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Thermal printing is a digital printing process that uses heat to create images or text on paper. Unlike traditional printers, thermal printers do not rely on ink or toner, making them a more cost-effective and low-maintenance option.
There are two main types of thermal printers:
Direct Thermal Printers
How They Work: Direct thermal printers use chemically treated paper that changes color when exposed to heat. A print head applies heat directly to the paper, creating the desired text or images.
Applications: Commonly used for receipts, shipping labels, and short-term labels (e.g., tickets).
Pros: Simple design, no need for ink or ribbons.
Cons: Labels are prone to fading over time and sensitive to heat or sunlight.
Thermal Transfer Printers
How They Work: Thermal transfer printers use a ribbon coated with wax, resin, or a combination of both. Heat from the print head melts the ribbon material, transferring it onto the label surface.
Applications: Used for durable labels, such as barcodes, asset tags, and product labels.
Pros: Long-lasting and highly resistant to environmental factors.
Cons: Requires ribbons, adding to operational costs.
Print Head
The print head is the heart of a thermal printer. It contains tiny heating elements that apply heat to the paper or ribbon. The resolution of the print head (measured in dots per inch or DPI) determines the clarity of the print.
Platen Roller
This roller presses the paper or label against the print head, ensuring even contact and accurate heat transfer.
Control Board
The control board processes the digital input from a computer or other device and translates it into signals that control the print head.
Thermal Paper or Ribbon
Depending on the printer type, either thermal paper or a ribbon is used as the medium for creating the print.