2. Structure and Composition
2.1 Layers
Coated White Surface: The top layer is a white - coated area. This coating is usually made of pigments such as titanium dioxide, along with binders and other additives. The white coating serves to enhance the aesthetic appeal, providing a clean and bright surface for printing high - quality graphics, logos, and product information. It also improves the ink receptivity, ensuring sharp and vivid print results.
Baseboard (Grey Back): The baseboard, which has a grey color on the reverse side, is often composed of recycled fiber pulp, kraft pulp, or a combination of both. Recycled fiber pulp helps in reducing costs and promoting environmental sustainability. Kraft pulp, on the other hand, contributes to the board's strength properties. The composition of the baseboard may vary depending on the quality and performance requirements of the final product.
2.2 Thickness Significance
A 2.0mm thickness is carefully chosen for various packaging applications. It offers sufficient rigidity to protect the packaged items during handling, storage, and transportation. At the same time, it is not overly thick, which would increase material costs and make the packaging cumbersome. This thickness allows for easy folding and shaping into different box designs, such as cartons, folding cartons, and rigid boxes.
3. Performance Characteristics
3.1 Strength and Durability
Tensile Strength: These boards have a reasonable tensile strength, which means they can withstand stretching forces without tearing. This is crucial when the box is filled with products and lifted or stacked. The combination of the fiber composition in the baseboard and the reinforcing effect of the coating contributes to the overall tensile strength.
Compressive Strength: They also exhibit good compressive strength, enabling the boxes to bear the weight of other stacked boxes or external pressure during storage and transportation. The 2.0mm thickness plays a significant role in enhancing the compressive resistance.
Folding Endurance: The boards are designed to have good folding endurance. They can be folded multiple times without cracking or losing their structural integrity. This property is essential for creating boxes with complex folding patterns, such as those with interlocking tabs or multiple panels.
3.2 Printability
Surface Smoothness: The white - coated surface of the board has high smoothness, which is ideal for various printing techniques. Offset printing, flexography, and digital printing can all achieve excellent results on this surface. The smooth surface allows for even ink distribution, resulting in sharp images, fine text, and high - quality color reproduction.
Ink Absorption: The coating is formulated to have appropriate ink absorption properties. It can absorb the ink quickly enough to set the print but not so fast that the ink spreads or bleeds, ensuring that the printed images remain crisp and well - defined.
3.3 Moisture Resistance
While not completely waterproof, these boards have a certain degree of moisture resistance. The coating on the white side can act as a barrier against light moisture, protecting the packaged products from humidity - related damage. However, for applications where high - level moisture resistance is required, additional treatments such as laminating with a plastic film or applying a water - resistant coating may be necessary.
4. Applications in Packaging
4.1 Consumer Goods Packaging
Food and Beverage: They are widely used in the food and beverage industry for packaging items such as snacks, cookies, tea boxes, and bottled beverages. The white - coated surface allows for attractive branding and product information display, while the strength of the board protects the food products from damage during handling and transportation.
Cosmetics and Personal Care: Packaging boxes for cosmetics, skincare products, and toiletries often use these boards. The aesthetic appeal of the white surface is well - suited for presenting high - end and luxury products, and the board's durability ensures that the delicate contents are safeguarded.
4.2 Electronics Packaging
For packaging electronic products like mobile phones, tablets, and small appliances, 2.0mm white laminated sheet boards with a grey back are popular. The boards' strength protects the sensitive electronic components from shock and vibration, and the printable surface can be used to display product features, usage instructions, and safety information.
4.3 Gift Packaging
In the gift - giving industry, these boards are used to create elegant and sturdy gift boxes. The white surface can be printed with festive designs, patterns, or personalized messages, and the 2.0mm thickness gives the box a substantial feel, enhancing the overall presentation of the gift.
5. Production Process
5.1 Pulp Preparation
Recycled Fiber Processing: If recycled fiber is used in the baseboard, it first undergoes a recycling process. This involves sorting, cleaning, and pulping the waste paper. The recycled pulp is then refined to improve its fiber quality and remove any impurities.
Virgin Pulp (if applicable): In some cases, virgin pulp, such as kraft pulp, may be added to the recycled pulp. Kraft pulp is produced from wood chips through a chemical pulping process, typically the kraft process. The combination of recycled and virgin pulp is adjusted according to the desired strength and quality of the final board.
5.2 Board Formation
The prepared pulp is formed into a continuous web on a papermaking machine. The web is then pressed and dried to remove excess moisture and give the board its initial shape and strength.
5.3 Coating Application
Coating Preparation: The white coating is prepared by mixing pigments, binders, and additives in appropriate proportions. The pigments, mainly titanium dioxide, provide the white color and opacity. Binders hold the pigments together and help them adhere to the baseboard. Additives may include dispersants, defoamers, and optical brighteners to improve the coating's performance.
Coating Process: The coating is applied to the surface of the dried board using methods such as blade coating, air - knife coating, or curtain coating. After coating, the board is passed through a drying section to cure the coating and ensure its proper adhesion.
5.4 Finishing and Converting
The coated board is then subjected to finishing operations such as calendering to improve its surface smoothness and gloss. It is then cut into the desired sizes and shapes for further conversion into packaging boxes. The conversion process may involve die - cutting, folding, gluing, and printing to create the final packaging products.
6. Quality Control
6.1 Physical Property Testing
Thickness Measurement: The thickness of the board is measured at multiple points using precision measuring instruments such as micrometers or thickness gauges. Deviations from the specified 2.0mm thickness can affect the board's performance and functionality in packaging applications.
Strength Testing: Tensile strength, compressive strength, and folding endurance are tested using specialized testing equipment. These tests ensure that the board meets the required strength standards for different packaging applications.
6.2 Printability Evaluation
Print Quality Inspection: Samples of the board are printed with standard test patterns using different printing techniques. The print quality is then evaluated for factors such as color accuracy, image sharpness, and ink adhesion. Any issues with printability, such as poor ink transfer or bleeding, are identified and addressed.
6.3 Moisture Content Monitoring
The moisture content of the board is monitored regularly as it can affect the board's strength, dimensional stability, and printability. Moisture meters are used to measure the moisture content, and appropriate drying or humidification processes may be adjusted during production to maintain the optimal moisture level.
7. Market Trends and Future Outlook
7.1 Sustainability
There is a growing trend towards more sustainable packaging solutions. Manufacturers of white laminated sheet boards are increasingly using recycled materials in the baseboard and exploring eco - friendly coating options. This not only reduces the environmental impact but also meets the demands of consumers and brands that prioritize sustainability.
7.2 Technological Advancements
Advances in papermaking and coating technologies are expected to improve the performance of these boards further. New coating formulations may offer enhanced barrier properties, better printability, or improved durability. Additionally, digital printing technologies are enabling more customized and on - demand packaging solutions, which may drive the demand for high - quality white laminated sheet boards.
7.3 Competition and Cost - effectiveness
The packaging industry is highly competitive. Manufacturers are constantly looking for ways to reduce costs while maintaining or improving product quality. This may involve optimizing the production process, using alternative raw materials, or improving supply chain efficiency. As a result, the price - performance ratio of white laminated sheet boards with a grey back is likely to remain an important factor in the market.
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