JP2004067229A - Tray shape container and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tray shape container using, as the base material, a paper which is excellent in water resistance and gas barrier properties and is formable, without using a complex molding process such as a sheet forming or the like and also only using a conventional box manufacturing machine. <P>SOLUTION: The tray shape container having an opening is fabricated by folding each side board of the blank for the tray shape container, in which a side board 12 and a flange 13 are connected in this order continuously to one of the opposing two sides of a bottom board 11 and a tongue piece 121 and 122 are connected to the opposing two sides of the side board, to which the bottom board 11 and the flange 13 are not connected and the left and right edge of the flange are extended sideways each to be a flange tongue piece 131 and 132 having almost same width as the flange and by folding each flange mountainously, wherein a thermoplastic resin layer 1 is formed projectingly on the edge of the tongue piece, where the side board is not connected, so that the edge face of the paper is not exposed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tray-shaped container based on paper formed by heat sealing from a single blank sheet, and in particular, without going through complicated forming steps such as sheet forming, and a general box making. The present invention relates to a tray-shaped container made of paper having excellent water resistance and gas barrier properties, which can be formed only by using a press.
[0002]
[Prior art]
Conventionally, for example, a tray-shaped container in which a thermoplastic resin film is heated and softened and laminated and adhered by means such as a vacuum forming method is distributed on the inner surface of a tray container in which a blank sheet having a shape as shown in FIG. 7 is assembled. I have.
Further, for example, a tray-shaped container in which a blank sheet having a shape as shown in FIG. 8 is assembled using a dedicated box making system is also distributed.
In each case, the lid is covered with the opening and heat-sealed with a flange or the like, so that it is also used as a sealed container.
[0003]
In the former container, since the edges of the tongue pieces (121, 122) are exposed on the inner surface of the container when the box is made, a complicated process such as laminating and bonding a thermoplastic resin film from above the container by means such as a vacuum forming method is used. Water resistance is imparted by taking steps.
[0004]
In the latter case, when the box is made, the folded joint plate (51) and the second folded joint plate (52) are folded in two at the four corners, and then heat-sealed to the side plate (14). A step of stacking sheets is required, and the stacking efficiency is not good.
[0005]
[Problems to be solved by the invention]
The present invention has been made in order to solve the above-mentioned problems related to a tray-shaped container based on paper having water resistance and gas barrier, without going through complicated forming steps such as sheet forming, and Another object of the present invention is to provide a tray-shaped container made of paper having excellent water resistance and gas barrier properties, which can be formed only by using a general box-making machine.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 of the present invention comprises a laminated sheet made of paper having a thermoplastic resin layer formed on at least an inner surface thereof, and forms a folding line on one of two opposed sides of a rectangular bottom plate. The side plate and the flange are respectively connected in this order, and a tongue piece is continuously provided via a bending line to two opposite sides of the side plate where the bottom plate and the flange are not provided continuously. The left and right ends of the flange each extend in the lateral direction to form flange tongue pieces having substantially the same width as the flange. Each side plate of the paper tray-shaped container blank is valley-folded and the tongue piece is folded to the adjacent side plate. In a tray-shaped container having the above-mentioned opening, which is formed by stacking and folding each flange, a thermoplastic resin layer is provided so that a paper end face is not exposed at an edge not connected to a side plate of the tongue piece. Is formed to protrude It is a tray-like container according to symptoms.
[0007]
As described above, according to the first aspect of the present invention, the thermoplastic resin layer is formed so as to protrude from the edge of the tongue piece that is not connected to the side plate so that the paper end face is not exposed. Even if the tongue comes in contact with the contents by boxing the sheet, the end surface of the tongue is covered with the thermoplastic resin layer, so the paper surface is not exposed, ensuring water resistance and gas barrier properties it can. Further, it is not necessary to laminate a thermoplastic resin film or the like from the container by a method such as sheet molding.
[0008]
A second aspect of the present invention is the tray-like container according to the first aspect, wherein the laminated sheet includes a barrier layer.
[0009]
A third aspect of the present invention is the tray-shaped container according to the first or second aspect, wherein the barrier layer is an inorganic compound-deposited polyethylene terephthalate film.
[0010]
As described above, according to the second or third aspect of the present invention, a tray-like container having more excellent barrier properties can be produced by including a barrier layer such as an inorganic compound-deposited polyethylene terephthalate film in the laminated sheet.
[0011]
Further, the invention according to claim 4 comprises a laminated sheet made of paper having a thermoplastic resin layer formed on at least an inner surface thereof, and a side plate and a flange formed on two opposite sides of a square bottom plate. Are respectively provided in this order, and tongue pieces are continuously provided on two opposite sides of the side plate where the bottom plate and the flange are not provided continuously, and the left and right ends of the flange extend in the lateral direction, respectively. Each side plate of the paper tray-shaped container blank formed with flange tongue pieces having substantially the same width as the flange is valley-folded, the tongue pieces are folded on adjacent side plates, and each flange is assembled by mountain-folding. A method for manufacturing a tray-shaped container having the opening, wherein a hole having a predetermined width is formed at a position corresponding to an outer peripheral edge of the paper roll, which is a base material, which is not continuous with the side plate of the tongue piece. Punching process to be set up, At least a thermoplastic resin laminating process to form a thermoplastic resin layer on one side, a punching process of punching a roll of thermoplastic resin laminated paper into blank sheets, and assembling the punched blank sheets into tray-like containers A method for producing a tray-shaped container, wherein a box step and the above steps are produced in this order.
[0012]
As described above, according to the fourth aspect of the present invention, a hole having a constant width is formed at a position corresponding to the outer side of the peripheral edge which is not connected to the side plate of the tongue piece of the winding paper as the base material. Step, a thermoplastic resin laminating step of forming a thermoplastic resin layer on at least one surface of the perforated wound paper, a punching step of punching the thermoplastic resin laminated paper into blank sheets one by one, and punching. Since the box-making process of assembling the blank sheet into a tray-shaped container and the above-described steps are manufactured in this order, the tray-shaped container can be manufactured efficiently and relatively inexpensively without going through complicated steps.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
The tray-shaped container of the present invention will be described in detail below based on one embodiment.
The tray-shaped container of the present invention is constructed by assembling a blank sheet (10) as described below, for example, as shown in FIGS.
[0014]
That is, in the blank sheet (10), first, the side plates (12, 12) and the flanges (13, 13) are arranged in this order through two bending lines on one of two opposite sides of the rectangular bottom plate (11). It is installed continuously.
[0015]
Triangular tongues (121, 122) are respectively connected to the two opposite sides of the side plates (12, 12), which are not provided with the bottom plate or the flange, through bending lines.
The left and right ends of the flanges (13, 13) extend in the lateral direction, and are formed with flange tongues (131, 132) having substantially the same width as the flange.
[0016]
Side plates (14, 14) and flanges (15, 15) are also provided in this order on the other two opposite sides via bending lines.
The left and right ends of the flanges (15, 15) extend in the lateral direction, and are formed with flange tongue pieces (151, 152) having substantially the same width as the flange.
[0017]
Then, each side plate (12, 12, 14, 14) of the blank sheet (10) having such a shape is folded in a valley, and the triangular tongue pieces (121, 121, 122, 122) are folded into adjacent side plates. By stacking and assembling the flanges (13, 13, 15, 15) by mountain folding, a tray-like container (20) having an opening larger than the bottom plate (11) can be manufactured.
[0018]
Further, the tray-shaped container (20) is composed of a laminated sheet (10) made of paper having a thermoplastic resin layer provided on at least the inner surface (1) as a base material (3).
The edge of the tongue piece (121, 122) that is not connected to the side plate (12) is formed by forming the thermoplastic resin layer (1), which is the inner side surface, from the base material (3). I have.
[0019]
As a result, when molded into a tray-shaped container, the paper end surfaces of the tongue pieces (121, 122) that overlap with the side plates and are heat-sealed or the like are not directly exposed, and are not directly exposed to the thermoplastic resin layer (1). Even when the contents are stored in the tray-shaped container (20), the paper end surface of the tongue does not touch the contents, so that the expectation and liquid do not penetrate through the paper end surface, Barrier properties can be maintained.
[0020]
As the thermoplastic resin layer (1) formed on the inner surface of the laminated sheet (10), a polyolefin-based resin such as polyethylene or polypropylene can be preferably used. Among them, polyethylene can be suitably used from the viewpoint of workability.
In addition, you may form a thermoplastic resin layer also on the outer surface of the laminated sheet (10) as needed.
[0021]
The laminated sheet (10) may be provided with a barrier layer (5) as needed. This further improves the barrier properties.
In the example shown in FIG. 3, an outer layer (2) composed of an adhesive layer (4) / a barrier layer (5) / a polyethylene layer (6) is provided on the outer surface of a substrate (3).
[0022]
The barrier layer (5) is formed by depositing a thin film of an inorganic compound such as aluminum oxide or silicon oxide on a stretched film such as a uniaxially or biaxially stretched polyethylene terephthalate film, a polyamide film, or a polyolefin film by physical vapor deposition or chemical vapor deposition. An inorganic compound vapor-deposited plastic film or the like provided in a thickness of about 20 to 100 nm by the method can be used. Above all, a vapor-deposited film obtained by vapor-depositing a thin film of an inorganic compound on a polyethylene terephthalate film can be more preferably used.
[0023]
Further, the barrier layer (5) may be a resin layer composed of a film containing a water-soluble resin and an inorganic layer compound, or a film obtained by reacting a metal alkoxide or a hydrolyzate thereof with an isocyanate compound.
[0024]
FIG. 4 is a block diagram showing components of the tray-shaped container manufacturing process of the present invention.
The process of manufacturing the tray-shaped container will be described based on this block diagram.
First, necessary matters, a design, and the like are printed on a winding paper (3) as a base material, and a printing layer (not shown) is provided (printing process to A) (see FIG. 5).
By providing the printing layer, the positional relationship between the blank sheets becomes clear.
[0025]
Next, a hole groove (16) having a fixed width is formed outside the peripheral edge of the printed towel (3) that is not connected to the side plates (12, 12) of the triangular tongue pieces (121, 122). (Punching process to B) (see FIG. 6).
Note that the printing step and the punching step may be performed simultaneously.
[0026]
A thermoplastic resin layer (1) is formed on at least the inner surface of the perforated wound paper (3) (thermoplastic resin layer laminating step to C).
As a lamination method, for example, a melt extrusion lamination method in which a molten thermoplastic resin such as polyethylene is extruded into a film by an extruder, and a roll of paper is pressed and laminated while the film is in a molten state, can be preferably used.
A thermoplastic resin layer (1) may be formed on both the inner surface and the outer surface. By forming a thermoplastic resin layer on the outer side surface (2), for example, adhesion of sewage from the outside can be prevented (see FIG. 2C).
[0027]
Finally, a blank sheet (10) is punched out from the rolled paper on which the thermoplastic resin layer is laminated (punching step to D).
[0028]
The blank sheet thus punched is assembled into a tray-shaped container having four corners heat-sealed using a commonly used box-making machine (box-making process to E).
When assembled in a tray-shaped container, the end surfaces of the tongue pieces (121, 122) are covered with a thermoplastic resin layer, so that the paper surface is not exposed, and water resistance and gas barrier properties can be secured.
[0029]
【The invention's effect】
As described above, the tray-shaped container of the present invention is designed so that the end surface of the tongue piece inside the container is covered with the thermoplastic resin layer so that the paper end surface is not exposed, so that the water-resistant and gas barrier properties are easily obtained. Can be added.
[Brief description of the drawings]
FIG. 1 is an explanatory plan view showing one embodiment of a blank sheet of a tray-shaped container of the present invention.
2A is a perspective explanatory view showing a state where a tray-like container is assembled from the blank sheet of FIG. 1, and FIG. 2B is an enlarged sectional explanatory view taken along line AA ′ of FIG. (C) is an enlarged cross-sectional explanatory view taken along the line AA ′ of (a) when assembled using a blank sheet having thermoplastic resin layers formed on both the inner surface and the outer surface.
FIG. 3 is an explanatory sectional view showing another embodiment of the laminated sheet used for the tray-shaped container of the present invention.
FIG. 4 is a block diagram showing components of a tray-shaped container manufacturing process of the present invention.
FIG. 5 is a schematic explanatory view showing the state of the rolled paper at the end of printing of the tray-shaped container of the present invention.
FIG. 6 is a schematic explanatory view showing the state of the rolled paper at the time of completion of punching of the tray-shaped container of the present invention.
FIG. 7 is an explanatory plan view showing an example of a blank sheet of a conventional tray-shaped container.
FIG. 8 is an explanatory plan view showing another example of a blank sheet of a conventional tray-shaped container.
[Explanation of symbols]
1 {thermoplastic resin layer 2} outer surface 3} base material, roll paper 4 {adhesive layer 5} barrier layer 6 {polyethylene 10} laminated sheet, blank sheet 11 {bottom plate 12} {Side plate 13} Flange 14 >> Side plate 15 >> Flange 16 >> Hole groove 51 >> Folding joint plate 52 >> Second folding joint plates 121,122 {Tongue pieces 131, 132, 151, 152} ‥ Flange tongue

Claims (4)

It is composed of a laminated sheet based on paper on which a thermoplastic resin layer is formed on at least the inner surface,
Side plates and flanges are respectively provided in this order via bending lines on one of two opposing sides of the square bottom plate,
A tongue piece is continuously provided via a bending line on two opposite sides of the side plate where the bottom plate and the flange are not continuously provided,
The left and right ends of the flange each extend in the lateral direction to form a flange tongue piece having substantially the same width as the flange.Fold each side plate of the paper tray-shaped container blank and fold the tongue piece to the adjacent side plate. Folding, assembled by folding each flange in a mountain, in a tray-shaped container having the opening,
A tray-like container, wherein a thermoplastic resin layer is formed so as to protrude from an edge not connected to a side plate of the tongue piece so that a paper end surface is not exposed. The tray-shaped container according to claim 1, wherein the laminated sheet includes a barrier layer. The tray-shaped container according to claim 1, wherein the barrier layer is an inorganic compound-deposited polyethylene terephthalate film. It is composed of a laminated sheet based on paper on which a thermoplastic resin layer is formed on at least the inner side surface, and a side plate and a flange are respectively provided in this order on two opposite sides of one of the square bottom plates, A tongue piece is continuously provided on the opposite side of the side plate where the bottom plate and the flange are not provided, and the right and left ends of the flange extend in the lateral direction, respectively, and have a flange tongue piece having substantially the same width as the flange. The tray-shaped container having the opening, wherein each side plate of the paper tray-shaped container blank formed with the valley is folded while the tongue piece is folded over the adjacent side plate, and each flange is assembled by mountain-folding. The method of manufacturing
A hole-punching step of forming a hole of a fixed width at a position corresponding to a peripheral outer side not connected to the side plate of the tongue piece of the winding paper as a base material,
Thermoplastic resin laminating step of forming a thermoplastic resin layer on at least one side of the perforated wound paper,
A punching step of punching a roll of laminated thermoplastic resin into blank sheets one by one;
Box-making process of assembling punched blank sheets into tray-like containers,
A method for manufacturing a tray-shaped container, wherein each of the above steps is manufactured in this order.

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