Method for producing dry type duplicating body paper

Abstract

The invention belongs to a papermaking technology, and relates to a method for producing dry type duplicating body paper. The method comprises the following steps of: making finished paper by crushing, grinding and mixing basic raw materials of bleached chemical broad-leaved wood pulp and bleached chemical softwood pulp, sizing, dehydrating, pre-drying, performing surface sizing, post-drying, glossing and coiling; during manufacturing, adding fillers, an inner sizing agent, a wet-strength agent and a surface sizing agent, wherein the two basic raw materials comprise 65-85 percent of bleached chemical broad-leaved wood pulp and 15-35 percent of bleached chemical softwood pulp, and the fillers comprise titanium dioxide and calcium carbonate; adding the titanium dioxide during pulp crushing, wherein the adding amount is 20-60 kilograms for per ton of paper; and adding the calcium carbonate during pulp mixing, wherein the adding amount is 120-280 kilograms for per ton of paper. With the method, the production cost can be reduced, the yield is improved, and the non transparency of a product is improved.

Description

technical field [0001] The invention belongs to papermaking technology, and relates to a production method of dry copying base paper. Background technique [0002] The existing dry copy base paper production method is that the mixed wood pulp basic raw material of bleached chemical hardwood pulp and bleached chemical softwood pulp is pulped, refined, blended, sized, dehydrated, pre-dried, surface sizing, After drying, calendering, coiling and other processes to make paper, fillers, internal sizing agents, wetting strength agents, surface sizing agents and other additives are added in the manufacturing process. [0003] In the traditional methods mentioned above, titanium dioxide and calcium carbonate are usually selected as fillers, and fillers are generally added during the pulping or sizing process. In this method, more fillers are lost during the dehydration process, and titanium dioxide is expensive, and the use of traditional processes will cause paper production costs....

AI Technical Summary

Problems solved by technology

[0003] In the traditional methods mentioned above, titanium dioxide and calcium carbonate are usually selected as fillers, and fillers are generally added during the pulping or sizing process. In this method, more fillers are lost during the dehydration process, and titanium dioxide is expensive, and the use of traditional processes will cause paper production costs. In addition, due to the unreasonable selection ratio of fillers and the loss of fillers will reduce the opacity of the dry copy paper, it is difficult to meet the higher requirements for use; in addition, the back of the dry copy paper needs to be coated, so for There are strict requirements on the coating absorption and wet deformation of base paper. The actual production effect of adding internal sizing agent in the traditional method is not good, and it is easy to cause wrinkles, unevenness, and peeling off of the colored coating on the back of the dry copy paper. Seriously affect the improvement of qualified product rate