This standard specifies a method for pulp disintegration using a fiber standard disintegrator. However, this standard cannot be used as a preliminary disintegration for laboratory Valley pulping. This standard applies to most pulps. This standard does not apply to uncut cotton pulp, flax and similar pulps. QB/T 1462-1992 Wet disintegration of pulp in the laboratory QB/T1462-1992 Standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
Wet dissociation of pulp in laboratory
This standard is equivalent to ISO5263-1979 "Wet dissociation of pulp in laboratory". Subject content and scope of application
QB/T1462-1992
Replaces QB/T1462-1979
This standard specifies a method for dissociating pulp using a fiber standard dissociator. However, this standard cannot be used as a preliminary dissociation for laboratory valley pulping.
This standard is applicable to most pulps.
This standard is not applicable to uncut cotton pulp, flax and similar pulps. 2 Reference standardsbzxZ.net
GB/T741 Determination of moisture content in chemical pulp analysis samples GB/T5399 Rapid method for determination of pulp concentration 3 Principle
Pulp of specified concentration is mechanically treated in a disintegrator to separate the interlaced fibers in the pulp, and the structural properties of the disintegrated pulp fibers will not change significantly.
Instruments and water quality
4.1 Common laboratory instruments.
4.2 Disintegrator: See Appendix A.
4.3 Balance: Sensitivity 0.1g.
4.4 Distilled water, deionized water or water of similar quality. 5 Preparation of samples
If the sample is wet pulp or air-dried pulp, its moisture content shall be determined according to GB/T741. If the sample is liquid pulp, its absolute dry matter content shall be determined according to GB/T5399.
Take a certain amount of pulp as specified in the table below. Do not cut the pulp or use the edge of the pulp board. Pulp with a dryness of 20% or more (m/m) is soaked in 1L or 1.5L of water. The soaking time is shown in the table below. If the pulp is in sheets or blocks, tear the soaked pulp into small pieces of about 25mm×25mm. Pulp type
Chemical pulp
Flash drying chemical pulp
Mechanical pulp
Flash drying mechanical pulp
Absolute pulp quantity,
Approved by the Ministry of Light Industry of the People's Republic of China on 1992-04-14 Soaking time, h
Dissociation volume, mL
30 000
1992-12-01 Implementation
6 Steps
QB/T 1462--1992
6.1 Transfer the wet pulp sample and the water used for soaking into the dissociator and add (20±5)℃ water to make the total volume reach the corresponding provisions in the above table. Adjust the counter to zero, start the motor, let the dissociator run for a few seconds, turn off the motor, and before the spiral stirrer (hereinafter referred to as the stirrer) stops, start the motor again to make the stirrer reach the number of revolutions specified in the table. Stop the agitator and check whether the pulp has been completely dissociated. If not, you can continue to dissociate, but the actual non-standard dissociation speed should be reported. 6.2 After dissociation, the dissociator should be thoroughly cleaned with water and, if necessary, with a solvent that can remove resin. Test report
The test report includes the following items:
This standard number;
Relevant marks for identifying the sample,
Immersion time;
Pulp concentration and the number of revolutions used for dissociation.
A1 Materials
QB/T1462--1992
Appendix A
Structure of dissociator
(Supplement)
All components in contact with the pulp suspension must be waterproof, resistant to dilute acids and alkalis. A2 Dissociator
The cylindrical container is equipped with four spiral baffles that rotate clockwise downward at equal distances, and each baffle occupies half a circle of the container. The distance from the lower end of the baffle to the bottom of the container is 32 mm, the upper end of the baffle is 57 mm from the edge of the container, and the bottom of the container has an inner fillet with a radius of 13 mm.
The spiral agitator is installed on the central vertical axis in the container, at a fixed distance from the bottom. The spiral agitator rotates at a specified speed in the slurry and is equipped with a counter that can record the speed and revolutions. The counter is preferably pre-positioned. When the revolutions reach the required number, the disintegrator stops running. The agitator rotates in a clockwise direction. When the disintegrator is running, the container is tightly fixed in its position, but it is easy to put and take. The structural dimensions of the disintegrator are shown in Table A1.
Inner height
Agitator
Agitator blade
Agitator shaft
Inner diameter
Radius of rounded corners
Square section
Height from bottom of container to baffle
Distance from top of container to baffle
Radius of baffle end
Edge radius
Distance between two baffles
Hub diameter
Distance between each blade and container bottom
Hub width
Maximum width
Edge radius
Radius of blade end
Conical end
Dimensions, mm
Can be matched with any agitator hub
Allowable error, mm||tt| |Meet the requirements of the gauge
Meet the requirements of the gauge
Meet the requirements of the gauge
(minimum value)
Meet the requirements of the gauge
Meet the requirements of the gauge
Rotation frequency
QB/T1462-1992
The rotation frequency of the agitator is (48.3±1.65)s-1Appendix B
Inspection of the disintegrator
(reference)
B1The disintegrator should be inspected regularly, and special attention should be paid to ensure: a.
The agitator shaft should be able to rotate smoothly and always in the center of the container; the agitator should operate at the specified rotation frequency; the agitator blade should be installed as required (can be checked with a stirrer caliper); the specifications of the agitator blade should be in accordance with the regulations.
If the instrument is used normally, the other dimensions of the disintegrator should remain constant and should be checked regularly. Additional Notes:
This standard was proposed by the Paper Industry Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Paper Standard Promotion Center. This standard was drafted by the Shanghai Paper Research Institute. The main drafter of this standard is Sun Xiuyi.
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