Laser plastic welding method and plastic product

Abstract

The invention discloses a laser plastic welding method and a plastic product. The method comprises the following steps that at least two pieces of plastic are butt-jointed or stacked together, and a heat-conduction cover plate is arranged on the top surfaces of the plastic in a pressing manner; a mid-infrared thulium-doped optical fiber laser with the wavelength being 1,940 nm and a galvanometer are arranged above the heat-conduction cover plate; the optical fiber laser is started and emits a laser beam, the laser beam is transmitted onto the galvanometer and moves along the heat-conduction cover plate according to the preset scanning path after passing through the galvanometer, the plastic absorbs the energy of the laser beam passing through the heat-conduction cover plate, and thus welding is completed; and the plastic product is produced with the laser plastic welding method. With the laser plastic welding method, efficient welding can be realized, additive pollution can be reduced,the welding cost can be reduced, the performance of the welded product is stable, and the surface layers of the plastic can be prevented from being burnt.

Description

Technical field [0001] The invention relates to the technical field of laser welding, in particular to a method for laser welding plastics and plastic products. Background technique [0002] Laser plastic welding is a new type of plastic processing method. Laser plastic welding has the characteristics of clean and efficient, and it is increasingly used. [0003] Biological ear tags are animal identifications applied to biological ears to identify biological identities. They are often used to identify and track livestock, help control animal diseases and improve the management level of farms. Biological ear tags are commonly used in TPU plastic shells with built-in chips. The transparent TPU material is soft, so welding methods such as ultrasonic cannot be used, and adhesive methods are mostly used. Lasers with wavelengths of 915nm-980nm cannot be absorbed by transparent TPU materials. They are mostly used for welding products where the upper layer is transparent and the lower lay...

AI Technical Summary

Problems solved by technology

However, the transparent TPU material is soft and cannot be welded by ultrasonic waves, and glue is often used.

Lasers with a wavelength of 915nm-980nm cannot be absorbed by transparent TPU materials, and are mostly used for welding products with light-transmitting upper layers and light-absorbing lower layers. In order to achieve welding, absorbents need to be added, which increases the cost of plastic welding. Instability factors, on the other hand, the absorption of the absorbent components sprayed by organisms may also have adverse effects on organisms

[0004] Some plastics need to be butt welded. During the plastic butt welding process, transparent plastics have a low absorption rate for infrared wavelengths of 915nm-980nm, and cannot efficiently absorb laser energy at the butt joints, resulting in low welding efficiency and may require repeated welding.

In addition, the laser directly acts on the surface of the plastic during welding, and the laser energy absorbed by the surface is the largest, which often causes burns on the surface of the plastic.

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