kraft paper specifications
Kraft paper is a type of paper that is produced from wood pulp, typically from pine or spruce trees, which gives it its characteristic strength and durability. It is commonly used for packaging, wrapping, and various industrial applications. The specifications of kraft paper can vary depending on its intended use and manufacturing process, but here are some general specifications you might encounter:
Basis Weight: Kraft paper is typically measured in basis weight, which is the weight of a ream (500 sheets) of paper in pounds (lb) or grams per square meter (gsm). Common basis weights for kraft paper range from 30 lb (50 gsm) to 90 lb (150 gsm) or more. Heavier weights are often used for more robust packaging applications.
Color: Kraft paper is naturally brown due to the unbleached pulp used in its production. However, it can also be bleached to produce white or lighter shades of kraft paper.
Finish: Kraft paper can have various finishes, including plain, smooth, or textured. The finish may affect its printability and appearance.
Thickness: The thickness of kraft paper is usually measured in points or mils (1 mil = 1/1000 inch). Common thicknesses range from 4 to 20 mils.
Strength: Kraft paper is known for its strength and durability. The strength properties, such as tensile strength and burst strength, may vary depending on the specific grade and intended use of the paper.
Roll or Sheet Size: Kraft paper can be supplied in rolls or sheets, with various standard sizes available depending on the manufacturer and application. Roll widths can range from a few inches to several feet.
Coating: Some kraft paper may have coatings or laminates applied to enhance certain properties, such as moisture resistance or barrier properties.
Recycled Content: Eco-friendly kraft paper often contains a percentage of recycled content, which can vary depending on the product.
Printing Compatibility: The printability of kraft paper can vary depending on its finish, color, and coating. Some kraft paper is designed for easy printing, while others may require specialized inks or printing methods.
FDA Compliance: If the kraft paper is intended for food packaging, it may need to comply with FDA regulations regarding food contact materials.
Customization: Manufacturers can produce kraft paper with custom specifications to meet specific customer requirements, including size, weight, and color.
It's important to note that kraft paper is versatile and can be produced in various grades and specifications to meet the needs of different industries and applications. When purchasing kraft paper, it's essential to specify the exact requirements to ensure you receive the appropriate product for your intended use.
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