The Basics of Thermal Paper: Structure, Advantages, & Applications

Thermal paper

Tommy Lai |

Thermal paper has become a top choice for businesses in retail, dining, and hospitality, where efficient, reliable receipt printing is essential.

Unlike traditional ink printing, which can be slow and messy, thermal paper technology offers a quick, clean solution. With a special heat-sensitive coating, thermal paper rolls use thermal print heads to produce images instantly without ink. 

But what's more to know about this special paper? Today, we'll cover the basics of thermal receipt papers, including the structure, advantages, and key applications. Read on to discover why they could be a smart choice for your business needs.

What's Thermal-Coated Paper?

Thermal paper coated with heat-sensitive chemicals reacts to high temperatures by turning black when exposed to heat insulation. In a thermal printer, the thermal print head heats up and presses against the paper, activating the chemicals to provide the thermal image or text. 

Structure

As mentioned, several chemicals are used to make heat-sensitive papers. Let’s look at each one.

Base

The production begins with a base layer of wood-free sheets made from wood pulp, similar to standard papers. This foundational layer is treated with various compounds to prepare it for printing. 

  • This base layer gives the heat-sensitive sheet its strength and thickness to make it durable and reliable. 
  • High-quality pulp is used to create a smooth and consistent surface, which is essential for clear, lasting prints.

Pre-Coat

A pre-coating layer is added to the base to improve heat insulation for a clear, efficient image or text printing. This pre-coat also enhances the paper’s smoothness and durability, which results in a high-quality, long-lasting final product.

Thermal Coat

The coating process is essential in creating specialized sheets for printing. This layer contains various chemical compounds that respond to warmth to produce clear prints. The primary components include:

Leuco Dyes

  • Colourless crystals ground into a fine powder.
  • Melts upon contact with the hot temp from the print head.
  • Interacts with the developer to create the final colour

Developers

  • Usually organic acids, such as Bisphenol-A (BPA) or Bisphenol-S (BPS).
  • Work with leuco dyes to produce opaque colours

Sensitizers

  • Added to ensure the reaction occurs at the correct temperature.
  • Maintains the optimal conditions needed to trigger the reaction for consistently high-quality printed images and texts.

Top Coat 

Most audit rolls feature a protective top layer that safeguards the coating from environmental elements like light, moisture, oils, and friction. This protective layer helps improve the durability and readability of printed receipts.

Advantages

Heat-sensitive papers have many advantages that make them widely popular in various industries. Here are some key advantages:

Fast Imprinting

Audit roll printers are known for their speed, which makes them ideal for busy environments like retail and restaurants. This quick imprinting reduces wait times and enhances the satisfaction of customers. 

Switching from traditional to heated printing can cut print times to milliseconds and is useful for receipts, packages, and shipping labels to improve overall efficiency.

Minimal Costs

Inkless imprinting eliminates the need for ink, toner, or ribbons, which can reduce operating costs. 

  • Although these printers may have a higher upfront cost, the savings on consumables and maintenance make them cost-effective over time. 
  • They are affordable and readily available, which further enhances cost efficiency for businesses.

Durability

Traditional ink printers can wear out quickly under heavy use, which requires frequent maintenance. In contrast, inkless printers have fewer moving parts, which makes them more reliable for high-volume imprinting. Receipts printed on heat-sensitive papers are durable and protected from fading and damage. This ensures they remain readable for important records and warranties.

High-Quality Print

Print quality is vital for businesses that produce large volumes of materials daily, including:

  • Receipts
  • Labels
  • Tickets

Ink printers can leave smudges, which require time to correct. In contrast, inkless printing consistently delivers sharp, clear, and precise prints without smears to guarantee high readability for important documents.

Versatility

Audit rolls are adaptable and find applications in many environments beyond standard retail. 

  • They are used in ATMs, parking meters, ticket machines, medical equipment, and more.
  • This flexibility positions inkless printers and papers as vital tools for any scenario needing efficient and dependable receipt production.

Major Applications

Food or Point of Sale (POS) Labels

Widely used for food labelling and point-of-sale receipts in restaurants and grocery stores.

  • Its quick imprinting capabilities ensure that customers receive their receipts promptly.
  • The ability to print barcodes and product information on labels makes it ideal for inventory management and checkout processes to ensure accurate and efficient transactions.

Shipping Labels

These labels often include barcodes, tracking numbers, and shipping addresses, which are necessary for the timely and accurate delivery of packages.

  • Printers produce clear and durable slips that can withstand various environmental conditions.
  • Information remains legible throughout the shipping process.

Amusement Tickets & Tags

Commonly used for printing tickets and tags for amusement parks, events, and transportation systems.

  • The fast imprinting speed and ability to generate high-quality images make it suitable for creating tickets that are easy to scan and read.
  • This enhances the customer experience by lessening wait times and improving efficiency at entry points.

Pharmaceutical

In the pharmaceutical industry, imprinting tags for medications and prescriptions are important. These tags often contain vital information, such as:

  • Dosage instructions
  • Expiration dates
  • Barcodes for inventory tracking

The durability and moisture resistance ensure the information remains intact, supporting patient safety and compliance with regulations.

Handy Terminals

Audit rolls are frequently utilized in handheld terminals used for mobile payment systems, inventory tracking, and other applications.

  • These devices require quick and reliable capabilities, and thermal receipt paper meets this demand with its fast output and ease of use.
  • The compact nature of these papers makes them ideal for portable devices, allowing businesses to maintain efficient operations in various settings.

Thermal vs Normal Paper 

Features

Thermal Papers

Normal Papers

Structure

Coated sheet with a heat-sensitive chemical layer

Uncoated sheets made from wood pulp or recycled materials

Cost

Generally more expensive due to specialized coating, but low maintenance

Typically cheaper due to less production process

Image Quality

Produces clear, sharp images

Quality depends on the printer and ink/toner used

Printer Compatibility

Requires a heated printer

Compatible with various types of printers

Printing Method

Uses heat to create images and text

Utilizes ink or toner

Printing Speed

Faster

Slower


Get These Sheet Rolls For Your Business

Product 

Size

Regular Price 

Direct Thermal Labels - 24 Rolls

4 x 6 inches

$259.95

Thermal Paper Rolls - 50 Rolls

3 ⅛”  x 220’ 

$74.95

Thermal Paper Rolls - 100 Rolls

2 ¼” x 50’

$54.95

 

 

Use the Right Sheet for Printing

Thermal paper offers numerous advantages, including high-quality images and durability, making it an ideal choice for businesses across various industries. Its ability to produce clear and reliable receipts and labels enhances customer satisfaction while reducing operational costs.

Audit rolls prove essential in today's competitive environment, with applications ranging from retail and shipping to pharmaceuticals and amusement parks. For your business needs, consider Patek Packaging, where we provide high-quality solutions tailored to your company's requirements. Order now.

 

Frequently Asked Questions

Can you use heat-sensitive papers on a normal printer?

No, it cannot be used in a regular printer. These papers use heat to produce images, whereas standard printers use ink or toner. Using audit rolls in a regular printer can damage the device and create a fire risk, as the hot temperature might cause the sheet to catch fire.

The chemicals can also harm the print heads of regular printers, which aren’t built to handle such materials. To avoid equipment damage and ensure clear, lasting prints, you need to use the right type of sheet for your printer or POS system.

Are audit rolls good for recycling?

Yes, they're recyclable and earth-friendly. Audit rolls are more environmentally friendly than traditional options. Many manufacturers now provide BPA-free and phenol-free papers to minimize health and environmental risks. This also eliminates waste from ink cartridges and ribbons for sustainability.

What is the printing process?

The process is simple yet effective. It starts with the printer heating up in specific patterns that match the desired text and images when a transaction occurs. This activates the chemical coating on the paper, causing leuco dyes to react with developers and change colour—usually black—to form the characters and images. As the printer moves the sheet forward, this heating process continues, resulting in the final printed receipt.