JP2004223759A - Method for manufacturing heat insulating board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problem : a conventional heat insulating board is inferior in production efficiency, increased in production cost, easy to cause foaming irregularity, increased in its weight and the heat insulating capacity of the heat insulating board is made impossible to act effectively. <P>SOLUTION: This manufacturing method for the heat insulating board includes a step for supplying a chemical liquid used for forming a foamed heat insulating layer 15 onto a back sheet 3, a step for placing a vacuum heat insulating member 14 on the back sheet 13 to which the chemical liquid is supplied, a step for further supplying the chemical liquid onto the back sheet 13 to which the chemical liquid is supplied and the vacuum heat insulating member 14, a step for superposing a top sheet 12 on the back sheet 13 to which the chemical liquid is supplied and the vacuum heat insulating member 14, a step for foaming the chemical liquid to form the foamed heat insulating layer for covering the vacuum heat insulating member between the back sheet 13 and the top sheet 12 and a step for regulating the interval between the back sheet 13 and the top sheet 12 almost constant during the foaming of the chemical liquid to control the thickness of the foamed heat insulating layer 15. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a heat insulating board that is lightweight, inexpensive, and has good heat insulating performance.
[0002]
[Prior art]
In vending machines for various beverages, it is required to keep the products stored inside at an appropriate temperature, so it is necessary to line the housing and partition walls with urethane foam resin with excellent heat insulation. It has become common. In particular, in vending machines that simultaneously handle products that are preferably cooled and products that are preferably heated, it is necessary to minimize the heat transfer between these products. Separated partition walls are incorporated inside to separate them.
[0003]
A conventional heat insulating board incorporating a vacuum heat insulating member, as disclosed in Patent Documents 1 and 2, surrounds a foam heat insulating member in which a vacuum heat insulating member is embedded with a side cover, and surrounds these with a metal back cover and a top. In general, a structure in which it is sandwiched between covers is used. Such a conventional heat-insulating board has a vacuum heat-insulating member mounted on a back cover via a spacer and a side cover disposed on a peripheral portion of the back cover to seal a gap between the side covers. The top cover is superimposed on the side cover so as to cover the side cover, and a chemical solution serving as a foamed heat insulating member is injected from a filling hole formed in the side cover into a space in which the vacuum heat insulating member is stored, and the inside of the space is formed with a foamed heat insulating member In this case, an integral foam molding method is used.
[0004]
[Patent Document 1]
JP-A-11-166688 [0005]
[Patent Document 2]
Japanese Patent Publication No. 4-12220
[Problems to be solved by the invention]
The integrated foam molding method used in the production of conventional insulation boards takes time to set up the vacuum insulation member and seal the gap between the side covers, etc. However, there is a disadvantage that the product cost increases. In addition, since a chemical solution is injected into the closed narrow space and foamed, the foaming unevenness is likely to occur, and it may not be possible to obtain the designed heat insulating property. Moreover, since it is necessary to use a spacer for positioning the vacuum heat insulating member between the back cover and the top cover, there is a possibility that the heat insulating performance at the spacer portion is impaired. Furthermore, since the back cover and the top cover are formed of a metal plate, the weight of the heat insulating board increases, and since these also function as heat transfer members, the heat insulating performance of the heat insulating board, particularly, a part of the heat insulating board, In some cases, the function of the built-in vacuum heat insulating member cannot be effectively operated.
[0007]
[Object of the invention]
SUMMARY OF THE INVENTION An object of the present invention is to provide a method capable of easily and continuously producing an inexpensive heat insulating board having good heat insulating performance and lower cost than conventional ones.
[0008]
[Means for Solving the Problems]
According to a first aspect of the present invention, a step of mounting a vacuum heat insulating member on a back sheet, a step of supplying a chemical solution for forming a foamed heat insulating layer on the back sheet and the vacuum heat insulating member, Superimposing a topsheet on the supplied backsheet and the vacuum heat insulating member, and forming the foamed heat insulating layer between the backsheet and the topsheet by foaming the chemical solution; Controlling the thickness of the foamed heat insulating layer by regulating the distance between the back sheet and the top sheet to be substantially constant during the foaming of the chemical solution.
[0009]
In the present invention, the vacuum heat insulating member is placed on the back sheet, a chemical solution is supplied thereon, and the top sheet is further stacked on the back sheet and the vacuum heat insulating member. At the same time as forming between the sheet and the top sheet, the gap between the back sheet and the top sheet is regulated to be almost constant and the thickness of the foam heat insulating layer is adjusted to be constant, so that the foam is formed between the top sheet and the back sheet. A heat insulating board having a heat insulating layer and a vacuum heat insulating member surrounded by the foam heat insulating layer and the back sheet is formed.
[0010]
According to a second embodiment of the present invention, there is provided a step of supplying a chemical solution on a back sheet, a step of placing a vacuum heat insulating member on the back sheet to which the chemical solution is supplied, and the back sheet to which the chemical solution is supplied. And further supplying the chemical solution on the vacuum heat insulating member; laminating a top sheet on the back sheet and the vacuum heat insulating member to which the chemical solution is supplied; Forming a foam heat insulating layer covering the member between the back sheet and the top sheet; and controlling the gap between the back sheet and the top sheet to be substantially constant during foaming of the chemical solution, thereby forming the foam heat insulating layer. Controlling the thickness of the heat insulating board.
[0011]
In the present invention, a chemical solution is supplied on the back sheet, a vacuum heat insulating member is further placed thereon, and the chemical solution is further supplied on the back sheet and the vacuum heat insulating member to which the chemical solution has been supplied, so that the back sheet and the vacuum heat insulating member are provided. A top sheet is further stacked on the member, and a chemical solution is foamed to form a foam heat insulating layer covering the vacuum heat insulating member between the back sheet and the top sheet, and at the same time, regulates a substantially constant gap between the back sheet and the top sheet. By adjusting the thickness of the foam heat insulating layer to a constant value, a heat insulating board having a foam heat insulating layer between the top sheet and the back sheet and a vacuum heat insulating member covered with the foam heat insulating layer is formed.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
The method for manufacturing a heat insulating board according to the first and second aspects of the present invention may further include a step of interposing a heat transfer plate between the back sheet and the vacuum heat insulating member. In this case, the heat transfer plate may be approximately the same size as the vacuum heat insulating member or have a smaller size.
[0013]
The method may further include a step of cutting the back sheet and the top sheet into a predetermined shape together with the foamed heat insulating layer.
[0014]
The back sheet and the top sheet may be formed in a web shape to be continuously supplied, and the chemical liquid may be continuously supplied according to the supply of the back sheet.
[0015]
The backsheet and the topsheet can be formed of a non-metallic material.
[0016]
The foam heat insulating layer can be formed of a hard urethane resin.
[0017]
The vacuum heat insulating member may include a package whose inside is kept in a vacuum and a porous member housed inside the package. In this case, the package can be formed of a gas-impermeable resin film or a laminated film formed by laminating a metal foil such as aluminum and a resin film.
[0018]
【Example】
Embodiments in which the method for manufacturing a heat insulating board according to the present invention is applied to a partition wall incorporated in a vending machine will be described in detail with reference to FIGS. 1 to 5, but the present invention is not limited to these embodiments. And any changes and modifications encompassed by the concept of the present invention described in the claims of this specification can be made, and therefore, any other technology belonging to the spirit of the present invention can be applied. Of course can also be applied.
[0019]
FIG. 1 shows the appearance of the partition wall to which the present invention is applied in a broken state, and FIG. 2 shows its cross-sectional structure taken along the line II-II. That is, the partition wall 10 has a substantially rectangular plate shape having a thickness of, for example, about 10 mm, and a cutout portion 11 for passing a wire harness (not shown) incorporated in a vending machine is formed at one corner thereof. Have been. The illustrated partition wall 10 accommodates a non-metallic top sheet 12, a non-metallic back sheet 13 facing the top sheet 12 with a gap, and a space between the top sheet 12 and the back sheet 13. And a foam insulation member 15 filled between the top sheet 12 and the back sheet 13 so as to surround the vacuum insulation member 14.
[0020]
The top sheet 12 and the back sheet 13 are formed of paper or a resin film. The vacuum heat insulating member 14 having a thickness of, for example, about 5 to 8.5 mm is housed inside the package 14a whose inside is kept at a vacuum of about 10 ⁻² to 10 ⁻³ torr, for example. And a porous member 14b. The package 14a of the vacuum heat insulating member 14 is formed of a gas-impermeable laminated film in which a high-density polyethylene film, an aluminum foil, an aluminum vapor-deposited polyethylene terephthalate film, and a polyamide (nylon) film are laminated in this order from the inside. It is folded in two so as to sandwich the quality member 14b, and has a flange-shaped heat seal portion 14c surrounding the periphery. The foamed heat insulating member 15 is formed of a two-liquid mixed type foamed hard urethane resin composed of a polyol and an isocyanate as a curing agent thereof.
[0021]
An example of an apparatus for manufacturing such a partition wall 10 is conceptually shown in FIG. That is, the back sheet coil 13 ′ wound into a coil shape to be the back sheet 13 is mounted on the first feeding roller 21, fed out at a predetermined speed, and sent out onto the main conveyor 23 via the direction changing roller 22. It is. On the upstream side (left side in FIG. 3) of the main conveyor 23, a first chemical liquid injection nozzle 24 and a second chemical liquid injection nozzle 25 for respectively injecting a chemical liquid obtained by previously mixing a polyol and an isocyanate at a predetermined ratio. Are arranged at a distance from each other along the conveying direction of the main conveyor 23. A plurality of these chemical spray nozzles 24 and 25 are provided along the width direction of the main conveyor 23, respectively. The first chemical spray nozzle 24 uniformly sprays the above-described chemical on the back sheet 13, and the second chemical spray nozzle The nozzle 25 can spray a chemical solution onto the back sheet 13 from above the vacuum heat insulating member 14 as described later.
[0022]
Between the first chemical liquid spray nozzle 24 and the second chemical liquid spray nozzle 25, the vacuum heat insulating member 14 is placed on the foam heat insulating member 15 which is sprayed onto the back sheet 13 from the first chemical liquid spray nozzle 25 and is in the process of foaming. A vacuum heat insulating member mounting portion 26 to be mounted is set, and a pressing conveyor 27 is provided downstream of the main conveyor 23 at a predetermined interval from the main conveyor 23. The lengths of these two conveyors 23 and 29 are set so that the process of completing the foaming of the foam insulation member 15 between the main conveyor 23 and the pressing conveyor 27 and leading to curing is performed.
[0023]
The top sheet coil 12 ′ wound into a coil shape to be the top sheet 12 is mounted on a second feed roller 28, is fed at a predetermined speed equal to that of the main conveyor 23, and has a second chemical liquid spray nozzle 25 and a pressing conveyor 27. And is sent out directly below the presser conveyor 27 via a second direction change roller 29 disposed between them.
[0024]
The chemical liquid sprayed onto the back sheet 13 by the first and second chemical liquid spray nozzles 24 and 25 immediately starts foaming and swells so that the vacuum heat insulating member 14 is located between the back sheet 13 and the top sheet 12. Swelling in the vertical direction is regulated by the main conveyor 23 and the presser conveyor 27, and the swelling state spreads forward, backward, left and right along the conveying surface of the main conveyor 23.
[0025]
Between the main conveyor 23 and the separation conveyor 30 following the main conveyor 23, a pair of upper and lower cutters 31 for cutting the foamed partition wall material at predetermined intervals, and a main conveyor 23 and a pressing conveyor 27 are provided. A pair of left and right slitters (not shown) for cutting and removing both side edges of the partition wall material sent out from between is provided. Although the pair of upper and lower cutters 31 in this embodiment is of a shearing type, it is of course possible to adopt a rotary type cutter that runs in the width direction of the conveyors 23, 30.
[0026]
A pair of left and right dam plates (not shown) is moved between the main conveyor 23 and the pressing conveyor so that the foamed heat insulating member 15 does not protrude from both left and right ends of the back sheet 13 and the top sheet 12 passing between the main conveyor 23 and the pressing conveyor 27. In the case where it is disposed at the left and right side edge portions of the right and left sides 27, the above-mentioned pair of left and right slitters can be omitted.
[0027]
The transport speed of the separation conveyor 30 is set higher than that of the main conveyor 23, and the partition wall materials 10 'cut by the cutter 31 move on the separation conveyor 30 with a gap therebetween. Further, the notch 11 is cut by the notch forming cutter (not shown) on the partition wall material 10 ′ on the separation conveyor 30, and the partition wall 10 thus manufactured is placed on a pallet (not shown). Are sequentially stacked.
[0028]
In the above-described embodiment, the vacuum heat insulating member 14 is disposed between the top sheet 12 and the back sheet 13, and the foam heat insulating member 15 is interposed between the vacuum heat insulating member 14, the top sheet 12 and the back sheet 13. In a case where a local heat load acts on a part of the partition wall 10, a structure in which a metal plate for heat transfer is stacked on the vacuum heat insulating member 14 to effectively use the vacuum heat insulating member 14 is adopted. It is valid.
[0029]
FIG. 4 shows a cross-sectional structure of another embodiment of such a partition wall. Elements having the same functions as those of the previous embodiment are denoted by the same reference numerals, and overlapping description will be omitted. . That is, the heat transfer plate 16 that is in contact with the back sheet 13 and the vacuum heat insulating member 14 is interposed. The heat transfer plate 16 has substantially the same size as the porous member 14b of the vacuum heat insulating member 14, but may have a smaller size than the porous member 14b.
[0030]
An example of an apparatus for manufacturing the partition wall 10 shown in FIG. 4 is conceptually shown in FIG. 5, but elements having the same functions as those in the previous embodiment are denoted by the same reference numerals, and overlapping descriptions will be omitted. It shall be omitted. That is, on the upstream side (left side in FIG. 3) of the main conveyor 23, a heat transfer plate mounting portion 32 for mounting the heat transfer plate 16 on the back sheet 13 and the vacuum heat insulating member 14 on the heat transfer plate 16. And a vacuum heat insulating member mounting portion 26 on which are stacked.
[0031]
Between the press conveyor 27 and the vacuum heat insulating member mounting section 26, a plurality of chemical liquid injection nozzles 33 for respectively injecting a chemical liquid in which polyol and isocyanate are mixed at a predetermined ratio in advance are provided above the main conveyor 23. Are located in
[0032]
Therefore, the chemical liquid sprayed onto the back sheet 13 by the chemical liquid spray nozzle 33 immediately starts foaming, swells so as to surround the heat transfer plate 16 and the vacuum heat insulating member 14 and comes into contact with the top sheet 12, and the main conveyor 23 and the pressing conveyor The swelling in the vertical direction is regulated by 27, and the swelling state spreads forward, backward, left and right along the conveying surface of the main conveyor 23. The foamed partition wall material 10 ′ is cut by the cutter 31, and the cutout 11 is cut on the separation conveyor 30, and is sequentially stacked on a pallet (not shown).
[0033]
【The invention's effect】
According to the first method for manufacturing a heat insulating board of the present invention, a chemical solution for forming a foam heat insulating layer and a vacuum heat insulating member are supplied between a top sheet and a back sheet, and the chemical solution is foamed to form a foam heat insulating layer. Is formed between the back sheet and the top sheet, and at the same time, the gap between the back sheet and the top sheet is regulated to be substantially constant, and the thickness of the foamed heat insulating layer is adjusted to be constant. In addition, a lightweight heat insulating board having high heat insulating performance and having a foam heat insulating layer and a vacuum heat insulating member surrounded by the foam heat insulating layer and the back sheet can be manufactured easily and at low cost.
[0034]
According to the second method for manufacturing a heat insulating board of the present invention, a heat insulating board having good heat insulating performance, comprising a foam heat insulating layer between a top sheet and a back sheet, and a vacuum heat insulating member covered with the foam heat insulating layer. Can be manufactured easily and at low cost.
[0035]
When a step of interposing a heat transfer plate between the back sheet and the vacuum heat insulating member is further provided, the vacuum heat insulating member can be used more effectively even when a local heat load acts on the heat insulating board. . In particular, when a metal plate is adopted as the heat transfer plate, it can also function as a protection member for preventing damage to the vacuum heat insulating member.
[0036]
If the method further comprises a step of cutting the back sheet and the top sheet into a predetermined shape together with the foamed heat insulating layer, a heat insulating board having a desired contour shape can be obtained.
[0037]
When the back sheet and the top sheet are each in the form of a web that is continuously supplied, and the chemical solution is continuously supplied according to the supply of the back sheet, a long insulating board of any length can be continuously manufactured. it can.
[0038]
When the back sheet and the top sheet are formed of a nonmetallic material, the weight of the heat insulating board can be reduced, and the heat insulating performance can be improved.
[Brief description of the drawings]
FIG. 1 is a cutaway plan view showing the appearance of a heat insulating board to which the present invention is applied.
FIG. 2 is a sectional view taken along the line II-II in FIG.
FIG. 3 is a schematic diagram showing a schematic configuration of an apparatus capable of manufacturing the heat insulating board shown in FIGS. 1 and 2.
FIG. 4 is a cross-sectional view illustrating another structure of the heat insulating board targeted by the present invention.
FIG. 5 is a schematic diagram illustrating a schematic configuration of an apparatus capable of manufacturing the heat insulating board illustrated in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Partition wall 10 'Partition wall material 11 Notch 12 Top sheet 12' Top sheet coil 13 Back sheet 13 'Back sheet coil 14 Vacuum insulation member 14a Packaging 14b Porous member 14c Heat seal part 15 Foam insulation member 16 Heat transfer Plate 21 ′ First feed roller 22 Direction change roller 23 Main conveyor 24, 25 Chemical liquid spray nozzle 26 Vacuum insulation member mounting section 27 Holding conveyor 28 Second feed roller 29 Direction change roller 30 Separate conveyor 31 Cutter 32 Heat transfer plate Mounting part 33 Chemical liquid injection nozzle

Claims (7)

Placing a vacuum insulation member on the back sheet;
Supplying a chemical solution for forming a foamed heat insulating layer on the back sheet and the vacuum heat insulating member,
A step of stacking a top sheet on the back sheet and the vacuum heat insulating member to which the chemical is supplied,
Forming the foam insulation layer between the back sheet and the top sheet by foaming the chemical solution;
Controlling the thickness of the foamed heat insulating layer by regulating the distance between the back sheet and the top sheet to be substantially constant during the foaming of the chemical solution. Supplying a chemical solution for forming a foam insulation layer on the back sheet;
Placing a vacuum heat insulating member on the back sheet to which the chemical is supplied,
Further supplying the chemical solution on the back sheet and the vacuum insulating member to which the chemical solution has been supplied,
A step of stacking a top sheet on the back sheet and the vacuum heat insulating member to which the chemical is supplied,
Forming a foam insulation layer covering the vacuum insulation member between the back sheet and the top sheet by foaming the chemical solution;
Controlling the thickness of the foamed heat insulating layer by regulating the distance between the back sheet and the top sheet to be substantially constant during the foaming of the chemical solution. The method according to claim 1 or 2, further comprising a step of interposing a heat transfer plate between the back sheet and the vacuum heat insulating member. The method for manufacturing a heat insulating board according to any one of claims 1 to 3, further comprising a step of cutting the back sheet and the top sheet together with the foamed heat insulating layer into a predetermined shape. The said back sheet and the said top sheet are each in the form of a web supplied continuously, and the chemical | medical solution is supplied continuously according to the supply of the said back sheet, The Claim 1 characterized by the above-mentioned. 3. The method for producing a heat insulating board according to claim 1. The method according to claim 1, wherein the back sheet and the top sheet are formed of a non-metallic material. The method for manufacturing a heat insulating board according to any one of claims 1 to 6, wherein the foam heat insulating layer is formed of a hard urethane resin.

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