2．显微注塑
光碟( CD )是显微注塑产品， 但是,它的微观结构和高宽比约由10到目前的600 。 因此,进一步发展机械及其工艺是很有必要的 。常见的注塑成型参数,如相对较低的模具温度和注射压力使微结构模具产生了缺陷。 因此，显微注塑必须进行高模具温度，非晶态热塑性树脂(如PMMA和PC,PSU )这些温度高于玻璃化转变温度，半结晶热塑性树脂(如聚甲醛, PA )往往达到微晶的熔点， 在大多数情况下, 在注塑喷头的塑料温度几乎相当于最高温加工的热塑性塑料， 此前拆模, 双方成型和注塑成型模具都要降温了，在所有的显微造型工艺中, 模具只是填补拆模后的温度，事先完全疏散型腔,因为传统的排气腔途经分型面或空白部分是不可能的,显微模具刀片填补了这一缺陷。因此, 机器周边包括某一真空机组为撤离的型腔模具充当了良好的温度控制装置。
Injection molding and related techniques for fabrication of microstructures
Abstract. Injection molding technology and its different modifications represent established processes for manufacturing polymer products with high accuracy in large scale production. Enhanced machine and tool technologies like evacuation units and special temperization systems have already been adapted to the molding of microstructures with high aspect ratios. Cycle times are actually in the range of minutes and depend on the geometry of the microstructures and the materials used. Based on injection molding of lost plastic microforms new processes for the manufacturing of ceramic or metal microstructures are being developed.
Keywords. related techniques; microstructures; Injection molding
1．Introduction
The essential condition for market success of microsystems is the cost-effective production of microstructures in large scales. Injection molding of polymer materials is a suitable process technology for large scale fabrication achieving high precision standards. Therefore micro injection molding based on modified machine technology is applied for manufacturing of microstructures in larger scale series. Duroplastics and elastomers are processed by reaction injection molding. Additionally hot embossing is used for production of smaller scale series and is under development for aligned molding in case of movable LIGA microstructures [12].
