Improved easily-dyed polyurethane spinning solution filter screen

Abstract

An improved easily-dyed polyurethane spinning solution filter screen comprises a frame and a filter screen layer fixed on the inner wall of the frame, and the filter screen layer is formed by overlapping a plurality of filter screens with different pore diameters; the filter screen is of a folding structure, the surface area of the filter screen can be increased under the condition that the size of the frame is not changed, the flow direction of the spinning solution is changed, and the turbulence degree is increased. Due to the fact that a plane filter screen is improved to be the accordion box-shaped filter screen, the surface area of the filter screen can be increased under the condition that the size of the frame is not changed, the filter residue capacity is increased, the replacement period is prolonged, meanwhile, the flow direction of spinning stock solution needs to be changed when the spinning stock solution passes through the filter screen, the turbulence degree is increased, and the uniformity of the spinning stock solution can be further guaranteed. The spinning evenness is facilitated, and then the product quality is improved. Compared with the prior art, the production cost of the filter screen is only increased by 0.5%, and earnings brought by reduced waste quantity, downtime and liquid supply energy consumption are far higher, so that the filter screen is high in economical efficiency and easy to popularize and apply in the industry.

Description

TECHNICAL FIELD

[0001] The utility model belongs to spandex spinning technical field, specifically point to an improved easy dyeing polyurethane spinning solution filter screen. BACKGROUND

[0002] In the spandex spinning dry process production process, the spinneret belongs to the precision equipment, and the aperture of the spinneret hole is usually 400mu m, so the filter screen is arranged in the spinneret to filter the spinning solution. The existing filter screen is a filter screen stack with multiple layers of decreasing aperture, and the edge is fixed with an aluminum frame in a plane structure. The disadvantage is that the filtering area is small, which shortens the replacement cycle of the filter screen, and the filter screen often needs to be replaced every 12 days. Since the spandex spinning is continuous production, stopping to replace the filter screen will generate a lot of waste. At the same time, the small filtering area makes the liquid supply pressure large, generally 60kg, which increases the energy consumption and the equipment load, affecting the service life and maintenance cycle. SUMMARY

[0003] The technical problem to be solved by the utility model is to design an improved easy dyeing polyurethane spinning solution filter screen, which can prolong the replacement cycle of the filter screen and reduce the liquid supply pressure and equipment load.

[0004] The utility model is implemented as follows:

[0005] An improved easy dyeing polyurethane spinning solution filter screen, comprising: a frame and a filter screen layer fixed to the inner wall of the frame, wherein the filter screen layer comprises a plurality of filter screens with different apertures stacked together.

[0006] The filter screen has a folding structure, which can increase the surface area of the filter screen and change the flow direction of the spinning solution and increase the turbulence degree under the condition that the size of the frame remains unchanged.

[0007] Further, the filter screen has an accordion box shape.

[0008] Further, the folding angle of the filter screen is 25-40°.

[0009] Further, the folding angle of the filter screen is wavy.

[0010] Further, the fixed part of the filter screen and the inner wall of the frame is a plane structure.

[0011] Further, the filter screen has a water ripple shape structure, and the water ripple shape structure is 360° symmetrical, so that the stress on the edge of the filter screen is relatively uniform.

[0012] Further, the number of filter screens is 4, and the apertures of the 4 filter screens decrease in turn along the liquid supply direction.

[0013] Further, the thickness of the frame is 3mm, and the thickness of the filter screen layer is 5-7mm.

[0014] Further, the material of the frame is aluminum, and the material of the filter screen is stainless steel.

[0015] The utility model has the advantages that:

[0016] Since the flat filter screen is improved into the accordion case-shaped filter screen, the filter screen surface area can be increased without changing the size of the frame, the filter residue capacity is increased, the replacement period is prolonged, the flow direction of the spinning dope needs to be changed when the spinning dope passes through the filter screen, the turbulence degree is increased, the uniformity of the spinning dope can be further ensured, the spinning strip is dry, and the product quality is improved;

[0017] Since the wave-shaped corner is adopted, the transition of the corner is smoother, the risk of damage of the corner due to friction and collision during the manufacturing, assembly, transportation, storage and use of the filter screen is smaller, and the safety of production can be further improved;

[0018] Since the filter screen adopts the water wave shape design and is 360 degrees symmetrical, the stress on the edge of the filter screen is relatively uniform, and therefore, the edge of the filter screen is less likely to be warped due to uneven stress within the replacement period, and the risk of clogging of the spinneret hole due to the unfiltered spinning dope caused by the warped edge of the filter screen is avoided;

[0019] Since the production cost of the filter screen is only increased by 0.5% compared with that before the improvement, and the benefits brought by the reduced waste amount, downtime and liquid supply energy consumption are much higher than that, the economy is high, and the application in the industry is easy. BRIEF DESCRIPTION OF DRAWINGS

[0020] The utility model will be further described below with reference to the drawings and in combination with the embodiments.

[0021] Figure 1 is a top view of the existing filter screen.

[0022] Figure 2 is an exploded structural schematic view of the existing filter screen.

[0023] Figure 3 is a schematic view of the accordion case-shaped filter screen of the first embodiment of the utility model.

[0024] Figure 4 is a top view of the first embodiment of the utility model.

[0025] Figure 5 is the A-A cross-sectional view of the first embodiment of the utility model.

[0026] Figure 6 is the B-B cross-sectional view of the first embodiment of the utility model.

[0027] Figure 7is a wave angle accordion piano box-shaped filter net schematic diagram of the second embodiment of the utility model.

[0028] Figure 8 is a whole structure schematic diagram of the third embodiment of the utility model.

[0029] Figure 9 is a C-C cross section view of the third embodiment of the utility model.

[0030] Reference signs:

[0031] 1-frame, 2-flat filter net, 21-first filter net, 22-second filter net, 23-third filter net, 24-fourth filter net, 3-accordion piano box-shaped filter net, 4-wave angle accordion piano box-shaped filter net, 5-water ripple-shaped filter net. Specific implementation

[0032] The embodiments of the utility model are specifically explained below. Figures 1 to 9

[0033] As Figure 1 With Figure 2 As shown in the prior spin dope filter net is formed by the superposition of multiple flat filter nets 2, the edge of the filter net layer is fixed in the inner wall of the frame 1, the flat filter net 2 is made of stainless steel, and the frame 1 is made of aluminum. The flat filter net 2 includes a first filter net 21, a second filter net 22, a third filter net 23 and a fourth filter net 24, and the filter aperture decreases in turn. The filtering area of the flat filter net 2 is the area of the circular filter net, and the filtering area is very limited. The thickness of the frame 1 of the prior spin dope filter net is 3mm, and the total thickness of the filter net layer after the superposition of the filter net is 1mm. The frame is high and the filter net layer is low.

[0034] Example one

[0035] As Figures 3 to 6 ​As shown, the improvement made in this utility model is that the filter screen is made into an accordion box shape. It still uses multiple layers of filter screens stacked together to form a filter layer. This design allows the filter screen to increase its surface area while maintaining the same frame size 1, thereby increasing the filter cake capacity and extending the replacement cycle. The preferred filter screen angle is 25-40°. The part of the accordion box-shaped filter screen 3 fixed to the inner wall of the frame 1 has a planar structure. The thickness of the frame 1 remains 3mm, and the thickness of the filter layer is 5-7mm, with the frame lower and the filter layer higher. Since existing spinning solution filters require rubber rings to be installed at the front and back of the frame 1 for sealing during use, the actual edge thickness is the frame thickness plus the thickness of two rubber rings, which is greater than the 7mm filter layer thickness. Therefore, there is sufficient height margin to install the improved spinning solution filter screen without modifying the existing equipment. At the same time, the design of the accordion box-shaped filter screen 3 requires the spinning solution to change its flow direction when passing through the filter screen, increasing the turbulence and further ensuring the uniformity of the spinning solution, which is beneficial for spinning evenness and thus improving product quality.

[0036] The accordion-shaped filter screen 3 is manufactured using stamping or sintering processes and processed through molds. After a single filter screen is manufactured, multiple filter screens are assembled and fixed using a frame 1. With future technological upgrades, it may be possible to manufacture a single-piece filter screen with decreasing pore size, eliminating the need to assemble multiple filter screens. Because spinnerets are precision equipment, the 400μm pore size spinneret orifices are extremely prone to clogging. Even after cleaning, the filter screen cannot meet the high precision requirements, which will negatively affect the spinning evenness. Furthermore, the manufacturing cost of the filter screen is relatively low, so the filter screen is generally not considered for reuse.

[0037] The improved filter replacement cycle has been extended from 12 days to 30 days, and the liquid supply pressure has been reduced from 60 kg to 30 kg, significantly reducing the amount of waste generated during filter replacement and the energy consumption of the liquid supply pump. Compared with existing filters, although the increased filtration area leads to an increase in the amount of stainless steel used per filter and requires additional molds, the manufacturing cost per filter after mass production only increases by 0.5% compared to existing filters. The benefits from reduced waste, downtime, and liquid supply energy consumption far outweigh the increased manufacturing cost of the filter, making it highly economical and easy to promote and apply in the industry.

[0038] Example 2

[0039] like Figure 7 As shown, the corners of the accordion box-shaped filter 3 can also be designed as wavy. Compared with the accordion box-shaped filter 3 in Example 1, the transition of the corners of the wavy-cornered accordion box-shaped filter 4 is smoother. During the manufacturing, assembly, transportation, storage and use of the filter, the risk of damage to the corners due to friction and collision is smaller, which can further improve the safety of production.

[0040] Example 3

[0041] As shown in Figure 8 and Figure 9 on the basis of example two, the filter screen can also be designed into a concentric water ripple shape, because the water ripple shape filter screen 5 is 360 degrees symmetrical, the stress on the edge of the filter screen is relatively uniform, so it is less likely to have edge warping due to uneven stress within the replacement cycle, avoiding the risk of clogging the spinneret due to the unfiltered part of the spinning dope on the edge of the filter screen.

[0042] The utility model discloses since the plane filter screen is improved into the accordion case shape filter screen, so can increase the filter screen surface area under the condition that the size of the frame is not changed, and further increase the filter residue capacity, prolong the replacement cycle, and the spinning dope needs to change the flow direction when passing through the filter screen, increase the turbulence degree, can further guarantee the uniformity of the spinning dope, is beneficial to the spinning strip dry, and then improves product quality.

[0043] Due to the adoption of the wave-shaped corner, the transition of the corner is more smooth, and in the manufacturing, assembling, transporting, storing and using process of the filter screen, the risk of damage at the corner due to friction and collision is smaller, and the safety of production can be further improved.

[0044] Due to the adoption of the water ripple shape design of the filter screen, the water ripple shape is 360 degrees symmetrical, so the stress on the edge of the filter screen is relatively uniform, so it is less likely to have edge warping due to uneven stress within the replacement cycle, avoiding the risk of clogging the spinneret due to the unfiltered part of the spinning dope on the edge of the filter screen.

[0045] Due to the fact that the production cost of the filter screen only increases by 0.5% compared with before the improvement, and the benefits brought by the reduced amount of waste, downtime and liquid supply energy consumption are much higher than this, the economy is high, and it is easy to popularize and apply in the industry.

[0046] The above examples and drawings are not limited to the product shape and style of the utility model, and any ordinary skilled person in the art can make appropriate changes or modifications, which should be considered as not departing from the patent scope of the utility model.

Claims

1. An improved easy dyeable polyurethane spinning dope filter screen, characterized by: The frame and the filter screen layer fixed on the inner wall of the frame, the filter screen layer comprises a plurality of filter screens with different pore sizes superimposed on each other. The filter screen is a folding structure, which can increase the surface area of the filter screen, change the flow direction of the spinning dope, and increase the degree of turbulence without changing the size of the frame. The filter screen is an accordion box-shaped structure.

2. An improved easy-to-dye polyurethane spinning dope filter screen as claimed in claim 1, wherein: The folding angle of the filter screen is 25-40°.

3. An improved easy-to-dye polyurethane spinning dope filter screen as claimed in claim 2, characterized in that: The folding angle of the filter screen is wavy.

4. An improved easy-to-dye polyurethane spinning dope filter screen as claimed in claim 2, wherein: The 5. An improved easy-to-dye polyurethane spinning dope filter screen as claimed in claim 4, characterized in that: The fixed part of the filter screen and the inner wall of the frame is a flat structure. The filter screen is a water ripple shape structure, which is 360° symmetrical, and the stress on the edge of the filter screen is relatively uniform.

6. An improved easy-to-dye polyurethane spinning dope filter screen as claimed in claim 1, wherein: The number of filter screens is 4, and the pore sizes of the 4 filter screens decrease in turn along the liquid supply direction.

7. An improved easy-to-dye polyurethane spinning dope filter screen as claimed in claim 4, wherein: The thickness of the frame is 3mm, and the thickness of the filter screen layer is 5-7mm.

8. An improved easy-to-dye polyurethane spinning dope filter screen as claimed in claim 7, characterized in that: The material of the frame is aluminum, and the material of the filter screen is stainless steel.

9. An improved easy-to-dye polyurethane spinning dope filter screen as claimed in claim 1, wherein: ​

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