JP2000344280A - Heat-insulating container for food - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the manufacture even in the case of a large container, improve the heat-insulating property, ensure a proper strength, and at the same time, reduce the weight, and reduce the material cost as well by forming the container main body of a sheet body, and forming ribs on the outer peripheral surface of the container main body by applying a synthetic resin. SOLUTION: A container main body 3 is formed of a multi-layer plastic sheet body which is a single layer of polypropylene or the like or wherein a gas barrier resin such as an ethylene/vinyl alcohol resin is laminated on the single layer, by a thermal forming method such as a vacuum-forming or a pressure-forming. Then, the container main body 3 is fitted on a tapered rotation-holding body, and is rotated at a specified speed together with the rotation-holding body. Then, a plate roller applies a foaming hot melt adhesive on the outer peripheral surface of the peripheral wall 3a of the container main body 3 while rotating, and ribs 7 are formed. For the foaming hot melt adhesive, to a low density polyethylene or the like in which a tackifier and a modifier are added, a foaming agent is added, and the low density polyethylene is expanded to contain air bubbles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to dried foods,
The present invention relates to a heat-insulating container for food, which is most suitable for accommodating bulk food such as instant instant noodles which can be poured with boiling water, and for accommodating low-temperature food such as frozen or refrigerated items.

[0002]

2. Description of the Related Art Conventionally, containers for instant foods such as instant instant noodles (dry noodles), foods heated by a microwave oven, hot coffee and very cold beverages have been considered in consideration of the danger of burns and easy holding. In addition, the container itself is devised for heat insulation.

For example, as the above-mentioned heat insulating container, a container formed by injection molding using polypropylene as a material is employed. In such a container formed by injection molding, the longitudinal ribs are provided radially on the outer peripheral surface of the container body, so that heat such as boiling water poured into the container is not transmitted to the fingers holding the container (conventional example). 1).

[0004] In some cases, the container body is molded by hot sheet molding such as vacuum molding or compressed air molding of a plastic sheet. In the case of such sheet molding, ribs are formed by bending a plastic sheet (conventional example 2).

[0005]

In the prior art 1 in which the container body is formed by the injection molding, an expensive mold for injection molding is required. Further, when a particularly large container is manufactured, there is a disadvantage that the mold becomes large and the molding efficiency (cycle) is deteriorated.

In addition, it is necessary to reduce the weight of the container and to avoid being expensive. As a means for that, it is conceivable to reduce the thickness of the container body as much as possible to reduce the resin material. However, if the thickness of the container body is reduced, the resin does not easily flow during molding,
There is a limit to reducing the thickness of the container body.

In addition, it is difficult to obtain a multilayer structure in which gas barrier resins are laminated by injection molding.

Conventional example 2, in which the container body is formed from a plastic sheet, is suitable for a relatively large container. However, since a thin plastic sheet is bent to form a rib, the inner peripheral surface of the container body is formed. Also becomes uneven according to the shape of the rib. As a result, for example, when hot water is poured into the container body, the hot water enters the inner surface of the rib serving as a concave portion, so that the heat is easily transmitted to a finger gripping the rib formed by bending a thin plastic sheet, Insulation effect cannot be obtained.

Therefore, the present invention has been made to solve the above problems, and can be easily manufactured even in a large container.
It is an object of the present invention to provide a heat-insulating container for food, which has excellent heat insulation properties, can secure appropriate strength, can reduce the weight, and can reduce the material cost.

[0010]

SUMMARY OF THE INVENTION The present invention has been made as an insulated container for food in order to solve the above problems,
The feature of the heat insulating container for food according to the present invention is that, in the heat insulating container for food, in which a rib 7 protrudes from the outer peripheral surface of the container main body 3, the container main body 3 is formed from a sheet body, Consists of a synthetic resin applied to the container body 3.

Since the synthetic resin applied to the container body 3 acts as a rib, the strength of the peripheral wall of the container body 3 is improved. Further, since the container body is formed from a thin plastic sheet and the rib is formed from a synthetic resin, the cost is reduced, the weight can be reduced, and the heat insulating property is excellent.

Further, the combination of the plastic sheet and the rib formed by applying a foamed resin having a low specific gravity makes it possible to reduce the cost, reduce the weight, and to provide excellent heat insulation.

When the foamed resin forming the rib 7 is made of a foamed hot melt adhesive and the label 9 is made of a tubular heat-shrinkable label, when the label 9 is shrunk, The label 9 can be adhered to the container body 3 by activating the foamed hot-melt adhesive by the heat.

In addition, a rib 15 is provided on the outer peripheral surface,
In a heat insulating container for food comprising a container body 3 formed of a plastic sheet and a cylindrical label 9 fitted to the container body 3, foam is formed between the rib 15 and the label 9. This is because the resin 7a is interposed.

Therefore, the contents such as boiling water poured into the container body 3 enter the ribs 7 formed by bending a thin plastic sheet and heat the ribs 7 despite heating the ribs 7. Since the resin has a heat insulating effect, it is difficult for the heat of the ribs 7 to be transmitted to the finger holding the container body 3.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show a first embodiment of the present invention, and the container of the present embodiment illustrates an instant cup noodle mass (dry noodle) as an example of dry food.

The container 1 is provided with a cup-shaped (bottomed cylindrical) container body 3 having heat resistance, and its upper end opening is formed by a sealing lid 5 made of a laminated material such as aluminum foil and a synthetic resin film or paper. Sealed to be peelable.

The container body 3 is made of polypropylene (PP), so that the diameter decreases as going downward.
Polystyrene (PS), high density polyethylene (HDP
E) A single layer of polycarbonate (PC) or polyethylene terephthalate (PET) or a multi-layer plastic sheet (thickness of about 0.3 to 1.5 mm) in which a gas barrier resin such as ethylene vinyl alcohol resin is laminated thereon. It is formed in a tapered shape. A plurality of ribs 7 protrude radially from the outer peripheral surface of the peripheral wall 3a of the container body 3, and each rib 7 is provided continuously so as to have a predetermined length in the vertical direction of the container body 3. .

Each rib 7 is formed by applying a foamed hot melt adhesive as a foamed resin to the outer peripheral surface of the peripheral wall 3a of the container body 3. The protrusion amount (height) of the rib is preferably set to 0.3 to 2.0 mm. still,
Each rib 7 may be provided intermittently, or a predetermined amount may be provided randomly at an arbitrary position.

Examples of foamed hot melt adhesives include tackifiers such as petroleum resins, hydrogenated petroleum resins, hydrogenated terpene resins, etc. for low density polyethylene, ethylene vinyl acetate copolymer, ethylene acrylic acid-based resin, chlorinated polyolefin, etc. A foam to which a foaming agent is added and a foam to which a modifier is added is chemically or foamed mechanically to contain air bubbles. The ribs 7 may be formed by applying a polyethylene or polypropylene non-foamed synthetic resin in a molten state.

A cylindrical label 9 made of a heat shrinkable shrink film is fitted around the outer periphery of the peripheral wall 3a of the container body 3.

Next, an example of a method for manufacturing the container will be described. First, the container body 3 is formed by subjecting the sheet body to general thermoforming such as vacuum forming or pressure forming.

Next, as shown in FIG. 4, the container body 3 is externally fitted to a tapered rotary holder 10 and
At the same time, the container body 3 is rotated at a predetermined speed. Further, a plate roller 12 for supplying the foamed hot melt adhesive is provided rotatably, and while the plate roller 12 rotates,
The rib 7 is formed by applying the foamed hot melt adhesive to the outer peripheral surface of the peripheral wall 3 a of the container body 3.

Thereafter, a tubular heat-shrinkable label 9 is externally fitted to the container body 3 and the label 9 is heated and shrunk. At this time, since the surface of the foamed hot melt adhesive is activated by the heat generated when the label 9 is thermally contracted and exhibits adhesiveness, the label 9 is adhered to the container body 3 via the rib 7. Therefore, although the label 9 is tapered along the rib 7, the container body 3
It is held without falling down from. Further, a beautiful printed display can be obtained by the label 9. In addition, as the label 9, a wound label or the like made of a sheet substrate formed in a fan shape or the like may be used.

When, for example, hot water is poured into the container 1 having the above structure, even if the peripheral wall 3a corresponding to the gripping portion of the container body 3 becomes hot, the ribs 7 made of the foamed hot melt adhesive have an insulating effect. As a result, the temperature of the tip end surface of the rib 7 is relatively low and the contact area with the finger to be gripped is small, so that no particular heat is felt. Incidentally, the foaming hot melt adhesive has a melting point of 100 ° which is not melted by the heat of boiling water.
The thing of c or more is good.

Furthermore, since the container body 3 is formed from a thin plastic sheet and the ribs 7 are formed from a foamed hot melt adhesive, the total resin material can be reduced to reduce the material cost and reduce the weight. Can also be achieved.

FIG. 5 shows a second embodiment of the present invention.
The projecting portion 15 is provided on the peripheral wall 3a of the container body 3 of the present embodiment.
Are formed. Note that the protruding portion 15 functions as a rib. A foamed hot-melt adhesive 7a as a foamed resin is applied to each protruding portion 15 along the rib 17, and the label 9 is adhered to the peripheral wall 3a of the container body 3 via the foamed hot-melt adhesive 7a. Will be done.

In the second embodiment, since the ribs are in contact with the label 9 via the foamed hot melt adhesive despite the ribs being formed on the container body 2, the foamed hot melt adhesive is not used. Demonstrate the heat insulation effect. As a result, when the hot water is poured, the portion (the peripheral surface 3a and the rib 15 of the container body 3) that is in direct contact with the hot water is not directly gripped, so that even if the peripheral wall 3a of the container body 3 becomes hot, The heat is hardly transmitted to the label 9 and the user does not feel the heat.

Since the foamed hot melt adhesive 7a has a function as a rib similarly to the first embodiment, the container body 3 can be further reinforced.

The present invention is not limited to the above embodiment. For example, the label 9 does not necessarily need to be attached to the container body 3, and the material of the foamed resin is not limited to the foamed hot-melt adhesive, but may be made of a thermoplastic resin containing air bubbles. good. The expansion ratio of the foamed resin is, for example, 2 to 30 times, preferably 2 to 30 times.
10 times.

Further, the container may be a container for hot coffee or a very cold beverage, etc., in addition to a container for storing dried noodles cooked in hot water. Further, the shape of the container body 3 is not limited to a circular shape in a plan view, but may be any rectangular shape or an elliptical shape.

Further, the means for applying the foamed resin to the container body 3 is provided by a gun type nozzle (applicator).
The foamed resin may be applied to the container body 3, and any means can be adopted.

[0033]

As described above, since the container body of the present invention is formed from a sheet body, the above-mentioned conventional mold for injection molding is unnecessary, and even a large container body can be easily formed. Since the ribs are formed of synthetic resin, the ribs can be made cheaper, lighter, and have excellent heat insulation.

Further, since a multi-layered sheet having gas barrier properties can be used, it is easy to obtain a container having gas barrier properties.

When the synthetic resin is formed of a foamed resin, it is possible to secure excellent heat insulation and appropriate strength, to reduce the weight, and to reduce the material cost.

A container body formed of a plastic sheet so as to radially have ribs on the outer peripheral surface;
A cylindrical label externally fitted to the container main body, and a foamed resin is interposed between the rib and the label, so that the plastic sheet is bent to form the rib. Because the foamed resin has a heat insulating effect,
It is difficult for the heat of the ribs to be transmitted to the fingers holding the container body.

In addition, since the foamed resin has the function of a rib, the foamed resin has the advantage of being able to reinforce the container body together with the rib formed of a plastic sheet.

[Brief description of the drawings]

FIG. 1 is a sectional view of a container according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the container body.

FIG. 3 is a sectional view showing a main part of the container.

FIG. 4 is a sectional view showing a state of manufacturing the container.

5A and 5B show a second embodiment of the present invention, wherein FIG. 5A is a cross-sectional view showing a main part of a container, and FIG. 5B is a perspective view of a container main body.

[Explanation of symbols]

3 ... container body, 3a ... peripheral wall, 7 ... rib, 7a ... foamed resin, 9 ... label, 15 ... rib

Claims (5)

[Claims] A rib (7) is provided on the outer peripheral surface of the container body (3).
Wherein the container body (3) is formed from a sheet, and the rib (7) is made of a synthetic resin applied to the container body (3). Insulated container for 2. The heat insulating container for food according to claim 1, wherein the synthetic resin is formed of a foamed resin. 3. The insulated container for food according to claim 1, wherein a cylindrical label (9) is externally fitted to the container body (3). 4. A foamed resin constituting the rib (7),
The heat insulating container for food according to claim 3, wherein the label (9) is formed of a foamed hot melt adhesive, and the label (9) is formed of a tubular heat-shrinkable label. 5. In order to have a rib (15) on the outer peripheral surface,
Container body (3) molded from plastic sheet
And a tubular label (9) externally fitted to the container body (3), wherein a foamed resin is provided between the rib (15) and the label (9). (7a)
A heat insulating container for food, characterized in that a food container is interposed.