How to choose kraft paper?

There are four key points for selection: by color, by function, by material, and by weight.

1. By color

Kraft paper comes in many colors, such as original color kraft paper, white kraft paper, two-color kraft paper, etc. The most common ones are original color kraft paper and white kraft paper.

The original color kraft paper is yellowish brown, the fiber texture on the surface of the paper is clearly visible, and the touch is rough. The manufacturing process of original color kraft paper is very simple and does not require bleaching, coloring and other processes, so the material used is clear at a glance. In addition to being used to make packaging paper, this type of kraft paper is often used in some food packaging.

White kraft paper is decolored by bleach during production. Although it looks similar to ordinary white cardboard or copy paper, it still retains the strong and durable characteristics of kraft paper.

2. By function

Kraft paper has a wide range of uses. In order to adapt to different environments, kraft paper can be divided into ordinary kraft paper and waterproof kraft paper.

The shopping bags and envelopes we use are made of ordinary kraft paper, which has a simple production process and low cost; waterproof kraft paper is made by coating the surface of ordinary kraft paper with composite glue to make the paper waterproof. Generally, food packaging bags used in restaurants and hotels are made of single-layer waterproof kraft paper, which can effectively prevent fashionable oil stains and liquids from leaking out.

3. According to material

(1) Raw pulp kraft paper

Raw pulp kraft paper uses pure wood pulp as raw material. Since it is made from natural substances, its quality is better. high. However, due to material costs, the selling price is relatively high.

(2) Recycled kraft paper

Recycled paper is recycled from waste paper. The product after secondary processing has low production cost and very cheap price. However, this kind of recycled paper The color of the paper is dull and not as bright as the original pulp paper. It lacks some sense of class when used as wrapping paper, but it does not affect its use.

4. According to gram weight

The gram weight of kraft paper is divided into three categories: low weight kraft paper (below 70 grams), intermediate weight kraft paper (70-200 grams), high weight kraft paper Gram-weight kraft paper (above 200 grams). The greater the weight, the greater the fiber density of the paper, the stronger the paper, and the higher the selling price.

Extended information:

1. Kraft paper is a tough and water-resistant packaging paper. It is brown in color and has a wide range of uses. It is often used to make paper bags, envelopes, homework books, record sleeves, and files. and sandpaper etc. The basis weight range is from 80 g/m2 to 120 g/m2. There are roll paper and flat paper, single-sided light, double-sided light and striped paper.

2. The main quality requirements are flexibility and strength, high burst resistance, and the ability to withstand large tensile forces and pressures without breaking. Kraft paper has high tensile strength and is available in single gloss, double gloss, striped, and grainless, etc. Mainly used for packaging paper, envelopes, paper bags, etc. and printing machine drum lining.

3. The quality of kraft paper mainly depends on the fiber density. Paper with higher density has better toughness and will not be easily damaged when pulled by external forces. It is especially suitable for making packaging bags and shopping bags. Denser kraft paper provides better load-bearing capacity.

4. Kraft paper printing can use flexo printing, gravure printing, offset printing, and screen printing processes. As long as you are proficient in the essentials of printing technology, familiar with the printing ink and the printing suitability of kraft paper, reasonably select and deploy inks, and control equipment parameters to achieve the best quality results.

Baidu Encyclopedia-Kraft Paper