How to evaluate the advantages and disadvantages of papermaking raw materials

Papermaking uses the fiber cells of the plant fiber material that have a slender, thick-walled, hollow, and sharp-end morphology. In addition, the plants also contain unequal amounts of various individuals and are of various shapes and sizes. Thin-walled or thick-walled nonfibrillar cells, also known as heterocysts. The fiber morphology of fibers in different plant fiber raw materials, ie, cell length, thickness, and cell wall thickness, are also different. From the analysis of the forming mechanism and performance of paper and paperboard, the evaluation of the advantages and disadvantages of plant fiber raw materials for papermaking is mainly based on the analysis of fiber cell content and fiber morphology. In general, the fiber cell content is large, the heterocytic cell content is low and the species is small, the fiber cell length is large, the fiber cell wall is thin, and the cell cavity diameter is large (the ratio of wall cavities is small). Such a raw material is advantageous for producing stronger paper and cardboard. .

Fibrous cells of softwood account for more than 90%-95% of the total cell amount. There are few kinds and types of heterocells, and their fiber length is large. The average length is 3~4mm, and the longest is more than 8mm. The diameter is 0.03mm or so. Therefore, softwood is suitable for the production of paper or paperboard, such as paper bag paper, kraft paper, and kraft paper board.

Hardwood fiber cells account for about 60% of the total wood cells, and the rest are non-fibroblasts. The average length of fiber cells is only about 1.0mm, and the width is also small, only 1/2~1/3 of the softwood. Therefore, hardwoods are suitable for the production of paper or paperboards with smooth surfaces and low strength requirements.

î—¥ î—¥ non-wood fiber materials used in grassy plants, such as reeds, rice straw and so on. Their fiber cell content is small, the fiber morphology is small and soft, the content of heterocells is large and the morphology is complex. Therefore, it is suitable for the production of general culture paper, low-grade packaging paper, etc. with low strength requirements, and it can also be used to make some paper with long-fiber pulp. And low board.

According to the number of uses of fiber raw materials, compared to the initial use of fiber raw materials, the recycled waste paper fiber raw materials are called secondary fibers. The more fiber raw materials are recycled, the more damage the fibers are subjected to. The more you drop, the more you drop.

î—¥ î—¥ Different fiber materials can be mixed and matched to make paper or cardboard with different properties.

î—¥ î—¥ China's forests cover a small area and there is a shortage of wood resources. Therefore, grass resources and secondary fibers should be fully utilized.