Guide to Buy Packing Wrapping Paper in Haimu

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1. Printing Issues
Problems:
● Poor ink absorption, leading to slow drying and smudging.
● Uneven color distribution and blurry images.
● Poor ink adhesion, especially with UV printing.
Solutions:
✅ Use fast-drying inks or UV-curable inks and adjust printing pressure accordingly.
✅ Opt for low-viscosity inks to improve print uniformity.
✅ Perform surface treatments such as corona treatment or priming to enhance ink adhesion.


2. Die-Cutting and Waste Removal Issues
Problems:
● Cast coated paper is brittle, making it prone to cracking or chipping during die-cutting.
● Difficult waste removal, reducing production efficiency.
● Uneven cutting edges, leading to labels peeling off or rough edges.
Solutions:
✅ Use sharp die-cutting blades to improve precision and minimize edge cracking.
✅ Adjust die-cutting pressure to prevent paper breakage.
✅ Modify the waste removal process by widening waste edges or optimizing the cutting layout.


3. Adhesion Problems
Problems:
● The glossy surface makes it difficult for adhesives to bond properly.
● Labels may curl or lose adhesion over time.
● Adhesive performance weakens in cold or humid environments.
Solutions:
✅ Choose high-tack adhesives specifically designed for cast coated paper.
✅ Ensure labels are fully dry before storage to prevent adhesive degradation.


✅ Use suitable release liners (e.g., glassine or PET) to prevent curling.



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4. Water and Abrasion Resistance
Problems:
● Exposure to moisture can cause bubbling or coating detachment.
● Labels are prone to scratching or wear over time.
Solutions:
✅ Select waterproof cast coated paper or apply an additional water-resistant coating.
✅ Use scratch-resistant coatings or lamination to enhance durability.
✅ Apply UV varnish for extra abrasion resistance.


5. Warping Due to Temperature and Humidity Changes
Problems:
● Paper deforms when exposed to moisture, affecting label application.
● High temperatures can soften the coating, reducing adhesion quality.
Solutions:
✅ Store in a controlled environment (recommended: 20-25°C, 40-60% humidity).
✅ Avoid prolonged exposure to heat or humidity during transport.
✅ Use thicker or composite materials for better stability.


6. Environmental and Regulatory Compliance
Problems:
● Some coatings may not comply with environmental regulations, affecting exports.
● Cast coated paper is less recyclable, increasing sustainability concerns.
Solutions:
✅ Choose materials that meet ROHS, REACH, or other regulatory requirements.
✅ Use eco-friendly water-based coatings to minimize chemical impact.
✅ Opt for recyclable or biodegradable label materials to align with sustainability goals.



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Conclusion

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Cast coated paper is widely used in the labeling industry but presents challenges such as printability, die-cutting, adhesion, and durability. By optimizing ink selection, adjusting cutting processes, improving adhesives, and enhancing resistance properties, its performance can be significantly improved. If your company faces specific issues during the printing process, feel free to provide more details, and I can help you find tailored solutions!

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When using metallized paper for label production, several common issues may arise. Below is a list of potential problems and corresponding solutions:


1. Printing Issues
Problems:
● Poor ink adhesion: The smooth metallized surface makes it difficult for regular inks to adhere, leading to ink peeling or blurring.
● Slow drying speed: The metallized layer reduces ink absorption and evaporation, causing longer drying times and lower production efficiency.
● Low color reproduction accuracy: The reflective nature of the metallized surface can affect color presentation, leading to deviations in print color.
Solutions:
✅ Use specialized inks (such as UV or water-based inks) to improve adhesion and drying speed.
✅ Apply corona treatment or pre-coating to increase surface energy and improve ink adhesion.
✅ Use a white base layer or adjust color management settings to compensate for the reflective effect.


2. Coating and Surface Treatment Issues
Problems:
● Poor adhesion of UV varnish or lamination: The low surface energy of the metallized paper may cause coatings or varnish layers to peel off.
● Low surface tension: This can affect ink, coating, and adhesive performance, leading to poor processing results.
Solutions:
✅ Use corona treatment or pre-coating layers to increase surface energy, improving the adhesion of UV varnish, lamination, or top coatings.
✅ Choose specially formulated UV varnish or water-based coatings designed for metallized paper.
✅ Store the paper in a dry environment to prevent moisture from affecting the metallized layer.


3. Die-cutting and Processing Issues
Problems:
● Edge cracking or aluminum layer peeling: The metallized layer may detach during die-cutting, affecting the label’s appearance.
● Aluminum layer separation after cutting: The metallized coating may peel off when the label is bent or folded, reducing product quality.
Solutions:
✅ Use high-quality die-cutting blades and optimize pressure settings to prevent cracking or peeling.
✅ Choose flexible metallized paper to enhance adhesion and resistance to folding.
✅ Adjust the die-cutting angle to minimize direct impact on the metallized layer, reducing peeling risks.



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4. Adhesion Issues
Problems:
● Weak adhesive bonding: The metallized layer can interfere with glue adhesion, making labels difficult to stick.
● Bubbles or detachment: Adhesives may form bubbles or fail in high humidity or high-temperature environments.
Solutions:
✅ Use adhesives specifically designed for metallized surfaces, such as high-adhesion solvent-based adhesives.
✅ Apply a primer or coating layer to enhance the adhesive’s bonding ability.
✅ Control humidity levels to prevent moisture absorption, which could impact adhesion performance.


5. Durability and Storage Issues
Problems:
● Moisture absorption and warping: Metallized paper has higher moisture sensitivity, leading to deformation when improperly stored.
● Poor heat resistance: High temperatures may cause oxidation or discoloration of the metallized layer.
Solutions:
✅ Store in a dry and temperature-controlled environment (recommended humidity < 50%, temperature 20-25°C).
✅ Use moisture-proof packaging to prevent humidity damage during storage and transportation.
✅ Avoid direct sunlight and high temperatures to prevent oxidation or discoloration of the metallized layer.


6. Environmental and Regulatory Issues
Problems:
● Difficult to recycle: Some metallized papers are harder to recycle due to the presence of the aluminum layer.
● Food safety concerns: Some metallized coatings may not comply with food packaging regulations.
Solutions:
✅ Choose eco-friendly and recyclable metallized paper, such as water-based coated metallized paper.
✅ Ensure compliance with FDA, EU, and other food safety standards, especially for food packaging labels.
✅ Reduce the use of solvent-based chemicals in production and adopt environmentally friendly coating technologies to lower pollution risks.



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Summary Table




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Issue Category



Specific Problems



Solutions





Printing Issues



Poor ink adhesion, slow drying, color inaccuracy



Use specialized inks, pre-treatment, and white base layers





Coating Issues



Poor varnish or lamination adhesion



Increase surface tension with corona treatment, use proper coatings





Die-cutting Issues



Edge cracking, peeling, aluminum layer detachment



Optimize cutting pressure, use flexible metallized paper





Adhesion Issues



Weak bonding, bubbling, label detachment



Use high-adhesion adhesives, improve surface treatment





Durability Issues



Moisture warping, heat sensitivity



Store in dry conditions, use moisture-proof packaging





Environmental Issues



Recycling difficulties, food safety concerns



Use recyclable materials, meet safety standards






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🔹 If your customers are printing companies or label manufacturers, consider offering customized metallized paper solutions based on different applications, such as:

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● High-adhesion metallized paper for UV printing
● Heat-resistant