Abstract:

Micro-droplet inkjet belongs to the field of precision fluid dispensing technologies through producing micron grade droplets.The pneumatically diaphragm-driven drop-on-demand inkjet generator,produces micro-droplets by volumetric change of liquid chamber through deformation of diaphragm.Diaphragm and compressed gas pulse were used as driving element and driving source respectively.A mathematical model of jetting process of the pneumatic diaphragm actuator was carried out herein based on analyses of fluid-diaphragm coupling firstly.Secondly,the relationships between the input pneumatic pulse and internal pressure of chamber were attained.The model and calculation results may be used as theoretical basis for structure and control parameter optimization of  the jetting generator.Furthermore,controllable inkjet of viscous liquid was realized by the generator.Thus,the above research provides theoretical and experimental basis for practical applications of micro-droplet inkjet technology.

Key words: pneumatic diaphragm actuator, micro-droplet inkjet, drop-on-demand, satellite droplet

摘要：

微滴喷射是通过产生微米级的液滴实现流体按需精确喷射沉积成形的技术。气动膜片式微滴按需喷射装置的原理是以膜片为驱动部件，以压缩气体脉冲为驱动源，通过膜片的弹性变形实现液体腔的体积变化从而产生微液滴。通过建立驱动气压与液体腔内工作压力的关系，分析腔体内液体的流动状态，从而建立气动膜片式喷射系统的数学模型，以此作为优化装置结构和控制参数的依据。此外，利用该装置完成了黏性液体的可控喷射。研究结果为喷射制造的实际应用提供了理论与实验依据。
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关键词: 气动膜片式, 微液滴, 按需喷射, 卫星滴