CN104746373A - Preparation process of broussonetia papyrifera natural-color semi-chemimechanical pulp - Google Patents

Abstract

The invention discloses a preparation process of broussonetia papyrifera natural-color semi-chemimechanical pulp. The preparation process comprises the following steps: (1) crushing broussonetia papyrifera into a sectional material with the length of 35-50mm, and removing dust; (2) feeding the sectional material subjected to dust removal into a boiling device, adding 3-5 percent of NaOH and 0.4-0.6 percent of anthraquinone according to the weight of the sectional material, and processing for 3-4 hours under the condition that the steam pressure is 0.3-0.4MPa; (3) sequentially feeding into a pulp extrusion machine, a double-screw thread-rolling device and a pulp grinding machine after the sectional material is processed in the step (2), thus obtaining coarse pulp; and (4) performing latency on the coarse pulp obtained in the step (3) through a hydrapulper to obtain the broussonetia papyrifera natural-color semi-chemimechanical pulp. Compared with an existing broussonetia papyrifera paper pulp chemical pulp-making method, the preparation process provided by the invention has the advantages of capability of obviously reducing black liquid quantity and reducing the environmental pollution and easiness for processing.

Description

The preparation technology of paper mulberry true qualities semichemical mechanical pulping

Technical field

The invention belongs to pulping and paper-making field, be specifically related to the preparation of paper mulberry true qualities semichemical mechanical pulping.

Background technology

Paper mulberry (formal name used at school Broussonetia papyrifera) calls Chu Tao etc., for deciduous tree, high 10-20m is strong positive seeds, have that fast-growing, strong adaptability, strong stress resistance, distribution are wide, feature that easily breeding, the period of felling in turn are short, all have distribution in the temperate zone of China, the torrid zone.

Generally adopt chemical pulping method with paper mulberry paper pulp at present; mainly contain sulfate process and sulphite process; adopt traditional chemical pulping method can produce a large amount of black liquor, and black liquor is also the primary pollution source of paper industry, this traditional pulping process is more and more difficult to the requirement meeting environmental protection.

Summary of the invention

The object of this invention is to provide a kind of preparation technology of paper mulberry true qualities semichemical mechanical pulping of more environmental protection.

It is as follows that the present invention realizes the technical scheme that above-mentioned purpose adopts:

The preparation technology of paper mulberry true qualities semichemical mechanical pulping, comprises the steps:

(1) paper mulberry is broken into the section material of 35-50mm, dedusting;

(2) the section material after dedusting is sent in boiling vessel, with section material weighing scale, add the anthraquinone of NaOH and 0.4-0.6% of 3-5%, under steam pressure is 0.3-0.4MPa, processes 3-4 hour;

(3) section material is after step (2) process, sends into press master, twin-screw thread rolling machine and fiberizer successively, is slightly starched;

(4) the thick slurry that obtains of step (3) is after hydrabrusher disappears and dives, and namely obtains paper mulberry true qualities semichemical mechanical pulping.

Compared with the chemical pulping method of traditional paper mulberry paper pulp, the present invention can obviously reduce black liquor amount, and more easily processes, and alleviates the pollution to environment.

Detailed description of the invention

Below in conjunction with embodiment, the present invention is described in further details.

Embodiment 1

(1) paper mulberry is sent into disintegrating machine, be broken into the section material of 35-50mm, goat's horn deduster sent into by qualified section material belt conveyor, to remove the heavy seeds such as dust, then sends into deposit feed bin;

(2) the section material laid in feed bin is sent in boiling vessel by conveying worm and is carried out sofening treatment, is specially with section material weighing scale, adds the NaOH of 4% and the anthraquinone of 0.5%, sofening treatment 3.5 hours under steam pressure is 0.35MPa;

(3) after step (2) process, discharging, with conveying worm, material is sent into high dense press master (slurry concentration 30-45wt%), extrude alkali lye wherein, slurry sends into twin-screw thread rolling machine by conveying worm again, carry out sub-wire process, send into high-density paste mill (slurry concentration 25-40wt%) through conveying worm again after sub-wire, slightly starched through defibrination;

(4) hydrabrusher sent into by the thick slurry that step (3) obtains, and after disappearing at a high speed and diving, starches concentration 5wt%, time 10-15min, namely obtain paper mulberry true qualities semichemical mechanical pulping when disappearing latent.

Embodiment 2

(1) paper mulberry is sent into disintegrating machine, be broken into the section material of 35-50mm, goat's horn deduster sent into by qualified section material belt conveyor, to remove the heavy seeds such as dust, then sends into deposit feed bin;

(2) the section material laid in feed bin is sent in boiling vessel by conveying worm and is carried out sofening treatment, is specially with section material weighing scale, adds the NaOH of 4.5% and the anthraquinone of 0.4%, sofening treatment 4 hours under steam pressure is 0.4MPa;

(3) after step (2) process, discharging, with conveying worm, material is sent into high dense press master (slurry concentration 30-45wt%), extrude alkali lye wherein, slurry sends into twin-screw thread rolling machine by conveying worm again, carry out sub-wire process, send into high-density paste mill (slurry concentration 25-40wt%) through conveying worm again after sub-wire, slightly starched through defibrination;

(4) hydrabrusher sent into by the thick slurry that step (3) obtains, and after disappearing at a high speed and diving, starches concentration 4wt%, time 10-15min, namely obtain paper mulberry true qualities semichemical mechanical pulping when disappearing latent.

Unless otherwise indicated, device therefor of the present invention is conventional equipment.

Adopt the inventive method, the yield of paper mulberry true qualities semichemical mechanical pulping can reach 75-80%, weight in wet base 3.5-5g.To produce 110g/m ²fluting medium is example, and the corrugated medium circling pressure index that paper mulberry true qualities semichemical mechanical pulping of the present invention is produced can reach 15.4 N.m/g, and double above than state's corrugated medium circling pressure index produced that gives up, fracture length can reach about 5000M.

In addition, industrial chemicals consumption of the present invention is less, and lignin stripping is few, and water wasting process is more simpler than traditional handicraft, and expense is little.

Claims (1)

1. the preparation technology of paper mulberry true qualities semichemical mechanical pulping, comprises the steps:

(1) paper mulberry is broken into the section material of 35-50mm, dedusting;

(2) the section material after dedusting is sent in boiling vessel, with section material weighing scale, add the anthraquinone of NaOH and 0.4-0.6% of 3-5%, under steam pressure is 0.3-0.4MPa, processes 3-4 hour;

(3) section material is after step (2) process, sends into press master, twin-screw thread rolling machine and fiberizer successively, is slightly starched;

(4) the thick slurry that obtains of step (3) is after hydrabrusher disappears and dives, and namely obtains paper mulberry true qualities semichemical mechanical pulping.