When it comes to screen printing, achieving both ultra-soft prints and vibrant colors on fabric can be a challenging balance. Fortunately, combining discharge inks with plastisol inks offers a unique opportunity to create prints that are not only visually striking but also incredibly soft to the touch. In this article, we will explore how you can successfully combine discharge and plastisol inks to achieve ultra-soft, vibrant prints while preserving the integrity of the fabric.
What Are Discharge and Plastisol Inks?
Discharge Inks
Discharge inks are water-based inks that work by removing (discharging) the dye from the fabric. They are primarily used on dark-colored garments and create vibrant prints with a soft feel. The process involves applying the discharge ink to the fabric, where it chemically reacts with the dye, essentially bleaching out the color and replacing it with the print. Discharge prints are known for their incredibly soft feel since the ink does not sit on top of the fabric but rather interacts with the fibers.
Plastisol Inks
Plastisol inks, on the other hand, are oil-based and sit on top of the fabric, creating a slightly raised print. They are commonly used for bold, vibrant designs, and they retain their color integrity. Plastisol inks are more durable than discharge inks and are typically used for high-opacity prints. They are easy to work with and offer long-lasting results, though they can create a stiffer feel compared to discharge inks.
By combining these two ink types, you can achieve the best of both worlds---soft, breathable prints with the vibrant colors that plastisol inks are known for.
Steps to Combine Discharge and Plastisol Inks
1. Choose the Right Garment and Fabric
When combining discharge and plastisol inks, it's important to start with the right fabric. Discharge inks work best on cotton-based fabrics, especially dark-colored garments like black or navy. Since discharge inks bleach out the fabric's dye, they require the right combination of fabric and dye to produce the best results.
- Cotton Fabrics: Ideal for discharge inks, ensuring the best print quality and softness.
- Polyester Blends: Can be trickier to work with since discharge inks might not work as effectively on synthetic fibers. If you plan to print on these fabrics, it's best to check compatibility before proceeding.
Choose a fabric that will allow the discharge ink to work properly while also accommodating the plastisol ink layer for vibrant, durable prints.
2. Preparing the Discharge Base
The first step in the process is preparing the discharge base. A discharge base is a special type of discharge ink that can be mixed with a discharge activator to remove the fabric's dye. The base can be applied first to create a soft underlayer.
- Mix the Discharge Base: Prepare your discharge base by mixing it with a discharge activator according to the manufacturer's instructions. Make sure to use a small amount at first to avoid wastage.
- Test the Discharge Effect: Before printing your design, it's essential to test the discharge ink on a sample fabric to check for the color removal effect and the softness of the print. The goal is to lighten the fabric color enough to make the design pop.
3. Applying the Discharge Ink Layer
Once the discharge base is prepared, apply the ink to the fabric using your screen printing setup.
- Low Pressure Squeegee: Use a low-pressure squeegee to apply the discharge base evenly. This will help prevent the fabric from stretching or shifting during the printing process.
- Curing: Once applied, cure the discharge ink at the recommended temperature. This activates the discharge process, bleaching out the color beneath the print.
Be mindful not to over-cure the discharge ink. Over-curing can lead to fabric degradation and loss of softness.
4. Adding the Plastisol Ink Layer
After the discharge ink layer is cured and cooled, it's time to add the plastisol ink layer. The plastisol ink will sit on top of the fabric and will bring vibrant color to the print.
- Thin Plastisol Ink Layer: Apply a thin layer of plastisol ink over the discharged area. You can use a squeegee to gently spread the ink and avoid pressing too hard, which can affect the softness of the final print.
- Layering for Boldness: For more vibrant prints, you can add additional layers of plastisol ink. The key is to avoid overloading the fabric with ink, as this can result in a stiff print. A single, thin layer usually provides the best results.
5. Curing the Plastisol Ink
Plastisol inks need to be cured at a higher temperature than discharge inks. This ensures that the ink properly fuses with the fabric fibers and remains durable over time.
- Curing Temperature: Cure the plastisol ink at the recommended temperature, usually around 320°F (160°C) . Make sure to check your curing process to avoid overheating the fabric.
- Curing Time: Plastisol ink typically cures faster than discharge ink, so it's essential to monitor the curing time to avoid overexposure to heat, which could affect the fabric's texture.
6. Post-Curing and Final Touches
After curing, it's crucial to check your prints for consistency in both color and feel. While discharge ink provides a soft, breathable finish, plastisol ink can sometimes add a slight texture due to its oil-based nature. To ensure maximum softness, consider adding an optional post-curing wash to soften the plastisol layer further.
Tips for Combining Discharge and Plastisol Inks
1. Use a Discharge-Ready Plastisol Ink
Some plastisol inks are formulated to work well with discharge prints. These inks are designed to bond with the fabric after the discharge process, ensuring that the final result is both vibrant and soft. Consider using these specialized inks for the best outcome.
2. Mind the Curing Process
Both discharge and plastisol inks have specific curing requirements. It's essential to cure each layer at the appropriate temperature and time to avoid damaging the fabric. Always use a heat press or a flash cure unit to carefully monitor and control the curing process.
3. Test Your Ink Combinations
Before committing to a large print run, always test your ink combination on a sample fabric. This will allow you to fine-tune your technique and ensure that both the discharge and plastisol inks are working together harmoniously.
4. Work with Thin Layers
When combining discharge and plastisol inks, it's important to work with thin layers of both inks. Thick layers can result in a heavy print that feels stiff rather than soft. Thin layers preserve the softness of the fabric and the vibrancy of the design.
Conclusion
Combining discharge and plastisol inks can give you the best of both worlds: ultra-soft prints with the vibrancy of plastisol. The discharge ink creates a soft, breathable base that allows the fabric to remain flexible, while the plastisol ink adds color and durability to the design. By following the right steps and using the right materials, you can achieve stunning prints that stand out for their vibrant colors and luxurious feel. With careful preparation, testing, and curing, you'll be able to create high-quality designs on dark fabrics that maintain their softness and vibrancy for a long time.