A Study on CO2 Laser Butt Welding of Plastics by Heat Transfer Control Using a Heat Sink

采用散热器传热控制的 CO2 激光塑料对接焊研究

基本信息

批准号：
17560175
负责人：
KUROSAKI Yasuo
金额：
$ 2.18万
依托单位：
The University of Electro-Communications
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

This report introduces a novel concept of CO2 laser welding of thermoplastics which is applicable to manufacturing medical appliances, micro-scale devices and the products requiring the smooth surface of welded region.The procedure has a few features: (1) to place a solid heat sink transparent to a infrared radiation beam in contact with an irradiated plastic to cool the surface during welding process, (2) to use no pigmentation or dye for radiation absorption enhancement, (3) to sustain thermal damage on the surface, and (4) to avoid the emission of harmful gas due to decomposition of plastics. The feasibility of the welding procedure for natural transparent plastics such as polyolefin and perfluoroalkoxy resins without any surface damage was examined using a CO2 laser (expediently diode laser) as a radiation source with a solid heat sink.By the numerical analysis of heat transfer in the objective model, it was confirmed that the cooling by fixed heat sink is effective for temperature reduction on the surface of the plastics, but it relatively takes much heat from there. In this method, it was proven that it could not be well heated deep within the thick articles. Then we tested the "pulse-irradiation": firstly, heat sink was set on the surface of the plastic during a certain irradiation of laser, secondly, heat sink was released and laser irradiate the plastic directly (This way was repeated several times). As the result, to prevent the thermal injury of the surface was the priority problem, the cooling by heat sink is moderately utilized and heat is supplemented with the direct irradiation in the short time for balanced temperature profile. This effect was confirmed by the experiment.

该报告介绍了热塑性二氧化碳激光焊接的新颖概念，适用于制造医用设备，微尺度设备和需要焊接区域光滑表面的产品。该过程具有一些特征：（1）将固体散热器透明地固定在与范围内的范围内的固定辐射透明的过程中（2吸收增强，（3）以维持表面的热损伤，（4）避免由于塑料分解而导致有害气体的排放。使用CO2激光器（权宜的二极管激光器）作为固体散热器，通过固定的散热器来确认固定的散热器，使用固定的散热器，使用固定的散热器，使用固定的散热器，使用固定的散热器，使用固定的温度来确认，焊接的可行性，没有任何表面损害，使用CO2激光（权宜的二极管激光器）作为固体散热器检查了辐射源，以确认固定散热的数值来确认固定的散热器，以确认对固定的散热器的数值分析。从那里有很多热量。在这种方法中，证明它在厚的文章中不能很好地加热。然后，我们测试了“脉冲辐射”：首先，在激光的一定辐射过程中，将散热器设置在塑料表面上，其次，释放散热器被释放，激光直接照射塑料（这种方式重复了几次）。结果，为防止表面的热损伤是优先问题，散热器的冷却是适度利用的，并在短时间内补充了直接照射，以使温度均衡。实验证实了这种效果。