研究目的
To create a white marking inside transparent plastic materials by heating them to a temperature close to the threshold of creating a void and using a fiber laser.
研究成果
The authors successfully demonstrated the creation of white markings inside transparent plastic materials by heating them and using a fiber laser. This method allows for the creation of durable markings that are difficult to tamper with, making it suitable for applications such as printing identification numbers on plastic bottles.
研究不足
The method requires heating the plastic materials to specific temperatures, which may not be feasible for all applications. Additionally, the process parameters (laser output, scanning speed) need to be carefully controlled to achieve the desired results.
1：Experimental Design and Method Selection:
The experiment involved heating transparent plastic materials (polycarbonate and polyethylene terephthalate) and using a 1.55 μm nanosecond pulse fiber laser to create white markings inside them. The laser was focused to a specific diameter, and the materials were heated to specific temperatures to create voids at the focus position.
2：55 μm nanosecond pulse fiber laser to create white markings inside them. The laser was focused to a specific diameter, and the materials were heated to specific temperatures to create voids at the focus position.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Polycarbonate and polyethylene terephthalate were used as the transparent plastic materials. The samples were 4 mm in thickness.
3：List of Experimental Equipment and Materials:
A 1.55 μm single-mode nanosecond pulse fiber laser, a pulse generator, two erbium doped fiber amplifiers, a bandpass filter, and a lens were used. The plastic materials were polycarbonate and polyethylene terephthalate.
4：55 μm single-mode nanosecond pulse fiber laser, a pulse generator, two erbium doped fiber amplifiers, a bandpass filter, and a lens were used. The plastic materials were polycarbonate and polyethylene terephthalate.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The laser was irradiated inside the samples while heating them to specific temperatures (150 °C for polycarbonate and 50 °C for polyethylene terephthalate). The scanning speed and laser average output were varied to observe the effects.
5：Data Analysis Methods:
The processed parts were observed with a stereomicroscope and a scanning electron microscope to analyze the formation of white markings and voids.
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