Wet Papermaking Research Articles

Properties regulation of carbon paper through incorporating lignin-based carbon nanofibers

Carbon paper is commonly used as one of the electrode materials in batteries, where its main function is to serve as a conductive material, providing a channel for electron transport, and also helping to improve the conductivity and stability of the battery. Therefore, it is necessary to study how to improve the performance of carbon paper. This study aims to enhance the performance of carbon paper used in proton exchange membrane fuel cells (PEMFCs) by incorporating lignin-based carbon nanofibers (CNFs). We investigated the effects of different process flows, papermaking methods, and the addition amount of ligninbased carbon fibers on the performance of carbon paper. The research indicates that using the wet papermaking method and the process of electrospinning, impregnation and hot pressing, addition of lignin nanofibers, pre-oxidation, impregnation and hot pressing, and carbonization can yield carbon paper with the best overall performance. The tensile strength is 9.4 mPa, the flexural strength is 390 mPa, the air permeability is 1320 L/m²/s, and the resistivity is 15 mΩ/cm. This significantly improves its mechanical strength, air permeability, and electrical conductivity, making it a promising material for PEMFCs.

Preparation of High‐Temperature‐Resistant Polybenzoxazole Paper by a Two‐Step Method

Polybenzoxazole (PBO) paper, made of PBO chopped fibers and PBO fibrids, is used in many cutting‐edge fields because of its excellent properties. The rigid molecular structure makes PBO only dissolved in strong acids such as fuming sulfuric acid and polyphosphoric acid at a very high temperature. Due to the harsh preparation conditions, it is not easy to industrialize PBO fibrids. Herein, a two‐step method was used to prepare the PBO paper. Firstly, polyhydroxyamide (PHA) was synthesized in an organic solvent and used to prepare fibrids, and the PHA paper was then prepared using PHA fibrids with a traditional wet papermaking process, and the obtained PHA paper was further converted into PBO paper by thermal cyclization. The results show that the PHA fibrids have a high length–diameter ratio, film shape, and abundant hair structure, and the tensile index of the PHA base paper is as high as 123.3 N·m/g. After thermal cyclization, the structure and morphology of the paper have little change, and the mechanical properties of the paper have a certain loss. However, it is still much higher than that of PBO paper prepared directly from PBO fibrids and has excellent thermal stability, so it is suitable for preparing high‐temperature‐resistant paper‐based composites.

Improvement of carbon paper performance by adding carbon nanofibers to carbon paper and impregnation

Carbon paper, as a key component in proton exchange membrane fuel cells (PEMFCs), had attracted much attention due to its corrosion resistance, electrical conductivity and mechanical strength as well as gas permeability. The incorporation of carbon nanofibers (CNFs) into carbon paper can further enhance its electrical conductivity and other properties. Herein, prepared carbon paper precursors (CPP) via wet papermaking and optimized the process through resin impregnation and hot pressing. The addition of CNFs, particularly at 10 %, significantly improved electrical conductivity and mechanical properties, reducing resistivity by 23.9 % and maximizing tensile strength of 36.97 N·m/g. The sequence of CNFs application and resin impregnation, specifically the spray-after-impregnation (S-I) method, was crucial for achieving these enhancements. Our findings offer a strategy for fabricating high-performance carbon paper, crucial for PEMFC efficiency and durability.

High throughput PTFE@PPS /ACFs porous membrane for continuous highly effective oil-water separation

We proposed a feasible and straightforward approach for fabricating a superhydrophobic polytetrafluoroethylene coated polyphenylene sulfide/aramid composite film (PTFE@PPS/ACFs porous membrane) for oil-water separation. This process involves utilizing a wet paper making process combined with a spray coating technique. The PPS/ACFs composite membrane displays a three-dimensional network structure by the application of wet papermaking approach. The uniformly spray coating of PTFE on its surface results in a superhydrophobic PTFE@PPS/ACFs porous membrane (PPAM). The membrane obtained through this method can effectively separate oil and water. It is remarkable in separating oil-water lotion stabilized by surfactant, achieving a separation efficiency of up to 99.9 % with a high flux of 8000 L/m2·h−1. Additionally, owing to the inherent thermal stability of the membrane, the PPAM is recyclable. In summary, the PTFE@PPS/ACFs porous membrane is a promising for separating various oil-water emulsions. Its outstanding performance, including high separation efficiency, flux, and recyclability, underscores its potential for practical applications for oil-water separation.

Rigid-flexible coupling poly (phenylene sulfide) fiber membrane: a highly stable chemical and thermal material for energy and environmental applications

The poly (phenylene sulfide) (PPS) fiber membrane is composed of interwoven fibers, with a three-dimensional porous structure. The three-dimensional porous structure makes PPS fiber membranes have high porosity and large specific surface area, which stands out in the field of membrane separation. A PPS fiber is a high-performance fiber with excellent chemical and thermal stability. These characteristics allow PPS fiber membranes to be used in harsh membrane separation environments such as strong acids, alkalis, and high temperatures. However, the corrosion resistance and high-temperature stability of PPS fibers also make the preparation of PPS fibers and their membranes challenging. In this paper, the preparation method is summarized, including two direct methods to make a PPS fiber membrane: melt-blown spinning and melt electrostatic spinning, and two indirect methods: wet papermaking and weaving. Additionally, the applications of PPS fiber membranes are summarized in detail in energy and environmental fields, such as lithium-ion batteries, alkaline water electrolysis, air filtrations, chemical catalyst substrates, and oil-water separations. This review provides an insightful understanding of PPS fiber membrane preparation methods and the interconnections between these preparation methods and specific applications, thus laying a solid foundation for further advancing the range of PPS fiber membrane applications.

Study on the Rapid Degradation Performance of Salix/Wheat Straw Fiber Degradable Film

The preparation of biodegradable mulch film to replace non-degradable mulch film is of great significance for reducing the harm of non-degradable agricultural mulch film to the environment. However, there are few studies on the degradation performance and degradation mechanisms of degradable cellulose mulch. Therefore, the wet papermaking process was adopted in this work. Salix fiber and wheat straw fiber were used as raw materials. A Salix/wheat straw fiber degradable film was prepared by adding cationic polyacrylamide, alkyl ketene dimer, and paraffin emulsion. The degradation process of cellulose film was studied using a UV degradation test and an acid-base degradation test system. The results showed that after 40 days of UV degradation, the degradation rate of Salix/wheat straw fiber degradable film could reach 6.66%. The tensile strength could still maintain 2.878 KN/m. The results of the brightness change index (ΔL) and color overall change index (ΔE) showed that the surface of the Salix/wheat straw fiber degradable film had been successfully partially degraded. After 4 days of alkaline degradation, the degradation rate could reach 11.89%. After 4 days of acid degradation, the degradation rate could reach 14.64%. At the same time, the specific degradation process of Salix/wheat straw fiber degradable film was further studied by infrared spectroscopy and scanning electron microscopy. This work provides a new method for the study of agricultural degradable cellulose mulch, which is of great significance for the future development of agricultural mulch.

Facile fabrication of cellulose-based hydrophobic paper via Michael addition reaction

The inherent highly hydrophilic feature of cellulose-based paper hinders its application in many fields. Herein, a cellulose-based hydrophobic paper was fabricated based on surface chemical modification. Firstly, the hydrophobic acrylate components were bonded to the cellulose acetoacetate (CAA) fibers to obtain CAA graft acrylate (CAA-X) fibers through Michael addition reaction. Subsequently, CAA-X fibers were processed into paper via wet papermaking technology. The resulting paper exhibited good hydrophobic performance (water contact angle was up to 135°) with an air permeability of 24.8 μm/Pa·s. The hydrophobicity of paper was very stable and remained even after treating with different solvents. Moreover, the hydrophobic properties of this paper could be adjusted by changing the type of acrylate component. It should be noted that the surface modification strategy has no obvious effects on the whiteness (79.8%), writing, and printing properties of the cellulose fibers. Thus, it is a simple, benign, and efficient strategy for the construction of cellulose-based hydrophobic paper, which has great potential to be used in paper tableware, oil-water separation, watercolor protection, and food packaging fields.

Polylactide/cellulose pulp composite paper with laminate structure via polylactide ultrafine fiber for eco-friendly straw

Paper straws with environmental friendliness have been widely used to replace plastic straws, but their poor mechanical properties and uncontrollable deformation bring an unsatisfactory experience for users. Herein, we developed a polylactic acid/cellulose fiber (PLA/CF) ultrafine-fiber paper with a sandwich‐like structure via wet papermaking and laminated hot pressing, employing PLA ultrafine fiber and CF as raw materials. The PLA/CF ultrafine fiber paper has remarkable mechanical properties due to the tangling of the fibers and the strong hydrogen bonding that occurs between the PLA and CF during hot pressing. The test results demonstrate that the tensile strength of PLA/CFs ultrafine fiber paper can reach 60.32 N/cm, and it still retains great wet strength (27 N/cm) and stiffness (117.7 mN·cm) after long-time service in various clod and hot liquids. Besides, PLA/CF ultrafine fiber paper also displays high biodegradability, with a degradation rate of 70% after being buried in soil for 120 days. We believe that PLA/CF ultra-fine fiber paper with excellent comprehensive performance can be expected to completely replace plastic straws.

Controllable interfacial coupling of graphene in papermaking process for selective bio-detection with high sensitivity

Carbon paper-based electrochemical sensors offer the possibility of long-term in vivo monitoring of the biomarkers due to their chemical stability and porous structure. However, the serious self-staking and aggregation of the carbon materials seriously block the diffusion of target biomolecules and limit the sensitivity and selectivity of the device. Here we report a controllable interfacial coupling strategy in which a composite paper electrode made by electrostatic self-assembling reduced graphene oxide (rGO) on carbon fiber (CF) modified with cationic polyacrylamide to avoid the self-stacking in scalable wet papermaking and thus increased accessible electrochemically active surface area and accelerate the diffusion of biomarkers. The resulting composite paper shows improved stability, high selectivity, long-durability, and excellent sensitivity in the electrochemical detection of biomarkers such as ascorbic acid, dopamine, and uric acid. Our approach, which combines mature industrial paper technology with interface engineering and electrochemical reduction, offers a potential avenue for low-cost and scalable implantable electrodes for timely and long-term monitoring in the surgical and clinical applications.

High performance porous Ni@Cf paper with excellent electromagnetic shielding properties

Carbon fiber (Cf) is one of the ideal electromagnetic shielding materials due to its excellent high electrical conductivity and electromagnetic interference resistance properties. In this work, the wet papermaking process was employed to prepare high performance porous Cf paper with the electromagnetic shielding effectiveness (SET) of 60 dB in the X-band, and porous Ni@Cf paper with enhanced SET performance was manufactured using chemical plating. This approach employs a palladium-free activation procedure that is simple and inexpensive, while avoiding using environmentally harmful PdCl2. Ni@Cf paper's three-dimensional network structure has superior conductivity of 400 s/cm at a thickness of 0.36 mm and SET of 120 dB in the X-band, shielding more than 99.99 % electromagnetic radiation. Besides, it also offers excellent air permeability, hydrophobicity, salt spray corrosion resistance, and mechanical properties. Therefore, new porous Ni@Cf paper proposed in this study is of great significance, which has potential value in aerospace, military and other fields.

Biomimetic and flexible high-performance carbon paper prepared by welding three-dimensional carbon fiber network with polyphenylene sulfide spherical sites for fuel cell gas diffusion layer

High-performance carbon fiber paper (CFP) is usually an important part of the fuel cell gas diffusion layer (GDL). However, the preparation of CFP for GDL is still a challenge due to its arduous preparation process. Here, inspired by the structure of bird's nest in nature, we present the original design of PPS spherical sites welding three-dimensional (3D) carbon fiber network to produce high-performance CFP by facile wet papermaking and heat treatment. With a 3D CF network as the skeleton and PPS spherical sites as the welding points, CFs/PPS composite paper exhibits good mechanical strength and outstanding flexibility. Meanwhile, the excellent conductivity (6.8 S/cm) is integrated with super-hydrophobic performance, electrothermal performance (Tmax = 365 °C), heat resistance (DTGmax>575 °C), and corrosion resistance, becoming a high-performance multifunctional CFP. The mythical combination of these properties makes CFs/PPS composite paper an ideal candidate in the field of fuel cell GDL. In addition, the evolution of chemical structure of CF/PPS during carbonization is emphasized, which is of great significance for the properties of composite paper. This work presents a leap forward in the preparation of multi-property high-performance CFP in a simple method and is a key step toward exploring how the structural changes of CFs/PPS composite paper can be understood during carbonization.

Facile Preparation of a Lightweight and Ultra-Thin Nonwoven Carbon Fiber Film with Excellent Electromagnetic Interference Shielding Performance

In this work, a porous, ultra-thin, mechanically strong, and flexible non-woven carbon fiber structured film (NCFF) was fabricated, which exhibited excellent electromagnetic interference (EMI) shielding performance. More specifically, a non-woven raw paper precursor was first constructed by using the wet paper-making method from the short-cut carbon fibers. Afterward, the consecutive procedures of resin impregnation and heat press were applied to obtain NCFF. The morphology, porosity, mechanical properties, and EMI shielding performance of the proposed NCFF were thoroughly investigated to examine the impact of resin concentration and compression pressure. Furthermore, electroless nickel (Ni) plating was also conducted on the optimized NCFF structure to further improve the EMI shielding performance. From the acquired results, it was demonstrated that the optimal NCFF with a thickness value of only 95 μm and a tensile strength of 83.98 MPa (X direction)/47.37 MPa (Y direction) was achieved by using the resin concentration of 15 wt% and the compression pressure of 1.5 MPa. Moreover, the proposed film exhibited excellent EMI shielding effectiveness (EMI-SE) of 40.97 dB, whereas the EMI-SE of the Ni-plated NCFF composite was significantly improved to 79.33 dB. Both films demonstrated also low density in conjunction with excellent electrical conductivity, mechanical strength, and EMI shielding performance at a much thinner thickness compared with the other lightweight electromagnetic shielding materials reported in the literature. As a result, a wide application prospect in aviation, aerospace, telecommunications, and military industries was proved by the proposed material configuration.

Physical Properties of Pulp and Paper: A Comparison of Forming Procedures

Abstract In this work, we used the conventional wet papermaking process and the solution casting procedure to make paper sheets and optimized the relative content of eucalyptus and Simao pine pulps using the mechanical properties of the paper sheet as the evaluation index. The chemical composition, water retention value, zeta potential, carboxyl content, and drainage behavior of the pulp created using the optimal mass ratio for each method were measured, and the resulting paper sheets were characterized via Fourier-transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and nitrogen adsorption/desorption isotherms. We found that for a ratio of eucalyptus to Simao pine pulps of 94:6 using the wet papermaking process, the mechanical properties of sheets took their optimal values, and the tear, tensile, and burst indexes and the folding endurance were equal to 4.43 mN·m2·g−1, 27.47 N·m·g−1, 1.13 kPa·m2·g−1, and 11.38 times, respectively, whereas the ratio leading to the best possible mechanical performance in the solution casting process was 88:12, and the corresponding paper sheets had tear, tensile, and burst indexes and the folding endurance of 11.73 mN·m2·g−1, 23.03 N·m·g−1, 0.68 kPa·m2·g−1, and 25.50 times, respectively. The cellulose, hemicellulose, and lignin contents of the pulp treated by the solution casting method were lower by 1.88, 3.11, and 2.67 percent, respectively, compared to that obtained via the wet papermaking process. However, the water retention value, zeta potential, and carboxyl content of the pulp obtained via solution casting were higher by 50.31, 123.41, and 50.15, percent, respectively, compared to that obtained via the wet papermaking process. The drainage time obtained via the solution casting method was one-fifth of that obtained via the wet forming process. The paper sheet prepared via the solution casting method was found to exhibit weaker hydrogen bonding, a decreased level of crystallinity (26.64% lower), and an increased compactness and N2 gas adsorption capacity (19.55% and 66.7% higher, respectively) compared to the sheet obtained via the wet papermaking process. This work shows that the physical properties of the paper prepared via the two processes considered here, using their respective optimal weight ratios of the different types of pulp, have their own advantages.

Fiber swelling to improve cycle performance of paper-based separator for lithium-ion batteries application

It is well established that paper-based separators display short-circuit risk in lithium-ion batteries due to their intrinsic micron-sized pores. In this research, we have adjusted pore structure of paper by fiber swelling in liquid electrolyte. Specifically, the paper-based separator is prepared by propionylated sisal fibers through a wet papermaking process. Scanning electron microscope (SEM) and multi-range X-ray nano-computed tomography (CT) images display strong swelling of modified fibers after electrolyte absorption, which can effectively decrease the pore size of separator. Due to the high electrolyte uptake (817 wt%), paper-based separator exhibits ionic conductivity of 2.93 mS cm−1. 7Li solid-state NMR spectroscopy and Gaussian simulation reveal that the formation of local high Li+ ion concentration in the separator and its low absorption energy with Li+ ion (62.2 kcal mol−1) is conducive to the ionic transportation. In particular, the assembled Li/separator/LiFePO4 cell displays wide electrochemical stability window (5.2 V) and excellent cycle performance (capacity retention of 96.6% after 100 cycles at 0.5 C) due to the reduced side reactions as well as enhanced electrolyte absorption and retention capacity by propionylation. Our proposed strategy will provide a novel perspective to design high-performance bio-based separators to boost the development of clean and sustainable energy economy.

Economical preparation of high-performance activated carbon fiber papers as self-supporting supercapacitor electrodes

The cellulose-based paper electrode has attracted increasing attention for wearable and portable electronic devices. However, the loading of expensive electroactive substances, a large proportion of cellulose matrix and the loss of mechanical flexibility limit its commercial application. This article reports a facile and economical strategy for fabricating high-performance cellulose-based activated carbon fiber papers (ACFPs), which can be used as self-supporting supercapacitor electrodes without any binder. Combining wet papermaking, thermal carbonization, and double activation, the new strategy enables the in-situ transformation of fibrillated pulp fibers into cellulose-derived activated carbon fused with carbon fibers (CFs). The resulting ACFPs are characteristic of high specific surface area (808–1106 m2/g), high conductivity (1640–1786 S/m), prominent tensile strength (4.6–6.4 MPa), and flexible processability. Furthermore, the ACFP exhibits maximum specific capacitance of 48.8F/cm3 (or 165F/g) based on the whole electrode and possesses superior cycling stability. Moreover, electroactive materials are readily loaded onto the ACFPs to enhance the capacitance further. In the ACFPs, the cellulose-derived activated carbon is primarily responsible for capacitive energy storage, while CFs serve as a highly functional network due to their low thermal expansion coefficient and high electrical conductivity. Overall, this work provides a novel strategy for manufacturing scalable, cost-effective paper-based electrode materials with broad application prospects in energy storage.

Development and performance evaluation of wood-pulp/glass fibre hybrid composites as core materials for vacuum insulation panels

Thermal insulation is regarded as one of the key technologies to combat ever-increasing energy consumption. An efficient method to develop innovative and cost-effective core materials for vacuum insulation panels (VIPs) is proposed. The materials are natural and sustainable wood pulp fibre doped with various amounts of glass fibre as a reinforcing phase to create a hybrid multi-level network composite core material through the conventional wet papermaking process. The basic characteristics of both wood pulp fibre and glass fibre are studied, and the effect of glass fibre on the textural properties and thermal insulation performance of the composite core materials of the VIPs is investigated. The results showed that all core materials achieved an uniform dispersion of fibres, and the axes of the fibres were randomly in the three-dimensional (3D) network structure. Upon increasing the glass fibre content, the thermal conductivity of the VIPs gradually decreased due to structural changes in the core materials. Both the pore diameter and porosity increased with the glass fibre content. The thermal insulation of the developed VIP was comparable to those of most commercial VIP products. Thermal conductivities of 6.48 and 4.69 mW/(m∙K) were obtained for the VIP with 100% wood pulp fibre and wood-pulp/glass fibre composites (50% mass ratio), respectively. Furthermore, after 365 days of storage, the composite core material with 50% glass fibre maintained a thermal conductivity of 7.42 mW/(m·K) without a getter or desiccant. Even in the accelerated aging condition after 28 days, the increase in the thermal conductivity was less than 5.00 mW/(m·K).

Flexural and shear strength properties of unidirectional carbon fiber reinforced polymer composite interleaved with recycled carbon fiber and short virgin aramid fiber non-woven mats

Carbon fiber reinforced polymer composites (CFRPs) are one of the most widely used composite types and wastes associated with them (CFRPs) get generated through either their manufacturing or end-of-service-life. Predominately due to environmental concerns and governmental regulations, recycling these CFRPs is needed and to make use of the recycled carbon fibers (rCFs), a wet paper-making technique was used to convert the rCFs into a 60 g/m2non-woven mat. For comparison purposes, the same technique was used to convert short virgin aramid fibers (vAFs) into a 60 g/m 2 non-woven mat. Each mat was sandwiched with two resin films and then interleaved with 12-ply unidirectional (UD) prepreg tapes (carbon/epoxy). The assemblage was molded into composite laminates using a vacuum bagging assisted compression molding technique, and the samples for the tests were cut using a waterjet machine accordingly. Compared with the control, the results indicate an increment in the flexural modulus, and the specific flexural modulus for the CFRPs with non-woven mats: the flexural modulus increased by approximately 8.2% and 12.0% for the CFRP with rCF and vAF mats, respectively; the specific flexural modulus increased around 9.5% and 13.3%, respectively for the CFRP with rCF and vAF mats. On the other hand, the shear strength approximately decreased by 6.4% and 6.0% for the CFRP with rCF and vAF mats, respectively. The negative shear strength performances of the composite laminates with non-woven mats reflected on their flexural strength performances: the flexural strength increased about 1.1% and decreased by approximately 7.9% for the CFRP with vAF and rCF mats, respectively. To resolve the negative shear strength performances, it is recommended that the surfaces of the mats be treated with a coupling agent to improve their interfacial adhesions.

Barium titanate dielectric regulation improved output performance of paper-based triboelectric nanogenerator

As a new energy conversion device that can convert mechanical energy into electrical energy, triboelectric nanogenerator has attracted extensive attention since its invention. However, its environmental performance is limited because the raw materials are mostly synthetic polymer materials. Using green and environmentally friendly cellulose materials to prepare triboelectric nanogenerators is one of the important ways to solve the above problems. In this study, cellulose/barium titanate composite paper is prepared by using bamboo cellulose and barium carbonate (BaTiO<sub>3</sub>) as raw materials and combining wet papermaking and doping modification. The paper based triboelectric nanogenerator (C/BT-TENG) is constructed by using the cellulose/barium titanate composite paper as a positive friction layer. The results show that the addition of BaTiO<sub>3</sub> significantly improves the relative dielectric constant of the composite paper, and the output performance of C/BT-TENG increases with the augment of BaTiO<sub>3</sub> doping amount. When the doping amount is 4%, the open-circuit voltage and short-circuit current of C/BT-TENG reach the maximum values of 118.5 V and 13.51 µA, respectively, which are 51.3% and 41.2% higher than when pure cellulose paper is used as the positive friction layer. The mechanism of dielectric regulation to improve the C/BT-TENG output performance is analyzed by the modeling method. In addition, the C/BT-TENG has a good output performance and operation stability. When the load resistance is 5 MΩ, the maximum output power density of C/BT-TENG reaches 0.36 W/m<sup>2</sup>, simplying a good application prospect.

Co3O4 Nanoneedle Array Grown on Carbon Fiber Paper for Air Cathodes towards Flexible and Rechargeable Zn-Air Batteries.

An economical and efficient method is developed for preparing flexible cathodes. In this work, a dense mesoporous Co3O4 layer was first hydrothermally grown in situ on the surface of chopped carbon fibers (CFs), and then carbon fiber paper (Co3O4/CP) was prepared by a wet papermaking process as a flexible zinc-air battery (ZAB). The high-performance air cathode utilizes the high specific surface area of a single chopped carbon fiber, which is conducive to the deposition and adhesion of the Co3O4 layer. Through the wet papermaking process, Co3O4/CP has ultra-thin, high mechanical stability and excellent electrical conductivity. In addition, the assembled ZAB exhibits relatively excellent electrochemical performance, with a continuous cycle of more than 180 times at a current density of 2 mA·cm−2. The zinc-air battery can maintain a close fit and work stably and efficiently even under high bending conditions. This process of combining single carbon fibers to prepare ultra-thin, high-density, high-conductivity carbon fiber paper through a papermaking process has huge application potential in the field of flexible wearables.

High-performance para-aramid paper strengthened by ultrafine fiber pulp of polyphenylene sulfide

Owing to its excellent heat resistance, lightness, insulation, and mechanical properties, aramid paper has been widely used in aerospace, rail transit, military, and other high-tech areas. With the rapid development of modern industries, para-aramid paper-based materials have become the development direction and trend of the specialty paper industry. In this study, para-aramid chopped fibers/polyphenylene sulfide (ACFs/PPS) composite paper sheets were fabricated by modern wet papermaking. The tensile strength, tensile index, and tear index of the hot-pressed ACFs/PPS composite paper sheets were substantially improved, reaching 103.5 MPa, 80.9 N m/g, and 119.1 mN m2/g under optimal speed of hot-pressing roller (0.2 m/min), hot-pressing temperature (310 °C), hot-pressing pressure (0.2 MPa), and ACFs content (70 wt%). The mechanical properties of hot-pressed ACF/PPS composite paper were markedly superior. Besides, the dielectric constant of the composite paper remained stable even when the temperature reached 100 °C. Briefly stated, ACFs/PPS composite paper exhibits desirable mechanical performance, thermostability, high breakdown strength, and low dielectric constant, delivering great potentials in the high-tech areas.