Vessel made of composite material

 

(57) Abstract:

Usage: in capacitive equipment in contact with corrosive environments, chemical, petrochemical, electronic, textile and other industries. The inventive vessel made of composite material includes a housing in the form of a bearing shell of revolution with a vent, votenum him with a flange, and a removable lid. Corrosion protection of the body made in the form of batch coating, consisting of a formed by winding along the geodesic lines of layers of tape film chemically resistant thermoplastic and reinforcing mesh dry fibrous filler inside of thermoplastic at a given distance in the direction of the bearing shell, with a step layout selected in the range from 4/7 - 3/5 the width of the ribbon of thermoplastic sealing layer of rubber and woven material from polycaproamide fiber binding between a thermoplastic and a layer of rubber compound. Batch coating is connected with the bearing shell from the side of the sealing layer of the rubber with an adhesive composition. In the groove removable cover around the perimeter is made of two symmetric about its median line of the ledge. And the applications level which is equal to the value of the lug grooves, and two Central steps of forming miuwestepn space of the groove of the additional cavity with a volume greater than the total volume of the annular projections. 3 C.p. f-crystals, 5 Il.

The invention relates to chemical engineering and can be used in capacitive equipment in contact with corrosive environments of various chemical, petrochemical, electronic, textile and related industries.

Known shell structures made of composite materials, consisting of protective and load-bearing layers, with the implementation of the latter in the form of a mesh reinforcement of the impregnated binder of roving (U.S. patent N 2633414, CL NCI 23-290, 1953).

These designs are technologically complex production due to the need to ensure the tightness of the external base layer and, consequently, high costs, and, in addition, such membranes have a low life.

Also known shell of nonmetals with performance mesh base layer with a normalization step pickup reinforcing wire harnesses (1,5-2,0, width of the loom), and in contact with the protective layer of the inner surface of the base layer is porous (Overcklocking fillers in zones of bends to the surface of the protective layer and between themselves at the intersection of harness, but without filling polymer binding sites between adjacent coils.

The disadvantage of this design is the insight of the shell for the working environment, progettogiovani through the protective layer, part of which is discharged through the porous inner surface of the base layer and drainage channels, and described ecologicall due to entering the work area the production of corrosive environments and destruction of the carrier material layer.

The closest technical solution to the present invention is a vessel made of composite material (USSR Author's certificate N 1089344, CL F 17 C 1/00, 1984), comprising a housing in the form of a shell of revolution with pin hole, flange, botany in the pole hole, a removable lid with o-ring, formed on a lateral outer surface of the torus.

The disadvantages of this vessel made of composite material are low corrosion resistance and, as a consequence, small operating life in terms of chemically aggressive environments, high complexity test the tightness of the roof bolt, due to the necessity of filling in the control environment just inside affilirovannogo sealing ring, tore part which mates with the inner side surfaces of the pole flange. Moreover, the nominal dimensions maximum diameter of the cap, the diameter of the pin holes of the shell and the inner diameter of the flange is made equal, due to the need for the Assembly works of the artists are highly qualified with great production skills.

The aim of the invention is to improve the manufacturability and durability of the vessel, as well as simplifying and improving the reliability of control of its integrity.

The objective is achieved by the fact that the vessel made of composite material, comprising a housing in the form of a bearing shell of revolution with a vent and votenum him with a flange, a removable lid, the groove which has a flexible profiled sealing ring in the groove, provided with a corrosion-protection housing made in the form of batch coating, consisting of a formed by winding along the geodesic lines of layers of winding tapes film chemically resistant thermoplastic and reinforcing mesh dry fibrous filler inside of thermoplastic at a given distance in the direction of the bearing shell with a step pickup, vibes polycaproamide twisted fiber, fastening between thermoplastic and the rubber layer of the mixture, and the batch coating is connected with the bearing shell from the side of the sealing layer of the rubber with an adhesive composition, while in the groove removable cover around its entire perimeter is made of two symmetrical relative to the median line of the groove of the annular protrusion, and a flexible sealing ring is made corresponding to a stepped groove, two peripheral speed which is equal to the value of the lug grooves and the two Central steps of forming megavitamin space of the groove of the additional cavity with a volume greater than the total volume of the annular projections.

In Fig. 1 shows a General view of the receptacle of a composite material with a partially longitudinal axial section; Fig. 2 - node I in Fig. 1; Fig. 3 - node II in Fig. 1; Fi g 4 - site III in Fig. 3 (enlarged image) of Fig. 5 is a diagram of the winding along the geodesic lines of dry fibrous filler, forming a mesh.

The vessel 1 made of composite material includes a housing 2 in the form of carrier plastic shell rotation 3 with pin hole 4 and votenum steel flange 5, a removable metal cover 6, a plastic support is n corrosion protection 11 of the housing 2, performed in a batch coating 12.

The structure of the wall of the housing 2 with batch corrosion-resistant coating 12 includes:

formed by winding along the geodesic lines of the layers of tape film chemically resistant thermoplastic 13;

mesh is formed by winding along the geodesic lines of bundles of dry fibrous filler 14;

the woven material of polycaproamide twisted fiber 15;

the sealing layer of rubber compound 16;

the adhesive composition 17 connecting the sealing layer 16 with the wall of the bearing shell 3.

Reinforcing mesh 14 is placed inside thermoplastic 13 at a given distance " a '" in the direction of the bearing shell 3, constituting 2/3 or 3/4 of the total thickness of thermoplastic is " ", i.e. we have the equality '= 2/3 or ' =3/4 .

thermoplastic tape 13 and the wiring reinforcing filler 14 is wound on technological mandrel, a forming cavity of the bearing shell 3. The support skirt 7 is made of plastic of the same brand as the material of the bearing shell 3 and a protective coating is not supplied.

Removable cover 6 is attached captive bolts to the flange 5, motonobu in the pin hole of the bearing shell of rotation 3, lined on internally the cancel cover work surfaces - shell 3, the flange 5, the drain pipe 9 of the cover.

In Fig. 3, 4 shows that the removable cover 6 is provided with a special sealing groove (not labeled) , formed under the form of a flexible sealing ring 18 (strip), which is part of the overall corrosion protection 11.

In the groove is made of two symmetrical relative to the median line of the groove of the annular protrusion 19 a value of "h", also symmetrical peripheral in relation to the lugs 19 of the annular depression and meeuwissen space in the form of an annular groove depth slightly less than the value of "h", in which one through hole 20. In the flexible sealing ring 18 is made of stepped groove 21, the two peripheral notches 22 which is equal to the value of the lug groove "h", and the two Central stage 23 is formed with megavitamin space of the groove of the additional cavity 24 to be greater than the total volume of the annular projections 19. A flexible sealing ring 18 is of corrosion-resistant material, for example from cyclododecanone rubber according to GOST 7338-77 or rubber type IRP coated with a suspension layer of polyethylene or Teflon, and has a flat circular trailing portion 25 (in the form of "Blimber, who covers the combined functions abdulrosa gaskets and lining covering the inner working surface of the cover. The jumper between the Central steps 23 of the sealing ring 18 are evenly spaced around the perimeter jumpers hole 27, one of which is coaxial with the hole 20 in the cover 6. The hole 20 has a fitting 28 connected to the system supply of the control gas 29, provided with a pressure gauge 30 and a gas cylinder 31.

Operation of the proposed vessel is as follows.

Through technological fittings the removable cover 6 into the vessel served to be a consumable storage or transportation of the chemical solution. For lifting the brackets 10 of the vessel 1 is placed on the storage pad or on the vehicle and is fixed on the supporting skirt 7 and the brackets 10. The emptying of the vessel is made by filing in the appropriate fitting removable cover 6 inert gas displacer (when picking vessel siphon pipe) or by opening drain valve, install by the output of the drain pipe 11, is used to remove the technological washing solutions after washing the inner surface of the vessel before the next gas station (in the case of transportation of highly pure chemicals). For protection from the penetrating vessel pollution and for yemei cover 6, before transporting vessel on it is mounted quick-release protective cover 8 removed later before the next filling of the vessel chemical products.

For the primary control of tightness of the vessel after manufacture and during its periodic technical inspection in the hole 20 of the removable cover 6 is installed fitting 28 connected through the supply system control gas 29 to the container with the last 31. Advance portion of gas into the cavity 24 and the hole 27, and then checked the pressure of the control gas pressure gauge 30. In the case of the constancy of the specified pressure connection removable cover 6 with the flange 5 is sealed, otherwise it is necessary to additionally tighten the cover bolts to the flange or replace the flexible sealing ring 18.

To check the tightness of the roof bolt enough to bring to the fitting portion 28 of the control gas from the cylinder volume 31 2-3 l (depending on the size of cap 6), which within a few seconds to fill the cavity 24 and passing through the holes 27, the space between the deformed during tightening of bolts of fastening of a cover 6 to the flange 5 working ledges of the sealing ring 18. These items is the dimension of the butt cap 6 with the flange 5 by deformation of the material of the sealing ring 18. Since the volume of the cavity 24 more of the total volume of the projections 19, with any degree of compression of the elastic seal ring 18 in the cavity 24 will remain through passage of a small volume for receiving the control gas around the perimeter of the annular cavity 24, which will ensure the reliability of monitoring the integrity of the entire roof bolt. Thus, a leak test of the proposed vessel can be carried out without filling its internal volume, and submitting the small control portion of gas from the cylinder 31 in the maturity 24 and checking the pressure gauge 30, which will take no more than 15-20 minutes

The proposed vessel made of composite material can be used for transportation of chemical products, and therefore he should have a high cyclic durability, and therefore ensuring the continuity of all layers in a batch of plastic and high-quality connection interfaces are very important. Continuity thermoplastic portion of the cover 13 is provided by a small thickness of the wound tape, the force of their pull (the winding density) and the right choice of mode reflow heat treatment.

Film chemically resistant thermoplastic rescreen in the belt width "h" and Niam. Next on the first thermoplastic sublayer packet cover 12 is wound along the geodesic lines of the mesh of the wire harnesses covered binder fiber filler 14, reinforcing the specified sublayer thermoplastic thickness " '". Step pickup filler 14 in the cylindrical part of the vessel is the value of "t" is selected in the range:

t = ... b , where t is the step pickup filler reinforcing mesh;

b - width of a single tape film chemically resistant thermoplastic.

On top of the supporting sub-layer thermoplastic thickness "' " mesh of fibrous filler 14 is wound ndcleu such as tapes thermoplastic film 13 of a width "b" residual thickness "(-') ", component of the residual part of the total thickness of thermoplastic is " ". In this case, the term "sublayer" and "ndcleu" are used in reference to a reinforcing mesh filler 14.

As a result of the heat treatment process of chemically resistant thermoplastic 13 will be a mutual fusion including thermoplastic mass of dry filler 14 and, thus, the equality '=2/3 or '=3/4 in the finished product will be respected, since the thickness of the bundles of dry filler 14 is very small - not more than 0.3 mm Spolernost dry filler provides the greatest adhesion in a pair of connected materials thermoplastic filler, in fact, the latter is embedded in a solid after heating the layer of thermoplastic.

The angle of the pickup filler 14 in the cylindrical part of the winding mandrel, respectively, of the bearing shell 3 with respect to its generatrix is advisable to select equal to or slightly greater than the angle of winding of the tape film chemically resistant thermoplastic 13 calculated by the formula:

y= arcsin whereythe angle of winding of the tape in the cylindrical part of the mandrel;

Rois the radius of the cylindrical part of the mandrel;

R1is the radius of the lower axle clamps.

Accordingly, the current angle of the pickup tapes and fibers at the end (usually torispherical) sections of the winding mandrel to form the value:

i= arcsin whereithe current angle of the pickup;

Rithe current radius of the end portion of the mandrel.

For products belonoha type (winding "cocoon") angle stacking reinforcing and other fillers (harnesses, ribbon, leaf) standardized for the cylindrical part of the cylinder, because in this angle is constant (y=const), in contrast to the variable "i".

The proximity of the corners of the winding tape film chemically resistant thermoplastic 13 and podkreplyaet thickness " '" by practically spatial parallel winding of raw materials chemically resistant lining the inner surface of the vessel body and a reinforcing its core (in contact with the working environment) capacitive part of the net monolayer of fibrous filler. In addition, the underestimation of the angle of winding of the reinforcement relative to the angle of winding ribbons of thermoplastic will lead to the exit of the reinforcing filler for the outer contour of the flange 5, framing the pin hole 4, and inflated to the lack of supporting antisodomy branches in preventivas the area of the wound thermoplastic lining shell, because the pole reversal of the fiber in this case it will occur at a diameter greater than the maximum diameter of the flange 5 along which a pair of chemical-resistant protective coating of the bearing shell 3 and the flange 5.

Practical experience of operation of capacitive equipment Plastpolymer internal surfaces in highly corrosive environments shows that to ensure the health products for the normative terms of service and the required purity of the stored and(or) transported aggressive chemicals thickness of the inner layer of corrosion protection should be 3-5 mm (depending on the concentration and temperature of the working environment, as well as the kind of the used lining material). In addition, we can note that thicker (operating margin) thermoplastic lining tend to accumulate relaxational.

The design of the vessel of thermoplastic composite material part of a batch coating its inner surface is made mechanically) from monolayers tape spiral cross-winding "cocoon" film of thermoplastic, which can be used polyethylene, polypropylene, polyamide, modified polytetrafluoroethylene, polyethylenepolyamine, pet.

Also note that when used as a chemically resistant thermoplastic fluorinated films they should be modified with special additives that reduce the temperature of fusion, so that the latter does not exceed the temperature of curing of the composite bearing shell of the vessel (for fiberglass and epoxy - 160-180aboutC). Others listed thermoplastics have a melting point significantly below the figures, and can be used in the state of industrial supplies. The optimum thickness range of the film tapes of thermoplastics for winding corrosion-resistant shells of revolution is in the range of 0.5-0.9 mm - will then be ensured and the integrity of the winding, and the continuity of the material obtained.

As a concrete example produced by type RBMN or RWMN according to GOST 17139-79 and organogel type GSVM technical conditions TL6-06-I-87, moreover, the use of organonitriles preferable because they are more durable that when a grid (mesh) the wound is important, because the nodes linking gusts of fibrous filler will continue to reduce its adhesion to thermoplastic. To avoid increasing the weight and cost of the vessel and to reduce shrinkage phenomena during operation ndcleu thermoplastic should be more subtle, the most optimal execution of naglaa thickness (-') will be winding the tape in a single layer.

For a production implementation of the proposed vessel made of composite material suitable only paired layers of tape thermoplastic film formed helically cross-wound, allowing to obtain a shell of rotation of the balloon of the type with a Central cylindrical portion and a curved bottoms. And, therefore, placement of reinforcing mesh dry fibrous filler within a chemically resistant thermoplastic in the batch surface of the composite vessel must comply with the observance of one of the relations: '=2/3 or '=3/4 .

In the following sequence of coating a batch of the coating on the filament winding on the dry filler - the layer of thermoplastic tapes.

Option 2.

Three layers of thermoplastic tapes - reticular layer of the dry filler - layer tape of thermoplastic.

Wrap the ribbon of thermoplastic 13 have a width "b" component 30-35 mm and click on the one hand, from the condition of ensuring sufficient strength of the material in the filament winding tension (geodesic winding is possible only strained fillers), and, on the other hand, from the condition of ensuring the stacking of tapes in the area of thickening around the pin holes (for wide tape it will not stay on the geodesic line due to the large curvature of the bottom of the vessel).

As an example of the processing layer winding polyethylene tapes, you can specify the following mode thermal effects:

temperature rise up to 124aboutC for 2-3 h;

the extract at a temperature of 124aboutC for 4-5 h;

temperature rise up to 128aboutC for 0.5 h;

normalization if 128aboutC for 0.5 h (to avoid possible shrinkage in addition to reinforcing the reinforcement of thermoplastic mesh of dry fibrous filler 14);

cooling to 90aboutWith at least 3 hours;

cooling to 60aboutWith at least 6 hours;

free (basole combined (interleaved geodetic and circular layers of fillings) winding the calculated wall thickness of the bearing shell 3 is purely circular woven winding the prepreg support skirt 7, why to a primary winding mandrel under the bearing shell 3 is supplied removable cylindrical part with pretorium bevel under the lower reinforcing the bottom of the vessel annular skirt thickening. Diagram of the reinforcement carrier membrane 3 fillers is determined by the strength calculation is performed based on the particular operating conditions of the vessel. Recommended materials: glass roving or organogel epoxy. The outer diameter of the winding carrier shell 3 of the Central cylindrical section equal to the diameter of the cylindrical portion of the removable node winding mandrel under a basic skirt 7 and after filling any fibrous or ribbon filler, bevel removable portion of the mandrel to the outer diameter of the winding carrier shell is the total winding impregnated with a polymeric binder fabric of the entire height of the housing 2 with additional reinforcement of the cylindrical wall section of the bearing shell 3 and the formation of a single monolithic composite capacitive shell and the base skirt of the vessel. Joint heat treatment batch protective coating 12, the bearing shell 3 and the supporting skirt 7 to the General regime of melting-solidification will receive one-piece integral construction with durable scapbooking known fibers, for example, nylon elastic fabric TU-17 RSFSR 62-5969-78, well penetrate into the connecting polymers during their joint heat treatment, provides a bond to thermoplastic 13 with a rubber mixture 16.

As the rubber compound 16, sealing the bearing shell 3 and providing proof internal coating from exposure to working environments and, accordingly, the purity of the latter, it is advisable to use corrosion-resistant rubber type:

brand 2566 under hydrochloric, sulfuric, phosphoric, nitric acid, caustic soda, sulphuric anhydride;

brand 4476 - under hydrochloric, sulphuric, nitric acid, caustic potash;

brand 1976 under hydrochloric and phosphoric acid, caustic soda;

brand IRP-1025 - under hydrochloric acid;

brand 1726 under phosphoric and nitric acid;

brand 51-2185 under hydrochloric acid;

brand 52-2058 under sulfuric acid;

brands IRP-1310-1, 51-1619, 51-2110 under superfactory acid.

As the connector 17 rubber compound 16 with the wall of the bearing shell 3 can be applied film or liquid adhesives of the type VK-3A on the EAST 92-0948-74 providing quality glue rubber to winding plastics.

P R I m m e R. was designed and fabricated experimental the flax - the roving - polyethylene - nylon fabric - rubber blend adhesive composition. The materials of manufacture of the bearing shell and the bearing skirt vessel: glass roving, fiberglass, organobromine epoxy. Groove removable covers and rubber o-ring model of the vessel is profiled in accordance with the proposed. Control the tightness of the model took no more than 10 minutes (without preparatory works for the installation of the supply system in the area of joint control of gas).

Laboratory studies cut from the wall of the experimental vessel samples showed the continuity of articulation of all layers of corrosion protection and the strength of its connection with the main load-bearing wall of the shell.

The use of the proposed vessel made of composite material can improve the manufacturability due to the transition to celimontana the execution of the main part of the corrosion protection of the body, to increase its durability and strength, as well as to simplify the control of containment vessel and reliability of the integrity of the vessel and the reliability of the leak test cap shutter vessel.

1. VESSEL made OF COMPOSITE Materinu cover, in the groove which has a flexible profiled sealing ring, characterized in that it is provided with a corrosion-protection housing made in the form of batch coating, consisting of a formed by winding along the geodesic lines of layers of tape film chemically resistant thermoplastic and reinforcing mesh dry fibrous filler inside of thermoplastic at a given distance in the direction of the bearing shell, with a step layout selected in the range from 4/7 to 3/5 of the width of the ribbon of thermoplastic sealing layer of rubber and woven material from polycaproamide twisted fiber binding between a thermoplastic and a layer of rubber compound, and batch coating is connected with the bearing shell from the side of the sealing layer of the rubber with an adhesive composition, while in the groove removable cover around its entire perimeter is made of two symmetrical relative to the median line of the groove of the annular protrusion, and a flexible sealing ring is made corresponding to a stepped groove, two peripheral speed which is equal to the value of the lug grooves and the two Central steps of forming megavitamin space grooves for more Palast maruosa mesh dry fibrous filler is placed inside thermoplastic at a distance, constituting 2/3 of the total thickness of thermoplastic.

3. Vessel under item 1, characterized in that the reinforcing mesh dry fibrous filler is placed inside thermoplastic at a distance of 3/4 of the total thickness of thermoplastic.

4. Vessel under item 1, characterized in that the flexible sealing ring removable covers for protective lining the inner surface of the cover is made of corrosion-resistant material and provided with a flat circular trailing part.

 

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16 cl, 21 dwg

FIELD: chemistry.

SUBSTANCE: carbon fibre reinforcement frame for producing carbon-carbon composite material, which is resistant to oxidation and erosion under high temperature and pressure, for example, for the tip of a rocket head, comprises a central unidirectional cylindrical bundle of a given diameter made of carbon fibre bonded with binder - aqueous polyvinyl alcohol solution, on which, like an arbour, a cocoon of carbon fibre is wound by honeycomb winding. The workpiece for making a reinforcement frame of carbon fibre is in the form of a unidirectional cylindrical bundle of a given diameter arranged centrally along an axis and made of carbon fibre which is bonded with aqueous polyvinyl alcohol, on which, at a distance equal to the height of a workpiece of the tip of a rocket head by ring winding, polar barriers are applied in the form of a spherical surface made of carbon fibre soaked with the binder - aqueous polyvinyl alcohol solution. The method of making a reinforcement frame from carbon fibre for producing carbon-carbon composite material, which is resistant to oxidation and erosion under high temperature and pressure, is carried out in the following sequence: winding a cocoon of carbon fibre soaked with aqueous polyvinyl alcohol on a workpiece, having a bundle of unidirectional carbon fibre with two polar barriers by honeycomb winding, as on an arbour. After drying the frame and cutting off the ends of the cocoon with polar barriers, the frame is taken for saturation with a carbon matrix.

EFFECT: making a high-density reinforcement frame which, after saturation with a carbon matrix, is used to produce carbon-carbon heat-protective material, which is resistant to erosion under the effect of high temperatures and pressure, for example, the tip of a rocket head.

4 cl, 4 dwg

Rotor blade and fan // 2592156

FIELD: machine building.

SUBSTANCE: rotor blade comprises rotor blade housing and rotor blade root section, made integral with rotor blade housing. Housing of rotor blade is formed by stacking of multiple composite sheets, each of which is made of fibres and matrix resin, and includes multiple first sets of composite sheets and multiple second groups of composite sheets located in direction of thickness of blade. Each first group of composite sheets comprises multiple composite sheets laid one on another from centre of thickness of blade towards blade back and which differ from each other by orientation angle of fibres. Each second group of composite sheets comprises one or more composite sheets laid one on another from centre of thickness of blade towards blade pressure surface and which differ from each other by orientation angle of fibres. Layouts of multiple composite sheets in first and in second group of composite sheets are identical. Resultant direction of orientation of fibres directions in multiple composite sheets in each of first group of composite sheets and second group of composite sheets is inclined to rear edge at acute angle from direction of span, passing from central end of rotor blade housing to upper end of rotor blade housing. Another invention of group refers to fan, which includes rotor blade installed in mounting groove of its disk.

EFFECT: group of inventions provides resistance to vibrations of rotor blades at reduction of weight.

4 cl, 14 dwg

FIELD: space.

SUBSTANCE: invention can be used in aerospace industry, in production of sports goods and leisure products. Prepreg with formability comprises a base material from a stitched carbon fibre. Multiple sheet materials 1 are arranged in layers and then stitched and joined together in a stitched base material using stitch thread 2 interlaced when passing through sheet materials 1. Each sheet material 1 is formed by arranging lines 11 of the carbon fibre parallel to each other. Direction of arranging lines 11 of the carbon fibre of each sheet material 1 forms an angle ranging from ±30° to ±60° to the direction of movement of interlacing stitch thread 2. Degree of the stitched base material tension in its longitudinal direction in case when a specific load per inch of width of the stitched base material is applied in the direction of movement of interlacing stitch thread 2 is equal to or below 4 % when the load is equal to 5N and is equal to or higher than 10 % when the load is 25N. Prepreg is formed by impregnation of the base material from the stitched carbon fiber, in which multiple sheet materials 1 are arranged in layers and then stitched and joined together using stitch thread 2 interlaced when passing through sheet materials 1 by a thermosetting resin within the range from 30 wt% to 50 wt%.

EFFECT: invention enables to obtain a base material from a stitched carbon fibre, which has high shape stability and moldability and provides for convenience in processing a wet prepreg, facilitates production of a 3D shape.

9 cl, 6 dwg, 1 tbl, 4 ex

FIELD: textile, paper.

SUBSTANCE: sheet includes the first nonwoven web and the second nonwoven web, each of them is the nonwoven web in which the mesh made from the long fibers and it is bonded by thermally connected sections by fusion. Each of the long fibers is the monocomponent fiber, made in the process of uniform spinning of melted thermoplastic polymer. The sections connected by fusion forming the sheet, forms by partial connection by fusion of the first nonwoven web and the second nonwoven web, and each section connected by fusion forming the sheet has on the inner side of its contour the through hole in which the outer peripheral edge has the shape similar to the shape of the contour. The first nonwoven web and the second nonwoven web are connected in the section between the contour of sections connected by fusion forming the sheet and the outer peripheral edge of the through hole.

EFFECT: invention allows to reduce the liquid residue in the absorbent product and reduce its rewetting.

26 cl, 7 dwg, 1 tbl, 3 ex

FIELD: technological processes.

SUBSTANCE: composite radius aggregate contains two or more radius laminated materials. Each radius laminated material comprises a laminated material of composite layers stacked one on top of another, made with a predetermined radius. The predetermined radial orientation of the stacked composite layers coincides with the radial orientation of adjacent stacked composite layers of the composite structure surrounding said two or more radius laminated materials. Each radius laminated material is cut in such a way that at least one side thereof is aligned adjacent to the others to form a composite radius aggregate having a shape corresponding to the area of the radius aggregate of the composite structure.

EFFECT: reducing the cracking of the composite radius aggregate under the action of residual thermal stresses.

15 cl, 17 dwg

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