JPH09136353A - Foamed resin food vessel, mold therefor and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an integrally molded foamed resin food vessel which can be easily separated into a vessel body and a cover. SOLUTION: The one mold 20 has two linear protruding stripes 26a, 26b for molding the bent part and thin part of a molded vessel, and a linear recess stripe 27 between the two stripes. The opposite mold 10 has a saw blade-like cutter 15 at the position invaded into the recess 27 in the case of closing the male and female molds. At the time of molding, the male and female molds are closed in the state that the end of the saw blade 16 of the cutter 15 is advanced into the stripe 27 but is not brought into contact with its bottom, thereby molding many sew line perforating holes between the two thin parts of the connecting part simultaneously upon molding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed resin food container, a molding die for the same, and a manufacturing method thereof, and more particularly to a foamed resin food product in which a container body and a lid are integrally molded via a connecting portion. TECHNICAL FIELD The present invention relates to a foamed resin food container having perforated perforations at its connecting portion so that the container body and the lid can be easily separated, a molding die for the same, and a manufacturing method thereof.

[0002]

2. Description of the Related Art As a food container formed by foaming an expandable resin, a food container in which a container body and a lid are integrally molded via a connecting portion is known. This type of container is widely used as a container for natto etc. because it can be manufactured at low cost and is lightweight. However, since the lid body is inclined with respect to the container body when the lid is open, it is inevitable that the container will be in an unstable posture when placed on a table or the like. Therefore, it is possible to easily separate the container body and the lid body, when placing it on a table or the like, the lid body is separated from the container body, and the lidded container that allows only the container body to be placed in a stable posture, Alternatively, a molding die for manufacturing such a container has been proposed.

One of them is disclosed in Japanese Utility Model Publication No. 57-45144.
An example is shown, in which a plastic sheet lid
Position of Body and Lid in Female Die for Molding Vessel with Cover
A plurality of quenching blades with sharp tips
A comb-shaped punching tool is projected, and the comb-shaped quenching is performed on the male mold.
A mold for forming a hole that fits with a blade is described.
You. By using this mold, at the same time as molding the container
Perforations are punched on the seat surface between the container body and the lid,
Easily separate the lid from the perforation when needed
It becomes possible.

Yet another example is disclosed in Japanese Utility Model Publication No. 59-40252, in which an elongated fold connecting portion is provided as a food container in which a container body and a lid are integrally molded via the connecting portion. A plurality of ribs are provided on the outside of the connecting portion so as to cross the connecting portion, and along the longitudinal direction of the connecting portion, a foamed resin food container is provided in which a large number of cuts are provided linearly alternately with the ribs. . According to this container, in addition to easy separation of the lid, it is possible to prevent the bent portion of the lid from protruding laterally, and it is possible to supply a neat packaged product.

[0005]

SUMMARY OF THE INVENTION Among the above prior arts,
In the former molding method using a molding die, the blade body for perforating perforations is a comb-shaped perforating tool in which a plurality of quenching blades with sharp tips are planted. To ensure that the perforation is formed at the connection between the lid and the lid,
It is necessary to press the comb-shaped hole punching tool against the fitting hole formed in the other mold and push it down. According to the experience of the present inventors, the use mode of the quenching blade of pressing and pushing down as described above rapidly deteriorates the sharpness of the blade body, and in order to surely perforate the perforation, it is frequent. Blade (comb-shaped punch)
Had to be replaced, which required man-hours and increased cost.

Further, the molded container includes a container body and a lid.
While it can be easily separated,
Since only perforations are formed in the contact area,
When the lid is opened or closed, the perforation does not bend.
Do not allow the lid to come off carelessly while storing food.
I have experienced that In the latter container, slender
A large number of ribs are cut outside of the joints and cut across the joints.
Since it is installed like this, the lid will accidentally separate
However, on the other hand, a large number of
The container body and lid can be easily separated due to
There is a drawback that you cannot do it. Also, the shape of the mold is complicated
Yes Incurs higher costs.

An object of the present invention is to eliminate the inconvenience of the foamed resin food container having a perforation at the connecting portion between the container body and the lid or the molding die thereof, as described above. Specifically, an object is to provide a foamed resin food container that satisfies the contradictory problem that the container body and the lid can be easily separated, but the lid does not carelessly separate. Another object of the present invention is to provide a molding die capable of continuously and stably producing the foamed resin food container having the above-mentioned configuration. Still another object of the present invention is to provide a method for producing a foamed resin food container using the molding die as described above.

[0008]

In the foamed resin food container according to the present invention for solving the above problems, the container body and the lid are integrally formed via a connecting portion,
The connecting portion is provided with two linear thin-walled bent portions, and between the two bent portions is formed by a saw blade-shaped blade whose both sides are blade bodies in parallel with this. It is characterized in that a perforated hole is formed.

Further, in the method for molding a foamed resin food container according to the present invention, a pair of molding dies including male and female dies are used, and the container body and the lid are integrated via the connecting portion. A method for molding a foamed resin food container, comprising two linear ridges for forming a thin portion to be a bent portion of the molding container as one mold and a straight line between the two ridges. Using a tool provided with a groove-shaped ridge, and a tool provided with a saw-toothed blade at a position to enter the groove when the male and female dies are closed as the other die facing each other At some times, the male and female dies are closed in a state where the tip of the cutting tool enters the groove but does not contact the bottom of the groove, so that at the time of molding and two thin parts of the connecting portion. It is characterized in that a perforated hole is formed between them. It is a preferred embodiment to use a saw-toothed blade whose both sides are blades as the blade.

Further, the molding die of the foamed resin food container according to the present invention is a pair of molding dies comprising male and female dies for integrally molding the container main body and the lid through the connecting portion, One of the molds is provided with two linear ridges for molding a thin portion which is a bent portion of the molding container and a linear dent located between the two ridges. Further, the other mold is provided with a blade at a position corresponding to the groove when the male and female molds are closed, and further, the tip of the blade has a groove when the male and female molds are closed. It is characterized in that it is provided in a state where it does not contact the bottom of the. Even in this case, it is a preferable aspect that the blade is a saw blade-shaped blade whose both sides are blade bodies.

According to the foamed resin food container of the present invention, the connecting portion is provided with two straight thin-walled portions and perforated holes formed between them. Since the perforated holes are formed by saw blade-shaped blades whose both sides are blades, a large number of holes can be formed at narrow intervals, and the lid body can be easily and reliably separated. Further, when the lid is opened / closed, the bending is performed at three places, that is, the two thin portions and the perforated holes formed between the two thin portions. Inadvertent cutting of the eye-shaped holes is avoided.

Further, according to the molding die and method for manufacturing a foamed resin food container according to the present invention, the blade is a pointed saw blade-shaped blade, and the blade is clamped at the time of molding. The tip of the blade does not hit the surface of the mating die (bottom of the groove). Thereby, the sharpness of the blade can be maintained for a long period of time, and the molding work efficiency is improved. Further, perforated holes are punched in the foamed resin food container, which is a molded product, at a narrow interval and in a surely penetrating state.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a foamed resin food container according to the present invention, in which a container body 1 and a lid body 2 are integrally formed via an elongated connecting portion 3. As can be seen from the enlarged cross-sectional view of FIG. 2, the connecting portion 3 has two thin recesses 3a and 3b that run in a straight line.
And a protruding portion 3c formed between the thin recesses 3a and 3b in parallel with the thin recessed portions 3a and 3b. A large number of perforation-shaped perforation holes 4 formed by a blade-shaped blade are formed. Further, the two thin recesses 3
Perforations 5a, 5b near the bottom of a, 3b
Are formed.

The foamed resin food container having the above structure is
After the natto and the like are stored in the food storage portion 6 formed in the container body 1, the lid body 2 is bent by 180 ° and stacked on the container body 1. At that time, the two thin recessed portions 3a and 3b and the perforated hole 4 portion formed in the protruding portion 3c which is also a thin portion between them become the bent portions, so that the bending is It will be easy. Further, since the stress is dispersed thereby, the bending stress is not concentrated on the perforated hole 4 portion, and even if a large number of perforated holes 4 are formed at narrow intervals, it is unnecessary from that portion at the time of bending. It is possible to avoid breaking and separating. Further, when the lid 2 is to be separated, a large number of perforation holes 4 are formed at a narrow pitch, and the perforation holes 4 can be easily separated from the part. Furthermore, in the illustrated embodiment, in addition to the perforated hole 4,
Perforated cuts 5a and 5b are also formed in the bottoms of the two thin recesses 3a and 3b, and the container body 1 and the lid body 2 are further easily separated.

Next, a mold for molding the above foamed resin food container will be described. FIG. 3 is a perspective view showing a pair of molding dies including a female mold 10 and a male mold 20. In the female mold 10, a recess 11 for molding the container body 1 and a lid 2 are molded. A concave groove 13 is formed between the concave groove 13 and the concave portion 12 for cutting, and a saw-toothed blade 15 is sandwiched between two jigs 14a and 14b in the concave groove 13 and has a blade body on both sides. Is fixed. FIG. 4 is a perspective view showing the blade 15 in an enlarged manner. As shown in the drawing, the blade 15 has a large number of saw blades 16 having sharp edges on the upper end side. 17a and 17b are formed as sharp blades.

The male die 20 has a convex portion 21 corresponding to the depression 11 of the female die 10 and a convex portion (not shown) corresponding to the depression 12 of the female die 10 as well. A concave groove 23 is formed at a position facing the concave groove 13, and a jig 24 for molding a connecting portion of the container is fixed by a screw 25 in the concave groove 23. FIG. 5 is an enlarged perspective view showing the jig 24 for forming the connecting portion. As shown in the drawing, the jig 24 has two ridges 26a and 26b that run in parallel.
Between the two convex stripes 26a and 26b, a concave stripe 27 is formed in parallel with the convex stripes over the entire length thereof. Further, in this embodiment, the tops of the ridges 26a and 26b have acute angles, and a large number of notches 28a and 28b are formed at regular intervals along the ridgeline thereof.

In the above mold, the positional relationship between the blade 15 of the female mold 10 and the jig 24 of the male mold 20 is as follows. That is, as shown in FIG. 6 which shows the positional relationship between the blade 15 and the jig 24 in the mold clamped state during molding (however, the molded product is not shown), at least the tip of the saw blade 16 of the blade 15 is a male mold. No. 20 of the jig 24, the protrusions 26a of the jig 24, 2
The tip ridge of 6b abuts against the surface of the female die 10 and the two die 1
Nos. 0 and 20 are positioned, and in that state, the bottom surface of the concave line 27 formed on the jig 24 for forming the coupling portion and the tip of the saw blade 16 of the blade 15 are in contact with each other. Instead, the gap S is kept.

Although not shown, both molds 10 and 20 have the same structure as in the conventional foam molding mold.
Pores for drawing a vacuum, heating steam, passages for supplying cooling water, etc. are provided. The foamed resin food container can be molded using the above molding die in the same manner as a molding method using an ordinary foamed resin sheet. That is, in the mold open state, a foamed resin sheet (not shown) that has been heated and softened in advance is fed onto the female mold 10, and the male mold 20 is attached while the sheet is brought into close contact with the surface of the female mold 10 by vacuuming. Tighten the mold. As a result, the thick resin main body 1 and the lid 2 are formed by the recess 11 and the recess 12 in the foamed resin sheet, and at the same time, the connecting portion 3 is integrally formed with them.

2 formed on the jig 24 provided on the male die 20
A large number of notches 28a, 28b are formed on the ridges of the parallel ridges 26a, 26b of the book.
By the abutting of 6b on the female die 10 side, the connecting portion 3 is formed with two thin recesses 3a, 3b running in a straight line having continuous perforation-like cuts 5a, 5b. At the same time, the tip of the saw blade-shaped saw blade 16 of the blade 15 attached to the female die 10 is pierced into the foamed resin sheet existing between the thin recesses 3a and 3b, while dragging the sheet upward. And perforation-shaped holes 4 are formed in the foamed resin sheet. Since the left and right inclined surfaces 17a and 17b of the saw blade 16 in this embodiment are sharp blades, the saw blade 16 can easily and reliably enter the foamed resin sheet, and a large number of perforations are formed. The hole group 4 is surely formed.

After molding, the mold is opened and the molded product is taken out by a usual method. In the above description, the blade used for the mold is a blade whose both sides of the saw blade are blade bodies, but this is a preferred embodiment and is not essential. Any shape can be used as long as it has a shape that allows perforations to be formed in the foamed resin sheet in a state where the tip of the blade does not collide with the mold of the other party.
In addition, notches 28a, 28 are formed on the ridges of the two parallel ridges 26a, 26b formed on the jig 24 attached to the male mold.
It is not essential to form b, and the thin-walled concave portion 3a,
If the required cutting can be achieved without providing the perforated cuts 5a and 5b in 3b, a flat ridge line may be used. In that case, at the time of molding, both molds are brought close to each other to a distance at which the thin portion 3a, 3b having a desired thickness is formed on the connecting portion 3 of the container by the ridge. But,
Even in this case, it is indispensable that the tip of the blade 15 is not in contact with the bottom of the groove 27 formed on the jig 24.

[0021]

According to the foamed resin food container of the present invention, when the lid is opened / closed, the bending is performed at three places, that is, the two thin portions and the perforated holes formed between them. Bending is not concentrated on the perforated hole portion, and the perforated hole portion is not accidentally cut. Also,
Since the perforation-shaped holes are formed by saw blade-shaped blades whose both sides are blades, a large number of holes can be formed at a narrow interval, and the lid body can be easily and reliably separated.

Further, according to the molding die and method for manufacturing a foamed resin food container according to the present invention, since the tip of the blade of the cutting tool does not abut against the surface of the mating die during mold clamping during molding, The sharpness of the blade can be maintained for a long period of time, and the molding work efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a foamed resin food container according to the present invention.

FIG. 2 is a front view showing an enlarged connecting portion.

FIG. 3 is a perspective view showing a molding die according to the present invention.

FIG. 4 is an enlarged perspective view showing a blade portion.

FIG. 5 is an enlarged perspective view showing a molding jig for a connecting portion.

FIG. 6 is an enlarged cross-sectional view showing the positional relationship between a blade and a molding jig in a mold clamped state during molding.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Container main body, 2 ... Lid body, 3 ... Connection part, 3a, 3b ... Thin-walled bending part, 4 ... Perforation-shaped hole, 10 ... Female mold, 15 ... Blade, 16 ... Saw blade , 20 ... Male mold, 24 ... Jig for forming connecting portion, 26a, 26b ... Convex line, 27 ... Recessed line

Claims (5)

[Claims] 1. A foamed resin food container in which a container body and a lid are integrally molded via a connecting portion, wherein the connecting portion is provided with two linear thin-walled bent portions, and The 2
A foamed resin food container characterized in that a perforation-shaped perforation hole formed by a saw blade-shaped blade whose both sides are blades is formed between the two bent portions in parallel therewith. 2. A method for molding a foamed resin food container in which a container body and a lid are integrated via a connecting portion by using a pair of molding dies composed of male and female dies. The mold used is one in which two linear ridges for forming a thin portion to be a bent portion of the molding container and linear ridges between the two ridges are provided and are opposed to each other. For the other mold, a saw blade-shaped tool is provided at a position where it penetrates into the groove when the male and female molds are closed, and the tip of the knife enters the groove when molding. The male and female dies are closed without touching the bottom of the groove, so that a perforation-like hole is formed between the two thin portions of the connecting portion at the same time as molding. A method for producing a foamed resin food container, comprising: 3. The method for molding a foamed resin food container according to claim 2, wherein a saw blade-shaped blade whose both sides are blades is used as the blade. 4. A pair of molding dies comprising male and female dies for integrally molding a container body and a lid via a connecting portion,
One of the molds is provided with two linear ridges for forming a thin portion which is a bent portion of the molding container and a linear dent located between the two ridges. Further, the other mold is provided with a blade at a position corresponding to the concave line when the male and female molds are closed, and the tip of the blade is A molding die for a foamed resin food container, characterized in that it is provided so as not to contact the bottom of the recess. 5. The molding die for a foamed resin food container according to claim 4, wherein the blade is a saw blade-shaped blade whose both sides are blades.