How to Avoid & Remove DTG Pretreatment Box Stains

Introduction

This tutorial provides essential steps to avoid and remove box stains that can occur during the direct-to-garment (DTG) printing process. Box stains appear as square discolorations on garments due to pretreatment application and can affect the final appearance of your apparel. By understanding the causes and solutions, you can ensure your garments come out bright and stain-free.

Step 1: Understand Box Stains

• Box stains are square discolorations resulting from the application of pretreatment liquid.
• They typically appear during the curing process when pressure is applied from the heat press.
• Common in DTG printing, these stains can be difficult to remove if not addressed properly.

Step 2: Avoid Excess Pretreatment

• Applying too much pretreatment liquid can lead to a thick build-up, resulting in box stains.

The required amount of pretreatment depends on the fabric type

• Use less pretreatment on thinner fabrics like polyester.
• Apply more on thicker fabrics like cotton.
• Focus on applying pretreatment evenly and with light pressure.
• Consider using a pretreatment machine, like the Viper Mini, for consistent application.

Step 3: Manage Pressure Settings

• Ensure enough pressure is applied for the heat press to remain closed, but avoid over-pressing.
• Excessive pressure can crush the liquid particles into the fabric, leading to stains.
• Adjust the pressure settings to maintain the balance necessary for effective curing without damaging the fabric.

Step 4: Control Heat Levels

• Set your heat press to approximately 330 degrees Fahrenheit to prevent burning and staining.
• Higher temperatures can leave visible marks on the fabric.
• Refer to the pretreatment liquid's instructions for specific curing times to ensure optimal results.

Step 5: Use Teflon Sheets

• Always use a Teflon sheet when heat pressing to protect your garments.
• Teflon sheets prevent direct contact between the heat press and the fabric, reducing the risk of burns.
• If you run out of Teflon sheets, be cautious, as skipping this step can lead to damaging your garments.

Step 6: Remove Existing Box Stains

If you encounter box stains, the following methods can help remove them:

• Washing: Wash the garment two or three times in a standard washing machine.
• Steaming: Use a steamer or traditional steam iron on the stains. Ensure you use an ironing board for safety.
• Spraying: Apply peroxide or aerosol sizing to the stained areas and run the garment in a standard clothes dryer.

Conclusion

To prevent and manage box stains during the DTG printing process, pay attention to the amount of pretreatment, pressure, heat, and always use protective sheets. If stains do occur, washing, steaming, or spraying are effective remedies. By following these steps, you can enhance the quality of your printed apparel and achieve a vibrant, professional finish.