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Development of Injection Molding of an High Density Optical Disk by Rapid Heating Stamper

快速加热压模高密度光盘注射成型的研制

基本信息

批准号：
07555217
负责人：
KATO Kazunori
金额：
$ 5.38万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

In injection molding of an optical disk, precise minute pit pattern is transcripted from that on a nickel stamper of 0.3mm thickness. However various defects, i.e.miss-transcription, multiple transcription, flow-mark, etc.are sometimes generated. These defects reduce with increasing die temperature, but cooling efficiency of a product decreases and molding cycle time become long. In this paper a model stamper, on which thin nickel film is plated and heated by direct current, is developed. Then, transcription behavior is examined. A rapid heating stamper model is made. Its size is 100mm in length, 10mm in width, and 5mm in thickness. A thin nickel layr of 10mum thickness is plated on AIN (aluminum nitride) ceramic plate and annealed at 400ﾟC temperature in 15 minutes. Then the surface is finished by buffing. Then Electrodes was put on its both ends and electric power of 10V and 12A is applied to the nikkel layr. Surface temperature is measured by thermo-couple. Temperature rise of 65ﾟC is obtained in 1.5 seconds after power-on and 50ﾟC temperature drop in 5 seconds after power-off. In injection molding with the model stamper, heat-starting time (t_0) and heat-holding tiem (DELTAt) are changed. "t_0=0" is defined as injection-starting time. On the surface of a stamper many fine scratches are observed. In injection molding without heating. transcription of scratch is not clear. It means that the transcription is incomplete. When appropriate heating is applied (t_0=-ls, DELTAt=2s), scratches are transcripted clearly. In the case of long heating (t_0=0s, DELTAt=3s), voids are generated because of high temperature.

在光盘的注射成型中，精确的微小凹坑图案是由0.3mm厚的镍冲压件上的凹坑图案转印而成的。但有时也会产生各种缺陷，如转录缺失、多重转录、流标记等。这些缺陷随着模具温度的升高而减少，但产品的冷却效率降低，成型周期变长。本文研制了一种用直流电加热镀镍薄膜的冲压模。然后，研究转录行为。制作了快速加热冲压模具模型。它的尺寸是长100毫米，宽10毫米，厚5毫米。在氮化铝（AIN）陶瓷板上镀上一层厚度为10mum的薄镍层，在400℃的温度下退火15分钟。然后通过抛光完成表面。然后在其两端放置电极，对镍层施加10V和12A的电力。表面温度由热电偶测量。上电1.5秒可达到65ºC的温升，下电5秒可达到50ºC的降温。在注射成型与模型冲压，热启动时间（t_0）和热保持时间（DELTAt）被改变。定义“t_0=0”为开始注射时间。冲压件表面有许多细小的划痕。在注塑成型时无需加热。抄写不清楚。这意味着转录是不完整的。当施加适当的加热（t_0=-ls, DELTAt=2s）时，划痕被清晰地转录。在长时间加热（t_0=0s, DELTAt=3s）的情况下，由于温度高而产生空隙。