JPH09104062A - Container made of styrenic resin foamed sheet and production thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a palatable and safe container made of a styrenic resin foamed sheet markedly reduced in the opportunity of the direct touch of the sharp edge formed to the mouth cut part of the container with a lip, preventing the laceration by the sharp edge even if the lip touches with the cut part and to produce the container by an industrially easy method. SOLUTION: A styrenic resin foamed sheet is molded under heating to mold a container main body 11 and the opening part 12 of the container main body is cut so as to leave an external mouth part 18 around the opening part 12 to form a container. The outwardly extending opening flange 13 is formed to the periphery of the opening part of the container main body and the skirt part 14 extending downwardly is integrally formed to the outer peripheral edge of the opening flange and the lower end surface of the skirt part is cut in the direction parallel to the bottom surface 16 of the container main body to form a mouth part. The edge of the cut surface of the skirt part is heated to be rounded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a styrene resin foam sheet container used for food packaging or tableware when eating contents and its manufacturing method. More specifically, a styrene-based resin foam sheet or a laminated styrene-based resin foam sheet obtained by laminating a styrene-based resin foam sheet and a thermoplastic resin film is used to heat-mold the container body and the mouth portion, and the safety cut out from the foam sheet is used. Container and its manufacturing method.

[0002]

2. Description of the Related Art A container produced by thermoforming a styrene resin foam sheet or a laminated styrene resin foam sheet obtained by laminating a non-foamed thermoplastic resin film on a styrene resin foam sheet has excellent heat insulation and light weight. In addition to its cleanliness and low cost, when the thermoplastic resin film is molded to the outer surface, container strength is improved and the surface becomes smooth, enabling curved surface printing. It is used in large quantities in instant ramen containers, etc., taking into account such features as

A container made of a styrene-based resin foam sheet is formed by heating a styrene-based resin foam sheet and sending it between male and female molds of a molding machine to heat-mold the container body and the mouth portion, and then to open the container body. From the direction perpendicular to the bottom surface of the container body leaving the mouth part protruding outward, it is pulled out from the foamed sheet by pressing punching machine with a metal blade usually called a puncher or fusing with nichrome wire etc., and made into individual containers as products. ing. That is, in such a container, the punching cut surface becomes the end surface of the mouth, and this cut surface is formed in the direction orthogonal to the bottom surface of the container and comes into direct contact with the lips.

However, when the mouth of the container is punched out by the above-mentioned method, the end face of the mouth, which is a cut surface, has sharp edges. Therefore, it cannot be denied that not only the mouth feels uncomfortable when touching the mouth of the container, but also the lip may be lacerated at the edge of the cut surface when the lip is intentionally rubbed strongly against the mouth by mistake. In addition, the possibility of hurting fingers when handling a container cannot be denied. In particular, a container formed by molding a laminated styrene resin foam sheet has a styrene-based resin film layer with a hard cut surface (container mouth) due to the difference in hardness between the styrene resin foam sheet layer and the laminated thermoplastic resin film layer. The above-mentioned problem is serious because the resin foam sheet layer is projected to the outside and the cut surface of the resin film becomes sharper.

Further, when a seal lid is attached to the seal surface on the upper surface of the mouth of the container such as an instant ramen container, when the seal lid is turned over, the surface cells of the container are peeled off from the cut surface side by the seal lid and the surface is bamboo grass. There is a case that it bounces and becomes unsightly. This tendency is more likely to occur because the drawing ratio represented by the depth of the container / inner diameter of the mouth is as high as 0.8 or more, and the deeper the container, the more the styrene-based resin foam sheet is stretched and weakened during molding. Of.

[0006]

SUMMARY OF THE INVENTION In view of the above situation, the present invention remarkably reduces the chance that the sharp edge of the mouth cut portion of the container directly touches the lips or the like, and is sharp even when the cut portion is touched by the lips or the like. It is an object of the present invention to provide a styrene-based resin foam sheet container which is capable of preventing tears due to edges and which is safe and palatable, and a method for producing such a container by an industrially easy method. .

[0007]

In order to solve the above-mentioned problems, according to the present invention, a styrene resin foam sheet is heat-molded to mold a container body, and then the container body is projected outwardly around the opening. A container formed by cutting and leaving the mouth portion of the container body, in which an opening flange extending outward is formed around the opening of the container body, and a skirt portion extending downward is integrally formed on the outer peripheral edge of the opening flange. A container made of a styrene-based resin foam sheet, which is formed and cut at a lower end surface of the skirt in a direction parallel to a bottom surface of a container body to form a mouth portion.
As described above, the mouth of the container is formed by the opening flange projecting to the outer periphery of the opening of the container main body and the skirt portion extending downward from the outer peripheral edge of the opening flange, and the lower end cut surface of the skirt portion is the container. Since it is parallel to the bottom surface, the chance of the lips, fingers, etc. touching the sharp edges of the cut surface is significantly reduced, and the risk of human injury is greatly reduced. Further, when a container is formed by using a laminated styrene resin foam sheet so that the thermoplastic resin film becomes the outer surface, the cut end of the hard resin film is located at the inner edge of the skirt portion. Opportunities for the lips to come into contact with the cut ends of the resin film are even smaller. In addition, when a seal lid is attached to the upper surface of the mouth portion which is the seal surface of the container, the cut surface is located at a lower position from the seal surface. It will no longer stand up.

It is a more preferable embodiment that the edge of the cut surface of the skirt portion is heat-treated so as to be rounded. By thus rounding the edges of the cut surface, it is possible to prevent laceration of the lips and the like even when soft skin, especially the lips, comes into strong contact with the cut surface. Here, it is preferable in terms of safety to give roundness to both the inner peripheral side and outer peripheral side edges of the cut surface, but if the skin and lips do not touch the inner peripheral side edge, the outer peripheral side edge Only the chisel may be rounded. In addition, the present invention provides good results even when the drawing ratio represented by the container height / opening diameter is 0.8 or more.

Further, after heating the styrene resin foam sheet, a feeding container body is formed between the male and female molds, and at the same time, an opening flange extending outwardly around the opening of the container body and the opening flange. A skirt portion extending downward is integrally formed on the outer peripheral edge of the container, and the skirt portion is cut in a direction parallel to the bottom surface of the container body to separate it from the foam sheet, and the opening is formed around the opening of the container body. Provided is a method for manufacturing a container made of a styrene-based resin foam sheet, which is obtained by integrally molding a mouth portion including a collar and a skirt portion.

In this manufacturing method, the foamed styrene resin sheet is heat-molded to integrally mold the container main body, the opening flange and the skirt portion, and the foamed sheet around the skirt portion is left to form the foamed sheet. It is a more preferable embodiment that the skirt portion is cut in a direction orthogonal to the bottom surface of the container body to be separated, and then the skirt portion is cut in a direction parallel to the bottom surface of the container body. Like this
By cutting the foamed sheet around the skirt in the direction orthogonal to the bottom surface of the container body, the conventional molding method of pressing and punching with a metal blade or fusing with a nichrome wire etc. can be used as it is to form the container molded portion and the foamed sheet portion. Can be easily separated, and in the case of multi-cavity molding, it is possible to simultaneously separate multiple container molding parts. Next, in order to remove the excess foamed sheet from the separated individual molded parts of the container, the predetermined position of the skirt is cut in a direction parallel to the bottom surface of the container body.

Further, after cutting the skirt portion in a direction parallel to the bottom surface of the container body, the edge of the cut surface is subjected to heat treatment to impart roundness, so that it is possible to form a desired roundness. Moreover, since the resin in the roundness forming portion is melted and solidified, it is possible to prevent the surface cells from being bagged from the end of the cut surface. In addition, if necessary, the entire peripheral surface of the cut surface may be melted by heat treatment to form a resin film, and fine irregularities on the cut surface may be smoothed to further improve the mouth feel.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The container made of a styrene resin foam sheet according to the present invention means that a styrene resin foam sheet is heat-molded to mold a container body, and then outwardly around the opening of the container body. It is a container formed by cutting and leaving the protruding mouth portion. Further, after using a laminated styrene resin foam sheet obtained by laminating a styrene resin foam sheet and a non-foamed thermoplastic resin film, the resin film is heat-molded so that the outer surface is formed to mold the container body, The same applies to a container formed by cutting while leaving the mouth portion protruding outward around the opening of the container body.

The styrene-based resin foamed sheet means polystyrene, a copolymer resin of polystyrene and styrene with maleic anhydride, methacrylic acid, etc., and a mixed resin of these resins,
Further, the polystyrene resin and the mixed resin such as polyphenylene oxide are kneaded with a foaming agent such as butane and freon in an extruder and then extruded and foamed to form a sheet. Further, the laminated styrene resin foam sheet, in the above-mentioned styrene resin foam sheet, polystyrene, polystyrene resin such as high-impact styrene resin, polyethylene, resin film such as olefin resin such as polypropylene, or polyvinylidene chloride, Ethylene-vinyl alcohol copolymer resin, polyester,
It is formed by laminating a thermoplastic resin film such as a gas barrier resin such as polyamide. Here, a styrene resin foam sheet is laminated with a thermoplastic resin film.
Examples of the composite method include a method in which a film resin is dripped and laminated on a styrene resin foam sheet, a method in which a resin film is directly laminated by heat, a method in which a resin film is laminated via an adhesive, and the like.

A method of manufacturing the container 10 from the styrene resin foam sheet will be briefly described with reference to FIGS. 1 and 2. First, the styrene-based resin foam sheet 1 wound in a roll is sufficiently heated in a heating furnace 2 to be secondarily foamed, and then the styrene-based resin foam sheet 1 is usually sandwiched by a male and female mold 3 arranged in a vertical direction to form a container body 11. An opening flange 13 that extends outwardly around the opening 12 of the container body 11 and a skirt portion 14 that extends downward at the outer peripheral edge of the opening flange 13 are integrally formed. Here, at the lower end of the skirt portion 14, the surplus foamed sheet 15 which has not contributed to the molding of the container portion such as the container body 11 is continuous, and when a plurality of container portions are formed by molding, each skirt is formed. The parts 14, ... Are integrally continuous with the surplus foam sheet 15. At the time of this molding, the inside of the male and female mold 3 is decompressed by the vacuum evacuation means 4 to enhance the transferability of the mold shape.

After molding the container body 11, the opening flange 13 and the skirt portion 14, a surplus foam sheet 15 is left around the skirt portion 14, and the surplus foam sheet 15 is attached to the bottom surface 16 of the container body 11. Automatic punching machine 5 equipped with punching blades such as punching blades or Thomson blades from the orthogonal direction
Punch out with. The shape of the blade of the automatic punching machine 5 is not particularly limited, but a round blade is preferable in terms of maintainability and gradually increasing contact pressure.

Then, as shown in FIGS. 2 and 3, the appropriate portion of the skirt portion 14 is cut by a rotary cutting blade 17 arranged in a direction parallel to the bottom surface 16 of the container body 11 to remove the surplus foamed sheet 15. Separate into individual containers 10 shown in FIGS. 4 and 5. In this case, the opening flange 13 and the skirt portion 14 form the mouth portion 18 of the container 10. still,
Reference numeral 19 in the drawing denotes a lower end surface of the skirt portion 14, that is, a cut surface. When the surplus foamed sheet 15 is cut and separated, the container body 11 with the surplus foamed sheet 15 attached thereto is supported so as not to interfere with internal or external cutting. In the structure shown in FIG. 2, a support body 20 having substantially the same shape is fitted and supported inside the container body 11 with the opening 12 of the container body 11 facing downward, and the support body 20 is provided at the center of the lower end of the support body 20. The fixed rotary shaft 21 is rotated, the container body 11 is rotated with respect to the rotary cutting blade 17, and the entire circumference of the skirt portion 14 is cut.
Alternatively, it is also possible to similarly fit and support the container body 11 by the support body 20 and fix it in a non-rotating state, and move the rotary cutting blade 17 along the outer periphery of the skirt portion 14 to obtain a flat surface of the container 10. If the visual shape is close to a square, the rotary cutting blade 17
Is easy to control. It is also possible to cut with a hot wire such as a nichrome wire or a hot plate instead of the rotary cutting blade 17 described above.

Here, the cut portion of the skirt portion 14 is not particularly limited, but in order to accurately reflect the intention of the present invention, immediately after bending of the skirt portion 14 extending downward on the outer peripheral edge of the opening collar 13. It is preferable to cut below the opening flange 13 of the above.

As described above, after the surplus foamed sheet 15 is left around the skirt portion 14 and cut in the direction orthogonal to the bottom surface 16 of the container body 11 to separate the skirt portion 14, the proper position of the skirt portion 14 is placed on the bottom surface 16. On the other hand, the method of cutting in the parallel direction is effective when the cutting means such as the rotary cutting blade 17 cannot be inserted between the adjacent skirt portions 14 in the case of forming a large number of pieces in one shot. However, when molding only one piece per shot, the surplus foam sheet 1
It is not necessary to cut 5 and the skirt portion 14 may be cut while the surplus foam sheet 15 is still attached.

The container 10 of the present invention can be molded in the same manner as above using a laminated styrene resin foam sheet obtained by laminating a non-foamed thermoplastic resin film on a styrene resin foam sheet. In that case, the thermoplastic resin film is formed so as to be the outer surface of the container. In this case, the cut edge of the hard thermoplastic resin film is located on the inner peripheral side of the cut surface 19, and there is very little chance of contact with skin such as lips, and the outer peripheral side of the cut surface 19 is relatively soft styrene. Since it is a foamed resin sheet, the probability of tearing is very low even when the skin such as lips comes into contact.

As described above, the skirt portion 14 is attached to the mouth portion 18.
By forming the cut surface 19, the sharp edge 22 of the cut surface 19 is less likely to be directly touched by the skin such as the lips, and the risk of laceration of the lip or the like can be reduced.
No. 2 is still sharp, and when the mouth is intentionally widened to cover the entire skirt portion 14 and the lips are strongly rubbed against the edge 22, or when a finger is strongly applied to the edge 22 to wipe the mouth portion 18, etc. The possibility of skin injury cannot be ruled out.

Therefore, in the present invention, the edge 22 of the cut surface 19 is further heat-treated to impart roundness to enhance safety. To do this, as shown in FIGS.
First, with the opening 12 of the container 10 facing downward, the container main body 11 is externally fitted to the fitting convex portion 24 of the support 23 of substantially the same shape, and the opening flange 13 of the base 18 is fitted to the flange of the support 23. The container 10 is placed on the portion 25 to prevent the container 10 from swinging and to secure the pressing force. In this case, the bottom surface 16 of the container 10
Is pressed by the pressing jig 26 in the direction of insertion into the fitting convex portion 24 of the support body 23 to be fixed. The pressing jig 26 is preferably a vacuum chuck so that the pressing jig 26 is attached to the bottom surface 16 when the container 10 is removed from the support 23. It is practical to use the same support body 20 as the support body 23 having the flange portion 25.

Next, the annular concave surface 28 of the heating jig 27 having a temperature higher than the glass transition temperature of the container resin is pressed against the entire circumference of the cut surface 19 oriented upward, and at least the edge 22 of the cut surface 19 is pressed. The part is melted by heat and rounded into a so-called rounded shape or C-chamfered shape (see FIG. 9, 29 in the figure indicates roundness). The heating jig 27 has a mouth portion 1
The shape is not particularly limited as long as the edge 22 can be rounded when the cut surface 19 of FIG. 8 is heated. However, as shown in FIG. 7, a bowl-shaped annular concave surface having rounded ends in a sectional shape is used. 8 has a structure in which the entire surface including the edge 22 of the cut surface 19 can be heated as shown in FIG.
As shown in FIG.
Right-angled triangular annular concave surface 28 having a slope of 5 degrees
It is preferable that the structure having the above has a shape capable of heating only the edge 22.

In the rounding of the inner and outer edges 22 and 22 of the cut surface 19, it is preferable to machine both edges as shown in FIG. 9 (a) in terms of safety, but the inner edge 22 is rounded.
If the skin does not come into contact with the skin, it is easy to use Fig. 9 (b).
As described above, only the edge 22 located on the outer peripheral side may be rounded.

When heating the cut surface 19,
As described above, in addition to pressing the annular heating jig 27 that comes into contact with the entire periphery of the edge 22 of the cut surface 19 at once, the heating treatment is performed by pressing the heating jig 27 against the edge 22 or the container 10 or the heating treatment. Although it is possible to rotate the tool 27 for heat treatment, the former is simpler in terms of process. Further, in heating, it is preferable to use the above-mentioned pressing jig 26 in order to secure a reliable contact pressure and prevent uneven heating.

The container 10 according to the present invention accommodates food such as instant noodles inside the container body 11 and has a seal lid (not shown) on the upper surface (sealing surface) of the opening collar 13 of the mouth portion 18 with an adhesive. It is used as a packaging container by pasting it by heat welding or the like. When eating the food inside, the container 10 is flipped over to use the container 10 as a tableware, and the lips are applied to the mouth portion 18 to sip the juice as needed. In the present invention, the skirt portion 14 extending downward is formed on the outer peripheral edge of the opening collar 13 of the mouth portion 18, and the seal lid is the opening collar 1.
Since it is attached only to No. 3, the surface cell of the styrene resin foam sheet does not peel off from the cut surface 19 when the above-mentioned seal lid is turned over, and the lip does not come into contact with the upper surface of the opening collar 13 in normal use. Since it hits the outer peripheral surface of the skirt portion 14, it has a good mouth feel, and there is very little risk that the lips or the like will be torn at the edge 22 of the cut surface 19, and the edge 22 will be completely eliminated by rounding.

[0026]

【Example】

(Example 1) First, as shown in FIG. 4, in a container having a basic wall thickness of 2 mm after molding, a height of 100 mm, a mouth diameter of about 100 mm, a bottom diameter of about 60 mm and a drawing ratio of about 1, a container mouth portion 18 has a vertical width. Form a bent skirt 14 of 3 mm,
An attempt was made to cut in a direction parallel to the bottom surface 16 (horizontal direction). In molding, the container 10 was formed into a plurality of 9 pieces, and before cutting and extracting in the horizontal direction, the container 10 was punched into an approximately square having a side length of about 120 mm by using the automatic punching machine 5.

A support body 20 having a rotary shaft 21 centered on the central axis of the container is inserted into the inside of the molded product in which the container body 11, the mouth portion 18 and the surplus foam sheet 15 around the container are integrated, and rotation is applied. It was The rotation speed was set to 120 rpm. In this supporting state, the upper surface of the container, that is, the opening collar 13
At the skirt portion 14 located at a position of 5 mm from the upper surface, the rotary cutting blade 17 is pressed from the direction orthogonal to the rotary shaft 21 to start cutting. The final insertion amount of the blade is 2.5 mm so as not to damage the container other than the desired cutting portion, and about 1.
Control was performed so that the surplus foam sheet 15 was cut off after 5 rotations. The container 10 manufactured in this way is shown in FIG.

As a result, the lips were damaged with a probability of 1/2000 when the lips were rubbed against the mouth of the conventional container cut off at a right angle with respect to the bottom surface 16 without the skirt portion. With the container according to the invention, the probability is 1/200000
The risk was significantly reduced by decreasing to below.

(Example 2) An attempt was made to heat-treat the cut surface 19 of the skirt portion 14 of the container 10 obtained in Example 1. The heating jig 27 for rounding the edge 22 of the cut surface 19 has an annular shape and has a wedge-shaped annular concave surface 2 shown in FIG.
8 has a structure in which the cut surface 19 is brought into contact with the annular concave surface 28 for processing. The angle of both slopes of the annular concave surface 28 was 45 degrees, and the distance from the vicinity of the edge 22 of the cut surface 19 pressed against the edge 22 of the cut surface 19 was set to about 2 mm and the total depth was set to 3 mm so as to reliably receive the thickness of 2 mm. .

The temperature of the heating jig 27 is 150.degree.
The contact heating time was 0.5 seconds. In addition, a support body 23 as shown in FIG.
In the state of 6 being pressed and supported by the pressing jig 26, the annular concave surface 28 of the heating jig 27 was pressed against the cut surface 19 of the container 10 for heat treatment. The pressure applied at this time was 3 kgf. As a result of this heat treatment, a slightly rounded chamfered surface having an approximate dimension C0.5 as shown in FIG. 9A was formed at the edge 22 of the cut surface 19 which was substantially right before the treatment.

As a result, before the heat treatment, it is 1/200000.
There was a probability that the skin was damaged, but it disappeared after the heat treatment. Further, although there was a feeling of a knife even if it was not damaged when the edge 22 was touched, it was not felt at all after the heat treatment, and the psychological sense of security was improved.

[0032]

EFFECTS OF THE INVENTION According to the present invention having the above-mentioned contents, an opening flange is formed which extends outward from the mouth of a container made of a styrene resin foam sheet around the opening of the container body and the opening is formed. A skirt portion that extends downward is integrally formed on the outer peripheral edge of the collar, and the lower end surface of the skirt portion is formed by cutting in a direction parallel to the bottom surface of the container body. The chance of the edge of the cut surface coming into contact with the lips and the like was significantly reduced, the risk of human injury was significantly reduced and the mouthfeel was improved. When used as a packaging container, a seal lid is attached to the top of the mouth of the container to close the opening,
When the seal lid attached to the upper surface of the mouth is turned over, the surface cells of the styrene resin foam sheet layer are not attached to the seal lid and peeled off at all.

Further, the edge of the cut surface of the skirt is heat-treated so as to be rounded, so that there is no possibility of laceration of the lip even if the lip touches the cut surface. I was able to.

[Brief description of the drawings]

FIG. 1 is a simplified layout view showing a part of a container manufacturing apparatus according to the present invention.

FIG. 2 is a simplified perspective view showing a step of cutting a surplus foam sheet remaining on the outer periphery of the skirt portion in a direction parallel to the bottom surface.

FIG. 3 is an enlarged sectional view of a main part of the same.

FIG. 4 shows a container manufactured according to the present invention, in which (a) is a partially cutaway side view and (b) is a plan view.

FIG. 5 is an enlarged cross-sectional view of the mouth portion of the same.

FIG. 6 is a simplified cross-sectional view showing a step of heat-treating a cut surface of a skirt portion.

FIG. 7 is an enlarged cross-sectional view of an essential part showing a state in which a cut surface is heat-treated with a heating jig having a bowl-shaped annular concave surface.

FIG. 8 is an enlarged cross-sectional view of an essential part showing a state in which a cut surface is heat-treated with a heating jig having a right-angled triangular annular concave surface.

FIG. 9 shows the mouth part after heat treatment of the cut surface, (a)
FIG. 3B is an enlarged cross-sectional view of a mouth portion in which the inner and outer edges of the cut surface are rounded, and FIG. 7B is an enlarged cross-sectional view of a mouth portion in which only the outer edge of the cut surface is rounded.

[Explanation of symbols]

 1 Styrene Resin Foamed Sheet 2 Heating Furnace 3 Mold 4 Vacuum Evacuation Means 5 Automatic Punching Machine 10 Container 11 Container Body 12 Opening 13 Opening Collar 14 Skirt 15 Excessive Foaming Sheet 16 Bottom 17 Rotating Cutting Blade 18 Portion 19 Cutting Surface 20 Support 21 Rotating Shaft 22 Edge 23 Support 24 Fitting Convex Part 25 Flange Part 26 Pressing Jig 27 Heating Jig 28 Annular Concave 29 Roundness

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location B29L 31:00

Claims (7)

[Claims] 1. A container formed by thermoforming a styrenic resin foam sheet to mold a container body, and then cutting the container body, leaving a mouth portion projecting outward around the opening of the container body. An opening flange extending outward is formed around the opening of the container body, and a skirt portion extending downward is integrally formed on the outer peripheral edge of the opening flange, and the lower end surface of the skirt is formed on the bottom surface of the container body. On the other hand, a container made of a styrenic resin foam sheet, which is formed by cutting in a parallel direction to form a mouth portion. 2. A container made of a styrene-based resin foam sheet according to claim 1, wherein an edge of a cut surface of the skirt portion is heat-treated to be rounded. 3. The styrene-based resin foam sheet container according to claim 1 or 2, wherein the drawing ratio represented by the container height / opening diameter is 0.8 or more. 4. A styrene-based resin foam sheet is heated, and then a feeding container body is formed between male and female dies, and at the same time, an opening flange extending outwardly around the opening of the container body and the opening flange. A skirt portion extending downward is integrally formed on the outer peripheral edge of the container, and the skirt portion is cut in a direction parallel to the bottom surface of the container body to separate it from the foam sheet, and the opening is formed around the opening of the container body. A method for manufacturing a container made of a styrene-based resin foam sheet, characterized in that a mouth portion composed of a collar and a skirt portion is integrally molded. 5. The foamed styrene resin sheet is heat-molded to integrally mold the container body, the opening flange and the skirt portion, and the foamed sheet around the skirt portion is left, and the foamed sheet is placed on the bottom surface of the container body. 5. The method for producing a styrene-based resin foam sheet container according to claim 4, wherein the skirt portion is cut in a direction orthogonal to the container and separated, and then the skirt is cut in a direction parallel to the bottom surface of the container body. 6. The method for producing a container made of a styrene resin foam sheet according to claim 4, wherein the edge of the cut surface of the skirt is heat-treated to impart roundness. 7. The method for producing a styrene resin foam sheet container according to claim 4, wherein the drawing ratio represented by the container height / diameter of the opening is 0.8 or more.