DESC:TECHNICAL FIELD
[0001] The present disclosure relates, in general, to a net, and more specifically, relates to nets with braided twine to provide high strength and bite resistance.

BACKGROUND
[0002] The following description of the related art is intended to provide background information pertaining to the field of disclosure. This section may include certain aspects of the art that may be related to various features of the present disclosure. However, it should be appreciated that this section is used only to enhance the understanding of the reader with respect to the present disclosure, and not as an admission of the prior art.
[0003] In the field of fish production in marine aquaculture, the net used in fish farming or aquaculture needs to fulfil stringent requirements. These requirements are associated with high strength in the combination of low weight and high durability under harsh conditions. Various nets have been developed to meet the above requirements. However, there are various issues with existing nets. The nets in an aqueous environment are more susceptible to undesired growth of organisms such as algae, seaweed, and so on. Moreover, the existing net suffers from poor tensile strength and low bite resistance.
[0004] Therefore, there is a need in the art for a net configuration, which overcomes the above-mentioned and other limitations of existing approaches.

OBJECTS OF THE PRESENT DISCLOSURE
[0005] An object of the present disclosure relates, in general, to a net, and more specifically, relates to nets with braided twine to provide high strength and bite resistance.
[0006] Another object of the present disclosure is to provide a net structure that provides high tensile strength.
[0007] Another object of the present disclosure is to provide a net structure having composite rods that may be light in weight and have high strength.
[0008] Another object of the present disclosure is to provide a net structure having composite rods that are extremely hard to cut, thereby providing protection against predators that try to bite the net.
[0009] Yet another object of the present disclosure is to provide a net structure with high bite resistance.

SUMMARY
[0010] The present disclosure relates in general, to a net, and more specifically, relates to nets with braided twine to provide high strength and bite resistance. The main objective of the present disclosure is to overcome the drawback, limitations, and shortcomings of the existing net structure and solution, by providing a net structure with high strength and bite resistance. The net structure includes an outer shell and an inner core. The outer shell includes one or more polymer yarns, whereas the inner core includes one or more composite fibre rods, a polymer monofilament, and a polymer multifilament.
[0011] The present disclosure provides a system for forming a rigid net cage structure for aquaculture, the system includes a creel adapted to release a bunch of yarns placed on the creel. A twister is coupled to the creel to twist the bunch of yarns in the uniform circular diameter of yarn bunch. A resin treatment tank is coupled to the twister, where the twisted bunches of yarns are passed through the resin treatment tank and penetrate a resin solution in the resin treatment tank. A mould coupled to the resin treatment tank, the mould having a curing zone for evaporation of solvent from the resin solution. A winder coupled to the mould and pultrude resin encapsulated yarn to form the rigid net cage structure, the rigid net cage structure can include an outer shell having one or more polymer yarns and an inner core having a composite fibre rod, where the composite fibre rod can include a combination of a polymer monofilament, a polymer multifilament, and a resin, thereby providing high tensile strength and bite resistance.
[0012] The polymer multifilament having tenacity double that of the polymer monofilament, wherein the polymer multifilament having tenacity at least 8 grams per denier, the denier of the multifilament ranges from 2 denier per filament to 100 denier per filament. The polymer multifilament having the elongation half of the polymer monofilament. The polymer multifilament in the composite fibre rod is selected from a group comprising a combination of Aramid, ultra high molecular weight Polyethylene, liquid crustal polymer (LCP), polybenzyloate (PBO), carbon fibres, and glass fibres.
[0013] The polymer monofilament having tenacity at least 4 grams per denier, wherein the denier of the monofilament ranges from 1000 denier per filament to 10,000 denier per filament. The polymer monofilament in the composite fibre rod is selected from a group comprising polyolefins, polyesters, and amides.
[0014] Further, the resin in the composite fibre rod is selected from the polymeric group comprising polyolefins, imides, amides, esters, and urethanes, rubbers or mixture, wherein the resin solution is in form of aqueous/water based on the dispersion form or organic solvent-based resin. Moreover, the composite fibre rods have a diameter ranging from 0.1 mm to 5.0 mm, wherein the composite fibre rod have a specific gravity of greater than or equal to 1 gm/cm3.
[0015] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The following drawings form part of the present specification and are included to further illustrate aspects of the present disclosure. The disclosure may be better understood by reference to the drawings in combination with the detailed description of the specific embodiments presented herein.
[0017] FIG. 1 illustrates an exemplary schematic representation of process flow for preparing composite fibre rod from different yarn, in accordance with embodiments of the present disclosure.
[0018] FIG. 2 illustrates a schematic view of the conversion of a bunch of yarns into composite fibre rod, in accordance with an embodiment of the present disclosure.
[0019] FIG. 3 illustrates a flow chart for preparing composite fibre rods, in accordance with an embodiment of the present disclosure.

DETAILED DESCRIPTION
[0020] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. If the specification states a component or feature “may”, “can”, “could”, or “might” be included or have a characteristic, that particular component or feature is not required to be included or have the characteristic.
[0021] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[0022] The present disclosure relates, to a net, and more specifically, relates to nets with braided twine to provide high strength and bite resistance. The present disclosure provides a net structure with high strength and bite resistance. The net includes an outer shell and an inner core. The outer shell includes one or more polymer yarns, whereas the inner core includes one or more composite fibre rods (interchangeably referred to as composite rods) and at least one of a polymer monofilament and a polymer multifilament. The composite fibre rods are a highly crosslinked thermoset matrix formed by pulling bundles of polymer fibers through the wet resin, followed by bringing the bundles into the desired form by extruding the saturated fibre bundle through a die to form a composite rod.
[0023] In an embodiment, the composite rod may be made of resin-impregnated fibres using a pultrusion method. The resin-impregnated fibres may include any or a combination of para-aramid, Ultra high molecular weight Polyethylene (UHMWPE) fibreglass, liquid crystal polymer (LCP), polybenzyloate (PBO), carbon fibers, and the likes. In a preferred embodiment, the composite rod may be made of para-aramid for example the rod comprising 70% Aramid fibres and 30% modified acrylate resin cured through the baking process.
[0024] In an embodiment, the composite rods may be light in weight and have high strength. The composite rods may have a higher density – for example – greater than 1g/cm3. The composite rods are extremely hard to cut, thereby providing protection against predators that try to bite the net.
[0025] In an exemplary embodiment, the composite fibre rods may have polymer content – at least 40%. The polymer fibres in the composite rods may have a dry tenacity of greater than or equal to 6 grams per denier.
[0026] In an exemplary embodiment, the composite fibre rods may have an elongation at a break of 0.6 to 6%. The composite fibre rods may have a tensile modulus of greater than or equal to 2500 kilogram-force per square millimetre. The composite fibre rods may have a diameter ranging from 0.2 mm to 2.0 mm. The composite fibre rod may have a specific gravity of greater than or equal to 1 gm/cm3.
[0027] The present disclosure provides a method and system for preparing composite fibre rods for high strength and bite resistance netting. The high strength netting comprising the core with salient nature that is called composite fibre rod refers to a core of polymer yarn encapsulated or surrounded or impregnated by a polymer with additives, wherein the core of composite fibre rod of polymer yarns provides the strength and cut resistance with additives provides the functionality.
[0028] The composite fibre rod is prepared with the specialized process where a bunch of polymer yarn is passed through a solution or resin or binding agents, ensuring it resin or solution or binding agents get penetrated, impregnated or core shelled to a bunch of yarn to make compact structure and formation of the yarn-based rod. In other words, the impregnation, process increases the binding energy of the polymer yarn which is nothing but the pultrusion process. Thus, the formation of yarn-based rods with resin or binding agents can easily form bonding with the core polymer yarns, when the core polymer yarn is treated with a formulation contained in the treatment tank and then pass through by heated mould and curing chamber in twisted nature. In this manner, the composite fibre rod structure of the twine core is achieved. The present disclosure can be described in enabling detail in the following examples, which may represent more than one embodiment of the present disclosure.
[0029] The advantages achieved by the net structure of the present disclosure can be clear from the embodiments provided herein. The present disclosure provides a net structure with high strength and bite resistance, where the net includes a braided twine and in-turn braided net. The net may be configured as knotted net or knotless net or a rope. The braided twine and in-turn braided net are made of the pultruded composite rod. In other words, the net is made of composite fibre rods produced using a pultrusion process, which can be used for the construction of cage structures for aquaculture or fishing nets. The description of terms and features related to the present disclosure shall be clear from the embodiments that are illustrated and described; however, the invention is not limited to these embodiments only. Numerous modifications, changes, variations, substitutions, and equivalents of the embodiments are possible within the scope of the present disclosure. Additionally, the invention can include other embodiments that are within the scope of the claims but are not described in detail with respect to the following description.
[0030] FIG. 1 illustrates an exemplary schematic representation of process flow for preparing composite fibre rods from different yarn, in accordance with embodiments of the present disclosure.
[0031] Referring to FIG.1, a system for preparing the composite fibre rod, system 100 can include creel 102, yarn twister 104, impregnation tank 106, mould 108 and winder 110. The polymer yarn bobbins are mounted on the creel 102. The system 100 may include a yarn bobbin, yarn tensioner and the likes, where the yarn tensioner provides uniform flow/release of yarns 200 shown in FIG. 2 from creel 102 to the twister 104. The yarn twister 104 coupled to the creel 102, and the twister 104 adapted to twist the bunch of yarns 200 in the uniform circular diameter of the yarn bunch. The yarn twister 104 is adapted to make the yarns in a circular rod-like structure.
[0032] The system 100 may include resin treatment tank 106, where the resin solution or binding agent gets filled in the resin treatment/ impregnation tank 106. The twisted bunches of yarn 200 are passed through and soak or deposited or penetrate the resin solution in the resin treatment/ impregnation tank 106. The system 100 may include the mould 108 fitted at the center of the system. The mould 108 may include a heating element, which as curing zone for evaporation of solvent from the resin.
[0033] The winder 110 coupled to the mould 108, the winder 110 adapted to pultrude resin encapsulated yarn to form the net structure 112 (also interchangeably referred to as rigid net cage structure 112, herein) where the net structure 112 can include an outer shell having one or more polymer yarns 200 (also referred to as bunch of yarns, herein) and an inner core having a composite fibre rod 202, the composite fibre rod can include a combination of a polymer monofilament, a polymer multifilament, and a resin.
[0034] In an embodiment, the polymer may be selected from a group or polymeric backbone like amide, imides and polyolefin, liquid crystal polymer (LCP), polybenzyloate (PBO), carbon fibers, polyester, polyether ether ketone (PEEK), polyethylene terephthalate (PET), single or bunch or mixture of all. The polymer multifilament having tenacity double that of the polymer monofilament, wherein the polymer multifilament having tenacity at least 8 grams per denier, the denier of the multifilament ranges from 2 denier per filament to 100 denier per filament. The polymer multifilament having the elongation half of the polymer monofilament. The polymer multifilament in the composite fibre rod 202 is selected from a group including a combination of Aramid, Ultra high molecular weight Polyethylene, liquid crystal polymer (LCP), polybenzyloate (PBO), carbon fibres, and glass fibres. The polymer monofilament in the composite fibre rod 202 is selected from a group comprising polyolefins, polyesters, and amides. The polymer monofilament having tenacity at least 4 grams per denier, wherein the denier of the monofilament ranges from 1000 denier per filament to 10,000 denier per filament.
[0035] The pultrusion process is initiated, where desired yarn bobbins are placed on the creel 102 and all yarns get pulled out from each bobbin and made into one bunch of yarn 200 shown in FIG. 2. The bunch of yarn 200 gets twisted with the twister 104, which converts the bunch of yarn 200 into the uniform circular diameter of the yarn bunch.
[0036] In an embodiment, the twisting of yarn is carried out with different turns per meter (TPM) depending upon the type of yarn. Generally, 25 to 120 tpm is used for twisting, but not limiting to this.
[0037] In an embodiment, system 100 includes resin treatment tank 106, which may be made of metal, plastic, and the like. The impregnation tank 106 serves the role of the resin solution or the binding agent gets filled. The twisted bunches of yarn 200 are passed through and soak or deposited or penetrate the resin solution in the resin treatment/ impregnation tank 106. The resin solution may be in form of aqueous/water based where is in the dispersion or emulsion form and organic solvent-based resin where the binder is in form of dissolved nature in the solvent. The binding solution or resin may be from any polymeric group like polyolefins, imides, amides, esters, and urethanes, rubbers, and the like. The resin solution is in form of aqueous/water-based in the dispersion form or organic solvent-based resin.
[0038] In an embodiment, resin encapsulated or impregnated bunch of yarn pultruded out through mould 108 with the help of the winder 110. The impregnated bunch of yarn passes through moulds 108, which have a circular mould with a heating element. While passing the bunch of impregnated yarns through mould 108 the excess resin comes off from the bunch and during passing with heated mould solvent get evaporated and finally achieved the circular rod-like structure which is stiff, compact but flexible. The mould temperature ranges from 50 to 100°C depending upon the resin to be used and the mould diameter ranges from 0.5 to 5mm.
[0039] In an embodiment, the final composite fibre rod 202 winds on the bobbins with winder 110, which is located next to mould 108. The winder 110 acts as the puller of the yarn for the preparation of the rod. The prepared composite rod 202 is the key component for the net with high strength and bite resistance. The composite fibre rod 202 act as the core of the twine and cover braided yarn made up of an outer shell comprising one or more polymer yarns, which have the same tenacity and elongation % or higher the tenacity lower the elongation or lower the tenacity higher the elongation as yarn properties. The outer shell is made up of monofilaments or multifilament or in combination thereof. The composite fibre rods 202 have a diameter ranging from 0.1 mm to 5.0 mm, wherein the composite fibre rod 202 have a specific gravity of greater than or equal to 1 gm/cm3.
[0040] The cover shell yarn may contain a different group of polymers like polyolefins, amides, imides, polyesters, and the like. The present disclosure provides a method and system for preparing composite fibre rods. The polymer yarn is passed through a quenching process that increases the surface energy of the yarn. The polymer yarn is then passed through the treatment tank 106 containing a specific formulation containing additives. As a result, the additives can easily form bonding with the polymer yarn at the outer surface of the yarn forming the shell of core-shell yarn. In this manner, the core-shell structure of yarn is achieved.
[0041] FIG. 2 illustrates a schematic view of the conversion of a bunch of yarns into composite fibre rods, in accordance with an embodiment of the present disclosure. The bunch of yarns 200 can include the outer shell having one or more polymer yarns and the inner core having the composite fibre rod 202, where the composite fibre rod 202 can include a combination of the polymer monofilament, the polymer multifilament, and the resin.
[0042] Thus, the present invention overcomes the drawbacks, shortcomings, and limitations associated with existing solutions, and provides the net structure 112 that provides high tensile strength, and high bite resistance. The net structure 112 having composite rods 202 may be light in weight and have high strength. The composite rods 202 are extremely hard to cut, thereby providing protection against predators that try to bite the net.
[0043] FIG. 3 illustrates a flow chart for preparing composite fibre rods, in accordance with an embodiment of the present disclosure. Referring to FIG. 3, method 300 for preparing composite fibre rods, the method can include at block 302, uniform flow/release of the bunch of yarns from the creel to the twister. At block 304, the bunch of yarn is twisted in the twister in the uniform circular diameter of the yarn bunch, the twister coupled to the creel. At block 306, the twisted bunches of yarn are passed and penetrate the resin solution in the resin treatment tank. The resin treatment tank is coupled to the twister.
[0044] At block 308, the mould having a curing zone is provided for evaporation of solvent from the resin solution, and the mould is coupled to the resin treatment tank. At block 310, the resin encapsulated yarn is pultruded by the winder to form the rigid net cage structure, and the winder is coupled to the mould. The rigid net cage structure can include an outer shell having one or more polymer yarns and an inner core having a composite fibre rod, the composite fibre rod can include a combination of the polymer monofilament, the polymer multifilament, and the resin.
[0045] It will be apparent to those skilled in the art that the net structure 112 of the disclosure may be provided using some or all of the mentioned features and components without departing from the scope of the present disclosure. While various embodiments of the present disclosure have been illustrated and described herein, it will be clear that the disclosure is not limited to these embodiments only. Numerous modifications, changes, variations, substitutions, and equivalents will be apparent to those skilled in the art, without departing from the spirit and scope of the disclosure, as described in the claims.

ADVANTAGES OF THE PRESENT INVENTION
[0046] The present invention provides a net structure that provides high tensile strength.
[0047] The present invention provides a net structure with high bite resistance.
[0048] The present invention provides a net structure having composite rods that may be light in weight and have high strength.
[0049] The present invention provides a net structure having composite rods that are extremely hard to cut, thereby providing protection against predators that try to bite the net.
,CLAIMS:1. A rigid net cage structure (112) for aquaculture, the rigid net cage structure comprising:
an outer shell having a bunch of yarns (200); and
an inner core having a composite fibre rod (202), the composite fibre rod comprises a combination of a polymer monofilament, a polymer multifilament, and a resin.
2. The rigid net cage structure as claimed in claim 1, wherein the polymer multifilament having tenacity double that of the polymer monofilament, wherein the polymer multifilament having tenacity at least 8 grams per denier, and the denier of the polymer multifilament ranges from 2 denier per filament to 100 denier per filament.
3. The rigid net cage structure as claimed in claim 1, wherein the polymer multifilament having the elongation half of the polymer monofilament.
4. The rigid net cage structure as claimed in claim 1, wherein the polymer multifilament in the composite fibre rod (202) is selected from a group comprising a combination of Aramid, Ultra high molecular weight Polyethylene, liquid crustal polymer (LCP), polybenzyloate (PBO), carbon fibres, and glass fibres.
5. The rigid net cage structure as claimed in claim 1, wherein the polymer monofilament having tenacity at least 4 grams per denier, and the denier of the monofilament ranges from 1000 denier per filament to 10,000 denier per filament.
6. The rigid net cage structure as claimed in claim 1, wherein the polymer monofilament in the composite fibre rod (202) is selected from a group comprising polyolefins, polyesters, and amides.
7. The rigid net cage structure as claimed in claim 1, wherein the resin in the composite fibre rod (202) is selected from polymeric group comprising polyolefins, imides, amides, esters, and urethanes, rubbers or mixture, wherein the resin solution is in form of aqueous/water based in the dispersion form, emulsion form or organic solvent-based resin.
8. The rigid net cage structure as claimed in claim 1, wherein the composite fibre rods (202) have a diameter ranging from 0.1 mm to 5.0 mm, wherein the composite fibre rod have a specific gravity of greater than or equal to 1 gm/cm3.
9. A method (300) for forming rigid net cage structure for aquaculture, the method comprising:
releasing (302), from a creel, a bunch of yarns;
twisting (304), by a twister, the bunch of yarns in the uniform circular diameter of yarn bunch, the twister coupled to the creel;
passing (306), in a resin treatment tank coupled to the twister, the twisted bunches of yarns and penetrating a resin solution in the resin treatment tank;
providing (308) a mould having a curing zone for evaporation of solvent from the resin solution, the mould coupled to the resin treatment tank;
pultruding (310), by a winder, resin encapsulated yarn to form rigid net cage structure, the winder coupled to the mould, the rigid net cage structure comprising:
an outer shell having the bunch of yarns; and
an inner core having a composite fibre rod, the composite fibre rod comprises a combination of a polymer monofilament, a polymer multifilament, and a resin.
10. A system (100) for forming rigid net cage structure for aquaculture, the system comprising:
a creel (102) adapted to release a bunch of yarns (200);
a twister (104) coupled to the creel (102), the twister adapted to twist the bunch of yarns (200) in the uniform circular diameter of the yarn bunch;
a resin treatment tank (106) coupled to the twister (104), the twisted bunches of yarns are passed through the resin treatment tank and penetrate a resin solution in the resin treatment tank;
a mould (108) coupled to the resin treatment tank, the mould having a curing zone for evaporation of solvent from the resin solution; and
a winder (110) coupled to the mould (108), the winder (110) adapted to pultrude resin encapsulated yarn to form the rigid net cage structure, the rigid net cage structure comprising:
an outer shell having the bunch of yarns; and
an inner core having a composite fibre rod, the composite fibre rod comprises a combination of a polymer monofilament, a polymer multifilament, and a resin.