Radiative heat transfer in plastic welding process
Radiative heat transfer in plastic welding process
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DOI：
10.1016/j.jqsrt.2004.07.034
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发表时间：
2005-06
影响因子：
2.3
通讯作者：
Y. Kurosaki
中科院分区：
文献类型：
--
作者：
Y. Kurosaki
本讲座简要回顾了塑料焊接工艺的最新发展。本文的具体重点是一种新的CO2激光焊接工艺的角度来看，涉及同时辐射和传导现象的传热。讨论了以CO2激光器为辐射源的焊接实验和同时考虑焊接过程中辐射与传导复合传热的数值模拟的原理和特点。通过将红外辐射吸收加热和热扩散冷却过程相结合的概念应用于塑料薄膜，证实了这一过程的可行性。在辐射加热过程中，对红外辐射透明的具有高热扩散率的固体材料用作与重叠的热塑性塑料的辐射表面接触的散热器。该工艺能够实现高的焊接强度和优异的表面外观，而不会引起常规直接红外辐射焊接工艺中经常遭受的表面热损伤。此外，该方法不需要在焊接材料中着色以增加辐射吸收。
This lecture is a brief review of recent developments in plastic welding processes. The specific focus of the paper is on a novel CO 2 laser welding procedure from the point of view of heat transfer involving simultaneous radiation and conduction phenomena. The principle and features of the process for both the experiments using a CO 2 laser as a radiation source and the numerical simulations considering combined radiation and conduction heat transfer simultaneously in welding process are discussed. The feasibility of this procedure is confirmed by applying the concept to the plastic films with combination of infrared radiation absorbing heating and thermal diffusion cooling processes. A solid material transparent to infrared radiation with a high thermal diffusivity is used as a heat sink in contact with irradiated surface of overlapped thermoplastics during radiation heating. The procedure is able to achieve both high weld strength and excellent surface appearance without causing surface thermal damage as often suffered in conventional direct infrared radiation welding processes. In addition, pigmentation in welding material to increase absorption of radiation is unnecessary for this method.