JP5834479B2 - Paper container - Google Patents

Description

  The present invention relates to a paper container for storing food products, beverages, and the like, and more particularly to a cup-shaped paper container suitable for cooking by a microwave oven or selling by a hot bender.

  As containers for storing food and beverages, containers of various shapes and various shapes are used. In recent years, containers using paper, which is a reproducible resource, have attracted particular attention against the background of increasing awareness of global environmental protection. Among them, the cup-shaped paper container is widely used as a container for storing various foods, beverages and the like in addition to the original paper cup use because of its ease of use and ease of manufacture.

  As a general shape of the cup-shaped paper container, as shown in FIGS. 17 (a) and 17 (b), a bottom member (200) and a bottom member (300) are formed into a reverse tray shape. The bottom sleeve (250) is generally formed by winding the lower end portion of the body member (200) around the peripheral edge portion (310) of 300) and thermocompression bonding. The upper end portion of the body member (200) is crushed after wrap-up forming to form a flange portion (230), and a separately prepared lid member (not shown) is detachably sealed and sealed.

  When the contents are put into such a raised bottom paper container and heated in a microwave oven, the contents of the body member (200) are in direct contact with the contents, so that the temperature does not exceed 100 ° C., Since the portion of the bottom sleeve (250) is not in direct contact with the contents, depending on the characteristics of the microwave oven, the bottom sleeve (250) is heated to 100 ° C. or higher, and “burn” (400) as shown in FIG. Occasionally, a phenomenon occurs.

  This “burn” phenomenon is related to the characteristics of the microwave oven and the location in the microwave oven, and does not always occur, but this is why paper cup containers are actively used for microwave heating applications. It was also a reason why I couldn't.

  The microwave oven paper cup described in Patent Document 1 is made to solve this problem, and in order to prevent the bottom sleeve from being formed, as shown in FIG. The bottom sleeve is not formed by forming (300) into a flat shape without forming a reverse tray, and folding the body member (200) into the bottom member (300) and only crushing it by 90 °. It is what I did.

Japanese Patent No.3953584

  Since the bottom sleeve is not present in the microwave oven paper cup described in Patent Document 1, the bottom sleeve does not cause a burn phenomenon, but the leg portion (260) exists even though it is crushed. It was not completely in close contact with the table, and therefore was not suitable for a hot bender in which products were placed on a hot plate and heated. In addition, because of the structure, the end surface of the bottom member is in contact with the contents, and therefore, retort sterilization treatment cannot be performed.

The problem to be solved by the present invention is to propose a cup-type paper container that is excellent in heat aptitude by a hot plate and does not cause burning even when heated directly in a microwave oven, and a cup-type paper container that enables retort sterilization treatment It is.

As a means for solving the above-mentioned problems, the invention according to claim 1 is a cylindrical shape formed from a body forming blank having a paper layer and a thermoplastic resin layer provided on both sides of the paper layer. The torso;
A top surface portion having a paper layer and a thermoplastic resin layer provided on both sides of the paper layer, and sealing an opening above the body portion;
A bottom surface portion for sealing an opening below the body portion;
A paper container comprising:
The top surface portion has a peripheral edge bent upward,
The body part is a body part bonding part in which both side edges of the body part forming blank are overlapped and sealed; and
An upper folded portion formed by folding the upper end of the body portion inward;
A flange portion formed by rolling the lower end portion of the body portion outside and then flatly crushing,
Have
The peripheral portion of the top surface portion is tightly sealed in a state of being inserted into the upper folded portion of the trunk portion,
Furthermore, the flange part and the bottom part are tightly sealed ,
The trunk portion has an opening band formed by two parallel perforation lines or two parallel half-cut lines, and the leading end of the opening band forms an opening tab separated from the trunk portion.
The band opening start part serves as a function for opening to consume the contents and a steam vent for discharging steam generated when the package filled with the contents is cooked.
The steam vent is formed by a release layer applied to a portion corresponding to the unsealing band of the body pasting portion, and is opened by the pressure of steam generated when the package filled with contents is cooked. This is a paper container.

  The invention according to claim 2 is the paper container according to claim 1, wherein an area of the top surface portion is smaller than an area of the bottom surface portion.

  According to a third aspect of the present invention, in the paper container according to the first or second aspect, the bottom surface portion includes a paper layer and a thermoplastic resin layer provided on both sides of the paper layer. It is.

Further, according to a fourth aspect of the present invention, in the paper container according to any one of the first to third aspects , one or more of the opening bands are provided so as to circulate around the trunk portion horizontally. It is.

The invention according to claim 5 is the paper container according to any one of claims 1 to 3 , wherein the opening band is provided so as to spiral around the body portion. .

The invention according to claim 6 is a cylindrical body formed from a body forming blank having a paper layer and a thermoplastic resin layer provided on both sides of the paper layer;
A top surface portion having a paper layer and a thermoplastic resin layer provided on both sides of the paper layer, and sealing an opening above the body portion;
A bottom surface portion for sealing an opening below the body portion;
A paper container comprising:
The top surface portion has a peripheral edge bent upward,
The body part is a body part bonding part in which both side edges of the body part forming blank are overlapped and sealed; and
An upper folded portion formed by folding the upper end of the body portion inward;
A flange portion formed by rolling the lower end portion of the body portion outside and then flatly crushing,
Have
The peripheral portion of the top surface portion is tightly sealed in a state of being inserted into the upper folded portion of the trunk portion,
Furthermore, the flange part and the bottom part are tightly sealed,
The top surface portion has an opening portion that is releasably sealed by a tab material, and the opening portion discharges steam generated when the packed package is cooked and cooked. Also serves as a steam vent
The vapor vent is formed by a release layer applied to a portion corresponding to the opening start portion of the opening.
Formed Te, a paper container you, characterized in that the opening by the pressure of steam generated upon heating cooking package filled with contents.

  In the paper container according to the present invention, the bottom structure is a structure in which the bottom surface portion is tightly sealed to the flange portion formed by rolling the lower end portion of the body portion outward and then flattened, so that the bottom surface is flat. Therefore, when heated in a microwave oven, there is no burning. In addition, it is suitable for a hot bender of a type that is placed on a hot plate and heated.

  In addition, since at least the body and the top surface include a paper layer, there is a heat insulation property. Therefore, there is an advantage that a hand is not hot in handling during heating as compared with a metal can or a glass bottle.

Further, by providing an opening band formed by two perforation lines parallel to the body part or two half-cut lines parallel to the body part, the opening becomes easy. Since it also serves as a steam vent for discharging steam generated when the package filled with is cooked, it is a paper container suitable for cooking with a microwave oven .

In addition, the steam vent is formed by a release layer applied to the site corresponding to the opening band of the body laminating portion, and automatically by the pressure of steam generated when the package filled with the contents is cooked Since the opening is made, it is possible to save the trouble of opening the steam vent, and even if the container is heated in a microwave oven without inadvertently creating the steam vent, the container does not rupture .

According to the second aspect of the present invention, since the paper container has an inverted shape of a normal paper cup, it can be manufactured using a normal paper cup manufacturing apparatus. Moreover, since the area of the bottom surface is larger than the area of the top surface, the heating efficiency by the hot plate is good. Moreover, it is excellent in stability as a container .

According to the invention described in claim 3 , in addition to the body portion and the top surface portion of the paper container, the bottom surface portion also includes the paper layer, thereby making it possible to further increase the composition ratio of the paper, and to protect the global environment. It will come true according to the purpose .

According to the fourth aspect of the present invention, since the opening band is provided so as to circulate the body part horizontally, the opening when opened is horizontal, and the contents can be easily taken out. Further, by providing two or more unwrapping bands, it becomes possible to open in stages as the contents are reduced, and it becomes easier to take out the contents .

According to the fifth aspect of the present invention, since the opening band is provided so as to circulate around the trunk portion, it can be gradually opened according to the decrease in the contents. This feature also brings unexpectedness and fun when opening. Moreover, since there is no part which is separated even if it is opened, no garbage is generated .

According to the invention described in claim 6 , since the opening portion provided in the top surface portion of the paper container is releasably sealed by the tab material, the opening portion is at the top of the container, and is made of paper. It is also suitable for drinking with a mouth when it is used as a container for storing drinks that are warmed. Moreover, since the opening part also serves as a steam vent part for discharging steam generated when the package filled with the contents is cooked, it is also suitable for cooking with a microwave oven.

Further , according to the invention described in claim 6 , the steam vent is formed by a release layer applied to a portion corresponding to the opening start portion of the opening, and steam generated when the package is cooked. Because it automatically opens with the pressure of the tank, there is no need to open the steam vent hole, and even if it is heated in a microwave oven without inadvertently making the steam vent hole, the container may burst. There is nothing.

FIG. 1 is a perspective view showing an embodiment of a paper container according to the present invention. FIG. 2A is a schematic cross-sectional view showing the A-A ′ cross section of the paper container shown in FIG. 1. FIG. 2B is a partial enlarged cross-sectional schematic view of the top surface portion. FIG.2 (c) is a partial expanded cross-section schematic diagram of a trunk | drum. FIG. 3 is a perspective view showing a state in which contents are stored in the paper container shown in FIG. 1 and heated in a microwave oven. FIG. 4 is a schematic plan view showing the top surface forming blank and the body forming blank of the paper container shown in FIG. 1. FIG. 5 is a perspective view showing another embodiment of the paper container according to the present invention. 6 is a schematic plan view showing the top surface forming blank and the body forming blank of the paper container shown in FIG. FIG. 7 is a perspective view showing another embodiment of the paper container according to the present invention. FIG. 8 is a schematic plan view showing the top surface forming blank and the body forming blank of the paper container shown in FIG. FIG. 9 is a perspective view showing another embodiment of the paper container according to the present invention. FIG. 10 is a schematic cross-sectional view showing a B-B ′ cross section of the paper container shown in FIG. 9. FIG. 11 is a perspective view showing an embodiment of a paper container according to claim 10 of the present invention. 12 is a schematic cross-sectional view showing a C-C ′ cross section of the paper container shown in FIG. 11. FIG. 13A is a schematic cross-sectional view showing a D-D ′ cross section of the paper container shown in FIG. 11. FIG.13 (b) is a partial expanded cross-section schematic diagram of the trunk | drum bonding part in FIG.13 (a). FIG.13 (c) is a partial expanded cross-section schematic diagram of the top | upper surface part in FIG. FIG. 14 is an explanatory view showing a method of creating the trunk forming blank of the paper container shown in FIGS. 15 (a) and 15 (b) are explanatory views showing a method of creating the trunk forming blank for the paper container shown in FIGS. FIG. 16 is a schematic cross-sectional view showing another example of the layer structure of the trunk of the paper container according to the present invention. FIG. 17A is a perspective view showing a conventional cup-shaped paper container. FIG. 17B is a schematic partial cross-sectional view of the paper container shown in FIG. FIG. 17C is a perspective view showing a state in which “burn” has occurred in the bottom sleeve portion. FIG. 17 (d) is a schematic partial sectional view of a conventional paper container having another shape.

The paper container according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of a paper container (1) according to the present invention. 2A is a schematic cross-sectional view showing the AA ′ cross section of the paper container (1) shown in FIG. 1, and FIG. 2B is a top view of the top surface portion (10). 2 (c) is a partial enlarged cross-sectional schematic view of the body (20). FIG. 3 is a perspective view showing a state in which contents are stored in the paper container (1) shown in FIG. 1 and heated in a microwave oven.
4 is a schematic plan view showing the top surface forming blank (10b) and the body forming blank (20b) of the paper container (1) shown in FIG.
This will be described below with reference to these drawings.

  A paper container (1) according to the present invention is formed from a body layer forming blank (20b) having a paper layer (2) and thermoplastic resin layers (3a) and (3b) provided on both sides of the paper layer. A cylindrical body (20); a paper layer (2) and thermoplastic resin layers (3a) and (3b) provided on both sides of the paper layer, and an opening above the body (20) And a bottom surface portion (30) for sealing an opening below the body portion (20).

  In the paper container (1) according to the present invention, the top surface part (10) has a peripheral edge part (11) bent upward, and the body part (20) is at both ends of the body part forming blank (20b). The upper part of the upper part (22c) formed by folding the upper end part (22) of the trunk part (20c) inwardly, and the upper part (22c) of the trunk part (20). 22a) and a flange portion (23f) formed by rolling the lower end portion (23) of the body portion (20) outward and then flattening it, and the peripheral portion (11) of the top surface portion (10). ) Is tightly sealed in a state where it is inserted into the upper folded portion (22a) of the body portion (20), and the flange portion (23f) and the bottom surface portion (30) are tightly sealed. And

In the paper container (1) according to the present invention, the bottom surface portion has a bottom surface portion formed on a flange portion (23f) formed by rolling the lower end portion (23) of the body portion (20) outward and then flattening it. Since (30) is tightly sealed, the bottom surface is planar. For this reason, when it heats with a microwave oven, a charring does not generate | occur | produce. Moreover, the suitability for a hot bender of a type that is placed on a hot plate and heated is also good.

  In addition, since at least the body (20) and the top surface (10) include the paper layer (2), there is heat insulation. For this reason, hands are not hot in handling during heating compared to metal cans and glass bottles. There are advantages. There is also an advantage that the contents are difficult to cool.

  In the embodiment shown in FIGS. 1-4, the area of a top surface part (10) is smaller than the area of a bottom face part (30). This means that it is excellent in stability as a container and does not fall easily. Moreover, since the area of the bottom surface is larger than the area of the top surface, the heating efficiency by the hot plate is good. Moreover, since the shape is a shape obtained by inverting a normal paper cup, it can be manufactured using a normal paper cup manufacturing apparatus.

  In the embodiment shown in FIGS. 1 to 4, the trunk (20) is provided with an opening band (24) formed by two perforation lines (24m) parallel to circulate around the trunk. Yes. The tip of the unsealing band (24) forms an unsealing tab (24t) separated from the body (20), and the paper container is drawn along the perforation line (24m) by pulling the unsealing tab (24t) by hand. (1) can be opened. The opening start part (24s) of the opening band (24) also serves as a steam release part (25) for discharging steam (27) generated when the package filled with the contents is cooked.

  The steam release part (25) may be formed by opening the opening start part (24s) by pulling up the opening tab (24t) by hand, but as shown in FIG. It is formed by the action of the release layer (26) applied to the part corresponding to the opening band (24) of the part bonding part (21c), and the pressure of steam generated when the package filled with the contents is cooked by heating. You may make it open.

  The release layer (26) may be formed on the surface side of the side end edge (21a) of the body portion forming blank (20b), or may be formed on the back side of the side end edge (21b). In the example of FIG. 4, it is formed on the surface side of the side edge (21a). Due to the presence of the release layer (26), when the side edges (21a) and (21b) of the body portion forming blank (20b) are overlapped and heat-sealed, the body portion bonded portion (21c) is peeled off. The sealing strength of the layer (26) is weakened, and the layer is peeled off and opened by the heat and pressure of steam generated during cooking, and the generated steam is released.

  The release layer (26) can be obtained by printing and forming a release varnish obtained by adding a liquid repellent such as silicone resin and silicone oil, a lubricant such as natural wax and polyethylene wax, etc. to normal surface printing ink.

  Due to the presence of the release layer (26), the paper container can be prevented from rupturing even when the vapor hole is inadvertently opened and the package is heated in a microwave oven.

  In the body forming blank (20b) shown in FIG. 4, the corner portions are doubled by bonding the side edges to each other, and are folded back or rolled up to overlap each other. In order to avoid this, notches may be provided in advance at each corner.

  FIG. 5 is a perspective view showing another embodiment of the paper container (1) according to the present invention. FIG. 6 is a schematic plan view showing the top surface forming blank (10b) and the body forming blank (20b) of the paper container (1) shown in FIG.

  In the embodiment shown in FIG. 5, two opening bands (24a) and (24b) are provided so as to circulate around the trunk (20) horizontally. Each of the opening bands (24a) and (24b) is formed by two parallel perforation lines (24m).

  The tips of the unsealing bands (24a) and (24b) form unsealing tabs (24t) separated from the body (20). The opening opening part (24s) of the upper opening band (24a) also serves as a steam release part (25) for discharging steam generated when the package filled with the contents is cooked.

  In FIG. 6, the vapor venting part is formed by a release layer (26) applied to a site corresponding to the opening band (24a) of the body part pasting part (21c).

  In the embodiment as shown in FIG. 5, since there are two opening bands (24) on the top and bottom, the contents are spilled or difficult to take out by opening according to the consumption of the contents in order from the top. It is easy to use.

  FIG. 7 is a perspective view showing another embodiment of the paper container (1) according to the present invention. FIG. 8 is a schematic plan view showing the top surface forming blank (10b) and the body forming blank (20b) of the paper container (1) shown in FIG.

  The embodiment shown in FIGS. 7 and 8 is characterized in that the opening band (24) is provided so as to go around the body (20) in a spiral shape. In this embodiment, the tear strip (24) is formed by two parallel half-cut lines (24h).

  If the unsealing band (24) is provided in this manner, the containers after the unsealing are connected to each other, so that no debris that dissipates is generated. In addition, it can be opened gradually as the contents are consumed, making it easy to use.

  It is optional whether the opening band (24) is formed by a perforated line or a half-cut line. The perforation line is generally formed by a die cutter using a blade. The half cut line is formed by a blade or by a laser device.

FIG. 9 is a perspective view showing another embodiment of the paper container (1) according to the present invention. FIG. 10 is a schematic cross-sectional view showing a BB ′ cross section of the paper container (1) shown in FIG.
In this embodiment, the top surface (10) has an opening (12) that is releasably sealed by a tab material (13), and the opening (12) heats the package filled with the contents. It also serves as a steam vent for discharging steam generated when cooking.

  In the embodiment shown in FIGS. 9 and 10, since the opening (12) is provided in the top surface (10) of the paper container (1), the opening is at the top of the container and is made of paper. In particular, when a container for storing drinks such as amazake or soup is used, it is not hot even if it is held by hand and can be easily poured into other containers. Also, unlike metal cans, it is also suitable for drinking with a mouth directly on the container. Moreover, since the opening serves as a steam vent for discharging steam generated when the package filled with the contents is cooked, it is also suitable for cooking with a microwave oven.

Although not shown in FIGS. 9 and 10, by applying a release layer to a portion corresponding to the opening start portion of the opening (12), the pressure of the steam generated when the package filled with the contents is cooked is cooked. Vapor vent holes can be opened automatically, eliminating the need to open the vapor vent holes, and even if the container is heated in a microwave oven without inadvertently creating the vapor vent holes, the container may burst. There is nothing to do.

  FIG. 11 is a perspective view showing an embodiment of the paper container (1) according to claim 10 of the present invention. FIG. 12 is a schematic cross-sectional view showing a C-C ′ cross section of the paper container (1) shown in FIG. 11. FIG. 13A is a schematic cross-sectional view showing a D-D ′ cross section of the paper container (1) shown in FIG. 11. Moreover, FIG.13 (b) is a partial expanded cross-section schematic diagram of the trunk | drum bonding part (21c) in Fig.13 (a). Moreover, FIG.13 (c) is a partial expanded cross-section schematic diagram of the top | upper surface part (10) in FIG.

  In the embodiment shown in FIGS. 11 to 13, the end faces of all the paper layers are covered with a thermoplastic resin, and the end faces of the paper are not exposed to the inside or the outside of the container. It is characterized by.

  That is, the top surface portion (10) has a peripheral edge portion (11) bent upward and an opening portion (12) that is releasably sealed by the tab material (13), as shown in FIG. 13 (c). Thus, the end surface (12e) of the paper layer of the opening (12) is covered with the thermoplastic resin layers (3a) and (3b) provided on both surfaces of the paper layer (2). The opening (12) also serves as a steam vent for discharging steam generated when the package filled with the contents is cooked.

  When it is assumed that the paper container (1) is subjected to retort sterilization, the presence of the steam vent (25) using a release layer (26) that automatically opens due to the steam pressure during cooking. Is not preferred.

  The body part (20) includes a body part bonding part (21c) in which both side edges (21a) and (21b) of the body part forming blank (20b) are overlapped and sealed, and an upper end part ( 22) an upper folded portion (22a) formed by folding the inner portion back, a lower folded portion (22b) formed by further folding the upper end portion (22) of the folded trunk portion, and a trunk portion And a flange portion (23f) formed by rolling the lower end portion (23) of (20) outward one and a half times or more and then flattening it.

  The peripheral portion (11) of the top surface portion (10) is inserted into the upper folded portion (22a) of the trunk portion (20), and the upper end portion (22), the lower folded portion (22b) of the trunk portion and the top surface portion. The peripheral edge portion (11) of the flange portion (11) is tightly sealed, and the flange portion (23f) and the bottom surface portion (30) are tightly sealed.

  As described above, in this embodiment, the end faces of all the paper layers are covered with the thermoplastic resin layer or are entrained, and the end faces of the paper are both inside and outside the container. Is not exposed, it is possible to perform retort sterilization after filling the contents.

  About the method of covering the end surface of the paper layer (2) with the thermoplastic resin layers (3a, 3b), a continuous sheet in which the end surface of the paper layer to be covered is exposed in advance by punching is prepared, and the front and back surfaces of the paper layer After the thermoplastic resin layer is sandwiched between the two, a punching process is performed again so that an extra thermoplastic resin layer is formed on the end surface portion of the paper layer, and then the extra thermoplastic resin layer is formed on the paper layer. The end surface can be covered by folding back and crimping to the end surface. An example of a method for covering the side edge (21e) of the paper layer of the body forming blank (20b) with the thermoplastic resin layers (3a, 3b) is shown in FIGS.

First, as shown in FIG. 14, after the long window (5) is punched out while aligning with the web (2w) of the printed base paper, the thermoplastic resin layers (3a, 3b) are provided on the entire front and back surfaces. The portion of the long window (5) is in a state where the thermoplastic resin layers (3a, 3b) on the front and back surfaces are bonded to each other.

  Next, the body forming blank (20b) is punched out. At this time, as shown in FIG. 15 (a), the protruding portions (3c, 3d) of the thermoplastic resin layer remain on both side edges of the blank. Punch out. Next, as shown in FIG. 15 (b), the protruding portion (3c) of the thermoplastic resin layer was folded back on the front side, and the protruding portion (3d) of the thermoplastic resin layer was folded back on the back side, and then thermocompression-bonded and folded. By forming the thermoplastic resin layer (3h), the paper layer side edges (21e) at both ends of the body forming blank are covered.

  In order to set the paper container (1) to the retort specification, it is preferable to insert the gas barrier layer (4) into the inner layer of the middle paper layer (2) having the layer structure as shown in FIG. As the gas barrier layer (4), it is preferable to use a material other than the metal foil, such as a gas barrier plastic film or an inorganic oxide vapor deposition film, on the premise of heating by a microwave oven.

  Even if the retort sterilization treatment is not performed and the frozen storage is performed, the paper container of this embodiment can be heated by immersing the whole in hot water.

The material used for the paper container according to the present invention will be described. The paper layer (2), other conventional cup base paper, white cardboard, coated cardboard, the basis weight of 160g ^{/ m 2} ~400g ^/ m 2 about paper ivory paper, etc. can be used.

  As the thermoplastic resin layers (3a, 3b), polyolefin resins are generally used. Specifically, low density polyethylene, medium density polyethylene, linear low density polyethylene, ethylene / vinyl acetate copolymer, Ethylene resins such as ethylene / α-olefin copolymers and ethylene-methacrylic acid resin copolymers, blend resins of polyethylene and polybutene, homopolypropylene, propylene / ethylene random copolymers, propylene / ethylene block copolymers Polypropylene resins such as propylene / α-olefin copolymers are used.

As a material used for the bottom surface portion (30), a strong synthetic resin film can be used in place of the paper layer in addition to the material in which the thermoplastic resin layer is combined with the front and back surfaces of the paper.
As an example of such a material, a synthetic resin film such as polypropylene (PP) resin, polyethylene terephthalate (PET) resin, ionomer resin, polyamide resin (nylon), etc. can be used alone or in combination. .

  Hereinafter, although the paper container concerning the present invention is explained based on an example, the paper container concerning the present invention is not limited to these.

After printing a pattern on the surface of a cup base paper having a basis weight of 260 g / m ² , a low-density polyethylene (LDPE) layer having a thickness of 30 μm was formed on the front and back surfaces using an extruder. This was punched out with a die to produce a top surface forming blank and a body forming blank as shown in FIG. At this time, the perforation line (24 m) was formed simultaneously with the punching. A release layer (26) was printed on the blank after punching.

  The obtained blank was formed into a cup shape by a cup forming machine, and a paper container body having a shape as seen in FIG. 1 was produced. Separately, as a member for the bottom surface, a laminate of a paper layer and a thermoplastic resin layer having the same configuration as that used for the container main body was punched into a circle and prepared.

  The paper container was turned upside down, placed on a normal cup filling line, the yakitori was stored, the bottom member was heat-sealed, and then stored frozen.

  When the package taken out of the freezer is heated as it is with a microwave oven, the release layer is automatically opened by the pressure of the steam generated inside to become a steam vent, so that the container does not rupture. There was no burning. Also, it could be used without any problems even with a hot bender heated by a hot plate.

  The structure of the laminated body was, in order from the inside, LDPE, 30 μm / 260 g cup base paper / silica vapor deposited PET, 12 μm / LDPE, 30 μm. A blank was created using this laminate, and a paper container having the structure shown in FIGS. In addition, as a bottom material, it was set as the structure which does not use paper of LDPE, 30 micrometers / silica vapor deposition PET, 12 micrometers / stretched nylon, 25 micrometers / LDPE, and 30 micrometers. The tab material was the same as the bottom material.

  The container was filled with potage soup and sterilized by retort. The obtained package could be stored at room temperature, and when used, it could be heated directly in a microwave oven after peeling the tab material and opening a vapor vent hole. The container did not rupture or burnt. Also, it could be used without any problems even with a hot bender heated by a hot plate.

DESCRIPTION OF SYMBOLS 1 ... Paper container 2 ... Paper layer 2w ... Base paper web 3a, 3b ... Thermoplastic resin layer 3c, 3d ... Extrusion part of thermoplastic resin layer 4 ... Gas barrier layer 5 .. long window 10 ... top surface portion 10b ... top surface portion forming blank 11 ... peripheral edge portion 12 ... opening portion 12e ... opening paper layer end surface 13 ... tab material 20 ... Body part 20b ... Body part forming part blanks 21a, 21b ... Side edge 21c ... Body part bonding part 21e ... Paper layer side edge 22 ... Upper end part 22a ... Upper part Folded part 22b ... Lower folded part 23 ... Lower end part 23f ... Flange parts 24, 24a, 24b ... Unsealing band 24m ... Perforation line 24h ... Half-cut line 24s ... Opening start Portion 24t ... Opening tab 25 ... Vapor vent 26 ... Peeling layer 27 Vapor 30 ... bottom portion 200 ... body member 230 ... flange portion 250 ... bottom sleeve 260 ... leg portion 300 ... bottom member 310 ... peripheral portion 400 ... burnt

Claims (6)

A tubular body formed from a body forming blank having a paper layer and a thermoplastic resin layer provided on both sides of the paper layer;
A top surface portion having a paper layer and a thermoplastic resin layer provided on both sides of the paper layer, and sealing an opening above the body portion;
A bottom surface portion for sealing an opening below the body portion;
A paper container comprising:
The top surface portion has a peripheral edge bent upward,
The body part is a body part bonding part in which both side edges of the body part forming blank are overlapped and sealed; and
An upper folded portion formed by folding the upper end of the body portion inward;
A flange portion formed by rolling the lower end portion of the body portion outside and then flatly crushing,
Have
The peripheral portion of the top surface portion is tightly sealed in a state of being inserted into the upper folded portion of the trunk portion,
Furthermore, the flange part and the bottom part are tightly sealed ,
The trunk portion has an opening band formed by two parallel perforation lines or two parallel half-cut lines, and the leading end of the opening band forms an opening tab separated from the trunk portion. The band opening start part serves as a function for opening to consume the contents and a steam vent for discharging steam generated when the package filled with the contents is cooked.
The steam vent is formed by a release layer applied to a portion corresponding to the unsealing band of the body pasting portion, and is opened by the pressure of steam generated when the package filled with contents is cooked. A paper container characterized by that.   The paper container according to claim 1, wherein an area of the top surface portion is smaller than an area of the bottom surface portion.   The paper container according to claim 1 or 2, wherein the bottom portion includes a paper layer and a thermoplastic resin layer provided on both sides of the paper layer. The paper container according to any one of claims 1 to 3, wherein at least one of the unsealing bands is provided so as to circulate around the body portion horizontally. The paper container according to any one of claims 1 to 3, wherein the opening band is provided so as to circulate around the body portion in a spiral shape. A tubular body formed from a body forming blank having a paper layer and a thermoplastic resin layer provided on both sides of the paper layer;
A top surface portion having a paper layer and a thermoplastic resin layer provided on both sides of the paper layer, and sealing an opening above the body portion;
A bottom surface portion for sealing an opening below the body portion;
A paper container comprising:
The top surface portion has a peripheral edge bent upward,
The body part is a body part bonding part in which both side edges of the body part forming blank are overlapped and sealed; and
An upper folded portion formed by folding the upper end of the body portion inward;
A flange portion formed by rolling the lower end portion of the body portion outside and then flatly crushing,
Have
The peripheral portion of the top surface portion is tightly sealed in a state of being inserted into the upper folded portion of the trunk portion,
Furthermore, the flange part and the bottom part are tightly sealed,
The top surface portion has an opening portion that is releasably sealed by a tab material, and the opening portion discharges steam generated when the packed package is cooked and cooked. Also serves as a steam vent
The steam vent is formed by a release layer applied to a portion corresponding to the opening start portion of the opening, and is opened by the pressure of steam generated when the package filled with the contents is cooked. paper container shall be the.

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