Maya Ellison
Printing on plastic plates can be a great way to add a personal touch to your next event or corporate function. Whether you're looking to showcase your logo, a custom message, or a vivid photograph, custom-printed plastic plates can be both elegant and practical. When it comes to the printing process, there are a few popular methods to choose from, including silk screen, pad printing, and laser etching. Pad printing, for example, involves mixing a solvent-based pad printing ink with a solvent, hardener, and other additives, and is a popular choice for printing on plastic. Other methods include using a Continuous Inkjet (CIJ) Printer, which is ideal for high-speed production lines, or UV printers, which use ultraviolet light to cure and bond special UV inks to the surface of the plate.
| Characteristics | Values |
|---|---|
| Printing Methods | Continuous Inkjet (CIJ) Printers, Laser Systems, UV Printers, Pad Printing, Screen Printing, Laser Etching |
| Plastic Materials | Polystyrene, Polypropylene, Polyester, Polyvinyl Chloride (PVC), PET, HDPE |
| Plastic Product Considerations | Ink Adhesion, Pre-treatment, Curing, Post-cure, Adhesion Testing |
| Printing Design | Simple One-Color, Vivid Photographs, Full-Color Imprint, Custom Logos, Text |
| Printing Applications | Product Packaging, Expiration Dates, Barcodes, Event Supplies, Corporate Functions |
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What You'll Learn
Choosing the right equipment
Flexographic Printing
Flexographic printing uses a flexible rubber plate to transfer ink onto the plastic. It offers a good balance of speed and quality, making it suitable for medium-size production runs. Flexographic printing plates can be easily changed, providing flexibility for businesses that need to frequently update their designs or packaging.
Thermal Transfer Printing
Thermal transfer printers use heat to transfer ink onto plastic surfaces. They are suitable for small-scale production runs and offer good print quality. Thermal transfer printing may be more affordable than some other methods, but it may not be as fast or efficient for larger quantities.
Laser Printing
Laser printers can be very fast and can produce high-resolution, high-quality prints. They are ideal for intricate designs as they allow for precise etching onto the plastic surface. However, laser printers can be quite expensive to purchase and maintain. Standard office laser printers may also have limitations in terms of print quality and the types of materials they can print on.
Digital Printing
Digital printing utilizes inkjet technology to produce high-quality images directly onto plastic surfaces. This method offers flexibility, reduced turnaround times, and cost-effectiveness, especially for short or custom print runs. Digital designs can be created using software like Adobe Photoshop or Illustrator and sent directly to the printer. The ink used in digital printing is specially designed for adherence to non-porous plastic, ensuring lasting quality.
Screen Printing
Screen printing is often used for larger designs and high-quality printing applications such as packaging, labels, and product graphics. It uses ultraviolet light to cure inks and coatings, resulting in higher print quality, greater durability, and faster production times compared to some traditional printing methods. Screen printing is also more eco-friendly as it does not require solvents or other hazardous materials.
Pad Printing
Pad printing machines are versatile and can print on a wide range of substrates, including plastic. They offer quick print cycles and can produce a high volume of prints per hour. However, pad printing machines may have limitations in terms of colour options and image size capabilities. Additionally, they require consumable items such as ink, solvents, hardeners, and primers, so it is important to choose the right ink series for the specific substrate being printed on.
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Preparing the plastic
Once the type of plastic is determined, consider whether pre-treatment is necessary. Some plastics, such as solvent-sensitive products, typically do not require pre-treatment. However, non-solvent-sensitive plastics like PP, Nylon, HDPE, and other very hard plastics may need pre-treatment to ensure proper ink adhesion. Pre-treatment methods can vary, including chemical, flame, or corona treatments. Chemical pre-treatments, for example, can involve wiping the plastic surface with a specific solution to prepare it for printing.
After pre-treatment, the choice of printing equipment becomes crucial. Three popular options for printing on plastic include Continuous Inkjet (CIJ) Printers, Laser Systems, and UV Printers. CIJ printers are versatile, reliable, and efficient, making them ideal for high-speed production lines and various materials. Laser systems, on the other hand, use a focused beam of light to remove a material layer, revealing the desired design. They are perfect for creating high-resolution and durable prints. UV printers utilise ultraviolet (UV) light to cure and bond special UV inks to the plastic surface, resulting in high-quality, scratch-resistant prints.
Finally, curing the printed plastic is essential to solidifying the ink and ensuring its durability. Higher curing temperatures can generally improve printing results, but they may also lead to shrinkage and deformation, depending on the plastic material. UV curing is a popular method, exposing the printed item to specific wavelengths of UV light to cure the ink quickly. This process is especially useful for certain ink formulations and printing applications.
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Understanding regulations
Printing on plastic containers is a challenging but rewarding process. It is important to understand the relevant regulations and industry standards to ensure compliance and avoid fines or penalties. Here are some key considerations for understanding the regulations related to printing on plastic plates:
- Federal Regulations and Industry Standards: Adhering to federal regulations and industry standards is crucial when printing on plastic containers. These regulations vary depending on the region, such as the US, Canada, or Europe, and non-compliance may result in penalties or recalls.
- Compliance Codes: Manufacturers of certain products, such as personal care items or electrical components, are often required to print compliance codes on their packaging. These codes include essential information such as expiration dates, lot codes/batch numbers, and other product details. They serve purposes like tracking, consumer safety, and meeting retail requirements.
- Type of Plastic: Different types of plastics, such as polystyrene, polypropylene, polyester, and polyvinyl chloride (PVC), may react differently to various printing technologies and inks. It is essential to select the appropriate printing method for the specific type of plastic material used to ensure clear and durable printing results.
- Container Shape: The shape of the plastic container can impact the ease of printing and the final appearance of the codes. Be mindful of any potential challenges posed by the container's design and ensure that the printing process is adaptable to the container's shape.
- Workplace Conditions: Environmental factors such as temperature, humidity, and dust can influence the printing process. It is important to maintain optimal workplace conditions to ensure consistent and high-quality printing on plastic containers.
- Food Safety Regulations: If the printed plastic plates are intended for food use, it is crucial to comply with food safety regulations. In Europe, Regulation No. 10/2011 summarizes safe and unsafe materials, while in the USA, the FDA CFR 21 document covers these regulations. Additionally, coating the surface of the plates may be necessary to ensure they are safe for direct food contact.
- Eco-Friendly Practices: Consider the environmental impact of your printing processes. Recycle used printing plates according to environmental regulations and explore eco-friendly alternatives, such as Computer-to-Plate (CTP) systems, which offer improved precision, efficiency, and eco-friendliness.
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Using pad printing
Pad printing is a popular method for printing on plastic containers and plates. It is a process of transferring a 2-D image onto a 3-dimensional object. Pad printing machines use three main components to deliver a print: the plate, the ink cup, and the pad.
The plate is etched with the desired image. The ink cup then slides over the plate, leaving a small amount of ink in the etched area. The pad, made of soft silicone, is then pressed onto the plate to pick up the image and is then moved over to the substrate (in this case, the plastic plate) where it is pressed again to transfer the image. The silicone pads come in various shapes and sizes, depending on the application and artwork.
There are different types of inks and additives available for pad printing. The choice of ink depends on the material being printed on. For printing on plastic, it is important to consider factors like ink adhesion and the type of plastic material used. Adding a hardener to the ink can increase durability and scratch resistance.
Pad printing plates are available in plastic, laser, thin steel, and thick steel formats. Plastic plates are more cost-effective but have a shorter lifespan than steel plates. They are typically etched with an alcohol or water wash, and some are compatible with CO2 laser engraving. Steel plates, on the other hand, offer unmatched performance and precision, with thin steel plates providing up to 150,000 impressions and thick steel plates offering up to 1 million impressions.
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UV printing
Before UV printing on plastic, a pre-treatment process is typically required to ensure optimal ink adhesion. The level of pre-treatment depends on the intended use and lifespan of the product. For example, promotional products may require less adhesion than items intended for long-term use, such as drinkware. Proper pre-treatment may include using a primer wipe, flame, corona, or plasma treatment.
UV litho printing is a specific type of UV printing that creates vibrant colours and sharp images. It is commonly used for large print runs, such as packaging, catalogues, brochures, and marketing collateral. This method tends to be more cost-effective than digital printing when printing in larger quantities, as it offers faster and more efficient production of high-quality, repeated items.
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Frequently asked questions
The top three methods for printing on plastic are silk screen, pad printing, and laser etching. Other methods include Continuous Inkjet (CIJ) printing, Laser Systems, and UV printing.
Pad printing is a popular process of printing on plastic, where solvent-based pad printing ink is mixed with a solvent, hardener, and other additives. The ink is added to an ink cup and placed on the pad printing machine, which acts as a stamp to transfer the artwork onto the product.
UV printing uses ultraviolet (UV) light to cure and bond special UV inks to the surface of the plastic. This ensures the ink adheres to the plate, resulting in a high-quality, durable, and scratch-resistant print.
When printing on plastic plates, it is important to consider the type of plastic used, as different plastics have unique characteristics that affect the printing process. For example, some plastics may require pre-treatment to ensure proper ink adhesion. Additionally, factors such as ink adhesion, curing temperature, and regulations or codes must also be considered.
