What Is Kraft Paper and How Is It Used
Kraft paper is a strong, water-resistant paper with a brownish-yellow color, used in bags, envelopes, packaging, and printing. Basis weight 80 to 120 g/m2, color variation normal, recyclable.
What Kraft Paper Actually Is
Kraft paper is a strong, water-resistant paper with a brownish-yellow color, made from wood pulp. It is used for packaging, bags, envelopes, files, record sleeves, workbooks, and as linings for printing press drums. Its strength comes from high tensile and burst resistance, allowing it to hold up under tension and pressure without tearing.
Key Properties and Quality Requirements
The main quality requirements for kraft paper are flexibility, high strength, and resistance to tearing under stress. It must withstand the forces of handling, folding, and packaging without breaking. The basis weight ranges from 80 g/m2 to 120 g/m2, depending on the application.
How Kraft Paper Is Classified
Kraft paper is grouped by color, use, and material. By color: primary color, red, white, flat, single-gloss, double-gloss, and two-color. By use: packaging, waterproof, moisture-proof, anti-rust, pattern-making, process, insulating, and sticker paper. By material: recycled, core, base, rough, wax-coated, wood pulp, and composite kraft paper.
Why Kraft Paper Is Used in Packaging
Kraft paper is widely used because it is strong, recyclable, and suitable for direct contact with products. It is ideal for paper bags, envelopes, and protective wrapping. Its natural color and texture make it suitable for both functional and aesthetic packaging needs.
Color Variation and Consistency
Color differences in kraft paper are normal and unavoidable due to raw material sources, production batches, seasons, and machines. However, within a single batch, 98% color consistency can be guaranteed. This variation is not a defect but a natural outcome of the manufacturing process.
Related Questions
What is the basis weight range of kraft paper?
The basis weight ranges from 80 g/m2 to 120 g/m2, depending on the intended use and strength requirements.
Can kraft paper be used for waterproof packaging?
Yes, waterproof kraft paper is available and used in applications where moisture resistance is required.
Is kraft paper recyclable?
Yes, kraft paper is made from paper-based materials and can be recycled through standard paper recycling streams.
What are the common sizes for flat kraft paper?
Common printing sizes are 787*1092mm (positive) and 889*1194mm (generous). Custom sizes can be cut using a flat cutting machine.
Can kraft paper be slitted to custom widths?
Yes, a roll slitting machine can cut kraft paper rolls from a minimum of 460mm to a maximum of 1460mm, depending on the machine setup.
What causes color variation in kraft paper rolls?
Color differences come from raw material sources, production batches, seasons, and machines. These variations are normal and cannot be fully controlled.
Is there a standard size for kraft paper rolls?
No, kraft paper has no single standard size. It is classified by use, color, and material, and dimensions are determined by the application and production process.
Put This Into Practice
If you are costing a paper cushioning line, send your volumes and the kraft width you can buy. We will work out what machine that needs.