Cellulose Packaging

 

A semi-finished product obtained from plant raw materials by the chemical method of separating wood into individual fibers by removing most of the encrusting substances. Methods for the production of cellulose are based on the dissolution of lignin and other substances with appropriate chemicals. The cellulose, therefore, consists mainly of lignin-free fibers that have retained their original length. The fibers have increased strength and elasticity. You produce cellulose from coniferous and deciduous wood, straw, and reed.

There are two main ways of Producing Cellulose
sulfate and sulfite.



Sulfite cellulose
 is a semi-finished product obtained during cooking in an acidic environment? For the sulfite production method, only low resinous conifers are suitable - spruce and fir, and from deciduous, mainly poplar. Sulfite cellulose, due to its whiteness, is used for the production of various types of custom packaging papers and board, where it is necessary to have good printing. In the production of cardboard, this semi-finished product is mainly used for the cover layer. Sulfate cellulose is obtained by cooking wood in the presence of alkali. There are two main methods of alkaline cooking

Soda and Sulfate

In contrast to the sulfite method; alkaline ones are suitable for any kind of raw material, which is their significant advantage. The alkaline cooking method HAS NUMBER OF ADVANTAGES in comparison with the sulfite one.
 It allows the production of pulp from almost all types of wood, including low-grade wood and waste. So, pine, which, due to the high resin content in the sulfite method, can be used with difficulty, is one of the main raw materials for the production of sulfate pulp.
 In the unbleached state, sulfate cellulose has a pronounced brown color. Sulfate cellulose is characterized by higher strength than sulfite pulp, which is explained by the weaker hydrolysis of wood during cooking and almost complete retention of the content of pentosans.

Due to its high strength characteristics, sulfate cellulose is used for the manufacture of strong grades of packaging papers and, above all, sacks paper and kraft-liner board. In addition, sulfite cellulose, as a rule, is used in the production of cardboard from waste paper and other semi-finished products to form a strong cover layer (testliner cardboard, etc.). Sulfate cellulose is the main semi-finished product in the production of packaging types of paper and custom cardboard boxes, and its content in the material largely determines its strength properties.

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