Camouflage net with improved thermal disruption

Abstract

The current invention relates to a camouflage net wherein said camouflage net is coated with a thickening chemical comprising ethoxylated alcohol, glycerol and reaction products thereof. The coating is preferably provided in a camouflage pattern, and the camouflage net is preferably a 2D camouflage net. The invention also relates to a method for producing a camouflage net providing camouflage in both the visible and thermal spectrum. The method involves providing a base fabric, coating the fabric with a thickening chemical in a camouflage pattern, and dying a camouflage pattern onto the base fabric.

Description

[0001] CAMOUFLAGE NET WITH IMPROVED THERMAL DISRUPTION

[0002] FIELD OF THE INVENTION

[0003] The field of the invention is related to camouflage technology, specifically to the development and manufacture of camouflage nets. 2D camouflage nets traditionally lack concealment in the thermal range. Present invention aims to improve the concealment of such camouflage nets in the thermal region.

[0004] BACKGROUND

[0005] Camouflage nets are used to conceal soldiers and vehicles from observation. The effectiveness of these nets is based on their ability to disrupt the camouflage pattern on visible, NIR and SWIR regions. However, achieving disruption in the thermal region is not easily attained.

[0006] Traditionally, camouflage nets have consisted of a net, comprising a plurality of intersecting net strands, to which a garnish is attached. The garnish is a coated fabric which may have visual and near infrared properties selected to match the terrain where the camouflage net is to be used. The coated fabric may be incised to create a three dimensional (3D) leafy effect, for example.

[0007] In the latter case, the garnish can be applied to the net in patches to create the look of vegetation from a threat distance or as a complete cover (100%). The garnish may also have a printed or spray painted pattern if required. In addition, radar reflecting / absorbing properties can also be incorporated in the garnish if desired.

[0008] The nets may also comprise low emissivity fabrics which may be strategically placed to cover hot areas of a concealed object in order to produce a multi-spectral camouflage system.

[0009] The net mesh dimension in these traditional 3D nets is typically in the region of 75 mm square. This can make the nets difficult to deploy since the mesh may snag on protruding corners of the object to be concealed. Traditional 3D camouflage nets achieve thermal camouflage through the fabric structure and air exchange. The net's openings allow convective air exchange, preventing solar loading.

[0010] However, in 2D nets which typically have substantially lower mesh dimensions, the thermal image between 3-5 pm and or 8-12 pm wavelength looks generally flat / plain in color when detected by a thermal camera, which can reduce the essential concealment. This is not the case in 3D camouflage nets because the air exchange is irregular due to the leaf structure that enables a sort of irregular thermal look which enables better thermal camouflage. Therefore, there is a need for a solution that provides better thermal camouflage for 2D nets.

[0011] SUMMARY OF THE INVENTION

[0012] The invention pertains to a camouflage net in accordance with claim 1 and method for its production in accordance with claim 14. The net is coated with a thickening chemical, comprising ethoxylated alcohol and glycerol or reaction products thereof, which creates a bloated surface over the warp knitted base fabric, enabling various thermal patterns and disruption in thermal vision. The coating thickness is irregular and provided in a camouflage pattern.

[0013] The invention improves the net's thermal camouflage capabilities and durability, and reduces its water absorbency and gloss, making it more effective in various environments and against thermal detection systems. The method involves providing a base fabric, coating it with a thickening chemical in a camouflage pattern, and dying a camouflage pattern onto the base fabric. The thickening chemical can be applied using rotary screens with different concentrations of the chemical.

[0014] The bloating paste chemical, when applied during the printing process, preferably creates a bloated surface over the warp knitted base of the camouflage net. This bloated surface, depending on the concentration of the bloating paste chemical used, may result in a thicker surface locally on the net. The temperature variations across the net, caused by this thicker surface, are preferably responsible for the disruption in the thermal vision, leading to improved concealment in the thermal region.

[0015] The bloating paste chemical can be applied in various concentrations, each concentration potentially creating a different level of temperature variation and therefore a different level of disruption in the thermal vision.

[0016] DETAILED DESCRIPTION OF THE INVENTION

[0017] The term "Camouflage net" refers in the present invention to a net-like material used for concealment by creating a disruption in the visual, NIR, SWIR, and thermal regions. The term "coating" refers to coating or print. In the context of present invention, the term "coating" is mainly used to refer to a layer of a thickening chemical applied onto the camouflage net. This layer of thickening agent causes thickening or swelling of said camouflage net, thereby creating an area in which the thickness of said camouflage net is increased.

[0018] The term "thickening chemical" or "bloating paste" refers to a composition that when applied to a textile base, results in a local increase in thickness or swelling of the textile, preferably under the influence of water or moisture. The bloating paste chemical is preferably formulated to create localized variation in heat capacity, moisture retention, or thermal conductivity, thereby inducing a disrupted thermal signature under ambient heating conditions. Preferably, the composition is a mixture of ethoxylated alcohol, glycerol, and reaction products thereof, that is used to create an increased thickness or swelling of the camouflage net.

[0019] The term "thickness” refers to the thickness of the camouflage net in its entirety. Due to the thickening agent coated onto the camouflage net, the camouflage net swells locally resulting in an increased thickness. The thickness is measured in millimeters (mm).

[0020] The term "camouflage pattern" refers to a design that is intended to conceal the object it is applied to by blending with the surrounding environment.

[0021] The term "2D camouflage net" refers to a two-dimensional net that provides concealment in the visual and NIR regions; which has relatively small mesh sizes. In contrast, the term "2D camouflage net" generally refers to camouflage nets with a large mesh size, which provide depth to the camouflage net.

[0022] The term "net mesh dimension" refers to the size of the individual openings in the net, measured in square millimeters (mm2).

[0023] The term "base fabric" refers to the primary material from which the camouflage net is made.

[0024] The term "specific weight" refers to the weight of the camouflage net per unit area, measured in grams per square meter (g / m2), in accordance with ISO 3801.

[0025] The term "water absorbency" refers to the amount of water that the camouflage net can absorb, expressed as a percentage of the net's weight, as measured by ASTM D570. The term "self extinguishing" refers to the property of the camouflage net to cease burning once the source of heat is removed, as determined by ISO 6941.

[0026] The term "gloss" refers to the shininess or reflective quality of the camouflage net, measured in gloss units (GU) according to ISO 2813 at a 85° geometry.

[0027] The term "uniform" in the context of the thermal spectrum refers to the appearance of the camouflage net when viewed in specific wavelength ranges, specifically 3 to 5 pm and 8 to 12 pm, under the influence of ambient heating. In these conditions, a regular net with fine meshes or a blanket will display a generally uniform image, typically due to its largely uniform temperature image.

[0028] The term "rotary screen" refers to a cylindrical screen used to apply dyes and prints to textile materials. The term "concentration of thickening chemical" refers to the amount of the thickening chemical present in the coating solution, expressed as a percentage by weight or expressed as the weight of the thickening agent per weight of solvent.

[0029] In an aspect, the invention relates to a camouflage net with enhanced thermal concealment properties. This is achieved through the application of a bloating paste chemical during the printing of the nets, which creates a bloated or swollen area on the warp knitted base.

[0030] This bloated or swollen area enables the creation of various thermal patterns and helps create disruption in thermal vision, thereby enhancing the camouflage effect of the net in thermal regions. The bloating paste chemical creates a thicker surface locally on the net, resulting in temperature variations across the net. This prevents the net from emitting a uniform thermal image, providing a superior level of concealment for soldiers or vehicles, especially against thermal imaging cameras.

[0031] Bloating paste

[0032] In a preferred embodiment, the bloating paste chemical comprises at least one hygroscopic agent and at least one stabilizing agent. The hygroscopic agent preferably increases local moisture uptake and retention. The stabilizing agent preferably contributes to the viscosity and printability of the bloating composition, and the swellability and stability of the resulting layer.

[0033] In a further preferred embodiment, the bloating composition comprises a plastisol.

[0034] Plastisol refers to a dispersion of thermoplastic polymer particles, preferably polyvinyl chloride (PVC), in a liquid plasticizer. Upon heating, the PVC particles swell and dissolve in the plasticizer, forming a flexible, cohesive film upon cooling. Preferably, the plastisol comprises finely dispersed PVC resins with an average particle size in the range of 0.1 to 5 microns, more preferably in the range of 0.2 to 2 microns, allowing for smooth and controllable gelation during curing. More preferably, the plastisol is plasticized using mineral oil, more preferably a paraffinic or naphthenic mineral oil with low volatility and low polarity. Even more preferably, the plastisol is free of phthalates. The absence of phthalates addresses increasing safety and health concerns for users, more preferably in situations involving frequent handling or use in enclosed or confined environments, and further contributes to compliance with environmental and regulatory standards.

[0035] The addition of plastisol provides a coating with increased durability, greater thermal mass, and improved printability. More preferably, the plastisol exhibits strong adhesion to polymer-based substrates, more preferably warp-knitted synthetic fabrics, thereby improving the overall performance and durability of the camouflage net.

[0036] In a particular preferred embodiment, the bloating paste comprises, more preferably consists of glycerol, ethoxylated alcohol, plastisol preferably derived from PVC and mineral oil, and optionally water, optionally surfactants and optionally additives.

[0037] Hygroscopic agents

[0038] Preferred hygroscopic agents are chosen from the list consisting of: diols, triols, polyethylene glycols (PEGs), polyglycerols, sugar alcohols, multifunctional alcohols, and multifunctional amines or amides, as well as mixtures thereof. These agents are preferably selected based on their ability to retain water, swell polymeric textiles, and increase local heat capacity while exhibiting low volatility and good compatibility with textile processing conditions.

[0039] Preferred diols and triols are selected from the list of: glycerol, propylene glycol, 1,3- butylene glycol, 1,4-butanediol, pentylene glycol, 1,2-hexanediol, caprylyl glycol (1,2-octanediol), dipropylene glycol, tripropylene glycol, and trimethylolpropane. These compounds are typically liquid at room temperature, possess high hygroscopicity, and are compatible with aqueous formulations. Their hydroxyl groups enable interaction with polymeric fibers, enhancing local moisture uptake and thereby increasing the thermal inertia of treated regions. Their low vapor pressure ensures persistence on the textile over time. More preferred, the diol is glycerol. Preferred polyethylene glycols (PEGs) and polyglycerols are selected from the list of: PEG-200, PEG-400, PEG-600, PEG-1000, PEG-1500, PEG-3000, PEG-6000, diglycerol, triglycerol, tetraglycerol, and higher oligomers of glycerol. These materials offer tunable viscosity and hygroscopicity depending on molecular weight. PEGs and polyglycerols are particularly effective at water retention and can act as softeners, humectants, and mild film-formers, contributing to the stability of the bloated coating layer while maintaining flexibility and softness of the fabric.

[0040] Preferred sugar alcohols are selected from the list of: sorbitol, xylitol, mannitol, and erythritol. These compounds are solid polyols with multiple hydroxyl groups, giving them strong water-binding capacity. They are especially effective in increasing moisture buffering within a coating, and are known for their low reactivity and excellent biocompatibility. Their use can promote non-uniform thermal emissivity when distributed unevenly.

[0041] Preferred multifunctional alcohols include: pentaerythritol, trimethylolpropane, and related polyhydroxy compounds. These molecules provide multiple hydroxyl anchor points for interacting with both the fabric and other formulation components, enhancing structural cohesion of the applied layer and prolonging retention of absorbed water.

[0042] Preferred multifunctional amines or amides include: triethanolamine, diethanolamine, and urea. These compounds can complement hygroscopicity with solubilizing, buffering, or thermal stabilizing effects. Urea in particular is known for its strong water-binding properties and ability to modify hydrogen bonding in cellulose or synthetic polymers, potentially enhancing thermal masking.

[0043] Stabilizing agents

[0044] Preferred stabilizing are chosen from the list consisting of: ethoxylated alcohols, alkoxylated surfactants, nonionic surfactants, polyvinyl alcohols (PVA), cellulose derivatives, natural gums, synthetic film-forming polymers, and mixtures thereof. These agents are preferably selected for their ability to control the viscosity, distribution, adherence, and structural integrity of the coating on the textile, as well as their compatibility with agueous formulations and textile printing technigues.

[0045] Preferred ethoxylated and alkoxylated alcohols are selected from the list of: ethoxylated fatty alcohols, preferably C12-C18 ethoxylated fatty alcohols, nonylphenol ethoxylates, octylphenol ethoxylates, lauryl alcohol ethoxylates, branched or linear alkyl polyether alcohols, and ethoxylated castor oil derivatives. These compounds act as nonionic surfactants and softeners, contributing to the stable dispersion of other agents, improving wetting and leveling during application, and forming soft films upon drying. They enable controlled spreading of the paste while resisting rapid flow, which is essential to maintain localized thickened regions in a camouflage pattern.

[0046] Preferred nonionic surfactants include: alkyl polyglucosides, sorbitan esters (Spans), ethoxylated sorbitan esters (Tweens), and block copolymers of ethylene oxide and propylene oxide (Pluronics). These surfactants provide excellent emulsification and dispersion without interfering with dye uptake or thermal coating performance. Their balanced hydrophilic-lipophilic properties help maintain paste stability across varying temperatures and drying rates.

[0047] Preferred polyvinyl alcohols (PVA) are selected from the group of: partially hydrolyzed PVA, fully hydrolyzed PVA, and low to medium molecular weight grades, optionally modified with plasticizers or surfactant moieties. PVA offers film-forming capability, dimensional stability, and moisture responsiveness. It supports the mechanical durability of the swollen region and provides good adhesion to synthetic and natural fibers alike. It also contributes to reduced water wash-out of hygroscopic agents.

[0048] Preferred cellulose derivatives include: hydroxyethyl cellulose (HEC), methyl cellulose (MC), carboxymethyl cellulose (CMC), and hydroxypropyl methyl cellulose (HPMC). These water-soluble polymers provide viscosity control, swelling capability, and are known to form soft, water-retentive gels on textiles. Their compatibility with both natural and synthetic fabrics makes them ideal stabilizers for bloated coatings, especially where a soft touch is desired.

[0049] Preferred natural gums include: xanthan gum, guar gum, locust bean gum, and gum arabic. These biopolymers contribute high water-holding capacity and gel stability at low concentrations. They enable spatial control of coating thickness by forming thixotropic or shear-sensitive networks, and remain compatible with rotary screen application methods.

[0050] The bloating paste chemical may optionally comprise reaction products between the above components, such as glyceryl ethers, polyether esters, or oligomeric condensates, particularly when the paste is subjected to elevated temperatures during application. In a preferred embodiment, the ratio by weight of the hygroscopic agent to the stabilizing in the bloating paste chemical may range from 100: 1 to 1: 100, depending on the desired degree of thermal disruption, pattern definition, and compatibility with the textile substrate. In a preferred embodiment, the weight ratio is between 10: 1 and 1: 10, more preferably between 5: 1 and 1:5, more preferably between 2: 1 and 1 :2, and most preferably between 1.5: 1 and 1 : 1.5. A higher proportion of hygroscopic agent may enhance local heat capacity and moisture retention, resulting in stronger thermal masking effects. Conversely, a higher proportion of stabilizing agent may improve pattern sharpness, coating durability, and dimensional control. The optimal ratio by weight can be selected based on the intended environmental exposure, drying conditions, and mechanical properties of the camouflage net.

[0051] Preferably, the bloating paste chemical is preferably aqueous and may be formulated as a print paste or coating formulation suitable for rotary screen or other patterned application methods.

[0052] The bloating chemical particularly preferably comprises a mixture of glycerol, ethoxylated alcohol and reaction products thereof. More preferably, a mixture of glycerol and ethoxylated alcohol is utilized. More preferably, the bloating chemical or bloating paste consists of an aqueous solution of glycerol, ethoxylated alcohol and reaction products thereof.

[0053] Without being bound by theory, glycerol and ethoxylated alcohol soften yarns and impart humectant properties in polymeric yarns such as polyester and polyamide; increasing their moisture uptake, maintenance and thus content. This both swells the fabric and results in variations in the thermal image of the fabric in ambient conditions; even at relatively low water absorption levels. It should be noted that in particular for polymeric yarns, water absorption and maintenance as well as heat capacity is very low. Small increases in water uptake are believed to have an outsized effect in heat capacity. Furthermore, the softening or conditioning effects of both glycerol and ethoxylated alcohols lead to a different feel, make-up and thickness of the fabric.

[0054] The bloating paste can be printed through rotary screens onto the 2D mesh fabric with a camouflage pattern and various concentrations. The concentration of the bloating paste may vary, and can be adjusted to achieve the desired level of thermal disruption. The concentration of the bloating paste is preferably between 5 wt% and 50 wt%, more preferably between 10 wt% and 45 wt%, more preferably between 15 wt% and 40 wt%, more preferably between 20 wt% and 35 wt%, most preferably between 25 wt% and 30 wt%.

[0055] The size of the bloated surface created by the bloating paste also plays a crucial role in the thermal disruption. The bloated surface preferably increases the thickness of the base fabric with at least 2%, more preferably at least 5%, more preferably at least 10%, more preferably at least 15%, more preferably at least 20%, more preferably at least 25%, more preferably at least 30%, relative to the thickness of the base fabric.

[0056] Preferably, the paste is applied in a manner that results in a non-uniform thickness across the net. This non-uniform thickness helps to disrupt the thermal signature of the net, making it more difficult to detect with thermal imaging equipment. The paste may be applied in a variety of patterns, each pattern resulting in a different thermal signature. The pattern and concentration of the paste application can be varied depending on the specific environment in which the net is to be used.

[0057] In a further embodiment, the bloating paste is applied in a camouflage pattern. Camouflage patterns in this context are understood to be patterns similar to those used to provide concealment in the visible range. However, rather than variations in color, variations in the concentration of bloating chemical can be utilized. This results in an uneven thermal image, providing improved thermal concealment.

[0058] The camouflage pattern of the thermal spectrum, that is to say the camouflage pattern in which the bloating paste is applied does not need to be the same camouflage pattern in the visual spectrum or visual range. The bloating paste is largely translucent and thus has limited impact on the visible range. It is desirable to utilize different camouflage patterns for both the thermal and visible range. This allows the camouflage pattern to be optimized for each respective range and in function of the environment in which the camouflage net will be employed.

[0059] In another embodiment, the camouflage pattern of the thermal spectrum, that is to say the camouflage pattern in which the bloating paste is applied, corresponds at least partially to the camouflage pattern in the visible spectrum of the camouflage net. This can be desirable to reduce printing steps during production. The bloating paste and visible dye can be applied simultaneously, for example utilizing a single rotary screen for each color in the visible range and each concentration of bloating paste for the thermal range. Camouflage patterns typically utilize 3 or 4 different colors including the base color; thus a similar amount of different bloating paste concentrations can be utilized.

[0060] In another embodiment, the bloating paste is applied in varying concentrations resulting in varying thicknesses across the net. This creates a more irregular thermal image, further enhancing the thermal disruption and concealment capabilities of the net. The thickness of the 2D net preferably varies between 0.1 mm and 3 mm, more preferably between 0.2 mm and 2.5 mm, more preferably between 0.3 mm and 2.0 mm, more preferably between 0.3 mm and 1.5 mm. Therefore, the invention provides a novel solution for enhancing the thermal concealment properties of camouflage nets, providing a superior level of concealment against thermal imaging cameras.

[0061] In another embodiment, the thickness of the bloated surface created by the bloating paste chemical may range from 0.5 mm to 3 mm. More preferably, the thickness may range from 0.7 mm to 2.5 mm, more preferably from 0.9 mm to 2 mm, more preferably from 1 mm to 1.5 mm. The thickness of the bloated surface is another factor that influences the effectiveness of the thermal disruption. A thicker bloated surface may result in greater temperature variations across the net, thereby enhancing the disruptive effect.

[0062] The application of the bloating paste chemical is preferably done through rotary screens onto the 2D mesh fabric with a camouflage pattern. This method of application may allow for precise control over the placement and concentration of the bloating paste chemical, leading to a more effective disruption of the thermal vision. The rotary screens, in combination with the bloating paste chemical, can potentially create various thermal patterns on the camouflage net, each pattern providing a different level of concealment in the thermal region.

[0063] In a more preferred embodiment, the bloating paste chemical is applied in concentrations that are optimized for specific environmental conditions. For example, in colder environments, a higher concentration of the bloating paste chemical may be used to create a greater temperature variation and therefore a greater disruption in the thermal vision. In warmer environments, a lower concentration of the bloating paste chemical may be sufficient to achieve the desired level of concealment. This flexibility in the application of the bloating paste chemical allows for the camouflage net to be customized to the specific needs of the user and the specific conditions of the environment. In an embodiment, the camouflage net particularly the base fabric is a knitted or woven fabric. In a more preferred embodiment, the camouflage net is constructed using warp knitted fabrics. This choice of material is not random, but rather a strategic decision based on the desirable properties that warp knitted fabrics offer. The use of warp knitted fabrics for the base of the camouflage net ensures that the net is more robust and durable. This robustness is essential for the net to withstand the harsh conditions of the field, where it may be exposed to various elements such as wind, rain, and rough handling by soldiers. Durability is also vital for the longevity of the net, as it reduces the need for frequent replacements, thereby saving on resources.

[0064] The warp knitted fabric is preferred for its compatibility with the bloating paste chemical. The fabric's structure and properties allow the chemical to be printed onto it in various concentrations, creating a bloated surface over the base. The warp knitted fabric's ability to accommodate this chemical application process makes it an ideal choice for the base of the camouflage net. This is advantageous and in turn results in an improved ability to effectively maintain its thermal camouflaging effect for a longer duration. This is a crucial advantage, as the effectiveness of a camouflage net is heavily dependent on its ability to disrupt thermal vision. A net that loses its thermal camouflaging effect quickly would be of little use in the field. The warp knitted fabric is able to retain the thermal patterns created by the bloating paste chemical for a prolonged period. This ensures that the net remains effective in concealing soldiers and vehicles from thermal cameras.

[0065] In conclusion, the use of warp knitted fabrics for the base of the camouflage net is a preferred embodiment due to its robustness, durability, and ability to maintain the thermal camouflaging effect for a longer duration. These characteristics make it a highly effective material for the construction of camouflage nets.

[0066] In a preferred embodiment, the base fabric for the camouflage net is constructed with materials such as polyester, polyamide, cotton, or mixtures thereof. Among these materials, polyester is more preferably used. This choice of materials contributes to the overall durability and lifespan of the camouflage net. The use of these materials, particularly polyester, relates to the inherent qualities of these materials, such as their resistance to wear and tear, their resilience in varying weather conditions, but also its ability to absorb and swell under the influence of the bloating paste chemical. This ensures the effectiveness of the thermal camouflage over a longer period. Preferably, the base fabric is at least 50% polyester, more preferably at least 70% polyester, more preferably at least 80% polyester, more preferably at least 90% polyester, more preferably 95% polyester, more preferably 97% polyester, more preferably 99% polyester, most preferably 100% polyester in accordance with ISO 1833.

[0067] In a preferred embodiment, the camouflage net has a specific weight between 100 and 500 g / m2as measured according to ISO 3801, more preferably between 200 and 350 g / m2. More preferably, the specific weight is at least 150 g / m2, more preferably at least 175 g / m2, more preferably at least 200 g / m2, more preferably at least 225 g / m2, more preferably at least 250 g / m2. More preferably, the specific weight is at most 450 g / m2, more preferably at most 400 g / m2, more preferably at most 350 g / m2, more preferably at most 300 g / m2. In terms of performance, the preferred embodiment offers a balance between lightweight and high performance. The use of the bloating paste chemical does not significantly increase the weight of the net, thereby maintaining its lightweight characteristic. At the same time, the chemical enhances the net's ability to disrupt thermal vision, thereby improving its performance in terms of concealment. This balance between lightweight and high performance is an advantage of the preferred embodiment, as it ensures that the net is both easy to handle and effective in its purpose.

[0068] In a preferred embodiment, the camouflage net has a water absorbency below 50%, more preferably a water absorbency below 40%, more preferably a water absorbency below 35%, more preferably a water absorbency below 30%, more preferably a water absorbency below 25%, more preferably a water absorbency below 20%, more preferably a water absorbency below 15%. In a preferred embodiment, the camouflage net has a water repellence of at least 4 as measured by ISO 4920. This preferred feature preferably increases the net's maneuverability in damp conditions by minimizing weight gain when wet, thus simplifying deployment and retraction activities. Water absorbency is measured in accordance with ASTM D570.

[0069] In a preferred embodiment, the camouflage net provides concealment in the UV, Near infra red (NIR) and short-wave infra red (SWIR) region. In particular, the camouflage net provides concealment in the range of 400 to 2500 nm wavelengths. Concealment in these ranges can be achieved by traditional means as known in the art of (2D) camouflage nets.

[0070] In a preferred embodiment, the camouflage net provides RADAR concealment. More preferably, the radar attenuation value measured at 15°C for frequencies between 1 and 100 GHz is at least 7 dB, more preferably at least 8 dB, more preferably at least 9 dB, most preferably at least 10 dB.

[0071] In a preferred embodiment, the camouflage net has colour fastness to artificial light of at least 4, more preferably at least 5 as measured by ISO 105 B02.

[0072] In a preferred embodiment, the camouflage net has an antibacterial protection as measured by EN ISO 20743 of at least 95%, more preferably at least 97%, more preferably at least 98%, most preferably at least 99%.

[0073] In a preferred embodiment, the camouflage net has an effective antifungal protection in accordance with AATCC 30:2017.

[0074] In a further embodiment, the bloating paste chemical may be applied in varying concentrations across different areas of the net. This variation in concentration preferably creates a range of thicknesses across the net, resulting in a range of temperature variations and thus a more effective disruption of thermal vision. The concentration of the bloating paste chemical is preferably between 0% and 50% relative to the weight of the base fabric. 0% is included as having areas which are not coated and thus not swollen is desirable, it results in a fabric which is more lightweight while still having the same disruption of the thermal image.

[0075] In a preferred embodiment, the camouflage net is self-extinguishing. This can be achieved through the use of traditional fire retardants as known in the art. Advantageously, the use of the swelling agents as described herein do not prevent effective use of fire retardants, thereby increasing fire safety. This characteristic is particularly advantageous in an operational environment where fire hazards may be prevalent.

[0076] In a more preferred embodiment, the bloating paste chemical may have a composition that is specifically formulated to enhance its self-extinguishing properties. This composition may include, for example, fire retardant compounds or substances that release non-combustible gases when heated. Such a formulation would preferably enhance the fire safety of the camouflage net without compromising its thermal disruption capabilities. This can be achieved by including fire retardant additives into the mixture of ethoxylated alcohol, glycerol and reaction products thereof.

[0077] The gloss value of the net is preferably at most 5 GU, more preferably at most 4 GU, more preferably at most 3 GU, most preferably at most 2 GU. The gloss value of the net is preferably between 0 and 5 GU, more preferably between 0.5 and 4 GU, even more preferably between 0.5 and 3 GU, even more preferably between 1.0 and 2.5 GU, even more preferably between 1.0 and 2.0 GU, and most preferably at most 2 GU according to ISO 2813 at a 85° geometry. This range of gloss values ensures that the net remains less reflective, thereby maintaining its camouflage capabilities even in bright sunlight. This reduces the reflective property of the net when exposed to sunlight, thereby further enhancing its camouflage capability during daytime conditions.

[0078] Overall, this preferred embodiment of the invention provides an effective solution for enhancing the camouflage capabilities of the net, particularly in the thermal region and during daytime conditions.

[0079] In a particular preferred embodiment, said camouflage net does not appear uniform when viewed with a thermal camera. More preferably, said camouflage net does not appear uniform in the 3 to 5 pm wavelength range and in the 8 to 12 pm wavelength range. Preferably, the net is hung from a bar in a flat manner and subjected to ambient temperature. The net should not appear uniform both when subjected to direct (sun)light as well as when placed within the shade. The preferred embodiment of the invention provides a significant advantage in terms of thermal camouflage. The application of the bloating paste and the resulting bloated surface create temperature variations across the net, which can effectively obscure the presence of soldiers or equipment under the camouflage net from thermal imaging. This is a significant improvement over traditional 2D camouflage nets, which typically emit a uniform thermal image and are therefore easier to detect with thermal imaging devices.

[0080] In a preferred embodiment, the camouflage net has a tensile strength in the warp direction as measured by ISO 1421-1 of at least 300N, more preferably at least 400N, more preferably at least 500N, more preferably at least 600N. In a preferred embodiment, the camouflage net has a tensile strength in the weft direction as measured by ISO 1421-1 of at least 300N, more preferably at least 400N, more preferably at least 500N, more preferably at least 600N.

[0081] In a preferred embodiment, the camouflage net has a tear strength in the warp direction as measured by ISO 9073-4 of at least 100N, more preferably at least 125N, more preferably at least 150N, more preferably at least 175N, more preferably at least 200N, more preferably at least 225N, more preferably at least 250N. In a preferred embodiment, the camouflage net has a tear strength in the weft direction as measured by ISO 9073-4 of at least 100N, more preferably at least 125N, more preferably at least 150N, more preferably at least 175N, more preferably at least 200N, more preferably at least 225N, more preferably at least 250N. In a preferred embodiment, the camouflage net has a burst strength of at least 600 kPa, more preferably at least 700 kPa, more preferably at least 800 kPa, more preferably at least 900 kPa, more preferably at least 1000 kPa, more preferably at least 1100 kPa, more preferably at least 1200 kPa as measured by ISO 13938-1 at 7.3 cm2diameter.

[0082] High tensile strength and high tear strength and high burst strength is desirable to provide a high durability, high strength camouflage net. However, a tradeoff is made between high strength, weight and concealment capabilities.

[0083] In an aspect, present invention relates to a method for producing camouflage nets. In a preferred embodiment, the method for producing a camouflage net, said camouflage net providing camouflage in both the visible and thermal spectrum, said method comprising the steps of: providing a base fabric; coating said base fabric with a thickening chemical in a camouflage pattern, wherein said thickening chemical comprises a mixture of ethoxylated alcohol and glycerol; thereby forming a camouflage pattern in the thermal spectrum; and dying a camouflage pattern onto said base fabric, thereby forming a camouflage pattern in the visible spectrum.

[0084] The application of the thickening chemical to provide the camouflage pattern in the thermal spectrum; and the application of visible dye to provide the camouflage pattern in the thermal spectrum can both be performed simultaneously, even utilizing a single rotary screen for each color and thickening paste concentration utilized. This method greatly reduces the required process steps and equipment.

[0085] Alternatively, separate camouflage patterns can be applied. By applying separate camouflage patterns in the visible and thermal range; both can be optimized to better mimic the background in which they will be utilized. This is desirable as often the visible and thermal image of a background environment is quite different.

[0086] In a preferred embodiment, the bloating paste is applied during the printing process of the camouflage net. This application may relate to various concentrations of the paste, which can be adjusted to create different thermal patterns across the net. More preferably, the paste is applied through rotary screens onto the 2D mesh fabric with a camouflage pattern. This process preferably results in a thicker surface locally on the net, which contributes to the temperature variations and enhances the thermal camouflage effect. The method of applying the bloating paste with rotary screens is beneficial as it leverages the well-established technology of rotary screens for printing concealment patterns. This means that the process can be easily adopted without requiring significant changes in the existing production methods and I or equipment. In addition, the use of rotary screens allows for a high degree of precision in the application of the bloating paste, which can be crucial in ensuring the effectiveness of the camouflage.

[0087] In a preferred embodiment, the invention relates to the application of a thickening chemical through multiple rotary screens onto a base fabric. This process, preferably, creates an intricate thermal camouflage pattern on the net, which enhances the camouflage effect, particularly in the thermal region. The thickening chemical, preferably, is delivered via multiple rotary screens, each with differing concentrations, thereby creating a more complex pattern of temperature variations across the net.

[0088] The bloating paste chemical can be printed onto the 2D mesh fabric with a camouflage pattern and at various concentrations. This process may result in a thicker surface locally on the net, leading to temperature variations across the net. These temperature variations are preferred as they help to conceal the 2D net in the thermal region rather than emitting a uniform thermal image. This is a significant improvement over traditional 2D nets, which generally appear flat or plain in color in the thermal image, reducing the effectiveness of the concealment.

[0089] The rotary screens used for the application of the thickening chemical are preferably designed to apply the chemical in a pattern that mimics natural environments. This may include, but is not limited to, patterns that resemble foliage, rocks, or other natural elements. The design of these patterns is preferably such that they disrupt the thermal image of the object or person being concealed, making it more difficult for thermal detection systems to identify them.

[0090] In conclusion, this preferred embodiment of the invention provides a method for creating a camouflage net that is more effective in the thermal region. By applying a thickening chemical in varying concentrations through multiple rotary screens, the net is provided with an intricate thermal camouflage pattern that disrupts the thermal vision of observers.

[0091] EXAMPLES The present invention will now be further exemplified with reference to the following examples. The present invention is in no way limited to the given examples.

[0092] Example 1

[0093] A traditional camouflage net, produced from a base fabric made of warp knitted polyester was enhanced for its thermal concealment by coating with a thickening paste.

[0094] The camouflage net was coated with a thickening chemical comprising ethoxylated alcohol and glycerol. The coating is applied in a camouflage pattern using two rotary screens. The second rotary screen used a 50% increase in thickening chemical concentration compared to the first. The resulting net has an average thickness with local deviations of more than 20% from the average.

[0095] The net has a specific weight of 275 g / m2and a gloss of at most 2 GU. When viewed in the 3 to 5 pm and the 8-12 pm wavelength range, the net does not appear uniform while hung flat in direct sunlight as well as in shade. This example demonstrates the improved thermal camouflage and enhanced durability of the invention.

[0096] The resulting net has a water absorbency lower than 25% as measured by ASTM D570; a water repellence of 4 in accordance with ISO 4920 and is self extinguishing as determined by ISO 6941. The tensile strength was higher than 500N in the warp direction and higher than 400N in the weft direction as measured by ISO1421-1. The bursting strength was higher than 1000 kPa at 7.3 cm2diameter as measured by ISO 13938-1.

[0097] This example demonstrates the improved thermal concealment of a 2D net which remains lightweight, strong, durable with sufficient fire safety and limited water absorption.

[0098] Comparative example 2

[0099] A second sample of the traditional camouflage net from example 1 was tested for thermal concealment, without application of the thickening paste. When viewed in the 3 to 5 pm and the 8-12 pm wavelength range, the net appears entirely uniform both when hung flat in direct sunlight and when hung flat in shade.

[0100] It is supposed that the present invention is not restricted to any form of realization described previously and that some modifications can be added to the presented example of fabrication without reappraisal of the appended claims. For example, the present invention has been described referring to camouflage nets, but it is clear that the invention can be applied to other forms of military equipment for instance or to civilian applications such as hunting gear.

[0101] It is clear that the method according to the invention, and its applications, are not limited to the presented examples. The present invention is in no way limited to the embodiments described in the examples. On the contrary, methods according to the present invention may be realized in many different ways without departing from the scope of the invention.

Claims

CLAIMS1. Camouflage net characterized in that said camouflage net is coated with a thickening chemical, wherein said thickening chemical comprises ethoxylated alcohol, glycerol and reaction products thereof.

2. Camouflage net according to claim 1, wherein said coating is not uniform, preferably said camouflage net has an average thickness, wherein said camouflage net has locations with a local thickness which deviates at least 20% from said average thickness.

3. Camouflage net according to any of claims 1-2, wherein said coating is provided in a camouflage pattern.

4. Camouflage net according to any of claims 1-3, wherein said camouflage net is a 2D camouflage net, more preferably the camouflage net has a net mesh dimension smaller than 50 mm2, more preferably smaller than 10 mm2.

5. Camouflage net according to any of claims 1-4, wherein said camouflage net comprises a base fabric, wherein said base fabric is knitted or woven, preferably said base fabric is warp knitted.

6. Camouflage net according to any of claims 1-5, wherein said base fabric is made from a material selected from: polyester, polyamide, cotton or mixtures thereof, most preferably polyester.

7. Camouflage net according to any of claims 1-6, wherein said camouflage net has a specific weight between 200 and 350 g / m2in accordance with ISO 3801.

8. Camouflage net according to any of claims 1-7, wherein said camouflage net has a water absorbency lower than 30% as measured by ASTM D570.

9. Camouflage net according to any of claims 1-8, wherein said camouflage net is self extinguishing as determined by ISO 6941.

10. Camouflage net according to any of claims 1-9, wherein said camouflage net has a gloss of at most 2 GU measured according to ISO 2813 at a 85° geometry.

11. Camouflage net according to any of claims 1-10, wherein said camouflage net does not appear uniform when viewed in a 3 to 5 pm wavelength range.

12. Camouflage net according to any of claims 1-11, wherein said camouflage net does not appear uniform when viewed in a 8 to 12 pm wavelength range.

13. Camouflage net according to any of claims 1-12, comprising a base fabric, wherein said base fabric is coated with a thickening chemical in a camouflage pattern, thereby forming a camouflage pattern in the thermal spectrum; and wherein said base fabric is dyed with a camouflage pattern, thereby forming a camouflage pattern in the visible spectrum.

14. Method for producing a camouflage net, said camouflage net providing camouflage in both the visible and thermal spectrum, said method comprising the steps of: providing a base fabric; coating said base fabric with a thickening chemical in a camouflage pattern, wherein said thickening chemical comprises a mixture of ethoxylated alcohol and glycerol; thereby forming a camouflage pattern in the thermal spectrum; and- dying a camouflage pattern onto said base fabric, thereby forming a camouflage pattern in the visible spectrum.

15. Method according to claim 14, wherein said thickening chemical is coated onto said base fabric in a camouflage pattern using a rotary screen.

16. Method according to any of claims 14-15, wherein said thickening chemical is coated onto said base fabric with at least two rotary screens with a different concentration of thickening chemical in said at least two rotary screens.