JPH0118948Y2 - - Google Patents

Description

[Detailed explanation of the idea]

a. Industrial Application Field The present invention relates to a flexible tube for transporting high-temperature gas and the like. b. Conventional technology Conventionally, flexible tubes have been made by using a material made by pasting asbestos paper and glass cloth in this order onto a thin metal plate using a heat-resistant adhesive, and winding the thin metal plate so that it is on the inner surface. There is. The above-mentioned asbestos paper is used to improve heat resistance and heat shielding properties against high-temperature gases to be transported. c. Problems that the invention aims to solve However, asbestos paper is prone to respiratory diseases due to the fine asbestos particles generated during the manufacturing process, which poses problems in terms of occupational health. Furthermore, conventional asbestos paper did not necessarily have satisfactory heat resistance properties. The present invention has been made in view of the above circumstances, and its purpose is to provide a flexible tube that can eliminate the above-mentioned drawbacks. d Means for solving the problem In order to solve the problem of the above-mentioned conventional technology,
This invention contains 20 to 15 parts by weight of natural organic short fibers, 40 to 70 parts by weight of ceramic powder, 25 to 8 parts by weight of inorganic short fibers,
A heat-resistant layer composed of 15 to 7 parts by weight of synthetic organic short fibers and one or more of one or more of additives such as a binder, a flame retardant, a sizing agent, a fixing agent, and a polymer flocculant in the required amount. and a layer of a thin metal plate, and each layer is pasted using a heat-resistant adhesive to form a strip-shaped material, and the strip-shaped material has at least two layers consisting of a layer of a thin metal plate and a layer of a thin metal plate. The tube is spirally wound to form a tubular shape, spiral pleats are formed on the inner and outer surfaces, and the flexible tube is compressed in the axial direction. e. Embodiments The present invention will be described below with reference to embodiments shown in the accompanying drawings. 1 and 2 show an embodiment of a flexible tube according to the present invention. The flexible tube is obtained by spirally winding a strip material 1, forming spiral pleats 2 on the inner and outer surfaces of the formed tube, and compressing it in the axial direction. The above-mentioned strip material 1 includes a thin metal plate 3, a heat-resistant paper 4,
The glass cloth 5 is adhered in this order using a heat-resistant adhesive. In addition, the strip material 1 is a thin metal plate 3
on the inner surface of the flexible tube. Although the illustrated example has three layers, it is also possible to have a two-layer structure in which the grass cloth 5 is omitted. Alternatively, layers of other materials may be added to make four or more layers. The heat-resistant paper 4 contains 20 to 15 parts by weight of natural organic short fibers, 40 to 70 parts by weight of ceramic powder, 25 to 8 parts by weight of inorganic short fibers, 15 to 7 parts by weight of synthetic organic short fibers, and 15 parts by weight of a binder. , 8 parts by weight of flame retardant, 1 part by weight of sizing agent, 1 part by weight of fixing agent, and flocculant.
Contains 0.3 parts by weight. Natural organic short fibers are used to provide sheet strength and improve papermaking suitability, and various pulps used for papermaking, such as wood pulp and dust fiber pulp, can be used. In addition, this natural organic short fiber is 10 to 15
A length of mm or less is suitable. The ceramic powder needs to be fine enough to be made into a sheet during paper making, but it is better to use a small powder that can pass through 200 meshes or more. Although the sintering temperature and the degree of swelling in water vary depending on the composition, it is desirable that the material has dimensional stability in the drying temperature range during paper making and does not decompose or become dimensional when heated to 300°C, which is the heat-resistant temperature of flexible tubes. silicate,
Alumina, zirconia, magnesia, etc. or a combination thereof can be used. When a sheet is exposed to a temperature of 200℃ or higher, organic matter gradually decomposes and paper strength decreases.
By using inorganic short fibers, extreme deterioration in paper strength is prevented. Artificial fibers such as short glass fibers, glass wool, ceramic fibers, rock wool, and slag wool are effective for this purpose. This inorganic short fiber preferably has a length of 10 to 15 mm or less. Synthetic organic short fibers have a small ratio of short fibers to powder, so natural organic short fibers alone do not provide flame retardancy even if they provide paper strength, so they are used for the purpose of imparting flame retardancy. Effective materials include modacrylic fiber, PVC fiber, polyclar fiber, flame-retardant acrylic, and twist-retardant vinylon. Common additives include binders, flame retardants, sizing agents, fixing agents, and polymeric flocculants. These additives are used in appropriate combinations. Various binders are used depending on the purpose, such as improving the yield of ceramic powder, imparting flame retardancy to the sheet, improving sheet strength, and imparting flexibility to the product. For example, NBR, SBR, CR,
One or two of NR, PVC, latex, Saran latex, and various acrylic emulsions are mainly used for the above purpose, and auxiliary effects are achieved by combining resins such as PAA, PAE, etc. In order to produce more effective product effects, it is preferable to use chemicals that contain chlorine in the product molecule. Flame retardants are used to make the product more flame retardant, and guanidine-based and phosphoric acid-based flame retardants are processed together with sizing agents in a size press or the like during the papermaking process. When molding the sheet into a flexible tube, a water-soluble glue is used in the process of laminating it with other combination materials, so in order to achieve the effect with less glue, it is necessary to add sizing and coating. Used to impart aptitude. Various sizing agents such as petroleum-based, rosin-based, wax-based, starch-based, PVA-based, and synthetic sizing agents have this effect. The fixing agent is used for the purpose of fixing additive chemicals to fibers and powder, and fixing powder to fibers, and sulfuric acid is usually used. Polymer flocculants are used to collect fine fibers and particles that have fallen off due to forces such as stirring during the papermaking process into larger particles before being placed on the papermaking net. , anionic polyacrylamide-based materials are effective. Any other retention aid that can fix ions may be used. When producing the heat-resistant paper 4, first, natural organic short fibers are introduced into a pulper and thoroughly decomposed. This slurry was heated to 15 to 80°SR using a Refainer.
(mouth water level), and then sent to a mixing chamber, where powdered ceramics, inorganic short fibers, and synthetic organic short fibers are added and mixed.When they are thoroughly mixed, binders, sizing agents, flame retardants, and fixing agent are mixed and sent to the machine chest. Next, a flocculant is mixed to improve the fixation of the fine fibers and particles, and the sheet is formed into a sheet using a paper machine, dried, and rolled up. An example of heat-resistant paper 4 obtained as described above is listed below. Compounding example 1 Raw materials Compounding amount (parts by weight) Ceramic powder (passed through 325 mesh) 60 NBKP 20 Glass fiber 9μ×3mm 10 Flame-retardant vinylon 10 Chloroprene latex 15 Rosin size 1 Sulfate band 1 Flocculant PAA 0.3 Compounding example 2 Raw materials Blend amount (parts by weight) Ceramic powder (passed through 325 mesh) 60 NBKP 20 Ceramic wool 10 Modagril fiber 10 PVC copolymerized acrylic EM 15 Petroleum size 1 Band sulfate 1 Coagulant PAA 0.3 Various properties of heat-resistant paper according to the above formulation examples 1 and 2 The physical properties were as shown in the table below.

[Table] Note: Conventional examples show cases where asbestos is used.
The heat-resistant paper with the above formulation uses ceramic powder instead of asbestos, but the paper strength deterioration rate, tensile strength, tear strength, etc. at the usage temperature are equal to or higher than asbestos. In addition, although it contains a high proportion of ceramic powder, the dispersion and fixing technology makes it a stable powder-mixed paper. In addition, in the present invention, as other thin plates used in combination with the heat-resistant paper, composite materials, paper, glass cloth, and various other materials can be used. f. Effects of the invention The flexible tube according to the invention uses the materials described above and does not use asbestos paper, and solves industrial hygiene problems, and has heat resistance, heat insulation properties, and difficulty It has many advantages including excellent flammability and flexibility.

[Brief explanation of the drawing]

FIG. 1 is a partially cut-out side view of a flexible tube according to the present invention, and FIG. 2 is a cross-sectional view taken along line A--A in FIG. 1. 1...Band-shaped material, 2...Spiral folds, 3...
Metal thin plate, 4...Heat-resistant paper, 5...Glass cloth.

Claims (1)

[Scope of claim for utility model registration] (1) 20 to 15 parts by weight of natural organic short fibers, 40 to 70 parts by weight of ceramic powder, 25 to 8 parts by weight of inorganic short fibers, 15 to 7 parts by weight of synthetic organic short fibers, etc. , a heat-resistant layer composed of a required amount of one or more of binders, flame retardants, sizing agents, fixing agents, and polymer flocculants as additives; and at least two layers consisting of a thin metal plate layer. The material has layers, and each layer is bonded using a heat-resistant adhesive to form a strip-shaped material, and the strip-shaped material is spirally wound so that the thin metal plate layer is on the inner surface to form a tubular shape. A flexible tube with spiral folds formed on the inner and outer surfaces and compressed in the axial direction. (2) The above-mentioned heat-resistant layer consists of three layers including a glass gloss layer, or four or more layers including another layer, and a belt-like structure is formed in which each of these layers is bonded using a heat-resistant adhesive. The flexible tube according to claim (1) of the utility model registration, characterized in that it is made of a material.