JP2005312680A - Heat-insulated bottle holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a miniaturized and high-performance heat-insulated bottle holder in place of a conventional thermostat type heat-insulated bottle holder such as a jelly bottle for ultrasonic diagnosis. <P>SOLUTION: The heat-insulated bottle holder has a heat generating sheet of a PTC heater 3 consisting of a self-temperature adjusting heater. The heat generating sheet is formed by the printing with printing ink for the self-temperature adjusting heater made of vinyl acetate-polyethylene copolymer, carbon particulates and the mixture of carbon particulates for controlling the printing sheet thickness on a heat conductive and electric insulating crystalline polymer sheet face. The range of the heat generation temperature is 35-45 °C. A bottle holder body is an aluminum tank 2, and the heat conductive and electric insulating crystalline polymer sheet face is closely attached to the outer surface of the aluminum tank 2 with a double-sided adhesive tape. A heat-insulation cloth 5 comprises a heat insulation sheet and a heat reflection sheet layered on the printed face. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bottle receiver having a heat retaining means.

  More specifically, it relates to a bottle receiver comprising a container with a heater for maintaining a liquid or a solid-liquid fluid in a bottle at a predetermined temperature, and in particular, a medical bottle that can be maintained at a temperature near a human body temperature, For example, the present invention relates to a heat retaining bottle receiver that accommodates a jelly bottle for ultrasonic imaging.

  Conventionally, a heat-retaining bottle holder that can be maintained at a temperature close to the body temperature of a human being is an electric resistance heater such as a nichrome wire, like a boiling pot of hot water, a milk pot for infants, etc. Was detected by a sensor, judged by a control circuit, and a relay was operated to energize the heating element.

  Also in the medical field, for example, in the case of a container receiver that houses a cylindrical container with a discharge port at one end, used for ultrasonic diagnosis, the presence or absence of the container is detected by a sensor, the control circuit determines, and the relay operates A method of energizing the heating element in this way can be seen in a known example shown in Japanese Patent Application Laid-Open No. 2001-245887 (Patent Document 1). This is because an ultrasonic jelly used in ultrasonic diagnosis or the like is kept at an appropriate temperature and used as a container receiver for reducing discomfort when applied to a subject. Thus, even in a field where temperature control is strict, there is only a description that a thermostat is used as the temperature control means of the heating element.

  A heating element that does not rise above a predetermined temperature without using a thermostat, a so-called self-temperature adjusting heating element (also referred to as a PTC heating element) has been commercialized as a heater for floor heating. One of the present inventors has also made various studies on the self-temperature-controlled heating element and has developed a method for producing a homogeneous heater by a simple printing method, and has been proposed in, for example, Patent Document 2.

  The ink for the self-temperature-controlled planar heating element uses a copolymer of vinyl acetate and polyethylene having a specific composition as a base polymer. On the other hand, the conductive fine carbon fine particles have a particle size smaller than that of the carbon fine particles. A non-conductive sheet such as a polyester sheet is prepared by dispersing and dissolving in a solvent a composition containing conductive particles made of a mixture of carbon fine particles that controls the printing film thickness with a large and sized particle size. It is printed and used as a self-temperature control heater (PTC heater).

  Furthermore, in order to provide a self-temperature-regulating planar heating element that can be printed and that can avoid local linear heat generation when the printing method is adopted, one of the present inventors has found that conductive particles and non-conductive particles are used. A heat generating part made of a regular polymer composition and a control part made of a crystalline material that controls the heat generation amount of the heat generating part are directly or indirectly closely integrated, and the control part receives the heat of the heat generating part. Patent Document 3 proposes that the temperature of the heat generating part can be effectively adjusted by increasing the electrical resistance of the heat generating part that is thermally expanded and is in close contact with the control part. Specifically, the heating part is a mixture of ethylene-vinyl acetate copolymer, silicone, butadiene, etc., which is an amorphous polymer, and carbon particles, and the control part is a sheet of crystalline polymer polyethylene, polyester, etc. In addition, the close contact means between the heat generating unit and the control unit is print coating.

JP 2001-245887 A ([0001] to [0005], [0067]) JP 10-183039 A (Claim 1, [0039]) JP 10-321346 A (Claim 1, [0011])

  In the prior art described in Patent Document 1, various sensors and relays or their control circuits are required for temperature control, and it is necessary to provide an expensive and complicated structure. In addition, since it has a complicated configuration, not only a large number of parts are required, but also a complicated work process is required, resulting in high costs.

  From the viewpoint of the temperature control performance, the thermostat has a difference (hysteresis) of 8 ° C or more between the transition temperature from ON to OFF and the transition temperature from OFF to ON, and it was difficult to achieve a constant temperature. . For this reason, when the content of the bottle to be kept warm is the jelly, it is too hot or too cold, so that the temperature difference with respect to the subject's skin is large and the discomfort is strong.

  Also, when inserting the bottle into the bottle holder, the contents and dirt attached to the bottle will move to the sensor, causing the malfunction of the moving part of the switch and blocking the LED light. There was a need to do. This increased the burden on the inspector, particularly in the case of jelly used for medical devices.

  On the other hand, PTC heaters composed of self-temperature-controlled planar heating elements have been studied so far to adapt to various applications, but sufficient product development for each application has not been made. Currently. In particular, a thin PTC heater that is small and follows a curved surface has not been studied so much, and there is a certain amount of description of an example dealt with a sheet having a complicated shape for a permanent hair dryer found in Patent Document 1, The application of a thin and stable PTC heater by the print coating seen in No. 3 was a future problem.

  The present invention solves the above-described problems, and the gist of the present invention is that instead of a thermostat type heat retaining bottle holder, a heat generating sheet of a PTC heater made of a self-temperature adjusting heat generating element is provided inside and outside the bottle receiving body. The heat retaining bottle holder is arranged at the periphery or the bottom.

  Here, as the heat generating sheet of the self-temperature adjusting heat generating element PTC heater, a simple polyethylene carbon particle system, polyethylene glycol-carbon particle system, etc. can be used. Dispersed in a solvent is a composition composed of a mixture of vinyl acetate-polyethylene copolymer, carbon fine particles, and carbon fine particles whose particle diameter is larger than the carbon fine particles and whose printed film thickness is controlled by the divided particle diameter. The heat generating sheet is formed by using the dissolved printing ink for self-temperature adjusting heater as a heat generating portion and printing it on the heat conductive and electrically insulating crystalline polymer sheet surface. This is a heating element having a preferred composition in that a heat retaining bottle holder having extremely stable performance can be obtained even if the sheet is made thin and is curved.

  The heating sheet heating temperature range of the PTC heater comprising the self-temperature adjusting heating element used in the present invention is 35 ° C to 45 ° C, preferably 36 ° C to 42 ° C. The bottle receiver is a case made of a heat insulating container on the outside, and the bottle receiver main body inside the case is a metal tank such as aluminum or stainless steel. This metal tank concentrates the heat heated by the PTC heater provided on the inner periphery or outer periphery of the metal tank on the bottle inserted therein, so that the thermally conductive and electrically insulating crystalline polymer sheet surface on the back surface of the PTC heater Is adhered to the outer surface of the metal tank with a double-sided tape, and a heat insulation sheet and a heat reflection sheet are laminated on the printing surface. For example, the heat insulation sheet is kept warm with a glass cloth and the heat reflection sheet is made of, for example, aluminum. If heat reflection is performed with the foil, the heat retaining property is further improved. The bottle accommodated in the heat retaining bottle receiver is, for example, a bottle containing ultrasonic jelly, and in the case of the above PTC heater, the temperature in the bottle receiver is 33 ° C. to 45 ° C., preferably 35 ° C. to 42 ° C. Within a range, a constant temperature can be secured.

  The self-temperature adjusting planar heating element has an excellent feature of maintaining a constant temperature by changing the electric resistance by its own heat generation. Due to this feature, there is no temperature hysteresis that was unavoidable with sensors, control circuits, relays and thermostats that have been essential in the past, so that it is possible to reduce subject discomfort when used as a bottle receiver for the jelly bottle. .

  In the present invention, since the sensor is unnecessary, even when the contents leak from the bottle and the bottle holder becomes dirty, the heat retaining operation is not affected at all. For this reason, the maintenance required conventionally is unnecessary, and the burden on the inspector can be reduced.

  In addition, the self-temperature adjusting planar heating element is created by a method of printing the heating element on a film sheet. Therefore, a heating element can be produced at low cost. Furthermore, it has an excellent feature that it can be bent freely. This feature eliminates the need to repeatedly wind a heating element such as a nichrome wire around a conventional bottle holder, and allows a simple and low-cost process of simply sticking a heating element film to a cylindrical bottle holder.

  In addition, the self-temperature-regulating planar heating element is characterized by low power consumption, but in order to concentrate heat in the metal tank, it is kept warm by a heat-insulating sheet and reflected by a heat-reflecting sheet such as aluminum foil. In addition, a number of effects can be obtained, such as further reducing power consumption and enabling quick heating.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a perspective view showing the internal structure of the PTC heater type bottle receiver of the present invention. FIG. 2 is a cross-sectional view showing the overall structure of the PTC heater bottle receiver. FIG. 3 is an energization circuit diagram of the PTC heater. FIG. 4 is a graph showing a temperature-time curve when a jelly bottle is inserted into the PTC heater type bottle receiver of the present invention, and FIG. 5 shows a temperature when a jelly bottle is inserted into a conventional thermostat type bottle receiver. It is a graph which shows a time curve.

  1 and 2, the bottle receiver 1 includes a metal tank having a bottle receiving body made of a cylindrical aluminum tank 2, and a PTC heater 3 wound around the outer peripheral surface thereof. For adhesion, a thin adhesive transfer double-sided tape having a thickness of 0.05 mm was used in order to increase thermal conductivity. The surface side of the PTC heater 3 may be inserted directly into the case 4 made of heat insulating foamed resin, but an insulating heat insulating cloth 5 is wound around the case in order to further increase the heat retaining property. A glass cloth with aluminum foil was used for the heat insulation cloth 5.

  A lead wire 7 is drawn from the electrode terminal 6 of the PTC heater 3 and connected to an AC outlet by a power cord 10 and a plug 11 through a temperature fuse 8 and an illuminated rocker switch 9. FIG. 3 is an example of the energization circuit diagram. Therefore, unlike the conventional thermostat type heat retaining bottle holder, the product is not bulky and can be made thin and extremely small.

  For example, a bottle 12 containing ultrasonic diagnostic jelly is inserted upside down into the PTC heater type bottle receiver 1 having such a structure as shown in FIG. . For this purpose, a tray 14 is placed on the bottom of the bottle receiver 1.

  The PTC heater 3 used in the present invention was manufactured as follows, for example. First, an ink having a particle size of 17 ± 1 μm was prepared by sizing microspherical glassy carbon (manufactured by Unitika Co., Ltd.) as carbon for thickness control. Next, 39 parts of ethylene-vinyl acetate copolymer (EVA) with a vinyl acetate content of 25% by weight (made by Kuraray Co., Ltd.), 32.8 parts of graphite (J-SP made by Nippon Synthetic Rubber), and 8.2 parts of the above glassy carbon were added to the planetar. The mixture was mixed in a vacuum at 120 ° C. with a Lee mixer. Tetralin was added little by little to this composition to produce an ink having a viscosity of 4800 cps. Next, a polyester film with a thickness of 150 μm and 300 x 900 mm is used as the thermally conductive and electrically insulating crystalline polymer sheet on the back side of the PTC heater. A heat generating layer having a thickness of about 20 μm was formed from the ink for use. The upper part of this was opened and energized with AC 20V to form a PTC heater 3 having a heat generation temperature of about 42 ° C.

  Table 1 summarizes the results of comparing the performance of the heat generating sheet of the PTC heater 3 with the bottle receiver 1 assembled as shown in FIGS. 1 and 2 with a conventional thermostat type bottle receiver. FIG. 4 shows a graph showing a temperature-time curve of Example 2 of the present invention, and FIG. 5 shows a graph showing a temperature-time curve of a comparative example. Example 1 has the structure shown in the cross-sectional view of FIG. 2, in which the surface of the PTC heater 3 wound around the surface of the aluminum tank 2 is further covered with a glass cloth with aluminum foil as a heat insulating cloth 5. . In Example 1, the heat insulating cloth 5 is omitted.

  Compared with the graph showing the temperature-time curve when the jelly bottle is inserted into the PTC heater type bottle receiver of the present invention in FIG. 4 and that of the conventional thermostat type bottle receiver in FIG. 5, the heat retention performance of the PTC heater is excellent. Is clear. That is, in the PTC heater, the temperature rise after energization is extremely smooth, and the temperature change of the bottle contents after reaching the equilibrium temperature is not seen at all. On the other hand, in the conventional example, it was recognized that the jelly temperature in the bottle was not stable due to the large hysteresis that reached 10 ° C. or higher due to the thermostat being turned on and off. Further, Example 1 in Table 1 omits the heat insulation cloth, but the tendency of the heat insulation graph is almost the same as that of Example 2, and thus is omitted. The effect of adopting the heat insulating sheet in Example 2 appears in Table 1. The heating speed is increased and the equilibrium temperature is slightly increased, which leads to saving of power consumption.

  In this way, by using a PTC heater composed of a self-temperature-regulating planar heating element as a heating element, in order to maintain a stable temperature when the target temperature is reached, a temperature hysteresis like a conventional thermostat is used. There is no change. In the present invention, as a heating element, a self-temperature-regulating planar heating element is attached to the bottle holder so that the sensor, the control circuit, and the thermostat are not required at a low cost and a constant temperature is maintained. In addition, a bottle holder with a heat retaining function that does not require maintenance can be realized.

It is a perspective view which shows the internal structure of the PTC heater type bottle receiver of this invention. It is sectional drawing which shows the structure of the PTC heater type bottle receiver of this invention. It is an energization circuit diagram of the PTC heater of the present invention. It is a graph which shows the temperature-time curve at the time of inserting a jelly bottle in the PTC heater type bottle receiver of this invention. It is a graph which shows the temperature-time curve at the time of inserting a jelly bottle in the conventional thermostat type bottle receiver.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bottle holder 2 Aluminum tank 3 PTC heater 4 Case 5 Insulation cross 6 Electrode terminal 7 Lead wire 8 Temperature fuse 9 Illumination type rocker switch
10 Power cord
11 Plug
12 bottles
13 Discharge port
14 saucer

Claims (6)

A heat retaining bottle holder in which a heat generating sheet of a PTC heater made of a self-temperature adjusting heating element is disposed on the inner peripheral portion or the outer peripheral portion of the bottle receiving main body. Self-regulating heating element is a conductive particle comprising a mixture of vinyl acetate-polyethylene copolymer, carbon fine particles, and carbon fine particles whose particle diameter is larger than the carbon fine particles and whose printed film thickness is controlled by the divided particle diameter. A heating sheet for a PTC heater formed by printing on a thermally conductive and electrically insulating crystalline polymer sheet surface a printing ink for a self-temperature-controlling heater obtained by dispersing and dissolving a composition containing 1. Insulating bottle holder. The heat retaining bottle receiver according to claim 1 or 2, wherein the heat generation temperature range of the heat generating sheet of the PTC heater comprising the self-temperature adjusting heat generating element is 35 ° C to 45 ° C. The bottle receiving body is a metal tank, and the heat conductive and electrically insulating crystalline polymer sheet surface of the PTC heater is adhered to the outer peripheral surface of the metal tank with a double-sided tape. The heat retaining bottle receiver according to claim 1, wherein the sheets are laminated. The heat retaining bottle receiver according to claim 1 or 4, wherein the case of the bottle receiver is a heat insulating container, and the bottle receiving main body is inserted and disposed in the heat insulating container. The heat retaining bottle receiver according to claim 1, wherein the bottle is a bottle containing an ultrasonic diagnostic jelly, and the temperature in the bottle receiver is 36 ° C. to 42 ° C. 5.

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