1. Wrinkles in Labels Post-Application
Problem: Wrinkles may appear on self-adhesive labels after they are applied, especially on bottles like wine bottles, which can worsen over time. This often occurs when labels have been sealed in plastic bags before use and have absorbed moisture, leading to swelling and wrinkles.
Precautions & Solutions:
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Acclimatization: Allow labels to acclimatize to the workshop’s humidity for at least 48 hours before use. Open the outer packaging to let the labels balance with the environmental humidity to avoid swelling.
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Change in Labeling Process: Consider using a lamination process instead of varnishing, as lamination helps prevent the label from absorbing external moisture.
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Rehumidification: Implement secondary rehumidification during printing and die-cutting to adjust the moisture content of the labels, especially the backing paper, which is more susceptible to moisture.
2. Curling of Self-Adhesive Materials
Problem: During the rainy season, film-type self-adhesive materials can curl due to the absorption of moisture, particularly by the backing paper. This can lead to difficulties in the printing and die-cutting processes.
Precautions & Solutions:
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Temperature & Humidity Control: Ensure that the workshop maintains a stable temperature of 20-25°C and relative humidity between 50-60%. This is crucial for avoiding issues with curling.
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Local Humidity Adjustment: For areas without full humidity control, use heating elements or hot air fans near the winding section to reduce local humidity.
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Pre-Processing Adjustment: If high humidity is suspected, open the packaging of the materials 24 hours before use to allow the materials to adapt to the workshop’s moisture levels.
3. General Handling and Storage
Problem: Improper handling and storage of self-adhesive labels can lead to unwanted moisture absorption, which affects their performance.
Precautions:
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Proper Packaging: Store self-adhesive labels in moisture-resistant packaging until they are ready to be used. Ensure the packaging allows for air circulation to prevent excess moisture buildup.
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Avoid Direct Water Contact: If possible, avoid direct contact with water, especially for sensitive label materials. For labels exposed to water, ensure the adhesive is water-resistant or waterproof.
4. Label Adhesion and Performance
Problem: Water exposure may weaken the adhesive’s bond, leading to poor performance, especially for products stored in humid or wet environments.
Precautions:
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Water-Resistant Adhesives: Use water-resistant or waterproof adhesives for labels that will be exposed to moisture. This ensures the label remains securely adhered to the surface even in wet conditions.
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Pre-Application Check: Always test the adhesive strength on the intended surface before full application, especially if the label will be exposed to moisture post-application
