What is the raw material for kraft paper?
Source： Publish：2022-04-04
Kraft paper is produced on paper machines with moderate machine speeds. The raw material is normally softwood pulp from the kraft process. Maintaining a high effective sulfur ratio or sulfidity is important for the highest possible strength using the kraft process.
As the main packaging material, kraft paper has high strength and is usually yellowish-brown. Semi-bleached or fully-bleached kraft paper is hazel, cream or white. Quantitative 80～120g/m2. The fracture length is generally more than 6000m. High tear strength, work to rupture and dynamic strength. Existing kraft paper is made of kraft softwood pulp as raw material, which is beaten and made on a Fourdrinier paper machine. It is widely used in cement bag paper, envelope paper, plastic sealing paper, asphalt paper, cable protection paper, insulating paper, etc. For the packaging of frozen food, the use of high-strength materials as packaging is also a key consideration. This material must be able to withstand the thermal expansion and contraction of low-temperature freezing and high-temperature thawing, and prevent deformation, distortion, wrinkling, and excessive moisture absorption. In the case of food, from these aspects, natural kraft paper is more suitable.
However, due to the decreasing global forest resources, especially the coniferous forest resources, which take 20-25 years to generate, are even more scarce. In order to protect the environment, advocate green life. JXD's natural kraft paper is all wood-free, and the raw materials are bamboo pulp and bagasse.
Here is an introduction to the raw materials and production process of JXD's bamboo pulp kraft paper:
Bamboo fiber has been well developed in the field of packaging materials because of its slenderness and high mechanical strength. The existing pure bamboo pulp refined white kraft paper uses 100% bleached bamboo pulp to produce food packaging and coating decoration materials. 100% environmentally friendly, harmless to health, and also 100% degradable. JXD's wood-free kraft paper is available in food grade suitable for food packaging and industrial grade suitable for industrial packaging, such as cement bag manufacturing.
>Bamboo Fiber Pulp Molded Tableware
>Bagasse Fiber Pulp Molded Tableware
a whole bamboo pulp natural color kraft paper and production method thereof, the method comprises the following steps: pulp species selection, loosening, beating, batching and papermaking; it is characterized in that:
1) Selection of pulp type: 100% bamboo pulp is used for pulping, and the bamboo pulp used is refined and high-yield pulp, and the fiber has better flexibility;
2) Decompression: The high-yield pulp is fully decompressed to improve the dispersion effect;
3) Screening: After dispersing, the pulp is screened to remove fine components and improve the interweaving force;
4) Beating: using a higher beating concentration, preferably 5-8%; beating degree 40-60OSR, preferably 50-55 OSR; wet weight 8-14g, preferably 10-12g;
5) Ingredients: The concentration of ingredients is 3-5%. The added accessories include cationic polyacrylamide, cationic starch, alkyl ketene dimer emulsion sizing agent, and PAE wet strength agent. The optimized dosage per ton of pulp is cationic polyacrylamide 150 -300g, cationic starch 8-16kg, alkyl ketene dimer emulsion sizing agent 8-12kg, PAE wet strength agent 6-10kg;
6) Papermaking: Fourdrinier paper machine, then surface sizing and calendering finishing, and finally rolled into finished products.
A kind of pure bamboo pulp unbleached kraft paper and a production method thereof are disclosed here. The method includes the following steps: pulp type selection, decompression, beating, batching and making; In the existing market, kraft paper has the advantages of low cost, environmental protection and good hue.
For more information about bamboo pulp, sugarcane pulp and other environmentally friendly wood-free papermaking raw materials, as well as the corresponding kraft paper, sugarcane pulp injection molding tableware, bamboo pulp injection molding tableware, please check our website, or contact us.