How was kraft paper invented? How was it applied to the packaging industry all at once, and it is now prevalent in survival, so today I will take you to talk about this topic, and individuals can also take a look and learn.
Introduction of Kraft Paper:
1. Kraft paper is used as a packaging material, with very high strength, usually yellow-brown, and half-bleached or fully-bleached kraft pulp is light brown, cream or white.
2. Quantitative 80~120g/m2. The fracture length is usually more than 6000m.
3. The crushing work, tear resistance, and dynamic strength are very high, mostly web paper, but also flat kraft paper.
4. Using sulfate softwood pulp as raw material, after beating, it is made on a Fourdrinier paper machine.
5. It can be used as cement bag paper, envelope paper, plastic sealing paper, asphalt paper, cable protection paper, insulating paper, honeycomb wrapping paper, etc.
The use of kraft paper
1. Long ago, “kraft paper” was made from calf hides. Obviously, this kind of “kraft paper” is only used when making drum skins; and the kraft paper you use for wrapping books is made of conifer wood fibers through chemical methods after people have learned the skills of papermaking. The pulp is put into a beater for beating, and then sizing materials, dyes, etc. are added to make paper in a paper machine.
2. Because the color of this paper is yellowish-brown and the paper is firm, it is very similar to kraft paper, so people call it kraft paper.
3. The kraft paper made by this method is usually used for packaging and printing, and can also be used for other cartons and cartons.
4. Obviously, there is not much difference between the manufacturing method of kraft paper and ordinary paper. Why is kraft paper stronger than ordinary paper?
5. This is mainly because the wood fiber used for making kraft paper has a relatively long strength, and when cooking the wood, it is treated with caustic soda and sulfide alkali chemicals, and the chemical effect they play is moderate, and the original strength of the wood fiber. The proportion of damage suffered is small, so the paper made of this pulp is firmly interdependent between fibers, so the kraft paper is very strong.
6. Kraft paper is a sturdy and water-resistant packaging paper, brownish-yellow, and has a wide range of uses. It is often used to make honeycomb paper bags, envelopes, record sleeves, honeycomb wrapping paper, files and sandpaper.
7. The quantitative range is from 40g/m2 to 120g/m2, with the difference between web and paperboard, single-sided gloss, double-sided gloss and striped.
8. The important quality requirements are flexibility and strength, high bursting resistance, and can withstand greater tension and pressure without breaking.
9. Kraft paper has high tensile force, with single light, double light, stripe, no grain and so on. Mainly used for wrapping paper, envelopes, paper bags, etc. and printing press cylinder lining.
