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Investigations on Laser Transmission Welding of Absorber-free Thermoplastics

机译：无吸收剂热塑性塑料的激光透射焊接研究

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Within the plastic industry laser transmission welding ranks among the most important joining techniques and opens up new application areas continuously. So far, a big disadvantage of the process was the fact that the joining partners need different optical properties. Since thermoplastics are transparent for the radiation of conventional beam sources (800-1100 nm) the absorbance of one of the joining partners has to be enhanced by adding an infrared absorber (IR-absorber). Until recently, welding of absorber-free parts has not been possible. New diode lasers provide a broad variety of wavelengths which allows exploiting intrinsic absorption bands of thermoplastics. The use of a proper wavelength in combination with special optics enables laser welding of two optically identical polymer parts without absorbers which can be utilized in a large number of applications primarily in the medical and food industry, where the use of absorbers usually entails costly and time-consuming authorization processes. In this paper some aspects of the process are considered as the influence of the focal position, which is crucial when both joining partners have equal optical properties. After a theoretical consideration, an evaluation is carried out based on welding trials with polycarbonate (PC). Further aspects such as gap bridging capability and the influence of thickness of the upper joining partner are investigated as well.
机译：在塑料工业中，激光传输焊接是最重要的连接技术之一，并不断开拓新的应用领域。迄今为止，该方法的一个很大的缺点是连接伙伴需要不同的光学特性。由于热塑性塑料对于常规光束源（800-1100 nm）的辐射是透明的，因此必须通过添加红外吸收剂（IR-absorber）来提高连接伙伴之一的吸收率。直到最近，没有吸收剂的零件的焊接才成为可能。新型二极管激光器提供了多种波长，可以利用热塑性塑料的固有吸收带。通过将适当的波长与特殊的光学器件结合使用，可以在不使用吸收剂的情况下对两个光学上相同的聚合物部件进行激光焊接，这可用于医疗和食品行业的大量应用，在这些应用中，吸收剂的使用通常会导致成本和时间的增加消耗授权过程。在本文中，该过程的某些方面被视为焦点位置的影响，这在两个连接伙伴都具有相同的光学特性时至关重要。经过理论上的考虑，基于聚碳酸酯（PC）的焊接试验进行了评估。还研究了其他方面，例如间隙桥接能力和上连接伙伴厚度的影响。

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