576 results about "Fiber layer" patented technology

A method for predicting unsteady filtering resistance of a dry type dust removal system comprises the following steps: constructing a loading fiber layer filtering resistance model by utilizing the pressure loss of a fiber collecting body; constructing a relation model between the resistance on the cleaning fiber and the resistance acting on the loaded fiber trapping body; constructing a relation model among the diameter change rate of the fiber capturing body, the filtering efficiency and the filtering time parameter; the influence of particle deposition non-uniformity is eliminated through an integral method, and a loading fiber layer filtering resistance model is solved; according to the Darcy law, constructing a relation model among the filtering resistance, the dust layer thickness and the dust layer permeability coefficient when the dust-containing airflow flows through the dust layer; a dust layer filtering resistance model is constructed and solved through the equivalent relation between the deposited dust mass and the captured dust mass; and based on the fiber layer filtration resistance model and the dust layer filtration resistance model, obtaining an unsteady state filtration resistance prediction model of the dry dust removal system. According to the method, the accuracy and practicability of unsteady filtering resistance prediction can be improved.

A vehicular compartment sound proofing structure includes a partition member 12 that partitions the vehicular compartment, a sound absorbing layer 14 having spaces therein, an air impermeable layer 30 made of air impermeable material, and a compressed fiber layer 32A mainly formed of a compressed mass of fibers. Connection strength between the compressed fiber layer 32A and the air impermeable layer 30 is lower than connection strength between the air impermeable layer 30 and the sound absorbing layer 14. Accordingly, antiresonance arises between resonance due to the resonance transmission and resonance by stretching of the sound absorbing layer 14 (refer to 10A). This improves insertion loss in the middle frequency band and soundproofing performance with respect to sound in the middle frequency band is improved.

A filter media comprises a first fiber layer and a second fiber layer positioned downstream of the first fiber layer. The first fiber layer has a first geometric mean fiber diameter of less than 1 μm such that the geometric standard deviation of fiber diameter is greater than 2. The second fiber layer has a second geometric mean fiber diameter of less than 1 μm such that the geometric standard deviation of fiber diameter is less than 2.

The invention discloses a carbon fiber prepreg, a preparation method thereof and a carbon fiber composite material, and relates to the technical field of advanced material compounding. The carbon fiber prepreg comprises a carbon fiber layer, a first resin matrix and a second resin matrix, the carbon fiber layer is coated with the first resin matrix, and gaps in the carbon fiber layer are filled with the first resin matrix; the first resin matrix is coated with the second resin matrix, and the second resin matrix comprises toughening particles; carbon fiber monofilaments of the carbon fiber layer have preset diameters which are larger than or equal to a preset threshold value. The carbon fiber composite material prepared from the carbon fiber prepreg has excellent compression performance, and the impact resistance, durability and other performance of the composite material can be effectively improved.

The invention discloses a high-toughness high-temperature curing epoxy resin prepreg for automatic fiber placement and a preparation method of the high-toughness high-temperature curing epoxy resin prepreg, and belongs to the technical field of resin-based composite materials. The whole high-toughness high-temperature curing epoxy resin prepreg for automatic fiber placement is of a layer structure and is formed by sequentially compounding a high-viscosity surface layer adhesive film, a high-toughness high-temperature curing epoxy resin layer adhesive film and a reinforced fiber layer by adopting a hot melt adhesive film method. According to the high-toughness high-temperature cured epoxy resin prepreg, the toughness is greatly improved, the long storage period can be guaranteed, the viscidity maintaining time is long, the outstanding comprehensive performance is achieved, and the manufacturability use requirement of automatic fiber placement prepreg can be met.

A surface layer main body comprises a rapid infiltration layer, a connecting layer, a guiding and absorbing layer and a liquid sealing layer which are sequentially arranged from top to bottom, and fibers of the rapid infiltration layer are interwoven and arranged to form a plurality of tiny channels and pore networks, so that rapid penetration and transmission of liquid are facilitated; the connecting layer is formed by melting and bonding the first fiber layer and the second fiber layer during hot pressing and plays a role in connecting and bonding the absorption guiding layer and the rapid permeation layer, the absorption guiding layer is of a double-layer fiber web structure, liquid permeates into an upper-layer fiber web and is guided in the length direction of the upper-layer fiber web through the flow guiding grooves, and the rapid permeation layer is formed by the rapid permeation layer. The liquid seal layer is made of fine denier fibers, the fine denier fibers are small in pore size and permeate towards the direction of the lower layer fiber web, under the same thickness and volume, pores of the lower layer fiber web are few, liquid can rapidly penetrate through the lower layer fiber web, and the permeation speed of the liquid is increased, the liquid seal layer is composed of fine denier fibers, the fiber pores are small, and under the action of the pore effect and gravity, the liquid seal layer can permeate towards the lower layer fiber web. And the liquid is not easy to reversely seep towards the rapid seeping layer along the liquid sealing layer.

The present invention discloses a bionic gradient spiral structure composite laminate and a design and preparation method, belonging to the technical field of composite materials. The composite laminate of the present invention comprises a plurality of fiber spiral units coaxially stacked along the thickness direction; the fiber spiral units are stacked layer by layer through carbon fiber prepreg, and each laid fiber layer is rotated by the same angle compared with the fiber direction of the previous layer, and finally a cumulative rotation of 180° is a unit cycle; different fiber spiral units have different rotation angles. The present invention adjusts the out-of-plane impact damage characteristics and damage distribution of the composite laminate through the synergistic effect of fiber spiral units with different rotation angles, thereby improving the out-of-plane impact resistance of the composite laminate.

The invention provides a silicon carbide fiber-copper composite bonding wire and a preparation method thereof, and relates to the technical field of electronic materials. The preparation method of the silicon carbide fiber-copper composite bonding wire comprises the following steps: pre-plating copper on the surface of silicon carbide fiber to obtain copper-coated silicon carbide fiber; laying copper-coated silicon carbide fibers to obtain a copper-coated silicon carbide fiber layer, then constructing a copper alloy layer on the copper-coated silicon carbide fiber layer by using composite copper powder, then arranging the copper-coated silicon carbide fiber layer on the surface of the copper alloy layer again, and repeating the operation to obtain a composite wire blank in which the copper-coated silicon carbide fiber layers and the copper alloy layers are alternately arranged; and sequentially carrying out hot isostatic pressing treatment, drawing and aging treatment on the composite wire blank to obtain the silicon carbide fiber-copper composite bonding wire. The copper powder further comprises Ag, Hf and Sc, the metal elements can form fine and dispersed second-phase particles in the preparation process, and the strength of the copper bonding wire is remarkably improved through a precipitation strengthening mechanism.

A cover window includes a glass fiber composite layer including a first glass fiber layer and a first glass disposed on a first surface of the glass fiber composite layer. The first glass fiber layer includes unidirectional glass fibers apart from each other and each extending in a first direction, and a modulus of the first glass fiber layer in the first direction is greater than a modulus of the first glass fiber layer in a second direction perpendicular to the first direction.

The utility model discloses a vital sign detection device and a cushion, and belongs to the technical field of signal processing. The device comprises a first contact layer, a sensing optical fiber layer and a second contact layer which are stacked in sequence. The first contact layer and the second contact layer are both used for protecting the sensing optical fiber layer, a first optical fiber sensor is arranged on the sensing optical fiber layer, and the first optical fiber sensor is an optical phase modulation type optical fiber sensor. When a user sits or lies on the device, a vibration signal of the body of the user causes a phase change of light transmitted in the optical fiber, in which case the sensor acquires a first section of light signal, the first section of light signal being used to characterize a light phase change, the light phase change being used to detect a vital sign of a first user to detect a health condition of the first user. The optical phase modulation type optical fiber sensor has the characteristic of high sensitivity, so that the health detection performance of the cushion provided by the utility model is better and more accurate.

The invention discloses a halogen-free low-smoke optical cable communication cable, and relates to the technical field of communication cables, the halogen-free low-smoke optical cable communication cable comprises an optical fiber assembly, a communication assembly is arranged on the outer surface of the optical fiber assembly, and a chemical protection assembly is arranged on the outer surface of the communication assembly. According to the halogen-free low-smoke optical cable communication cable, in order to enhance the mechanical strength of the cable, the protective sleeve can improve the impact resistance of the cable, the thin steel layer can provide mechanical strength for the cable, the armor layer on the outer layer is used for resisting external corrosion, and the smoke suppression layer additionally arranged between the armor layer and the thin steel layer can reduce smoke generated when the cable burns; the glass fiber layer is an important reinforcing and protecting structure in the cable, the buffer layer prevents the optical fibers from being broken and the conductors from being deformed, and when the cable is subjected to external impact force, lubricating oil stored in an oil tank flows into the surface of the armor layer and permeates into the outer surface of the thin steel layer through the smoke suppression layer. The cable has an effective protection effect on mechanical strength resistant components in the cable, and the outermost wear-resistant layer depends on certain rigidity and toughness.

The invention discloses an I-type initial fracture toughness analytical calculation method considering a fiber layering angle, and belongs to the technical field of composite material fracture mechanics, and the I-type initial fracture toughness analytical calculation method comprises the following steps: carrying out a DCB experiment; calculating I-type interlayer fracture toughness-crack length data according to data obtained by the experiment, and drawing an R curve; observing a crack propagation path of the sample in the experiment, and establishing a crack propagation mechanism model according to an observation result; according to the obtained crack propagation mechanism model, establishing an I-type layering initial fracture toughness analytical calculation method considering the fiber layering angle influence; and predicting the initial fracture toughness of the samples with different fiber laying layer angles. According to the I-type initial fracture toughness analytical calculation method considering the fiber laying layer angle, a new prediction tool based on a physical mechanism is provided for fracture analysis of a composite material, so that fracture behaviors of the material under different laying layer configurations can be predicted more accurately in a design stage, and the analysis accuracy of the I-type initial fracture toughness is improved. Therefore, the influence of experimental errors is avoided.

The invention relates to a laser fuse additive manufacturing preparation method of a memory alloy fiber implanted aluminum alloy self-healing material. The method comprises the following steps: selecting an Al-Mg-Sc aluminum alloy as a base material; the Ti-20Ta-10Zr memory alloy fibers are subjected to surface acid etching treatment; 1.0% of tensile prestrain is applied to the treated memory alloy fibers; the memory alloy fibers are woven into a twill woven structure; a laser coaxial wire feeding method is adopted, aluminum alloy layers are alternately deposited, memory alloy fiber layers are laid, and the multi-layer composite material is prepared. The prepared composite material has excellent mechanical property and self-healing function, and when the composite material is damaged by external force, crack closing and material self-healing are achieved through the shape memory effect of the memory alloy fibers. The method is simple in process, and the prepared material is stable in performance and suitable for industrial production and has wide application prospects in the fields of aerospace, automobile industry and the like.

The present application relates to the field of disposable sanitary products, and particularly relates to an absorbent core with composite non-woven fabric, comprising a body, the body comprising an upper fiber layer, a lower fiber layer and an intermediate fiber layer clamped between the upper fiber layer and the lower fiber layer, the upper fiber layer, the lower fiber layer and the intermediate fiber layer are bonded to each other to form a bonding part, the area of the bonding part accounts for 5-100% of the area of the body, the fiber thickness of the upper fiber layer and / or the lower fiber layer is 4-12D, the fiber thickness of the intermediate fiber layer is 0.6-2D, the upper fiber layer and the lower fiber layer are inlaid with high molecular water-absorbing particles, the average pore of the upper fiber layer and the lower fiber layer is greater than the average diameter of the high molecular water-absorbing particles, and the average pore of the intermediate fiber layer is smaller than the average diameter of the high molecular water-absorbing particles. The present application solves the technical problem that the high molecular is prone to loss when the absorbent core is made of fluffy non-woven fabric.

The invention relates to the technical field of layered products, in particular to a heat-conducting antibacterial xanthium sibiricum multilayer fiber structure and a preparation method thereof.The preparation method includes the steps that jute fibers, graphene fibers and low-melting-point fibers are evenly mixed, and after carding, lapping and needling treatment, a composite fiber layer is formed; hemp fibers and low-melting-point fibers are evenly mixed, and after carding, lapping and needling treatment, a pressure-bearing fiber layer is formed; the heat-insulation antibacterial fiber layer is stacked on the top of the pressure-bearing fiber layer, the composite fiber layer continues to be stacked on the top of the heat-insulation antibacterial fiber layer, and the heat-conduction antibacterial xanthium sibiricum multi-layer fiber structure is prepared through hot-pressing curing shaping and fine trimming. The multi-layer fiber structure is a layered product composed of the composite fiber layer, the heat-insulation antibacterial fiber layer and the pressure-bearing fiber layer, and has good air permeability, antibacterial property and excellent heat preservation performance.

The invention relates to a multi-layer glass fiber reinforced plastic production line, a production method and multi-layer glass fiber reinforced plastic, and relates to the field of glass fiber reinforced plastic production equipment.The multi-layer glass fiber reinforced plastic production line comprises a bottom film processing unit, a first fiber laying and gluing unit, a composite thickness determining unit, a heating and curing unit and a trimming and cutting unit which are sequentially arranged; the upper layer processing unit is capable of forming a top film gel coat on the top film and / or paving a second fiber layer on the top film and infiltrating a second resin adhesive on the top film and forming a semi-cured state, and the lower layer processing unit is capable of forming a second fiber layer on the top film and infiltrating a second resin adhesive on the top film and forming a semi-cured state. The composite thickness determining unit can lay the second fiber layer on the first fiber layer to form a composite glass fiber reinforced plastic material with a set thickness, and the composite glass fiber reinforced plastic material is heated and cured by the heating and curing unit and trimmed and cut by the trimming and cutting unit to form the composite glass fiber reinforced plastic, so that the production quality of the composite glass fiber reinforced plastic product can be ensured.

The invention discloses a Janus type flexible radiation refrigeration material and a preparation method thereof.The Janus type flexible radiation refrigeration material is characterized in that a modified radiation refrigeration layer and a functional layer are arranged on the upper surface and the lower surface of a substrate fiber layer with specific functional groups, and on one hand, the substrate fiber layer can be subjected to esterification or silanization bonding with the amino silane modified radiation refrigeration layer; the material can be subjected to an esterification reaction with a carboxylation modified functional layer, so that the three-layer material interface is chemically bonded, the bonding force of the interface is effectively improved, the dynamic stability is effectively improved on the basis of ensuring the optical performance and the mechanical flexibility, and the application of the radiation refrigeration material is promoted.

The invention discloses a composite hose structure for fuel gas transmission, and relates to the technical field of fuel gas transmission and distribution equipment, the composite hose structure comprises a dual-mode quick sealing assembly, dual-mode monitoring is formed by an FBG sensor, a phase-sensitive optical time domain reflectometer and a carbon tube composite filament, the FBG sensor can capture fine strain of a reinforced fiber layer in real time, and the phase-sensitive optical time domain reflectometer can capture the fine strain of the reinforced fiber layer in real time; the phase-sensitive optical time domain reflectometer detects and captures stress waves generated by crack propagation in a material through broadband sound waves, early recognition of millimeter-level damage in a pipe is achieved, grids woven by carbon tube composite filaments are utilized, continuity of the grids is monitored in real time through alternating-current impedance measurement, and the detection accuracy of the millimeter-level damage in the pipe is improved. When local grid resistance is increased due to breakage of the reinforced fiber layer, a micro-damage area can be accurately positioned, when leakage occurs, the memory alloy spring receives an electric signal monitored by a dual-mode, then axial thrust is generated to push the outer side of the fluororubber sealing ring, the fluororubber sealing ring expands in the radial direction under the thrust action of the memory alloy spring, and the leakage is prevented. And rapid and effective mechanical hard sealing is realized.

The utility model discloses a composite core mold which comprises a lining layer, a metal reinforcing layer and an outer covering layer which are sequentially connected from inside to outside, the axial length of the metal reinforcing layer is smaller than the axial length of the lining layer and the axial length of the outer covering layer, sealing layers are arranged on the two axial end faces of the metal reinforcing layer respectively, and the inner surfaces of the sealing layers are connected with the outer surface of the lining layer. The outer surface of the sealing layer is connected with the inner surface of the outer covering layer, and the metal reinforcing layer continuously stretches across the heavy load bearing area. The metal reinforcing layer with low cost and high bending modulus is additionally arranged between the two fiber layers, so that compared with a traditional pure fiber core mold, the core mold has the advantages that the bending modulus is higher, the cost is low, the bearing limit is larger, the weight is lighter under the condition of the same bearing performance, and the core mold is easier to transport; meanwhile, the sealing layer is arranged to prevent dissimilar metal pollution, and the winding quality of foil products is guaranteed; by ensuring the roundness of the metal reinforcing layer, the processing efficiency of the outer covering layer is improved, and the process difficulty is reduced.

The invention provides a carbon fiber reinforced silicon carbide brake disc. The carbon fiber reinforced silicon carbide brake disc comprises a long fiber area I, a long fiber area II, a short fiber area III, a long fiber area IV and a long fiber area V. The long fiber area II and the long fiber area IV are the same in component, and the long fiber area I and the long fiber area V are the same in component. Each of the long fiber region I and the long fiber region V comprises one long fiber layer, two long fiber layers,..., Nm long fiber layers, and from the first long fiber layer on the surface to the Nn long fiber layers, the silicon carbide content VSiCn in the Nn long fiber layers is reduced by 1lt along with the increase of the number of layers; n < nlt >; nm. Each long fiber layer in the long fiber area extends from the surface of the brake disc to the inside, the content of silicon carbide in the long fiber layer is gradually reduced, it is guaranteed that the content of silicon carbide in the surface long fiber layer is high, and the brake disc has a good friction coefficient; and the phenomenon that a large amount of residual thermal stress occurs due to different sharp changes of the silicon carbide content of the multi-layer material can be avoided, and the material strength is effectively guaranteed.

Chopped carbon fibers are generally used for reinforcing composite materials, but traditional chopped fibers are not uniformly distributed in a matrix, so that the anisotropy problem is caused; according to the three-dimensional skeleton structure, fibers are arranged in a three-dimensional space through process optimization, traditional two-dimensional stacking is different, and the multi-directional mechanical property of the material is effectively improved; the fibers are arranged along a specific direction by utilizing magnetic field assisted orientation, so that the orientation strength of the composite material is improved; the fiber layers with different orientations are stacked to form a more complex stacked structure; the microstructure of the material is optimized through temperature and pressure dynamic aging process changes in the material forming process; the new process integrates a plurality of innovation points, and the comprehensive performance of the composite material is optimized through fiber pretreatment and three-dimensional orientation arrangement under the assistance of a magnetic field in combination with lamination forming and dynamic aging treatment processes; the process breaks through the bottleneck of anisotropy and interlayer failure of a traditional composite material through the synergistic effect of magnetic field-assisted three-dimensional orientation and dynamic aging, and is suitable for the field of high-added-value new materials.

The invention provides a high electromagnetic shielding color fiber and a preparation method and application thereof. The high electromagnetic shielding color fiber comprises a matrix fiber layer, an optical inert material layer attached to the surface of the matrix fiber layer, and an electromagnetic shielding functional coating attached to the surface of the optical inert material layer. According to the method, the fiber material is subjected to thermal annealing treatment at different temperatures, so that the obtained fiber material presents bright and high-saturation surface colors. And the obtained fiber material has high electromagnetic shielding capability, does not influence the original mechanical properties, can greatly improve the flame retardant property and oxidation resistance of the fiber material, and has good extreme environment service resistance.

An improved composite material used to connect, strengthen and / or repair concrete. The improved composite material includes a first fiber system including at least one fiber layer. Each fiber layer includes a plurality of fibers. The binding material can be used to optionally secure together the plurality of fibers. The improved composite material is positioned and secured in a slot cut in a concrete structure. The top edge of the improved composite material includes a recess portion.

The invention relates to the technical field of composite materials, in particular to a hybrid fiber composite material billiard cue. The hybrid fiber composite billiard cue comprises a front support and a rear handle, wherein the front support comprises a first core body, a first fiber layer and a first reinforcing layer, and the first fiber layer and the first reinforcing layer are sequentially stacked on the outer circumferential surface of the first core body; the rear handle is detachably connected with the front support; the rear handle comprises a second core body, and a second fiber layer, a second reinforcing layer and a protective layer which are sequentially stacked on the outer peripheral surface of the second core body; the first reinforcing layer and the second reinforcing layer each comprise a three-dimensional woven structure composed of various fibers. According to the design, the first reinforcing layer and the second reinforcing layer are arranged to be of the three-dimensional woven structure formed by weaving various fibers and are matched with the protective layer, the first fiber layer and the second fiber layer, the light weight and the corrosion resistance are guaranteed, and meanwhile the mechanical performance of the front branch and the rear handle in multiple directions is enhanced; the service life is prolonged; and the use experience is improved.

The embodiment of the invention provides an online detection method, device and equipment for a fiber-wound composite gas cylinder and a medium, and belongs to the technical field of fatigue detection. The method comprises the following steps: acquiring a grating sensing signal of a target gas cylinder in an operation process, wherein the grating sensing signal is acquired by an FBG sensor pre-embedded in a fiber layer of the target gas cylinder; extracting a strain detection signal according to the grating sensing signal; determining a predicted damage area of the target gas cylinder according to the strain detection signal; determining a scanning path according to the predicted damage area, and obtaining ultrasonic detection data through ultrasonic phased array scanning based on the scanning path; and based on the predicted damage area, damage information of the target gas cylinder is determined according to the strain detection signal and / or the ultrasonic detection data, and the damage information comprises a damage position and a damage type. The invention aims to realize the damage state detection of the gas cylinder in the operation process and improve the use safety of the gas cylinder.

The invention discloses a hedgehog-like thorn three-dimensional fiber three-dimensional woven composite material and a preparation method thereof. The composite material comprises at least two resin layers, at least two woven fiber layers and at least one connecting fiber layer, the connecting fiber layer comprises a plurality of strip-shaped attaching fibers; the winding part of the strip-shaped attaching fiber is positioned between the one-way strip-shaped fiber and the one-way fiber; and the non-winding part of the strip-shaped attaching fiber is attached to the other non-winding part of the strip-shaped attaching fiber. The woven fiber layer and the resin layer are of a rigid structure, the connecting fiber layer is of a flexible structure, and the woven fiber layer and the connecting fiber layer cooperate with each other and have excellent performance in the aspects of force bearing, load resistance, bending resistance, specific strength, specific buckling strength and the like. In addition, the one-way ribbon fibers and the one-way fibers are interwoven to form a woven fiber layer; the strip-shaped attaching fibers are interwoven on the one-way fibers of the two woven fiber layers to form the connecting fiber layer, and the strip-shaped attaching fibers are attached to each other, so that the effects of toughening and delaying buckling are achieved.

The utility model relates to the technical field of supporting materials, in particular to a composite material, a supporting plate and electronic equipment, and the composite material comprises at least one first reinforcing fiber layer, at least one second reinforcing fiber layer and a mesophase pitch-based carbon fiber layer arranged between the first reinforcing fiber layer and the second reinforcing fiber layer; wherein the first reinforcing fiber layer is an acrylonitrile-based carbon fiber layer or a pitch-based carbon fiber layer, and the second reinforcing fiber layer is an acrylonitrile-based carbon fiber layer or a pitch-based carbon fiber layer. According to the laminated composite material provided by the invention, the two sides of the high-rigidity mesophase pitch-based carbon fiber layer are respectively connected with the first reinforcing fiber layer and the second reinforcing fiber layer which have high rigidity, so that the thickness and the mass of the composite material can be reduced to meet the light and thin requirements; the composite material also has good heat conduction performance and high rigidity performance.

The present invention relates to the field of fiber composite material parts, and discloses a boom machine, a fiber composite material part, and a production method and production line thereof, the production method comprising: a spiral fiber winding step (S10) of spirally winding a resin-infiltrated fiber yarn onto the outer peripheral surface of a part main body expansion core mold (1) to form a spiral fiber layer (4); a circumferential fiber winding step (S11) in which a circumferential fiber (5) is spirally wound on the outer peripheral surface of the spiral fiber layer to form a circumferential fiber wound layer; and a rigid outer mold mounting and heating curing step (S20), in which the rigid outer mold (2) is mounted so as to surround the circumferential fiber winding layer, heat the spiral fiber layer, and extrude the spiral fiber layer toward the rigid outer mold to cure and shape the spiral fiber layer by expanding the workpiece main body expansion core mold. The production method and the production line are beneficial to improving the production efficiency of the fiber composite material part, and can ensure that the fiber composite material part has better surface quality and mechanical property.

To provide a termite-proof heat insulating material and a termite-proof method capable of continuously protecting the heat insulating material from termites.SOLUTION: A termite-proofing heat insulating material 2A includes a heat insulating layer 20 having a first surface in contact with a base 1 of a building, a communication layer 30 provided on a second surface of the heat insulating layer 20 opposite to the first surface, and a fiber layer 70 provided on a side of the communication layer 30 opposite to the heat insulating layer 20 and including a nonwoven fabric. The communication layer 30 has a first surface portion, a second surface portion, and a main body portion connecting the first surface portion and the second surface portion, the first surface portion and the second surface portion are formed in a flat plate shape and are disposed at an interval in a thickness direction, and the vertical communication portion 41 is a space formed between the first surface portion and the second surface portion.SELECTED DRAWING: Figure 7

The invention relates to the technical field of civil air defense doors, in particular to a composite material civil air defense door and a manufacturing method thereof.The composite material civil air defense door comprises a door plate assembly, the door plate assembly comprises a panel, a first fiber layer and a filling layer, the panel is arranged on the outer side of the first fiber layer, and the first fiber layer is arranged on the outer side of the filling layer; the panel, the first fiber layer and the filling layer are integrally formed, the reinforcing rib assembly is arranged on the panel and used for reinforcing the panel, the reinforcing rib assembly comprises a second fiber layer and a bonding layer which are arranged in a stacked mode, the second fiber layer comprises one or more of high-strength glass fiber cloth or glass fiber felt, and the bonding layer is arranged between the second fiber layer and the bonding layer. The weight of the protective air-tight door is reduced by 60%, the product structure is simple, the production efficiency is improved by more than 50%, later transportation and on-site installation of the product are facilitated, and the protective air-tight door has the advantages of good production efficiency and cost.