JP3021697U - Laminated sheets for thermoforming and instant food containers - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To improve the poor elongation at the time of molding of a polystyrene-based resin foam sheet for molding, an annealing treatment is applied to the sheet. The improved conventional polystyrene-based resin foamed sheet has problems that the appearance is deteriorated and the secondary foaming ability required for molding is decreased in a short time. Further, the container obtained from the conventional polystyrene-based resin foam sheet has low slipperiness, and the low slipperiness causes various troubles. The present invention has a density of 0.075 to 0.15.
g / cm ^3, the extruded polystyrene resin foam sheet 2 having a thickness of 1.0 to 2.5 mm, thickness 0.05~0.2mm
In the laminated sheet 1 having a unit weight of 350 to 450 g / m ² , which comprises the polystyrene-based resin non-foamed sheet 3 of
Laminated sheet 1 in which the average glossiness of the foamed sheet 2 side surface 20 of at least the thermoformed portion of the laminate sheet is 7.5% or less, and the difference between the maximum glossiness and the minimum glossiness is within 3.0%. Is.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a laminated sheet for thermoforming and a container for instant food formed by molding the sheet.

[0002]

[Prior art]

 A polystyrene resin foam sheet obtained by melt-kneading a polystyrene resin with a foaming agent in an extruder and then extruding and foaming from the extruder is a thermoforming sheet for thermoforming to obtain a molded product such as a food container. Is widely used as. By the way, the polystyrene-based resin foam sheet may cause molding defects such as cracks in the obtained molded product due to poor elongation during thermoforming.

In order to improve the moldability of such a polystyrene-based resin foamed sheet, a method has been proposed in which the surface of the foamed sheet is subjected to a heat treatment (such heat treatment may be referred to as annealing). In Japanese Patent Publication No. 5-3820, for example, an extruded foamed sheet of polystyrene resin is passed between a heating roll and a pressing roll, and heated by a heating roll at a temperature of 150 to 250 ° C. for a single hour. A method has been proposed which can improve the formability of the foamed sheet and can improve the appearance by making the surface of the foamed sheet whiter. In this method, the foamed sheet is instantaneously brought into line contact with the surface of the heating roll to heat the foamed sheet in a short time.

[0004]

[Problems to be solved by the device]

 However, in the method described in Japanese Patent Publication No. 5-3820, the polystyrene resin foam sheet is brought into contact with a heating roll having a high temperature of 150 ° C. or higher, so that the rupture (defoaming) of bubbles on the surface of the obtained sheet is prevented. It may occur, or the surface may become keloid-like (the roughness of the sheet surface is generically referred to as “burning” below), and as a result, the appearance of the foamed sheet may be deteriorated or necessary for thermoforming. However, there was a problem that the secondary foaming power was reduced in a short period of time. Even a foamed sheet with such “burning” can be subjected to thermoforming for a while while the secondary foaming force is maintained to some extent. However, when molding a foamed sheet that causes “burn”, there is a problem that “burning” becomes more severe unless the heating temperature range is set to an extremely narrow range when heating the foamed sheet prior to thermoforming. there were. It was also very difficult to control and heat within such an extremely narrow temperature range.

Further, although the polystyrene-based resin foamed sheet generally has unevenness in thickness and the like, a method of instantaneously contacting and heating with a heating roll as described in Japanese Patent Publication No. 5-3820. In the case of a foamed sheet with uneven thickness, it is difficult to evenly contact the heating roll with the sheet surface, so the entire surface of the sheet is unevenly heated, and as a result, the appearance and thermoformability of the foamed sheet are not uniform. It didn't happen. If the heating roll and the nip pressure roll increase the nip pressure of the sheet so that the heating roll contacts the surface of the foamed sheet evenly, wrinkles occur on the surface of the foamed sheet and the appearance is deteriorated, or bubbles burst. As a result, the secondary foaming force required for thermoforming is reduced in a short period of time.

Further, a conventional container molded from a polystyrene-based resin foamed sheet is a container formed from a laminated sheet in which a non-foamed sheet of styrene-based resin or the like is laminated on one surface. Due to the poor property, when taking out one by one from the stacked state, there is a problem that two or more containers are taken out in an overlapping manner, which may hinder the work of storing the products in the container. there were.

As a result of earnest studies to solve the above problems, the inventors of the present invention have found that in a thermoforming laminated sheet in which a polystyrene resin non-foamed sheet is laminated on a polystyrene resin extruded foam sheet, the average surface of the foam sheet side is We have found that a laminated sheet having a glossiness of 7.5% or less and a difference between the maximum glossiness and the minimum glossiness of 3.0% or less can solve the above problems, and completed the present invention.

[0008]

[Means for Solving the Problems]

That is, the laminated sheet for thermoforming of the present invention comprises a polystyrene resin extruded foam sheet having a density of 0.075 to 0.15 g / cm ³ and a thickness of 1.0 to 2.5 mm, and a thickness of 0. In a laminated sheet having a unit weight of 350 to 450 g / m ² comprising a polystyrene resin non-foamed sheet of 05 to 0.2 mm, the average glossiness of the laminated sheet on the foamed sheet side is 7.5% or less, and the maximum. The difference between the glossiness and the minimum glossiness is within 3.0%. The instant food container of the present invention is a container formed by thermoforming the thermoforming laminated sheet.

[0009]

[Embodiment of device]

Hereinafter, the present invention will be described with reference to the drawings. As shown in FIG. 1, a laminated sheet 1 of the present invention has a structure in which a polystyrene resin non-foamed sheet 3 is laminated on a polystyrene resin extruded foam sheet 2. The density of the foamed sheet 2 in the laminated sheet 1 of the present invention is 0.075 to 0.15 g / cm ³ , the thickness is 1.0 to 2.5 mm, and the thickness of the non-foamed sheet 3 is 0.05 to 0. It is 2 mm. The laminated sheet 1 of the present invention has a unit weight of 350 to 450 g / m ² .

In the laminated sheet 1 of the present invention, as the polystyrene resin which is the base resin of the foamed sheet 2, styrene homopolymer, p-methylstyrene homopolymer, styrene-maleic anhydride copolymer, styrene-acrylonitrile. Examples thereof include copolymers, styrene-acrylic acid copolymers, styrene-methacrylic acid copolymers, high-impact polystyrene, styrene-butadiene-acrylonitrile copolymers, and mixtures of polystyrene and polyphenylene oxide. The MFR of the polystyrene resin is not particularly limited, but is preferably about 0.1 to 60 g / 10 minutes. Examples of the polystyrene-based resin which is the base resin of the non-foamed sheet 3 include the same resins as those exemplified as the base resin of the foamed sheet 2.

The polystyrene-based resin foamed sheet 2 used in the present invention is an extruded foamed sheet obtained by melt-kneading a polystyrene-based resin and a foaming agent in an extruder and then extruding and extruding from the extruder. As the foaming agent used for foaming, a volatile foaming agent, an inorganic gas type foaming agent, a decomposable foaming agent or the like is used.

Examples of the volatile blowing agent include aliphatic hydrocarbons such as propane, butane, pentane and hexane, cycloaliphatic hydrocarbons such as cyclobutane and cyclopentane, trichlorofluoromethane, dichlorodifluoromethane, 1, 2-dichloro-1,1,2,2-tetrafluoroethane, 1-chloro-1,1-difluoroethane, 1,1-difluoroethane, 1,1-dichloro-2,2,2-trifluoroethane, methyl chloride, Examples thereof include halogenated hydrocarbons such as ethyl chloride and methylene chloride. Examples of the inorganic gas-based foaming agent include carbon dioxide, nitrogen, and inert gases such as air. Examples of the decomposition type foaming agent include azodicarbonamide, dinitrosopentamethylenetetramine, azobisisobutylnitrile, sodium bicarbonate and the like. These foaming agents may be used as a mixture of two or more kinds.

The laminated sheet 1 of the present invention is characterized in that the average glossiness of the surface 20 on the foam sheet 2 side is 7.5% or less, and the difference between the maximum glossiness and the minimum glossiness is within 3.0%. And The average glossiness, the maximum glossiness, and the minimum glossiness are, as shown in FIG. 7, along the direction orthogonal to the extrusion direction (arrow direction in FIG. 7) of the foam sheet 2 side surface 20 of the laminated sheet 1. Using a gloss meter, a total of 10 gloss points at points a and b, which are located 3 cm inside from both edges of the sheet 1, and points c to j, which are obtained by equally dividing the points a and b into eight, are measured by a gloss meter. The average value, the maximum value and the minimum value of the values when measured under the condition of an irradiation angle of 60 ° from the longitudinal direction (direction parallel to the extrusion direction). If either the average glossiness of the surface 20 of the foamed sheet 2 or the difference between the maximum glossiness and the minimum glossiness is out of the above range, “fog” occurs on the surface 20 of the foamed sheet 2 and The container for instant foods obtained by molding is prone to "naki", and the slipperiness of the container also deteriorates.

The glossiness of the foamed sheet 2 is a measure showing the degree of annealing of the foamed sheet 2. The average glossiness of the surface 20 on the foamed sheet 2 side is 7.5% or less, and the maximum glossiness and the minimum glossiness. The laminated sheet 1 of the present invention having a difference in degree of less than 3.0% has the surface of the polystyrene-based resin extruded foam sheet 2 placed on a heating roll whose surface temperature is less than 150 ° C. After contacting for 4 seconds or more and heating, the non-foamed sheet 3 is laminated on the non-heat-treated surface of the foamed sheet 2, or after the foamed sheet 2 and the non-foamed sheet 3 are laminated, the surface temperature of the foamed sheet 2 side is 150. It is obtained by contacting with a heating roll having a temperature of less than 0 ° C. for 0.4 seconds or more and heating. The case of obtaining the laminated sheet 1 of the present invention by the former method will be described below.

The foamed sheet 2 extruded from the extruder and foamed is usually wound in a roll and then treated in a step different from the foaming step by contacting with a heating roll while unfolding from a roll body. Alternatively, the sheet extruded and foamed from the extruder may be brought into contact with a heating roll before being wound into a roll (online treatment).

In order to heat the foamed sheet 2, for example, as shown in FIG. 2, a method of winding the foamed sheet 2 around the surface of the heating roll 4 and bringing the sheet 2 into surface contact with the heating roll 4 and heating is performed. Adopted. Although the surface temperature of the heating roll 4 is lower than 150 ° C., the foamed sheet 2 is in surface contact with the heating roll 4, so that the heating roll 4 is prevented from being fused to the heating roll 4. 4 is preferably one whose surface is coated with polytetrafluoroethylene resin.

The contact time between the foam sheet 2 and the heating roll 4 is adjusted by changing the rotation speed of the heating roll 4 and the contact length between the foam sheet 2 and the heating roll 4. The contact length between the foamed sheet 2 and the heating roll 4 is adjusted by adjusting the line segment connecting the point A where the foamed sheet 2 starts contacting the heating roll 4 and the center of the heating roll 4 and the foamed sheet 2 with the heating roll 4. This is performed by adjusting the angle θ formed by the line segment connecting the point B away from the center of the heating roll 4 and the line segment connecting the center of the heating roll 4. The set value of the holding angle varies depending on the diameter of the heating roll 4 and the rotation speed of the heating roll 4. Generally, when the rotation speed of the heating roll 4 (peripheral speed of the roll surface) is set to about 3 to 40 m / min, a heating roll having a diameter of 200 mm has a wrap angle: θ of 20 to 180 ° and a heating of a diameter of 300 mm. For the roll, the included angle: θ is 15 to 150 °, and for the heated roll having a diameter of 400 mm, the included angle: θ is about 10 to 130 °.

The wrapping angle: θ is adjusted by, for example, providing two tension rolls 5a and 5b with the heating roll 4 interposed therebetween and moving the tension rolls 5a and 5b up and down. In the case shown in FIG. 2, when the tension rolls 5a and 5b are moved upward, the wrap angle: θ between the foam sheet 2 and the heating roll 4 becomes small, and as a result, the foam sheet 1 and the heating roll 2 are separated from each other. The contact length is reduced. On the contrary, when the tension rolls 5a, 5b are moved downward, the included angle θ between the foam sheet 2 and the heating roll 4 becomes large, and as a result, the contact length between the foam sheet 2 and the heating roll 4 increases. .

As for the contact time between the foamed sheet 2 and the heating roll 4, not only adjustment of the wrapping angle: θ but also two or more heating rolls 4a and 4b are provided as shown in FIG. It can also be adjusted by bringing the foamed sheet 2 into contact with the surface of 4b sequentially. In FIG. 3, 5a, 5b and 5c are tension rolls, and 6a and 6b are pinching rolls.

It is more effective if the foamed sheet 3 is heated by the heating roll 4 and the method of applying pressure between the pressing roll 6 and the heating roll 4 is used together. When the foamed sheet is pressed between the pressing roll 6 and the heating roll 4, the pressing roll 6 is pressed during the heating process of the foamed sheet 2 by the heating roll 4 (especially, 0.1 seconds or more after the start of heating). It is preferable to provide the pinching roll 6 so that the sheet comes into contact with and presses against the foamed sheet 2. When the step of pressurizing the foamed sheet 2 with the pressing roll 6 and the heating roll 4 is provided, as shown in FIG. 4, the foaming sheet 2 is contacted so as to be wound around the heating roll 4 and the pressing roll 6 alternately. The foamed sheet 2 may be heated by the heating roll 4 and then pressed by the pinching roll 6 and the heating roll 4. The pressure (linear pressure) applied to the foamed sheet 2 by the heating roll 4 and the pinching roll 6 is preferably 3.0 to 10 kg / cm. It should be noted that as the pinching roll 6, a roll without a heating mechanism is usually used.

When the foaming sheet 2 is pressed by the pressing rolls 6, the pressing is performed before the foaming sheet 2 is heated to some extent, such as immediately after the foaming sheet 2 is heated (before 0.1 second has elapsed from the start of heating). When the foam sheet 2 is pressed by the pressure roll 6 and the heating roll 4, the bubbles of the foam sheet 2 may burst. As shown in FIG. 2, the sandwiching roll 6 has the foaming sheet 6 at a substantially intermediate point between a point A where the foaming sheet 2 starts to contact the heating roll 4 and a point B where the foaming sheet 2 is separated from the heating roll 4. It is preferable to provide the pressing roll 6 so as to contact the sheet 2 and press the sheet 2 so that uniform tension is applied to the foamed sheet 2 before and after the heating roll 4.

Not only one side of the foamed sheet 2 is heated, but also one side of the foamed sheet 2 is brought into contact with the heating roll 4a as shown in FIG. 5, and then the other side of the foamed sheet 2 is heated to the heating roll 4b. Both sides of the sheet 2 may be heated by bringing them into contact with each other. In FIG. 5, 5a, 5b, 5c and 5d are tension rolls, and 6a and 6b are pinching rolls.

The laminated sheet 1 of the present invention can be obtained by laminating the polystyrene-based resin non-foamed sheet 3 on the foamed sheet 2 which has been heat-treated as described above. In the example shown in FIG. 2, the non-foamed sheet 3 is laminated on the non-heat treated surface of the foamed sheet 2 between the pressure rolls 8a and 8b while extruding the polystyrene resin non-foamed sheet 3 from the extruder 7. 1 shows a method (extrusion laminating method) for obtaining the sheet 1. The foamed sheet 2 and the non-foamed sheet 3 are not limited to the case where they are laminated by the extrusion laminating method as shown in FIG. 2, but a polystyrene resin film produced in a separate step in advance is heat-sealed to the foamed sheet. Alternatively, they may be laminated by a thermal laminating method. When only one surface of the polystyrene-based resin foam sheet 2 is heat-treated as described above, the polystyrene-based resin non-foaming sheet 3 is laminated on the non-heat-treated surface side of the polystyrene-based resin foam sheet 2; When both surfaces of No. 2 are heat-treated and the non-foamed sheet 3 is laminated on the heat-treated surface, especially by the thermal lamination method, the non-foamed sheet 3 can be formed even if a load is applied during thermoforming because the adhesive strength between the two is excellent. There is no risk of easy peeling from the foam sheet 2.

FIG. 6 shows an example of an instant food container obtained by thermoforming the above-described laminated sheet 1 of the present invention. The container 9 shown in FIG. 6 is formed by molding the laminated sheet 1 so that the non-foamed sheet 3 of the laminated sheet 1 is located inside the container 9. The thermoforming method for the formed sheet 1 includes vacuum forming, pressure forming, and applications thereof such as free drawing forming, plug and ridge forming, ridge forming, matched forming, straight forming, drape forming, reverse drawing. Molding, air-slip molding, plug-assist molding, plug-assist reverse road molding, etc., or a combination of these is used.

The instant food container 9 of the present invention obtained by molding the above-mentioned laminated sheet 1 has an excellent appearance with almost no “paki” or the like, and the maximum glossiness of the surface on the side of the foamed sheet 9 is 9. When the content is 0% or less, slippage is good, and when the molded containers and the like are taken out one by one from the stacked state, there will be no trouble such as two or more being taken out in an overlapping manner. Further, like the container 9 shown in FIG. 6, in the container formed by molding the laminated sheet 1 so that the foamed sheet 2 having the maximum glossiness of 9.0% or less is located outside the container 9, A process of transporting a container while repeating movement and stop, and generally stopping the transport of the container while the container is slid on the transport means, as in the automatic filling and packaging method in which the product is sequentially filled into the container during the transport process. In the case of being accompanied, since the bottom of the container slides well, there is little risk that the containers will overlap or fall over even when the transfer is stopped by sliding the containers.

The container 9 for instant food of the present invention is not limited to one formed so that the foam sheet 2 side is the outside as shown in FIG. 6, but the foam sheet 2 is located inside the container. It may be shaped. A plurality of products such as cup noodles are stored, stored, transported and sold in the same cardboard box, but the cardboard box is often thrown during transportation. Since the laminated sheet 1 of the present invention remarkably improves the impact resistance of the foamed sheet 2, the instant food container of the present invention obtained by molding the laminated sheet 1 has excellent impact resistance and has the above-mentioned structure. Even in such cases, there is very little risk of the container being damaged by impact. In particular, in the case where the foamed sheet 2 side is located inside, even when a solid food such as dried noodles collides with the inner wall of the container during transportation, the inner wall of the container is not likely to be damaged. . Therefore, in the case of the instant food container 9 of the present invention, when the slipperiness of the outer surface of the container is particularly important, the foam sheet 2 side is located outside the container 9, and the impact resistance of the container is particularly important. In this case, it is preferable that the foam sheet 2 side is located inside the container 9.

[0027]

【Example】

Hereinafter, the present invention will be described in more detail with reference to examples. Examples 1 and Comparative Examples 1 and ² A roll obtained by rolling an extruded foam sheet (width 1040 mm) having a thickness of 2.3 mm and a basis weight of 250 g / m ^{2 using} polystyrene having a Vicat softening point of 105 ° C. as a base resin. While sequentially feeding the foamed sheet out of the roll body, the foamed sheet is brought into contact with the heating roll (diameter 200 mm) according to the method shown in FIG. 2, and the foamed sheet comes into contact with the heating roll at a substantially intermediate point. In, the foamed sheet was pressed by a pressing roll (without a temperature adjusting mechanism). The distance between the heating roll and the pinching roll was 1.3 mm when the foamed sheet was not passing, and was 1.8 mm when the foamed sheet was passing. The thickness of the foamed sheet after heating and pressing is 2. It was 3 to 2.4 mm.

Next, an impact-resistant polystyrene (HIPS) film (film basis weight 140 g / m ² ) was laminated on the surface of the foamed sheet that was not subjected to the heat treatment by an extrusion laminating method, and then rolled again. Rolled up. Surface temperature of the heating roll, rotation speed of the peripheral surface of the heating roll, contact length between the foamed sheet and the heating roll, contact time and angle of wrapping, pressure between the pressure roller and the heating roll (line pressure ) Is shown in Table 1. The glossiness of the heat-treated surface of the laminated sheet was measured with a perfect digital portable gloss meter "PG-3D" manufactured by Nippon Denshoku Industries Co., Ltd. at an irradiation angle of 60 ° from the longitudinal direction of the sheet at 10 points. . Table 1 shows the average glossiness, the maximum glossiness, the minimum glossiness, and the difference between the maximum glossiness and the minimum glossiness. The average glossiness of the foamed sheet that was not heat-treated was 13.0%. In addition, Table 1 also shows the occurrence of "burn" on the surface of the laminated sheet on the side of the foamed sheet.

The laminated sheets are sequentially unrolled from the roll body obtained by winding the laminated sheet obtained as described above, and continuous thermoforming of the container is performed so that the HIPS laminated surface side of the laminated sheet is located on the inner surface side of the container. went. At this time, the number of containers taken per shot was 5 in the length direction of the laminated sheet and 5 in the width direction. The container obtained by molding is a rectangular container in which the length of one side of the opening is about 16 cm (about 17.5 cm including the lip portion) and the length of one side of the bottom is about 13 cm. Table 1 also shows the occurrence of “Naki” on the upper side wall of the container. The state of occurrence of "Naki" was observed by observing 25 containers and indicated by the number of containers in which "Naki" was recognized. When molding a similar polystyrene foam sheet that was not heat treated, "Naki" was found in 12 out of 25 containers.

[0030]

[Table 1]

Example 2 The diameter of the heating roll was changed to 400 mm, the same extruded foam sheet as used in Example 1 was treated under the conditions shown in Table 1, and then was not heat-treated in the same manner as in Example 1. After the HIPS film was laminated on the side surface, it was wound again into a roll shape. The glossiness of the surface of the laminated sheet on the side of the foamed sheet was measured in the same manner as in Example 1, and the occurrence status of “burn” on the surface of the foamed sheet is also shown in Table 1. In addition, a container similar to that of Example 1 was molded from this laminated sheet, and the state of occurrence of "paki" in the obtained container is shown in Table 1. As a result, it was found that, if the temperature of the heating roll and the contact time of the foamed sheet with the heating roll are the same, substantially the same result is obtained even if the heating roll diameter is different.

[0032]

[Effect of device]

 As explained above, the laminated sheet for thermoforming of the present invention has an average gloss of 7.5% or less on the polystyrene resin foam sheet side surface and a difference between the maximum gloss and the minimum gloss of 3.0. When the content is within the%, the foamed sheet side surface does not have “burning” and is excellent in moldability. Therefore, the container obtained by thermoforming the laminated sheet of the present invention may have defects such as “paki”. Less is. In addition, the instant food container of the present invention has good slipperiness on the surface of the foamed sheet side, and even if the containers are stacked and stored and then taken out one by one in use, two or more can be taken out in an overlapping manner. There is no fear of causing problems. In particular, when the foam sheet side is configured to be the outer surface side of the container, automatic filling and packaging including at least the step of stopping the movement of the container while sliding the containers between and / or on the transfer device. Even if the container is applied to the container, the bottom of the container is slippery, so when stopping the container movement while sliding the container, the container may fall over or the containers may overlap with each other. Is prevented from occurring.

Further, since the instant food container of the present invention has excellent impact resistance, even if the container is subjected to an impact during transportation, the risk of the container being damaged by the impact is extremely low. In particular, in the container configured such that the foam sheet side is the inner surface side, even if the solid product or the like in the container collides with the inner wall of the container during transportation, there is no fear of damaging the inner wall of the container.

[Brief description of drawings]

1 is a longitudinal sectional view of a laminated sheet of the present invention.

FIG. 2 is a process schematic view showing an example of manufacturing the laminated sheet of the present invention.

FIG. 3 shows an example of heating using a plurality of heating rolls,
It is a process schematic diagram near a heating roll.

FIG. 4 is a process schematic diagram in the vicinity of a heating roll showing a case where heating by a heating roll is different.

FIG. 5 is a process schematic diagram in the vicinity of a heating roll showing an example of heating both sides of a foamed sheet.

FIG. 6 is a vertical cross-sectional view of an example of the instant food container of the present invention.

FIG. 7 is an explanatory diagram showing conditions for measuring the glossiness of the surface of the foam sheet.

[Explanation of symbols]

 1 Thermoformed Laminated Sheet 2 Polystyrene-based Resin Extruded Foamed Sheet 3 Polystyrene-based Resin Non-foamed Sheet 9 Immediate Food Container

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B32B 27/30 B 8413-4F B65D 1/09 // B29K 25:00 105: 04 B29L 9:00 22:00

Claims (2)

[Scope of utility model registration request] 1. A density of 0.075 to 0.15 g / c
m ^3, a thickness and extruded polystyrene resin foam sheet of 1.0 to 2.5 mm, unit weight comprising a polystyrene resin non-foamed sheet having a thickness 0.05~0.2mm 350
In the laminated sheet of up to 450 g / m ² , the average glossiness of the foamed sheet side surface of the laminated sheet is 7.5% or less, and the difference between the maximum glossiness and the minimum glossiness is within 3.0%. A laminated sheet for thermoforming. 2. A container for instant food, which is obtained by thermoforming the laminated sheet for thermoforming according to claim 1.