Omar Khalid
Printing on plastic can be done in a variety of ways, including pad printing, screen printing, flat-bed printing (inkjet), thermal transfer printing, and dry offset printing. The specific method chosen depends on factors such as the type of plastic, the desired quality, and cost considerations. While some methods like pad printing require specialized equipment and inks, others like inkjet printing can be done with consumer-grade printers and the right type of ink. Pre-treatment of the plastic surface may also be necessary to ensure proper ink adhesion, depending on the specific plastic material and printing process.
| Characteristics | Values |
|---|---|
| Printing Methods | Continuous Inkjet (CIJ) Printing, Laser Systems, UV Printing, Inkjet Printing, Pad Printing, Screen Printing, Laser Etching, Digital Inkjet Printing, Flexo Printing, Laser Printing, Handheld Thermal Inkjet Printing |
| Printing Considerations | Ink adhesion, type of plastic material, regulations and codes, printing expiration dates, barcodes, and other essential product information |
| Pre-Printing Steps | Cleaning the surface, avoiding scratches and streaks, handling the plastic containers with care |
| Post-Printing Steps | Curing the ink, either by heat or air |
| Printing Applications | Industrial labeling, creative projects, custom packaging, promotional products, gift cards, ID cards, loyalty cards, beverage bottles, food packaging, medical equipment, PVC bottles, plastic toys |
| Printing Advantages | Quick turnaround times, lower costs, customizability, durability, high resolution, portability, ease of use, versatility, precision |
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Pad printing
To set up a pad printing machine, you will need a printing plate (also known as a cliche), ink, and a machine. The printing plate is etched with the desired pattern, typically using metals like steel or copper, and can be created through two processes: photopolymer and laser. The etching holds the ink, while a smooth silicon pad collects the ink from the plate and transfers it to the designated object. The silicon pads are available in many shapes and sizes, with round and rectangular being the most common. The ink cup, usually made of ceramic, metal, or plastic, applies ink to the etching and slides across the print plate to deposit ink.
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Inkjet printing
There are a few different types of inkjet printers that can be used for printing on plastic. One option is a flat-bed inkjet printer, which is often marketed as being able to print full-colour on iPhone covers, with a scratch- and water-resistant finish. These printers typically retail for $1000 and up for A4 size. There are also variations within this category, such as UV-curing and non-UV curing. For example, some lower-end machines use Epson print heads, which may indicate that a regular consumer inkjet printer could be used to print on thin plastic with the right ink.
Solvent-based inks, for example, can be used with inkjet printers to print on plastic. These inks will stick to plastics and provide a waterproof and almost scratch-proof print. However, these inks are typically used with large-format inkjets, not regular inkjet printers, which use water-based inks that will smudge on plastic.
Another option for printing on plastic with an inkjet printer is to use a laser-suitable water-soluble paper. You can print your image on this paper with an inkjet printer, and then transfer it to the plastic using an iron. This method may be preferable for printing on curved plastic surfaces, as it does not require the same level of precision as direct printing.
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Thermal transfer printing
There are two primary types of thermal transfer printing: flat head and near edge. In flat head printing, the print head sits directly on the ribbon and surface, suitable for a wide range of materials. Near edge printing involves angling the print head slightly, allowing for higher print speeds and precision, making it ideal for fast packaging lines.
To achieve optimal print performance in thermal transfer printing, it is crucial to match the ribbon to the substrate. Manufacturers often provide compatibility charts to guide the selection of the appropriate ribbon for a specific substrate. Additionally, the print head temperature should be adjusted to ensure proper ink melting and transfer.
Compared to other printing methods, such as inkjet printing, thermal transfer printing offers advantages in terms of durability, low maintenance costs, and environmental friendliness. It does not require the cleaning of ink tanks and nozzles after each color change, and it releases fewer environmentally hazardous substances during the drying process.
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Screen printing
The process can be broken down into several key steps:
Creating the Screen Frame
A frame is needed, typically made of wood or metal. A screen mesh, usually a fine nylon or polyester mesh, is stretched tightly over this frame.
Applying the Photo Emulsion
A layer of photosensitive emulsion is evenly applied to the screen. Once exposed to light, this emulsion hardens, while the unexposed areas remain soft and can be washed away with water.
Exposure
The prepared design pattern (usually a black design on a transparent film) is placed over the screen coated with the photo emulsion, and then it’s exposed to light.
Ink Selection
Pick the right kind of ink based on the material being printed on. There are different inks for printing on plastics, metals, and other materials. Ensure the ink and the material are compatible.
Durability and Resistance
Consider how durable your printed design needs to be, especially if it will be exposed to rough environments or wear and tear. Choose inks and printing methods that can withstand these conditions.
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Laser printing
There are several types of laser systems available for printing on plastic, including CO2 lasers, fiber lasers, and UV lasers. Each type of laser system has its advantages and is more suitable for specific materials. For instance, CO2 lasers are commonly used for marking codes, text, and logos on plastic and rubber parts, while fiber lasers are ideal for high-contrast coding. UV lasers are also used for high-contrast, permanent coding and are suitable for high-speed applications.
Before laser printing on plastic, it is essential to properly prepare the plastic surface. This includes thoroughly cleaning the surface to remove any dust or residue, especially for curved surfaces like plastic bottles. It is recommended to use a soft cloth and a gentle cleaning solution to prevent scratches. Additionally, handling the plastic with care is crucial to avoid damaging the printing surface.
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Frequently asked questions
Yes, it is possible to print on plastic bags. However, it is not recommended to buy a printer to do it yourself as it is expensive and time-consuming.
Printing on plastic bags is mostly done with tampon printing. Other methods include screen printing, flatwork printing, and heat transfer printing.
It is recommended to use UV drying ink or air-dry inks for printing on plastic bags.
It is not advisable to print on plastic bags at home due to the specialised equipment and inks required. It is recommended to contact a local screen printer or a company that specialises in printing on plastic bags.
There are minimum order requirements when printing on plastic bags, typically around 5000 bags. Additionally, there may be safety concerns when printing on plastic bags intended for food packaging due to the use of solvent-based inks.
