A digital paper tube for chemical fiber filament cake and its preparation method

Abstract

This invention relates to a digital paper tube for chemical fiber filament cakes and its preparation method. The invention includes an inner layer, formed by winding a tough paper-based material; a chip layer, comprising an RFID chip and an antenna electrically connected to the RFID chip; wherein the RFID chip is covered with a waterproof protective layer and pre-pressed onto the outer surface of the inner layer under a preset pressure; the antenna is spiral or annular and extends circumferentially with the inner layer, and its length matches the operating frequency of the RFID chip; a middle layer, wound and bonded to the outer surface of the inner layer with adhesive; an outer layer, bonded to the outer surface of the middle layer with adhesive; and a protective layer, including a flame-retardant layer on the outer surface of the outer layer and a thin film layer on the outer surface of the flame-retardant layer. By integrating the RFID chip inside the paper tube, not only is the problem of tag damage solved, but also automatic data collection throughout the entire process from spinning, warehousing to logistics can be achieved, significantly improving supply chain management efficiency.

Description

Technical Field

[0001] This invention relates to the field of intelligent manufacturing technology in spinning, and in particular to a digital paper tube for chemical fiber filament cakes and its preparation method. Background Technology

[0002] In the manufacturing, storage, and logistics of chemical fiber filament cakes, accurate tracking of product information is a key requirement for improving the industry's level of intelligence. Traditional paper tubes only serve as physical support carriers and cannot carry digital information. This leads to reliance on manual recording or external labeling for data such as product batches, specifications, and process parameters, resulting in low efficiency, susceptibility to errors and omissions, and easy damage to information.

[0003] In existing technologies, some companies have attempted to affix RFID tags or QR codes to the outer surface of paper tubes. However, due to a lack of protection, these external tags are susceptible to wear and tear during transportation and exposure to humidity, leading to information loss or unreadable data. Furthermore, the additional labeling process increases costs. Moreover, traditional paper tubes lack the ability to interact with production management systems in real time, making it difficult to meet the textile industry's requirements for data traceability. Summary of the Invention

[0004] To address this, the present invention provides a digital paper tube for chemical fiber filament cakes and its preparation method. By integrating an RFID chip inside the paper tube, not only is the problem of tag damage solved, but it also enables automatic data collection throughout the entire process from spinning, warehousing to logistics, significantly improving supply chain management efficiency.

[0005] To solve the above-mentioned technical problems, the present invention provides a digital paper tube for chemical fiber filament cakes, comprising: The inner layer is made of a tough paper-based material that is wound and formed. The chip layer includes an RFID chip and an antenna electrically connected to the RFID chip; wherein, the surface of the RFID chip is covered with a waterproof protective layer and is pre-pressed onto the outer surface of the inner layer under a preset pressure; the antenna is spiral or ring-shaped and extends circumferentially with the inner layer, and the length of the antenna is matched with the operating frequency of the RFID chip; The middle layer is wound and laminated to the outer surface of the inner layer by an adhesive; The outer layer is bonded to the outer surface of the middle layer using an adhesive. The protective layer includes a flame-retardant layer disposed on the outer surface of the outer layer and a thin film layer disposed on the outer surface of the flame-retardant layer.

[0006] In one embodiment of the present invention, the inner layer is made of resin-impregnated kraft paper or aramid fiber reinforced paper, the thickness of the inner layer is 0.5mm-1.2mm, and it is formed by spiral winding process or flat winding process.

[0007] In one embodiment of the present invention, the thickness of the middle layer is 2mm-5mm.

[0008] In one embodiment of the present invention, the waterproof protective layer is a polyurethane coating or an epoxy resin coating with a thickness of 0.05mm-0.2mm.

[0009] In one embodiment of the present invention, the middle layer is made of honeycomb corrugated paper or corrugated paper and is formed into a honeycomb structure or corrugated structure by spiral winding or parallel winding, with a winding density of not less than 8 layers / cm, so that the axial compressive strength of the formed digital paper tube is not less than 1200N / cm².

[0010] In one embodiment of the present invention, the outer layer is made of coated paper or white cardboard, and the surface of the outer layer is coated with a hydrophobic coating.

[0011] In one embodiment of the present invention, the flame retardant layer is a paper-based composite material layer, wherein the paper-based composite material layer contains 20%-30% by mass of aluminum hydroxide flame retardant or intumescent flame retardant, and the oxygen index is not less than 28%; The flame-retardant layer also contains nano-silica aerogel particles with a particle size of 50nm-100nm, so that the thermal conductivity of the flame-retardant layer is not greater than 0.03W / (m·K).

[0012] In one embodiment of the present invention, the film layer is a recycled polyester film or a recycled polypropylene film with a thickness of 50μm-80μm and a light transmittance of not less than 85%, and the outer surface of the film layer is matte treated.

[0013] In one embodiment of the present invention, the RFID chips are arranged periodically at intervals along the axial direction of the inner layer; the inner diameter of the digital paper tube matches the winding core of the chemical fiber filament cake, and the inner diameter tolerance range is ±0.5mm.

[0014] This invention also provides a method for preparing a digital paper tube for chemical fiber filament cakes, comprising: S1. Inner layer formation: A tough paper-based material is provided, which is resin-impregnated kraft paper or aramid fiber reinforced paper, and is wound onto a mandrel by a flat winding process or a spiral winding process. The thickness of the inner layer is controlled to be 0.5mm-1.2mm, the winding tension is controlled to be 150-220N / m, and the inner layer is obtained by hot air curing at 100℃-140℃ for 10min-30min. S2. Chip Layer Formation: A waterproof protective layer is formed on the front and back of the flexible RFID chip. The waterproof protective layer is a polyurethane coating or an epoxy resin coating, and the thickness on one side is 0.05mm-0.2mm. The RFID chip is pre-pressed and fixed to the outer surface of the inner layer under a preset pressure of 0.1MPa-0.3MPa using a mounting device. An antenna electrically connected to the RFID chip is provided. The antenna is spiral or ring-shaped and extends circumferentially along the inner layer so that the length of the antenna matches the operating frequency of the RFID chip. The RFID chips are arranged periodically at intervals along the axial direction of the inner layer. S3. Middle Layer Composite: A honeycomb corrugated paper or corrugated paper is provided. An adhesive is coated on the surface of the honeycomb corrugated paper or corrugated paper and spirally or parallelly wound and composited with the inner layer, so that the middle layer is wound to form a honeycomb structure or corrugated structure. The thickness of the middle layer is controlled to be 2mm-5mm, the winding density is controlled to be 8-10 layers / cm, and the composite pressure is controlled to be 0.3MPa-0.7MPa. Then, it is dried at 60℃-90℃ to form the middle layer, so that the axial compressive strength of the formed digital paper tube is not less than 1200N / cm². S4, Outer Layer Composite: Coated paper or white cardboard is provided, and the coated paper or white cardboard is composited on the outer surface of the middle layer by an adhesive to form an outer layer, and a hydrophobic coating is applied to the surface of the outer layer. S5. Formation of flame retardant layer: A paper-based composite material containing flame retardant is coated on the outer surface of the outer layer, and a flame retardant layer is formed by calendering. The flame retardant layer contains 20%-30% by mass of aluminum hydroxide flame retardant or intumescent flame retardant, and the oxygen index is not less than 28%. Nano-sized silica aerogel particles with a particle size of 50nm-100nm are added to the flame retardant layer so that the thermal conductivity of the flame retardant layer is not greater than 0.03W / (m·K). S6. Film Coating Protection: A recycled polyester film or recycled polypropylene film is bonded to the outer surface of the flame-retardant layer using a hot melt adhesive pre-coating process to form a film layer. The film layer has a thickness of 50μm-80μm and a light transmittance of not less than 85%. The outer surface of the film layer is matte treated. The temperature of the hot roller is controlled at 170℃-195℃ and the bonding pressure is 0.6MPa-1.0MPa to ensure that the peel strength is not less than 4N / 15mm. The inner diameter of the digital paper tube matches the winding core of the chemical fiber filament cake, and the inner diameter tolerance range is ±0.5mm.

[0015] The technical solution of the present invention has the following advantages compared with the prior art: This invention discloses a digital paper tube for chemical fiber filament cakes and its preparation method. During the paper tube processing, an RFID chip and antenna are pre-attached to the paper roll and embedded into the paper tube structure during the winding process. This overcomes the shortcomings of existing chemical fiber filament cake paper tubes, which have a single structure and limited functionality, achieving integrated reliability and intelligent functions. This digital paper tube not only has good processing adaptability and flame-retardant properties, but also enables data tracking and information interaction in production, circulation, and warehousing processes through the embedded chip. Simultaneously, the antenna is arranged circumferentially around the paper tube, effectively enhancing the coupling capability and signal radiation intensity of the RFID chip, improving reading distance and reading stability, and thus improving the reliability and consistency of data transmission.

[0016] In response to the high temperature and flammability characteristics of the chemical fiber industry's yarn cake manufacturing process, this invention sets a flame-retardant layer and a thin film layer on the outside of the paper tube, taking into account the protection requirements such as flame retardancy and anti-static properties, thereby reducing the risk of combustion and static electricity hazards during the production process, and improving the safety and process adaptability. Attached Figure Description

[0017] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] Figure 1 This is a cross-sectional view of the digital paper tube in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the chip layer structure in an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the periodic arrangement of RFID chips in an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the digital paper tube production process in an embodiment of the present invention.

[0022] Explanation of reference numerals on the accompanying drawings: 1. Inner layer; 2. Chip layer; 3. Antenna; 4. Middle layer; 5. Outer layer; 6. Flame retardant layer; 7. Thin film layer; 8. Waterproof protective layer; 9. RFID chip. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0024] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0025] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0026] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0027] Example 1 Reference Figure 1 , Figure 2 As shown, a digital paper tube for chemical fiber filament cakes according to the present invention includes: Inner layer 1 is made of a tough paper-based material that is wound and formed. Chip layer 2 includes an RFID chip 9 and an antenna 3 electrically connected to the RFID chip 9; wherein, the surface of the RFID chip 9 is covered with a waterproof protective layer 8 and is pre-pressed onto the outer surface of the inner layer 1 under a preset pressure; the antenna 3 is spiral or annular and extends circumferentially with the inner layer 1, and the length of the antenna 3 is matched with the operating frequency of the RFID chip 9. Middle layer 4 is wrapped and bonded to the outer surface of inner layer 1 by an adhesive; The outer layer 5 is bonded to the outer surface of the middle layer 4 by an adhesive. The protective layer includes a flame-retardant layer 6 disposed on the outer surface of the outer layer 5 and a thin film layer 7 disposed on the outer surface of the flame-retardant layer 6.

[0028] It should be noted that the RFID chip 9 has a flexible structure and is encapsulated with a silicone protective layer that is resistant to temperatures of 40℃~120℃. The winding layout can extend the length of the antenna 3, match the operating frequency of the RFID chip 9, and improve the resonance efficiency, thereby enhancing the signal strength and reading distance.

[0029] In addition, the antenna 3 is etched onto the PI film surface using a flexible PCB process, and the shape is divided and positioned by laser cutting to ensure the accuracy of the pattern and size. The cutting accuracy is controlled within ±0.05 mm.

[0030] The chip packaging uses a flip-chip bonding process to achieve electrical connection between the RFID chip 9 and the antenna 3 pads, and is encapsulated and protected with low dielectric constant epoxy resin. The relative dielectric constant εr of the encapsulation material is about 3.8 to balance electrical performance stability and environmental adaptability.

[0031] In one embodiment, the inner layer 1 is made of resin-impregnated kraft paper or aramid fiber reinforced paper, and the thickness of the inner layer 1 is 0.5mm-1.2mm. It is formed by a spiral winding process or a flat winding process. The inner layer 1 uses high-strength kraft paper or abrasion-resistant paper, and the toughness and tear resistance are enhanced by the impregnation process. The surface roughness is ≤3μm to ensure that friction damage is reduced when in contact with the chemical fiber filament cake.

[0032] In one embodiment, the thickness of the middle layer 4 is 2mm-5mm.

[0033] In one embodiment, the waterproof protective layer 8 is a polyurethane coating or an epoxy resin coating with a thickness of 0.05mm-0.2mm.

[0034] In one embodiment, the middle layer 4 is made of honeycomb corrugated paper or corrugated paper and is formed into a honeycomb structure or corrugated structure by spiral winding or parallel winding, with a winding density of not less than 8 layers / cm, so that the axial compressive strength of the formed digital paper tube is not less than 1200N / cm².

[0035] In one embodiment, the outer layer 5 is made of coated paper or white cardboard, and the surface of the outer layer 5 is coated with a hydrophobic coating (contact angle ≥110°).

[0036] In one embodiment, the flame-retardant layer 6 is a paper-based composite material layer, which contains 20%-30% by mass of aluminum hydroxide flame retardant or intumescent flame retardant, and has an oxygen index of not less than 28%. The flame-retardant layer 6 also contains nano-silica aerogel particles with a particle size of 50nm-100nm, so that the thermal conductivity of the flame-retardant layer 6 is not greater than 0.03W / (m·K).

[0037] In one embodiment, the film layer 7 is a recycled polyester film or a recycled polypropylene film with a thickness of 50μm-80μm and a light transmittance of not less than 85%, and the outer surface of the film layer 7 is matte treated.

[0038] In one embodiment, the RFID chip 9 is arranged periodically at intervals along the axial direction of the inner layer 1; the inner diameter of the digital paper tube matches the winding core of the chemical fiber filament cake, and the inner diameter tolerance range is ±0.5mm.

[0039] In one embodiment, the paper tube thickness is calculated and the layer thickness is allocated as follows: the outer diameter of the paper tube is 77 mm and the inner diameter is 69 mm, so the paper tube thickness is calculated based on the radius difference as (outer diameter - inner diameter) / 2 = (77 - 69) / 2 = 4 mm. Based on the above thickness constraints, the layer thickness is allocated as follows: inner layer 1 is 0.8 mm, middle layer 4 is 2.2 mm, and outer layer 5 is 1.0 mm, with a total thickness of 4.0 mm, which matches the outer diameter requirement.

[0040] Inner layer 1 paper dimensions: The width of the inner layer 1 paper corresponds to the circumference length after winding and forming. Calculating its circumference based on the inner diameter, the width = π × inner diameter = π × 69 mm ≈ 216.87 mm, rounded down to approximately 217 mm for industrial applications. The length of the inner layer 1 paper matches the axial length of the paper tube, with an overlap allowance for bonding and fixing. Length = paper tube length + overlap allowance = 290 mm + 5-10 mm, preferably 10 mm overlap allowance, resulting in an inner layer 1 paper length of approximately 300 mm.

[0041] Chip Layout and Density: Based on the above dimensional requirements, the antennas consist of three lines, and the RFID chips 9 are arranged periodically along the paper tube axis at a pitch of one chip every 300 millimeters. The specific arrangement is as follows: Figure 3 As shown. Therefore, the linear density of the chip is 1 / 300 mm = 0.00333 chips / mm, which is equivalent to 0.033 chips / cm.

[0042] The middle layer 4 adopts a corrugated paper structure with a flute height to flute pitch ratio of 1:3.5. The middle layer 4 is bonded with starch adhesive, and the wet strength retention rate of the adhesive system is not less than 90% to ensure structural stability and anti-delamination ability under high humidity conditions.

[0043] Nano-sized silica aerogel particles are incorporated into the flame-retardant layer 6 of the outer layer 5. The particle size of the aerogel particles is 50 to 100 nanometers to improve the overall heat insulation and flame-retardant performance of the outer layer 5. Preferably, the thermal conductivity of the flame-retardant layer 6 is not greater than 0.03 W / (m·K) to reduce heat conduction and heat accumulation under high-temperature conditions.

[0044] The outer layer 5 is coated with a hot melt adhesive pre-coating process to achieve composite molding. The peel strength of the coating structure is not less than 4N / 15mm. It can also remain undelaminated for 72 hours in a humid heat environment of 85℃ and 85% relative humidity to meet the requirements for humid heat resistance and reliability.

[0045] Example 2 Reference Figure 4 As shown, this embodiment provides a method for preparing a digital paper tube for chemical fiber filament cakes. The inner layer 1, middle layer 4, and outer layer 5 are respectively supplied from corresponding raw material paper rolls. After being shaped and tensioned by a stretching device, they enter a gluing device and a winding device for winding and laminating. An RFID chip 9 is arranged on the conveying path of the inner layer 1 through a chip placement device. The specific steps include: S1. Inner layer 1 formation: A tough paper base material is provided, which is resin-impregnated kraft paper or aramid fiber reinforced paper. After tension adjustment and belt stabilization by a stretching device, it is wound on a mandrel by a flat winding process or a spiral winding process. The thickness of the inner layer 1 is controlled to be 0.5mm-1.2mm, the winding tension is controlled to be 150-220N / m, and it is hot air cured at 100℃-140℃ for 10min-30min to obtain the inner layer 1. S2. Chip Layer 2 Formation: A flexible RFID chip 9 is arranged on the conveyor path of the inner layer 1 using a chip placement device. A waterproof protective layer 8 is formed on the front and back of the flexible RFID chip 9. The waterproof protective layer 8 is a polyurethane coating or an epoxy resin coating, and the thickness on one side is 0.05mm-0.2mm. The RFID chip 9 is pre-pressed and fixed to the outer surface of the inner layer 1 under a preset pressure of 0.1MPa-0.3MPa using a mounting device. An antenna 3 is provided that is electrically connected to the RFID chip 9. The antenna 3 is spiral or ring-shaped and extends circumferentially along the inner layer 1 so that the length of the antenna 3 matches the operating frequency of the RFID chip 9. The RFID chips 9 are arranged periodically at intervals along the axial direction of the inner layer 1. S3, Middle Layer 4 Composite: A honeycomb corrugated paper or corrugated paper is provided. The honeycomb corrugated paper or corrugated paper is output from the raw material paper roll used to form the middle layer 4. After being stretched by a stretching device, it enters the gluing device. Adhesive is applied to the surface of the honeycomb corrugated paper or corrugated paper and it is spirally wound or parallel wound and composited with the inner layer 1, so that the middle layer 4 is wound to form a honeycomb structure or corrugated structure. The thickness of the middle layer 4 is controlled to be 2mm-5mm, the winding density is controlled to be 8-10 layers / cm, and the composite pressure is controlled to be 0.3MPa-0.7MPa. Then it is dried at 60℃-90℃ to form the middle layer 4, so that the axial compressive strength of the formed digital paper tube is not less than 1200N / cm². S4, Outer Layer 5 Composite: Coated paper or white cardboard is provided. The coated paper or white cardboard is output from the raw material paper roll used to form the outer layer 5. After being stretched by the stretching device, it enters the gluing device. The coated paper or white cardboard is composited on the outer surface of the middle layer 4 by the adhesive to form the outer layer 5. A hydrophobic coating is applied to the surface of the outer layer 5. S5. Formation of flame-retardant layer 6: A paper-based composite material containing flame retardant is coated on the outer surface of the outer layer 5, and then calendered to form flame-retardant layer 6. Flame-retardant layer 6 contains 20%-30% by mass of aluminum hydroxide flame retardant or intumescent flame retardant, and the oxygen index is not less than 28%. Nano-sized silica aerogel particles with a particle size of 50nm-100nm are added to flame-retardant layer 6 so that the thermal conductivity of flame-retardant layer 6 is not greater than 0.03W / (m·K). S6. Film Coating Protection: Recycled polyester film or recycled polypropylene film is introduced into the coating device as the raw material for film layer 7. The recycled polyester film or recycled polypropylene film is bonded to the outer surface of the flame retardant layer 6 using a hot melt adhesive pre-coating process to form film layer 7. The thickness of film layer 7 is 50μm-80μm and the light transmittance is not less than 85%. The outer surface of film layer 7 is matte treated. The temperature of the hot roller is controlled at 170℃-195℃ and the bonding pressure is 0.6MPa-1.0MPa to ensure that the peel strength is not less than 4N / 15mm. The inner diameter of the digital paper tube matches the winding core of the chemical fiber filament cake, and the inner diameter tolerance range is ±0.5mm.

[0046] Example 3 This embodiment provides a method for preparing a digital paper tube for chemical fiber filament cakes, including: S1. Inner Layer 1 Formation: A tough paper base material is selected, which is aramid fiber reinforced kraft paper impregnated with phenolic resin, with a thickness of 0.8 mm. It is wound onto a mandrel using a flat-winding process, controlling the surface roughness of the paper layer to be no greater than 2.5 μm and the winding tension to be controlled at 180 N / m. After winding, it is hot-air cured at 120℃ for 20 min to obtain the tear-resistant inner layer 1.

[0047] S2. Chip Layer 2 Formation: A UHF RFID chip 9 (model Alien Higgs-9) is selected as the flexible RFID chip 9. A polyurethane waterproof protective layer 8 is sprayed onto both the front and back of the RFID chip 9, with a single-sided coating thickness of 0.1mm, to achieve moisture protection for chip encapsulation. Subsequently, an automatic placement machine is used to pre-press and fix the RFID chip 9 onto the outer surface of the inner layer 1 under a preset pressure of 0.2MPa. Simultaneously, an antenna 3, electrically connected to the RFID chip 9, is provided. The antenna 3 is made into a strip structure using copper foil etching technology and is spirally wound along the paper roll, extending circumferentially along the paper tube. This ensures that the length of the antenna 3 matches the 920MHz operating frequency, thereby reducing read / write direction dependence and improving read / write stability.

[0048] S3, Middle Layer 4 Composite: AA-type honeycomb corrugated paper was selected as the material for middle layer 4, with a flute height of 2.4 mm, a flute pitch of 8.4 mm, and a material thickness of 3.2 mm. A starch adhesive with a solid content of 45% was evenly coated onto the surface of the corrugated paper and then spirally wound and laminated with inner layer 1. The winding density was controlled at 9 layers / cm, and the lamination pressure was controlled at 0.5 MPa, so that middle layer 4 formed a honeycomb or corrugated structure, resulting in a compressive-resistant middle layer 4. After lamination, it was dried at 80℃, and the axial compressive strength of the manufactured digital paper tube was measured to be 1350 N / cm².

[0049] S4, Outer Layer 5 Composite: Coated paper or white cardboard is provided as the outer layer 5 material, and the outer layer 5 is composited on the outer surface of the middle layer 4 by adhesive; then a hydrophobic coating is applied to the surface of the outer layer 5 to improve the water resistance, stain resistance and service durability of the outer surface.

[0050] Formation of Flame Retardant Layer 6 (S5): A paper-based composite material is coated on the outer surface of the outer layer 5 to form flame retardant layer 6. The flame retardant used is aluminum hydroxide, accounting for 25% by mass, and the oxygen index of the paper-based composite material is 29%. Simultaneously, nano-silica aerogel particles with a particle size of 50 nm are added to the paper-based composite material at an addition amount of 8 wt%. The flame retardant layer 6, with a thickness of 0.6 mm, is obtained through three-roll calendering. Test results show that the thermal conductivity of flame retardant layer 6 is 0.028 W / (m·K). A complete carbonized layer can be formed after burning at 800℃ for 35 min, demonstrating good fire resistance and heat insulation performance.

[0051] S6. Coating Protection: A recycled polyester film, layer 7, is bonded to the outer surface of the flame-retardant layer 6 using a hot melt adhesive pre-coating process. The film is a 75μm thick rPET recycled film with a light transmittance of 87%. During the bonding process, the hot roller temperature is controlled at 185℃, the bonding pressure is 0.8MPa, and the peel strength reaches 4.8N / 15mm. The outer surface of layer 7 is matte-finished to achieve a gloss level of 15GU. After 96 hours of damp heat testing at 85℃ and 85%RH, no delamination occurred between layer 7 and the flame-retardant layer 6, indicating that the coating structure is stable and reliable.

[0052] In addition, the inner diameter of the digital paper tube is matched with the winding core of the chemical fiber filament cake, and the inner diameter tolerance is controlled within ±0.5mm to ensure loading and unloading fit and winding stability.

[0053] Performance verification: In terms of RFID performance, the success rate of reading within a 5m reading distance is 99.7%, and the false reading rate is 0.2%, demonstrating the signal stability advantage of the three-layer spiral antenna arrangement.

[0054] In terms of environmental adaptability, the film showed no cracks after being frozen at -30℃ for 48 hours, and the RFID chip 9 functioned normally under high temperature conditions of 120℃, demonstrating its ability to adapt to temperature and humidity fluctuations and working conditions in the chemical fiber workshop.

[0055] Application Results: The digital paper tubes developed in this embodiment were applied to the packaging process of chemical fiber filament cakes in a chemical fiber company. Process parameters such as production batch, weight, and winding tension can be written into the RFID chip 9, enabling traceable management of the filament cake information. In the warehousing process, fixed readers enable real-time monitoring of the inventory status of approximately 2000 paper tubes, improving inventory efficiency by 80%. In the logistics process, the chip data is linked with a GPS positioning system, reducing the damage rate by 67%.

[0056] This digital paper tube has the following advantages: High reliability: It adopts a multi-layer composite structure to achieve a synergistic improvement in mechanical strength, data interaction and fire protection, including an axial bearing capacity increase of 40%, an RFID reading distance of no less than 5m, and a flame retardant protection time extended to 30min.

[0057] Intelligent upgrade: The flexible RFID chip supports data writing and updating, and can store key traceability information such as the production batch and weight of the silk cake, realizing digital management of the entire silk cake process.

[0058] High process compatibility: Utilizing a spiral winding process, it can be directly adapted to existing paper tube production lines, reducing production line modification costs by 60%. Furthermore, the RFID chip is placed on the raw paper during the traditional paper tube winding process and wound into the paper tube by the winding machine, thus requiring minimal changes to the original production process and being easy to manufacture. Figure 4 As shown.

[0059] Signal stability optimization: The RFID antenna adopts a winding distribution design, which reduces direction dependence and blockage sensitivity, reducing the RFID false reading rate from 5% in traditional solutions to 0.2%.

[0060] In summary, this digital paper tube can achieve chip embedding, enhanced compressive strength, flame retardancy and heat insulation, and film protection without significantly changing the traditional paper tube winding process. It is suitable for the chemical fiber and textile industries, especially for packaging chemical fiber filament cakes that require high-temperature dyeing processes, and realizes digital management of the entire life cycle from production, warehousing to logistics.

[0061] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A digital paper tube for use with a synthetic filament cake, characterized by, include: The inner layer (1) is made of a tough paper-based material that is wound and formed. Chip layer (2), the chip layer (2) includes an RFID chip (9) and an antenna (3) electrically connected to the RFID chip (9); wherein, the surface of the RFID chip (9) is covered with a waterproof protective layer (8) and is pre-pressed onto the outer surface of the inner layer (1) under a preset pressure; the antenna (3) is spiral or annular and extends circumferentially with the inner layer (1), and the length of the antenna (3) matches the operating frequency of the RFID chip (9); The middle layer (4) is wrapped and bonded to the outer surface of the inner layer (1) by an adhesive. The outer layer (5) is bonded to the outer surface of the middle layer (4) by an adhesive. The protective layer includes a flame-retardant layer (6) disposed on the outer surface of the outer layer (5) and a thin film layer (7) disposed on the outer surface of the flame-retardant layer (6).

2. A digital paper tube for use in a bobbins of synthetic fiber filaments according to claim 1, characterized in that, The inner layer (1) is made of resin-impregnated kraft paper or aramid fiber reinforced paper, and the thickness of the inner layer (1) is 0.5mm-1.2mm. It is formed by spiral winding or flat winding.

3. A digital paper tube for use in a bobbins of synthetic fiber filaments according to claim 1, characterized in that, The thickness of the middle layer (4) is 2mm-5mm.

4. The digital paper tube for use in a filament cake of synthetic fiber according to claim 1, characterized in that, The waterproof protective layer (8) is a polyurethane coating or an epoxy resin coating with a thickness of 0.05mm-0.2mm.

5. The digital paper tube for use in a filament cake of synthetic fiber according to claim 1, characterized in that, The middle layer (4) is made of honeycomb corrugated paper or corrugated paper and is formed by spiral winding or parallel winding to form a honeycomb structure or corrugated structure. The winding density is not less than 8 layers / cm, so that the axial compressive strength of the formed digital paper tube is not less than 1200N / cm².

6. A digital paper tube for use in a bobbins of synthetic fiber filaments according to claim 1, characterized in that, The outer layer (5) is made of coated paper or white cardboard, and the surface of the outer layer (5) is coated with a hydrophobic coating.

7. A digital paper tube for use in a bobbins of synthetic fiber filaments according to claim 1, characterized in that, The flame retardant layer (6) is a paper-based composite material layer, which contains 20%-30% by mass of aluminum hydroxide flame retardant or intumescent flame retardant, and has an oxygen index of not less than 28%. The flame retardant layer (6) also contains nano-silica aerogel particles with a particle size of 50nm-100nm, so that the thermal conductivity of the flame retardant layer (6) is not greater than 0.03W / (m·K).

8. A digital paper tube for use in a bobbins of synthetic fiber filaments according to claim 1, characterized in that, The film layer (7) is a recycled polyester film or a recycled polypropylene film with a thickness of 50μm-80μm and a light transmittance of not less than 85%. The outer surface of the film layer (7) is matte treated.

9. A digital paper tube for chemical fiber filament cakes according to claim 1, characterized in that, The RFID chip (9) is arranged periodically at intervals along the axial direction of the inner layer (1); the inner diameter of the digital paper tube matches the winding core of the chemical fiber filament cake, and the inner diameter tolerance range is ±0.5mm.

10. A method for preparing a digital paper tube for chemical fiber filament cakes, characterized in that, include: S1. Inner layer (1) formation: Provide a tough paper base material, which is resin-impregnated kraft paper or aramid fiber reinforced paper, and wind it on a mandrel by a flat winding process or a spiral winding process. Control the thickness of the inner layer (1) to be 0.5mm-1.2mm, control the winding tension to be 150-220N / m, and cure it with hot air at 100℃-140℃ for 10min-30min to obtain the inner layer (1). S2, Chip layer (2) formation: A waterproof protective layer (8) is formed on the front and back of the flexible RFID chip (9). The waterproof protective layer (8) is a polyurethane coating or an epoxy resin coating, and the thickness on one side is 0.05mm-0.2mm. The RFID chip (9) is pre-pressed and fixed to the outer surface of the inner layer (1) under a preset pressure of 0.1MPa-0.3MPa using a mounting device. An antenna (3) electrically connected to the RFID chip (9) is provided. The antenna (3) is spiral or ring-shaped and extends circumferentially along the inner layer (1) so that the length of the antenna (3) matches the operating frequency of the RFID chip (9). The RFID chip (9) is periodically spaced along the axial direction of the inner layer (1). S3, Middle Layer (4) Composite: Provide honeycomb corrugated paper or corrugated paper, apply adhesive to the surface of the honeycomb corrugated paper or corrugated paper and spirally or parallelly wind and composite with the inner layer (1), so that the middle layer (4) is wound to form a honeycomb structure or corrugated structure, control the thickness of the middle layer (4) to be 2mm-5mm, control the winding density to be 8-10 layers / cm, control the composite pressure to be 0.3MPa-0.7MPa, and then dry at 60℃-90℃ to form the middle layer (4), so that the axial compressive strength of the formed digital paper tube is not less than 1200N / cm²; S4, Outer layer (5) composite: Provide coated paper or white cardboard, and composite the coated paper or white cardboard onto the outer surface of the middle layer (4) by means of adhesive to form an outer layer (5), and coat the surface of the outer layer (5) with a hydrophobic coating; S5. Formation of flame retardant layer (6): A paper-based composite material containing flame retardant is coated on the outer surface of the outer layer (5), and the flame retardant layer (6) is formed by calendering. The flame retardant layer (6) contains 20%-30% by mass of aluminum hydroxide flame retardant or intumescent flame retardant, and the oxygen index is not less than 28%. Nano-sized silica aerogel particles with a particle size of 50nm-100nm are added to the flame retardant layer (6) so that the thermal conductivity of the flame retardant layer (6) is not greater than 0.03W / (m·K). S6, Film protection: A recycled polyester film or recycled polypropylene film is bonded to the outer surface of the flame retardant layer (6) using a hot melt adhesive pre-coating process to form a film layer (7). The film layer (7) has a thickness of 50μm-80μm and a light transmittance of not less than 85%. The outer surface of the film layer (7) is matte treated. The temperature of the hot roller is controlled at 170℃-195℃ and the bonding pressure is 0.6MPa-1.0MPa so that the peel strength is not less than 4N / 15mm. The inner diameter of the digital paper tube matches the winding core of the chemical fiber filament cake, and the inner diameter tolerance range is ±0.5mm.

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