Dust-free paper with high water absorption performance and preparation method of dust-free paper

Abstract

The invention discloses high-water-absorption dust-free paper and a preparation method thereof, the high-water-absorption dust-free paper is applied to the technical field of dust-free paper preparation, different types of wood pulp fibers such as bamboo pulp fibers and jute pulp fibers are introduced, so that the dependence on single fluff pulp in the prior art is reduced, meanwhile, the material performance is enriched, the introduced bamboo pulp fibers have the natural antibacterial property, and the high-water-absorption dust-free paper has the good water absorption performance. According to the dust-free paper disclosed by the invention, the applicability of the dust-free paper in the fields of medical treatment and health can be improved, and the bio-based polymer fibers are added as reinforcing fibers, so that the bio-based polymer fibers have better compatibility and binding force with wood pulp fibers and a macromolecular water-absorbing material, and the overall performance of the dust-free paper can be improved; by adding the high-molecular water-absorbing resin with long-acting temperature and the intelligent water-absorbing fiber, the performance stability after multiple times of water absorption and drying circulation can be ensured, the service life of the product is prolonged, the water absorption performance can be automatically adjusted according to the environment humidity and the moisture content, and the use requirements of different application scenes are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of dust-free paper preparation, and in particular relates to dust-free paper with high water absorption performance and a preparation method thereof. Background Art

[0002] Dust-free paper is made of wood pulp fibers a few millimeters long as the main raw material, and is produced through air-laid webs and different consolidation methods. This technology can produce materials of various thicknesses, softness, and hygroscopicity. Its products are mainly used in disposable sanitary products such as diapers, women's sanitary products, and adult incontinence products.

[0003] The absorbent layer of current sanitary products is mainly composed of fluff pulp, which has very limited absorption capacity. To achieve a certain absorption capacity, a large amount of wood pulp is required. In addition, existing products also add adhesives, resulting in a thick and heavy absorbent layer.

[0004] The existing technology uses SAF and SAP in dust-free paper at the same time. SAF and SAP not only exert their own liquid absorption characteristics, but also interact with each other to make up for their respective shortcomings.

[0005] Although the existing technology has provided solutions to the above problems, the polymer absorbent resins and polymer absorbent fibers used, although they perform well in improving water absorption performance, have the problem of decreased water absorption performance after multiple water absorption and drying cycles, and are unable to automatically adjust the water absorption performance according to the ambient humidity and moisture content, and cannot meet the usage requirements of different application scenarios.

[0006] To this end, we propose a high-absorbency dust-free paper and its preparation method that can ensure performance stability after multiple water absorption and drying cycles during use, extend the service life of the product, and automatically adjust the water absorption performance according to the ambient humidity and moisture content to meet the usage requirements of different application scenarios. Summary of the Invention

[0007] The purpose of the present invention is to propose a dust-free paper with high water absorption performance and a preparation method thereof. The advantages are that by introducing different types of wood pulp fibers, such as bamboo pulp fibers, hemp pulp fibers, etc., the dependence of the existing technology on single fluff pulp is reduced, and at the same time, the material properties are enriched. The introduced bamboo pulp fibers have natural antibacterial properties, which can improve the applicability of dust-free paper in the medical and sanitary fields. By adding bio-based polymer fibers as reinforcing fibers, they have better compatibility and bonding with wood pulp fibers and polymer water-absorbing materials, which can improve the overall performance of dust-free paper. Moreover, by adding long-lasting temperature polymer water-absorbing resins and intelligent water-absorbing fibers, the performance stability after multiple water absorption and drying cycles can be ensured, the service life of the product can be extended, and the water absorption performance can be automatically adjusted according to the ambient humidity and moisture content to meet the usage requirements of different application scenarios.

[0008] The above technical objectives of the present invention are achieved through the following technical solutions: a high water absorbency dust-free paper, comprising a lower layer, a middle layer and an upper layer, wherein the lower layer, the middle layer and the upper layer constitute a high water absorbency dust-free paper body;

[0009] The lower layer is composed of a mixture of various wood pulp fibers and reinforcing fibers, the middle layer is composed of mixed wood pulp fibers, long-lasting stable polymer water-absorbing resin and intelligent water-absorbing fibers, and the upper layer is composed of wood pulp fibers and reinforcing fibers.

[0010] By adopting the above technical solution, different types of wood pulp fibers, such as bamboo pulp fibers, hemp pulp fibers, etc., are introduced to reduce the dependence of existing technologies on single fluff pulp, while enriching material properties. The introduced bamboo pulp fibers have natural antibacterial properties, which can improve the applicability of dust-free paper in the medical and sanitary fields. By adding bio-based polymer fibers as reinforcing fibers, they have better compatibility and bonding with wood pulp fibers and polymer water-absorbing materials, which can improve the overall performance of dust-free paper. Moreover, by adding long-lasting temperature polymer water-absorbing resins and intelligent water-absorbing fibers, the performance stability after multiple water absorption and drying cycles can be ensured, thereby extending the service life of the product. In addition, the water absorption performance can be automatically adjusted according to the ambient humidity and moisture content to meet the usage requirements of different application scenarios.

[0011] The present invention is further configured as follows: the multiple wood pulp fiber mixture in the lower layer is formed by mixing bamboo pulp fiber, hemp pulp fiber and untreated fluff pulp in a ratio of 3:2:5, and the reinforcing fiber is bio-based polymer fiber.

[0012] The present invention is further configured as follows: the mixed wood pulp fibers in the middle layer are mixed by 40% recycled wood pulp and 60% virgin wood pulp in proportion, and the mixed wood pulp fibers, high molecular water-absorbing resin and smart water-absorbing fibers are 10-20 parts, 10-30 parts and 100-150 parts respectively.

[0013] The present invention is further configured as follows: the wood pulp fibers in the upper layer are treated to remove impurities and soften the surface, and the wood pulp fibers and the reinforcing fibers are 10-20 parts and 20-30 parts respectively.

[0014] The present invention is further configured such that the polymer water-absorbing resin in the middle layer is treated by adding a cross-linking agent and a stabilizer.

[0015] A high water-absorbent dust-free paper and a preparation method thereof, comprising the following steps:

[0016] S1. Raw material preparation: Accurately proportion various materials and use intelligent storage system to ensure the quality and stability of raw materials;

[0017] S2. Fiber processing: The wood pulp fibers are processed using a combination of ultrasonic pulverization and high-pressure water jet pulverization.

[0018] S3. Mixing: Dynamic stirring and airflow conveying are used to fully mix the treated fibers and polymer absorbent materials. Intelligent sensors monitor the mixing level in real time to ensure uniform distribution of the ingredients.

[0019] S4. Forming: Through precise airflow control and intelligent forming molds, the lower, middle, and upper layers of material are evenly spread on the forming net, ensuring thickness and uniformity, and obtaining the lower, middle, and upper layers respectively.

[0020] S5. Thermal bonding: An intelligent thermal bonding system uses infrared thermal bonding technology to automatically adjust the thermal bonding temperature and time based on real-time monitoring of material conditions and environmental parameters, allowing the lower, middle, and upper layers to be stacked and laminated in sequence to produce highly absorbent dust-free paper.

[0021] S6. Post-processing: The hot-bonded high-absorbency dust-free paper is post-processed, such as calendering, punching, etc., and then wound into rolls and finally cut into products of different specifications.

[0022] The present invention is further configured as follows: in step S3, the polymer water-absorbing material is first mixed with the reinforcing fiber and the smart water-absorbing fiber at a rotation speed of 1000-1500 rpm, and then the wood pulp fiber is added and mixed at a rotation speed of 500-800 rpm.

[0023] The present invention is further configured as follows: in step S3, the initial stage mixing time is 5-15 minutes, and the latter stage mixing time is 20-30 minutes.

[0024] The present invention is further configured as follows: in step S2, the power is set to 3-12 kW and the speed is set to 1300-1450 r / min.

[0025] The present invention is further configured as follows: in step S5, the thermal bonding temperature is set to 125-135° C., and the time is set to 8-25 seconds.

[0026] In summary, the present invention has the following beneficial effects:

[0027] By introducing different types of wood pulp fibers, such as bamboo pulp fiber and hemp pulp fiber, the reliance of existing technologies on single fluff pulp is reduced, while enriching material properties. The introduced bamboo pulp fiber has natural antibacterial properties, which can improve the applicability of dust-free paper in the medical and sanitary fields. The addition of bio-based polymer fibers as reinforcing fibers has better compatibility and bonding with wood pulp fibers and polymer water-absorbing materials, which can improve the overall performance of dust-free paper. Moreover, the addition of long-lasting temperature polymer water-absorbing resins and intelligent water-absorbing fibers can ensure performance stability after multiple water absorption and drying cycles, extend the service life of the product, and automatically adjust the water absorption performance according to the ambient humidity and moisture content to meet the usage requirements of different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a schematic flow chart of the method for preparing the dust-free paper with high water absorbency of the present invention.

[0030] Figure numerals: 1, lower layer; 2, middle layer; 3, upper layer. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Example 1:

[0033] refer to Figure 1 , a high water absorbent dust-free paper and a preparation method thereof, comprising a lower layer 1, a middle layer 2 and an upper layer 3, wherein the lower layer 1, the middle layer 2 and the upper layer 3 constitute a high water absorbent dust-free paper body;

[0034] The lower layer 1 is composed of a mixture of multiple wood pulp fibers and reinforcing fibers, the middle layer 2 is composed of mixed wood pulp fibers, long-lasting stable polymer water-absorbing resins and intelligent water-absorbing fibers, and the upper layer 3 is composed of wood pulp fibers and reinforcing fibers. By introducing different types of wood pulp fibers, such as bamboo pulp fibers, hemp pulp fibers, etc., the dependence of existing technologies on single fluff pulp is reduced, and at the same time, the material properties are enriched. The introduced bamboo pulp fibers have natural antibacterial properties, which can improve the applicability of dust-free paper in the medical and sanitary fields. The addition of bio-based polymer fibers as reinforcing fibers has better compatibility and bonding with wood pulp fibers and polymer water-absorbing materials, which can improve the overall performance of dust-free paper. Moreover, the addition of long-lasting temperature polymer water-absorbing resins and intelligent water-absorbing fibers can ensure performance stability after multiple water absorption and drying cycles, extend the service life of the product, and automatically adjust the water absorption performance according to the ambient humidity and moisture content to meet the usage requirements of different application scenarios.

[0035] The multiple wood pulp fiber mixture in the lower layer 1 is made of bamboo pulp fiber, hemp pulp fiber and untreated fluff pulp in a ratio of 3:2:5, and the reinforcing fiber is bio-based polymer fiber.

[0036] The mixed wood pulp fibers in the middle layer 2 are mixed by 40% recycled wood pulp and 60% virgin wood pulp in proportion, and the mixed wood pulp fibers, high molecular water-absorbing resin and smart water-absorbing fibers are 10-20 parts, 10-30 parts and 100-150 parts respectively.

[0037] The wood pulp fibers in the upper layer 3 are treated to remove impurities and soften the surface, and the wood pulp fibers and reinforcing fibers account for 10-20 parts and 20-30 parts respectively.

[0038] The high molecular weight water-absorbing resin in the middle layer 2 is treated by adding a cross-linking agent and a stabilizer.

[0039] Example 2:

[0040] refer to Figure 2 , a high water-absorbent dust-free paper and a preparation method thereof, comprising the following steps:

[0041] S1. Raw material preparation: Accurately proportion various materials and use intelligent storage system to ensure the quality and stability of raw materials;

[0042] S2. Fiber processing: The wood pulp fibers are processed using a combination of ultrasonic pulverization and high-pressure water jet pulverization.

[0043] S3. Mixing: Dynamic stirring and airflow conveying are used to fully mix the treated fibers and polymer absorbent materials. Intelligent sensors monitor the mixing level in real time to ensure uniform distribution of the ingredients.

[0044] S4. Forming: Through precise airflow control and intelligent forming molds, the materials for lower layer 1, middle layer 2, and upper layer 3 are evenly spread on the forming net, ensuring thickness and uniformity, resulting in lower layer 1, middle layer 2, and upper layer 3, respectively.

[0045] S5. Thermal Bonding: An intelligent thermal bonding system utilizes infrared thermal bonding technology to automatically adjust the thermal bonding temperature and time based on real-time monitoring of material conditions and environmental parameters, allowing the lower layer 1, middle layer 2, and upper layer 3 to be stacked and laminated in sequence to produce highly absorbent dust-free paper.

[0046] S6. Post-processing: The hot-bonded high-absorbency dust-free paper is post-processed, such as calendering, punching, etc., and then wound into rolls and finally cut into products of different specifications.

[0047] In step S3, the polymer water-absorbing material is first mixed with the reinforcing fiber and the smart water-absorbing fiber at a rotation speed of 1000-1500 rpm for 5-15 min, and then the wood pulp fiber is added and mixed for 20-30 min under the condition of reducing the rotation speed to 500-800 rpm.

[0048] In step S2, the power is set to 3-12 kW and the speed is set to 1300-1450 rpm.

[0049] In step S5, the thermal bonding temperature is set to 125-135° C., and the time is set to 8-25 seconds.

[0050] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as such modifications are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A dust-free paper with high water absorption performance, comprising a lower layer (1), a middle layer (2) and an upper layer (3), characterized in that: The lower layer (1), the middle layer (2) and the upper layer (3) constitute a main body of dust-free paper with high water absorption performance; The lower layer (1) is composed of a mixture of various wood pulp fibers and reinforcing fibers, the middle layer (2) is composed of mixed wood pulp fibers, long-lasting stable polymer absorbent resin and intelligent absorbent fibers, and the upper layer (3) is composed of wood pulp fibers and reinforcing fibers.

2. The highly absorbent dust-free paper according to claim 1, characterized in that: The multiple wood pulp fiber mixture in the lower layer (1) is formed by mixing bamboo pulp fibers, hemp pulp fibers and untreated fluff pulp in a ratio of 3:2:5, and the reinforcing fibers are bio-based polymer fibers.

3. The highly absorbent dust-free paper according to claim 1, characterized in that: The mixed wood pulp fibers in the middle layer (2) are mixed by 40% recycled wood pulp and 60% virgin wood pulp in proportion, and the mixed wood pulp fibers, high molecular water-absorbing resin and smart water-absorbing fibers are 10-20 parts, 10-30 parts and 100-150 parts respectively.

4. The highly absorbent dust-free paper according to claim 1, characterized in that: The wood pulp fibers in the upper layer (3) are treated to remove impurities and soften the surface, and the wood pulp fibers and reinforcing fibers account for 10-20 parts and 20-30 parts respectively.

5. The highly absorbent dust-free paper according to claim 1, characterized in that: The polymer water-absorbing resin in the middle layer (2) is treated by adding a cross-linking agent and a stabilizer.

6. A method for preparing a dust-free paper with high water absorption performance according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Raw material preparation: accurately proportion various materials and use intelligent storage system to ensure the quality and stability of raw materials; S2. Fiber processing: The wood pulp fibers are processed by combining ultrasonic pulverization and high-pressure water jet pulverization; S3. Mixing: The treated fibers, polymer absorbent materials, etc. are fully mixed by combining dynamic stirring and air flow conveying, and the degree of mixing is monitored in real time using intelligent sensors to ensure uniform distribution of the components; S4. Molding: Through precise airflow control and intelligent molding molds, the lower layer (1), middle layer (2) and upper layer (3) materials are evenly spread on the molding net to ensure thickness and uniformity, and the lower layer (1), middle layer (2) and upper layer (3) are obtained respectively; S5. Thermal bonding: An intelligent thermal bonding system is used, which utilizes infrared thermal bonding technology to automatically adjust the thermal bonding temperature and time according to the real-time monitoring of the material state and environmental parameters, so that the lower layer (1), the middle layer (2) and the upper layer (3) are stacked and compounded in sequence, thereby obtaining a dust-free paper with high water absorption performance; S6. Post-processing: The highly absorbent dust-free paper after thermal bonding is post-processed, such as calendering, punching, etc., and then rolled into rolls and finally cut into products of different specifications.

7. The method for preparing a dust-free paper with high water absorption performance according to claim 6, characterized in that: In step S3, the polymer water-absorbing material is first mixed with the reinforcing fiber and the smart water-absorbing fiber at a rotation speed of 1000-1500 rpm, and then the wood pulp fiber is added and mixed at a rotation speed of 500-800 rpm.

8. The method for preparing a dust-free paper with high water absorption performance according to claim 6, characterized in that: In step S3, the mixing time in the initial stage is 5-15 minutes, and the mixing time in the latter stage is 20-30 minutes.

9. The method for preparing a dust-free paper with high water absorption performance according to claim 6, characterized in that: In step S2, the power is set to 3-12 kW and the speed is set to 1300-1450 r / min.

10. The method for preparing a dust-free paper with high water absorption performance according to claim 6, characterized in that: In step S5, the thermal bonding temperature is set to 125-135° C., and the time is set to 8-25 s.

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