Since it is difficult to control the etched depths, this method has some disadvantages including difficulties to produce uniform molds, irregular light dispersion, and ejection problems caused by over-etching.(c)Mechanical machining : This method Fluoro-Sorafenib uses machine tools to form micro grooves read FAQ on a flat type LGP. Brightness can be controlled by the groove density on the LGP. Grooves can be machined either Inhibitors,Modulators,Libraries on the LGP directly or on a mold. While this method can deliver high brightness, long machining Inhibitors,Modulators,Libraries time is required. Other drawbacks are that groove depth control is difficult due to tool wear and deformation can occur due to applied mechanical force.(d)Injection using abrasive jet machined mold : This method adopts micro abrasive jet machining techniques to form patterns on the LGP mold.

Several research results have been reported for limited cases; however, only a few practical application cases have been reported thus far. This method is expected to offer high Inhibitors,Modulators,Libraries productivity.3.?Mold machining process conditions3.1. Machining properties of micro powder blastingMachining properties of micro powder blasting are Inhibitors,Modulators,Libraries similar Inhibitors,Modulators,Libraries to those of abrasive jet machining methods. Powder blasting is regarded as a mechanical etching process. In this process, micro abrasives(tens of ��m) are accelerated by highly compressed air or gases, and collide with the workpiece with very high velocity(80 �C 200m/s). Thus, this Inhibitors,Modulators,Libraries process can be Inhibitors,Modulators,Libraries employed to perform micromachining by the integration of brittle mode fractures based on micro crack propagation.

Brefeldin_A Inhibitors,Modulators,Libraries Material removal can be performed by scanning the blasting nozzle along pre-defined paths on the workpiece covered with a photoresist film. Since the machined workpiece shape can be determined by the mask pattern, very complex and/or micro shapes can be easily obtained. The main parameters used to define the powder blasting process are blasting pressure, Drug_discovery blasting velocity, material properties, size and density of the abrasives, number of iterations and velocity of the nozzle scanning and standoff distance between the nozzle and workpiece, etc.3.2. Applied machining processThe overall fabrication process for a LGP mold with micro pattern using powder blasting is illustrated in Figure 2.

Prior to this process, pattern design and pattern mask making processes are required. Through the masking process, mold regions to be removed by the powder blasting are determined.

Finally, the desired micro dot pattern forming injection selleck catalog mold for the LGP can be obtained after the powder blasting and cleaning processes.Figure only 2.Overall fabrication process for a LGP moldIn this study, optimum masking conditions are determined based on experimental results. The thickness of the used mask film is 40��m(BF704, Ordyl, Japan), and the applied laminating temperature is maintained at 80��C. The exposure is 250mJ using a parallel UV beam, and developing is performed with a 5% NaCO3 solution and a 15 minute softbaking process is followed.