Thermoplastics are a class of plastics that are malleable at a certain temperature, solidify after cooling, and repeat the process. They are usually made up of linear polymer compounds that do not cross-link when exposed to heat. Thermoplastics can be reprocessed and reprocessed to make new products. According to its performance characteristics, wide range of uses and versatility of molding technology, thermoplastics can be divided into general plastics, engineering plastics and special plastics.
Thermoplastics are widely used, including polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate, polyamide, acrylic plastics, other polyolefins and their copolymers, polysulfone, polyphenylene ether, etc. They are commonly used to produce parts through various polymer processing technologies, such as injection molding, compression molding, calendering, and extrusion.
Thermoplastic laser transmission welding is a precision welding technique that is mainly used to weld thermoplastic parts together. Its advantages include high speed, no vibration, good watertightness and airtightness, cleanliness, efficiency and stability. This welding technique produces high-precision weldments that weld firmly, and can be applied to workpieces of various shapes and sizes, even those with small sizes or complex structures.
Laser transmission welding has certain requirements for the properties of the two materials to be welded. The upper thermoplastic layer should be transparent to the laser wavelength used, while the lower thermoplastic layer absorbs the laser energy. The laser beam passes through the transparent upper material to the lower material, and the surface of the lower material melts due to the absorption of laser energy, at which point the two materials are welded together by molecular connection under a certain pressure.
Depending on the welding task and requirements, the process of laser welding is also different. Contour welding is the simplest and most widely used welding process. During welding, the laser beam moves on the welded object through the optical system and galvanometer or the laser beam is stationary and the welded object moves. The interaction time between the laser and the object to be welded depends on the beam focus size and the speed of movement, which affects the welding time and effect.
Since the laser is focused on the surface of the underlying material in non-mechanical contact, the thermal effects caused by the laser are localized, so this method avoids mechanical and thermal damage to the material being welded. At the same time, laser welding has the advantage of no residue, making it more suitable for pharmaceutical products and electronic sensors controlled by the State Food and Drug Administration.
For this kind of plastic materials, this transmittance detector is specially designed to detect the near-infrared transmittance characteristics of plastic materials, and the light transmittance of injection molded parts is scanned in full screen. The detection area and transmittance range can be freely defined according to the need, and the transmittance and impurities of the detection area can be automatically extracted, and the position of impurities can be automatically marked. This product is suitable for multi-point testing of samples, avoiding missed tests, easy test operation, no need for positioning fixtures, extremely fast test speed, and complete the measurement within one second.