Ethan Clarke
Printing on plastic is a common practice that has become an essential part of product packaging for many industries, allowing brands to communicate important information and create visually appealing designs. There are various methods to print on plastic, including Continuous Inkjet (CIJ) printers, laser systems, UV printers, screen printing, and pad printing. Each method has its advantages and considerations, and the choice of equipment depends on factors such as the type of plastic, desired quality, efficiency, and cost. Proper preparation of the plastic surface and consideration of regulations and codes are crucial for a successful printing outcome.
| Characteristics | Values |
|---|---|
| Printing methods | Continuous Inkjet (CIJ) Printers, Laser Systems, UV Printers, Pad Printing, Screen Printing, Gravure Printing, Flexographic Printing, Anti-Counterfeiting Printing, Jet Printing, Transfer Printing, Dry Offset Printing |
| Printing considerations | Ink adhesion, type of plastic material, regulations and codes, printing expiration dates, barcodes, pre-treatment of plastic |
| Common plastic materials | Polystyrene, Polypropylene, Polyester, Polyvinyl Chloride (PVC), Polyvinyl Chloride Plastic, ABS Resin Plastic |
| Plastic properties | Simple dyeability, weak solarized colorfastness |
| Printing plate | Cliché |
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What You'll Learn
Choosing the right plastic: thermoplastics or resins
When it comes to choosing the right plastic for printing, you have two main options: thermoplastics or resins. Both have unique properties and applications, and understanding these will help you select the most suitable material for your project.
Thermoplastics are synthetic polymers that can be softened and hardened repeatedly through thermal cycling. This means that when heated above a certain temperature, they become soft and pliable, and when cooled, they solidify. This property makes thermoplastics ideal for 3D printing, where they are commonly used in extrusion and sintering processes. Thermoplastics can be melted, reshaped according to a 3D model, and cooled to create objects with permanent shapes. Some commonly used thermoplastics for 3D printing include ABS, PLA, PETG, and Nylon. Nylon, for instance, is excellent for rapid prototyping, functional testing, and end-use production, while 3D-printed polypropylene is lightweight, flexible, and durable, making it suitable for medical and automotive industries.
Thermoplastic resins offer a unique combination of ease of use and durability. They are often used in insert moulding and can be reformed after use, making them cost-effective. Additionally, thermoplastic resins are lightweight yet tough and durable, making them suitable for various industries such as automotive parts, electronics, industrial machinery, and even jewellery.
On the other hand, resins, or more specifically, thermoset resins, are created through a process called cross-linking, where chemical reactions form long chains of polymers. Once solidified, thermoset resins cannot be melted and reshaped by heating; instead, they will decompose when subjected to high temperatures. In 3D printing, thermoset resins, particularly photopolymer resins, are cured using photopolymerization processes with UV light. Common thermoset resins used in 3D printing include ceramic resin, standard resin, castable resin, and clear resin. Resins are excellent for achieving quality surface finishes, and stereolithography (SLA) is a popular choice for cosmetic parts due to its ability to produce smooth surfaces and fine feature details.
When deciding between thermoplastics and resins, it's essential to consider the specific requirements of your project. Factors such as the desired level of durability, flexibility, surface finish, and the intended application will influence your choice. Additionally, the printing technology you plan to use, whether it's traditional printing methods or 3D printing, may also impact your decision. By carefully evaluating these factors, you can choose the right plastic material that aligns with your project goals and ensures optimal results.
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Printer compatibility: Inkjet or laser
When it comes to printing on plastic, there are various methods and technologies available, each with its advantages and considerations. The choice of printing equipment depends on the specific requirements and the type of plastic used. Some common plastic materials include polystyrene, polypropylene, polyester, and polyvinyl chloride (PVC). Each material has unique characteristics that can influence the printing process and final outcome.
For instance, Continuous Inkjet (CIJ) Printers are versatile, reliable, and efficient, making them ideal for high-speed production lines. They can print on a range of materials, including PVC, PET, and HDPE, by creating a continuous stream of electrically charged ink droplets, ensuring accurate and precise printing on irregular surfaces.
On the other hand, laser systems offer a distinct approach by using a focused beam of light to ablate or remove a material layer, revealing the desired design. Different types of lasers, such as CO2 and fiber lasers, are suitable for different materials. Laser systems are known for producing high-resolution and durable prints on plastic containers. Additionally, they are a good choice for creating high-quality images, graphics, or text, offering excellent colour reproduction and print clarity.
Inkjet printers and laser printers are two of the most commonly used printing technologies, each with distinct characteristics. Inkjet printers, such as CIJ printers, use ink cartridges to propel droplets of ink onto the printing surface, making them versatile and capable of printing on various materials. They are generally more affordable and are suitable for printing on irregular surfaces.
Laser printers, on the other hand, use a laser beam to precisely apply toner to a light-sensitive drum, which is then transferred to the printing surface. Laser printers are known for their high printing speed, sharp text quality, and ability to produce high-resolution images. They are often more expensive upfront but offer lower long-term costs due to their efficient toner usage.
When deciding between inkjet and laser printing for printing on Clic plastic, it is essential to consider the specific requirements and characteristics of the plastic material. Factors such as ink adhesion, desired print quality, durability, and cost should be taken into account. By understanding the properties of the plastic and the advantages of each printing technology, you can make an informed decision to achieve the desired outcome.
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Print settings: high quality, bold lines and dark fonts
Printing on plastic requires different methods and considerations compared to printing on paper. To achieve bold lines and dark fonts on Clic plastic, several factors need to be considered, including the type of printer, ink, and print settings.
When it comes to printers, Continuous Inkjet (CIJ) printers are a popular choice for printing on plastic due to their versatility, reliability, and efficiency. They are suitable for high-speed production and can print on various plastic materials. Laser systems, on the other hand, use a focused beam of light to remove a material layer, revealing the desired design. Different types of lasers, such as CO2 and fiber lasers, are more appropriate for specific materials. UV printers are another option, offering excellent colour reproduction and print clarity. They use ultraviolet light to cure and bond special UV inks to the plastic surface, resulting in high-quality, durable, and scratch-resistant prints.
For ink, it is essential to use the correct type of ink that is compatible with the chosen printer. In the case of CIJ printers, they use a continuous stream of electrically charged ink droplets, allowing for precise printing on irregular surfaces. Laser systems do not use ink but instead rely on the laser to remove material layers. UV printers require special UV inks that cure and bond with the plastic surface.
Now, let's discuss the print settings for achieving high-quality, bold lines, and dark fonts. Firstly, ensure that the print quality setting is set to a higher resolution, such as 300 dpi (dots per inch), which will produce sharper and more defined prints. Adjust the ink intensity or density settings to increase the amount of ink deposited on the plastic, making the lines bolder and the fonts darker. Additionally, play around with the font styles and sizes. Choose a bold or black font face, and consider increasing the font size to make the text stand out more. You can also try using a different font, such as a slab serif or sans serif typeface, that has thicker strokes and higher readability.
Finally, it is important to consider the type of plastic material used. Common plastic materials include polystyrene, polypropylene, polyester, and polyvinyl chloride (PVC). Each material has unique characteristics that can affect the printing process and final results. Some plastics may require pre-treatment to ensure proper ink adhesion. By choosing the right combination of printer, ink, and print settings, you can achieve high-quality, bold, and dark prints on Clic plastic.
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Sheet feeding: one at a time, free of dust and fingerprints
When printing on plastic sheets, it is important to feed the sheets into the printer one at a time to prevent jams and misfeeds. This is especially important when printing on transparency film, as the sheets are more delicate and prone to jamming.
To ensure the best print quality, it is crucial to handle the plastic sheets with care to keep them free of dust and fingerprints. Before feeding the sheets into the printer, check for any dust or debris and gently remove any fingerprints or smudges. Use a soft, lint-free cloth to wipe down the sheets if needed.
It is also important to ensure that the printable side of the plastic sheet is facing down in the printer's feed tray. The printable side is usually slightly rougher, providing better ink adhesion. Refer to your printer's instructions to confirm the correct orientation for feeding sheets.
By taking the time to prepare the plastic sheets properly and feeding them into the printer one at a time, you can achieve high-quality, clear prints while minimizing the risk of jams or smudges. This process may take a bit more time, but it is worth it to ensure optimal printing results on plastic sheets.
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Drying: allow time to dry to avoid smudges
When printing on Clic Plastic, it is important to allow sufficient time for the ink to dry to prevent smudges and ensure the best quality results. The drying time can vary depending on several factors, including the type of ink, the amount of ink used, and the material printed on.
For standard documents printed on regular paper, they can usually be handled immediately after printing without any issues. However, for prints on specialty materials like Clic Plastic, it is recommended to leave them untouched for a more extended period to dry thoroughly. While some sources suggest that photo inkjet prints can be handled as soon as they come out of the printer, they are not fully cured and dried at this stage. It takes about 24 hours for an inkjet print to fully cure and dry.
To speed up the drying process, you can use a blow dryer on a low setting after waiting for an hour or two for the initial drying phase. However, it is important to note that some inks and materials may have specific requirements, so always refer to the manufacturer's instructions.
If you plan to frame or seal your print, it is crucial to allow ample drying time. Manufacturers typically recommend a minimum of 24 hours before framing to prevent smudging and the "fog" effect on glass or plastic. This is due to the curing process, which involves the evaporation of solvents in the ink.
In general, it is good to allow at least an hour before deciding if you are satisfied with a print. For stacking or storing prints, consider placing a sheet of plain paper between them, especially if they have not fully dried, to prevent smudging. Remember that drying times can vary, so it is always best to err on the side of caution.
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