Common Problems and Solutions for PP Woven Bag Printing
PP woven bags are widely used for packaging rice, flour, animal feed, fertilizer, cement, and other industrial products. However, during the printing process, various quality problems may occur, affecting both appearance and brand image.
This article introduces the most common PP woven bag printing problems, explains their causes, and provides practical solutions to help importers, brand owners, and distributors improve printing quality and reduce defects.
1. Ink Adhesion Problems in PP Woven Bag Printing
Problem Description
Poor ink adhesion is one of the most common PP woven bag printing problems. After printing, the ink may peel off, fade, or scratch easily during handling or transportation.
Main Causes
- Low surface tension of PP woven fabric
- Insufficient or uneven corona treatment
- Inappropriate ink formulation
- Printing before corona-treated fabric loses effectiveness
Solutions
- Ensure proper corona treatment before printing (surface tension ≥ 38 dynes)
- Use inks specifically designed for PP woven bags
- Control the time between corona treatment and printing
- Perform adhesion testing before mass production
Proper surface treatment is essential for solving ink adhesion problems in PP woven bag printing.
2. Color Difference and Color Fading Issues
Problem Description
Printed colors may differ from the approved sample, or fade after exposure to sunlight, friction, or moisture.
Main Causes
- Inconsistent ink mixing
- Poor ink quality or unstable pigments
- Inaccurate color matching
- Insufficient drying or curing
Solutions
- Use standardized color formulas and Pantone references
- Mix ink consistently for each batch
- Improve drying conditions during printing
- Use UV-resistant inks for outdoor or long-term storage bags
Effective color control is critical to maintaining stable PP woven bag printing quality.
3. Printing Misalignment and Overprint Errors
Problem Description
Misalignment occurs when printed patterns or colors do not line up correctly, resulting in blurred logos or overlapping text.
Main Causes
- Inconsistent fabric tension
- Mechanical instability of printing machines
- Incorrect plate installation
- Improper registration adjustment
Solutions
- Maintain stable tension during printing
- Regularly calibrate and maintain printing equipment
- Ensure precise plate positioning
- Conduct trial runs before mass production
Reducing misalignment is key to improving the visual quality of PP woven bag printing.
4. Scraper Marks and Printing Streaks
Problem Description
Scraper marks or streaks may appear as lines or uneven ink distribution on the bag surface.
Main Causes
- Worn or damaged scrapers
- Excessive scraper pressure
- Ink viscosity too high or too low
- Dirty printing plates
Solutions
- Replace scrapers regularly
- Adjust scraper pressure properly
- Control ink viscosity according to production standards
- Clean printing plates frequently
Careful equipment adjustment helps prevent surface defects in PP woven bag printing.
5. How to Improve Bolsas tejidas de PP Printing Quality
To avoid repeated printing defects, manufacturers and buyers should focus on overall quality control, including:
- Strict raw material inspection
- Proper corona treatment management
- Stable printing environment and equipment
- Experienced operators and standardized procedures
- Final inspection before shipment
Choosing a professional PP woven bag manufacturer with advanced printing technology and strict quality control is one of the most effective ways to reduce printing problems and ensure consistent product quality.
Conclusion
Understanding common PP woven bag printing problems and their solutions can help buyers make better decisions and reduce production risks. From ink adhesion and color control to alignment and surface defects, every detail matters in achieving high-quality printed PP woven bags.
If you are looking for a reliable supplier who can provide stable printing quality and professional technical support, working with an experienced manufacturer is the key to long-term success.
Looking for a Reliable PP Woven Bag Manufacturer?
Printing quality control process often come from unstable materials, improper surface treatment, or lack of experience. Choosing a professional PP woven bag manufacturer is the most effective way to avoid repeated printing defects.
At Pinyue, we specialize in PP woven bag manufacturing with advanced printing technology, strict quality control, and stable color performance.
Our bags are widely used for rice, flour, animal feed, fertilizer, and industrial packaging.
If you need customized PP woven bags with reliable printing quality, feel free to contact us for technical support or a free quotation.