Papermaking press blanket based on plain weaving and manufacturing process thereof
By introducing a two-component reinforced PA66 fiber of acyl chloride nanodiamond and tannin into the press blanket and combining it with a TPU elastomer layer, the problem of insufficient strength of the press blanket in high-speed papermaking machines was solved, achieving higher tensile and flexural strength and ensuring structural stability.
Patent Information
- Application Number
- CN202511134243.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-14
- Publication Date
- 2025-11-07
AI Technical Summary
Existing press blankets are not strong enough in the vacuum/grooved press zone of high-speed paper machines, and cannot effectively withstand extreme mechanical loads and dynamic impacts, resulting in yarn breakage and dewatering failure.
Paper press felt based on plain weave is used. By introducing acyl chloride nanodiamond and tannin as a dual-component synergistic reinforcement in PA66 fiber layer, and adding a 0.3 mm thick TPU elastomer layer in the middle layer, a structure of surface fiber layer, TPU elastomer layer and bottom fiber layer is formed.
It significantly improves the tensile and flexural strength of press blankets, enhances their structural stability under high pressure, avoids yarn breakage, and ensures the continuity and efficiency of the papermaking process.
Smart Images
Figure CN120902400A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of textiles, in particular to a plain weave based press felt for papermaking and a manufacturing process thereof. BACKGROUND
[0002] The plain weave press felt adopts a basic "one over one under" warp-weft interlacing structure, takes high-strength nylon monofilament as a framework to form a vertical pore channel, and significantly optimizes the water filtration property, especially adapts to the vacuum / groove press area demand of a high-speed papermaking machine. The core advantage lies in efficient water drainage and pressure resilience. The plain weave press felt has a very high strength requirement because it needs to withstand the extreme mechanical load and dynamic impact of the papermaking press area, and the press felt needs to maintain structural stability under high pressure to avoid dehydration failure or shutdown caused by yarn breakage. SUMMARY
[0003] To solve the problem of insufficient strength of the press felt in the prior art, the present application provides a plain weave based press felt for papermaking and a manufacturing process thereof
[0004] The present application is realized by the following technical solutions:
[0005] A plain weave based press felt for papermaking, from top to bottom, comprises a surface fiber layer, a TPU elastomer layer and a bottom fiber layer; the surface fiber layer and the bottom fiber layer are both formed by melt mixing and spinning of the following components: 96 parts by mass of PA66, 1-5 parts by mass of acyl chloride nano diamond, and 0.5 parts by mass of tannin.
[0006] Further, the amount of acyl chloride nano diamond is 4 parts by mass.
[0007] Further, the acyl chloride nano diamond is prepared by the following steps: step S1: dispersing 5 g of nano diamond with a particle size of 5-10 nm in 200 mL of SOCl2, and ultrasonicating for 30 min until no agglomerates are visible to the naked eye;
[0008] Step S2: under the conditions of nitrogen protection and continuous stirring, add 1 mL of DMF and react at 70°C for 24 h;
[0009] Step S3: after the reaction is completed, vacuum filter through a nylon membrane, and wash with 200 mL of tetrahydrofuran three times;
[0010] Step S4: vacuum dry at room temperature for 24 h to obtain acyl chloride nano diamond.
[0011] Further, the particle size of the nano diamond is 5-10 nm.
[0012] Further, the spinning process parameters of the surface fiber layer and the bottom fiber layer are as follows: spinning temperature 280°C, ambient temperature 30°C, relative humidity 65%, spinning speed 1500 m / min, and the obtained fiber length is 15 mm.
[0013] Further, the thickness of the TPU elastomer layer is 0.3 mm.
[0014] The application also provides a weaving process of a papermaking press felt based on plain weaving
[0015] The weaving process comprises the following steps:
[0016] Step S11: placing the TPU elastomer layer between the surface fiber layer and the bottom fiber layer, and performing heat treatment;
[0017] Step S12: temperature rising and curing; Step S13: soaking in deionized water at 25°C for 1 h;
[0018] Step S14: heat treatment at 120°C for 20 min, to obtain the press felt.
[0019] Further, the temperature of the heat treatment in step S11 is 85°C, and the time is 2 h.
[0020] Further, the curing temperature in step S12 is 140°C, and the time is 30 min.
[0021] Compared with the prior art, the application has the following advantages and beneficial effects:
[0022] The technical scheme of the application enhances the PA66 fiber through the synergistic effect of the acyl chloride nano diamond and tannin, and uses the 0.3 mm TPU elastomer layer as the core. The acyl chloride nano diamond and tannin are introduced into the PA66 matrix, and the effect is better than that of using one component alone, which proves that the synergistic interface engineering of the acyl chloride nano diamond and tannin can simultaneously improve the rigidity and toughness. BRIEF DESCRIPTION OF DRAWINGS
[0023] The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the embodiments of the application, and do not constitute a limitation of the embodiments of the application.
[0024] Figure 1 The SEM image of the product obtained by mixing 96 parts of PA66, 4 parts of acyl chloride nano diamond and 0.5 parts of tannin and then adding them into a rheometer for mixing. DETAILED DESCRIPTION
[0025] In order to make the objects, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application in combination with embodiments and drawings, the illustrative embodiments and the description thereof are only used to explain the present application, and do not limit the present application.
[0026] The preparation method of the acyl chloride diamond in the present application is as follows: 5 g of nanodiamond is dispersed in 200 mL of SOCl2, and ultrasonic treatment is performed for 30 min until no visible agglomerates are observed; then, 1 mL of DMF is added under nitrogen protection, and continuous stirring is performed for 1 h, and reaction is performed at 70 °C for 24 h; after the reaction is completed, the suspension is vacuum filtered through a 450 nm nylon membrane, the acyl chloride nanodiamond obtained by the vacuum filtration is washed with tetrahydrofuran for 3 times (200 mL each time), and then vacuum drying is performed at room temperature for 24 h to obtain the acyl chloride nanodiamond.
[0027] The nanodiamond is purchased from a commercial product, and the particle size is 5-10 nm.
[0028] Example 1
[0029] A papermaking press felt based on plain weave, comprising a surface fiber layer, a bottom fiber layer, and a TPU elastomer layer arranged between the surface fiber layer and the bottom fiber layer.
[0030] The thickness of the elastomer layer is 0.3 mm.
[0031] The preparation method of the surface fiber layer and the bottom fiber layer is as follows: 96 parts of PA66, 1 part of acyl chloride nanodiamond and 0.5 part of tannin are blended, and then added into a rheometer for mixing, followed by spinning, the spinning temperature is 280 °C, the room temperature is 30 °C, the relative humidity is 65%, and the spinning speed is 1500 m / s, to obtain a surface fiber layer with a length of 15 mm. The preparation method of the bottom fiber layer is the same as that of the surface fiber layer.
[0032] The preparation method of the papermaking press felt based on plain weave is as follows: the TPU elastomer layer is arranged between the surface fiber layer and the bottom fiber layer, and then heat treated at 85 °C for 2 h, followed by curing at 140 °C for 30 min; then, soaked in deionized water at 25 °C for 1 h, and then heat treated at 120 °C for 20 min.
[0033] Example 2
[0034] A papermaking press felt based on plain weave, comprising a surface fiber layer, a bottom fiber layer, and a TPU elastomer layer arranged between the surface fiber layer and the bottom fiber layer.
[0035] The thickness of the elastomer layer is 0.3 mm.
[0036] The preparation method of the surface fiber layer and the bottom fiber layer is as follows: 96 parts of PA66, 2 parts of acyl chloride nano diamond, and 0.5 parts of tannin are blended, and then added into a rheometer for mixing, followed by spinning, with a spinning temperature of 280 DEG C, a room temperature of 30 DEG C, a relative humidity of 65%, and a spinning speed of 1500 m / s, to obtain a length of 15 mm, and the surface fiber layer is obtained by spinning. The preparation method of the bottom fiber layer is the same as that of the surface fiber layer.
[0037] The preparation method of the papermaking press felt based on plain weaving is as follows: the TPU elastomer layer is placed between the surface fiber layer and the bottom fiber layer, heat treated at 85 DEG C for 2 hours, then cured at 140 DEG C for 30 minutes, soaked in deionized water at 25 DEG C for 1 hour, and then heat treated at 120 DEG C for 20 minutes.
[0038] Example 3
[0039] A papermaking press felt based on plain weaving, comprising a surface fiber layer, a bottom fiber layer, and a TPU elastomer layer arranged between the surface fiber layer and the bottom fiber layer.
[0040] The thickness of the elastomer layer is 0.3 mm.
[0041] The preparation method of the surface fiber layer and the bottom fiber layer is as follows: 96 parts of PA66, 3 parts of acyl chloride nano diamond, and 0.5 parts of tannin are blended, and then added into a rheometer for mixing, followed by spinning, with a spinning temperature of 280 DEG C, a room temperature of 30 DEG C, a relative humidity of 65%, and a spinning speed of 1500 m / s, to obtain a length of 15 mm, and the surface fiber layer is obtained by spinning. The preparation method of the bottom fiber layer is the same as that of the surface fiber layer.
[0042] The preparation method of the papermaking press felt based on plain weaving is as follows: the TPU elastomer layer is placed between the surface fiber layer and the bottom fiber layer, heat treated at 85 DEG C for 2 hours, then cured at 140 DEG C for 30 minutes, soaked in deionized water at 25 DEG C for 1 hour, and then heat treated at 120 DEG C for 20 minutes.
[0043] Example 4
[0044] A papermaking press felt based on plain weaving, comprising a surface fiber layer, a bottom fiber layer, and a TPU elastomer layer arranged between the surface fiber layer and the bottom fiber layer.
[0045] The thickness of the elastomer layer is 0.3 mm.
[0046] The preparation method of the surface fiber layer and the bottom fiber layer is as follows: 96 parts of PA66, 4 parts of acyl chloride nano diamond, and 0.5 parts of tannin are blended and then mixed by adding into a rheometer, followed by spinning, the spinning temperature is 280℃, the room temperature is 30℃, the relative humidity is 65%, and the spinning speed is 1500m / s, to obtain a surface fiber layer with a length of 15mm. The preparation method of the bottom fiber layer is the same as that of the surface fiber layer. Figure 1 The SEM diagram of the product obtained by blending 96 parts of PA66, 4 parts of acyl chloride nano diamond, and 0.5 parts of tannin and then mixing by adding into a rheometer.
[0047] The preparation method of the papermaking press felt based on plain weaving is as follows: the TPU elastomer layer is placed between the surface fiber layer and the bottom fiber layer, heat treated at 85℃ for 2 hours, then cured at 140℃ for 30 minutes, soaked in deionized water at 25℃ for 1 hour, and then heat treated at 120℃ for 20 minutes.
[0048] Example 5
[0049] A papermaking press felt based on plain weaving, comprising a surface fiber layer, a bottom fiber layer, and a TPU elastomer layer placed between the surface fiber layer and the bottom fiber layer.
[0050] The thickness of the elastomer layer is 0.3mm.
[0051] The preparation method of the surface fiber layer and the bottom fiber layer is as follows: 96 parts of PA66, 4 parts of acyl chloride nano diamond, and 0.5 parts of tannin are blended and then mixed by adding into a rheometer, followed by spinning, the spinning temperature is 280℃, the room temperature is 30℃, the relative humidity is 65%, and the spinning speed is 1500m / s, to obtain a surface fiber layer with a length of 15mm. The preparation method of the bottom fiber layer is the same as that of the surface fiber layer.
[0052] The preparation method of the papermaking press felt based on plain weaving is as follows: the TPU elastomer layer is placed between the surface fiber layer and the bottom fiber layer, heat treated at 85℃ for 2 hours, then cured at 140℃ for 30 minutes, soaked in deionized water at 25℃ for 1 hour, and then heat treated at 120℃ for 20 minutes.
[0053] Comparative Example 1
[0054] A papermaking press felt based on plain weaving, comprising a surface fiber layer, a bottom fiber layer, and a TPU elastomer layer placed between the surface fiber layer and the bottom fiber layer.
[0055] The thickness of the elastomer layer is 0.3mm.
[0056] The preparation method of the surface fiber layer and the bottom fiber layer is as follows: 96 parts of PA66, 4 parts of acyl chloride nano diamond are blended, and then added into a rheometer for mixing, followed by spinning, the spinning temperature is 280°C, the room temperature is 30°C, the relative humidity is 65%, and the spinning speed is 1500 m / s, to obtain a surface fiber layer with a length of 15 mm. The bottom fiber layer is prepared by the same method as the surface fiber layer.
[0057] The preparation method of the papermaking press felt based on plain weaving is as follows: the TPU elastomer layer is placed between the surface fiber layer and the bottom fiber layer, heat treated at 85°C for 2 hours, then cured at 140°C for 30 minutes, soaked in deionized water at 25°C for 1 hour, and then heat treated at 120°C for 20 minutes.
[0058] Comparative Example 2
[0059] A papermaking press felt based on plain weaving, comprising a surface fiber layer, a bottom fiber layer, and a TPU elastomer layer placed between the surface fiber layer and the bottom fiber layer.
[0060] The thickness of the elastomer layer is 0.3 mm.
[0061] The preparation method of the surface fiber layer and the bottom fiber layer is as follows: 96 parts of PA66, 4 parts of acyl chloride nano diamond are blended, and then added into a rheometer for mixing, followed by spinning, the spinning temperature is 280°C, the room temperature is 30°C, the relative humidity is 65%, and the spinning speed is 1500 m / s, to obtain a surface fiber layer with a length of 15 mm. The bottom fiber layer is prepared by the same method as the surface fiber layer.
[0062] The preparation method of the papermaking press felt based on plain weaving is as follows: the TPU elastomer layer is placed between the surface fiber layer and the bottom fiber layer, heat treated at 85°C for 2 hours, then cured at 140°C for 30 minutes, soaked in deionized water at 25°C for 1 hour, and then heat treated at 120°C for 20 minutes.
[0063] Test Example 1
[0064] The surface fiber layer and the bottom fiber layer in the examples and comparative examples are subjected to mechanical property testing, the tensile strength is tested according to GB / T1040-2006, and the bending strength is tested according to GB / T9341-2008.
[0065] Table 1 Performance Test
[0066] Tensile strength / MPa Flexural strength / MPa Example 1 73.5 95.2 Example 2 78.6 98.7 Example 3 79.6 101.5 Example 4 81.4 105.1 Example 5 81.9 109.3 Comparative Example 1 74.7 99.2 Comparative Example 2 75.1 97.3
[0067] As can be seen from Table 1, when only 4 wt% untreated nanodiamonds are added to PA66, the tensile / flexural strength is only 74.7 / 99.2 MPa, and when 4 wt% acyl chloride nanodiamonds are used alone, the tensile / flexural strength can be increased to 75.11 / 97.3 MPa, and when 0.5 wt% tannin is further added, the two indicators jump to 81.4 / 105.1 MPa, confirming that acyl chloride nanodiamonds and tannin work together to achieve a superimposed increase in fiber strength, which is much better than the effect of a single component.
[0068] The above detailed description of the specific embodiments has further detailed the purposes, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A flat-woven, papermaking press felt, characterized in that, From top to bottom, it comprises surface fiber layer, TPU elastomer layer and bottom fiber layer; the surface fiber layer and the bottom fiber layer are both formed by melt mixing and spinning of the following components: 96 parts by mass of PA66, 1-5 parts by mass of acyl chloride nano diamond, and 0.5 parts by mass of tannin.
2. The press felt according to claim 1, characterized in that The amount of the acyl chloride nano diamond is 4 parts by mass.
3. The press felt according to claim 2, characterized in that The acyl chloride nano diamond is prepared by the following steps: step S1: dispersing 5 g of nano diamond with a particle size of 5-10 nm in 200 mL of SOCl2, and ultrasonicating for 30 min until no agglomerates are observed by naked eye; Step S2: under the conditions of nitrogen protection and continuous stirring, adding 1 mL of DMF and reacting at 70°C for 24 h; Step S3: after the reaction is completed, vacuum filtration is performed, and the product is washed with 200 mL of tetrahydrofuran for 3 times; Step S4: vacuum drying at room temperature for 24 h to obtain the acyl chloride nano diamond.
4. The press felt according to claim 3, characterized in that The particle size of the nano diamond is 5-10 nm.
5. The press felt according to claim 1, characterized in that The spinning process parameters of the surface fiber layer and the bottom fiber layer are as follows: spinning temperature 280°C, ambient temperature 30°C, relative humidity 65%, spinning speed 1500 m / min, and the obtained fiber length is 15 mm.
6. The press felt according to any one of claims 1, characterized in that The thickness of the TPU elastomer layer is 0.3 mm.
7. A method of making a press felt according to any one of claims 1 to 6, characterized in that The method comprises the following steps: Step S11: placing the TPU elastomer layer between the surface fiber layer and the bottom fiber layer, and performing heat treatment; Step S12: temperature rising and curing; Step S13: soaking in deionized water at 25°C for 1 h; Step S14: heat treatment at 120°C for 20 min to obtain the press felt.
8. The method of claim 7, wherein, The temperature of the heat treatment in step S11 is 85°C, and the time is 2 h.
9. The method of claim 7, wherein, The curing temperature in step S12 is 140°C, and the time is 30 min.