JP2011030798A - Fire extinguisher and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fire extinguisher capable of keeping required pressure resistance and impact resistance over a long period of time by covering a base material layer which is the body of a pressure resistant container by a protective layer and surely preventing degradation due to the weatherability of the base material layer, and to provide a method of manufacturing the same. <P>SOLUTION: The fire extinguisher includes the pressure resistant container 2 filled up with a fire extinguishing agent. The pressure resistant container 2 includes the pressure resistant base material layer 3 in a multilayer structure formed of a thermoplastic resin, and a protective layer 4 arranged on the outer side. The protective layer 4 made of a thermoplastic resin to which an ultraviolet ray shielding agent is added. For the pressure resistant container 2, a multilayer formed of the thermoplastic resin having the base material layer and the protective layer arranged on the outer side is arranged between divided dies and blow-molded. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fire extinguisher including a pressure-resistant container filled with a fire extinguisher and a method for manufacturing the fire extinguisher.

  In a fire extinguisher that contains fire extinguishing powder, water, high-pressure gas, etc., a technique for blow-molding a fire extinguisher made of a thermoplastic resin that is lighter than a current metal container and a pressure resistant container made of the thermoplastic resin is progressing. The pressure-resistant container made of thermoplastic resin is described in, for example, Japanese Patent Application Laid-Open No. 2004-196926 (Patent Document 1).

  However, pressure-resistant containers are said to have sufficient pressure strength and gas barrier properties, but in a fire extinguisher, they are installed outdoors and exposed to direct sunlight or indirect light for a long period of time. In many cases, the pressure resistance and impact resistance decrease due to aging deterioration of the resin constituting the container. Accordingly, techniques for reinforcing the pressure resistance of the container are described in Japanese Utility Model Laid-Open No. 60-182069 (Patent Document 2) and Japanese Utility Model Publication No. 6-20546 (Patent Document 3).

JP 2004-196926 A Japanese Utility Model Publication No. 60-182069 Japanese Utility Model Publication No. 6-20546

  By the way, in the pressure-resistant container of the fire extinguisher described in Patent Document 2 or Patent Document 3, the outer periphery of the container is provided with reinforcing means, but deterioration due to the weather resistance of the resin constituting the container is It is unavoidable that both of them have a problem that the pressure resistance and the impact resistance are lowered due to the aging deterioration of the resin constituting the container.

  Therefore, the present invention provides a pressure-resistant container for a fire extinguisher equipped with a pressure-resistant container filled with a fire extinguishing agent, and has a multilayer structure made of a thermoplastic resin and has a pressure resistance, and at least a protective layer disposed on the outside thereof. By covering the base material layer, which is the main component of the pressure-resistant container, with a protective layer, the deterioration due to the weather resistance of the base material layer is surely prevented, and the required pressure resistance and impact resistance over a long period of time. It aims at obtaining the fire extinguisher which can hold | maintain.

  The present invention is a fire extinguisher comprising a pressure-resistant container filled with a fire extinguishing agent, wherein the pressure-resistant container is arranged in a multilayer structure composed of a thermoplastic resin and has a pressure resistance and at least outside thereof. And a protective layer.

  The present invention also relates to a method of manufacturing a fire extinguisher including a pressure-resistant container filled with a fire extinguishing agent, and a multilayer of thermoplastic resin having a pressure-resistant base material layer and at least a protective layer disposed outside thereof. A parison is disposed between the divided molds, and then the divided molds are clamped and blow-molded, and a base material layer having a pressure resistance with a multilayer structure made of a thermoplastic resin, and a protective layer disposed at least outside thereof It is characterized by obtaining a pressure-resistant container filled with the fire extinguishing agent constituted by.

  In the fire extinguisher according to the present invention, the protective layer is made of a thermoplastic resin to which an ultraviolet shielding agent is added, the adhesive layer is interposed between the base material layer and the protective layer, and the protective layer The outer periphery can be further covered with a shrink label.

  According to the present invention, as a pressure-resistant container of a fire extinguisher having a pressure-resistant container filled with a fire extinguisher, a base material layer having a pressure resistance with a multilayer structure made of a thermoplastic resin and a protection disposed at least outside thereof By covering the base layer that is the main component of the pressure-resistant container with a protective layer, the deterioration due to the weather resistance of the base layer is surely prevented, and the required pressure resistance and impact resistance are maintained over a long period of time. It is possible to maintain the sex.

It is sectional drawing which shows the pressure-resistant container of the fire extinguisher which concerns on this invention. FIG. 2 is a perspective view showing the pressure-resistant container shown in FIG. 1 is an overall perspective view of a fire extinguisher according to the present invention. It is an aspect which blow-molds the pressure-resistant container of the fire extinguisher which concerns on this invention, Comprising: It is sectional drawing which shows the process which has arrange | positioned the multilayer parison of a thermoplastic resin between division molds. It is sectional drawing which shows the process which clamped the division mold from the process of FIG. 4, and was blow-molded. It is sectional drawing which shows the process of opening a division | segmentation metal mold | die from the process of FIG. 5, and taking out a molded product.

  As shown in FIGS. 1 to 3, a fire extinguisher 1 according to the present invention includes a pressure resistant container 2 filled with a fire extinguishing agent. The pressure-resistant container 2 is composed of a pressure-resistant base material layer 3 made of a thermoplastic resin and a protective layer 4 disposed on the outside thereof, and is a main body that maintains the required pressure resistance of the pressure-resistant container 2. A certain base material layer 3 has a structure in which the entire outside is covered with a protective layer 4. The protective layer 4 is made of a thermoplastic resin to which an ultraviolet shielding agent is added. Although not shown, an adhesive layer of a modified polyolefin resin may be interposed between the base material layer 3 and the protective layer 4 in order to improve interlayer adhesion. (Not shown). Further, the protective layer 4 is not limited to one, and a plurality of protective layers 4 may be provided. The total thickness of the protective layer 4 is preferably in the range of less than 50% with respect to the thickness of the base material layer 3 in view of the protection and portability of the base material layer 3.

  The pressure-resistant container 2 is a part that directly stores a fire extinguishing agent. The pressure-resistant container 2 includes a cylindrical body portion 5, a hemispherical bottom portion 6 provided at a lower portion of the body portion, and a mouth portion 7 provided at an upper portion of the body portion 5. That is, in the pressure resistant container 2, the mouth portion 7, the body portion 5 and the bottom portion 6 are integrated in this order from the top.

  The mouth portion 7 is a protruding cylindrical shape, and a screw portion 8 is formed on the outer periphery of the mouth portion 7, and the cap 10 of the operation portion 9 is attached to the mouth portion 7. The operation unit 9 has a fixed lever 11 and a movable lever 12. 13 is a fire extinguishing agent injection hose. Reference numeral 14 denotes a bottom cover, and the bottom cover 14 ensures a self-supporting stable posture of the pressure-resistant container 2. Reference numeral 15 denotes a latch hook.

  On the other hand, the bottom 6 is slightly smaller in diameter than the body 5 in order to fit the bottom cover 14. Further, the bottom 6 is provided with a recess 16 for fixing the bottom cover 14.

  The recess 16 is linear, and a plurality of the recesses 16 are provided in a row in the horizontal direction and on the same surface on the outer periphery of the pressure-resistant container 2. And between each hollow part 16, the restraint part without a hollow is provided (not shown). Thereby, reinforcement of the bottom part 6 is achieved.

  The pressure-resistant container 2 is blow-molded using a thermoplastic resin so that the screw portion 8, the body portion 5 and the bottom portion 6 are integrally formed at the same time.

  Examples of such blow molding include a direct blow molding method and a biaxial stretch blow molding method. Among these, the pressure-resistant container 2 is preferably formed by a direct blow molding method from the viewpoint that a lightweight main body can be easily formed.

  Resins used as the thermoplastic resin include polyamide (PA), amorphous polyarylate (PAR), polycarbonate (PC), polyethersulfone (PES), polymethyl methacrylate (PMMA), polyphenylene ether (PPE), Examples include polystyrene (PS), polysulfone (PSF), or those obtained by polymerizing them. Among these, the amorphous resin is preferably a polymer alloy using polyphenylene ether (PPE) from the viewpoint of heat resistance and impact resistance. Specifically, a polymer alloy (PPE / PS alloy) of polyphenylene ether (PPE) and polystyrene (PS), a polymer alloy (PPE / HIPS alloy) of polyphenylene ether (PPE) and high-impact polystyrene (HIPS), Alternatively, modified polyphenylene ether such as polymer alloy (PPE / PA alloy) of polyphenylene ether (PPE) and polyamide (PA) can be used. Among these, the amorphous resin is particularly preferably a PPE / PS alloy having extremely excellent pressure resistance.

  As for the wall thickness of the pressure-resistant container 2, the total average thickness of the base material layer 3 and the protective layer 4 is preferably 2.0 mm or more, and more preferably 2.5 to 4.5 mm. When the average wall thickness is less than 2.0 mm, the pressure resistance tends to be insufficient as compared with the case where the wall thickness is within the above range, and when the wall thickness exceeds 5.0 mm, Compared with the case where the wall thickness is within the above range, not only the cost is increased, but also the weight is increased and it is difficult to carry the fire extinguisher.

  The breaking pressure of the pressure resistant container 2 is preferably 4.0 MPa or more. In this case, even if the high pressure gas in a general fire extinguisher pressurizes the inside of the fire extinguisher container, the fire extinguisher container can be reliably prevented from being deformed. In addition, it is more preferable that only the base material layer 3 achieves a fracture pressure of 4.0 MPa or more.

  The bending elastic modulus of the thermoplastic resin constituting the pressure-resistant container 2 is preferably 2000 Mpa or more, and more preferably 2000 to 5000 MPa. The flexural modulus is a value measured according to ASTM D790. When the bending elastic modulus is less than 2000 MPa, the pressure resistance tends to be inferior compared to the case where the bending elastic modulus is within the above range, and there is a risk that permanent deformation occurs in the body with respect to the pressure.

  The bending strength of the pressure resistant container 2 is preferably 70 MPa or more, and more preferably 70 to 95 MPa. The bending strength is a value measured according to ASTM D790. When the bending strength is less than 70 MPa, the pressure strength tends to be inferior compared to the case where the bending strength is within the above range, and cracking easily occurs with respect to the pressure. In addition, it is more preferable that only the base material layer 3 achieves a bending strength of 70 MPa or more.

  The Izod impact strength of the pressure-resistant container 2 is preferably 90 J / m or more, and more preferably 90 to 150 J / m. Such tensile strength is a value measured according to ASTM D256 (notched). When the Izod impact strength is less than 90 MPa, the Izod impact strength tends to be inferior in impact resistance compared to the case where the Izod impact strength is within the above range, and there is a possibility that the Izod impact strength may burst due to dropping or the like. In addition, it is more preferable that the Izod impact strength of 90 J / m or more is achieved only by the base material layer 3.

  The protective layer 4 is made of an olefin resin such as polyethylene or polypropylene, a fluorine resin such as polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride, or ethylene-tetrafluoroethylene copolymer, polyamide, polyphenylene sulfide, or polyacetal. Crystalline thermoplastic resins such as polystyrene, acrylotolyl-butadiene-styrene resin (ABS), acrylonitrile-styrene resin (AS), polymethylmethacrylic (PMMA), polycarbonate, polyvinyl chloride, polyvinylidene chloride, etc. Resins can be used, and in particular, those capable of performing multi-layer blow molding which is co-extruded with the resin constituting the base material layer 3 are preferable.

  Since the ultraviolet ray shielding agent is added to the protective layer 4 and is laminated so as to cover the entire outer surface of the base material layer 3, light such as ultraviolet rays from the outside, wind and rain, etc. reach the base material layer 3 by the protective layer 4. Without being absorbed and blocked by the protective layer 4. For this reason, it is possible to reliably prevent deterioration of weather resistance, pressure resistance, impact resistance, etc. even under severe conditions such as being installed outdoors for a long period of time. In particular, in this type of fire extinguisher 1, the shoulder 17 and the bottom 6 of the pressure-resistant container 2 are prevented from being deteriorated over time so that they can be used safely and stably for a long period of time under severe conditions such as outdoors. Make it possible.

  Furthermore, it is preferable to make it adhere | attach with a shrink label (not shown) so that the outer peripheral whole surface of the protective layer 4 may be covered. A shrink label made of a cylindrical heat-shrinkable film is preferably used. As such a shrink label, a single-layer or multi-layer transparent film made of polyester, polyurethane, nylon, polyethylene, polypropylene or the like is used. Among them, the shrink label is preferably a heat shrinkable film made of polyester from the viewpoint of versatility. The shrink label can be printed. The shrink label is preferably printed on the entire surface. That is, the shrink label is displayed in the pressure-resistant container 2 in various ways and printed on the back surface of the transparent heat-shrinkable film so as to block the ultraviolet rays from the outside. It is preferable to be formed. Thereby, a great effect can be obtained in addition to the ultraviolet blocking effect of the protective layer 4.

  In addition, it is preferable that the fire extinguisher 1 which concerns on this invention is a pressurization type fire extinguisher from a durable viewpoint, and it is preferable that the fire extinguisher used for this is a powder. For example, those containing ammonium dihydrogen phosphate as the main component, those containing sodium hydrogen carbonate as the main component, and those containing potassium hydrogen carbonate as the main component. An accumulator fire extinguisher may be used.

  The pressure-resistant pressure-resistant container 2 of the fire extinguisher 1 according to the present invention is blow-molded as shown in FIGS. That is, 18 and 18 are split molds, 19 is an extrusion head, and includes a thermoplastic resin layer 20 forming a pressure resistant base material layer co-extruded from the extrusion head 19 and a protective layer disposed on the outside thereof. The multilayer parison 22 of the thermoplastic resin layer 21 to be formed is arranged between the divided molds (FIG. 4), and then the divided molds 18 and 18 are clamped and blow-molded (FIG. 5) to form a multilayer made of thermoplastic resin. The pressure-resistant pressure-resistant container 2 composed of the base material layer 3 having a pressure resistance in the structure and the protective layer 4 disposed outside thereof is taken out (FIG. 6). In addition, as shown in FIG. 6, the burr | flash 23 which has arisen in the bottom part of the pressure-proof pressure-resistant container 2 is removed by post-processing.

DESCRIPTION OF SYMBOLS 1 Fire extinguisher 2 Pressure-resistant container 3 Base material layer 4 Protective layer 5 Body part 6 Bottom part 7 Mouth part 8 Screw part 9 Operation part 10 Cap 11 Fixed lever 12 Movable lever 13 Fire extinguisher injection hose 14 Bottom cover 15 Latch hook 16 Depression Part 17 Shoulder part 18, 18 Split mold 19 Extrusion head 20 Thermoplastic resin layer forming base layer 21 Thermoplastic resin layer forming protective layer 22 Multilayer parison 23 Bali

Claims (5)

A fire extinguisher having a pressure-resistant container filled with a fire extinguisher,
The pressure-resistant container is composed of a base material layer having a pressure resistance in a multilayer structure made of a thermoplastic resin, and a protective layer that covers the base material layer so that ultraviolet rays do not reach the base material layer. A special fire extinguisher.   The fire extinguisher according to claim 1, wherein the protective layer is made of a thermoplastic resin to which an ultraviolet shielding agent is added.   The fire extinguisher according to claim 1, wherein an adhesive layer is interposed between the base material layer and the protective layer.   The fire extinguisher according to any one of claims 1 to 3, wherein the outer periphery of the protective layer is further covered with a shrink label. A method of manufacturing a fire extinguisher comprising a pressure-resistant container filled with a fire extinguisher,
A multilayer parison of a thermoplastic resin having a base material layer having pressure resistance and at least a protective layer disposed outside thereof is disposed between the divided molds,
Next, the divided mold is clamped and blow-molded, and filled with the fire extinguisher composed of a base material layer having a pressure resistance with a multilayer structure made of a thermoplastic resin and at least a protective layer disposed outside thereof. A fire extinguisher manufacturing method, characterized in that a pressure-resistant container is obtained.

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