Signal

Tao

Gao

Shi

2021

Int. J. Precis. Eng. Manuf.

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Drilling force directly affects the micro drill life and micro hole quality in the micro hole drilling of printed circuit board (PCB). But in the micro hole drilling process, the signal-to-noise ratio (SNR) of drilling force signal is low. Drilling force signal often submerged by noise signal, these brings great difficulty to measurement during PCB drilling process. Therefore, it is urgent to improve the SNR of drilling force signal in PCB drilling process. The observed signal of drilling force is obtained by PCB micro hole drilling experiment. Based on the cyclostationary and time domain accumulation theory, the drilling force signal is quadratic filtered, and the filtering effect of the filter on the drilling force signal is evaluated. In this paper, a composite multiple filter is designed to improve the SNR of drilling force signal rapidly and efficiently (SNR increased by 11.76 dB), realize the accurate description of the PCB micro hole drilling process.

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Materials and micro drilling of high frequency and high speed printed circuit board: a review

Cited by 58 publications

References 38 publications

Preparation and properties of a fluorinated epoxy resin with low dielectric constant

Preparation and properties of a fluorinated epoxy resin with low dielectric constant

Weak signal enhancement for small drill condition monitoring in PCB drilling process by using adaptive multistable stochastic resonance

Characterization of Printed Circuit Board Micro-Holes Drilling Process by Accurate Analysis of Drilling Force Signal

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