Method for producing e-commerce special craft paper with low gram weight and high strength by using domestic waste paper

Abstract

The invention relates to a method for producing e-commerce special craft paper with low gram weight and high strength by using domestic waste paper, and belongs to the technical field of papermaking.The method comprises a pulping step and a papermaking step. The domestic waste paper is classified by using a classifying screen, and then long fibers are used for surface layers and short fibers areused for bottom layers. According to the invention, a small amount of fine wood powder is added into bottom pulp, so that the stiffness of the craft paper is improved. Starch and a carboxymethylcellulose (CMC) compounding system are sprayed between the two layers, so that the interlayer bonding force of the craft paper is improved. A dual-element reinforcing agent including starch and polyacrylamide is added in pulp, so that the product strength is improved. In addition, the inner-pulp water resistance is combined with the surface water resistance, and simultaneously an inner-pulp flame retardance technology is combined with an interlayer flame retardance technology, so that the water resistance of craft paper products is improved, and simultaneously the flame retardancy of the products isachieved. Therefore, the method provided by the invention saves energy and is environmentally friendly, and the prepared craft paper products are low in weight, high in stiffness, excellent in waterproof performance and good in flame retardance, and are very suitable for e-commerce special paper boxes.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and relates to a method for manufacturing kraft cardboard. More specifically, the invention relates to a method for producing low-weight and high-strength e-commerce special kraft cardboard by using domestic waste paper. Background technique [0002] Kraft linerboard is a kind of natural color linerboard made of natural wood pulp and waste paper. Kraft linerboard is widely used, mainly for packaging paper. Kraft cardboard is the outermost layer of cardboard (or boxboard, face paper, etc.) for e-commerce cartons. It requires good stiffness and water resistance. Compared with other packaging cardboards, its production technology is relatively high, mainly pulping. , The papermaking process is more complicated, and the quality and technical requirements of the products are also higher. [0003] In recent years, with the continuous increase in resource recycling and the rapid development of the ...

AI Technical Summary

Problems solved by technology

The face paper of the existing e-commerce cartons is generally made of waste paper, and most of them have the disadvantages of low stiffness, poor water resistance, and no flame retardant treatment

The e-commerce carton surface paper produced by imported waste paper (which has long fibers and good quality) is generally of good quality (mainly refers to strength indicators such as stiffness), but the cost of raw materials is high and the pressure on profitability is high

[0004] In the prior art, the use of domestic waste paper to produce linerboard mainly has the following technical problems: (1) The quality of domestic waste paper is poorer than that of imported ones (mainly due to short fibers and low strength), and the quality of the produced e-commerce carton face paper is generally low. Poor, low strength indicators such as stiffness, if the current trend of low weight, this effect is more obvious, so it will cause damage to packaging products; (2) Due to the increase in the use of domestic waste paper, water-resistant treatment of waste paper Compared with virgin wood pulp, it is more difficult, so the conventional sizing agent and surface sizing in the pulp often cannot meet the water resistance requirements, resulting in poor water resistance of e-commerce cartons. In rainy days, especially in the south, it will directly damage the packaged products. Damage or damage, especially electronic products; (3) At present, flame retardant technology is only used in a small amount of high-end packaging boxes or special products, such as export products, a small amount of high-end consumer goods, flammable and explosive products, military products, etc.

Generally, cartons for e-commerce are not treated with flame retardant treatment, which is a hidden danger. Fires may also occur during the transportation or storage of e-commerce boxes, such as fire hazards during mass stacking and transportation.

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