CN103469696A

CN103469696A - Kraft paper and making method thereof

Info

Publication number: CN103469696A
Application number: CN2013104415076A
Authority: CN
Inventors: 陈海波; 梁明华
Original assignee: JURONG PLANT PROTECTION STATION
Current assignee: JURONG PLANT PROTECTION STATION
Priority date: 2013-09-26
Filing date: 2013-09-26
Publication date: 2013-12-25
Anticipated expiration: 2033-09-26
Also published as: CN103469696B

Abstract

The invention discloses a making method of kraft paper. The making method comprises the following steps: 1) pre-treating wood fibers; 2) adding sodium hydroxide and sodium sulfide in residual black liquor from the step 1) and performing secondary digestion to obtain a pulp material; 3) bleaching the pulp material obtained from the step 2); 4) adding a sizing material, a dye and a paper making retention and drainage agent, and performing reinforced evolution screening to remove impurities; and 5) mixing pulp with America waste paper and making the mixed pulp into paper in a paper making machine. The adopted bleaching technology allows paper whiteness to meet paper requirements, but does not reduce the mechanical strength of paper, and meanwhile the paper is not yellowed easily and is stable in quality. A Sirain paper making retention and drainage agent with high branch chain density adopted in the method has a flocculation capability more powerful than that of linear molecules and especially has an extremely strong retention capability for fine fibers. High strong positive charge density is also helpful to retain more filler. The method is simple in preparation technology and easy to operate and for industrial production.

Description

A kind of brown paper and manufacture method thereof

Technical field

The present invention relates to the manufacture field of pulping and paper-making, be specifically related to a kind of brown paper and manufacture method thereof.

Background technology

Brown paper (kraftpaper), as packaging material.Intensity is very high.Usually be yellowish-brown.It is filbert, cream-colored or white that the kraft pulp that partly floats or entirely float is.Quantitative 80～120g/m ².Fracture length is generally more than 6000m.Tearing toughness, the merit of breaking and resistance to vibration are very high.Mostly be roll web, sheet paper is also arranged.The employing kp softwood pulp is raw material, through making beating, on fourdrinier machine, manufactures paper with pulp and forms.Can be used as cement bag paper, M.G. pure sulphite paper, rubber seal paper dress, bituminized paper, cable protective paper, insulating paper etc.

The hardness of common brown paper is firm not, in addition in the preparation technology of brown paper, in order to obtain whiteness preferably, and reduced the mechanical strength of paper, simultaneously owing to easily occurring in pulping process that sediment causes slurries unstable evenly, thereby cause paper quality poor, therefore in preparing the process of brown paper, have variety of problems.

Summary of the invention

Goal of the invention: the purpose of this invention is to provide a kind of brown paper and preparation method thereof.

Technical scheme: in order solving the problems of the technologies described above, to the invention provides a kind of manufacture method of brown paper, to comprise the following steps:

1) preliminary treatment of lumber fibre;

2) make slurry by adding NaOH and vulcanized sodium to carry out boiling for the second time in black liquor residual in step 1);

3) by step 2) slurry that makes bleached;

4) add sizing material, dyestuff, paper retention and filter aid and strengthen the screening of evolving, removing impurity;

5) paper pulp being mixed to U.S.A gives up copy into paper in paper machine.

Preferably, the preliminary treatment of described lumber fibre comprises the following steps: the lumber fibre dry process is placed in the dipping screw machine, in screw machine, add akali sulphide or caustic soda to obtain maceration extract, in described maceration extract, the content of alkali is 40g/l, in proceeding to rotary spherical digester rotate 30 minutes in the dipping screw machine after, 100 ℃ ~ 120 ℃ boilings 50 minutes, the rotating speed of rotary spherical digester was 8 rev/mins.

Preferably, described lumber fibre is acerose fiber.

Preferably, described NaOH accounts for 10% of black liquor, and described vulcanized sodium accounts for 15% of black liquor.

Preferably, described bleaching process is: bleaching agent is clorox, starches densely 4.5%, and temperature is 42 ℃, and bleaching time is 4 hours, and whiteness is 45%.

Preferably, described paper retention and filter aid is the high chain density paper retention and filter aid of Sirain.

Preferably, described U.S.A gives up as the useless 1# of U.S. and U.S. useless 12#.

Brown paper prepared by described manufacture method.

Beneficial effect: the present invention has the following advantages:

1) bleaching process that the present invention adopts not only makes Paper White Degree reach the requirement of paper, and does not reduce the mechanical strength of paper, and paper is difficult for anti-Huang, steady quality simultaneously.

2) the present invention has adopted the high chain density paper retention and filter aid of Sirain, and this retention and drainage aid agent has the flocculation ability stronger than linear molecule, especially fiber fines is had to the extremely strong ability of stationing.High-strength positive electricity density, also can help to station more filler.

3) the method preparation technology is simple, easy operating, easily suitability for industrialized production.

the specific embodiment:

Embodiment 1:

A kind of manufacture method of brown paper comprises the following steps:

1) preliminary treatment of lumber fibre;

3) by step 2) slurry that makes bleached;

5) paper pulp being mixed to U.S.A gives up copy into paper in paper machine.

The preliminary treatment of described lumber fibre comprises the following steps: the lumber fibre dry process is placed in the dipping screw machine, in screw machine, add akali sulphide or caustic soda to obtain maceration extract, in described maceration extract, the content of alkali is 40g/l, in proceeding to rotary spherical digester rotate 30 minutes in the dipping screw machine after, 100 ℃ of boilings 50 minutes, the rotating speed of rotary spherical digester was 8 rev/mins.

Described lumber fibre is acerose fiber.

Described NaOH accounts for 10% of black liquor, and described vulcanized sodium accounts for 15% of black liquor.

Described bleaching process is: bleaching agent is clorox, starches densely 4.5%, and temperature is 42 ℃, and bleaching time is 4 hours, and whiteness is 45%.

Described paper retention and filter aid is the high chain density paper retention and filter aid of Sirain.

Described U.S.A gives up as the useless 1# of U.S..

Embodiment 2

A kind of manufacture method of brown paper comprises the following steps:

1) preliminary treatment of lumber fibre;

3) by step 2) slurry that makes bleached;

5) paper pulp being mixed to U.S.A gives up copy into paper in paper machine.

The preliminary treatment of described lumber fibre comprises the following steps: the lumber fibre dry process is placed in the dipping screw machine, in screw machine, add akali sulphide or caustic soda to obtain maceration extract, in described maceration extract, the content of alkali is 40g/l, in proceeding to rotary spherical digester rotate 30 minutes in the dipping screw machine after, 120 ℃ of boilings 50 minutes, the rotating speed of rotary spherical digester was 8 rev/mins.

Described lumber fibre is acerose fiber.

Described U.S.A gives up as the useless 12# of U.S..

Claims

1. the manufacture method of a brown paper, is characterized in that, comprises the following steps:

1) preliminary treatment of lumber fibre;

3) by step 2) slurry that makes bleached;

3) add sizing material, dyestuff, paper retention and filter aid and strengthen the screening of evolving, removing impurity;

5) paper pulp being mixed to U.S.A gives up copy into paper in paper machine.

2. the manufacture method of a kind of brown paper according to claim 1, it is characterized in that, the preliminary treatment of described lumber fibre comprises the following steps: the lumber fibre dry process is placed in the dipping screw machine, in screw machine, add akali sulphide or caustic soda to obtain maceration extract, in described maceration extract, the content of alkali is 40g/l, in proceeding to rotary spherical digester rotate 30 minutes in the dipping screw machine after, 100 ℃ ~ 120 ℃ boilings 50 minutes, the rotating speed of rotary spherical digester was 8 rev/mins.

3. the manufacture method of a kind of brown paper according to claim 1 and 2, is characterized in that, described lumber fibre is acerose fiber.

4. the manufacture method of a kind of brown paper according to claim 1 and 2, is characterized in that, described NaOH accounts for 10% of black liquor, and described vulcanized sodium accounts for 15% of black liquor.

5. the manufacture method of a kind of brown paper according to claim 1 and 2, is characterized in that, described bleaching process is: bleaching agent is clorox, starches densely 4.5%, and temperature is 42 ℃, and bleaching time is 4 hours, and whiteness is 45%.

6. the manufacture method of a kind of brown paper according to claim 1 and 2, is characterized in that, described paper retention and filter aid is the high chain density paper retention and filter aid of Sirain.

7. the manufacture method of a kind of brown paper according to claim 1 and 2, is characterized in that, described U.S.A gives up as the useless 1# of U.S. and U.S. useless 12#.

8. the brown paper that prepared by the described manufacture method of claim 1 or 2.