The Causes and Solutions for Pinhole White Exposure in Full-Page Printing

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Introduction: Full-page black printing on high-grammage, high-bursting-strength coated kraft linerboard used for notebook and LCD monitor packaging is prone to pinhole white exposure. This section explores the causes and offers solutions.

Causes of Poor Printing Quality

A. Surface Sizing
To enhance bursting strength and moisture resistance, base paper is often surface-sized, typically through immersion. While this improves moisture resistance, it may reduce water absorption during printing, especially for full-page solid or dot printing.

B. High Proportion of Waste Paper in Raw Materials
Environmental concerns have led to increased use of recycled materials. However, waste boxboard paper often contains impurities such as adhesives, which can adhere to the paper surface and cause white spots during water-based printing.

Five Improvement Measures

1. Use higher-grade ink with finer and more evenly distributed pigment particles.
2. Increase the ink application volume appropriately.
3. Adjust the pH value of the water-based ink and add chemical additives.
4. Apply special surface treatments to the cardboard.
5. Optimize the base paper surface coating process.

Recommendations

Avoid large-area full-page solid printing due to the following disadvantages:

A. Environmental Impact
Full-page printing complicates recycling, increases energy consumption, and raises wastewater treatment costs.

B. Resource Waste
Excessive ink and water usage, along with printing defects such as misalignment and white spots, increase production waste and labor costs.

C. Increased Packaging Costs
Full-page printing can reduce cardboard thickness and compressive strength, increasing the risk of damage during logistics. This necessitates higher material grades and safety factors, raising overall packaging costs.

Therefore, it is recommended to minimize the use of large-area full-page printing unless necessary for product display or marketing purposes.