System for improving whiteness of lyocell fiber product

Abstract

The utility model provides a system for improving the whiteness of lyocell fiber products. A high-temperature water cleaning device is arranged between a washing machine and a cut-off machine. The high-temperature water cleaning device is arranged between the washing machine and the cut-off machine, tows can be cleaned in high-temperature water, and then the whiteness of lyocell fiber products can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of textile, and particularly relates to a system for improving the whiteness of Lyocell fiber products. Background Art

[0002] In the production process of Lyocell fiber, due to the difference in pulp raw materials, there are significant differences in the whiteness of the products. Currently, for Lenzing products on the market, due to the use of American Cosma pulp, the whiteness of their products is above 80%, while for Brazilian pulp, the whiteness of their products is 77%-79%. However, during the startup process, due to the long residence time of the sizing solution, the decomposition of chemicals such as NMMO / PG causes an increase in the chromaticity of the sizing solution, resulting in a further reduction in the whiteness of the products to 70%-76%. Such products can only be sold separately.

[0003] Therefore, how to improve the whiteness of Lyocell fiber products has become a problem to be solved. Summary of the Utility Model

[0004] In view of this, the technical problem to be solved by the utility model is to provide a system for improving the whiteness of Lyocell fiber products, and the system provided by the utility model can improve the whiteness of Lyocell fiber products.

[0005] The utility model provides a system for improving the whiteness of Lyocell fiber products, and a water cleaning device is arranged between the water washing machine and the cutting machine.

[0006] Preferably, it includes a spinning device, a winding device, a water washing machine, a water cleaning device, a cutting machine, and a refining machine that are connected in sequence.

[0007] Preferably, the water cleaning device includes a water cleaning tank and a heating device arranged on the outer periphery and / or inside of the water cleaning tank.

[0008] Preferably, the water cleaning device includes a water cleaning tank, and the water cleaning tank is provided with a water inlet.

[0009] Preferably, a water supply device is connected to the water inlet.

[0010] Preferably, the water cleaning device includes:

[0011] A water cleaning tank;

[0012] A steam heating pipeline arranged at the bottom of the water cleaning tank, and the steam heating pipeline includes a steam inlet and a steam outlet;

[0013] A hot water inlet and a hot water outlet arranged on the side wall of the water cleaning tank, the hot water inlet and the hot water outlet are connected by a hot water pipeline, and a hot water makeup inlet is provided on the hot water pipeline.

[0014] Preferably, a thermometer is provided in the water washing tank.

[0015] Preferably, a steam inlet pipe is connected to the steam inlet, and a steam valve and a steam flow meter are provided on the steam inlet pipe;

[0016] A steam outlet pipe is provided at the steam outlet.

[0017] Preferably, the spinning device includes a spinning machine platform and a spinning bath connected to the spinning machine platform, and the spinning bath is connected to the winding device.

[0018] Preferably, the water washing machine includes a plurality of independent water washing units.

[0019] Compared with the prior art, the present invention provides a system for improving the whiteness of Lyocell fiber products, and a water cleaning device is provided between the water washing machine and the cutting machine. By providing a water cleaning device between the water washing machine and the cutting machine, the present invention can clean the tow in water, thereby improving the whiteness of Lyocell fiber products. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the system for improving the whiteness of Lyocell fiber products provided by the present invention;

[0021] Figure 2 is a schematic structural diagram of the water cleaning device provided by the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] The present invention provides a system for improving the whiteness of Lyocell fiber products, and a water cleaning device is provided between the water washing machine and the cutting machine.

[0023] In some specific embodiments of the present invention, the system includes a spinning device, a winding device, a water washing machine, a water cleaning device, a cutting machine, and a refining machine that are connected in sequence.

[0024] See Figure 1 , Figure 1 is a schematic structural diagram of the system for improving the whiteness of Lyocell fiber products provided by the present invention.

[0025] Specifically, the system provided by the present invention includes a spinning device, wherein the spinning device is used for spinning Lyocell spinning sizing solution to obtain a tow. Among them, the spinning device includes a spinning machine platform and a spinning bath connected to the spinning machine platform, and the spinning bath is connected to the winding device.

[0026] The system provided by the present invention further includes a winding device connected to the spinning device, and the winding device is used for stretching the tow.

[0027] The system provided by the present utility model further includes a water washing machine connected to the winding device, and the water washing machine is used to wash the tow. In some specific embodiments of the present utility model, the water washing machine includes a plurality of independent water washing units.

[0028] The system provided by the present utility model further includes a water cleaning device connected to the water washing machine.

[0029] In some specific embodiments of the present utility model, the water cleaning device includes a water cleaning tank and a heating device disposed on the outer periphery or inside of the water cleaning tank.

[0030] In some specific embodiments of the present utility model, the water cleaning device includes a water cleaning tank, and the water cleaning tank is provided with a hot water inlet. Preferably, a water supply device is connected to the hot water inlet.

[0031] In some specific embodiments of the present utility model, in order to ensure that the hot water temperature in the water cleaning tank is heated faster and more evenly, and further improve the whiteness of the product, that is, by laying a steam heating pipeline at the bottom of the water cleaning tank and simultaneously introducing hot water into the water cleaning tank. Refer to Figure 2 , Figure 2 is a schematic structural diagram of the water cleaning device provided by the present utility model. Specifically, the water cleaning device includes:

[0032] A water cleaning tank;

[0033] A steam heating pipeline disposed at the bottom of the water cleaning tank, and the steam heating pipeline includes a steam inlet and a steam outlet;

[0034] A hot water inlet and a hot water outlet disposed on the side wall of the water cleaning tank, the hot water inlet and the hot water outlet are connected by a hot water pipeline, and a hot water makeup inlet is opened on the hot water pipeline.

[0035] Among them, preferably, the steam heating pipeline can be disposed at the bottom of the water cleaning tank in a manner of being coiled by an S-shaped pipeline. A steam inlet pipe is connected to the steam inlet, and a steam valve and a steam flow meter are disposed on the steam inlet pipe; a steam outlet pipe is disposed at the steam outlet.

[0036] In order to ensure accurate control of the water temperature in the water cleaning tank, a thermometer is disposed in the water cleaning tank.

[0037] The system provided by the present utility model further includes a cutting machine connected to the water cleaning device, and the cutting machine is used to cut the tow to obtain short fibers.

[0038] The system provided by the present utility model further includes a refining machine connected to the cutting machine. The refining machine is one of the important unit devices in the post-treatment production line and is used to perform process operations such as water washing, bleaching, and oiling on the Lyocell staple fibers cut by the cutting machine, so that the fibers have a certain whiteness and good spinnability.

[0039] The present utility model also provides a method for improving the whiteness of Lyocell fiber products, including the following steps:

[0040] The spinning dope is successively subjected to spinning, winding, water washing, water cleaning, cutting, and refining to obtain Lyocell fibers;

[0041] Among them, when the method satisfies the formula shown in Formula I, the whiteness of the product can be further improved;

[0042] P = T * A * a / M - B * 100 Formula I

[0043] In Formula I, M is the initial chromaticity of the spinning dope. The method for determining the initial chromaticity of the spinning dope is that 1 g of the dope is immersed in 50 g of water at a temperature of 80 °C for 24 h, and then the chromaticity M of the aqueous solution is detected. Its value range is 60 - 200, with the unit of %, and it can be 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, or any value between 60 and 200.

[0044] A is the temperature of water cleaning, and the value range is 30 - 50 °C, and it can be 30, 35, 40, 45, 50, or any value between 30 and 50 °C.

[0045] T is the residence time of water cleaning, and the value range is 2 - 10 min, and it can be 2, 3, 4, 5, 6, 7, 8, 9, 10, or any value between 2 and 10 min.

[0046] B is the ratio of fiber weight to water weight during water cleaning, that is, the ratio of fiber weight to water weight, and the value range is 1 / 10 - 1 / 50, and it can be 1 / 10, 1 / 15, 1 / 20, 1 / 25, 1 / 30, 1 / 35, 1 / 40, 1 / 45, 1 / 50, or any value between 1 / 10 and 1 / 50.

[0047] a is an empirical factor, a = N / 10, where N is the daily output, with the unit of t / day, and the value of a can be 10 - 20, and it can be 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or any value between 10 and 20.

[0048] After calculating, the P value needs to be ≥0 to further improve the whiteness of the product.

[0049] The utility model quantifies the process parameters of the water washing section, which can further improve the whiteness of the product.

[0050] The utility model is provided with a water cleaning device between the water washing machine and the cutting machine, which can clean the tow in water, thereby improving the whiteness of the Lyocell fiber product.

[0051] To further understand the utility model, the following describes the system for improving the whiteness of Lyocell fiber products provided by the utility model in conjunction with embodiments. The protection scope of the utility model is not limited by the following embodiments.

[0052] Embodiment 1

[0053] This embodiment provides a system for improving the whiteness of Lyocell fiber products, including a spinning device, a winding device, a water washing machine, a water cleaning device, a cutting machine, and a refining machine connected in sequence.

[0054] Among them, the spinning device includes a spinning machine platform and a spinning bath connected to the spinning machine platform, and the spinning bath is connected to the winding device.

[0055] The water washing machine includes 5 water washing units.

[0056] The water cleaning device includes a water cleaning pool and a heating device arranged on the outer periphery of the water cleaning pool.

[0057] Embodiment 2

[0058] This embodiment provides a system for improving the whiteness of Lyocell fiber products, including a spinning device, a winding device, a water washing machine, a water cleaning device, a cutting machine, and a refining machine connected in sequence.

[0059] Among them, the spinning device includes a spinning machine platform and a spinning bath connected to the spinning machine platform, and the spinning bath is connected to the winding device.

[0060] The water washing machine includes 5 water washing units.

[0061] The water cleaning device includes a water cleaning pool, and the water cleaning pool is provided with a hot water inlet. A hot water supply device is connected to the hot water inlet.

[0062] Embodiment 3

[0063] This embodiment provides a system for improving the whiteness of Lyocell fiber products, including a spinning device, a winding device, a water washing machine, a water cleaning device, a cutting machine, and a refining machine connected in sequence.

[0064] Among them, the spinning device includes a spinning machine platform and a spinning bath connected to the spinning machine platform, and the spinning bath is connected to the winding device.

[0065] The washing machine includes 5 washing units.

[0066] The water cleaning device includes:

[0067] A water cleaning tank;

[0068] A steam heating pipeline arranged at the bottom of the water cleaning tank, the steam heating pipeline includes a steam inlet and a steam outlet;

[0069] A hot water inlet and a hot water outlet arranged on the side wall of the water cleaning tank, the hot water inlet and the hot water outlet are connected by a hot water pipeline, and a hot water makeup inlet is opened on the hot water pipeline.

[0070] Among them, the steam heating pipeline can be arranged at the bottom of the water cleaning tank in a way of being coiled by an S-shaped pipeline. A steam inlet pipe is connected to the steam inlet, and a steam valve and a steam flowmeter are arranged on the steam inlet pipe; a steam outlet pipe is arranged at the steam outlet.

[0071] In order to ensure accurate control of the water temperature in the water cleaning tank, a thermometer is arranged in the water cleaning tank.

[0072] Example 4

[0073] The system for improving the whiteness of Lyocell fiber products provided in Example 3 is used for product preparation.

[0074] Specifically, for the Brazilian pulp, the cellulose content of the prepared sizing solution is 12.9%, and the daily output is 160t. The specific data are shown in the following table:

[0075] Among them, the preparation method needs to satisfy the formula shown in Formula I:

[0076] P = T * A * a / M - B * 100 Formula I

[0077] Among them, the values of T, A, a, M, and B are shown in Table 1.

[0078] M is the initial chromaticity of the spinning sizing solution, A is the temperature of water cleaning, T is the residence time, B is the ratio of gross water, a is an empirical factor, and the daily output is 160t. Therefore, a = 16.

[0079] Table 1

[0080]

[0081] Comparative Example 1

[0082] On the basis of the system provided in Example 1, the water cleaning device is removed, that is, the washing machine is directly connected to the cutting machine, and other devices and connection relationships remain unchanged.

[0083] The preparation process is the same as that of No. 7 in Example 4, except that the water washing step is not carried out, that is, it is directly cut after water washing, and the other steps are the same as those in Example 3.

[0084] The whiteness of the finally obtained product is 75%.

[0085] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A system for improving the whiteness of Lyocell fiber products, the system comprising a spinning device, a winding device, a water washing machine, a cutting machine and a refining machine connected in sequence, characterized in that, A water cleaning device is provided between the water washing machine and the cutting machine.

2. The system according to claim 1, wherein The water cleaning device includes a water cleaning tank and a heating device disposed on the outer periphery and / or inside of the water cleaning tank.

3. The system according to claim 1, characterized in that, The water cleaning device includes a water cleaning tank, and the water cleaning tank is provided with a hot water inlet.

4. The system according to claim 3, wherein A hot water supply device is connected to the hot water inlet.

5. The system according to claim 1, wherein The water cleaning device includes: A water cleaning tank; A steam heating pipeline disposed at the bottom of the water cleaning tank, the steam heating pipeline including a steam inlet and a steam outlet; A hot water inlet and a hot water outlet disposed on the side wall of the water cleaning tank, the hot water inlet and the hot water outlet being connected by a hot water pipeline, and a hot water make-up inlet being opened on the hot water pipeline.

6. The system according to claim 5, wherein A thermometer is disposed inside the water cleaning tank.

7. The system according to claim 5, wherein A steam inlet pipe is connected to the steam inlet, and a steam valve and a steam flow meter are disposed on the steam inlet pipe; A steam outlet pipe is disposed at the steam outlet.

8. The system according to claim 1, wherein The spinning device includes a spinning machine platform and a spinning bath connected to the spinning machine platform, and the spinning bath is connected to the winding device.

9. The system according to claim 1, characterized in that The water washing machine includes a plurality of independent water washing units.

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