JP5861978B2 - Thermal storage board and manufacturing method thereof - Google Patents

Description

  The present invention relates to a heat storage board and a method for manufacturing the same, and more particularly to a heat storage board having excellent durability and heat retention and good workability and a method for manufacturing the same.

Conventionally, a resin heat storage board is embedded in, for example, a building structure and used as a heating panel.
Patent Document 1 discloses a floor heating facility as an example.
This floor heating equipment has a heat storage container filled with a heat storage agent inside, and a groove portion is provided on the outer surface of the heat storage container. Flooring materials such as flooring are laid.
According to such a configuration, heat of the heat medium flowing through the heat medium flow pipe is directly transmitted to the floor finish material, and the heat escaping downward is stored by the heat storage agent. Although it is excellent in performance, it is inferior in workability of the floor heating equipment.
More specifically, it is necessary to provide a groove on the outer surface of the heat storage container and to dispose a heat medium flow pipe in the groove, which makes it difficult to perform efficient construction on site.
On the other hand, patent document 2 discloses the heating material which improved such workability.
This heating material has resin panels facing each other so as to form a hollow part inside, and one resin panel is provided with a convex part projecting inside to project the planar heating element disposed in the hollow part. The part is sandwiched and fixed to the inner wall surface of the other resin panel, and the hollow part is filled with a heat storage agent.
According to such a configuration, the convex part that is formed to protrude inside presses against the planar heating element, so that the planar heating element can be firmly fixed to the inner wall of the resin panel and the convex part facing it. Since this is possible, assembly workability is enhanced.
However, in such a configuration, since the sheet heating element is sandwiched and fixed by the two resin panels, the fixing between the two resin panels is insufficient, causing a problem in durability as a heating material, and maintaining the heat. Insufficient sex.
More specifically, the tip of the convex portion formed on one resin panel is not welded to the inner surface of the other resin panel, and both resin panels are simply connected via a sheet heating element. Since a panel is only connected only in the peripheral part, when using for the floor heating material to which a compressive load is always loaded especially, the durability is impaired.

On the other hand, since the planar heating element is disposed in a sealed hollow portion formed by both resin panels, even if a flooring material is laid on the heating material, as in Patent Document 1, the planar heating element is used. The heat generated from the heating element is not directly transmitted to the floor finish, but is once transmitted to the heat storage agent and then to the floor finish, so that it is difficult to achieve efficient heat insulation. .
JP2003-194356 JP-A-8-273809

  In view of the above technical problems, an object of the present invention is to provide a heat storage board excellent in durability and heat retaining property and having good workability, and a method for manufacturing the same.

In order to achieve the above object, the heat storage board of the present invention is:
A first plate made of thermoplastic resin and a second plate made of thermoplastic resin facing the first plate made of thermoplastic resin;
By adhering the peripheral portions of each of the first plate made of thermoplastic resin and the second plate made of thermoplastic resin, a side peripheral surface is formed, and a sealed hollow portion is formed inside,
The first plate made of thermoplastic resin has a plurality of recesses on the outer surface so as to protrude on the inner surface side,
Each of the plurality of recesses has a butt flat portion at the tip, and the butt flat portion is butt welded to the second plate material made of thermoplastic resin, thereby forming an annular rib extending between the two plate materials,
A heat storage agent is filled in the sealed hollow portion,
Furthermore, it has a mesh-like planar heating element composed of a linear body in which a conductor is coated with a thermoplastic resin,
The planar heating element is fixed to the second plate made of thermoplastic resin so as to be embedded in the second plate made of thermoplastic resin from the outer surface side of the second plate made of thermoplastic resin.

According to the heat storage board having the above configuration, when the heat generated by the sheet heating element is stored by the heat storage agent, the mesh sheet heating element is embedded in the second plate made of thermoplastic resin, Since it is fixed to the second plate made of thermoplastic resin and the planar heating element and the second plate made of thermoplastic resin are in close contact with each other, a sufficient heat transfer area is secured between them, and in particular the second made of thermoplastic resin. When the flooring material is placed on the outer surface of the two plates facing upward, the heat generated by the planar heating element can be directly transferred to the flooring material, which ensures heat retention. On the other hand, the first plate made of thermoplastic resin and the second plate made of thermoplastic resin are directly butted and welded via a plurality of recessed portions, and particularly ensure compression rigidity by an annular rib extending between the two plates. Therefore, it is possible to ensure durability.
In addition, since the planar heating element composed of the linear body is embedded in the second plate made of thermoplastic resin, the linear body is cut even when a load is applied during use of the heat storage board. It is possible to prevent problems due to disconnection of the heating element.
Further, as in the prior art, after providing a groove portion in the plate material, a hot water pipe or cable heater for heating as a heating element is not required to be laid in such a groove portion, and is embedded in the second plate made of thermoplastic resin. Since it adheres to the 2nd board | plate material made from a thermoplastic resin with the form which is made, it is excellent in the construction property of a thermal storage board.

The thermoplastic resin that covers the conductor of the planar heating element is the same type of resin as the second plate material made of thermoplastic resin, and the planar heating element passes through the thermoplastic resin with the thermal resin. It is good to weld to the 2nd board | plate material made from a plastic resin.
Further, each of the plurality of recesses preferably has a side peripheral surface having a predetermined area so as to ensure a predetermined heat dissipation property and a predetermined internal volume so as to ensure a predetermined heat storage amount.
Furthermore, each of the plurality of recessed portions may have a regular hexagonal opening on the outer surface and be arranged in a honeycomb shape.

In order to achieve the above object, a method for manufacturing a heat storage board according to the present invention includes:
A method of manufacturing a heat storage board,
A wire in which a conductor is coated with a thermoplastic resin for one cavity of a pair of split molds that are annularly formed around the cavity and are each provided with a pinch-off portion that protrudes toward the opposing mold. Holding a sheet heating element composed of a sheet-like body;
A step of hanging and positioning the molten thermoplastic resin between the pair of split molds in a form protruding around the cavity of the pair of split molds;
Each molten thermoplastic resin is pressed against a corresponding mold cavity of a pair of divided types, and the sheet heating element held in one cavity is crimped in such a manner that it is embedded in one thermoplastic resin sheet. And a pair of split types so that the pinch-off portions of each of the pair of split molds are brought into contact with each other while forming a concave portion on the surface facing the other cavity of the other thermoplastic resin sheet And clamping two molds to weld two thermoplastic resin sheets,
Thereby, a sealed hollow plate-like body in which the peripheral edge corresponding to the pinch-off part is welded is formed,
Furthermore, a step of filling a heat storage agent through the inlet into the sealed hollow portion;
And closing the inlet.

According to the method for manufacturing a heat storage board having the above-described configuration, a thermoplastic in a molten state is obtained by using a planar heating element made of a linear body in which a conductor such as metal or carbon black is usually coated with a thermoplastic resin. When manufacturing a heat storage board from resin, the sheet heating element is welded to the thermoplastic resin through the surrounding thermoplastic resin by pressing the thermoplastic resin against the corresponding cavity holding the sheet heating element. As in the prior art, after providing a groove in the plate material, there is no need to lay a hot water pipe or cable heater for heating as a heating element in such a groove. Since the mesh-like planar heating element can be pressure-bonded to the second plate made of thermoplastic resin in a form embedded in the plate material, the workability of the heat storage board is excellent.

The shaping step includes a plurality of protrusions provided in the other cavity of the pair of split molds, the plurality of protrusions having a tapered shape toward the opposing split mold. On the other hand, it is preferable to shape a plurality of recessed portions corresponding to the plurality of protrusions on the surface of the thermoplastic resin sheet by pressing the corresponding thermoplastic resin sheet.
Furthermore, the step of forming the annular rib may include a step of abutting and welding the tip portions of the plurality of recessed portions formed on the surface of one thermoplastic resin sheet to the other thermoplastic resin sheet.

An embodiment of the heat storage board 10 according to the present invention will be described below in detail with reference to the drawings, taking as an example the case where the object to be heated is a floor.
As shown in FIG. 1 to FIG. 3, the heat storage board 10 is a rectangular thin plate as a whole, and includes a resin first plate member 102 and a resin second plate member 104 facing the resin first plate member 102. And by welding the peripheral portions of the resin first plate member 102 and the resin second plate member 104 to each other, a side peripheral surface 106 is formed, and a hollow portion 108 is formed inside. In order to fill the heat storage agent described later in the hollow portion 108, a filler inlet 109 is provided on the side peripheral surface 106.
More specifically, as will be described later, when the heat storage board 10 is formed by blow molding, the peripheral portions of the resin second plate 104 facing the resin first plate 102 are welded to each other, and the side peripheral surface After forming 106, an opening is provided in the side peripheral surface 106, and after filling the heat storage agent in the hollow portion 108, the injection port 109 is welded and sealed.
The injection port 109 may be provided not on the side peripheral surface 106 but on the surface of either the first resin plate 102 or the second resin plate 104. Depending on the amount of heat storage agent to be filled and the internal pressure, the inlet 109 may be sealed. When there is a risk of leakage of the heat storage agent from the stopped inlet 109, a cap type may be employed.
As the heat storage agent, a paraffin type such as polyethylene glycol, or an inorganic type such as sodium acetate hydrate or sodium sulfate hydrate can be used.
As the material constituting the first resin plate 102 and the second resin plate 104, polyolefin such as polyethylene and polypropylene, synthetic resin such as ABS, polycarbonate, polyamide, polyethylene terephthalate, and polybutylene terephthalate can be used.
In order to improve the strength or rigidity of the plate material, inorganic fillers such as talc and calcium carbonate may be added, and additives such as heat ray absorbers, light stabilizers, antioxidants, antistatic agents and flame retardants may be added. It may be added.

  The resin first plate member 102 has a plurality of concave portions 110 that taper inward on the outer surface 103 so as to protrude on the inner surface side. The recessed portion 110 has a bottom, has a truncated pyramid shape that tapers toward the inner surface, and the opening 105 has a regular hexagonal shape. As a result, when the heat storage board 10 is integrally formed by blow molding using a molten resin material, which will be described later, when the protrusion corresponding to the recessed portion 110 is provided in the cavity of the mold, it is pressed against the cavity by the blow pressure. The molded molten resin material is made easy to be extracted from the cavity. From this viewpoint, the crossing angle between the inner peripheral surface 113 of the recessed portion 110 and the plate material is preferably 75 to 85 °, particularly about 80 °.

  As shown in FIG. 3 and FIG. 4, each of the plurality of recessed portions 110 has an abutting flat surface portion 112 at the foremost detail, and the abutting flat surface portion 112 of the recessed portion 110 is made to the inner surface of the resin second plate member 104. An annular rib 50 extending between the two plate members 102 and 104 is formed by butt welding. The annular rib 50 substantially constitutes the thickness of the heat storage board 10 and ensures compressive strength when a load is applied in the thickness direction of the heat storage board 10. The number of the plurality of recessed portions 110, the height of the annular rib 50, and the like may be determined from such a viewpoint.

In each of the plurality of recessed portions 110, the opening 105 on the outer surface 103 of the first resin plate 102 is a regular hexagonal pyramid, and the openings 105 are arranged in a honeycomb shape on the outer surface. Thereby, it is possible to arrange the plurality of recessed portions 110 on the outer surface 103 most densely. With respect to the size of the opening 105 of each of the plurality of recessed portions 110, the depth of the recessed portions 110, and the interval between the adjacent recessed portions 110, the size of the opening 105 is large, the depth of the recessed portions 110 is deep, and the adjacent recessed portions As the interval between the portions 110 is smaller, the porosity of the heat storage board 10 as a whole can be improved. This contributes to weight reduction, but the volume of the sealed hollow portion 108 is reduced. As a result, the heat storage characteristics of the heat storage board 10 are affected, and the heat dissipation characteristics from the inner peripheral surface 113 of the recessed portion 110 are also affected.

More specifically, in order to obtain a desired heat storage characteristic with the filled heat storage agent, if the number of the annular ribs 50 is increased to ensure the compression rigidity, the volume of the sealed hollow portion 108 of the heat storage board 10 is correspondingly increased. Therefore, the injection pressure of the heat storage agent must be increased and injected into the sealed hollow portion 108, thereby increasing the risk of leakage of the heat storage agent from the inlet 109.

That is, on the premise of obtaining the same heat storage characteristics, the compression rigidity of the heat storage board 10 and the risk of leakage of the heat storage agent are in a trade-off relationship. When used for a heating panel, compression rigidity is required, so that the risk of leakage of the heat storage agent is increased. For this reason, the inlet 109 is preferably a cap system. Alternatively, when used for a ceiling heating panel, the compression rigidity is not so much required, so the risk of leakage of the heat storage agent is small. Therefore, the inlet 109 is not a cap method and the cutout opening is sealed by welding. You can just stop.

From such a viewpoint, the diagonal length (maximum major axis) of the recessed portion 110 on the outer surface 103 is preferably 5 to 30 mm, particularly about 5 to 15 mm. The total opening area of all the recessed portions 110 on the outer surface 103 is preferably about 10 to 70%, particularly about 20 to 45% of the area of the outer surface 103 of the first resin plate material 102. In addition, for example, in the case of the floor heating heat storage board 10, the thickness of the plate members 102 and 104 is preferably 3 to 20 mm, particularly about 5 to 10 mm.
On the other hand, as shown in FIGS. 3 and 4, the resin-made second plate member 104 is different from the resin-made first plate member 102 in that the recessed portion 110 is not provided and the planar heating element 300 is embedded therein.

More specifically, as shown in FIG. 5 and FIG. 6, the planar heating element 300, for example, surrounds the entire second resin plate 104, such as a nichrome wire that is a conductor having high electrical resistance. Covered with resin 302. In particular, when the heat storage board 10 is manufactured by molding a thermoplastic resin in a molten state by using the same type of thermoplastic resin as the material of the second resin plate 104, as will be described later, It is easily welded to the plate material 104. In addition, in this invention, a coating | cover includes not only what coats a wire-form conductor but the state which disperse | distributed the powder-form conductor in the thermoplastic resin.

As will be described later, the planar heating element 300 is embedded in from the outer surface side of the resin-made second plate member 104 by pressing a molten thermoplastic resin against the planar heating element 300. The sheet heating element 300 is fixed to the resin second plate member 104, and the sheet heating element 300 is in close contact with the resin second plate member 104 via the thermoplastic resin 302 covering the conductor. Efficient heat transfer between the second plate member 104 is possible. Here, the planar heating element 300 is a form in which a linear body in which a conductor is coated with a thermoplastic resin is formed in a mesh shape, and a portion of 1/3 or more, preferably 1/2 or more, of the surface area of the linear body. Is fixed in an embedded state from the outer surface side of the second plate member 104 made of resin.
As shown in FIG. 2, the heat storage board 10 is further electrically connected to the control unit 304 that controls the operating state of the planar heating element 300, the external power source 306, and the planar heating element 300, and the control unit The power supply device 308 is controlled by 304 to turn on and off the power supply, and the temperature sensor 310 detects the amount of heat stored in the heat storage agent.

When the start of the heating operation by the heat storage board 10 is instructed, the control unit 304 heats the floor to be heated by the heat storage board 10, and when the stop of the heating operation by the heat storage board 10 is instructed, the heating by the heat storage board 10 is performed. Like to stop. In this case, during the heating operation, the control unit 304 controls the on / off state of the power supply device 308 so that the heat storage amount in the heat storage board 10 becomes the set heat storage amount based on the detection information of the temperature sensor 310. The process is executed. Thereby, it is possible to heat the floor to be heated while preventing the sheet heating element 300 from being operated in vain, so that a reduction in running cost can be achieved.
Such control may be performed by providing a remote control operation unit for designating the start and stop of the heating operation by the heat storage board 10.
Next, the shaping | molding apparatus of the thermal storage board 10 is demonstrated below.
As shown in FIG. 7, the molding device 60 of the heat storage board 10 includes a molten resin extrusion device 62 and a mold clamping device 64 of a mold 73 disposed below the extrusion device 62. The molten thermoplastic resin extruded from is sent to the mold clamping device 64, and the mold clamping device 64 forms the molten thermoplastic resin.

The extruding device 62 is a conventionally known T-die 71, and detailed description thereof is omitted. However, the molten sheet-like thermoplastic resin P is extruded through an extruding slit having an elongated rectangular opening, and the mold clamp of the clamping device 64 is divided. It is suspended between the molds 73. The extrusion device 62 is provided for each of the resin first plate member 102 and the resin second plate member 104 so that two sheets of the thermoplastic resin P are suspended at a predetermined interval.

The extrusion slit is arranged vertically downward, and the sheet-like thermoplastic resin P extruded from the extrusion slit is sent vertically downward in a form that hangs down from the extrusion slit. The thickness of the sheet-like thermoplastic resin P can be changed by making the interval between the extrusion slits variable. Thereby, the sheet-like thermoplastic resin P is arrange | positioned between the division molds 73 in the state which has uniform thickness to an up-down direction (extrusion direction).
The mold clamping device 64 includes a pair of divided molds 73 and a mold 73 driving device.

The two divided molds 73 are arranged with the cavities 74 facing each other, and the cavities 74 are arranged along the substantially vertical direction. A plurality of protrusions are provided on the surface of the cavity 74 for molding the first resin plate 102 according to the plurality of recessed portions 110 provided in the first resin plate 102. More specifically, a protrusion having an outer shape that protrudes toward the other mold 73 and matches the shape of the recessed portion is provided at a predetermined position of the cavity 74 of the mold 73. On the other hand, a sheet heating element 300 to be welded in a form embedded in the resin second plate 104 is held on the surface of the cavity 74 for molding the resin second plate 104.

In each of the two divided molds 73, a pinch-off portion 76 is formed around the cavity 74. The pinch-off portion 76 is formed in an annular shape around the cavity 74 and protrudes toward the opposing mold 73. To do. As a result, when the two divided molds 73 are clamped, the tip portions of the pinch-off portions 76 come into contact with each other, and the two strips of the thermoplastic resin P form a parting line at the periphery thereof. Thus, an outer peripheral wall that closes the hollow portion is formed.

The mold 73 driving device is the same as the conventional one, and the description thereof is omitted. However, the two divided molds 73 are respectively driven by the mold 73 driving device and are divided into two in the open position. Two sheet-like thermoplastic resins P can be disposed between the molds 73 at a predetermined interval, and the pinch-off portions 76 of the two divided molds 73 come into contact with each other in the closed position. The pinch-off portions 76 come into contact with each other so that a sealed space is formed in the two divided molds 73.
The split mold 73 is provided with a conventionally known blow pin (not shown) so that blow pressure can be applied from within the sealed space formed by both molds 73 when the mold 73 is clamped. Has been.

The manufacturing method of the heat storage board 10 using the shaping | molding apparatus 60 of the heat storage board 10 which has the above structure is demonstrated below.
First, the sheet heating element 300 is held on the surface of the cavity 74 of one mold 73 for molding the resin second plate material 104 in a form of surface contact with the surface of the cavity 74.

Next, by intermittently extruding the stored thermoplastic resin at a predetermined extrusion amount per unit time from each extrusion slit, the thermoplastic resin swells, and the molten sheet-like thermoplastic resin P hangs downward. Thus, the sheet is extruded at a predetermined extrusion speed with a predetermined thickness, and two sheet-like thermoplastic resins P are arranged between the divided molds 73. In this case, the two sheets of thermoplastic resin sheet are then clamped with the split mold 73 to form a sealed space in the mold 73.

Next, by applying blow pressure from the sealed space in the mold 73 clamped through the blow pins, the respective sheet-like thermoplastic resins P are pressed toward the cavities 74 of the corresponding mold 73 to thereby form the sheet. Shaped thermoplastic resin P. More specifically, the peripheral wall is shaped by the inner peripheral surface 113 of the pinch-off portion 76, and the protrusion of the cavity 74 is formed on the surface facing the cavity 74 of the sheet-like thermoplastic resin P for the first resin plate 102. The shape according to the outer shape of the body is shaped, the butt flat portion is butt welded to the inner surface of the sheet-like thermoplastic resin P for the second resin plate material 104, and the recessed portion 110, thus the annular rib 52 is formed, On the other hand, the sheet heating element 300 held in the cavity 74 is pressed against the surface (outer surface) facing the cavity 74 of the sheet-like thermoplastic resin P for the resin-made second plate material 104, and the sheet heating element is pressed. 300 is embedded in the sheet-like thermoplastic resin P and welded to the sheet-like thermoplastic resin P in a close contact manner through the thermoplastic resin covering the periphery.
Next, the pair of split molds 73 are opened, the molded product is taken out, the burr portion B outside the pinch-off portion 76 is cut, and the molding is completed.
Next, a heat storage agent is poured into the sealed hollow portion 109 from the injection port 109, the injection port 109 is sealed by heat fusion or the like, and the temperature sensor 310, the control unit 304, and the power supply device 308 are electrically connected, and the heat storage board 10 is completed.

As described above, whenever the molten thermoplastic resin is intermittently extruded, the heat storage board 10 can be formed one after another by repeating the above-described steps, and melted intermittently by extrusion molding. It is possible to extrude the sheet-like thermoplastic resin P in a state, and shape the extruded sheet-like thermoplastic resin P into a predetermined shape using a mold 73.
In the heat storage board manufacturing method, two thermoplastic resin sheets have been described. However, it is possible to use a cylindrical parison instead of the two thermoplastic resin sheets.

  When a plurality of such heat storage boards 10 are used as a floor heating panel, the resin first plate member 102 and the resin second plate member 104 are firmly welded via the annular rib 50, and particularly compression rigidity. Therefore, the floor finishing material is laid on the second resin plate 104 with the outer surface 107 side of the second resin plate 1042 facing upward. By doing so, the sheet heating element 300 is embedded in the resin second plate 104 from the outer surface 107 side of the resin second sheet 104, so that the heat generated from the sheet heating element 300 is Since it is directly transmitted to the floor finishing material in contact with the outer surface 107 of the resin second plate material 104, it is possible to efficiently keep the temperature.

  As a molding procedure, as described above, by simply clamping the split mold 73, a sealed space is formed in the split mold 73, and a blow pressure is applied from the sealed space to mold the resin material. If a sheet-shaped resin is used before molding, a sealed space is formed between the cavity 74 and the resin material before the split mold 73 is clamped, and the resin material is sucked from the cavity 74 side. Alternatively, the resin material may be preshaped, and after the divided mold 73 is clamped, the resin material may be shaped by applying blow pressure from the sealed space.

  According to this method, it is possible to ensure good moldability even by molding a complicated shape by pre-shaping before this shaping. Further, when clamping the split mold 73, the resin material may be shaped by applying a blow pressure from the sealed space while sucking the resin material from the cavity 74 side. According to this method, it is possible to similarly ensure good moldability by applying a blow pressure while removing air accumulated in the concave portion of the cavity 74 by suction.

According to the heat storage board 10 having the above configuration, when the heat generated by the sheet heating element 300 is stored by the heat storage agent, the sheet heating element 300 whose periphery is coated with the thermoplastic resin is the second thermoplastic resin. In the form embedded in the plate material, it is fixed to the second plate made of thermoplastic resin through the surrounding thermoplastic resin, and the planar heating element 300 and the second plate made of thermoplastic resin are in close contact with each other. In the case where a floor finishing material is disposed on the second surface of the thermoplastic resin, with the outer surface side facing upward, while ensuring a sufficient heat area, the heat generated by the sheet heating element 300 is generated. It can be directly transmitted to the floor finishing material and has excellent heat retention. On the other hand, the first plate made of thermoplastic resin and the second plate made of thermoplastic resin are directly butt-welded through a plurality of recessed portions. , Especially by the annular ribs extending between both plates By securing a reduced rigidity, it is possible to ensure durability.

Further, as in the prior art, after providing a groove portion in the plate material, a hot water pipe or cable heater for heating as a heating element is not required to be laid in such a groove portion, and is embedded in the second plate made of thermoplastic resin. In this form, the heat storage board 10 is excellent in workability because it is fixed to the second plate made of thermoplastic resin through the thermoplastic resin covering the conductor of the sheet heating element 300.
The embodiments of the present invention have been described in detail above, but various modifications or changes can be made by those skilled in the art without departing from the scope of the present invention.
For example, in the present embodiment, a case has been described in which a plurality of regular hexagonal truncated pyramid-shaped recessed portions 110 are arranged in a honeycomb shape on the surface of a plate material. The plurality of recessed portions 110 may be arranged in a staggered pattern.

It is a top view of the front surface of the thermal storage board 10 which concerns on embodiment of this invention. It is a top view of the back surface of the thermal storage board 10 which concerns on embodiment of this invention. (A) is a partially enlarged view of the shell of FIG. 1, (b) is a cross-sectional view taken along line BB of (a), and (c) is taken along line CC of FIG. (A). It is sectional drawing which follows. It is a partial section perspective view of the shell of heat storage board 10 concerning the embodiment of the present invention. It is sectional drawing of the thermal storage board 10 which concerns on embodiment of this invention. FIG. 6 is a partial detail view of part A in FIG. 5. It is the schematic of the shaping | molding apparatus 60 of the thermal storage board 10 which concerns on embodiment of this invention.

P Sheet thermoplastic resin P
DESCRIPTION OF SYMBOLS 10 Thermal storage board 60 Molding apparatus 62 Extruding apparatus 64 Clamping apparatus 71 T die 73 Die 74 Cavity 76 Pinch off part 102 Resin first board 103 Outer surface 104 Resin second board 105 Opening 106 Peripheral side 107 Outer surface 108 Sealing hollow Portion 109 Inlet 110 Recessed portion 112 Planar portion 113 Inner peripheral surface 200 Depression 202 Bottom surface 204 Peripheral side surface 206 Annular inclined portion 208 Annular rising portion 210 Second recessed portion 211 Tip portion 300 Planar heating element 304 Control unit 306 External power source 308 Power source Device 310 Temperature sensor

Claims (7)

A first plate made of thermoplastic resin and a second plate made of thermoplastic resin facing the first plate made of thermoplastic resin, each of the first plate made of thermoplastic resin and the second plate made of thermoplastic resin A side peripheral surface is formed in a state in which the peripheral portions of the first and second peripheral portions are bonded to each other, a sealed hollow portion is formed inside, and the first plate made of thermoplastic resin has a plurality of protrusions so as to protrude on the inner surface side. A concave portion is formed on the outer surface, and each of the plurality of concave portions has a butt flat portion at the tip, and the butt flat portion is butt welded to the second plate made of thermoplastic resin. An annular rib extending is formed , the sealed hollow portion is filled with a heat storage agent, and further has a mesh-like planar heating element made of a linear body in which a conductor is covered with a thermoplastic resin,
The planar heating element is fixed to the second plate made of thermoplastic resin in a form embedded in the second plate made of thermoplastic resin from the outer surface side of the second plate made of thermoplastic resin. Heat storage board. The thermoplastic resin that coats the conductor of the planar heating element is the same type of resin as the second plate material made of thermoplastic resin, and the planar heating element is interposed between the thermoplastic resin and the thermoplastic resin. Second made
The heat storage board according to claim 1, which is welded to a plate material. 2. The heat storage board according to claim 1, wherein each of the plurality of recessed portions has a side peripheral surface having a predetermined area so as to ensure a predetermined heat dissipation property and a predetermined internal volume so as to ensure a predetermined heat storage amount. 2. The heat storage board according to claim 1, wherein each of the plurality of recessed portions has a regular hexagonal opening on an outer surface and is arranged in a honeycomb shape. A method of manufacturing a heat storage board,
A wire in which a conductor is coated with a thermoplastic resin for one cavity of a pair of split molds that are annularly formed around the cavity and are each provided with a pinch-off portion that protrudes toward the opposing mold. Holding a sheet heating element composed of a sheet-like body;
A step of hanging and positioning the molten thermoplastic resin between the pair of split molds in a form protruding around the cavity of the pair of split molds;
Each molten thermoplastic resin is pressed against a corresponding mold cavity of a pair of divided types, and the sheet heating element held in one cavity is crimped in such a manner that it is embedded in one thermoplastic resin sheet. And a pair of split types so that the pinch-off portions of each of the pair of split molds are brought into contact with each other while forming a concave portion on the surface facing the other cavity of the other thermoplastic resin sheet And clamping the mold of
Thereby, a sealed hollow plate-like body in which the peripheral edge corresponding to the pinch-off part is welded is formed,
Furthermore, filling the heat storage agent through the inlet into the sealed hollow portion of the plate-like body,
And a step of closing the inlet. The shaping step includes a plurality of protrusions provided in the other cavity of the pair of split molds, and a plurality of protrusions having a tapered shape toward the opposing split mold. The method for manufacturing a heat storage board according to claim 5, wherein a plurality of recessed portions corresponding to the plurality of protrusions are formed on the surface of the thermoplastic resin by pressing a corresponding thermoplastic resin. The heat storage board according to claim 5, further comprising a step of forming an annular rib by abutting and welding tip portions of the plurality of recessed portions formed on the surface of the other thermoplastic resin to the one thermoplastic resin. Manufacturing method.

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