JP2005172120A - Vacuum heat insulating panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent vacuum break from occurring even if a crest is generated caused by wrinkle at a corner part of a vacuum heat insulating panel at the time of vacuuming for vacuum sealing by making the crest small. <P>SOLUTION: Two obtuse angles are formed by cutting, in a thickness direction, four corner parts of a core material 1 which is a square shape in plan view. After drying, two pieces of core material 1 fixed with a binding band 2 is inserted into a bag (container) 3 in a square shape in plan view which is heat-sealed at three edges from an open edge and then put this in a vacuum bath to vacuum. Then, the open edge is heat sealed to complete sealing and the vacuum heat insulating panel 4, for example, approximately 10 mm thick is formed. Thus, small two crests 5 may be generated as excessive parts of the bag 3 overlap at the four corner of the vacuum heat insulating panel 4 at the time of vacuuming and wrinkles are formed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vacuum heat insulation panel that is formed by storing a rectangular core material made of glass wool or the like in a bag having a high gas barrier property and vacuum-sealing it.

There has been proposed a vacuum heat insulating panel using glass wool that has no outgas, no dust, and excellent heat insulating performance (see Patent Document 1).
JP 2003-155651 A

  However, when filling the core material into the bag, evacuating and vacuum-sealing, as shown in FIG. 10, the excess portion of the bag is superposed at the corner of the vacuum heat insulation panel 20 having a rectangular shape in plan view. When a crest 21 is formed, and particularly a large crest 21 is formed, the crest 21 extends to the seal portion 22 of the bag.

  Therefore, in view of the above-described problems, the present invention prevents vacuum breakage by making small even if crests due to wrinkles at the corners of the vacuum insulation panel occur when vacuuming and vacuum-sealing. .

  Therefore, the first invention is a vacuum heat insulation panel in which a rectangular core material made of glass wool or the like in a plan view is housed in a bag having a high gas barrier property and vacuum-sealed, and the corner portions of the core material are thickened. It is characterized by being cut in the vertical direction.

  The second invention is a vacuum heat insulation panel comprising a rectangular core material made of glass wool or the like in a plan view and housed in a highly gas barrier bag and vacuum-sealed. Two obtuse angles are formed by cutting in the direction.

  Further, the third invention is a vacuum heat insulation panel comprising a rectangular core material made of glass wool or the like in a plan view and housed in a bag having a high gas barrier property, and is vacuum-sealed. Is formed to be a curved surface.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the peripheral portions of both surfaces of the core material are made thinner than portions other than the peripheral portions.

  According to the present invention, it is possible to prevent vacuum breakage as a small thing even if crests due to wrinkles at the corners of the vacuum insulation panel occur when vacuuming and sealing with vacuum, and foam polyurethane is used for the outer box. It is possible to prevent the outer box from being uneven when it is filled between the inner box and the inner box to form a heat insulating material.

  The best mode for carrying out the present invention will be described below with reference to the drawings. First, the manufacturing method of the core material of the vacuum heat insulation panel used as a heat insulating material will be described by taking a home refrigerator as an example among cooling storages such as a home refrigerator, a freezer, and a commercial showcase. First, since the core material that generates outgas breaks the degree of vacuum after being vacuumed and sealed, the heat insulation effect is diminished, and the core material of this embodiment does not generate outgas. First, glass beads are melted to produce glass wool having a short length (about 1 millimeter) and a short diameter (1 to 3 microns). The produced glass wool has a cotton-like shape and has various directions.

  Then, in order to break down this glass wool and lay it down as much as possible in the same direction, this glass wool, an inorganic binder such as silica and a solvent (water) are mixed (opened) at room temperature, and this mixed solution is passed through a conveyor. Extracting on a conveyor belt made of filter cloth while rotating at a predetermined speed.

Then, gradually removing water by water absorption by suction device (not shown) while moving below said filter cloth, the density and ^{100kg / m 3 ~160kg / m 3} . Furthermore, it is dried by a drying device (not shown) for the following reason in a process between this conveyor and a winding device (not shown). That is, in a state where the core material is not dried, a considerable amount of moisture still remains in the core material, and it takes a long time to dry the core material just before storing the core material in a bag and preparing a vacuum heat insulation panel. This is because the moisture to be outgases.

  The strip-shaped core material having a certain width (for example, 460 mm) produced in this way is cut into a certain length (for example, 1200 mm). And, as shown in FIG. 1, since the unevenness on the surface side is larger than that on the filter cloth surface side, the cut core material 1 having, for example, a rectangular shape in plan view, is cut into the filter cloth surface. In the state of being polymerized so that the side becomes the outside, the short side direction and / or the long side direction are fixed by the binding band 2 having a width of, for example, about 30 millimeters and outgassing. In this way, fixing with the tie band 2 in a state of being polymerized so that the filter cloth side with small irregularities is on the outside, a vacuum heat insulation panel is created later and attached to the inner surface of the outer box of the refrigerator This is because when the heat insulating material is foam-filled, if the unevenness is large, the outer box has unevenness and the appearance is deteriorated.

  The binding band 2 is made of a synthetic resin material such as PP (polypropylene) or PET (polyethylene terephthalate). As described above, two binding bands 2 are polymerized on the filter cloth side as described above. In the state of being wound around the core material 1, the vicinity of the end is bonded by heat sealing.

  As a result, the two core materials 1 are fixed in a state where they are aligned with each other, and the two core materials 1 are used to have a predetermined thickness. If the core material having the same thickness is to be manufactured, not only the time corresponding to the thickness but also the water absorption time by the suction device becomes longer to obtain the desired density, so the rotation of the conveyor is made slower. This is because the production efficiency deteriorates. Therefore, when manufacturing a thing with the same thickness, it is better to produce a plurality of thin ones for better production efficiency. If it is composed of a plurality of sheets, for example, three sheets, the core material positioned on both outer sides is fixed with the binding band 2 in a superposed state so that the filter cloth side with small irregularities is on the outer side.

  In addition, although the outgas from the adhesive is small, it may be bound with adhesive tape such as cellophane tape or gum tape to fix multiple core materials, and similarly bonded with adhesive or tape with double-sided adhesive. Furthermore, after inserting into a net-like bag made of a heat-shrinking synthetic resin material such as PP (polypropylene) or PET (polyethylene terephthalate), it may be fixed by shrinking by applying heat. .

  Next, the layered core material 1 is dried at a temperature of 100 to 120 ° C., for example, for about 60 minutes, so as to prevent outgas generation, and then vacuum-packed. That is, after drying, two core materials 1 fixed by the binding band 2 are placed from one side opened in a square bag (container) 3 in a plan view in which three sides are heat-sealed. Put in a vacuum (not shown), evacuate, set the degree of vacuum to 13.3 Pa to 1.33 Pa (0.1 to 0.01 Torr), and heat seal and seal the remaining one opened The vacuum heat insulation panel 4 having a thickness of, for example, about 10 millimeters is formed (see FIG. 4).

  Any material can be used as the bag 3 as long as it has a gas barrier property (high gas barrier property), can be heat-sealed, and can store the core material 1 and maintain the inside in a vacuum. However, for example, a bag using a gas barrier film having a four-layer structure of nylon, aluminum-deposited PET (polyethylene terephthalate), aluminum foil, and high-density polyethylene is preferably used.

  When forming this vacuum heat insulating panel 4, as shown in FIG. 2, both surfaces of the two core members 1, that is, the peripheral portions 6 of the front and back surfaces are pressed or cut within a range of about 10 millimeters from the end portions. Accordingly, it is made thinner than the portion other than the peripheral portion, and the corners of the four corners of the core material 1 having a square shape in plan view are placed on a horizontal plate (not shown) so that the largest area is the bottom surface. In the state, it is cut in the thickness direction to form two obtuse angles of about 120 degrees, for example (see FIG. 3).

  Accordingly, the peripheral edge portions 6 on both surfaces of the two core materials 1 are pressed or cut or slanted so as to have a step or thin toward the outer end portion, and further, the four corners of the core material 1 are further removed. By cutting away the corners in the thickness direction, excess wrinkles caused by superposition of excess portions of the bag 3 on the peripheral edge of the surface of the vacuum heat insulation panel 4 during evacuation do not occur. That is, when a part of the peripheral surface of the core material 1 is not pressed or excised, the space between the bag 3 and the two core materials 1 is first sucked when vacuuming, and this 2 Since the air in the core material 1 is sucked, the excess portion of the bag at the peripheral edge of the core material 1 is superposed and swells to generate wrinkles, or the core material is removed from the vacuum chamber (not shown). Atmospheric pressure is applied when it is taken out from the surface, the peripheral edge of the surface of the core material 1 is pushed in the direction of the core material 1, and the excess portion of the bag 3 is superposed and swells to generate wrinkles. This can be prevented.

  If raised wrinkles are generated, the vacuum insulation panel 4 is attached in contact with the inside of the outer box of the refrigerator, and foamed polyurethane is filled between the outer box and the inner box to form a heat insulating material. In addition, the wrinkles cause the outer box to be uneven, which makes the appearance worse, but according to the present embodiment, such a situation can be avoided.

  In addition, since the corners of the four corners of the core material 1 are cut in the thickness direction to form two obtuse angles, an excess portion of the bag 3 is added to the obtuse angle portions at the four corners of the vacuum heat insulating panel 4 during the vacuuming described above. May cause wrinkles to form two small peaks 5. However, if the corners of the four corners are cut in the thickness direction and left at right angles that do not form two obtuse angles as in the prior art, one large peak due to wrinkles is formed at the four corners, and this peak extends to the bag 3. For this reason, the strength of the corners of the bag is weak, and sometimes it breaks to cause a vacuum break, or this vacuum insulation panel is installed inside the outer box of the refrigerator, and between this outer box and the inner box When the heat insulating material is formed by filling the polyurethane foam with the foam, there is a case where the appearance is deteriorated due to the unevenness of the outer box due to the large mountain, but these problems can be solved.

In this way, since it is necessary to produce a material having a high heat insulation effect, the vacuum heat insulation panel 4 having a density of about 180 to 400 kg / m ³ can be produced by evacuation. Glass wool is required and the cost is high, and therefore, about 200 kg / m ³ is desirable in consideration of cost and the like.

  Before fixing the two core materials 1 with the binding band 2, at least one peripheral portion of each core material 1 is pressed or excised, or the corners of the four corners of each core material 1 are excised 2. Two obtuse angles may be formed, but when forming the obtuse angle in the former or forming the obtuse angle in the latter, it is performed once with the two core members 1 fixed by the binding band 2. Since the processing (pressing or excision) is sufficient, the production efficiency is good, and therefore it is desirable after fixing.

  Next, although the vacuum heat insulation panel 4 produced in this way is used for the refrigerator 10, it demonstrates based on FIG. 6 thru | or FIG. First, the refrigerator 10 includes a refrigerator main body 14 including an outer box 11 made of a steel plate, an inner box 12 formed of a synthetic resin material, and a heat insulating material 13 filled between both boxes 11 and 12, and the inner box. The heat insulating door 19 is configured to close the front opening of the 12 so as to be freely opened and closed.

  And the vacuum heat insulation panel 4 is attached to the inner surface of the outer box 11, and the foamed polyurethane 15 is filled between the boxes 11 and 12 to form the heat insulating material 13. The heat insulating material 13 has low thermal conductivity (heat insulation). By using the vacuum heat insulating panel 4 (which has high performance), heat leakage can be kept low, and the thickness of the heat insulating material 13 in the refrigerator 10 can be reduced.

  First, as shown in FIG. 7, a double-sided adhesive tape 17 having a thickness of 0.5 to 1.5 mm is attached to one surface of the vacuum heat insulating panel 4 having a predetermined size, The vacuum heat insulating panel 4 is attached and fixed to the inner surface of the outer box 11 having a thickness of 0.4 to 0.6 mm with the tape 17 with adhesive. As described above, when the double-sided adhesive tape 17 has a thickness of 0.5 to 1.5 millimeters, the elasticity of the tape 1 (vacuum insulation panel 4) can be sufficiently absorbed. If it exceeds millimeters, the elasticity is lost and the outer box 11 is partially pressed by rigidity to generate irregularities. If it is less than 0.5 mm, the irregularities of the vacuum heat insulating panel 4 cannot be absorbed elastically. Under the influence of the above, irregularities are formed in the outer box 11 after foam filling of the heat insulating material, and the appearance is deteriorated.

  The double-sided adhesive tape 17 has elasticity, for example, one made of foamed polyethylene or flexible polyurethane foam, and has an adhesive layer on both sides, and the elasticity of the vacuum heat insulating panel 4 can be absorbed by the elasticity. Anything is acceptable.

  Therefore, instead of the double-sided adhesive tape 17, an elastic foaming hot melt may be applied to the inner surface of the outer box 11, and the vacuum heat insulating panel 4 may be attached and fixed. Thereby, the unevenness | corrugation of the vacuum heat insulation panel 4 can be absorbed with the elastic force similarly to the tape 17 with a double-sided adhesive agent.

  In this case, in the created vacuum heat insulation panel 4, the overlapping seal portion 3 </ b> A on the three sides excluding the opening in the bag 3 before storing the core material 1 is 12 mm, and the bag 3 is originally made large. When the core material 1 is inserted into the bag 3 and evacuated, the surplus portion is also polymerized and the ear portion becomes longer than 12 millimeters. In addition, when evacuated, the core material 1 is offset and produced on either side of the opening and the opposite sides other than the side facing the opening.

  And since the ear part 3B (after sealing) that formed the opening before vacuuming is 70 to 80 mm, the ear part 3B is folded back to the vacuum heat insulation panel body side and fixed with an adhesive tape or the like. In addition, as described above, the ear portion 3C which is long and deviated on the other opposite side is similarly folded back and fixed with an adhesive tape or the like, and the front opening of the refrigerator main body 14 is opened as shown in FIG. In the state of being faced down, both sides of the side wall 3C (folded back) are shifted downward in both side walls, and the ear portion 3C, which is the folded-back portion, is positioned in the vicinity of the position where foaming starts. The vacuum heat insulation panel 4 is attached to the outer box 11 with a tape 17 with an adhesive, and the heat insulating material 13 is formed by in-situ foaming.

  That is, when the foaming liquid is injected, it starts to foam from below, so if the ear portion 3C at the bottom of the vacuum heat insulation panel 4 is not folded back and fixed to the vacuum heat insulation panel body, either the outer box side or the inner box side In this case, it is not known whether the ear portion 3C is bent, and if the heat insulating material 13 is formed in a state of being in contact with the inner box 12 if it is bent to the inner box side by the foaming pressure, a heat bridge phenomenon occurs. As described above, the bent ear portion 3C (folded back) is placed downward so that the folded ear portion 3C is in the vicinity of the position where foaming starts, and the folded portion is positioned inside. As described above, the tape is attached to the outer box 11 with the double-sided adhesive tape 17. The reason why the folded portion is on the inner side is that when folded back to the outside, that is, the outer box 11 side, the ear portion 3C presses the outer box 11 to form irregularities on the outer box 11 and the appearance is deteriorated. .

  In addition, the ear | edge part 3D shortened with the double-sided adhesive so that it may be located on the upper side and a folding | returning part may be located inside does not fold. If folded, the number of processes will increase accordingly, and even if it is not folded, it is close to the end of foaming, so the foaming pressure is weak and does not press strongly, and it does not bend toward the inner box side due to foaming pressure This is because it is considered that the heat bridge phenomenon does not occur.

  Therefore, the vacuum heat insulation panel 4 is attached to the outer box 11 with the double-sided adhesive tape 17 with the ear part 3C (folded back) that is longer than the side facing down. When the heat insulating material 13 is formed by injecting the foaming liquid through the injection port 18, the bag 3 is not partly in contact with the inner box 12, so that the heat bridge phenomenon does not occur and the refrigerator is used. Sometimes, heat of the outside air is prevented from being conducted to the inner box 12 through the ear portion, and the heat insulation effect is not diminished.

  In addition, in this embodiment, although the vacuum heat insulation panel was used for the refrigerator main body, you may use not only this but for the heat insulation door 19 which obstruct | occludes the front opening of the said inner box 12 so that opening and closing is possible. In the present embodiment, the vacuum heat insulating panel is fixed by fixing the two core materials 1 having a rectangular shape in plan view with the binding band 2 that does not emit outgas in a state where the core material 1 is superposed so that the filter cloth side is on the outside. Although it produced, it is not restricted to this, You may produce a vacuum heat insulation panel with one core material which has predetermined | prescribed thickness. Furthermore, in the present embodiment, the four corners of the core material 1 are cut in the thickness direction so as to form two obtuse angles of about 120 degrees, for example. As shown, a curved surface may be formed by cutting so that the outer surface of the corner portion of the core material has an arc shape.

  Although the embodiments of the present invention have been described above, various alternatives, modifications, and variations can be made by those skilled in the art based on the above description, and the present invention is not limited to the various alternatives described above without departing from the spirit of the present invention. It includes modifications or variations.

The perspective view of the state which fixed the core material with the binding band is shown. The perspective view of the core material of the state which pressed or cut off the peripheral part of both surfaces so that it may have a level | step difference is shown. The partial perspective view of the core material of the state which cut | disconnected the corner | angular part in the thickness direction in the state fixed with the cable tie is shown. It is a figure which shows the process of accommodating a core material in a bag and producing a vacuum heat insulation panel. The principal part perspective view of a vacuum heat insulation panel is shown. The partial longitudinal cross-sectional view of a refrigerator is shown. It is a figure which shows the state before attaching a vacuum heat insulation panel to the inner surface of an outer case. The longitudinal front view before the on-site foaming of the state which made the refrigerator main body the front opening part downward is shown. The partial perspective view of the core material which shows other embodiment is shown. It is a one part perspective view of the conventional vacuum heat insulation panel.

Explanation of symbols

1 Core material 2 Cable tie 3 Bag 4 Vacuum insulation panel 5 Mountain 6 Edge

Claims (4)

  A vacuum insulation panel comprising a rectangular core material made of glass wool or the like in a plan view and housed in a highly gas-blocking bag and vacuum-sealed, wherein corners of the core material are cut in the thickness direction. Vacuum insulation panel.   A vacuum heat insulation panel comprising a rectangular core material made of glass wool or the like in a plan view and housed in a bag having a high gas barrier property and vacuum-sealed. A vacuum insulation panel characterized by forming an obtuse angle.   A vacuum heat insulation panel formed by storing a rectangular core material made of glass wool or the like in a plan view in a bag with high gas barrier properties and vacuum-sealing, and formed such that the outer surface of the corner of the core material is curved. Vacuum insulation panel characterized by that.   The vacuum heat insulation panel according to any one of claims 1 to 3, wherein peripheral portions of both surfaces of the core material are thinner than portions other than the peripheral portions.

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