Double buoyancy fire hose and preparation method thereof

Abstract

The present invention relates to a double-buoyancy fire hose and its preparation method in the technical field of fire-fighting and rescue equipment, including a woven layer and an inner self-adhesive anti-leakage layer. The woven layer is woven from a fiber material with a density of 0.95 - 0.96 g / cm<supgt;3< / supgt>. The inner self-adhesive anti-leakage layer is formed into a tubular sleeve by an extrusion blow molding process from an EVA material with a density of 0.929 - 0.974 g / cm<supgt;3< / supgt>. The inner self-adhesive anti-leakage layer is bonded to the inner surface of the woven layer. Through the optimization of materials and structures, the double-buoyancy fire hose of the present invention makes the fire hose lighter, can effectively reduce the physical energy consumption of firefighters during fire extinguishing and rescue operations, and further improve the fire-fighting and rescue speed.

Description

Technical Field

[0001] The present invention relates to the technical field of firefighting and rescue equipment, and in particular to a double-buoyancy fire hose and a preparation method thereof. Background Art

[0002] A fire hose is a flexible pipe used to transport flame-retardant liquids such as high-pressure water or foam. Both ends of the fire hose have metal interfaces or special material interfaces, which can be connected to another hose to extend the distance or to a nozzle to increase the liquid spray pressure and range.

[0003] Fire hoses are used as a channel for conveying fire water. After the fire truck arrives at the fire scene, firefighters need to carry multiple fire hoses to lay the fire waterway. Especially in some narrow areas, high-rise buildings and forest fires where fire trucks cannot approach, the weight of the fire hoses undoubtedly adds a huge burden to the physical consumption of firefighters. At present, the weight of a 25-80-20 meter long ordinary fire hose is about 10kg. If each firefighter carries 3 hoses, he needs to carry a total weight of about 30kg. If the weight of the fire hose can be reduced, it will undoubtedly be like the speed of a 100-meter sprinter reducing the weight of his shoes or clothes. It can reduce the weight and energy consumption of firefighters, maintain their physical strength, and increase the speed of rescue and firefighting.

[0004] Through prior art search, it is found that the Chinese utility model patent publication number is CN106287019A, which discloses a fire hose, which relates to the technical field of fire fighting equipment. It includes a belt body and a high temperature resistant composite layer; the belt body is made of polyester filaments or polyester yarns twisted and woven by a circular loom, and the high temperature resistant composite layer is composed of the following components by weight percentage: 50-60% EPDM rubber, 20-30% vermiculite, 5-10% plasticizer, 3-5% adhesive, and 1-3% paraffin; the thickness ratio of the belt body and the high temperature resistant composite layer is 2:1. This utility model has the above-mentioned problem that the fire hose is too heavy. Summary of the invention

[0005] In view of the defects in the prior art, an object of the present invention is to provide a double-buoyancy fire hose and a preparation method thereof.

[0006] According to the present invention, a double buoyancy fire hose comprises a woven layer and an inner self-adhesive anti-leakage layer, wherein the woven layer has a density of 0.95-0.96 g / cm 3 The inner self-adhesive anti-leakage layer is made of a fiber material with a density of 0.929-0.974g / cm 3 The EVA material is formed into a cylindrical sleeve through extrusion blow molding process;

[0007] The inner self-adhesive anti-leakage layer is bonded to the inner surface of the woven layer.

[0008] In some embodiments, the fiber material of the woven layer includes polyethylene fiber material or a mixed fiber material of polyethylene fiber and polyester.

[0009] In some embodiments, the woven layer is a plain weave structure, a twill structure, a concave-convex diagonal stripe structure, or a concave-convex plain stripe structure.

[0010] In some embodiments, the inner self-adhesive anti-leakage layer is bonded to the inner surface of the woven layer by a heating self-adhesive process, or,

[0011] The inner self-adhesive anti-leakage layer is bonded to the inner surface of the woven layer by adhesive.

[0012] In some embodiments, when the inner self-adhesive anti-leakage layer is bonded to the inner surface of the woven layer by a heating self-adhesive process, the heating temperature at which the inner self-adhesive anti-leakage layer forms a self-adhesive state is 85-98°C.

[0013] In some embodiments, the inner self-adhesive anti-leakage layer has a thickness of 0.02 to 2 mm.

[0014] The present invention also provides a method for preparing a double-buoyancy fire hose, comprising the following steps:

[0015] Braided layer preparation steps: select density 0.95-0.96g / cm 3 The fiber material forms warp and weft, and the warp and weft form a woven layer through a weaving process;

[0016] Preparation steps of inner self-adhesive anti-leakage layer: the inner self-adhesive anti-leakage layer is made of a density of 0.929-0.974g / cm 3 , EVA material with VA content of 5-40% is blow-molded to form a cylindrical sleeve;

[0017] The bonding step of the braided layer and the inner self-adhesive anti-leakage layer is as follows: the inner self-adhesive anti-leakage layer is attached to the inner surface of the braided layer by weaving or penetrating, the inner self-adhesive anti-leakage layer is made to be in a self-adhesive state by heating, and the suitable temperature is controlled to be maintained for 3 to 5 minutes. After the inner self-adhesive anti-leakage layer is fully infiltrated and adhered to the braided layer, the braided layer and the inner self-adhesive anti-leakage layer are bonded by internal pressure and heating;

[0018] Drying step: using an oven to heat and dry the fire hose formed by bonding the woven layer and the inner self-adhesive anti-leakage layer, and then cooling it to form a double-buoyancy fire hose.

[0019] In some embodiments, in the step of bonding the woven layer to the inner self-adhesive anti-leakage layer, the heating temperature for the inner self-adhesive anti-leakage layer to form a self-adhesive state is 85-98°C.

[0020] In some embodiments, in the step of bonding the woven layer and the inner self-adhesive anti-leakage layer, the internal pressure and heating method is to blow air or pass hot water into the fire hose, the temperature of the blown air is 20-98°C, and the temperature of the passed hot water is 50-98°C.

[0021] In some embodiments, in the drying step, the heating temperature used for heating and drying is 50 to 99°C.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The double-buoyancy fire hose of the present invention is made lighter by optimizing the material and structure, which can effectively reduce the physical energy consumption of firefighters during fire fighting and rescue, and further improve the speed of fire fighting and rescue.

[0024] 2. The overall structural density of the double-buoyancy fire hose of the present invention is less than the density of water. The fire hose can float on the water and can be used as a buoy to rescue people in the water and send marks and signals in an emergency. When a ship or other water equipment leaks oil onto the water surface due to leakage, fire, etc., the double-buoyancy fire hose of the present application can also be used as an oil boom, providing a protection solution for the multifunctional equipment of fire rescue forces.

[0025] 3. The present invention forms an inner self-adhesive anti-leakage layer of EVA material through an extrusion blown film process. On the one hand, it serves as the inner lining anti-leakage layer of the fire hose. On the other hand, it utilizes the self-adhesive effect to bond itself to the woven layer into an integrated structure, without the need to use adhesives and other materials for bonding, thereby further reducing the weight of the fire hose and making the manufactured fire hose more environmentally friendly.

[0026] 4. In the manufacturing process of the double-buoyancy fire hose of the present invention, whether it is the heating temperature of the inner self-adhesive anti-leakage layer to form a self-adhesive state, or the temperature of the air or hot water introduced when the inner self-adhesive anti-leakage layer is bonded to the woven layer, or the heating temperature during drying, all do not exceed 100°C, and the damage to various chemical fibers, especially polyethylene fiber filaments, is almost zero, which can ensure the characteristics of the materials in the fire hose product, so that the mechanical and other properties of the formed fire hose can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0028] Figure 1 It is a schematic diagram of the structure of the double buoyancy fire hose of the present invention;

[0029] Figure 2 It is a schematic flow chart of the preparation method of the double buoyancy fire hose of the present invention;

[0030] Figure 3 It is a schematic structural diagram of a double-buoyancy fire hose test device of the present invention;

[0031] In the accompanying drawings, the relevant marks are:

[0032] 1-woven layer, 2-inner self-adhesive anti-leakage layer, 3-fire hose, 4-test barrel, 5-auxiliary rod, 6-weight. DETAILED DESCRIPTION

[0033] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0034] Example 1

[0035] like Figure 1 As shown, the present invention provides a double buoyancy fire hose, comprising a woven layer 1 and an inner self-adhesive anti-leakage layer 2. The woven layer 1 is used as the outer layer structure of the fire hose, and the density is selected to be 0.95-0.96g / cm 3 The single fiber material or mixed fiber material is formed into warp and weft, and then the braided layer 1 is formed by a braiding process. When the material of the braided layer 1 is a single fiber, it is preferably polyethylene fiber filament, and the relative density of the polyethylene fiber filament is 0.95-0.96 g / cm 3 , which can better meet the use requirements. When the material of the braided layer 1 is a mixed fiber, it is preferably a polyester fiber coated with a polyethylene fiber to form a mixed coated fiber material, and the polyethylene fiber is used as the core wire to enhance the strength and cutting resistance of the braided layer material. Although the density of the polyester fiber is 1.38-1.40g / cm 3 However, by controlling the dosage, the density after mixing with polyethylene fiber can still be between 0.95 and 0.96 g / cm 3 The inner self-adhesive anti-leakage layer 2 is used as the lining structure of the fire hose to prevent leakage of high-pressure fire water. The material selected is EVA (ethylene-vinyl acetate copolymer) material, which is formed into a cylindrical sleeve by extrusion blown film process. EVA (ethylene-vinyl acetate copolymer) is used as the material of the inner self-adhesive anti-leakage layer 2. The density of EVA is generally 0.929-0.974g / cm 3 , its density is also less than 1g / cm 3. Because EVA (ethylene-vinyl acetate copolymer) material has good flexibility and elasticity, it still has good flexibility, transparency and surface gloss at -50°C, good chemical stability, good anti-aging and ozone resistance, and non-toxicity, which improves the performance and practicality of the fire hose. The inner self-adhesive anti-leakage layer 2 is bonded to the inner surface of the woven layer 1, thereby forming the overall structure of the fire hose. Among them, the bonding method of the inner self-adhesive anti-leakage layer 2 and the woven layer 1 includes bonding with an adhesive and direct bonding without using an adhesive.

[0036] Because the density of the materials used for the braided layer 1 and the inner self-adhesive anti-leakage layer 2 is less than 1g / cm 3 , that is, the structural density of any layer of the two-layer structure of the fire hose is less than 1g / cm 3 , so that the overall structural density of the fire hose formed by the present invention is less than 1g / cm 3 state. Compared with the structure in the prior art that the fire hose basically uses a polyurethane layer as the inner lining layer, the weight of the fire hose per meter of the present invention is reduced by 20%-40%. For example, a 25-80-20m fire hose using a polyurethane layer as the inner lining layer weighs about 8kg, while in the present application, by using EVA material as the inner lining layer, the weight of the fire hose is about 5kg. For this reason, the double-floating structure of the fire hose of the present invention can make the fire hose lighter, which can greatly reduce the physical energy consumption of firefighters when extinguishing a fire, and further increase the rescue speed. At the same time, since the overall structural density of the fire hose of the present invention is less than 1g / cm 3 The double-buoyancy fire hose of the present application can also be used as an oil boom, providing a protection plan for the multifunctional equipment of fire rescue forces.

[0037] Preferably, the braided layer 1 can be any one of a plain weave structure, a twill structure, a concave-convex diagonal stripe structure or a concave-convex flat stripe structure. In particular, when the braided layer 1 is a concave-convex diagonal stripe structure or a concave-convex flat stripe structure, the wear resistance of the braided layer 1 can be effectively improved, and the service life of the fire hose can be extended.

[0038] Example 2

[0039] like Figure 1-Figure 2 As shown, this embodiment 2 is formed on the basis of embodiment 1. By optimizing the bonding method of the inner self-adhesive anti-leakage layer, the inner self-adhesive anti-leakage layer and the woven layer are bonded into one by a heating self-adhesive process, and there is no need to use adhesives, which further reduces the weight of the fire hose and makes the fire hose more environmentally friendly.

[0040] The inner self-adhesive anti-leakage layer 2 of EVA material is bonded to the inner surface of the woven layer 1 by a heating self-adhesive process. Specifically: the warp and weft formed by polyethylene fiber filaments or a mixture of polyester filaments and polyethylene fiber filaments are formed into a woven layer 1 of a cylindrical structure through a weaving process; the EVA material is formed into an inner self-adhesive anti-leakage layer 2 of a cylindrical structure through an extrusion blown film process; the inner self-adhesive anti-leakage layer 2 is adhered to the inner surface of the woven layer 1 by weaving or penetrating; finally, the inner self-adhesive anti-leakage layer 2 is formed into a self-adhesive state by heating, and the inner self-adhesive anti-leakage layer 2 is bonded to the inner surface of the woven layer 1 for a certain period of time, and then through the steps of internal pressure, heating, and drying, the adhesion between the inner self-adhesive anti-leakage layer 2 and the woven layer 1 is greater than or equal to 20N / 25mm to form a fire hose.

[0041] In the above, the inner self-adhesive anti-leakage layer 2 is attached to the woven layer 1 by weaving, which means that after the inner self-adhesive anti-leakage layer 2 forms a cylindrical structure, in the process of the warp and weft forming the woven layer 1, part of the warp and weft are covered by the inner self-adhesive anti-leakage layer 2 during weaving, so that the inner self-adhesive anti-leakage layer 2 is pre-fixed on the inner surface of the woven layer 1. This structure can make the inner self-adhesive anti-leakage layer 2 evenly attached to the inner surface of the woven layer 1, and can make the inner self-adhesive anti-leakage layer 2 evenly adhere to the inner surface of the woven layer 1 to the greatest extent, and due to the interactive combination of the inner self-adhesive anti-leakage layer 2 and the woven layer 1, the bonding force between the two is greatly improved, thereby improving the firmness of the inner self-adhesive anti-leakage layer 2.

[0042] The inner self-adhesive anti-leakage layer 2 is inserted into the woven layer 1, which means that after the woven layer 1 forms a cylindrical structure, the inner self-adhesive anti-leakage layer 2 with the cylindrical structure is directly inserted into the cylinder of the woven layer 1, so that the outer surface of the inner self-adhesive anti-leakage layer 2 fits with the inner surface of the woven layer 1.

[0043] The inner self-adhesive anti-leakage layer 2 of the EVA material is bonded to the inner surface of the woven layer 1 through a heating self-adhesive process. On the one hand, it serves as a sealing lining layer of the fire hose to achieve an anti-leakage effect. On the other hand, it utilizes the self-adhesive effect to bond itself to the woven layer 1 into an integrated structure, without the need to use other adhesive materials to bond the two. This not only further reduces the weight of the fire hose, but also makes the fire hose more environmentally friendly.

[0044] Preferably, the thickness of the inner self-adhesive anti-leakage layer 2 is 0.02 mm to 2 mm. When the thickness of the inner self-adhesive anti-leakage layer 2 is less than 0.02 mm, it will be too thin to meet the compactness under a certain pressure and cannot play a good anti-leakage role; when the thickness of the inner self-adhesive anti-leakage layer 2 is greater than 2 mm, because the layer body is too thick, not only is it difficult to control the adhesion when combined with the woven layer 1, which increases the difficulty of process control, but also increases the overall weight and hardness of the fire hose.

[0045] Preferably, the inner self-adhesive anti-leakage layer 2 is made of EVA material with a VA (vinyl acetate) content of 5-40%. In particular, EVA material with a VA (vinyl acetate) content in the range of 10-28% is selected, which has good hot-melt adhesion and good coating product performance, and is more suitable for the structural characteristics of the double buoyancy fire hose of the present application.

[0046] Example 3

[0047] like Figure 1-Figure 3 As shown, this embodiment 3 is a method for preparing a double-buoyancy fire hose formed on the basis of embodiment 1 or 2, comprising the following steps:

[0048] Braided layer preparation steps: select density 0.95-0.96g / cm 3 The fiber is used as the material of the braided layer, and a tubular braided layer with any structure of plain weave, twill weave, concave-convex diagonal stripes or concave-convex plain stripes is formed through a weaving process. Preferably, in the process of forming the braided layer in this step, the inner self-adhesive anti-leakage layer can be connected to the inner surface of the braided layer by weaving.

[0049] Preparation steps of the inner self-adhesive anti-leakage layer: select VA (vinyl acetate) with a content of 5-40% and a density of 0.929-0.974g / cm 3 The EVA (ethylene-vinyl acetate copolymer) material is formed into a cylindrical sleeve structure by extrusion blow molding process. The inner self-adhesive anti-leakage layer 2 is further preferably the relative density of the EVA material is 0.948 g / cm 3 The outer diameter of the inner self-adhesive anti-leakage layer 2 is substantially matched with the inner diameter of the braided layer 1. The thickness of the inner self-adhesive anti-leakage layer 2 is preferably 0.02 mm to 2 mm.

[0050] The step of bonding the braided layer and the inner self-adhesive anti-leakage layer: the inner self-adhesive anti-leakage layer 2 is attached to the inner surface of the braided layer 1 by weaving or penetrating, and the inner self-adhesive anti-leakage layer 2 is formed into a self-adhesive bonding state by heating to 85-98°C, and after controlling the appropriate temperature for 3-5min, air is blown into the fire hose or hot water is passed into the fire hose for internal heating and pressurization, so that the inner self-adhesive anti-leakage layer 2 is bonded to the inner surface of the braided layer 1. The temperature of the blown air is hot air of 20°C-98°C, and the temperature of the hot water passed is preferably 50°C-98°C. In this step, preferably, the braided layer is also degreased or solvent-treated. Here, the degreasing or solvent-treatment of the braided layer may include a weaving-in method with an inner self-adhesive anti-leakage layer. Through the heating self-adhesive process, the inner self-adhesive anti-leakage layer 2 of the EVA material is used as the lining layer of the double-buoyancy fire hose to achieve an anti-leakage effect. On the other hand, it uses its own adhesive effect to bond itself to the woven layer 1 into an integrated structure without the need to use adhesive materials, further reducing the weight of the fire hose and making the fire hose more environmentally friendly.

[0051] Drying step: drying the fire hose formed by bonding the woven layer and the inner self-adhesive anti-leakage layer in an oven, wherein the drying heating temperature is controlled at 50-99° C., so that the woven layer and the inner self-adhesive anti-leakage layer form a double-buoyancy fire hose product without adhesive material. The oven used is preferably a mobile oven.

[0052] The fire hose structure manufactured by the process of the present method has been tested to have an adhesion greater than or equal to 20N / 25mm, and various indicators are not less than 75% of those before the test when tested at 70°C for 168 hours.

[0053] In the double-layer structure of the fire hose produced by this method, the structural density of any layer is less than 1g / cm 3 That is, both the inner and outer layers have good buoyancy. Compared with the fire hose in the prior art where only the woven layer is the buoyancy layer, its buoyancy value is increased by about 50%, which broadens the function and application scope of the fire hose. The test method and test results are briefly described as follows:

[0054] Test method: Two reels of fire hose 3 with model number 20-65-20, one reel is the double buoyancy fire hose of the present application (marked as No. 1 fire hose), and the other reel is the single buoyancy layer fire hose in the prior art (the braided layer has a density of less than 1g / cm 3 Polyethylene material, marked as No. 2 fire hose), using two test barrels 4 of the same model, the water depth added to the test barrels is 300mm, and an auxiliary rod 5 is provided in the test barrel 4.

[0055] Test process: Fire hose No. 1 and fire hose No. 2 are placed flat in the test water bucket 4 respectively, and both fire hoses are in a floating state. The buoyancy values ​​of the two are compared by gradually adding weights 6.

[0056] Test results: When weights were added to fire hose No. 1 and fire hose No. 2 to 2000g respectively, fire hose No. 1 remained in a floating state, while fire hose No. 2 slowly sank to the bottom of the test barrel; when weights were added to fire hose No. 1 to 3000g, fire hose No. 1 began to slowly sink to the bottom of the test barrel.

[0057] It should be noted that the floating state during the test refers to the part of the entire fire hose that is exposed above the water surface in the height direction.

[0058] In addition, in the entire manufacturing process of the double-buoyancy fire hose of the present application, whether it is the heating temperature of the inner self-adhesive anti-leakage layer to form a bonding state, or the temperature of the air or hot water introduced when the inner self-adhesive anti-leakage layer is bonded to the woven layer, and the heating temperature in the drying step, etc., all do not exceed 100°C, and the temperature within 100°C causes almost zero damage to various chemical fibers, especially polyethylene fiber filaments. Therefore, it can better ensure the characteristics of the materials in the fire hose products, so that the mechanical and other properties of the formed fire hose can be improved.

[0059] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0060] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A double buoyancy fire hose, characterized in that: It comprises a braided layer (1) and an inner self-adhesive anti-leakage layer (2), wherein the braided layer (1) is woven from a fiber material with a density of 0.95-0.96 g / cm³, and the inner self-adhesive anti-leakage layer (2) is made of an EVA material with a density of 0.929-0.974 g / cm³, and is formed into a cylindrical sleeve by an extrusion blow molding process; The braided layer (1) is a concave-convex oblique stripe structure or a concave-convex flat stripe structure; The inner self-adhesive anti-leakage layer (2) is bonded to the inner surface of the woven layer (1); The inner self-adhesive anti-leakage layer (2) is bonded to the inner surface of the woven layer (1) by a heating self-adhesive process, the inner self-adhesive anti-leakage layer is attached to the inner surface of the woven layer by weaving or penetrating, and the inner self-adhesive anti-leakage layer is heated to achieve a self-adhesive state; When the inner self-adhesive anti-leakage layer (2) is bonded to the inner surface of the woven layer (1) by a heating self-adhesive process, the heating temperature at which the inner self-adhesive anti-leakage layer (2) forms a self-adhesive state is 85-98° C.; The inner self-adhesive anti-leakage layer (2) is attached to the woven layer (1) by weaving in, which means that after the inner self-adhesive anti-leakage layer (2) forms a cylindrical structure, in the process of the warp and weft forming the woven layer (1), part of the warp and weft are covered by the inner self-adhesive anti-leakage layer (2) during weaving, thereby pre-fixing the inner self-adhesive anti-leakage layer (2) to the inner surface of the woven layer (1).

2. The double buoyancy fire hose according to claim 1, characterized in that: The fiber material of the braided layer (1) includes polyethylene fiber material or a mixed fiber material of polyethylene fiber and polyester.

3. The double buoyancy fire hose according to claim 1, characterized in that: The thickness of the inner self-adhesive anti-leakage layer (2) is 0.02-2 mm.

4. A method for preparing a double-buoyancy fire hose, characterized in that: The double buoyancy fire hose according to any one of claims 1 to 3 comprises the following steps: The steps of preparing the woven layer are as follows: selecting a fiber material with a density of 0.95-0.96 g / cm³ to form a warp and a weft, and the warp and the weft are woven to form a woven layer (1); Preparation steps of the inner self-adhesive anti-leakage layer: the inner self-adhesive anti-leakage layer is formed into a cylindrical sleeve by blow molding using an EVA material with a density of 0.929-0.974 g / cm³ and a VA content of 5-40%; The bonding step of the braided layer and the inner self-adhesive anti-leakage layer is as follows: the inner self-adhesive anti-leakage layer is attached to the inner surface of the braided layer by weaving or penetrating, the inner self-adhesive anti-leakage layer is made to be self-adhesive by heating, and the suitable temperature is controlled to be maintained for 3 to 5 minutes. After the inner self-adhesive anti-leakage layer is fully infiltrated and adhered to the braided layer, the braided layer and the inner self-adhesive anti-leakage layer are bonded by internal pressure and heating; Drying step: using an oven to heat and dry the fire hose formed by bonding the woven layer and the inner self-adhesive anti-leakage layer, and then cooling it to form a double-buoyancy fire hose.

5. The method for preparing a double buoyancy fire hose according to claim 4, characterized in that: In the step of bonding the woven layer and the inner self-adhesive anti-leakage layer, the internal pressure and heating method is to blow air or pass hot water into the fire hose, the temperature of the blown air is 20~98℃, and the temperature of the passed hot water is 50~98℃.

6. The method for preparing a double buoyancy fire hose according to claim 4, characterized in that: In the drying step, the heating temperature used for heating and drying is 50~99°C.

Images