Rice with laminated paper pulp container and rice with laminated paper pulp container manufacturing method

Abstract

The present application provides a rice lamination paper pulp container and a manufacturing method thereof, which reduces the possibility of damaging rice when the rice is taken out from the storage recess of the container. The container body (14) has a plurality of body-side pulp protrusions (44) protruding toward the storage recess (12), the body-side lamination film (50) has a plurality of body-side lamination protrusions (52) with shapes following the surface shape of the body-side pulp protrusions (44), the body-side lamination protrusions (52) are arranged to only contact the rice on the top side, and the opening width of the groove (54) between adjacent body-side lamination protrusions (52) is smaller than the maximum width of the rice perpendicular to the length direction.

Description

TECHNICAL FIELD

[0001] The present application relates to a laminated pulp container for rice and a manufacturing method of a laminated pulp container for rice. BACKGROUND

[0002] Known is a laminated pulp container having a container main body of pulp molding containing a storage recess for storing food or the like, and a laminated film attached to the surface of the storage recess of the container main body (for example, Patent Document 1).

[0003] PRIOR ART DOCUMENTS

[0004] Patent Document 1: Japanese Patent Application Laid-Open No. 2007-30925 SUMMARY

[0005] PROBLEMS TO BE SOLVED BY THE INVENTION

[0006] In the case where the contents stored in the storage recess of the laminated pulp container is rice after cooking (cooked rice), it is preferable that, in terms of the cooked rice being eaten with good taste and appearance, the rice grains do not adhere to the surface of the storage recess, the rice grains are easily peeled from the surface of the storage recess, and the cooked rice is taken out from the storage recess without the rice grains being broken.

[0007] On the contrary, the laminated pulp container known in the past does not have sufficient performance, the rice grains are difficult to be peeled from the surface of the storage recess, and the rice grains are easily broken when the cooked rice is taken out from the storage recess.

[0008] The problem to be solved by the present application is to provide a laminated pulp container for rice in which the possibility of the rice being broken when the rice is taken out from the storage recess is small, and a manufacturing method of the laminated pulp container.

[0009] MEANS FOR SOLVING THE PROBLEMS

[0010] The laminated pulp container for rice of one embodiment of the present application has a container main body 14 of pulp molding containing a storage recess 12 for storing rice after cooking, and a main body side laminated film 50 attached to the surface of the storage recess, the container main body having a plurality of main body side pulp protrusions 44 protruding toward the storage recess, the main body side laminated film having a plurality of main body side laminated protrusions 52 having shapes following the surface shapes of the main body side pulp protrusions, the main body side laminated protrusions being provided so as to contact the rice only on the top side, and the opening width LI of a groove 54 existing between adjacent main body side laminated protrusions being smaller than the maximum width W of the rice perpendicular to the length direction.

[0011] According to this structure, the contact area of the rice grains with the surface of the housing recess in which the body-side laminated film is formed is reduced compared to the case where the surface of the housing recess is a flat surface without irregularities, the rice grains are less likely to adhere to the surface of the housing recess, and the rice is less likely to intrude into the grooves between the body-side laminated protrusions. Thus, the likelihood of the rice grains being broken when the rice is taken out of the housing recess is reduced.

[0012] In the above embodiment, it is more preferable that the plurality of body-side laminated protrusions are arranged in a twill weave pattern.

[0013] According to this structure, the rice grains are less likely to adhere to the surface of the housing recess.

[0014] In the above embodiment, it is more preferable that the twill weave pattern of the body-side laminated protrusions is arranged in a four-line twill weave pattern.

[0015] According to this structure, the rice grains are even less likely to adhere to the surface of the housing recess.

[0016] In the above embodiment, it is more preferable that the opening width of the grooves between the body-side laminated protrusions is 0.18 mm or more and 0.20 mm or less, and the plurality of body-side laminated protrusions are 50 mesh or more and 60 mesh or less.

[0017] According to this structure, the rice grains are even less likely to adhere to the surface of the housing recess.

[0018] In the above embodiment, it is more preferable that the container body has an opening portion 12A that opens toward the upper portion of the housing recess, the rice pulp container further has a pulp molded lid body 24 that is connected to the container body in a bendable manner so as to be capable of opening and closing the opening portion, and a lid body-side laminated film 60 that is attached to the surface of the lid body on the side of the housing recess in the state in which the lid body closes the opening portion, has a plurality of lid body-side pulp protrusions 46 that protrude toward the housing recess on the surface of the lid body on the side of the housing recess in the state in which the lid body closes the opening portion, and has a plurality of lid body-side laminated protrusions 62 that have shapes that follow the surface shapes of the lid body-side pulp protrusions and grooves 64 between adjacent lid body-side laminated protrusions that have opening widths that are sizes that promote the capture of water droplets on the surface of the lid body-side laminated film.

[0019] According to this structure, the capture of water droplets on the surface of the lid body-side laminated film is promoted, and the falling of water droplets onto the rice contained in the housing recess is suppressed.

[0020] In the above embodiment, it is more preferable that the plurality of lid body-side laminated protrusions are arranged in a twill weave pattern.

[0021] According to this structure, the water droplets are further effectively captured on the surface of the lid-side laminated film, and the water droplets are further effectively inhibited from falling onto the rice accommodated in the accommodation recess.

[0022] In the above embodiment, it is more preferable that the twill pattern of the lid-side laminated protruding portions be an arrangement formed of a four-line twill pattern.

[0023] According to this structure, the water droplets are further effectively captured on the surface of the lid-side laminated film, and the water droplets are further effectively inhibited from falling onto the rice accommodated in the accommodation recess.

[0024] In the above embodiment, it is more preferable that the opening width of the groove between the lid-side laminated protruding portions be 0.18 mm or more and 0.20 mm or less, and the plurality of lid-side laminated protruding portions be 50 mesh or more and 60 mesh or less.

[0025] According to this structure, the water droplets are further effectively captured on the surface of the lid-side laminated film, and the water droplets are further effectively inhibited from falling onto the rice accommodated in the accommodation recess.

[0026] The manufacturing method of the rice-use laminated pulp container of one embodiment of the present application is the manufacturing method of the rice-use laminated pulp container of the above-described embodiment, and has a molding step of molding the container main body by pulp molding, and a laminating step of adhering the main-body-side laminated film to the surface of the accommodation recess of the container main body molded by the molding step, the molding step being performed using a molding mold device 100 that defines a container main body molding chamber to which a pulp slurry is supplied for molding the container main body, and a pulp web 130 that is disposed along a face of the container main body molding chamber defined by the molding mold device 100 on a side of the face of the container main body molding chamber that molds at least the surface of the accommodation recess of the container main body, the main-body-side pulp protruding portion being molded by transfer of the shape of the pulp web in the molding step.

[0027] According to this method, the main-body-side pulp protruding portion is molded by transfer of the shape of the pulp web in the molding step of molding the container main body.

[0028] In the above embodiment, it is more preferable that the pulp web be formed of a twill fabric.

[0029] According to this method, the pulp web appropriately performs both the papermaking and the molding of the main-body-side pulp protruding portion that makes it difficult for the rice grains to adhere to the surface of the accommodation recess.

[0030] In the above embodiment, it is more preferable that the pulp web is formed of a four-thread twill fabric formed by a four-thread twill weaving method in which one longitudinal wire is passed over three transverse wires and then one transverse wire is passed.

[0031] According to this method, the pulp web is formed to take into account both proper papermaking and formation of the body-side pulp protrusions that make it difficult for the rice grains to adhere to the surface of the accommodation recess.

[0032] In the above embodiment, it is more preferable that the wire diameter of the longitudinal wire and the transverse wire is 0.18 mm or more and 0.2 mm or less, and the pulp web is 60 mesh or more and 50 mesh or less.

[0033] According to this method, the pulp web is formed to take into account both proper papermaking and formation of the body-side pulp protrusions that make it difficult for the rice grains to adhere to the surface of the accommodation recess.

[0034] Inventive Effects

[0035] The rice-use laminated pulp container according to the present application is less likely to damage the rice grains when taken out of the accommodation recess, and is preferable in terms of eating the rice with good taste and appearance. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a perspective view showing one embodiment of the rice-use laminated pulp container of the present application (perspective view before the laminated film is laminated).

[0037] Figure 2 is a longitudinal sectional view of the rice-use laminated pulp container of this embodiment.

[0038] Figure 3 is an enlarged view of the surface of the rice-use laminated pulp container of this embodiment.

[0039] Figure 4 is a sectional view showing one embodiment of a molding device used in the manufacturing method of the rice-use laminated pulp container.

[0040] Figure 5 is a sectional view showing one embodiment of a laminating device used in the manufacturing method of the rice-use laminated pulp container.

[0041] EXPLANATION OF REFERENCE NUMERALS

[0042] 10: rice-use laminated pulp container

[0043] 12: accommodation recess

[0044] 12A: opening portion

[0045] 14: container body

[0046] 16: housing recess forming portion

[0047] 18: ridge portion

[0048] 20: flange portion

[0049] 22: folding tab

[0050] 23: perforation line

[0051] 24: lid

[0052] 26: shallow bottom recess

[0053] 28: shallow bottom recess forming portion

[0054] 30: recessed portion

[0055] 32: flange portion

[0056] 34: extension tab

[0057] 36: perforation line

[0058] 38: slit

[0059] 40: bendable tab

[0060] 42: engagement tab

[0061] 44: body-side pulp protrusion

[0062] 46: lid-side pulp protrusion

[0063] 50: body-side laminated film

[0064] 52: body-side laminated protrusion

[0065] 54: groove

[0066] 60: lid-side laminated film

[0067] 62: lid-side laminated protrusion

[0068] 64: groove

[0069] 100: molding die device

[0070] 102: fixed mold

[0071] 102A: protrusion

[0072] 102B: protrusion

[0073] 104: cylinder device

[0074] 106: movable mold

[0075] 106A: recess

[0076] 106B: concave part

[0077] 108: Container Body Molding Chamber

[0078] 110: Cover Forming Chamber

[0079] 112: On / off valve

[0080] 114: Pulp Supply Channel

[0081] 116: On / off valve

[0082] 118: Hot air supply passage

[0083] 120: Dehydration pathway

[0084] 122: On / off valve

[0085] 124: Suction Pump

[0086] 130: Pulp-digging net

[0087] 130A: Longitudinal wire

[0088] 130B: Horizontal wire

[0089] 150: Lamination device

[0090] 152: Fixed mold

[0091] 154: Cylinder assembly

[0092] 156: Movable Model

[0093] 158: Attraction Pathway

[0094] 160: Suction Pump

[0095] 162: Roller assembly Detailed Implementation

[0096] Hereinafter, an embodiment of the laminated pulp container for rice and an embodiment of its manufacturing method according to the present invention will be described with reference to the accompanying drawings.

[0097] like Figure 1 and Figure 2 As shown, the laminated pulp container 10 for rice production in this embodiment has a container body 14 molded from pulp, which includes a receiving recess 12 for receiving cooked rice. The receiving recess 12 is a deep recess with a generally rectangular shape that opens upwards. The container body 14 has an opening 12A that opens upwards toward the receiving recess 12.

[0098] The container body 14 is integrally formed (molded) by the following: the recess forming part 16 that defines the recess 12, the rectangular frame-shaped protrusion 18 that extends along the outer edge of the recess 12 of the recess forming part 16, and the rectangular frame-shaped flat flange 20 that extends outward from the protrusion 18.

[0099] The container body 14 is connected to the pulp molded lid 24 by a rectangular flap 22 integrally formed along the flange 20 corresponding to one long side of the receiving recess 12. Perforated lines 23 are formed on the flap 22.

[0100] The cover 24 is integrally formed (molded) by a shallow bottom recess forming part 28 that defines a shallow bottom recess 26 with a generally rectangular shape, a rectangular frame-shaped recessed part 30 extending along the outer edge of the shallow bottom recess forming part 28, and a rectangular frame-shaped flat flange part 32 extending outward from the recessed part 30.

[0101] In order to close the opening 12A in a way that can be opened and closed, the cover 24 is connected to the container body 14 in a bendable manner by a perforated line 23.

[0102] like Figure 2 As shown, when the cover 24 is in the closed state (hereinafter referred to as the closed state), the concave strip 30 and the convex strip 18 fit together, and the flange 32 and the flange 20 are in surface contact, thereby creating a labyrinth-like sealing effect and sealing the storage recess 12.

[0103] An extension piece 34 is integrally formed on the container body 14, extending outward from the long side of the receiving recess forming part 16 on the side opposite to the folding blade 22 in the flange portion 20. A bendable piece 40 composed of perforated lines 36 and slits 38 is formed on the extension piece 34.

[0104] The cover 24 is integrally formed with a locking tab 42 extending outward from the long side of the shallow bottom recess forming part 28 on the side opposite to the folding blade 22 in the flange 32.

[0105] like Figure 2 As shown, when the cover 24 is in the closed state, the locking piece 42 is inserted into the slit 38, and the bendable piece 40 bends downwards, thereby locking onto the extension piece 34 and keeping the cover 24 in the closed state.

[0106] The container body 14 has a plurality of body-side pulp protrusions 44 protruding toward the receiving recess 12 (see reference). Figure 2 (A) A magnified view of a portion of the image.

[0107] The surface of the accommodation recess 12 formed by the accommodation recess forming portion 16 of the container body 14 and the surfaces of the ridge portion 18, the flange portion 20, the lid piece 22, and the extension piece 34 on the same side as the surface are adhered in close contact with the body-side laminated film 50 in accordance with the overall surface shape thereof by heat sealing or the like. That is, the body-side laminated film 50 is adhered in close contact on the entire surface of the container body 14 on the side of the surface of the accommodation recess 12.

[0108] As the resin film suitable for the body-side laminated film 50, a polypropylene film, a polyethylene terephthalate film, a polyethylene film, or the like having a thickness of about 100 to 200 μm can be cited.

[0109] The body-side laminated film 50 is adhered in close contact to the container body 14, whereby a plurality of body-side laminated protrusions 52 (see FIG. 6, which is a partial enlarged view A) having a shape in accordance with the surface shape of the body-side pulp protrusion 44 are formed. Figure 2

[0110] The body-side laminated protrusions 52 are an arrangement formed of a twill weave pattern, and more preferably, as shown in FIG. 7, an arrangement formed of a four-line twill weave pattern, and each body-side laminated protrusion 52 is provided so as to be in contact with the cooked rice grains R on the top side. Figure 3

[0111] Thus, compared with the case where the surface of the accommodation recess 12 is a flat surface without irregularities, the contact area of the rice grains R with the surface of the accommodation recess 12 is reduced, and the rice grains R are less likely to adhere to the surface of the accommodation recess 12. Thus, the possibility of the rice grains R being broken when the rice is taken out of the accommodation recess 12 is reduced.

[0112] A groove 54 is present between adjacent body-side laminated protrusions 52. The opening width LI (the minimum width) of the groove 54 is smaller than the maximum width W of the cooked rice grains R in a direction perpendicular to the length direction. Thus, the rice grains R are less likely to intrude into the groove 54. Thus, the rice grains R are also less likely to adhere to the surface of the accommodation recess 12, and the possibility of the rice grains R being broken when the rice is taken out of the accommodation recess 12 is reduced.

[0113] The opening width LI of the groove 54 is preferably 1 / 2 of the maximum width W, which is preferable in terms of the rice grains R being less likely to intrude into the groove 54, and can be 0.18 mm or more and 0.20 mm or less. Also, the plurality of body-side laminated protrusions 52 can be 50 mesh or more and 60 mesh or less.

[0114] The surface of the lid body 24 on the side of the accommodation recess 12 in the closed lid state has a plurality of lid-body-side pulp protrusions 46 that protrude toward the accommodation recess 12 in the closed lid state.

[0115] ​​The surface of the lid 24 on the side of the storage recess 12 in the closed lid state is adhered with the lid-side laminated film 60 in a close contact state by heat fusion or the like. In other words, the surface of the shallow bottom recess 26 formed by the shallow bottom recess forming portion 28 of the lid 24 and the surfaces of the recessed groove portion 30, the flange portion 32, and the engaging piece 42 on the same side as the surface are adhered with the lid-side laminated film 60 in a close contact state in accordance with the overall shape of these surfaces. That is, the lid-side laminated film 60 is adhered in a close contact state to the entire surface on the side of the surface of the shallow bottom recess 26 of the lid 24.

[0116] As the resin film suitable for the lid-side laminated film 60, a polypropylene film, a polyethylene terephthalate film, a polyethylene film, or the like having a thickness of about 100 to 200 μm can be given. The lid-side laminated film 60 is formed of the same resin film as the body-side laminated film 50 and can be integrated with the body-side laminated film 50.

[0117] The lid-side laminated film 60 is adhered to the lid 24 in a close contact state, and thereby has a plurality of lid-side laminated protrusions 62 (see Figure 2 , a partial enlarged view B) in accordance with the surface shape of the lid-side pulp protrusions 46.

[0118] The lid-side laminated protrusions 62 are arranged in the same herringbone pattern as the body-side laminated protrusions 52, and more preferably in a four-line herringbone pattern. The width of the groove 64 present between adjacent lid-side laminated protrusions 62 is a size that promotes the capture of water droplets on the surface of the lid-side laminated film 60 in the closed lid state. The width of the groove 64, that is, the opening width L2 of the groove 64 can be the same as the opening width LI of the groove 54, and can be 20.18 mm or more and 0.20 mm or less. Furthermore, the number of meshes of the plurality of lid-side laminated protrusions 62 can be the same as the number of meshes of the body-side laminated protrusions 52, and can be 50 meshes or more and 60 meshes or less.

[0119] As described above, by providing the plurality of lid-side laminated protrusions 62 on the surface of the shallow bottom recess 26, even if water vapor flowing from the rice condenses (dew condensation) on the surface of the shallow bottom recess 26 to produce water droplets D on the surface of the shallow bottom recess 26 in the closed lid state, the water droplets D are captured by the groove 64, and the water droplets D are difficult to fall onto the rice stored in the storage recess 12. Thus, the rice in the storage recess 12 is difficult to become wet.

[0120] Next, a manufacturing method of the rice laminated pulp container 10 will be described with reference to Figure 4 and Figure 5 .

[0121] The manufacturing method of the rice laminated pulp container 10 has a molding step of molding the body 20 and the lid 24 using a single piece of a resin film, a cutting step of cutting the body 20 and the lid 24, and a laminating step of laminating the body-side laminated film 50 and the lid-side laminated film 60. Figure 4The molding die device 100 and the pulp web 130 shown are used to mold the container body 14 and the lid 24 connected to the container body 14 by the flaps 22 by pulp molding, and a laminating process using Figure 5 The laminating device 150 shown is used to adhere a laminated film to the surfaces of the container body 14 and the lid 24 molded by the molding process.

[0122] As shown in Figure 4 The molding die device 100 has a fixed die (lower die) 102 and a movable die (upper die) 106 driven in the vertical direction by a cylinder device 104. The molding die device 100 includes a portion that defines a container body molding chamber 108 for molding the container body 14 by the fixed die 102 and the movable die 106 in cooperation with each other, and a lid molding chamber 110 for molding the lid 24. Figure 4 The portion of the molding die device 100 shown in the closed die state defines the container body molding chamber 108 for molding the container body 14 by the fixed die 102 and the movable die 106 in cooperation with each other, and the lid molding chamber 110 for molding the lid 24.

[0123] In the portion of the movable die 106 that defines the container body molding chamber 108 and the lid molding chamber 110, the fixed die 102 becomes protrusions 102A, 102B, and the movable die 106 becomes recesses 106A, 106B that receive the protrusions 102A, 102B.

[0124] The face of the container body molding chamber 108 along one side of the surface of the receiving recess 12 of the container body 14, and the face of the lid molding chamber 110 along one side of the surface of the shallow bottom recess 26 of the lid 24, that is, the entire surface of the fixed die 102 including the protrusions 102A, 102B of the fixed die 102, is provided with the pulp web 130 that performs the pulp molding of the pulp slurry.

[0125] The pulp web 130 is formed of twill fabric, and in order to perform the pulp molding of the pulp slurry that becomes the raw material of the container body 14 with less loss of the pulp slurry and with high efficiency and good quality, it is preferable that the pulp web 130 is formed of four-thread twill fabric obtained by repeating the following operation: as shown in the enlarged view of Figure 4 After one longitudinal wire 130A passes above three transverse wires 130B, another transverse wire 130B is made to pass. Also, in terms of good pulp molding, it is preferable that the wire diameter of the longitudinal wire 130A and the transverse wire 130B of the pulp web 130 is 0.18 mm or more and 0.2 mm or less, and the pulp web 130 is 60 mesh or more and 50 mesh or less.

[0126] On the movable mold 106, a paper pulp slurry supply passage 114 that supplies a turbid liquid of paper pulp slurry and water from a paper pulp slurry source (not shown) to the molding chamber including the container body molding chamber 108 and the lid molding chamber 110 via an on-off valve 112, and a hot air supply passage 118 that supplies hot air from a hot air source (not shown) to the molding chamber including the container body molding chamber 108 and the lid molding chamber 110 via an on-off valve 116 are formed.

[0127] On the fixed mold 102, a dewatering passage 120 that communicates with the molding chamber including the container body molding chamber 108 and the lid molding chamber 110 across the papermaking wire 130 is formed. The dewatering passage 120 is connected to a suction pump 124 via an on-off valve 122.

[0128] In the molding process, in the mold clamped state shown in FIG. 1, the on-off valve 112 is opened, and the turbid liquid of paper pulp slurry and water is supplied from the paper pulp slurry supply passage 114 to the molding chamber including the container body molding chamber 108 and the lid molding chamber 110. By operating the suction pump 124 by opening the on-off valve 122 while the turbid liquid is being supplied, the water in the turbid liquid is discharged from the dewatering passage 120 to the outside of the molding chamber through the papermaking wire 130. Figure 4 The on-off valve 112 is closed, and the supply of the turbid liquid to the molding chamber is stopped. Thereafter, the on-off valve 116 is opened, and hot air is supplied to the molding chamber, and the drying of the paper pulp slurry in the molding chamber is performed.

[0129] If a prescribed amount of the turbid liquid is supplied to the molding chamber, the on-off valve 112 is closed, and the supply of the turbid liquid to the molding chamber is stopped. Thereafter, the on-off valve 116 is opened, and hot air is supplied to the molding chamber, and the drying of the paper pulp slurry in the molding chamber is performed.

[0130] If the drying of the paper pulp slurry is completed, the on-off valve 116 is closed, and the supply of hot air to the molding chamber is stopped. Thereafter, the movable mold 106 is moved upward by the cylinder device 104, and the mold is opened, and the paper pulp molded product including the container body 14 and the lid 24 is taken out from the fixed mold 102.

[0131] The surface of the accommodation recess 12 of the container body 14 is transferred with the shape of the papermaking wire 130, and the plurality of body-side paper pulp protrusions 44 are molded. In addition, the surface of the shallow bottom recess 26 of the lid 24 is transferred with the shape of the papermaking wire 130, and the plurality of lid-side paper pulp protrusions 46 are molded. The papermaking wire 130 for molding the container body 14 is the same as the papermaking wire 130 for molding the lid 24, and thus the body-side paper pulp protrusions 44 are the same as the lid-side paper pulp protrusions 46.

[0132] Since the papermaking wire 130 is formed of the four-thread twill fabric having the above-described characteristics, the body-side paper pulp protrusions 44 that are naturally molded by the papermaking, that is, by the transfer of the papermaking wire 130, are favorable in that the rice grains R are less likely to adhere to the surface of the accommodation recess 12. In this way, the papermaking wire 130 balances the appropriate papermaking and the molding of the body-side paper pulp protrusions 44 that make it difficult for the rice grains to adhere to the surface of the accommodation recess 12.

[0133] In addition, since the pulp web 130 is formed of the four-thread twill fabric having the above-described characteristics, the lid-side pulp protrusions 46 that are naturally formed by the papermaking, that is, by the transfer through the pulp web 130, easily capture the water droplets D on the surface of the shallow bottom recesses 26. In this way, the pulp web 130 balances appropriate papermaking and the formation of the lid-side pulp protrusions 46 that easily capture the water droplets D on the surface of the shallow bottom recesses 26.

[0134] As shown in FIG. 1, the molding die device 100 has a fixed die (lower die) 102 and a movable die (upper die) 106 that is driven in the vertical direction by a cylinder device 104. The fixed die 102 and the movable die 106 have die surfaces that have the same shape as the container body 14 and the lid 24, and in the open die state shown in FIG. 2, a pulp molded product that includes the container body 14 and the lid 24 is placed on the fixed die 102. The fixed die 102 is formed with suction passages 108 that open toward the die surface. A suction pump 110 is connected to the suction passages 108. Figure 5 Figure 5 As shown in FIG. 3, the molding die device 100 has a fixed die (lower die) 102 and a movable die (upper die) 106 that is driven in the vertical direction by a cylinder device 104. The fixed die 102 and the movable die 106 have die surfaces that have the same shape as the container body 14 and the lid 24, and in the open die state shown in FIG. 2, a pulp molded product that includes the container body 14 and the lid 24 is placed on the fixed die 102. The fixed die 102 is formed with suction passages 108 that open toward the die surface. A suction pump 110 is connected to the suction passages 108.

[0135] In the open die state, the belt-shaped film F (raw material of the body-side laminated film 50 and the lid-side laminated film 60) that is conveyed by a roller device 162 is passed between the fixed die 102 and the movable die 106 in a state in which a predetermined tension is applied, the movable die 106 is moved downward by the cylinder device 104, and the dies are closed. In this state, the film F is brought into close contact with the pulp molded product on the fixed die 102 by suction by the suction pump 110. Thereafter, the surface of the pulp molded product that is in close contact with the film F is adhered by heat fusion or the like.

[0136] After the adhering is completed, the movable die 106 is moved upward by the cylinder device 104, the dies are opened, the film F is cut, and the pulp molded product to which the body-side laminated film 50 and the lid-side laminated film 60 based on the film F are adhered is taken out from the fixed die 102. Thus, the rice-use laminated pulp container 10 is completed.

[0137] The body-side laminated film 50 and the lid-side laminated film 60 are thin films of about 100 to 200 μm, and therefore the body-side pulp protrusions 44 and the body-side laminated protrusions 52 are substantially the same, and the lid-side pulp protrusions 46 and the lid-side laminated protrusions 62 are substantially the same.

[0138] ​Thus, the body-side laminated protrusion 52 functions to make it difficult for the rice grains R to adhere to the surface of the accommodation recess 12, and the lid-side laminated protrusion 62 functions to make it easy to capture the water droplets D on the surface of the shallow-bottomed recess 26. The surface of the body-side laminated protrusion 52 is composed of the body-side laminated film 50, and thus is smoother than the surface of the pulp-molded raw material, and thus it is also difficult for the rice grains R to adhere to the surface of the accommodation recess 12. Also, since the surface of the lid-side laminated protrusion 62 is composed of the lid-side laminated film 60, the surface tension is higher than that of the surface of the pulp-molded raw material, and thus it is also difficult for the rice grains R to adhere to the surface of the accommodation recess 12.

[0139] The above describes the preferred embodiments of the present application, but those skilled in the art will readily understand that the present application is not limited to such embodiments, and can be appropriately changed without departing from the gist of the present application.

[0140] For example, by making the pulp molding net 130 of the papermaking container body 14 and the pulp molding net 130 of the papermaking lid 24 different from each other, the body-side pulp protrusion 44 and the lid-side pulp protrusion 46 can be made different from each other. The rice-use laminated pulp container 10 can also not have the lid 24, and can be only the accommodation recess 12. The laminating of the resin film can also be performed on the container surface of the rice-use laminated pulp container 10 on the side opposite to the surface of the accommodation recess 12.

[0141] Also, the constituent elements shown in the above-described embodiments are not necessarily all essential, and can be appropriately selected and omitted without departing from the gist of the present application.

Claims

1. A rice-use laminated pulp container, having: a container main body molded by pulp, including a storage recess for storing cooked rice; and a main body-side laminated film attached to a surface of the storage recess, the container main body having a plurality of main body-side pulp protrusions protruding toward the storage recess, the main body-side laminated film having a plurality of main body-side laminated protrusions whose shapes follow a surface shape of the main body-side pulp protrusions, the main body-side pulp protrusions having an arrangement of a twill fabric pattern as a pulp screen transfer pattern, the main body-side laminated protrusions being arranged to contact the rice only on a top side, having an arrangement formed by the twill fabric pattern as the pulp screen transfer pattern, an opening width of a groove present between adjacent main body-side laminated protrusions being smaller than a maximum width of the rice perpendicular to a length direction, the opening width of the groove between the main body-side laminated protrusions being 0.18 mm or more and 0.20 mm or less, and the plurality of main body-side laminated protrusions being 50 mesh or more and 60 mesh or less.

2. The rice-use laminated pulp container according to claim 1, wherein the twill fabric pattern is an arrangement formed by a four-line twill fabric pattern.

3. The rice-use laminated pulp container according to claim 1 or 2, wherein the container main body has an opening portion opening upward toward the storage recess, the rice-use laminated pulp container further having: a lid body molded by pulp, which is bendably connected to the container main body so as to close the opening portion in an openable and closable manner; and a lid body-side laminated film attached to a surface of the lid body on a storage recess side in a state in which the lid body closes the opening portion, the surface of the lid body on the storage recess side in the state in which the lid body closes the opening portion having a plurality of lid body-side pulp protrusions protruding toward the storage recess, the lid body-side laminated film having a plurality of lid body-side laminated protrusions whose shapes follow a surface shape of the lid body-side pulp protrusions, an opening width of a groove present between adjacent lid body-side laminated protrusions being a size that promotes capturing of water droplets on a surface of the lid body-side laminated film.

4. The rice-use laminated pulp container according to claim 3, wherein the plurality of lid body-side laminated protrusions are an arrangement formed by a twill fabric pattern.

5. The rice-use laminated pulp container according to claim 4, wherein the twill fabric pattern of the lid body-side laminated protrusions is an arrangement formed by a four-line twill fabric pattern.

6. The rice-use laminated pulp container according to claim 5, wherein the opening width of the groove between the lid body-side laminated protrusions is 0.18 mm or more and 0.20 mm or less, and the plurality of lid body-side laminated protrusions are 50 mesh or more and 60 mesh or less.

7. A manufacturing method of a rice-use laminated pulp container, which is the manufacturing method of the rice-use laminated pulp container according to claim 1, the manufacturing method having: a molding step of molding the container main body by pulp molding; and ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ a laminating step of attaching the main body side laminated film to a surface of the accommodation recess of the container main body formed by the forming step, the forming step is performed using a forming mold device that defines a container main body forming chamber to which a paper pulp slurry is supplied for forming the container main body, and a pulp screen that is provided along a face of the container main body forming chamber on at least one side of the face of the container main body forming chamber that forms the surface of the accommodation recess of the container main body, the main body side pulp protrusion is formed by transfer of the shape of the pulp screen in the forming step.

8. The manufacturing method of a laminated paper pulp container for rice according to claim 7, wherein the pulp screen is formed of a twill fabric.

9. The manufacturing method of a laminated paper pulp container for rice according to claim 8, wherein the pulp screen is formed of a four-thread twill fabric that is formed using a four-thread twill weaving method in which one longitudinal thread is passed over three horizontal threads and then one horizontal thread is passed.

10. The manufacturing method of a laminated paper pulp container for rice according to claim 9, wherein a thread diameter of the longitudinal thread and the horizontal thread is 0.18 mm or more and 0.2 mm or less, the pulp screen is 60 mesh or more and 50 mesh or less.

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