Process for crushing pulp dregs in production of viscose fibers

Abstract

The invention relates to a process for crushing pulp dregs in the production of viscose fibers. The process comprises the following steps of: obtaining re-crushed pulp dregs with the crushing degree of 130-200 g / L by pre-crushing, finely crushing at a high speed and finely re-crushing; and delivering the re-crushed pulp dregs to an aging working procedure. According to the process, the pulp dregs is crushed by adopting a process which combines the pre-crushing with fine re-crushing, when the yield is increased, the crushing degree can be ensured not to be lowered, and even, the phenomenon of vitrification in the pulp dregs can be ensured not to occur due to intense high-speed crushing at the same time of increasing the crushing degree, so that the condition that the vitrified pulp dregs do not etiolate with CS2, the cellulose sulfonate cannot be produced, and the quality of products are affected, is prevented.

Description

technical field

[0001] The invention relates to a production process in viscose fiber, more specifically, the invention relates to a pulp crushing process in viscose fiber production. Background technique

[0002] The production of viscose fiber is that the pulp reacts with alkali, and then squeezes out the excess alkali liquor through a press, and then crushes the pressed pulp through a pulverizer, and then puts it into a yellowing machine to neutralize CS. 2 React to produce cellulose sulfonate, and then dissolve cellulose sulfonate in dilute lye in the post-dissolving machine to make viscose fiber spinning stock solution.

[0003] The purpose of pulverizing pulp is mainly to increase the specific surface area of ​​pulp, so that the reaction in the yellowing machine can be more uniform, the reaction quality can be improved, and the product quality can be improved.

[0004] The existing pulverizers can pulverize the pulp to 200-220g / L. Due to the increase in output, there ...

Examples

Embodiment 1

[0019] A kind of pulp crushing process in viscose fiber production, it is characterized in that: comprise following process step:

[0020] A. Pre-crushing: crushing the pulp after the pressing process at a low speed;

[0021] B. High-speed fine crushing: transport the pre-crushed pulp to a high-speed fine grinder for high-speed fine crushing, the speed of the grinder is 1150 rpm, and the crushing time is 0.05s;

[0022] C, secondary fine crushing: carry out secondary fine crushing through the high-speed finely crushed pulp, and obtain the secondary crushed pulp with a crushing degree of 130g / L, and send it to the aging process; the speed of the pulverizer is 2240 rpm, The crushing time is 0.01s.

[0023] The pulp obtained through high-speed fine grinding in step A of the present invention is pulp with a grinding degree of 200 g / L.

[0024] In the step A of the present invention, pulverizing the pulp that has passed through the pressing process at a low rotational speed refer...

Embodiment 2

[0026] A kind of pulp crushing process in viscose fiber production, it is characterized in that: comprise following process step:

[0027] A. Pre-crushing: crushing the pulp after the pressing process at a low speed;

[0028] B. High-speed fine crushing: transport the pre-crushed pulp to a high-speed fine grinder for high-speed fine crushing, the speed of the grinder is 1440 rpm, and the crushing time is 0.08s;

[0029] C, secondary fine crushing: carry out secondary fine crushing through the high-speed finely crushed pulp, and obtain the secondary crushed pulp with a crushing degree of 200g / L, which is sent to the aging process; the speed of the pulverizer is 2800 rpm, The crushing time is 0.05s.

[0030] The pulp obtained through high-speed fine grinding in step A of the present invention is pulp with a grinding degree of 220 g / L.

[0031] In the step A of the present invention, pulverizing the pulp that has passed through the pressing process at a low rotational speed ref...

Embodiment 3

[0033] A kind of pulp crushing process in viscose fiber production, it is characterized in that: comprise following process step:

[0034] A. Pre-crushing: crushing the pulp after the pressing process at a low speed;

[0035] B. High-speed fine crushing: transport the pre-crushed pulp to a high-speed fine grinder for high-speed fine crushing, the speed of the grinder is 1295 rpm, and the crushing time is 0.065s;

[0036] C, secondary fine crushing: carry out secondary fine crushing through the high-speed finely crushed pulp, and obtain the secondary crushed pulp with a crushing degree of 165g / L, and send it to the aging process; the speed of the pulverizer is 2520 rpm, The crushing time is 0.03s.

[0037] The pulp obtained through high-speed fine grinding in step A of the present invention is pulp with a grinding degree of 210 g / L.

[0038] In the step A of the present invention, pulverizing the pulp that has passed through the pressing process at a low rotational speed refe...

technical field

[0001] The invention relates to a production process in viscose fiber, more specifically, the invention relates to a pulp crushing process in viscose fiber production. Background technique

[0002] The production of viscose fiber is that the pulp reacts with alkali, and then squeezes out the excess alkali liquor through a press, and then crushes the pressed pulp through a pulverizer, and then puts it into a yellowing machine to neutralize CS. 2 React to produce cellulose sulfonate, and then dissolve cellulose sulfonate in dilute lye in the post-dissolving machine to make viscose fiber spinning stock solution.

[0003] The purpose of pulverizing pulp is mainly to increase the specific surface area of ​​pulp, so that the reaction in the yellowing machine can be more uniform, the reaction quality can be improved, and the product quality can be improved.

[0004] The existing pulverizers can pulverize the pulp to 200-220g / L. Due to the increase in output, there ...

Examples

Embodiment 1

[0019] A kind of pulp crushing process in viscose fiber production, it is characterized in that: comprise following process step:

[0020] A. Pre-crushing: crushing the pulp after the pressing process at a low speed;

[0021] B. High-speed fine crushing: transport the pre-crushed pulp to a high-speed fine grinder for high-speed fine crushing, the speed of the grinder is 1150 rpm, and the crushing time is 0.05s;

[0022] C, secondary fine crushing: carry out secondary fine crushing through the high-speed finely crushed pulp, and obtain the secondary crushed pulp with a crushing degree of 130g / L, and send it to the aging process; the speed of the pulverizer is 2240 rpm, The crushing time is 0.01s.

[0023] The pulp obtained through high-speed fine grinding in step A of the present invention is pulp with a grinding degree of 200 g / L.

[0024] In the step A of the present invention, pulverizing the pulp that has passed through the pressing process at a low rotational speed refer...

Embodiment 2

[0026] A kind of pulp crushing process in viscose fiber production, it is characterized in that: comprise following process step:

[0027] A. Pre-crushing: crushing the pulp after the pressing process at a low speed;

[0028] B. High-speed fine crushing: transport the pre-crushed pulp to a high-speed fine grinder for high-speed fine crushing, the speed of the grinder is 1440 rpm, and the crushing time is 0.08s;

[0029] C, secondary fine crushing: carry out secondary fine crushing through the high-speed finely crushed pulp, and obtain the secondary crushed pulp with a crushing degree of 200g / L, which is sent to the aging process; the speed of the pulverizer is 2800 rpm, The crushing time is 0.05s.

[0030] The pulp obtained through high-speed fine grinding in step A of the present invention is pulp with a grinding degree of 220 g / L.

[0031] In the step A of the present invention, pulverizing the pulp that has passed through the pressing process at a low rotational speed ref...

Embodiment 3

[0033] A kind of pulp crushing process in viscose fiber production, it is characterized in that: comprise following process step:

[0034] A. Pre-crushing: crushing the pulp after the pressing process at a low speed;

[0035] B. High-speed fine crushing: transport the pre-crushed pulp to a high-speed fine grinder for high-speed fine crushing, the speed of the grinder is 1295 rpm, and the crushing time is 0.065s;

[0036] C, secondary fine crushing: carry out secondary fine crushing through the high-speed finely crushed pulp, and obtain the secondary crushed pulp with a crushing degree of 165g / L, and send it to the aging process; the speed of the pulverizer is 2520 rpm, The crushing time is 0.03s.

[0037] The pulp obtained through high-speed fine grinding in step A of the present invention is pulp with a grinding degree of 210 g / L.

[0038] In the step A of the present invention, pulverizing the pulp that has passed through the pressing process at a low rotational speed refe...