JP2591977B2 - Thermal insulation structure and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a heat insulating structure which can be used for containers, refrigerators, etc., or a transport box for refrigerated goods constituted by combining these heat insulating structures. A heat insulating structure to be used, in particular, a heat insulating panel vacuum-formed in a predetermined shape is pressure-bonded to one of two frame plates serving as a mold, and has a heat insulating property in a gap between the heat insulating panel and the remaining frame plate. The present invention relates to a heat insulating structure formed by injecting and filling a foamed resin, and a method for manufacturing the same.

[Conventional technology and its problems]

A so-called “vacuum” is used in which a heat insulating substance made of perlite powder or the like is accommodated in a container formed of a non-permeable sheet, and air in the container is removed under reduced pressure to form a desired panel-shaped heat insulating structure. The heat insulating material "a" (hereinafter abbreviated as "vacuum panel") is conventionally known.

As illustrated in FIGS. 7 and 8, the vacuum panel a is attached to the inner surface on one side of two opposing frame plates (outer plates) 1 ', 2' by a double-sided tape or hot melt. A heat insulating structure is also known in which a filler 3 such as hard urethane foam is injected and foamed into the gap between the vacuum panel a and the outer plate 2 ′ to be filled with a mold adhesive b.

However, many disadvantages have been pointed out in the case of the above-mentioned heat insulating material of the known structure as described below. (1) The vacuum panel a used for the heat insulating structure is made of a pearlite powder having a weak particle surface activity and a cohesive force as a heat insulating material. 6 (a) and 6 (b), the upper and lower surfaces forming a heat insulating structure at best, as illustrated in FIGS. 6 (a) and 6 (b). The degree of parallelism was maintained. (Therefore, both ends are not formed at an acute angle,
It was often formed in an arc shape as illustrated in FIG. 6).

For this reason, when vacuum panels a ... a are mounted on the frame plate 1 ', the distance between the vacuum panels a, a and the distance between the panel a and the end face of the frame plate 1', as shown in FIG. If urethane foam is injected and foamed unless it is attached at least 30 mm to 50 mm apart, there is an air space S (air void) in which urethane foam cannot be injected into the space between the vacuum panels a and a, and heat insulation occurs. Had caused a defect. (Refer to Fig. 8) (2) Despite having an apparently excellent structure composed of an outer plate, a vacuum panel attached to the outer plate, and a foamed resin to fill a space part, as the heat insulating structure,
The insulation performance of the entire heat insulating structure is so remarkable as compared to that of the polyurethane foam alone because the heat insulation performance is reduced due to the generation of the air space S at the butted portion of the vacuum panels. Could not.

(3) In the case where the polyurethane foam is injected and foamed in the step of forming the heat insulating structure, the mold is positioned in the horizontal direction or the vertical direction in order to enhance the injection effect of the foamed resin, depending on the size and shape of the mold, The so-called "handling" operation is often performed while changing the injection method in various ways, but the vacuum panel bonded with a double-sided tape or a hot-melt type adhesive has a weak adhesive force, and peels off from the mold during these operations. In some cases, it was not possible to obtain a completely formed heat insulating structure.

In addition, the urethane foam injected into the gap between the heat-insulating panel and the mold that has been peeled off as described above foams, thereby deforming the outer plate that also serves as the mold, and forming a desired precise shape of the molded heat-insulating structure. In many cases, they could not get their bodies.

(4) The vacuum panel adhered to the frame plate because the adhesive used to integrate the vacuum panel and the frame plate is a non-structural adhesive such as a double-sided tape or a hot-melt type adhesive. Was merely adhered and adhered to the frame, and the vacuum panel could not exhibit any effect as a strength member (reinforcing member for the frame plate) on the outer plate due to its structure.

For this reason, when forming a long heat insulating structure in the conventional structure, it is necessary to form reinforcing ribs or the like at appropriate places on the frame plate, and the portion provided with the reinforcing ribs or the like loses heat insulating performance. In addition to causing a problem, it has been pointed out that the total weight of the heat insulating structure increases due to the attachment of these reinforcing members.

 Etc. is that.

[Object of the invention]

The present invention is intended to address the various problems of the above-described conventional structure. That is, an object of the present invention is to provide a heat insulating structure having a sandwich structure having a very high heat insulating performance with a simple manufacturing means and a method of manufacturing the same.

Further, another object of the present invention is to provide a heat insulating panel (a heat insulating panel serving as a core material of a sandwich structure) incorporated in the heat insulating structure, which can exert an effect as a reinforcing member for an outer plate, and thus has a high strength. An object of the present invention is to provide an extremely excellent heat insulating structure and a method for manufacturing the same.

Still another object of the present invention is to provide a heat insulating structure capable of extremely reducing the total weight of the obtained heat insulating structure, and a method of manufacturing the same.

[Gist of the invention]

The present invention applies a constant pressure to at least one frame plate surface of a frame constituting a mold by making one surface of a heat insulating panel previously formed into a desired constant shape face two frame plates. The main points of the present invention are a heat insulating structure for forming a heat insulating panel by injecting and foaming a rigid urethane foam having a closed cell structure into the mold after firmly adhering to the mold, and a method for producing the same.

〔Example〕

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

The heat insulating structure of the present invention is an outer frame plate 1, 1,
2 formed by vacuum forming in advance and bonded on the frame plate 1 with an adhesive 4 and a filler 3 made of rigid urethane foam.

The outer frame plate 1 is formed by using two metal plates or two synthetic resin plates having a certain thickness, and one outer frame plate serves as a substrate 11 for bonding the molded panel 2, The other outer frame plate is used as a cover plate 12 opposed to the outer frame plate at a predetermined interval.

The vacuum-molded heat-insulating panel 2 is filled with silica powder in an inner bag 21 made of a gas-permeable material such as paper or nonwoven fabric, and then closed at the end of the bag, and then press-pressed. Thus, the press-pressed molded product is housed in a non-breathable outer bag 22 made of a synthetic resin film or the like, and then the inside of the outer bag is evacuated. It is obtained by closing the part.

In this molded heat insulating panel 2, since the heat insulating powder to be used is silica powder having a strong particle surface activity and strong cohesive force among the particles, the shape of the formed panel can be a molded product with extremely high precision.

Further, since the molded heat insulating panel 2 has a high molding accuracy, the extra length (ear portion) 2 generated when forming the outer bag 22 is formed.
The 2 'portion is closely adhered along the shape of the molded product as illustrated in FIG. 1, so that the shape of the molded product is not hindered.

The filler 3 made of hard urethane foam is filled using hard polyurethane foam having a closed cell structure.

 Hereinafter, the manufacturing method will be specifically described.

First Embodiment First, a heat insulating material in which a trapezoidal shape is formed in advance on the upper surface of a substrate 11 formed in a box shape by erecting both side wall portions by a predetermined height, and an adhesive 4 is applied to the back surface. The panels 2 are placed without gaps so that both ends of the bottom face part are close to each other. (See FIG. 2) Then, from the upper surface of the arranged heat insulating panels 2... 2 by a press machine 5 (or an air bag), 0.1 to 0.5 kg / c.
By applying a pressure of m ² , strong integration between the molded heat insulating panels 2... 2 and the substrate 11 is performed. (Refer to FIGS. 4 and 5.) The application mode of the adhesive 4 applied to the back surface of the molded heat insulating panel 2 is not particularly limited, but the adhesive applied in a bead shape as illustrated in FIG. The object of the present invention can be sufficiently achieved by bonding to the front surface.

After the molded heat insulating panels 2 and 2 are firmly adhered to the substrate 11, a box-shaped cover plate 12 is formed on the upper surface of the molded heat insulating panels 2 and 2 by similarly erecting both side walls at a predetermined height. The polyurethane foam resin 3 having a closed cell structure is injected and foamed in a gap between the upper surface of the molded heat insulating panel 2... Fill the gap to obtain a heat insulating structure. (Refer to FIG. 2) Second Embodiment First, a molded heat insulating panel 2 previously formed in a trapezoidal shape is formed on the upper surface of a substrate 11 formed in a box shape by erecting both side wall portions by a predetermined height. .. 2 are arranged so that adjacent panels sequentially repeat front and back, so that the inclined surfaces formed at both ends of the panel are arranged without any gap so as to adhere to each other. (See FIG. 3) In this case, a gap is generated in the contact surface by interposing an adhesive or a fibrous heat insulating agent 6 on the contact surface of the molded heat insulating panels 2 and 2 whose end surfaces are in contact with each other by being adjacent to each other. To prevent them from doing so.

When the molded heat insulating panels 2 are arranged on the surface of the substrate 11 as described above, the adhesive 4 is applied in advance to the surface of the molded heat insulating panels 2.

Then, from the upper surface of the arranged heat insulating panels 2... 2 by a press machine 5 (or air bag), 0.1 to 0.5 kg / c.
By applying a pressure of m ² , strong integration between the molded heat insulating panels 2... 2 and the substrate 11 is performed. (Refer to FIGS. 4 and 5) As in the first embodiment, the application mode of the adhesive 4 applied to the rear surface of the molded heat insulating panel 2 is not particularly limited, but as illustrated in FIG. The object of the present invention can be sufficiently achieved by applying the pressure applied to the substrate.

After firmly adhering the molded heat insulating panels 2 to the surface of the substrate 11, a box-shaped cover plate 12 is formed on the upper surface of the formed heat insulating panels 2 by also raising both side walls at a predetermined height. After being positioned at a fixed interval, the polyurethane foam resin 3 having a closed cell structure is injected and foamed into the gap between the upper surface of the molded heat insulating panels 2. The gap was filled to obtain a heat insulating structure.

Third Embodiment First, by forming the side wall portions at both ends slightly higher than the height of the molded heat insulating panels 2... 2, the trapezoidal shaped heat insulating preformed on the upper surface of the substrate 11 formed in a box shape. Panels 2 are arranged without gaps. (It has the same form as the lower half of FIG. 2.) The arrangement form of the molded heat insulating panels 2... 2 is arranged such that the adjacent panels repeat the front and back sequentially in the same manner as the arrangement in the second embodiment. In such a case, the inclined surfaces formed at both ends of these panels are arranged without a gap so as to adhere to each other. (The same mode as the lower half portion in the example illustrated in FIG. 3 is used.) In addition, an adhesive or a fibrous heat insulating agent 6 is interposed between the contact surfaces of the formed heat insulating panels 2 and 2 that are adjacent to each other and contact each other. This prevents the occurrence of a gap in the contact surface.

When the molded heat insulating panels 2 are arranged on the surface of the substrate 11, a desired amount of the adhesive 4 is applied in advance to the surface of the molded heat insulating panels 2 that are in contact with the substrate 11.

Then, from the upper surface of the arranged heat insulating panels 2... 2 by a press machine 4 (or an air bag), 0.1 to 0.5 kg / c.
By applying a pressure of m ² , strong integration between the molded heat insulating panels 2... 2 and the substrate 11 is performed. (See FIGS. 4 and 5) As in the first and second embodiments, the application mode of the adhesive 4 applied to the back surface of the molded heat insulating panel 2 is not particularly limited, but is exemplified in FIG. The object of the present invention can be sufficiently achieved by applying a pressure-applied material that has been applied in the form of a beat.

After assembling the two sets of substrates 11 and 11 formed as described above such that the bonding surfaces of the molded heat insulating panels 2... 2 face inward, they are formed in the middle of the two sets of molded heat insulating panels 2. By injecting and foaming the polyurethane foam resin 3 having a closed-cell structure into the space thus formed, and filling the gap, a heat-insulating structure in which layers of molded heat-insulating panels were formed on the inner surfaces on both sides could be obtained.

〔The invention's effect〕

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

(1) Unlike the conventional structure, the molded heat insulating panel 2 ...
2 is firmly pressed against the surface of the substrate 11, so that when the filler 3 using urethane foam is injected and foamed, the molded heat insulating panels 2... The fear can be completely eliminated, and various troubles caused by peeling of the molded heat insulating panel can be completely eliminated.

(2) In the case of the conventional structure, the molded heat insulating panel stuck to the substrate surface was merely adhered to the substrate surface, and could not exhibit the effect as a structural strength member. Therefore, in the case of the conventional structure, in the case of a long heat insulating structure, a reinforcing member (such as a reinforcing rib) is separately provided on the outer frame plate.
Had to be attached, but in the case of the present invention, the substrate
The molded heat-insulating panels 2... 2 firmly pressed on the surface of the eleventh surface exert the effect as a structural reinforcing material (reinforcing rib) in addition to the effect as a heat-insulating member.

As a result, the disadvantage of increasing the manufacturing cost due to the attachment of a separate reinforcing member to the outer frame plate 1 has been eliminated, which has contributed to the cost reduction of the product, as well as to the demand for a lighter product. It has an excellent effect that it can be performed.

(3) The use of a silica-based powder having a strong particle surface activity and a strong cohesive force among the particles inside the formed heat insulating panels 2... 2 facilitates the forming of the formed heat insulating panels 2. As a result, the molded heat insulating panels 2 arranged on the substrate 11
... Completely eliminates the generation of gaps between 2 and the surface of the substrate 11 and the generation of air voids caused by the gaps between joints between the heat insulating panels, and provides a composite having the desired heat insulating performance and perfect shape. A heat insulating structure can now be obtained.

(4) The molded heat-insulating structure obtained by the present invention can be used as a heat-insulating structure for containers, refrigerated warehouses, and the like. There are also many uses such as forming as.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a molded heat insulating panel used in an embodiment of the present invention, FIG. 2 is a partially omitted sectional view showing a first manufacturing method, and FIG. 3 is a sectional view showing a second manufacturing method. FIG. 4 is a cross-sectional view showing a means for crimping the molded heat-insulating panel substrate, FIG. 5 is a cross-sectional view showing a state at the time of completion of bonding, and FIG. FIG. 7B is a cross-sectional view showing the heat insulating panel, FIG. 7B is a cross-sectional view showing a state where the extra length of the outer bag in the same figure is bent, FIG. 7 is a cross-sectional view showing a heat insulating structure according to the conventional method, and FIG. FIG. 4 is a cross-sectional view showing a state in which formed heat insulating panels are arranged close to each other by a heat insulating structure according to the present invention. 1 ... outer frame plate, 11 ... substrate, 12 ... cover plate, 2 ... molded heat insulating panel, 21 ... inner bag, 22 ... outer bag, 22 '... extra length,
3 ... filler, 4 ... adhesive, 5 ... press machine, 6 ...
Fibrous insulation

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location B32B 27/40 B32B 27/40

Claims (2)

(57) [Claims] An inside surface of at least one of two frame plates arranged to face each other at a predetermined interval is provided with a heat insulating panel formed in a predetermined shape in a predetermined shape at a predetermined pressure. And a rigid urethane foam having a closed cell structure is injected and foamed in the space between the two frame plates. 2. An inner surface of at least one of the frame plates constituting a frame by facing two frame plates,
After pressing the molded heat insulating panel with the adhesive applied to the back side firmly by a press machine, etc., then, at a certain interval, on this frame plate, after positioning the other frame plate to be the opposite surface, A method for manufacturing a heat insulating structure, characterized by injecting and foaming a filler such as hard urethane foam having a closed cell structure into a space between two opposing frame plates.