JP2009202943A - Paper container to be heated by microwave range - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper container to be heated by a microwave range which can effectively discharge steam or condensation generated from contents, prevent the contents from being moist, and give scorch to the contents without deteriorating the sense of eating or taste and without having a problem in a filling and sealing property. <P>SOLUTION: The paper container (100) to be heated by the microwave range is formed by assembling a laminated body consisting of a paper base material (2), a resin layer (1) having an entire surface formed with a resin capable of being thermally sealed to one surface of the paper base material (2) and an inner surface side resin layer (3) having a foaming processed thermoplastic resin layer partly formed on the other surface of the paper base material so as to locate the inner surface side resin layer (3) in the inner surface. In at least a part of the inner surface of the container (100), a susceptor (5) which can generate heat by a microwave is attached on the inner surface side resin layer (3). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a microwave heated paper container for storing frozen foods (fried potatoes, fried chicken, dumplings, shumai, takoyaki, okonomiyaki, etc.) that are heated and tasted in a microwave oven.

  Conventionally, in food containers for heating microwave ovens, in recent years, paper containers having good disposal property after use and good recyclability have been widely used. Paper containers are suitable for storing various foods by providing water resistance, oil resistance, barrier properties, etc. by laminating plastic resin, etc. as necessary. It is suitable as a microwave oven heating paper container that can be heated in a range.

  However, a paper container for storing frozen side dishes such as fried potatoes, deep-fried chicken, dumplings, shumamai, etc. that is heated with a microwave oven, is free from water vapor and condensation generated from the contents. There was a problem that it could not be effectively released, and the contents became damp and the texture and flavor were impaired. In the case of such a paper container, it is common to use a dedicated filling and packaging machine for filling and packaging the contents. In such a filling and packaging line, a heat sealing method is often adopted for sealing a side flap of a paper container, and it is necessary to be able to cope with a heat sealing device.

  As countermeasures against various concerns as described above, as shown in FIG. 6, a susceptor (heating element) (50) is attached to an adhesive layer (50) on a paper substrate (20) such as card paper, oil-resistant paper, water-absorbing paper or the like. 40), there is an example using a laminated sheet laminated through, but in this case, the texture and texture are good, but the heat sealing resin is not applied to the paper substrate (20) The heat sealing process in the heat sealing device in the filling and packaging line for filling and packaging the contents in the paper container is impossible, and the filling and sealing cannot be performed.

  Next, as shown in FIG. 7, a resin layer (10) is formed on one entire surface of a paper substrate (20) such as paperboard, and the inner surface side resin layer (30), adhesive layer ( 40), there is an example using a laminated sheet in which the susceptor (50) is sequentially laminated. In this case, the content and the filling sealability are good, but when heated in a microwave oven, the contents Since water vapor and dew condensation generated from the object cannot be effectively released, the contents become damp and there is a problem that the texture and flavor are impaired.

  By the way, in the case of a tray shape with different forms of paper containers, a microwave oven heated paper container has been developed in which a susceptor is disposed on the entire surface of the paper container and a vapor vent hole is provided in a part of the susceptor (for example, Patent Documents). 1). In the case of such a container, water vapor or dew condensation generated from the contents can be effectively released, so that the contents do not become damp, the texture and flavor are not impaired, and the filling sealability is not a problem.

  However, there is a possibility that the inside of the microwave oven may be soiled because water vapor and oil components come out from the vapor vent arranged at the bottom of the container.

JP 2005-82197 A

  The present invention is intended to solve such problems of the prior art, and stores frozen foods (fried potatoes, deep-fried chicken, dumplings, shumai, takoyaki, okonomiyaki, etc.) that can be tasted by heating in a microwave oven. In a microwave heated paper container, water vapor and condensation generated from the contents can be effectively released, the contents do not become damp, can be imparted with a kotaku, do not impair the texture and flavor, and have a filling seal It is an object of the present invention to provide a microwave heating paper container that is free from problems.

  The present invention has been made to solve the above problems, and the invention according to claim 1 of the present invention includes a paper base (2) and a heat seal on one side of the paper base (2). A laminate comprising a resin layer (1) formed with a possible resin on the entire surface and an inner surface side resin layer (3) partially formed with a foamed thermoplastic resin layer on the other surface is formed into the inner surface side resin layer. (3) is a container (100) assembled so as to be an inner surface, and at least a part of the inner surface of the container (100) is provided with a susceptor (5) capable of generating heat by microwaves on the inner surface side resin layer (3). It is a microwave oven heating paper container characterized by being attached to.

  The invention according to claim 2 of the present invention is the microwave oven paper container according to claim 1, wherein the melting point of the resin of the inner surface side resin layer (3) is the melting point of the thermoplastic resin of the resin layer (1). It is a microwave heating paper container characterized by being lower than the above.

  According to a third aspect of the present invention, in the microwave oven heating paper container according to the first aspect, a foaming agent that is foamed by heating is added to the resin of the inner surface side resin layer (3). It is the microwave oven heating paper container characterized.

  The invention according to claim 4 of the present invention is the microwave heating paper container according to claim 1, wherein the foamed inner surface side resin layer (3) is provided with a plurality of lines provided with a predetermined width and interval. It is a microwave oven heating paper container characterized by being formed in a shape.

  The invention according to claim 5 of the present invention is the microwave heating paper container according to claim 4, wherein the width and interval of the linear inner surface resin layer (3) are in the range of 5 to 15 mm, respectively. It is the microwave oven heating paper container characterized.

  The invention according to claim 6 of the present invention is the microwave heating paper container according to any one of claims 1 to 5, wherein the susceptor (5) is at least on one side of the film substrate (6). A microwave heating paper container comprising a microwave heating layer (7) and a paper layer (9) laminated on the microwave heating layer (7).

  The invention according to claim 7 of the present invention is the microwave oven heating paper container according to claim 6, wherein the microwave heating layer (7) is formed of a metal vapor deposition layer. It is a container.

  The invention according to claim 8 of the present invention is characterized in that, in the microwave oven heated paper container according to any one of claims 1 to 7, the susceptor (5) is pasted using a window pasting machine. It is a microwave oven heating paper container.

The microwave heating paper container according to the present invention includes a paper base, a resin layer formed on the entire surface of a heat-sealable resin on one side of the paper base, and a foamed thermoplastic resin layer on the other side. And a susceptor capable of generating heat by microwaves on at least a part of the inner surface of the container, wherein the inner surface side resin layer is an inner surface. By mounting on the side resin layer, it can effectively release water vapor and dew condensation generated from the contents of frozen foods that are heated with a microwave oven, and the contents do not become moist and can also give kotaku In addition, the texture and flavor are not impaired, and the filling sealability is also good.

It is a top view which shows the state of the blank of the microwave oven heating paper container which concerns on this invention. It is a sectional side view which shows one Example of the laminated constitution which stuck the susceptor to the laminated body which comprises the microwave oven heating paper container which concerns on this invention. In the laminated body which comprises the microwave oven heating paper container which concerns on this invention, it is a top view which shows the state which laminated the inner surface side resin layer in the shape of multiple lines with predetermined width and space | interval. It is a perspective view which shows one Example of the microwave oven heating paper container which concerns on this invention. It is a sectional side view which shows one Example of the laminated constitution of a susceptor. It is a sectional side view which shows one Example of the laminated constitution which comprises the conventional microwave oven heating paper container. It is a sectional side view which shows the other Example of the layer structure of the laminated body which comprises the conventional microwave oven heating paper container.

  The embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5, but is not particularly limited thereto.

  FIG. 1 is a plan view showing a state in which a blank of a microwave heating paper container according to the present invention (planar unfolded state before assembling into a container) is viewed from the inner side of the container. FIG. 2 is a cross-sectional view showing the layer structure of the microwave heating paper container according to the present invention. FIG. 3 is a plan view showing a state in which the inner surface side resin layer is foamed into a plurality of lines with a predetermined width and interval in the laminate constituting the microwave heating paper container according to the present invention. FIG. 4 is a perspective view showing one embodiment of the microwave heating paper container according to the present invention. FIG. 5 is a side sectional view showing one embodiment of the layer structure of the susceptor.

First, the structure of the microwave heating paper container of this invention is demonstrated.
FIG. 1 is a plan view showing a state of the microwave heating paper container blank of the present invention as viewed from the side that is the inner side of the container (a state in which the blank is assembled before being assembled into the container). A foam-processed portion (3A) of the inner surface side resin layer (3) is provided in a plurality of lines with a predetermined width and interval on the inner surface of a paper base (2) described later. Further, a susceptor (5) capable of generating heat by microwaves is arranged at a bottom portion when the container is assembled.

  FIG. 2 schematically shows a cross-sectional view taken along the line D-D ′ of FIG. 1. A paper base (2), a resin layer (1) having a heat-sealable resin formed on one side of the paper base (2), and a thermoplastic resin layer foamed on the other side In the laminate comprising the formed inner surface side resin layer (3), a susceptor (5) is further mounted on the inner surface side resin layer (3) via an adhesive layer (4).

Next, a method for manufacturing a microwave heating paper container having a layer structure as shown in FIG. 2 will be described.
[Resin layer forming step]
In the resin layer forming step, the form of the paper substrate (2) may be either a long web or a rectangular sheet. First, a resin layer (1) is formed with a heat-sealable resin on the entire surface of one side of the paper substrate (2), and then an inner surface resin with a heat-sealable resin on the other side of the paper substrate (2). Layer (3) is formed. This order may be reversed, and the resin layer (1) and the inner surface resin layer (3) may be formed simultaneously using an apparatus capable of simultaneous sealing on both sides. At this time, the inner surface resin layer (3) is not foamed yet. In addition, you may print a pattern etc. on the single side | surface of a paper base material (2) before formation of a resin layer (1).

[Foaming process]
Next, foaming is performed so that only a predetermined portion (3A) of the inner surface side resin layer (3) is foamed.
As a foaming method of the inner surface side resin layer (3), for example, there is a method of selecting and applying any one of hot air, infrared rays, ultraviolet rays, radiation, laser beams, etc. only to a predetermined foamed portion (3A). . The thicknesses of the foamed portion (3A) and the unfoamed portion (3B) may be the same or different.

  The resin layer (1) on the outer surface of the paper substrate (2) is not foamed, and only the inner resin layer (3) on the inner surface is foamed. The melting point of the resin (3) needs to be lower than the melting point of the resin of the resin layer (1) on the outer surface of the paper base (2).

  As another method of foaming only the inner surface side resin layer (3) on the inner surface of the paper substrate (2), a foaming agent is applied only to the resin of the inner surface side resin layer (3) on the inner surface of the paper substrate (2). There is also a method of adding.

  By adding a foaming agent to the resin, fine bubbles are generated, and the fine bubbles induce foaming of the resin by heat energy such as hot air. As a result, the foamability is increased and a uniform foamed layer is formed. Therefore, it is possible to exhibit high absorptivity against water vapor and condensation from the contents during microwave heating, and the effect of not moistening the contents is improved.

[Punching process]
In the punching step, a cut for finally forming a shape that can be assembled into a container is formed on the paper base material (2) on which the resin layer (1) and the inner surface resin layer (3) are formed by a cutting device. The cutting device presses the cutting blade against the paper substrate (2) with a press mechanism, and cuts in a predetermined shape. In this punching process, it is possible to make the paper substrate (2) into a blank shape as shown in FIG. 1, but it is connected to the surroundings without being completely cut out for ease of handling in the subsequent process. In many cases, it is left so that it can be handled in the form of a long web or a rectangular sheet.

[Susceptor pasting process]
If a portion connected to the surroundings is left without being cut out completely in the punching process, the connected portion is cut to obtain the blank shape of FIG. Next, a susceptor (5) having an adhesive layer (4) formed on one side is attached to the side of the paper base (2) where the inner surface side resin layer (3) is present. The affixing position is desirably the part that becomes the bottom when the paper base (2) is assembled as a container. This is because the susceptor (5) and the frozen food are in contact with each other in order to efficiently transmit the heat generated from the susceptor (5) to the frozen food.

[Side seal process]
Next, as shown in FIG. 4, the resin layer (1) of the blank-shaped box side part (a) and the inner surface resin layer of the box side part (A) are bonded together. As a bonding method, it can be carried out by an existing box making method in which bonding is performed by heat or an adhesive. An example of a method of laminating by heat is a method using a frame sealer used in the production of liquid paper containers, and an example of a method of laminating by adhesive is a sack pasting used in the production of general paper containers. There are methods by machine.

[Filling process]
Further, as shown in FIG. 4, the resin layer (1) of the side flap (c) in the form after side sealing and the inner surface resin layer (3) of the side flap (d) are bonded to each other like a container (100). Assemble. Further, after filling the contents (frozen food), the two flaps at the opposite positions of the side flaps (c) and (d) are also bonded together. This process is called a filling seal. As a bonding method, a heat sealing device or a hot melt device installed in an existing filling line can be used.

  In addition, when bonding with a heat seal device, it is necessary to pay attention because the bonding does not succeed if the ratio of the area of the foamed portion (3A) of the side flap portion is too large. Considering the bonding, as shown in FIG. 3, the predetermined linear width (L1) and interval (L2) of the foamed portion (3A) are preferably in the range of 5 to 15 mm, In particular, the combination of L1 = 10 mm and L2 = 10 mm is more preferable in order to sufficiently cope with the filling sealability in the filling and packaging machine.

  The above is the description of the manufacturing process of the paper container of the present invention. The order of the above steps can also bring the foaming step after the punching step.

  In this way, the resin layer (1) is formed on the entire outer surface of the paper container and the inner surface-side resin layer (3) on the inner surface is partially foamed so that it can be sealed with a heat sealing device of a filling and packaging machine. In addition, since the water vapor and dew condensation from the contents during heating in the microwave oven can be absorbed by the foamed part (3A), there is an effect that the contents do not become moist. Further, by providing the resin layer (1) on the entire outer surface of the paper container, it is possible to prevent the frozen side dishes (fried potatoes, deep-fried food, etc.) from becoming overdried (cask texture).

  As a method of forming the resin layer (1) on the entire outer surface of the paper substrate (2) and providing the inner surface side resin layer (3) on the inner surface of the paper substrate (2), a known extruder is used. However, in the present invention, it is preferable to use a cardboard tandem machine from the viewpoint of improving productivity.

  The resin used for the resin layer (1) and the inner surface side resin layer (3) can be a heat-sealable thermoplastic resin or the like. For example, linear low density polyethylene resin (L-LDPE), low Density polyethylene resin (LDPE), medium density polyethylene resin (MDPE), high density polyethylene resin (HDPE), polypropylene resin (PP), polyethylene terephthalate resin (PET), polybutylene terephthalate resin (PBT), methylpentene copolymer (TPX) Etc. Specifically, the low density polyethylene resin (LDPE) includes Asahi Kasei L2340E, the polypropylene resin (PP) includes Hipole F769, Sun Allomer Sun Aroma PH933S, and the like.

  As described above, in order to foam only the inner surface side resin layer (3) on the inner surface of the paper base material (2), the melting point of the resin of the inner surface side resin layer (3) on the inner surface of the paper base material (2) is Since it is necessary to be lower than the melting point of the resin of the resin layer (1) on the outer surface of the paper substrate (2), it is necessary to select a combination of resins used for the outer surface and the inner surface. For example, various combinations such as (outer surface) polypropylene resin (PP) / low density polyethylene resin (LDPE) (inner surface), (outer surface) high density polyethylene resin (HDPE) / low density polyethylene resin (LDPE) (inner surface) are possible It is.

  As another method of foaming only the inner surface side resin layer (3) on the inner surface of the paper substrate (2), a foaming agent is added to the resin of the inner surface side resin layer (3) on the inner surface of the paper substrate (2). Although a method may be used, as the foaming agent, for example, inorganic sodium hydrogen carbonate, ammonium hydrogen carbonate, ammonium carbonate, or the like can be used. Examples of the organic system include azo compounds, nitroso compounds, sulfonyl hydrazide compounds, sulfonyl semicarbazide compounds, tetrazole compounds, and the like. The addition amount of these foaming agents to the resin is sufficient if fine bubbles are generated, so an addition amount of 0.01 to 5% is sufficient.

  The thickness of the resin layer (1) on the outer surface of the paper substrate (2) and the inner resin layer (3) on the inner surface is preferably in the range of 10 to 50 μm.

  As the paper substrate (2), virgin paper having a basis weight of 260 to 500 g / m 2, cardboard such as card paper (for example, Mitsubishi Paper Pearl Card, Hokuetsu Paper NEW Tough Ivory, JF Cup base paper, etc.) can be used. .

  As the other paper base (2), the above-mentioned oil-resistant paper (for example, Miracle KC manufactured by Yamagata Paper Co., Ltd.) in which an oil-resistant agent is added to paperboard such as virgin paper and card paper having a basis weight of 260 to 500 g / m 2. Koyo Paper's TSU ivory, etc.) or oil-resistant type coated on the inner surface (food contact side) (for example, Koyo Paper's Eco Valley V, Eco Valley K, Keio Paper King Fresh, etc.) and water absorbent paper (Yamazaki Paper Miracle GZ, Mitsubishi Paper Precious G, etc.) can be used.

  Next, the susceptor (5), which has a role of improving the texture and flavor by adding a kotter to the contents stored in the paper container, is formed of a metal vapor deposition layer on at least one surface of the film substrate (6). The microwave heat generating layer (7) is provided, and the paper layer (9) is laminated on the microwave heat generating layer (7) through the adhesive layer (8).

  The film substrate (6) is not particularly limited as long as it has metal deposition processing suitability, and may be selected according to the amount of heat to be generated. For example, polyethylene terephthalate, Polyethylene such as butylene terephthalate and polybutylene 2/6 naphthalate, polyolefin such as polyethylene and polypropylene, polyamide such as 6 nylon and 12 nylon, aromatic polyamide, polyimide and the like, and the co-polymerization of these polymers with other organic polymers A film made of coalescence or the like can be mentioned.

  Various additives such as an antistatic agent, a lubricant, and an antioxidant may be added to the polymer or copolymer. The thickness of these films is not particularly limited, but is preferably in the range of 6 to 100 μm in consideration of suitability for machining such as vapor deposition.

  As the metal vapor deposition layer of the microwave heating layer (7) constituting the susceptor (5), vapor deposition thin films of aluminum, tin, zinc, iron, copper, and the like and a mixed layer of aluminum and aluminum oxide can be considered. Aluminum is preferably used in consideration of the problem of sparks during heating.

  In consideration of flame retardancy and processability, the paper layer (9) has a basis weight of about 20 to 400 g / m @ 2 and relatively heat resistance. For example, unexposed neutral paper, glassine paper, and aluminum hydroxide Use of paper or the like is preferable.

  The adhesive layer (4, 8) is not particularly limited as long as it is generally used as a food packaging material made of an adhesive such as a normal silicon resin, polyester resin, acrylic resin, vinyl acetate resin. Are, for example, acrylic resins (PZ-804, PZ-805, etc. made by Seiden Chemical), EVA (DBA-136, etc., made by Seiden Chemical), acrylic resins and vinyl acetate copolymer, modified vinyl acetate resins (Yei Kayaku Y) −6 etc.). In particular, when considering heat resistance, a silicone resin adhesive is preferable.

  Affix the paper layer (9) side of the susceptor (5) for attaching a fret to frozen food to a predetermined location on the inner surface side resin layer (3) side of the inner surface of the paper container blank, for example, the bottom of the paper container. As a method, there is a method of pasting using a window pasting machine.

  As described above, the microwave heating paper container according to the present invention has a polypropylene resin (PP) on the entire outer surface of the paper base (2) made of paperboard such as virgin paper or card paper having a basis weight of 260 to 500 g / m2. ) And the like, a resin layer (3) such as a low density polyethylene resin is provided on the entire inner surface of the paper substrate (2), and the inner surface resin layer (3) of the inner surface is partially formed. In addition, a microwave heating layer (7) formed of an aluminum vapor deposition layer is provided on one side of a film base material (6) made of a foamed laminate and further made of a polyethylene terephthalate film or the like. A susceptor (5) in which an unexposed paper layer (9) such as neutral paper is laminated on a wave heat generating layer (7) via an adhesive layer (8) made of an acrylic resin adhesive or the like is a predetermined inner surface of the paper container. Acrylic resin system It is a microwave oven heated paper container pasted by using a window pasting machine or the like through an adhesive layer (4) such as an adhesive.

  Thus, the microwave heating paper container according to the present invention includes a paper base (2), a resin layer (1) in which a heat sealable resin is formed on one side of the paper base (2), and the other side. A container (100) in which a laminate comprising an inner surface side resin layer (3) partially formed with a foamed thermoplastic resin layer on the surface is assembled so that the inner surface side resin layer (3) is the inner surface A susceptor (5) capable of generating heat by microwaves is attached to at least a part of the inner surface of the container (100) on the inner surface side resin layer (3), so that the refrigeration is accomplished by heating in a microwave oven. Can effectively release water vapor and condensation generated from the contents of sugar beet (fried potatoes, deep-fried food, etc.), the contents do not become damp, can give kotomi, and do not impair the texture and flavor. Filling sealability is also good.

  The present invention will be described in detail with specific examples.

<Example 1>
First, using a cardboard tandem machine, a polypropylene resin layer (PP layer) having a thickness of 30 μm using polypropylene resin (Sun Allomer PH933S manufactured by Sun Allomer Co., Ltd.) on the entire outer surface of a pearl card paper (manufactured by Mitsubishi Paper) having a basis weight of 310 g / m 2 ( A melting point of about 140 ° C. is formed, and a low density polyethylene resin (L2340E manufactured by Asahi Kasei) is used on the inner surface (food contact surface) to form a 20 μm thick low density polyethylene resin layer (LDPE layer) (melting point of about 112 ° C.). And a laminate obtained by foaming the low density polyethylene resin layer (LDPE layer) with hot air at a linear width of 10 mm and an interval (pitch) of 10 mm [polypropylene resin layer (PP layer) (thickness 30 μm) / pearl card Paper (basis weight 310 g / m 2) / low density polyethylene resin layer (LDPE layer) with foamed part (thickness 20 μm)] Was made.

  In a separate process, a 65 nm thick aluminum vapor deposition layer is formed on one side of a 12 μm thick biaxially stretched polyethylene terephthalate film to provide a microwave heating layer, and the microwave heating layer is made of an acrylic resin adhesive. Susceptor in which unbleached neutral paper having a basis weight of 40 g / m 2 is laminated through an adhesive layer [biaxially stretched polyethylene terephthalate film (thickness: 12 μm) / aluminum deposition layer (film thickness: 65 nm) / adhesive layer / paper layer ( Basis weight 40 g / m @ 2)].

  Next, the laminate is punched into the shape of blanks, and an acrylic resin adhesive (PZ-804 made by Seiden Chemical) is used at the bottom of the surface that comes into contact with the contents. The paper layer side of the susceptor was bonded together, and then side-sealed with a heat sealer to obtain a microwave heated paper container of Example 1.

  Below, the comparative example of this invention is demonstrated.

<Comparative Example 1>
Using a cardboard tandem machine, a low-density polyethylene resin layer (LDPE layer) 30 μm thick using a low-density polyethylene resin (L2340E manufactured by Asahi Kasei) on the entire outer surface of pearl card paper (Mitsubishi Paper) with a basis weight of 310 g / m 2 (Melting point: about 112 ° C.), a low density polyethylene resin (L2340E manufactured by Asahi Kasei) is used on the entire inner surface (food contact surface), and a low density polyethylene resin layer (LDPE layer) having a thickness of 30 μm (melting point: about 112 ° C. ) Was formed (PE / paper / PE = poly sand paper).

  Subsequently, the obtained laminate was punched into blanks and side-sealed with a frame sealer to obtain a microwave heated paper container of Comparative Example 1.

<Comparison evaluation>
The microwave oven heated paper container obtained in Example 1 and Comparative Example 1 was filled and packaged with French fries. The filling sealability in the filling and packaging line, the texture of the french fries after heating in the microwave, and the degree of texture were evaluated.

<Evaluation method>
(1) Texture: Sensory evaluation of the texture of French fries after heating in a microwave oven for 500 W × 3 minutes was performed with 10 monitors (N = 10). ○: Hard or slightly hard. X: Soft.
(2) Filling sealability: Check the state of the filling seal when filled and packaged at a sealing temperature of 300 ° C. and a line speed of 50 pieces / minute. ○: Paper missing, N = 20.
Note that the paper removal means that when two sheets of paper are pasted together and then peeled off, the surface layer part of one piece of paper is peeled off and moved to the other piece of paper. . If this paper spot is generated, it means that the adhesive strength of the adhesive is stronger than the strength of the surface layer of the paper, and the adhesive state is good. (Conversely, if the surface layers of the paper at the bonding location remain clean, it means that the adhesion is poor.)
(3) Kogation weighting: The state of kogation of French fries after heating in a microwave oven for 500 W × 3 minutes was observed. ○: Yes, ×: No, N = 5.
The results are shown in Table 1.

表１には、実施例１及び比較例１で得た電子レンジ加熱用紙容器にフライドポテトを充填包装し、その充填包装ラインでの充填シール性、電子レンジ加熱後のフライドポテトの食感、コゲ目の付き具合の比較評価結果を記す。

Table 1 shows the filling and packaging of French fries in the microwave heating paper containers obtained in Example 1 and Comparative Example 1, filling and sealing properties in the filling and packaging line, texture of french fries after microwave heating, Describe the results of comparative evaluation of eye contact.

<Comparison result>
(1) Texture: In Example 1, since the inner surface side resin layer of the inner surface (food contact surface) of the paper container is foamed, dew can be sucked, so the texture of the fries is not moist. In Comparative Example 1, since there is no exposed portion of the paper, the french fries are moistened by condensation, so the texture is soft and the texture is poor.
(2) Filling sealability: Good in both Example 1 and Comparative Example 1 due to paper smears.
(3) Koge texture: Example 1 has good koge texture. Since Comparative Example 1 was not provided with a susceptor, it was not stained.

DESCRIPTION OF SYMBOLS 1 ... Resin layer 2 ... Paper base material 3 ... Inner surface side resin layer 3A ... Foam processing part 3B ... Unfoamed part 4 ... Adhesive layer 5 ... Susceptor 6 ... -Film base material 7 ... Microwave heating layer 8 ... Adhesive layer 9 ... Paper layer 10 ... Resin layer 20 ... Paper base material 30 ... Inner surface side resin layer 40 ... Adhesive layer 50 ... Susceptor 100 ... Microwave heating paper container L1 ... Width L2 ... Interval A ... Box side part I ... Box side part U ... Flap D ... flap

Claims (8)

  It comprises a paper base, a resin layer in which a heat-sealable resin is formed on one side of the paper base, and an inner surface side resin layer in which a foamed thermoplastic resin layer is partially formed on the other side. A container in which the laminate is assembled so that the inner surface side resin layer becomes the inner surface, and a susceptor capable of generating heat by microwaves is attached to the inner surface side resin layer on at least a part of the inner surface of the container. Microwave oven heated paper container.   2. The microwave heating paper container according to claim 1, wherein a melting point of a resin of the inner surface side resin layer is lower than a melting point of a thermoplastic resin of the resin layer.   The microwave oven heating paper container according to claim 1, wherein a foaming agent that foams by heating is added to the resin of the inner surface side resin layer.   2. The microwave heating paper container according to claim 1, wherein the foamed inner surface resin layer is formed in a plurality of lines provided with a predetermined width and interval.   5. The microwave heating paper container according to claim 4, wherein the linear inner surface side resin layer has a width and an interval of 5 to 15 mm, respectively.   6. The susceptor has a configuration in which a microwave heat generation layer is provided on at least one surface of a film base material, and a paper layer is laminated on the microwave heat generation layer. A microwave heating paper container as described in 1.   The microwave heating paper container according to claim 6, wherein the microwave heating layer is formed of a metal vapor deposition layer.   The microwave oven heated paper container according to any one of claims 1 to 7, wherein the susceptor is pasted using a window pasting machine.

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