JP2694356B2 - Insulation structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a heat insulating structure that can be used in containers, refrigerators, etc., or a combination of these heat insulating structures in a box shape for refrigerated products and frozen products. The present invention relates to a heat insulating structure that can be applied to a low temperature transportation box or the like for transporting the like.

[Conventional technology and its problems]

An aluminum foil laminate layer is formed in advance on one surface of a sheet made of a synthetic resin thin film, or a synthetic resin film having an aluminum vapor deposition layer formed thereon (hereinafter collectively referred to as a metal vapor deposition film) is laminated. By forming a synthetic resin film having a barrier property (gas barrier property) against air or water vapor by using this, a synthetic resin film having this gas barrier property is used to obtain a container of a certain shape and It is possible to form a heat insulating structure having a desired shape by accommodating a heat insulating material composed of pearlite powder, silica fine powder and the like preformed in a certain shape, and then removing the air in the container under reduced pressure. It is known by abbreviated as "vacuum panel".

However, in the case of the known heat insulating structure described above,
The thickness of the synthetic resin thin film that constitutes the container is 100-200 at best.
It is pointed out that the strength of the film is inferior because it uses a micron-sized film, and if an object from the outside strongly touches the vacuum panel, the film is easily damaged and the internal vacuum cannot be maintained, and the heat insulation performance deteriorates. It had been.

In addition, since the vacuum panel is made of only synthetic resin film, it cannot be fixed with tightening tools such as screws or bolts even when trying to form a heat insulating layer on the wall surface, etc. It was only possible to fix it with a glue or an adhesive.

As a means for solving these problems and solving them, the above-mentioned vacuum panel is provided with two outer walls (surface materials) made of metal, FRP or the like, to which the above-mentioned vacuum panel is attached by using a double-sided tape or an adhesive. Face each other inwardly, and form a composite panel by filling and foaming polyurethane foam or the like in the gap between the two facing vacuum panels, and fixing the composite panel to the heat-insulated surface. The means of doing is adopted.

However, the finish accuracy of the vacuum panel used for this is at most millimeters, and the finished dimensions of the manufactured vacuum panel are inferior in accuracy, and it is pointed out that the adhesion (familiarity) with the surface material that becomes the outer wall deteriorates. Was there.

In addition, the vacuum panel thus formed has a narrow extra length portion (ears) formed by the overlapped portion of the synthetic resin film at the peripheral edge portion (four peripheral portions) of the panel body at the time of manufacturing, but as a composite panel. In order to form the heat insulating pulses, the narrow extra length portions (ears) are bent along the peripheral shape of the heat insulating material main body in order to improve the adhesion between the heat insulating pulses, and the bent portions are heat-insulated with tape or the like ( Vacuum panel body)
It has also been pointed out that the manufacturing cost rises because a large number of vacuum panels have to be arranged after being fixed to the surface.

Furthermore, the vacuum panel manufactured by the conventional method has a size of 45 sheets because of its airtightness and low reliability.
Since we were only able to manufacture cm x 45 cm square pieces, it was necessary to combine a number of vacuum panels in order to manufacture a large heat insulation panel, and this made the composite panel more accurate. Was inferior in terms of performance.

[Object of the invention]

The present invention is intended to effectively cope with the above-mentioned disadvantages of the conventional structure.

That is, the present invention (1) makes it possible to eliminate the need for using an outer plate (face plate) composed of FRP, a thin metal plate, etc., which is required in the conventional structure, when manufacturing a composite panel. Provide a heat insulating structure.

(2) It is possible to attach fixing tools such as fixing screws and bolts to the heat insulating structure itself, whereby a large number of heat insulating structures can be directly arranged and fixed to the heat insulating wall surface and the like. A heat insulating structure is provided.

(3) It is possible to completely omit the work required in the conventional structure of closing the gap between the heat insulating structures by the filling and foaming of the polyurethane foam.

(4) It enables the manufacture of large composite panels.

The purpose is to do so.

[Gist of the invention]

The present invention is a molded heat-insulating material which is formed in a desired shape in advance after housing a powder having heat-insulating properties in a container having air permeability such as paper or nonwoven fabric, and a container body which houses the molded heat-insulating material, It consists of a combination with a lid plate that can hold the molded heat insulating material in an airtight manner by evacuating the inside of the container main body containing the molded heat insulating material and then closing this opening. It is composed of a synthetic resin thin plate with a thickness that can fix screws and bolts of
In addition, the structure of the heat insulating structure in which the container body and the lid plate are integrated by the heat welding means is the gist of the invention.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The heat insulating structure of the present invention includes a container body 1 and the container body 1.
And the molded heat insulating material 2 that is hermetically housed inside.

The molded heat insulating material 2 is a powder having heat insulating properties inside the container 21.
It is formed by pressing a material filled with 22 into a desired shape.

The container 21 is formed in a bag shape using a material having air permeability such as kraft paper or nonwoven fabric, and the container 21 formed in the bag shape has a heat insulating powder 22 such as fine silica particles inside. After being filled with a predetermined amount, the container 21 with the end opening sealed is press-molded in a mold (not shown) having the same shape as the container body 1.

The powder having the heat insulating property is not limited to the finely powdered silica described above, and perlite, silica, diatomaceous earth, shirasu, titania, calcium silicate, magnesium carbonate, graphite, activated carbon and the like can be used.

Although not shown, an infrared or far infrared absorber or a vapor adsorbent such as water vapor or freon is added to the heat-insulating powder 22 housed inside the molded heat insulating material 2, if necessary. You are also free to do so.

Fe ₃ O ₄ as an infrared or far-infrared-absorbing material is added to a powder having a heat insulating _{property, TiO 2, Cr 2 O 3} , MgO, oxides such as Al ₂ O ₃ or Al (OH) _3, such as hydroxide , Carbides such as SiC, and fine powders such as graphite.

Further, as the gas adsorbent, synthetic zeolite, activated carbon, molecular sieving carbon, etc. are effective.

The container body 1 is formed of a thin plate of synthetic resin such as polyvinyl chloride into a shallow dish shape with an open upper surface.
An aluminum foil 3 is integrally laminated on the bottom plate surface of the housing 11 for housing the molded heat insulating material 2 to form a gas barrier layer.

The means for forming the gas barrier layer can be achieved not only by forming a laminate layer using the aluminum foil 3 described above but also by laminating a synthetic resin film on which a metal or a metal oxide is deposited. it can.

Further, the gas barrier layer formed by laminating metal foil or vapor deposition of metal or metal oxide is a container body 1.
It may be provided on the entire surface of the above, or may be formed on a part thereof as shown in the embodiment.

Reference numeral 12 denotes a lid plate for closing the opening surface of the container body 1, which is made of a synthetic resin film or thin plate, and a gas barrier layer 13 such as an aluminum foil is integrally formed on the back surface. ing.

The lid plate 12 can be formed of a single synthetic resin thin plate having an appropriate thickness, but is also formed as a single plate-like body by laminating thin synthetic resin films in multiple layers. It is also possible to use the prepared one.

It should be noted that the lid plate 12 is not limited to the case where it is formed of one synthetic resin thin plate, and the case where the lid plate 12 is formed by laminating a large number of synthetic resin films in multiple layers.
The material forming the back surface (the surface contacting the container body 1) needs to be formed of the same material as the container body 1 so that both can be heat-welded.

The synthetic resin used for the container body 1 and the cover plate 12 may be any one as long as it is a thermoplastic resin, and examples thereof include vinyl chloride, polyethylene terephthalate, polyamide, polyolefin, polystyrene and Teflon.

Example 1 Using a thin plate of polyvinyl chloride resin having a thickness of 2 mm, a container body 1 having a square shape with a side length of 70 cm, a height of 2 cm, and a flange portion protruding length of 5 cm was formed.

Kraft paper is used to fill the inside of a bag-shaped container 21 having a size that can be stored inside the container body 1 with finely divided silica 22 and after closing the opening, it has the same shape as the container body 1. After being housed in the mold and pressure-molded, it was dried in a dryer to dry the finely divided silica.

After the molded heat insulating material 2 that has been pressure-molded is housed inside the container body 1, the container body 1 is evacuated to 0.11 Torr in a vacuum container and the container body 1 is covered with a lid plate 12 having an aluminum vapor deposition layer formed on its back surface. The opening surface of was closed, and both were integrated by heat welding to obtain a molded heat insulator.

The heat insulation resistance of the molded heat insulator obtained by the above method was measured by the method according to JIS A1414, and the apparent thermal conductivity was measured, which was 0.0060 Kcal / mh ° C, which is about the same level as the conventional vacuum panel. Results were obtained.

In addition, this structure is a high temperature of 40 ℃, humidity of 90%,
After being left under high water vapor for 30 days, the thermal conductivity was measured by the same measuring means as above, and it was possible to maintain the same excellent value as the initial performance.

The effects of the present invention configured as described above are as follows.

(1) Since the molded heat insulating material 2 is configured to be housed in the container body 1 made of synthetic resin, it is possible to finish the shape of the entire heat insulating body with extremely high precision, and compared with the conventional composite panel. It has become possible to obtain a remarkably excellent molded heat insulator.

Further, by forming the molded heat insulating material 2 in the container body 1 made of a synthetic resin thin plate, the molded heat insulating material 2 is always protected by the container body 1, and the conventional molded heat insulating body holds it. I was able to completely eliminate the fear of damage.

(2) Since the container body 1 made of a synthetic resin thin plate is used for the container body 1, it is not necessary to use a panel or the like as a surface material like a known composite heat insulating material, and the structure can be simplified. Became.

(3) Since the obtained molded heat insulator can be directly attached with fixing tools such as fixing screws and fixing bolts to the container body 1 serving as the outer shell, it is formed on the surface to be insulated (target surface). The heat insulator can now be fixed and used.

(4) In the case of the conventional molded heat insulating material, it was possible to obtain only a panel with a size of at most 40 cm × 40 cm per sheet, but according to the present invention, the length of one side is 1 meter. It has become possible to manufacture such large rectangular panels without reducing their performance.

(5) Since the molded heat insulating material 2 is tightly housed in the container main body 1, it is possible to omit the trouble of filling the foamed portion with polyurethane foam and foaming it, which simplifies the manufacturing means and reduces the manufacturing cost. It was possible to contribute to cost reduction.

(6) Needless to say, the molded heat insulating structure obtained by the present invention can be used as a heat insulating structure for various containers, refrigerating warehouses, etc., and by transporting refrigerated goods by appropriately combining these heat insulating structures. It can be formed as a composite structure such as a box and has many uses.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, and FIG. 1 is a sectional view,
FIG. 2 is a developed perspective view in which each structural body is shown separately. 1 ... container body, 12 ... lid plate, 2 ... molded heat insulating material, 21 ...
… Container, 22 …… Insulating powder, 3 …… Aluminum foil

Claims (2)

(57) [Claims] 1. A molded heat insulating material which is formed into a desired shape in advance after containing a powder having heat insulating properties in a breathable container such as paper or non-woven fabric, and a container body which houses this molded heat insulating material. , A combination of a lid plate capable of hermetically holding the molded heat insulating material by evacuating the inside of the container main body containing the molded heat insulating material and then closing this opening, and fixing the container main body It is composed of a synthetic resin thin plate with a thickness that can fix screws and bolts for
In addition, the heat insulating structure in which the container body and the cover plate are integrated by a heat welding means. 2. The lid plate is composed of a synthetic resin film or a synthetic resin thin plate made of the same material as the container body at least on the surface in contact with the container body, and the contact surface between the container body and the lid plate is heat welding means. The heat insulating structure according to claim 1, which is integrated by welding.