Nonuniform Heating Method for Hot Embossing of Polymers with Multiscale Microstructures

Chang, Chih-Yuan

doi:10.3390/polym13030337

Cited by 3 publications

(1 citation statement)

References 36 publications

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“…Micro-embossing is a conventional nanofabrication process that combines pressing with heating to transfer nanopatterns from a master mold to another material [ 41 , 42 , 43 ]. However, this method has weaknesses, such as applying an excessive pressing load will cause master mold to break [ 44 , 45 ].…”

Section: Discussionmentioning

confidence: 99%

Fabrication of Nanogroove Arrays on Acrylic Film Using Micro-Embossing Technique

Raksiri,

Potejanasak,

Dokyor

2023

Polymers

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The fabrication of nanostructures is of great importance in producing biomedical devices. Significantly, the nanostructure of the polymeric film has a significant impact on the physical and biophysical behavior of the biomolecules. This study presents an efficient nanofabrication method of nanogroove structures on an acrylic film by the micro-embossing process. In this method, a master mold was made from a thermos oxide silicon substrate using photolithography and etching techniques. An isotropic optical polymethyl methacrylate (PMMA) film is used in the experiment. The acrylic film is known for its excellent optical properties in products such as optical lenses, medical devices, and various general purpose engineering plastics. Then, the micro-embossing process was realized to fabricate nanogroove patterns on an acrylic film by using a micro-embossing machine. However, the morphology of the nanopatterns on an acrylic film was characterized by using an atomic force microscope to measure the dimensions of the nanogroove patterns. The impact of embossing temperature on the morphology of nanogroove patterns on acrylic film is experimentally investigated. The results show that when the embossing temperature is too small, the pattern is not fully formed, and slipping occurs in nanopatterns on the acrylic film. On the other hand, the effect of increasing the embossing temperature on the morphology of nanogrooves agrees with the master mold, and the crests between the nanogrooves form straight edges. It should be noted that the micro-embossing temperature also strongly influences the transferability of nanopatterns on an acrylic film. The technique has great potential for rapidly fabricating nanostructure patterns on acrylic film.

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Section: Discussionmentioning

confidence: 99%

Fabrication of Nanogroove Arrays on Acrylic Film Using Micro-Embossing Technique

Raksiri,

Potejanasak,

Dokyor

2023

Polymers

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A low-cost and highly efficient method of reducing coolant leakage for direct metal printed injection mold with cooling channels using optimum heat treatment process procedures

Kuo

Qiu

Yang

2021

Int J Adv Manuf Technol

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Metal additive manufacturing (MAM) provides lots of bene ts and potentials in manufacturing molds or dies with sophisticated conformal cooling channels. It is known that the conformal cooling technology provides effective cooling to reduce cycle time for increasing productivity. Ordinarily, mold inserts fabricated by general printing procedures will result in coolant leakage in the injection molding process.The yield in the manufacturing of fully dense injection molding tools was limited to the very narrow working widow. In addition, high costs of fully dense injection mold fabricated by MAM constitute the major obstacle to its application in the mold or die industry. In general, the high cost of MAM is approximately 50-70% more expensive than conventional computer numerical control machining. In this study, a low-cost and highly e cient method of reducing coolant leakage for direct metal printed injection mold with cooling channels was proposed. This new method employs general process parameters to manufacture the green injection mold rapidly and then uses optimum heat treatment (HT) procedures to improve microstructure of the green injection mold. The results of this study revealed that optimum HT procedures can prevent coolant leakage and save manufacturing time of the injection mold fabricated by direct metal laser sintering. The evolution mechanisms of microstructure were investigated experimentally. The save in the injection mold manufacture time about 67% can be obtained.

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Parametric study of microlens array fabricated on polymer substrate through hot embossing with a micro-EDM mould and its optical characterisation

Deshmukh

Goswami

2022

Advances in Materials and Processing Technologies

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Nonuniform Heating Method for Hot Embossing of Polymers with Multiscale Microstructures

Cited by 3 publications

References 36 publications

Fabrication of Nanogroove Arrays on Acrylic Film Using Micro-Embossing Technique

Fabrication of Nanogroove Arrays on Acrylic Film Using Micro-Embossing Technique

A low-cost and highly efficient method of reducing coolant leakage for direct metal printed injection mold with cooling channels using optimum heat treatment process procedures

Parametric study of microlens array fabricated on polymer substrate through hot embossing with a micro-EDM mould and its optical characterisation

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