JP2003034369A - Heat insulating container and manufacturing method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance a heat insulating property by providing a cylindrical label with a foaming layer and reduce the weight and cost of a container by thinning down a container body. SOLUTION: A heat insulating container comprises a cylindrical container body, which is made of a thermoplastic resin and has a bottom, and a cylindrical label attached to the container body. The cylindrical label consists of a thermally shrinkable sheet having a foaming layer and is made to shrink with heat so that the label fits to the shape of the container body before the label is attached to the container body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-insulating container equipped with a tubular label and a method for producing the same, for example, dry food such as instant noodles poured by pouring hot water or food heated by a microwave oven. The present invention relates to a heat-insulating container suitable for storing and storing high-temperature items such as soup and coffee, or low-temperature items such as frozen and refrigerated items, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, containers for instant foods such as instant noodles (dry side), foods heated in a microwave oven, hot coffee, and very cold beverages have been taken into consideration in consideration of risk of burns and ease of holding. The container itself has been devised for heat insulation. As such a heat insulating container, there is a foamed resin or a foamed polystyrene sheet formed into a sheet, but there is a problem such as strength. Further, recently, a container formed by injection molding using polypropylene as a material is also being used.
On the outer peripheral surface of the body of the container body formed by injection molding,
There is a case where a tubular label made of a heat-shrinkable film is packaged and heat-shrinked. In the heat-insulating container with the label, the container body is grasped through the tubular label, but the heat-shrinkable sheet having the foam layer is used for the tubular label to further improve the heat insulating property of the container. It is desired to let

[0003]

However, in this heat-insulating container with a label, the container body is covered with a non-shrinkable tubular label, and the tubular label is heat-shrinked by heating to be tightly fixed to the container body. The container body is required to have strength and heat resistance capable of withstanding the contracting force when the tubular label is thermally contracted, and as a result, the container body is obliged to be thick and the container itself becomes heavy. was there. On the other hand, this type of heat-insulating container with a label is required to be lightweight and low cost. To this end, the thickness of the container main body is made thin, the amount of resin material used is suppressed, and the weight of the container is reduced. Will be required.

Therefore, the present invention has been made in view of the above-mentioned problems of the prior art, and it is intended to provide a tubular label with a foam layer to enhance the heat insulating property and to reduce the weight and cost of the container by thinning the container body. Is an issue.

[0005]

The present invention has been made to solve the above problems, and a heat insulating container according to the present invention comprises a bottomed cylindrical container body made of a thermoplastic resin, and the container body. A heat-insulating container having a tubular label attached to a tubular label, the tubular label being made of a heat-shrinkable sheet having a foam layer and being heat-shrinkable according to the shape of the container body before being attached to the container body. It is characterized by being still,
The term “having a foam layer” includes not only a multilayer structure in which a foam layer and a non-foam layer are laminated but also a single layer or a multilayer structure in which the entire sheet is a foam layer.

In particular, the body of the container body has a label fixing portion for abutting the inner surface of the cylindrical label to fix the cylindrical label to the container body, and a vertical ridge covered with the label. And concave and convex portions are formed alternately in the circumferential direction,
It is preferable that a gap be formed between the ridge of the uneven portion and the inner surface of the tubular label.

The method for producing a heat-insulating container according to the present invention is a method for producing a heat-insulating container having a bottomed tubular container body made of a thermoplastic resin and a tubular label attached to the body of the container body. A heat-shrinkable tubular label having a foam layer is heat-shrinked in accordance with the shape of the container body to form a tubular label having a predetermined shape, and the heat-shrinkable tubular label is then attached to the container body. It is characterized by being attached to.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, referring to FIGS. 1 to 4 for an embodiment of a heat insulating container of the present invention, a bottomed cylindrical container main body 1 and a body portion 2 of the container main body 1 will be described. The label-equipped heat-insulating container having the tubular label 3 attached to the label will be described. The opening of the container body 1 is closed by a fitting lid formed by sheet molding from a sheet material,
Alternatively, it is releasably sealed by a seal lid made of a laminate material obtained by laminating a sealant layer on an aluminum foil, a synthetic resin film, paper or the like. The container main body 1 has a body portion 2 that expands upward in a substantially tapered shape, a substantially flat bottom portion 4 formed integrally with the body portion 2, and an outer side from an upper end portion of the body portion 2 to the outside. Flange portion 5 extending substantially horizontally toward the entire circumference
It has and. The bottom portion 4 is provided at a position above the lower end portion of the body portion 2 by a predetermined length and has a so-called raised bottom shape. Therefore, when the container is placed, the placement surface and the bottom portion 4 are placed. A space V is formed between and.

The body portion 2 is composed of a first body portion 6 which occupies most of the body portion 2 and is held by a hand, and a second body portion 7 adjacent to the upper side of the first body portion 6. The second body 7 has a larger diameter than the first body 6. That is, the second body portion 7 is formed so as to bulge outward than the first body portion 6, and the second body portion 7 is formed.
The outer peripheral surface 7a functions as a label fixing portion for fixing the cylindrical label 3 by contacting the inner surface of the cylindrical label 3.
In this embodiment, the tubular label 3 is fixed to the outer peripheral surface 7a of the second body portion 7 by adhesion.

The first body 6 has ribs 8 in the vertical direction formed at regular intervals in the circumferential direction and radially formed as a whole, and the ribs 8 extend over the entire length of the first body 6. Are continuously formed, and the projecting height gradually increases upward. The ribs 8 are all formed in substantially the same shape, and a step is provided between the outer peripheral surface 7a of the second body portion 7 and the tip of the rib 8, and the step is, for example, 0.5 to It is about 1 mm. Therefore, a gap G is continuously formed over the entire length between the tip of the rib 8 and the inner surface of the tubular label 3. The gap G is gradually reduced downward. In the present embodiment, the rib 8 is a ridge, the smooth region 9 between two adjacent ribs 8 is a ridge, and the first body portion 6 is an uneven portion.

The container body 1 constructed as described above is formed by injection molding from a thermoplastic resin.
Here, as the thermoplastic resin, for example, polypropylene, high-density polyethylene, polyethylene terephthalate, polycarbonate, polyamide, polystyrene, etc., but polypropylene (including propylene ethylene copolymer) is particularly light and has high mechanical strength. In addition, it is preferable because it is relatively inexpensive, has good moldability, has a high heat resistance temperature and a high heat distortion temperature, and has excellent heat resistance. In addition, a test method for the deflection temperature under load of hard plastic (JIS K720
The deflection temperature under load according to 7) is preferably 110 to 140 ° C., and particularly the deflection temperature under load is 120 to 130.
Those at ℃ are preferred. In addition, the body 2 is thin,
The thickness of the body portion 2 (smooth region 9 and second body portion 7) is preferably 0.3 to 1 mm, and particularly preferably 0.3 to 0.5 mm. In addition, the height of the ribs 8 (projections) is 0.2 to 3.
It is preferably 0 mm, particularly 0.3 to 2.0 mm.

On the other hand, the cylindrical label 3 covers the body 2 over the entire length from the upper end to the lower end and is fixed to the outer peripheral surface 7a of the second body 7 by adhesion as described above. Also,
The lower end of the tubular label 3 is bent substantially horizontally inward to cover a predetermined region of the peripheral portion of the bottom 4 over the entire circumference, that is, the lower end of the tubular label 3 has a ring-shaped collar 3a. It is extended inside.

The tubular label 3 is composed of a heat-shrinkable sheet having a foamed layer, for example, a foamed resin sheet having a heat-shrinkable property in one direction (circumferential direction). A preferable label base material is a sheet made of expanded polystyrene or a sheet having a non-foamed resin layer on one side or both sides of the expanded polystyrene layer. The expansion ratio of the expanded polystyrene sheet or expanded polystyrene layer is 2 to 10 times, preferably 2.
5 to 7 times. The expanded polystyrene is composed of general-purpose polystyrene or a copolymer obtained by copolymerizing polystyrene with butadiene, acrylonitrile, methacrylic acid, acrylic acid, acrylic acid esters, etc., and a styrene component of 50% by weight or more (preferably 70% by weight). The above is contained and foamed with various foaming agents. The thickness of the expanded polystyrene sheet or expanded polystyrene layer is 0.1 to 1.0 mm, preferably 0.2 to 0.5 mm. Further, as the non-foamed resin layer, polystyrene, styrene-butadiene copolymer, styrene
A styrene-based resin such as an acrylic acid copolymer or a mixture thereof or a styrene-based resin obtained by mixing a resin such as polyethylene or an ethylene vinyl acetate copolymer with these is preferable, but polyethylene, polypropylene or the like can also be used.
The thickness of the non-foamed resin layer is about 3 to 30 μm. The foam layer is preferably made of the polystyrene resin because of its excellent heat insulating property and rigidity, but it may be used by laminating a polypropylene or polyethylene foam layer and a non-foaming heat-shrinkable polyester film. it can.

The tubular label 3 has a one-way heat shrinkability, and the heat shrinkage rate is measured by, for example, the shrinkage rate when immersed in oil at a predetermined temperature for 10 seconds. The thermal shrinkage of the tubular label 3 in the circumferential direction is 5% or less at 80 ° C. in the expanded polystyrene sheet,
It is 30 to 60% at 0 ° C., which is higher than the temperature at which the heat-shrinkable film such as polyester shrinks.

The tubular label 3 mounted on the container body 1 is in a state of being heat-shrinked in the state shown in FIGS. 1 to 3, but as described above, the inner surface of the tubular label 3 and the tips of the ribs 8 are formed. A predetermined gap G is formed between and. This is because, as will be described later, the cylindrical label 3 is heat-shrinked in advance before being attached to the container body 1 to have a shape that matches the shape of the container body 1. The so-called preformed tubular label 3 is attached to the container body 1.

The manufacturing method of this heat-insulating container with label will be further described with reference to FIG. 4. First, as shown in FIGS. 4A and 4B, the jig 20 adapted to the outer shape of the container body 1 will be described.
Is placed with the bottom face up and the cylindrical label 3 is attached to the jig 20.
Cover from above. Tapered outer peripheral surface 20a of the jig 20
Is formed along the body portion 2 of the container body 1 and its entire length is substantially the same as that of the body portion 2.
The axial length is longer than that. The outer circumference of the jig 20 is such that a predetermined gap G is formed between the inner surface of the tubular label 3 and the tip of the rib 8 when the container body 1 is covered with the tubular label 3 after contraction. The portion of the surface 20a corresponding to the first body portion 6 is formed to have a larger diameter than the tip portion of the rib 8, and is tubular when the tubular label 3 after contraction is put on the container body 1. The portion of the outer peripheral surface 20a of the jig 20 corresponding to the second body portion 7 is the outer surface 7a of the second body portion 7 so that the inner surface of the label 3 contacts the outer surface 7a of the second body portion 7. They are formed to have substantially the same diameter. Then, when the cylindrical label 3 is heated with a radiant heater such as hot air or infrared rays, the cylindrical label 3 is thermally shrunk as shown in FIG.
It is in close contact with a and its upper end is the bottom surface 20 of the jig 20.
It is bent inward so as to cover the peripheral part of b and its bottom surface 2
Close to 0b. After heat-shrinking in this way to preform into a shape that fits the container body 1, the contracted tubular label 3 is removed from the jig 20, and the bottom 4 is turned up as shown in FIG. The cylindrical label 3 is fixed by the adhesive applied on the outer peripheral surface 7a of the second body portion 7 in advance from the top of the container body 1 placed on the cylindrical label 3. The container body 1 may be covered with the tubular label 3 by inserting the container body 1 toward the placed tubular label 3.

As described above, since the cylindrical label 3 preformed in conformity with the shape of the container body 1 is fixed by covering the container body 1, the contraction force of the cylindrical label 3 deforms the container body 1. There is no such problem. When the tubular label 3 includes a foam layer, the temperature of heat shrinkage is higher than that of a non-foaming heat-shrinkable film such as polyester, and therefore the container body 1 made of a thermoplastic resin.
The container itself is also heated to a higher temperature and is likely to be deformed, but the problem of deformation of the container body 1 can be solved by mounting the cylindrical label 3 on the container body 1 after heat shrinking it in advance. Therefore, it is possible to make the container body 1 thin, and as a result, it is possible to reduce the weight of the container and reduce the cost. Particularly, in this embodiment, since the rib 8 is provided on the body 2, the body 2 (smooth region 9) is formed.
The strength can be ensured even if the thickness is reduced to about 0.3 to 0.5 mm, and furthermore, by using the cylindrical label 3 made of expanded polystyrene resin, the cylindrical label 3
The rib height is 0.2 to 0.8 due to the reinforcing effect of the rigidity of
Even if the container is lowered to about mm, even if the container is gripped in the radial direction, the deformation amount is small and the container can be gripped stably.

Further, when the rib 8 is formed on the body portion 2 of the container body 1 as described above, when the cylindrical label 3 is covered on the container body 1 and then heat-shrinked as in the conventional case, the cylindrical label 3 is formed.
As a result of the inner surface of the rib 8 tightly adhering to the tip of the rib 8, the shape of the rib 8 appears as vertical stripes on the outer surface of the tubular label 3, which is not desirable in terms of appearance. On the other hand, in the present invention, since the preformed cylindrical label 3 is covered on the container body 1, a good appearance can be obtained even when the rib 8 is formed on the body 2. In particular, in this embodiment,
Since the tubular label 3 is attached so as to form the gap G between the tip portion of the rib 8, the shape of the preformed tubular label 3 is reliably maintained, and a good appearance is ensured. You can

Since the tubular label 3 is composed of a sheet having a foam layer (in particular, a foam layer made of a polystyrene foam resin having rigidity), it is different from the heat-shrinkable film when preformed. As such, it has shape-retaining property, and therefore can be easily attached to the container body 1. In particular, the ring-shaped collar portion 3a ensures the strength in the radial direction, and the work for covering the container body 1 becomes easy.

On the other hand, since the tubular label 3 has a foam layer, an excellent heat insulating effect can be obtained. Especially rib 8
By providing the ribs, a streak-like air layer is formed between the adjacent ribs 8. The streak-like air layer further increases the heat insulating effect, and when the body 2 is gripped, Since the rib 8 is gripped via the label 3, the heat is not easily transferred to the finger. Moreover, since the gap G is formed between the tip of the rib 8 and the inner surface of the tubular label 3,
A ring-shaped air layer is further formed outside the streak-shaped air layer, so that the heat insulation effect is further improved by the ring-shaped air layer, and most of the tubular label 3 is composed of the container body 1. There is an advantage in that heat is less likely to be transmitted to the tubular label 3 itself due to non-contact with. The rib 8 may be raised and the streak-like air layer may be thickened to enhance the heat insulating effect, but the amount of resin used increases accordingly. On the other hand, if the gap G is formed between the rib 8 and the tubular label 3 by preforming the tubular label 3, the rib 8 can be formed.
Can be suppressed to a relatively low level, which is also advantageous in terms of weight reduction and cost reduction.

Furthermore, since the lower end of the body 2 is covered with the tubular label 3 from the lower side, when the container is supported from below, the lower end of the body 2 does not directly touch the finger, Due to the heat insulating effect of the foam layer of the label 3, there is an advantage that heat is hard to be transmitted to the finger. In addition, a space V is formed between the ring-shaped collar portion 3a of the tubular label 3 and the bottom portion 4 of the container body 1 because the bottom portion 4 is a raised bottom, which is also coupled with the fact that a heat insulating effect is obtained. The container can be easily supported and supported from below.

In the present embodiment, the case where the rib 8 is provided as the ridge on the first body 6 as the uneven portion has been described, but the shapes of the ridge and the groove, and by extension, the shape of the uneven portion are not limited to this. Instead, various types can be used. For example, contrary to the case of the rib 8, the width of the concave stripe is narrower than the width of the convex stripe and is formed like a groove, or as shown in FIG. The convex-concave section 10 and the concave section 11 having a curved surface may be alternately formed in the circumferential direction to form the corrugated section 12 having a substantially constant wall thickness and a visual-wave cross section. When the wall thickness is substantially constant as shown in FIG. 5, the container body 1 can be formed by sheet molding such as vacuum molding, pressure molding, and vacuum pressure molding instead of injection molding. When the container body 1 is formed by sheet molding, the body portion 2 is particularly thin,
The effect of attaching the preformed tubular label 3 is great.

Further, the tubular label 3 may be fixed to the label fixing portion of the container body 1 by fitting instead of bonding. For example, as shown in FIG. 6, the tubular label 3 may be fixed to the outer peripheral surface 7a of the second body portion 7 by fitting. In that case, the inner diameter of the tubular label 3 is formed to be slightly smaller than the diameter of the outer peripheral surface 7a of the second body portion 7. However, since the tubular label 3 is a foamed resin sheet, the tubular label 3 is attached from the bottom portion 4 side. It can be easily fitted and fixed by pushing. Further, as shown in FIG. 6B, the outer peripheral surface 7a of the second body portion 7
In addition, minute protrusions 30 may be formed along the circumferential direction to prevent the tubular label 3 from coming off the container body 1. When the tubular label 3 is fixed to the container body 1 by fitting in this way, a protrusion is formed on the lower side of the body portion 2 of the container body 1, and the lower end portion of the tubular label 3 is supported by the protrusion. Therefore, it is preferable to prevent the cylindrical label 3 from being displaced or dropped.

Further, although the ring-shaped collar portion 3a is formed at the lower end portion of the cylindrical label 3, it is possible to omit it.
Further, as shown in FIG. 7, in addition to the ring-shaped collar portion 3a, a bottom plate 15 may be further provided on the inner surface side or the outer surface side thereof to further enhance the radial rigidity.

Although the structure in which the label fixing portion is provided at the upper end of the body 2 has been described, the label fixing portion may be provided at a midway portion (for example, the central portion) or the lower end of the body 2, or
The label fixing portions may be vertically spaced from each other and provided in two or more places. Furthermore, the label fixing portions need not be continuous over the entire circumference, and may be provided at intervals in the circumferential direction.

Further, the shape of the container body 1 can be appropriately changed in design, and may be a rectangular tube shape such as a quadrangle or a hexagon other than the cylindrical shape. In the case of the rectangular tube-shaped container body 1, of course, the cylindrical label 3 is also preformed into a rectangular shape in accordance with the rectangular tube shape.

[0027]

As described above, by mounting the tubular label, which is heat-shrinked according to the shape of the container body, on the container body, it is possible to eliminate the influence of heat and shrinkage force on the container body during the heat shrinkage. As a result, it is possible to improve the heat insulating property by the foam layer, and it is possible to reduce the thickness of the container main body, thereby achieving weight reduction and cost reduction.

Particularly, by providing an uneven portion on the body of the container body,
By forming a gap between the ridge of the uneven portion and the tubular label, the air layer between the tubular label and the container body becomes thicker, and contact between the ridge and the tubular label is suppressed. Since heat transfer due to contact is also suppressed, the heat insulating effect is further improved.

[Brief description of drawings]

FIG. 1 is a one-sided cross-sectional view showing a heat insulating container according to an embodiment of the present invention including a partially broken line.

FIG. 2 is a partial cross-sectional view of the container.

3 is a sectional view taken along line P-P of FIG.

FIG. 4 is a schematic view showing a flow of manufacturing method of the container.

FIG. 5 is a partial cross-sectional view of a heat insulating container according to another embodiment.

6A and 6B show a heat insulating container according to another embodiment, in which FIG. 6A is a one-sided sectional view, and FIG.

FIG. 7 is a partial cross-sectional view of a heat insulating container according to another embodiment.

[Explanation of symbols]

1 ... Container body, 2 ... Body part, 3 ... Cylindrical label, 4 ... Bottom part,
6 ... 1st body part (uneven part), 7 ... 2nd body part (label fixing part), 8 ... rib (projection line), 9 ... smooth area (concave line), 10
... convex strips, 11 ... recessed strips, 12 ... uneven parts, 15 ... bottom plate, 20
… Jig, G… Gap, V… Space

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B65D 71/08 B65D 71/08 A 81/34 81/34 D G09F 3/04 G09F 3/04 C (72 ) Inventor Kaoru Takeo 5-3-18 Imazukita, Tsurumi-ku, Osaka City F-term in Fujiseal Co., Ltd. (reference) 3E033 AA08 BA15 BA16 BA18 BA21 BA22 BA26 DA08 DD01 EA09 FA02 3E067 AA03 AA11 AB01 AB26 BA07A BA18A BB14A18ABBBBA CA01 CA17 EA06 EA17 EA32 EA36 EA37 EB27 EE04 EE39 FA01 FB01 FC01 GA12 3E075 AA12 BA33 BA36 BA83 BB01 CA01 DD12 DD17 DD44 GA04

Claims (3)

[Claims] 1. A heat insulating container comprising a bottomed tubular container body (1) made of a thermoplastic resin, and a tubular label (3) attached to the container body (1). The label (3) is made of a heat-shrinkable sheet having a foam layer, and is heat-shrinked according to the shape of the container body (1) before being attached to the container body (1). container. 2. A label fixing for fixing the tubular label (3) to the container body (1) by abutting the body portion (2) of the container body (1) on the inner surface of the tubular label (3). Vertical protrusions (8, 10) covered with the portion (7) and the tubular label (3)
And recessed ridges (9, 11) are alternately formed in the circumferential direction to form irregularities (6, 12), and the ridges (8, 10) of the irregularities (6, 12) and the tubular label. The heat insulating container according to claim 1, wherein a gap (G) is formed between the inner surface and the inner surface of (3). 3. A method for producing a heat-insulating container comprising a bottomed tubular container body (1) made of a thermoplastic resin, and a tubular label (3) attached to the container body (1), A tubular label (3) made of a heat-shrinkable sheet having a foam layer is heat-shrinked according to the shape of the container body (1) to form a tubular label (3) having a predetermined shape, and the heat-shrinkable tube A method for producing a heat-insulating container, characterized in that the label (3) is attached to the container body (1).