Process for welding of thermoplastic resins
A thermoplastic resin and casting technology, used in welding equipment, laser welding equipment, manufacturing tools, etc., can solve the problem of undocumented control methods, and achieve the effect of excellent surface characteristics and high-strength welding areas
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Embodiment 1
[0133] The films of the above-mentioned first embodiment, ie, the partially crosslinked thermoplastic elastomer olefin-based film 3 and the polypropylene film 4 were used. Overlay the membrane on the elastomeric membrane on the infrared irradiated side and move to image 3 in the device shown. Simultaneously with the initiation of infrared irradiation, the support was moved over about 25 mm at a moving speed of 2 mm / sec in a direction perpendicular to the irradiation to obtain a weld. The output of the laser was about 7W during the welding process, and the welded film was continuously taken out after welding. The width of the welding area corresponding to the diameter of the irradiation beam was about 0.8 mm.
[0134] For the evaluation of the surface characteristics of the welded area, the surface of the welded and unwelded area was observed using a digital microscope, and the results were as follows: Figure 5 shown. The surface unevenness measured by the roughness teste...
Embodiment 2
[0140] The second membrane combination described above with tetrafluoroethylene-perfluoroalkoxy copolymer (PFA) was used. The welding conditions were the same as in Example 1 except that an output of 6W was used. After welding, the membrane is continuously removed from the device. The width of the welding area corresponding to the diameter of the infrared beam is about 1.4 mm.
[0141] Visual inspection confirmed that no melting and shrinkage occurred on the film surface, the transparent state of the inner region, and the surface properties were substantially unchanged. It is almost impossible to distinguish welded and unwelded areas. like Figure 9 and 12 As shown, the surface smoothness of the welded area is almost the same as that of the unwelded area. It can be considered that melting and condensation occur only in the inner region. The weld strength was 24N / 15mm, and no separation was observed in the tensile test. It was demonstrated that sufficient weld strength w...
Embodiment 3
[0146] A third film combination, a liquid crystal polymer (LCP) film, was used. The welding conditions were the same as in Example 1 except that the laser output was 12W. The film was continuously removed from the device after welding with a width corresponding to the diameter of the laser beam of about 0.8 mm. Visual inspection confirmed the complete absence of surface melting and shrinkage. The change in surface properties is so small that it is difficult to distinguish welded from unwelded areas. like Figure 15 and 18 As shown, it can be considered that melting and condensation by infrared irradiation occur only in the inner region. The weld strength was 3N / 15mm, and the performed weld maintained good surface properties.
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Abstract
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