JP3995422B2 - container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a container having a flange portion on a peripheral wall portion of an opening and a manufacturing method thereof, and more particularly, to a container suitable for housing food and drink and a manufacturing method thereof.
[0002]
[Prior art and problems to be solved by the invention]
For example, a double container described in Japanese Utility Model Publication No. 3-38089 is known as a conventional technique related to a paper container having a flange portion on a peripheral wall portion of an opening. This double container consists of a plastic bottomed cylindrical inner container and a bottomed cylindrical outer container made of a single piece of paper or a laminate of paper and plastics. On the outer peripheral surface of the outer container is formed a fitting recess recessed inward, while the opening end of the outer container is curled inward to form a fitting protrusion protruding inward, and the inner container is placed in the outer container. When arranged, the fitting concave portion and the fitting convex portion are fitted together and formed integrally.
[0003]
By the way, since the internal diameter of the opening part of the above-mentioned double container is narrowed by the fitting recessed part of the inner container, when stacking a container, a loss arises and it was inferior in stacking property. In addition, when taking out the contents contained in the double container, the contents easily stay in the container due to the fitting concave portion of the inner container, which is difficult to use.
[0004]
Accordingly, an object of the present invention is to provide an easy-to-use container that is excellent in stacking property and does not interfere with the removal of the contents, and a method for manufacturing the same.
[0005]
[Means for Solving the Problems]
The present invention is a container having a curled flange portion formed by winding a peripheral wall portion of an opening portion of a papermaking container inward, and the inner portion of the flange portion is located above an inner peripheral surface of the papermaking container. The object is achieved by providing a container located on the extended surface or on the outside of the upper extended surface.
[0006]
Further, the present invention pre-forms a paper making container having an overhanging portion projecting outward from the opening and a peripheral wall portion rising from the peripheral edge portion of the overhanging portion, and then winding the peripheral wall portion inwardly so that the inner portion is the The object is achieved by providing a manufacturing method of a container that forms a curled flange portion located on an upper extending surface of the inner peripheral surface of the papermaking container or on the outer side of the upper extending surface.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below based on preferred embodiments with reference to the drawings.
FIG. 1 shows a container for instant cup noodles according to an embodiment of the container of the present invention. In the same figure, the code | symbol 1 has shown the container.
[0008]
As shown in FIG. 1, the container 1 is formed with a curled flange portion 22 formed by winding the peripheral wall portion 21 of the opening 20 of the papermaking container 2 inside.
In the container 1, the resin layer 3 that covers the inner peripheral surface 23 and the flange portion 22 of the papermaking container 2 is formed of a film.
[0009]
As shown in FIG. 2, the inner portion 22 a of the flange portion 22 is located outside the upper extending surface 23 a of the inner peripheral surface 23 of the papermaking container 2.
[0010]
As will be described later, the flange portion 22 is formed by winding the peripheral wall portion 21 rising from the peripheral edge portion of the overhang portion 24 in the opening portion 20 of the papermaking container 2. In the present specification, the curled shape means a state in which the end portion of the peripheral wall portion 21 is wound inward so as to form a closed space or a substantially closed space, and the peripheral wall portion 21 simply extends upward or inward. In this state, the state in which the end portion is not wound inside so as to form a closed space or a substantially closed space is not included.
[0011]
The inclination angle θ (angle formed with the opening edge E) of the overhanging portion 24 is 0 to 15 degrees in terms of facilitating the installation of the papermaking container 2 on the processing jig in the bending process after the papermaking of the flange portion 22. It is preferable that it is 5 to 10 degrees.
[0012]
The overhang width of the flange portion 22 (the length from the 24 bent portions of the overhang portion to the outermost end portion of the flange portion 22) W should be set to an appropriate length according to the use and form of the container to be formed. However, the strength of the opening 20, the sealing performance when sealing the lid material to the flange portion 22 (peeling strength of the lid material), the good mouth feel of the flange portion when eating and drinking the contents, the flange around the peripheral wall portion In terms of prevention of wrinkles when forming the part and workability, the thickness is preferably 2 to 5 mm, and more preferably 2.5 to 4 mm.
Similarly, the thickness of the flange portion 22 (height from the lower end portion to the upper end portion of the flange portion 22) can be set to an appropriate length and height depending on the use, shape, etc. of the container to be formed. However, in the process of sealing the lid material to the strength of the opening 20 and the flange part, resistance (proof strength) to the pressure received when the lid material is put on the rounded flange part, the flange part when eating and drinking the contents In terms of good mouthfeel, it is preferably 2 to 5 mm, and more preferably 2.5 to 4 mm.
[0013]
The papermaking container 2 is composed of a pulp layer made mainly from pulp. The density of the pulp layer includes surface smoothness, surface strength, compressive strength, waterproofness, shape retention, prevention of paper dust generation during stacking, and cushioning when filling the contents or stacking containers. in is preferably 0.4 to 1.5 g / cm ^3, more preferably 0.6~1.1g / cm ^3.
[0014]
In addition, the thickness of the paper making container (hereinafter referred to as the thickness means the thickness after drying) from the viewpoints of stability during paper making, shape retention, thin and light weight, compression strength, paper making or shortening drying time. .) Is preferably 0.5 to 2.0 mm, more preferably 0.5 to 1.0 mm. Further, from the viewpoint of facilitating the winding of the upper end portion 20 of the papermaking container 2 and the formation of the flange portion, the thickness of the peripheral wall portion 21 in the papermaking container 2 can be formed thin. The thickness is preferably 0.5 to 1.5 mm, and more preferably 0.5 to 0.7 mm.
[0015]
The surface smoothness of the inner surface 25 portion of the papermaking container 2 is the centerline average roughness Ra and the maximum height measured by the method described later in terms of adhesion to the resin film described later, prevention of pinhole generation of the resin film, and the like. At Rmax, Ra is 100 to 500 μm (value measured in accordance with JIS B 0601. The same applies hereinafter), and Rmax is 250 μm or less (value measured in accordance with JIS B 0601. The same applies hereinafter). It is preferable that Ra is 100 to 250 μm, and Rmax is 200 μm or less.
[0016]
Further, the surface smoothness of the outer surface portion of the papermaking container 2 is such that Ra is 1 to 15 μm at the center line average roughness Ra and the maximum height Rmax measured by the method described later in terms of improving printability. Rmax is preferably 15 μm or less, Ra is preferably 5 to 15 μm, and Rmax is preferably 10 μm or less.
[0017]
The paper making container 2 is made mainly of pulp, and may be made only of pulp fibers. In addition, the pulp fibers include inorganic substances such as talc and kaolinite, inorganic fibers such as glass fibers and carbon fibers, and polyolefins. Other components such as powders or fibers of thermoplastic synthetic resins such as non-wood or vegetable fibers and polysaccharides may also be included. The blending amount of these other components is preferably 1 to 70% by weight, particularly 5 to 50% by weight, based on the total amount of pulp fibers and other components. The pulp layer may contain a fiber dispersant, a forming aid, a coloring pigment, a coloring aid, and the like that are appropriately added at the time of papermaking.
[0018]
The resin layer 3 is a layer for imparting water resistance (leakage resistance), gas barrier properties and the like to the container 1. Accordingly, the resin used for the resin layer 3 is not particularly limited in its material, thickness, formation method and the like as long as it can provide the function. For example, polyolefin resins such as polyethylene and polypropylene, polyethylene terephthalate, etc. A so-called skin pack production method using a polyester resin such as nylon, a polyamide resin such as nylon, a polyvinyl resin such as polyvinyl chloride, or a thermoplastic resin film such as styrene resin such as polystyrene is preferably used. The resin layer 3 may have a single layer or multilayer structure.
[0019]
Next, a preferred embodiment of the method for manufacturing a container of the present invention will be described based on the method for manufacturing the container 1 with reference to the drawings.
[0020]
First, a papermaking container 2 having a bottomed cylindrical shape and a projecting portion 24 projecting outward from the opening 20 and a peripheral wall portion 21 rising from the peripheral portion of the projecting portion 24 is formed in advance (see FIG. 3A). .
[0021]
When the peripheral wall 21 of the papermaking container 2 presses the jig 13 described later against the peripheral wall 21 and winds the peripheral wall 21 inward along the concave portion 130, the winding start position of the peripheral wall 21 in the concave portion 130. Are formed so as to stand up in a direction parallel to the pressing direction by the jig 13 from the viewpoint that the inner wall of the peripheral wall portion 21 can be smoothly wound and can be smoothly wound. From this point, it is preferable to form it so as to stand substantially vertically or vertically.
[0022]
As shown in FIGS. 3A and 3B, the papermaking container 2 can be formed using a set of production molds including a male mold 11 and a female mold 12.
[0023]
The male mold 11 includes, for example, a paper making part 111 having a plurality of gas-liquid flow passages 110 that protrude downward and have a desired shape on the outer surface and communicate with the outside and the inside, and a predetermined covering for the paper making part 111 A net provided with a net (not shown) having an opening and a wire diameter is used.
[0024]
The gas-liquid passage 110 is 1 per 1 cm ^{2 on} the outer surface of the paper making part 111 in terms of dewatering efficiency and sufficient strength of the paper making part 111 when the paper making part 111 is elastically deformed to press the paper making container 2. It is preferable that ~ 4, especially 1-2 are formed.
[0025]
When the male mold 11 is inserted into the recess of the female mold 12, the fibers of the papermaking container 2 already made on the net surface of the male mold 111 are not scraped off from the concave of the female mold 12. It is preferable to have a slim shape, and the paper making section 111 is elastically deformed by pressing the male mold 11 after the paper making section 111 of the male mold 11 comes into contact with the bottom surface of the recess of the female mold 12, so that the paper making container 2 is It is preferable that it can be pressed.
The paper making part 111 of the male mold 11 is a material that can be elastically deformed and is made of a material having heat resistance and corrosion resistance. Examples of such a material include rubber materials such as silicone rubber, flexible rubber, and urethane rubber.
By using the male mold 11 provided with the papermaking section 111 having such a form, papermaking with high transfer accuracy can be achieved even when a molded body having a complicated surface shape or a deep drawn portion such as the papermaking container 2 is formed. Containers can be manufactured.
[0026]
The net is disposed so that at least the outer peripheral surface and the bottom surface forming the outer surface of the papermaking section 111 are covered and adhered along the surface shape. The net is formed from a stretchable material. Such materials include natural materials such as plant fibers and animal fibers, synthetic resins such as recycled resins, semi-synthetic resins, thermoplastic resins and thermosetting resins, or metals. The net may be composed of either a single layer or multiple layers. When the net is composed of a single layer, the net has an average aperture area ratio of 10 to 80%, particularly 20 to 40% in a state where the net is tightly coated on the outer surface of the papermaking section 111. Is preferable from the viewpoint of water absorption, breathability and strength. When the net is composed of multiple layers, for example, the net is composed of a first net and a second net that is finer than the first net, and the first net is brought into close contact with the outer surface of the accommodating portion 111. It is preferable to cover the second net on the first net. Alternatively, it is preferable to cover the first net with the outer surface of the paper making unit 111 and to form the second net integrally on the first net. By constructing the net from multiple layers, the number of gas-liquid flow passages formed in the papermaking part can be reduced, the strength of the papermaking part can be secured, and the pulp layer can be formed on the net with a uniform thickness. be able to.
[0027]
On the other hand, the female die 12 corresponds to the outer shape of the paper making container made on the surface of the net of the male die 11 and has an inner diameter larger than the outer diameter of the paper making portion 111 and shallower than the height of the paper making portion 111. A metal mold having a concave portion 120 is used. Moreover, it is preferable to use the female die 12 provided with a heating means (not shown) from the viewpoint that drying can be performed in addition to dehydration.
[0028]
As shown in FIG. 3A, the papermaking container 2 immerses the male mold 11 in a pool P containing the slurry S for the papermaking container 2, and then sucks moisture in the slurry S through the gas-liquid flow passage 110. Then, paper is made in a wet state on the outer surface of the net of the male mold 11 by making a solid (pulp fiber or the like) with the net (not shown).
[0029]
The slurry used for papermaking of the papermaking container 2 is preferably made of only pulp fibers and water. In addition to pulp fibers and water, inorganic substances such as talc and kaolinite, inorganic fibers such as glass fibers and carbon fibers, thermoplastic synthetic resin powders or fibers such as polyolefins, non-wood or vegetable fibers, polysaccharides, etc. It may contain components. The blending amount of these components is preferably 1 to 70% by weight, particularly 5 to 50% by weight, based on the total amount of pulp fibers and the components. In addition, a pulp fiber dispersant, a molding aid, a coloring agent, a coloring aid, and the like can be appropriately added to the slurry. Moreover, a sizing agent, a pigment, a fixing agent and the like can be appropriately added to the slurry.
[0030]
The papermaking container 2 is preferably dried in advance and densified before forming the flange portion 22. Specifically, after papermaking for a predetermined time, the male mold 11 is pulled up from the slurry and abutted against a metal female mold 12 corresponding to the male mold 11 as shown in FIG.
When the male mold 11 is inserted into the female mold 12, the bottom of the papermaking container 2 is first brought into contact with the bottom surface of the recess 120 of the female mold 12. Next, the male mold 11 is pressed with a predetermined pressure by a predetermined pressing means. By this pressing, the male die 11 is pressed and deformed so as to follow the shape of the concave portion 120 of the female die 12 and expands to completely fill the space of the concave portion 120. As a result, the papermaking container 2 formed on the surface of the papermaking section 111 is further dehydrated under pressure, and the inner shape of the recess 120 is transferred to the papermaking container 2. In this case, since the paper-making part 111 is formed in a taper shape whose side face tapers downward, when the paper-making part 111 is pressed, the pressure spreads evenly to every corner, and the female mold 12 The shape of the inner surface of the recess 120 is more faithfully transferred to the papermaking container 2.
[0031]
Then, the female mold 12 is further heated by its heating means (not shown), and the papermaking container 2 is dried and densified. It is preferable to use a female mold 12 that does not have an exhaust hole on the inner surface so as not to leave behind on the outer surface of the papermaking container 2, but it has an exhaust hole when desiring to shorten the drying time. Can also be used.
[0032]
When the papermaking container 2 is dehydrated and dried, moisture (water and steam) in the papermaking container 2 is sucked through the gas-liquid passage 110 of the male mold 11 and drained outside. The pressing force during dehydration / drying of the paper making container 2 is preferably 0.5 to 3.0 MPa, and preferably 1.5 to 2.2 MPa from the viewpoint of increasing the density by increasing the dewatering efficiency. More preferred. In addition, the mold temperature (temperature of the female mold 12) during drying of the papermaking container 2 is preferably 130 to 240 ° C, and preferably 150 to 200 ° C in terms of prevention of scorching due to drying, drying efficiency, and the like. Is more preferable.
[0033]
When the papermaking container 2 is dried to a predetermined moisture content, the heating and drying are finished. Then, after the papermaking container 2 is dehydrated and dried, the papermaking container 2 is moved from the male mold 11 and the female mold 12 to the jig 13 for forming the flange portion 22 as shown in FIG. Move into the jig 14. During the movement, the paper making container 2 is sucked by negative pressure through the gas-liquid passage 110 of the male mold 11 and adsorbed to the paper making section 111, detached from the female mold 12 and stored in the female jig 14. The paper making container 2 is stored in the female jig 14 by purging the compressed air through the male mold 11 and removing it from the male mold 11.
[0034]
Next, the peripheral wall portion 21 of the formed papermaking container 2 in the wet state is wound inside, and the inner portion 22a of the flange portion 22 is positioned outside the upper extending surface 23a of the inner peripheral surface 23 of the papermaking container 2. Part 22 is formed.
[0035]
In forming the flange portion 22, as shown in FIG. 4A, the metal jig 13 having the concave portion 130 that curves in accordance with the form of the flange portion 22 to be formed and the overhang portion 24 are moved downward. A female jig 14 having a supporting surface portion 140 to be supported is used.
[0036]
Then, the jig 13 is lowered from above the papermaking container 2 accommodated in the female jig 14, and the peripheral wall portion 21 is wound inside along the concave portion 130. Then, these jigs are abutted against each other as shown in FIG. 4 (b), and the flange 22 is located on the outer side of the upper extending surface 23 a of the inner peripheral surface 23 of the papermaking container 2. Form. After the flange portion 22 is formed, the container (semi-finished product) formed by opening the jig 13 and the female jig 14 is removed.
[0037]
Next, the resin layer 3 is formed. The resin layer 3 is formed so as to cover the inner surface 25 and the flange portion 22 of the papermaking container 2. The resin layer 3 can be formed by a conventional method such as vacuum forming. In the case of vacuum forming, a vacuum forming die (not shown) having a vacuum suction path and a band heater having substantially the same dimensions as the female die (see FIG. 3B) used in the dewatering / drying process of the papermaking container 2. ), A semi-finished papermaking container 2 is set in the vacuum mold, and a resin film is set so as to close the opening of the papermaking container 2. Then, a plug (not shown) provided with a heater is brought into contact with the resin film from above to soften the resin film and butt against the vacuum forming die, while utilizing the air permeability of the papermaking container 2. The container is evacuated through the vacuum suction path, and the resin film is brought into close contact with the surface of the pulp layer. Then, predetermined trimming is performed to complete the manufacture of the container.
[0038]
As described above, in the container 1 of the present embodiment, the peripheral wall portion 21 of the opening 20 of the papermaking container 2 is wound inside to form the curled flange portion 22, and the inner portion 22 a is formed of the papermaking container 2. Since the inner peripheral surface 23 is located outside the upper extending surface 23a, the stacking property is excellent, and there is no hindrance to taking out the contents.
[0039]
Further, since the peripheral wall portion 21 of the opening 20 of the papermaking container 2 is wound inwardly, unlike paperboard, even in the case of a papermaking container having no orientation of pulp fibers, the occurrence of breakage, wrinkles, etc. is caused when the flange portion 22 is formed. Can be suppressed. Moreover, since the flange part 22 is curving and the edge part of the opening part 20 of the papermaking container 2 is not exposed, the mouthfeel and the external appearance are also favorable, and the intensity | strength is enough.
[0040]
Moreover, since the container 1 of this embodiment has a smooth surface of the papermaking container 2 and no joints on the inner surface and the outer surface, the printability is good and the adhesion of the resin film is also good. .
[0041]
The present invention is not limited to the above-described embodiment, and can be changed without departing from the spirit of the present invention.
[0042]
For example, it is preferable to form the flange portion 22 so that the inner portion 22a of the flange portion 22 is located outside the upper extending surface 23a of the inner peripheral surface 23 of the papermaking container 2, as in the container 1 of the above embodiment. However, the flange part 22 can also be formed so that the inner part 22a is located on the upper extending surface 23a.
[0043]
Further, as shown in FIG. 5 (a), a papermaking container 2 ′ having a projecting portion 24 ′ projecting horizontally from the opening and a peripheral wall portion 21 ′ standing up from the peripheral portion of the projecting portion 24 ′ is formed in advance. The paper making container 2 ′ in which the flange portion 22 ′ is formed such that the portion 21 ′ is wound inward as shown in FIG. 5B and the inner portion 22a ′ is positioned on (or outside) the upper extending surface 23a ′. Can also be used.
[0044]
In addition, the resin layer is preferably formed of a resin film in the case of a container having a wide diameter as in the container 1 of the above embodiment, but can also be formed by applying a paint containing a resin. As such paints, general-purpose waterproof and moisture-proof paints can be used. Especially when food containers are used for instant cup noodles and heat resistance is required, acrylic resin emulsion type or wax type paints can be used. A paint can be used. The choice of whether the resin layer is formed of a resin film or by applying a paint depends on the shape of the container, such as a deep container or a container having a constricted part, and the barrier characteristics required depending on the purpose of use of the container Etc. can be appropriately performed.
[0045]
Further, the papermaking container used in the container of the present invention is a bottomed cylindrical papermaking with a constant inner diameter in addition to the cup-shaped papermaking container that gradually expands upward as in the container 1 of the above embodiment. Although the container is particularly suitable, a papermaking container having a constriction or a shallow papermaking container can also be used.
[0046]
Further, in the container manufacturing method of the above embodiment, the flange portion is formed after the paper making container is dried. However, after the paper making container is dehydrated, the flange portion is formed and then dried. You can also In this case, the water content of the papermaking container after dehydration is preferably 10 to 30%, and more preferably 10 to 15%. In addition, the resin layer is formed after the flange portion is formed. However, the flange portion can be formed after the resin layer is formed.
[0047]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples.
A container having the following dimensions and shape as shown in FIGS. 1 and 2 was produced as follows.
[0048]
<Container shape>
Height H: 110mm
Opening inner diameter φ1: 90mm
Bottom outer diameter φ2: 70mm
Papermaking container overhanging portion inclination angle θ: 5 degrees Papermaking container peripheral wall thickness T1: 0.8 mm
Paper container body thickness T2: 1.0 mm
Papermaking container bottom thickness T3: 1.2mm
[0049]
<Making paper making containers>
A male mold provided with a silicone rubber papermaking section corresponding to the papermaking container and a nylon net (50 mesh, wire diameter 100 μm) covering the papermaking section was immersed in a slurry having the following composition to form a papermaking container. .
Pulp slurry: (pulp fiber (virgin pulp: imitation waste paper = 3: 7 (weight ratio), pulp slurry concentration 0.5% by weight))
Sizing agent (2% by weight of pulp)
[0050]
<Dehydration and drying conditions for paper containers>
The papermaking container was placed between the female mold corresponding to the male mold, and dehydrated and dried under pressure under the following conditions.
Mold temperature: 145 ° C
Pressing force: 2.0 MPa (540 seconds)
[0051]
<Formation of flange part>
The flange portion was bent under the following conditions to form a hanging portion.
Surface temperature of jig 13 (made of aluminum): 140 ° C.
Female jig 14 (aluminum) surface temperature: 30 ° C
Pressing force: 0.5tonf
[0052]
<Formation of resin layer>
The following resin films were placed so that the inner layer was in contact with the inner pulp layer, and laminated under the following molding conditions. And the excess film was cut | disconnected in the edge part of a pulp layer after lamination | stacking.
Resin film;
Outer layer / inner layer = high density polyethylene / low density polyethylene resin film layer thickness: 150 μm
Molding condition;
Vacuum forming machine: Sanwa Kogyo brand name PLAVAC-FE36PHS
Film heating method: Infrared heater (space between heater and resin film 110mm)
Film heating temperature: 250 ° C (molding machine display temperature)
Film heating time: 35 seconds Plug dimensions: Diameter 60 mm x length 110 mm
Plug material: Aluminum (Teflon processing on the surface)
Plug temperature: 115 ° C (plug actual surface temperature)
Vacuum forming mold: mouth hole diameter φ88mm, bottom diameter φ70mm, height 110mm
Mold temperature for vacuum forming: 105 ° C (actual surface temperature inside the mold)
Molding time: 12 seconds
[Measurement of thickness of paper making container]
A part of the formed paper container was cut out and the thickness of each layer was measured with a tool microscope.
[0054]
[Measurement of density of pulp layer]
The density of the pulp was calculated based on the thickness, the area of the cut piece, its weight, and the total weight of the molded body.
[0055]
[Measurement of surface smoothness]
Surfcom 120A (manufactured by Tokyo Seimitsu Co., Ltd.) was used to measure the surface roughness, and the measurement conditions were cut-off: 2.5 mm, measurement length: 10.00 mm, filter: 2CR, measurement magnification: 500, inclination Correction: straight line, polarity: standard.
[0056]
The container thus produced has a total thickness (pulp layer + resin layer of the paper making container) of 0.8 to 1.3 mm, is thin and lightweight, can be erected even when three are stacked, and stacking It was confirmed that the property was good and the contents could be taken out smoothly.
In addition, the surface smoothness is high, the center line average roughness Ra is 100 to 200 μm, the maximum height Rmax is 200 μm or less, the adhesion of the resin film is good, there is no pinhole, and the printability of the outer surface is also good. Met.
[0057]
【The invention's effect】
The container of the present invention is excellent in stacking property and is easy to use without causing any trouble in taking out the contents.
[0058]
Moreover, according to the manufacturing method of the container of this invention, the said container of this invention can be manufactured suitably.
[Brief description of the drawings]
FIG. 1 is a judgment surface view schematically showing an embodiment of a container of the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part of the papermaking container used in the embodiment.
FIGS. 3A and 3B are diagrams schematically showing a part of a manufacturing process of a container according to the present invention, wherein FIG. 3A is a diagram showing a paper making process of the paper making container, FIG. 3B is a diagram showing a dehydration / drying process; (c) is a figure which shows the formation process of a flange part.
FIGS. 4A and 4B are schematic cross-sectional views of a main part showing a flange portion forming process, where FIG. 4A is a diagram showing a state before the jig is abutted, and FIG. FIG.
FIGS. 5A and 5B are schematic views showing the main part of another embodiment of the paper making container used in the container of the present invention, wherein FIG. 5A is a view showing a state before the flange part is formed, and FIG. It is a figure which shows the state after having performed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Container 2 Papermaking container 21 Perimeter wall part 22 Flange part 22a Inner part 23 Inner peripheral surface 23a Upper extension surface 24 Overhang | projection part 25 Inner surface 3 Resin layer

Claims (5)

  A container having a curled flange portion formed by winding a peripheral wall portion of an opening portion of a papermaking container inward, the inner portion of the flange portion being on an upper extending surface of an inner peripheral surface of the papermaking container Or the container located in the outer side from this upward extending surface. A container according to claim 1 in which the resin layer covering the inner surface and the flange portion of the papermaking vessel is formed. The container according to claim 1 or 2 , wherein the resin layer is formed of a film.   A paper making container having an overhanging portion projecting outward from the opening and a peripheral wall portion rising from the peripheral edge of the overhanging portion is formed in advance, and then the peripheral wall portion is wound inside, and the inner portion is the inner peripheral surface of the paper making container. The manufacturing method of the container which forms the curl-shaped flange part located on the outer side of this upper extending surface, or this outer extending surface.   A male mold having an elastically deformable papermaking portion having a plurality of gas-liquid flow passages communicating with the outside and the inside and a net covering the papermaking portion is immersed in a pulp slurry, and the male mold is provided through the gas-liquid flow passages. After forming the wet papermaking container on the surface of the net by sucking moisture in the pulp slurry from the outside to the inside of the male mold, the male mold on which the papermaking container is formed is used as the papermaking container. The bottom of the paper making container is inserted into the concave portion of the female mold having a concave shape corresponding to the outer shape of the paper, and then deformed so that the paper making portion follows the shape of the concave portion. The container manufacturing method according to claim 4, wherein the paper making container in the dehydrated state is formed.

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