Study on Optical Properties of Microstructure of Lightguiding Plate for Micro Injection Molding and Micro Injection-Compression Molding

Shen, Yung Kang; Chang, H.J.; Lin, Chi‐Chin

doi:10.4028/www.scientific.net/msf.505-507.229

Cited by 6 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After a preset amount of polymer melt is fed into an open cavity, it is compressed by a uniform force. The primary advantage of this process is the ability to produce dimensionally stable and relatively stress-free parts [6]. However, the thin-walled parts are easily broken if the post-compression force is not controlled well.…”

Section: Introductionmentioning

confidence: 99%

Polymeric nanofeatures of 100 nm using injection moulding for replication

Huang¹

2007

J. Micromech. Microeng.

View full text Add to dashboard Cite

The filling efficiency of replicated nanofeatures made with polymers using injection moulding with various moulding factors was investigated. Two simple calibration gratings with nanofeatures of 105 nm and 130 nm, respectively, were used as mould inserts to replicate nanofeatures by means of a custom-made injection machine. Nanofeatures made with polypropylene (PP), polystyrene (PS), polycarbonate (PC) and polymethylmethacrylate (PMMA) were tested because of differing viscosities and shrinkages in polymers. The results show that the surface configuration of the polymeric nanofeatures with low melt viscosity could be moulded well, while nanofeatures with high melt viscosity exhibited higher tolerance in depth. However, the moulding depth of nanofeatures could be effectively improved when mould temperature and forming pressure were higher. It was found that the reproducibility of the nanofeatures in large numbers could be replicated well after melt and mould temperatures became stable during moulding.

show abstract

Section: Introductionmentioning

confidence: 99%

Polymeric nanofeatures of 100 nm using injection moulding for replication

Huang¹

2007

J. Micromech. Microeng.

View full text Add to dashboard Cite

show abstract

“…flexibility and so on [1,2,7]. Recently, there has been increasing interest in the μ-ICM process, which combines μ-IM and hot embossing, for replicating optic parts and microfeatures [8][9][10][11][12][13][14][15]. Improved replication accuracy was found on the μ-ICM parts compared with μ-IM ones [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Manipulation and online monitoring of micro-replication quality during injection-compression molding

Guan¹,

Huang²,

Wu³

2012

J. Micromech. Microeng.

View full text Add to dashboard Cite

The accurate and rapid replication of micro-/nano-features with a high aspect ratio (AR) is one of the main challenges in micro-molding. In this work, the micro-injection-compression molding (μ-ICM) process and a new monitoring technique were combined to replicate micro-features with controllable and detectable ARs. Using a surface strain sensor mounted on the external surface of the mold, indirect acquisition of accurate cavity pressure during post-filling was realized, based on the specific pressure distribution on the mold predicted by the Hele-Shaw flow simulation. The feasibility of the proposed measuring technique was verified both numerically via finite-element analysis for the mold strain and experimentally by comparing cavity pressure profiles acquired directly and indirectly. Furthermore, primarily dominated by the maximum cavity pressure appearing during post-filling, the AR of molded polystyrene micro-feature in the downstream of cavity could be monitored via this technique with certain accuracy, and controlled by manipulating the compression force. Also the qualitative AR results of the other upstream micro-features were detectable in μ-ICM. Within a cycle time of 26 s, a maximum AR of about 12.1 was achieved on micro-features, indicating the potential for the mass production of complex micro parts applying μ-ICM.

show abstract

Assessment of replication fidelity of optical microstructures by hot embossing

Cirino

Granado

Mohammed‐Brahim

et al. 2016

Int J Adv Manuf Technol

View full text Add to dashboard Cite

International audienceThis work reports the performance evaluation of low-cost hot embossing processes of fine three-dimensional microstructures, namely (i) cylindrical microlens array, (ii) plano-convex aspheric Fresnel lens, and (iii) pyramidal array structures. All those optical elements were replicated by employing a low-cost hot embossing tool in optical quality acrylic material. Scanning electron microscopy and optical interference microscopy techniques were used to quantitatively measure the obtained structures. In terms of the replication fidelity with respect to the mold counterpart, the resulting optical elements presented at least 96 % of dimensional fidelity at micro- and nanometer scale, including the structures with sharp edges present in the Fresnel lens. In terms of the surface optical quality, resulting root mean square surface roughness of at least one tenth of wavelength was obtained, considering applications in the visible range of spectrum. The results showed that even nanostructures generated by the material removal mechanisms during mold fabrication, such as crystal grain elastic recovery, were well replicated with differences in the range of few of nanometers which is within the vertical resolution of the employed optical interference technique

show abstract

Study on Optical Properties of Microstructure of Lightguiding Plate for Micro Injection Molding and Micro Injection-Compression Molding

Cited by 6 publications

References 5 publications

Polymeric nanofeatures of 100 nm using injection moulding for replication

Polymeric nanofeatures of 100 nm using injection moulding for replication

Manipulation and online monitoring of micro-replication quality during injection-compression molding

Assessment of replication fidelity of optical microstructures by hot embossing

Contact Info

Product

Resources

About