JP2005112422A - Thermally insulated container, and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the heat insulation of a thermally insulated container by forming the cell shape and the cell direction of a foamed body laminated on a wall surface of a container body to be a specified shape and a specified direction. <P>SOLUTION: In the thermally insulated container 10 with a foamed body 21 overlying a wall surface 14 of a container body 11 having a content storage space 12 on the inner side, the cell 22 of the foamed body 21 has a major diameter d1 in the parallel direction and the minor diameter d2 in the vertical direction with respect to the wall surface 14 of the container body 11. A longitudinal rib 15a along the major diameter direction of the cell 22 and a lattice-shaped rib 15 consisting of the longitudinal rib 15a and a transverse rib 15b substantially orthogonal thereto are provided on the wall surface 14 of the container body, and the height of the longitudinal rib 15a is set to be larger than the height of the transverse rib 15b. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat insulating container and a method for manufacturing the same.

  Conventionally, as a heat insulating container, a heat insulating layer made of a foam is laminated on the wall surface of the container and the heat insulating property is enhanced by the heat insulating layer. Also, a heat insulating container filled with a foam that holds at least one low thermal conductivity gas selected from the group consisting of xenon, krypton, and argon in the space between the inner container and the outer container of the synthetic resin double container. Proposed.

However, in the conventional heat insulation container in which the foam is provided between the wall surface of the container or between the inner container and the outer container of the double container, it is difficult to say that the heat insulation is sufficient, and further improvement of the heat insulation is required. ing.
Japanese Patent Laid-Open No. 11-245975

  As a result of intensive studies in order to improve the heat insulating property of the heat insulating container, the present inventor has found the following. That is, it has been found that the heat insulating property of the heat insulating container can be improved by setting the foam cell (also referred to as a bubble) laminated as a heat insulating material on the wall surface of the container main body to a specific shape and orientation. Invented. And, as described above, the present invention provides a heat insulating container with improved heat insulation properties by making the cell shape of the foam laminated on the wall surface of the container main body and the direction of the cell a specific shape and direction, and its rational A simple manufacturing method is provided.

  The present invention related to a heat-insulating container is a heat-insulating container in which a foam is laminated on the wall surface of a container body having a content storage space on the inside. The vertical direction is a minor axis. The wall surface of the container body preferably has a rib. Moreover, an outer peripheral wall body may be provided on the outer periphery of the foam, and a rib may be provided on the wall surface of the outer peripheral wall body. It is preferable that the ribs have a lattice shape of vertical ribs along the major axis direction of the cells and horizontal ribs substantially orthogonal to the vertical ribs, and the height of the vertical ribs is higher than the height of the horizontal ribs.

  The present invention relating to a method for manufacturing a heat-insulating container sets a container body having a content storage space on the inside thereof, and injects a foaming raw material into a foam molding space between the wall surface of the container body and the inner surface of the mold Then, the foaming raw material is foamed and filled in the foam molding space so as to surround the wall surface of the container body from the injection position of the foaming raw material, and the foaming raw material filled in the foam molding space is cured. Thus, in the method of manufacturing the heat insulating container in which the foam is laminated on the wall surface of the container body, the foam is placed at the position where the foam raw material fills the foam forming space and finally joins the mold. A vent hole is formed in advance through the body molding space and the outside of the mold.

  In the present invention relating to the method for manufacturing a heat insulating container, the mold is used as an outer peripheral wall of the heat insulating container, and is injected into a foam forming space between a wall surface of the container main body and a wall surface of the outer peripheral wall body, and foamed. By curing the foam raw material filled in this manner, the container main body, the foam laminated on the wall surface of the container main body, and the outer peripheral wall covering the outer peripheral surface of the foam may be integrated. Good. Moreover, in this invention regarding the manufacturing method of the said heat insulation container, you may provide a rib in the wall surface by the side of the foam formation of the said container main body, the wall surface by the side of the foam formation of the said outer peripheral wall body, or both. Furthermore, when the rib is provided, a grid of vertical ribs along the foaming direction of the foaming raw material from the injection position of the foaming raw material toward the vent hole, and a horizontal rib substantially orthogonal to the vertical rib, It is preferable that the height of the vertical rib is higher than the height of the horizontal rib.

  The foam cell is composed of bubbles generated during foaming of the foaming raw material, and the inside of the cell is hollow, and is mainly filled with carbon dioxide gas. In general, the thermal conductivity of gas is low (heat is not easily transmitted) and is 1/4 to 1/10 of the thermal conductivity of the resin that constitutes the cell. Depending on whether or not there is a hollow portion of the cell filled with etc., the heat conduction conditions differ. The foam cell according to the present invention has a flat shape having a major axis in a direction parallel to the wall surface of the container body and a minor axis in the direction perpendicular to the container body. When transmitted, the rate of conduction through the skeleton of the foam is high, and when heat is transmitted vertically to the wall surface of the container body, the heat is transmitted through the hollow part of the cell or around the cell, Therefore, it becomes difficult to transmit heat. Therefore, according to the heat insulating container of the present invention, it is difficult for heat to be transmitted in the vertical direction to the wall surface of the container main body, so that it is possible to improve the heat retention. In the heat insulating container of the present invention in which the cell uses a flat foam, a heat retention improvement of about 20% at the maximum was obtained as compared with a heat insulating container using a spherical or non-flat cell-shaped conventional foam. .

  Further, in the heat insulating container of the present invention, it is possible to protect the foam by providing the outer peripheral wall body, and by providing a rib on the wall surface of the outer peripheral wall body or the container main body, the strength of the heat insulating container can be increased. In addition, it is possible to make it difficult for the container main body or the outer peripheral wall body to be deformed by the foaming pressure of the foam raw material when the foam is foamed from the foam raw material on the wall surface of the container main body. Further, the ribs are formed in a lattice pattern of vertical ribs along the major axis direction of the foam cells and horizontal ribs substantially orthogonal to the vertical ribs, and the height of the vertical ribs is higher than the height of the horizontal ribs. For example, the reinforcing effect by the ribs is increased, and when the foaming material is foamed on the wall surface of the container body, it becomes easy to flow in the direction of the longitudinal ribs. This makes it easier to form cells.

  According to the method for manufacturing a heat insulating container of the present invention, the foaming raw material injected into the foam molding space between the wall surface of the container main body set in the mold and the inner surface of the mold is from the injection position of the foaming raw material to the container main body. Since the vent hole is formed in advance at a position where the foam molding space is filled and finally merged so as to surround the wall surface of the foam, the foaming raw material is directed to the vent hole along the wall surface of the container body. The foam formed on the wall surface of the container body has a cell having a major axis in the parallel direction and a minor axis in the vertical direction with respect to the wall surface of the container body. Can provide a good insulated container.

  Furthermore, in the method for manufacturing a heat insulating container according to the present invention, if the mold is an outer peripheral wall of the heat insulating container, the heat insulating container having a good heat insulating property has a structure in which the foam on the wall surface of the container main body is surrounded by the outer peripheral wall. Can be easily obtained. Further, if ribs are provided on the container main body or the outer peripheral wall body, the container main body or outer peripheral wall body can hardly be deformed by the foaming pressure of the foaming raw material. Furthermore, the ribs are in the form of a lattice of vertical ribs along the foaming direction of the foaming raw material from the foaming raw material injection position toward the vent hole, and horizontal ribs substantially orthogonal to the vertical ribs, and the height of the vertical ribs If the height is made higher than the height of the lateral ribs, the reinforcing effect by the ribs increases, and when the foaming material foams on the wall surface of the container body, it becomes easy to flow along the vertical ribs to the vent holes, It becomes possible to more reliably form a foam having cells whose major axis is parallel to the wall surface of the container main body and whose minor axis is the vertical direction, and the heat insulation of the heat insulating container obtained thereby can be further improved. .

  1 is a front view of a heat insulating container according to a first embodiment of the present invention, AA cross-sectional view, BB cross-sectional view and schematic enlarged cross-sectional view of a required portion, FIG. 2 is a front view of the container main body in the same embodiment , AA cross-sectional view, BB cross-sectional view, top view, bottom view, FIG. 3 is a cross-sectional view showing an example of the manufacturing process of the heat insulation container in the present invention, FIG. 4 is a heat insulation according to the second embodiment of the present invention. Front view of container, AA sectional view, BB sectional view and schematic enlarged sectional view of required part, FIG. 5 is a front view of a heat insulating container according to the third embodiment of the present invention, AA sectional view, B It is -B sectional drawing and the schematic expanded sectional view of a required part.

A heat insulating container 10 shown in FIG. 1 includes a container main body 11 and a foam 21 laminated on the outer wall surface 14 thereof.
The container body 11 is made of a metal, a synthetic resin, or the like, and as shown in FIG. 2, is made of a hollow body having a content accommodating space 12 inside. The container main body 11 of the present embodiment is formed of a cylindrical hollow body in which an open cylindrical portion 13 that communicates with the content storage space 12 is formed at the center of one end surface 11a.

  Ribs 15 are formed on the outer wall surface 14 of the container body 11. The rib 15 includes a vertical rib 15a and a horizontal rib 15b. The vertical ribs 15a are radially formed around the opening cylinder portion 13 on the one end surface 11a of the container body 11, and are formed radially from the center on the other end surface 11b of the container body 11. The side surface 11c is formed in parallel with the axial direction K (perpendicular to the radial direction) K of the container body 11, and the longitudinal ribs 15a are continuous between the both end surfaces 11a and 11b. On the other hand, the horizontal ribs 15b are formed so as to be substantially orthogonal to the vertical ribs 15a. The vertical rib 15a is higher in height from the wall surface 14 of the container body 11 than the horizontal rib 15a. The material, shape, size, and thickness of the container body 11 and the dimensions and number of the ribs 15 are set as appropriate. For example, the material of the container body 11 is polyamide, outer diameter 200 mm, height 200 mm, thickness 3 mm, The case where the height of the vertical rib 15a is 5 mm, the thickness is 3 mm, and the number is eight, and the height of the horizontal rib 15b is 3 mm, the thickness is 3 mm, and the number is three is given. The wall surface 14 on which the ribs 15 are formed corresponds to the wall surface on the foam forming side.

  The foam 21 is made of various materials and is preferably a foam mainly composed of closed cells, and among them, a rigid polyurethane foam is preferable. The foam 21 is laminated so as to surround the outer wall surface 14 of the container body 11. The cell 22 of the foam 21 has a major axis d1 in the parallel direction L to the wall surface 14 and a minor axis d2 in the direction M perpendicular to the wall surface 14.

  Next, the Example of the manufacturing method of the said heat insulation container 10 is described using FIG. First, as shown in FIG. 3A, the container body 11 is set in a mold 31. In the mold 31 of this embodiment, a hole 32 through which the opening cylindrical portion 13 of the container main body 11 can be inserted is formed on the lower surface, and the container main body 11 is placed in the mold so that the opening cylindrical portion 13 faces downward. set. By setting the container body 11 in the mold 31, a foam molding space 34 surrounding the wall surface 14 of the container body 11 is formed between the inner surface 33 of the mold 31 and the wall surface 14 of the container body 11. It is formed. The mold 31 has a structure that can be divided into left and right or up and down, and a vent hole 35 that connects the foam molding space 34 and the outside of the mold 31 is formed at the center of the upper surface. The vent hole 35 is positioned so that the foam raw material P injected into the mold 31 surrounds the wall surface 14 of the container body 11 as shown in FIG. 34 is set to the position where it finally fills and merges. The diameter of the vent hole 35 may be any dimension that allows air to pass through the vent hole 35, and is usually about 5 to 30 mm.

  Subsequently, a foam raw material P such as a rigid polyurethane foam raw material is injected into a predetermined position of the foam molding space 34. In the present embodiment, one point is injected near the opening cylinder portion 13 of the container main body 11 on the lower surface of the mold 31 opposite to the vent hole 35. The foaming raw material P injected into the mold 31 starts foaming and fills the foam molding space 34 as shown in FIGS. 3B, 3C, and 3D. At that time, since the foam molding space 34 and the outside of the mold 31 communicate with each other at the vent hole 35, the pressure in the foam molding space 34 is lowest at the position of the vent hole 35. . Therefore, the foaming raw material P flows in the foam molding space 34 so as to surround the wall surface 14 of the container body 11 from the injection position toward the vent hole 35. Further, when the foam molding space 34 is filled with the foam raw material P, the vertical ribs 15a are present on the wall surface 14 of the container body 11, and therefore the foam raw material P extends along the direction of the vertical ribs 15a. It is guided and becomes easy to flow toward the vent hole 35. And since the said vertical rib 15a is higher than the said horizontal rib 15b, although the said horizontal rib 15b exists, the induction | guidance | derivation effect | action of the foaming raw material by the said vertical rib 15a is obtained reliably. When the foam material P is foamed, the air in the foam molding space 34 is discharged from the vent hole 35 to the outside of the mold.

  The foam raw material P filled in the foam molding space 34 is subsequently cured, so that the foam 21 is formed on the wall surface 14 of the container body 11 in a laminated state. As shown in (C), (D), and (E) of FIG. 1, the foam 21 has an internal cell 22 along the foaming direction (flow direction) of the foaming raw material P, that is, the container body. 10 in the direction perpendicular to the foaming direction (flow direction) of the foaming raw material P, that is, in the direction perpendicular to the wall surface 14 of the container body 11. A short axis d2 along the axis. In particular, when the foaming raw material P is made to flow easily toward the vent hole 35 by the vertical ribs 15a, the major axis d1 of the cell along the flow direction of the foaming raw material P becomes longer, and the foaming is performed with it. The minor axis d2 of the cell orthogonal to the flow direction of the raw material P is further reduced, and a more preferable cell structure is obtained. If the molded product is taken out from the mold 31 after the foaming raw material P is cured, the heat insulating container 10 of FIG. 1 is obtained.

  FIG. 4 shows a heat insulating container 10A according to the second embodiment of the present invention. The heat insulating container 10A of the second embodiment is the heat insulating container of the first embodiment in that an outer peripheral wall body 25 substantially similar to the container main body 11 is provided on the outer periphery of the foam 21 in the first embodiment. 10 is the same as that of the heat insulation container 10 of the first embodiment. The outer peripheral wall 25 is made of an appropriate material such as synthetic resin or metal. The same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.

  The heat insulation container 10A of the second embodiment is manufactured by forming the mold 31 shown in FIG. 3 with the outer peripheral wall body 25, and between the inner wall surface 25a of the outer peripheral wall body 25 and the wall surface 14 of the container main body 11. What is necessary is just to inject a foaming raw material into the foam formation space formed in this. In that case, a vent hole 26 similar to the vent hole 35 of the first embodiment is formed in the outer peripheral wall body 25 in advance at the joining position of the foaming raw material. Then, the outer peripheral wall body 25 is arranged so that the vent hole 26 faces upward, and the foam raw material is injected into a lower position in the foam molding space opposite to the vent hole 26 to be foamed. . The material, shape, size, and thickness of the outer peripheral wall body 25 and the dimensions and number of the ribs 15 are set as appropriate, but as an example, when the container body 11 is the material and dimensions of the first embodiment, The case where the outer peripheral wall body 25 is made of a material ABS, an outer diameter of 250 mm, a height of 250 mm, and a thickness of 3 mm will be described. Further, the outer peripheral wall body 25 is preferably a combination of a plurality of divided bodies divided into left and right or top and bottom. In the outer peripheral wall body 25, a hole 25 b into which the opening cylinder portion 13 can be inserted is formed at a position corresponding to the opening cylinder portion 13 of the container body 11.

  FIG. 5 shows a heat insulating container 10B according to the third embodiment of the present invention. The heat insulation container 10B of the third embodiment is different from the heat insulation container 10B of the second embodiment in that a lattice-shaped rib 29 composed of vertical ribs 29a and horizontal ribs 29b is provided on the wall surface of the outer peripheral wall body 27. Other configurations are the same as those of the heat insulating container 10A of the second embodiment. The vertical ribs 29a are formed radially around the hole 27d through which the open cylindrical portion 13 of the container body 11 can be inserted on the inner wall surface 27a of one end of the outer peripheral wall body 27, and the other end of the outer peripheral wall body 27. The inner wall surface 27b is radially formed around the vent hole 28, and the side inner wall surface 27c of the outer peripheral wall body 27 is formed in parallel with the axial direction (perpendicular to the radial direction) of the outer peripheral wall body 27. The vertical rib 29a is continuous between the inner wall surfaces 27a and 27b at both ends. On the other hand, the horizontal rib 29b is formed to be orthogonal to the vertical rib 29a. The vertical rib 29a is higher in height from the inner wall surface of the outer peripheral wall body 27 than the horizontal rib 29b. The inner wall surfaces 27a, 27b, 27c in which the ribs 29 are formed in the outer peripheral wall body 27 and the wall surface 14 in which the ribs 15 of the container body 11 are formed correspond to the surfaces on the foam forming side. The material, shape, size, thickness, and dimensions and number of the ribs 29 of the outer peripheral wall 27 are appropriate, but as an example, when the container body 11 is the material and dimensions of the first embodiment, The outer peripheral wall 27 is made of ABS, outer diameter is 250 mm, height is 250 mm, thickness is 3 mm, the vertical rib 29 a is 5 mm, thickness is 3 mm, number is 8, and the lateral rib 29 b is 3 mm, thickness is 3 mm, number is 3. Take the case of a book. The outer peripheral wall body 27 is preferably a combination of a plurality of divided bodies divided into left and right or top and bottom.

  The heat insulation container 10B of the third embodiment is manufactured by forming the mold 31 shown in FIG. 3 with the outer peripheral wall body 27 and between the wall surface of the outer peripheral wall body 27 and the wall surface 14 of the container main body 11. What is necessary is just to inject a foaming raw material into the foam molding space formed. In that case, the foaming raw material is injected into a lower position in the foam molding space opposite to the vent hole 28 so that the outer peripheral wall body 27 faces the vent hole 28 upward, and is foamed. .

  In the third embodiment, ribs are provided on both the container body 11 and the outer peripheral wall 27. However, ribs may be provided only on the outer peripheral wall 27.

It is the front view of the heat insulation container which concerns on 1st Example of this invention, AA sectional drawing, BB sectional drawing, and the schematic expanded sectional view of a required part. It is the front view of the container main body in the Example, AA sectional drawing, BB sectional drawing, a top view, and a bottom view. It is sectional drawing which shows an example of the manufacturing process of the heat insulation container in this invention. It is the front view of the heat insulation container which concerns on the 2nd Example of this invention, AA sectional drawing, BB sectional drawing, and the general | schematic expanded sectional view of a required part. It is the front view of the heat insulation container which concerns on the 3rd Example of this invention, AA sectional drawing, BB sectional drawing, and the schematic expanded sectional view of a required part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Thermal insulation container of 1st Example 10A Thermal insulation container of 2nd Example 10B Thermal insulation container of 3rd Example 11 Container main body 12 Contents storage space 14 Wall surface of container main body 15, 29 Rib 15a, 29a Vertical rib 15b, 29b Horizontal Rib 25, 27 Outer wall 26, 28 Outer wall vent hole 31 mold 34 Foam molding space 35 mold vent hole

Claims (10)

In the heat insulating container in which the foam is laminated on the wall surface of the container main body having the content storage space inside,
The insulated container, wherein the foam cell has a major axis in the parallel direction and a minor axis in the vertical direction with respect to the wall surface of the container body.   The heat insulation container according to claim 1, wherein a rib is provided on a wall surface of the container main body.   The heat insulation container according to claim 1, wherein the heat insulation container includes an outer peripheral wall body on an outer periphery of the foam.   The heat insulating container according to claim 3, wherein a rib is provided on a wall surface of the outer peripheral wall body.   The rib has a lattice shape of a longitudinal rib along the major axis direction of the cell and a transverse rib substantially orthogonal to the longitudinal rib, and the height of the longitudinal rib is higher than the height of the transverse rib. The heat insulation container as described in any one of Claim 2 to 4. Set the container body with the contents storage space inside the mold,
Injecting a foaming raw material into a foam molding space between the wall surface of the container body and the inner surface of the mold,
Filling the foam molding space so as to surround the wall surface of the container body from the foaming raw material injection position by foaming the foaming raw material,
In the method of manufacturing a heat insulating container in which a foam is laminated on the wall surface of the container body by curing the foam raw material filled in the foam molding space,
In the mold, a vent hole is formed in advance at a position where the foam raw material fills the foam molding space and finally merges, and passes through the foam molding space and the outside of the mold. A method for manufacturing an insulated container. The mold is an outer peripheral wall of the heat insulating container,
By injecting the foaming raw material into a foam molding space between the wall surface of the container body and the wall surface of the outer peripheral wall body, foaming and filling, and then curing, the container body and the wall surface of the container body The method of manufacturing a heat insulating container according to claim 6, wherein the foam laminated on the outer periphery and the outer peripheral wall covering the outer peripheral surface of the foam are integrated.   The said container main body equips the wall surface by the side of foam formation with a rib, The manufacturing method of the heat insulation container of Claim 6 or 7 characterized by the above-mentioned.   The method for manufacturing a heat-insulating container according to claim 7 or 8, wherein the outer peripheral wall body includes a rib on a wall surface on a foam forming side. The rib comprises a grid of vertical ribs along the foaming direction of the foaming raw material from the injection position of the foaming raw material toward the vent hole, and horizontal ribs substantially orthogonal to the vertical ribs, and the height of the vertical ribs is The method for manufacturing a heat-insulating container according to claim 8 or 9, wherein the height of the lateral rib is higher.

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