Plastic seals and security seals are extensively utilized in securing cash bags, cash boxes, ATM cash boxes, and similar items. These seals are attached to indicate that the item is securely closed or sealed. Known as electric meter seals, power seals, or oil seals, they play a crucial role in preventing theft and leakage within the electric power, petroleum, and instrument industries.
 
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 Typically, plastic seals are customized with the customer's name, such as "X Power" or "X Water Supply," and may also include a logo. Each seal is uniquely marked with a serial number or code, enhancing its authenticity and providing an additional layer of security against tampering or forgery.
The words printed on the plastic seal are created using laser printing or hot stamp technology, resulting in a clear and attractive appearance. However, many plastic laser markings often feature dim logos. This occurs because the materials in the plastic do not effectively absorb laser energy. Fortunately, this issue can be addressed by incorporating specialized additives known as Laser Marking Additives.
Solution: Verify if the heating temperature is too low or if there is a drop in molding pressure.
Laser engraving is a state-of-the-art marking technology that enables the creation of durable prints from even the thinnest lines and intricate logos or symbols. This process allows for the engraving of numbers and barcodes, typically in monochrome. The color of the print is predetermined: light colors are engraved directly onto the material, while darker colors require an additional white background to enhance contrast and readability.
Laser marking is particularly effective for applications that require complex markings, barcodes, and increased mechanical resistance. To achieve optimal results when marking plastic seals, a special pigment powder is added during the molding process. This powder improves the contrast of the marking without compromising the material's properties. During the engraving process, the laser beam interacts with the material, generating heat to create the desired markings.
Key points for process control: When setting the molding pressure, it’s crucial to consider both the molding temperature and the specific type or coating of the holographic materials, along with the softening point of the material layer during molding. Excessively high pressure can damage the mold plate or cause the holographic material to break, while insufficient pressure can result in unclear or incomplete molded images.
