JP2006298422A - Liquid food container manufacturing method, manufacturing apparatus, and liquid food container according to the manufacturing method, wherein the top wall and the side wall are a paper base and the bottom is made of a thermoplastic material - Google Patents

Abstract

An object of the present invention is to provide a liquid food container manufacturing method, apparatus, and container that eliminates a sealing failure, pinholes, cracks, and the like in the vicinity of the lower flap of the bottom and does not leak.
A “liquid food container manufacturing apparatus” 29 forms a liquid food container 34 including a bottom portion 31 of a thermoplastic material 30 and a side wall 32 and a top portion 33 of a packaging material 2 of a paper base material 4 to form a content liquid. Q is filled. A feeding process 35 for continuously feeding the packaging material 2 on which the crease wire 20 is formed, a cutting process 37 for transversely cutting the packaging material 2 into a sheet 36, and a vertical seal for forming a short cylinder 39 by longitudinally sealing the sheet 36 Step 40, a molding step 41 for forming the bottom 31 by molding the opening 39b of the short cylinder 39 with the thermoplastic material 30, a filling step 44 for filling the content liquid Q from the opening 39b of the short cylinder 39, The short cylinder 39 filled with the content liquid Q is folded along the crease line 20 and sealed to form a side wall 32 and a top portion 33 to form a molding step 43.
[Selection] Figure 1

Description

  The present invention relates to a liquid food container and a method for producing the same, and more specifically, a liquid food in which a top portion and a side wall of a liquid food container comprising a top portion, a bottom portion and a side wall are formed of a paper base and a bottom portion is resin-molded by injection molding Related to container technology.

  Conventionally, for example, the content of Patent Document 1 is known regarding a configuration in which a liquid beverage such as milk or juice (hereinafter referred to as “content liquid” as appropriate) is enclosed in a liquid food container in which a packaging material made of a paper base is formed. .

  As shown in FIGS. 11 and 12, a packaging material 2 of a brick-shaped liquid food container 1 (hereinafter referred to as a container as appropriate) is formed in order from the outside to the inside of the container 1, an outer layer 3, a paper substrate 4. , Inner layer 5 (adhesive layer 6, barrier layer 7, adhesive layer 8 and innermost layer 9).

  Usually, the outer layer 3, the adhesive layer 8 and the innermost layer 9 are formed of a resin such as polyethylene (PE) or ethylene copolymer, and the outer layer 3 and the innermost layer 9 are formed of a low density polyethylene (LDPE), and a barrier layer. 7 is formed of aluminum foil or the like.

  A crease line (crease) 20 is formed on the paper base 4 of the packaging material 2 so as to be easily formed. The top surface 10 of the container 1 is formed with a straw hole 12 that penetrates the paper base material 4 with a diameter of 6 mm, for example, and can be drunk by inserting a straw when drinking the content liquid.

  Here, as shown in FIGS. 13A and 13B, in the process of manufacturing the liquid food container 1 filled with the content liquid Q, the belt-like packaging material 2 is continuously conveyed while being transported into a filling machine (not shown). The packaging material tube 15 is formed by filling the content liquid Q into the tube.

  The packaging material tube 15 is laterally sealed 16 at a predetermined interval in a lateral sealing device (not shown), and the packaging material tube is separated and cut by a cutting device (not shown) to form a pillow-shaped prototype container 17. .

  As shown in FIGS. 14A and 14B, the pillow-shaped prototype container 17 is formed along a crease line (crease) 20 by a molding device (not shown), so that the upper flap 18 and the lower flap 19 are arrows. The brick-shaped liquid food container 1 is completed by being easily folded in this direction and sealed by the container side 22 and the container bottom 21.

The user can suck out and drink the content liquid Q by piercing the straw into the straw hole 12 formed on the top surface 10 of the container 1.
JP 2002-179049 A.

  However, when the upper flap 18 and the lower flap 19 are folded and sealed to the container side surface 22 and the container bottom surface 21, the upper flap 18 is folded at an angle of 90 degrees with respect to the container side surface 22. The flap 19 is folded at an angle of 180 degrees with respect to the container bottom surface 21.

  For this reason, the lower flap 19 is subjected to an excessive force as the folding angle is larger than that of the upper flap 18, so that the possibility of stress concentration in the vicinity of the lower flap 19 is increased. Sealing failure, pinholes, cracks, and the like may occur on the bottom surface 21 of the container, and as a result, leakage of the content liquid Q may occur.

  The present invention solves such conventional problems, and provides a liquid food container manufacturing method, apparatus, and container that eliminates sealing failure, pinholes, cracks, and the like in the vicinity of the bottom lower flap 19 and does not cause leakage. With the goal.

  Invention of Claim 1 is a manufacturing method of the liquid food container which consists of the bottom part of a thermoplastic material, the side wall of a paper base material, and a top wall, Comprising: The said strip | belt-shaped paper base material which formed the crease line was continuously provided. After transverse cutting to a predetermined length and making a short cylinder with a vertical seal, one opening of this short cylinder part is molded with a thermoplastic material to form the bottom, and after filling the content liquid from the other opening The short cylinder portion except the bottom portion is folded and sealed along the crease line to form the side wall and the top wall.

  According to this method for manufacturing a liquid food container, one of the opening portions of the short tube portion is molded with a thermoplastic material so that the bottom portion is easily formed, and is folded and sealed along the crease line so as to form the side wall and the top wall. Is easily formed.

  Invention of Claim 2 is the manufacturing method of the liquid food container of Claim 1, Comprising: The said mold process is injection molding in the metal mold | die by a nozzle, By this metal mold | die, one side of the said short cylinder part is carried out Close the opening end of the opening and the vicinity thereof to form a cavity, inject the molten thermoplastic material from the nozzle into the cavity, and immediately cool the injected molten thermoplastic material, The bottom portion is formed of a thermoplastic material that covers one opening of the short cylinder portion by detachment of the mold from the vicinity of the opening.

  In the liquid food container manufacturing method, this mold closes the opening end of one of the short cylindrical portions and the vicinity thereof to form a cavity, so that the molten thermoplastic material is injected into the injection mold. The bottom can be molded by injection.

  Furthermore, since the molten thermoplastic material injected immediately can be cooled, the bottom can be reliably and quickly formed.

  The invention of claim 3 is a liquid food container comprising a bottom part of a thermoplastic material, a side wall and a top wall of a paper base material, and the belt-like paper base material on which a crease line is formed is continuously extended to a predetermined length. Then, the bottom portion is formed by molding one opening of the short tube portion with a thermoplastic material and filling the content liquid from the other opening portion. The short cylinder part except for is folded and sealed along the crease line to form a side wall and a top wall.

  With this liquid food container, one opening of the short tube portion is molded with a thermoplastic material to form the bottom, and it is easily folded and sealed along the crease line so that the side wall and the top wall are securely Can be formed.

  Invention of Claim 4 is the liquid food container of Claim 3, Comprising: The said mold process is injection molding in the metal mold | die by a nozzle, This metal mold | die of one opening part of the said short cylinder part A cavity is formed by closing the open end and its vicinity, the molten thermoplastic material is injected from the nozzle into the cavity, and the injected molten thermoplastic material is immediately cooled, and the mold The bottom portion is formed of a thermoplastic material that covers one opening portion of the short cylinder portion by detachment from the vicinity of the opening portion.

  In this liquid food container, a mold is used to close the open end of one of the short cylindrical portions and the vicinity thereof to form a cavity, so that the molten thermoplastic material is injected into the injection mold. Thus, the bottom can be easily formed.

  Further, since the molten thermoplastic material injected immediately can be cooled, the bottom portion is reliably and quickly formed.

  Invention of Claim 5 is the liquid food container of Claim 3 or Claim 4, Comprising: As for the external shape of the said liquid food container, the cross section of the opening edge part of the said bottom part is substantially rectangular shape (4 corners are arc shape) Or a substantially oval shape (including a substantially circular shape), and the side wall and the top wall have a brick shape, a roof shape, or a substantially wedge shape in which the top wall is linearly sealed. Yes.

  If it is this liquid food container, various shapes of container shapes can be obtained.

  The invention of claim 6 is an apparatus for manufacturing a liquid food container comprising a bottom part of a thermoplastic material, a side wall and a top wall of a paper base material, and continuously forming the strip-like paper base material on which a crease line is formed. A feeding step for feeding, a cutting step for transversely cutting the paper substrate into a sheet of a predetermined length, a vertical sealing step for vertically sealing the cut sheet into a short cylinder, and one of the short cylinder portions A molding process in which the opening is molded with a thermoplastic material to form a bottom, a filling process in which the liquid is filled from the other opening while the short cylinder is being conveyed, and the short cylinder in which the liquid is filled It is characterized by comprising a molding step in which the side wall and the top wall are formed by folding and sealing the portion along the crease line.

  In this liquid food container manufacturing apparatus, one of the opening portions of the short tube portion is molded with a thermoplastic material so that the bottom portion is easily formed, and is folded and sealed along the crease line so that the side wall and the top wall are formed. Is easily formed.

  A seventh aspect of the present invention is the apparatus for manufacturing a liquid food container according to the sixth aspect, wherein the molding step encloses an opening end of one opening of the short cylinder and the vicinity thereof to form a cavity. And a conveying means for conveying the short cylindrical portion to a mold position, and a conveying means for conveying the short cylindrical portion to a mold position. Injection means for injecting the molten thermoplastic material into the mold; cooling means for cooling the thermoplastic material injected into the cavity through the mold; and the nozzle and the mold at one open end of the short cylinder portion And a drive means for forming and releasing a cavity by closing the portion and the vicinity thereof.

  In this liquid food container manufacturing apparatus, a mold is used to enclose the opening end of one of the short cylindrical portions and the vicinity thereof to form a cavity, so that the molten thermoplastic material is injected into the injection mold. The bottom can be molded by injection.

  Furthermore, since the molten thermoplastic material injected immediately can be cooled, the bottom can be reliably and quickly formed.

  According to the first aspect of the present invention, since the bottom portion is easily formed by molding one opening portion of the short cylinder portion with a thermoplastic material, a seal failure, a pinhole, a crack or the like in the vicinity of the lower flap of the bottom portion This prevents leakage from the bottom.

  According to the second aspect of the present invention, since the cavity can be formed by the mold and the molten thermoplastic material is injected into the mold and cooled, the bottom portion can be reliably and quickly molded. In addition to the effect of not decreasing, the same effect as the effect of the invention of claim 1 can be obtained.

  According to the third aspect of the present invention, in addition to the effect that the side wall and the top wall can be surely formed because they are easily folded and sealed along the crease line, in addition to the effect that the formability is improved, The same effect is obtained.

  According to the invention described in claim 4, the same effect as that of the invention described in claim 2 can be obtained.

  According to the invention described in claim 5, since the container shapes of the liquid food containers having various shapes can be obtained, the commercial value can be increased.

  According to the invention described in claim 6, the same effect as that of the invention described in claim 1 can be obtained.

  According to the invention described in claim 7, the same effect as that of the invention described in claim 2 can be obtained.

<First Embodiment of the Present Invention>
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. In addition, the same code | symbol is suitably attached | subjected and demonstrated to an equivalent part to the structure shown in FIGS.

<Configuration of manufacturing apparatus for liquid food containers>
As shown in FIG. 1, the “liquid food container manufacturing apparatus” 29 of the present invention is a liquid in which a side wall 32 and a top 33 are formed by a bottom 31 of a thermoplastic material 30 and a packaging material 2 made of a paper base 4. This is an apparatus for manufacturing a liquid food container 34 in which the food container 34 is filled with the content liquid Q.

  The “liquid food container manufacturing apparatus” 29 is composed of the following six steps.

  (1) A feeding process 35 for continuously feeding the band-shaped packaging material 2 on which the crease wire 20 is formed.

  (2) A cutting step 37 for transversely cutting the packaging material 2 into a sheet 36 having a predetermined length.

  (3) A vertical sealing step 40 in which the cut sheet 36 is vertically sealed 36b to form a short cylinder 39.

  (4) A molding step 41 in which one opening 39b of the short cylinder 39 is molded with the thermoplastic material 30 to form the bottom 31. The short cylinders 39 are mounted on two rows of rotating mandrels 42 and move every 90 degrees.

  (5) A filling process 44 in which the liquid Q is filled from the tank 42a through the filling pipe 42b while the short cylinders 39 are conveyed in two rows.

  (6) A molding step 43 in which the short cylinder 39 filled with the content liquid Q is folded and sealed along the crease line 20 by a molding device (not shown) to form the side wall 32 and the top 33.

  As shown in FIGS. 2, 3 (a) and 3 (b), the packaging material 2 of the brick-shaped liquid food container 34 is formed in order from the outer side to the inner side of the container 1. An inner layer 5 (adhesive layer 6, barrier layer 7, adhesive layer 8 and innermost layer 9) is provided.

  In general, the outer layer 3, the adhesive layer 8 and the innermost layer 9 are preferably formed of a resin such as polyethylene (PE) or an ethylene copolymer, and the outer layer 3 and the innermost layer 9 are preferably formed of a low density polyethylene (LDPE). . The barrier layer 7 is made of an oxygen barrier material such as aluminum foil. Furthermore, printing such as a design (not shown) is performed on the outer surface of the outer layer 3 or the outer surface of the paper substrate 4 as necessary.

  The top surface 10 of the container 1 is formed with a straw hole 12 that penetrates the paper base material 4 with a diameter of 6 mm, for example, and can be drunk by inserting a straw when drinking the content liquid.

  A crease line (crease) 20 is formed on the paper base 4 of the band-shaped packaging material 2 so as to be easily formed. The pattern of the crease line 20 is selected according to a predetermined container shape. In the figure, the crease line 20a is a pattern in which the top portion 33 is formed in a rectangular cylindrical shape, and the other crease line 20b is formed in order to form the side wall 32 in the vicinity of the top portion 33 in a rectangular cylindrical shape. Only formed.

  Thus, the strip-shaped packaging material 2 on which the crease wire 20 is formed is continuously unwound from the rolled state, and is conveyed through the “liquid food container manufacturing apparatus” 29 via a roller.

  In the cutting step 37, the packaging material 2 is cut at a transverse cutting portion into a sheet 36 having a length corresponding to one pack of containers. Then, in the vertical sealing step 40, the sheet 36 is folded at both end portions 36a of the packaging material 2 and the vertical seal 36b is formed, whereby a rectangular cylindrical short tube 39 having a vertical seal portion 38 as shown in FIG. 4 is formed. It is formed. At this time, a strip tape (not shown) covering the joint portion 38a on the inner surface 39a side of the short tube 39 is simultaneously sealed to prevent leakage of the content liquid from the vertical seal portion 38.

  Here, the side surface 32a in the vicinity of the top side of the short cylinder 39 is easily bent along the crease line 20, so that the side surface 32b in the vicinity of the bottom side is formed with a sharp rectangular cross section. Is not formed so that it is not bent sharply, so that it is formed in a “substantially” rectangular shape.

  As shown in FIG. 5, the short cylinder 39 is inserted into a mandrel 42 as a conveying means from the top side, rotated 90 degrees in the direction of the arrow along with the rotation of the mandrel 42, and sent to the molding step 41.

  The molding step 41 has a mold 45 that closes the opening end 39c of one opening 39b of the short cylinder 39 and the vicinity thereof to form a cavity 45a, and a flow path that communicates with the inside of the cavity 45a. An injection molding apparatus 47 having a nozzle 46 is provided.

  More specifically, in the molding step 41, an injection means (not shown) for injecting a molten thermoplastic material from the nozzle 46 into the cavity 45a and a thermoplastic material injected into the cavity 45a through the mold 45 are used. A cooling means (not shown) for cooling, the nozzle 46 and the mold 45 are moved upward and downward, and one opening end portion of the short cylinder 39 and its vicinity are closed to form and release a cavity 45a. Driving means (not shown) is provided.

  At the tip of the mandrel 42, the opening end 39c of one opening 39b of the short cylinder 39 and the vicinity thereof are part of a cavity 45a that holds the short cylinder 39 from the inner surface 39a side (the cavity 45a is shielded). Receiving part 48 is formed, and the receiving part 48 is also provided with a cooling means (not shown) for cooling the thermoplastic material injected into the cavity 45a.

  As shown in FIG. 6, the injection molding device 47 is moved upward so that the opening end 39 c of one opening 39 b of the short cylinder 39 and its vicinity 39 e are sandwiched between the mold 45 and the receiving portion 48, The thermoplastic material 49 is injected from the nozzle 46 into the closed cavity 45a and cooled at the same time, whereby the bottom portion 31 in which the opening 39b of the short cylinder 39 is molded with the thermoplastic material 49 is formed.

  Thereafter, after the mold 45 of the injection molding apparatus 47 is moved downward, the short cylinder 39 is further rotated 90 degrees in the direction of the arrow in accordance with the rotation of the mandrel 42 as the conveying means, and then vertically self-supported by an apparatus (not shown). The state is sent to the filling process 44 by a filling conveyor. At that time, the short tube 39 is formed with the bottom 31 as shown in FIG.

  The short cylinder 39 in which the bottom portion 31 is formed is filled with a predetermined content liquid Q from the other opening 39d through a filling pipe 42b in a filling step 44 while being conveyed by a filling conveyor.

  Finally, the short cylinder 39 filled with the content liquid Q in the molding step 43 is folded and sealed along the crease line 20 by a molding machine (not shown) to form the side wall 32 and the top 33.

  As described above, the crease line 20a is a pattern for easily forming the top portion 33 into a rectangular cylindrical shape, and the crease line 20b is for forming the side wall 32 in the vicinity of the top portion 33 into a rectangular cylindrical shape. It is formed only halfway. For this reason, the container 34 in the completed state filled with the content liquid Q is surely formed with the top 33 in a rectangular shape, and the bottom 31 has a “substantially” rectangular cylindrical shape.

  In addition, according to the manufacturing apparatus of the said liquid food container, the liquid food container 1 of various shapes can be manufactured, and as shown to FIG. 8 (a), (b), it is by the thermoplastic material 49 of the same shape as the above. A container 1 in which the bottom 31 is formed and the top 33 is laterally sealed in a straight line and formed in a wedge shape, or a container 1 in which the top 33 is formed in a roof shape can be formed.

<Operation of manufacturing apparatus for liquid food containers>
As described above, the injection molding device 47 is moved upward, the opening end 39c of one opening 39b of the short cylinder 39 and its vicinity 39e are sandwiched between the mold 45 and the receiving portion 48 and closed. The bottom portion 31 is formed by molding the opening 39b of the short cylinder 39 with the thermoplastic material 49 by cooling the thermoplastic material 49 in the cavity 45a at the same time as it is injected from the nozzle 46.

  For this reason, since the bottom 31 of the liquid food container 1 is not folded, there is no sealing failure and stress concentration does not occur, so that no pinhole is generated in the bottom 31 of the container 1 and the bottom 31 Leakage can be prevented.

  And since a yield improves, manufacturing cost can be held down low.

<Second Embodiment of the Present Invention>
FIG. 9A shows a container 1 in which the top portion 33 is made of a brick 31 and the top portion 33 is made of a thermoplastic material 49 in which peaks S and valleys T are arranged, and FIG. 9B shows heat in which peaks S and valleys T are arranged. FIG. 9C shows the container 1 in which the top portion 33 is laterally sealed linearly at the bottom portion 31 of the plastic material 49 and formed in a wedge shape. FIG. The top 33 is the container 1 formed in a roof shape.

  For this reason, since the variation of the bottom part 31 of the liquid food container 1 can be selected, differentiation of goods becomes possible.

  The same effect as in the first embodiment of the present invention can be obtained.

<Third Embodiment of the Present Invention>
10A is a bottom portion 31 of a thermoplastic material 49 having a central portion recessed in the container, and a top portion 33 is a brick-shaped container 1. FIG. 10B is a thermoplastic material 49 having a central portion recessed in the container. FIG. 10C shows a container 1 in which the top 33 is laterally sealed in a straight line at the bottom 31 and formed in a wedge shape. FIG. 10C shows the bottom 31 made of a thermoplastic material 49 whose center is recessed inside the container. It is the container 1 formed in.

  For this reason, since the variation of the bottom part 31 of the liquid food container 1 can be selected, differentiation of goods becomes possible.

  The same effect as in the first embodiment of the present invention can be obtained.

  As mentioned above, although embodiment of this invention was described based on drawing, all said Example showed an example of this invention, and it cannot be overemphasized that this invention should not be limited to these. Absent.

  For example, the packaging material 2 is formed from the outside to the inside of the container 1 by LDPE / printing ink layer / paper substrate / LDPE / LDPE, or printing ink layer / LDPE / paper substrate / LDPE / LDPE, or LDPE / printing ink layer / Configurations such as paper base material / LDPE / aluminum foil / polyester (PET) are also possible.

  Further, an ethylene-α-olefin copolymer (so-called metallocene PE) polymerized using a single site catalyst in addition to LDPE can be used for the innermost layer and / or the outermost layer.

  Moreover, it can replace with the metal layer (aluminum foil) as said oxygen barrier material, and can also use the vapor deposition layer of an inorganic oxide. Instead of the paper base material (fibrous material), a plastic base material in which a plastic material is kneaded with a powdery or granular inorganic substance can be used.

  Furthermore, the liquid food container can be applied to various shapes of liquid food containers such as hexagonal columnar, octagonal columnar, columnar liquid food containers having a quadrangular top and bottom surface and an octagonal body.

It is a perspective view which shows the manufacturing apparatus of the liquid food container in the 1st Embodiment of this invention. It is a perspective view of a liquid food container in a 1st embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS (a) in the 1st Embodiment of this invention is sectional drawing of the packaging material of a liquid food container, (b) It is a layout drawing of the crease line (crease) formed in the packaging material of a liquid food container. It is a perspective view which shows the short cylinder of the rectangular cylinder shape before becoming a liquid food container in the 1st Embodiment of this invention. The side view which shows the state which the short cylinder 39 inserted in the mandrel 42 in the molding process 41 and the metal mold | die 45 of the injection molding apparatus 47 in the 1st Embodiment of this invention are separated. The side view which shows the state which pinched | interposed the front-end | tip part of the short cylinder 39 by the said receiving part 48 of the mandrel 42 and the metal mold | die 45 of the injection molding apparatus 47 in the molding process 41 in the 1st Embodiment of this invention. It is a perspective view which shows the state in which the bottom part 31 was formed in the short cylinder 39 in the 1st Embodiment of this invention. In the first embodiment of the present invention, (a) is a container in which a rectangular cylindrical bottom 31 and top 33 of a thermoplastic material 49 are horizontally sealed in a straight line and formed in a wedge shape. FIG. It is a perspective view which shows the container by which the rectangular cylindrical bottom part 31 and the top part 33 by the thermoplastic material 49 were formed in the roof shape. In the second embodiment of the present invention, (a) is a container in which the top part 33 is a brick shape with a bottom part 31 made of a thermoplastic material 49 in which the peak part S and the valley part T are arranged, and (b) is a peak part S and a valley part. A container in which the top 33 is laterally sealed in a straight line at the bottom 31 made of the thermoplastic material 49 having the T disposed thereon and formed in a wedge shape, and (c) is the bottom 31 made of the thermoplastic material 49 having the peak S and the valley T disposed therein. It is a perspective view which shows the container in which the top part 33 was formed in the roof type. In the third embodiment of the present invention, (a) is a bottom 31 made of a thermoplastic material 49 whose center is recessed inside the container, and the top 33 is a brick-shaped container, and (b) is recessed inside the container. A container in which the top 33 is laterally sealed linearly at the bottom 31 by the thermoplastic material 49 and formed in a wedge shape, (c) is the bottom 31 by the thermoplastic material 49 whose center is recessed inside the container, and the top 33 is a roof type. It is a perspective view which shows the container formed in. It is a perspective view of the liquid food container in a prior art example. It is sectional drawing of the packaging material of a liquid food container in a prior art example. (A) in a prior art example is a top view of the pillow-shaped original container 17, (b) is AA sectional drawing in Fig.13 (a). In the conventional example, (a) is formed along the crease line (crease) 20 by the forming apparatus, and the upper flap 18 and the lower flap 19 are folded respectively, and the plan view immediately before the liquid food container 1 is completed, (b) ) Is a sectional view taken along line BB in FIG.

Explanation of symbols

2 Packaging material Q Content liquid 20 Crease wire 29 Liquid food container manufacturing apparatus 30 Thermoplastic material 31 Bottom 32 Side wall 33 Top wall 34 Liquid food container 35 Feeding process 36 Sheet 37 Cutting process 38 Vertical seal part 39 Short cylinder 39a Opening part 39b Opening 40 Vertical sealing process 41 Molding process 42 Filling process 43 Molding process

Claims (7)

A method for producing a liquid food container comprising a bottom part of a thermoplastic material, and a side wall and a top wall of a paper substrate,
The strip-shaped paper base material on which the crease wire is formed is continuously cut into a predetermined length, and a short cylinder is formed with a vertical seal, and one opening of the short cylinder portion is molded with a thermoplastic material to form a bottom portion. And the side wall and the top wall are formed by filling the content liquid from the other opening and then folding and sealing the short cylindrical portion excluding the bottom along the crease line. A method for producing a food container. The method for producing a liquid food container according to claim 1, wherein the molding is injection molding into a mold by a nozzle,
The mold closes the opening end of one of the short cylindrical portions and the vicinity thereof to form a cavity, and injects the molten thermoplastic material from the nozzle into the cavity, and immediately injects it. The molten thermoplastic material is cooled, and the bottom portion of the thermoplastic material covering one opening of the short cylinder portion is formed by separating the mold from the vicinity of the opening. A method for producing a food container.   A liquid food container comprising a bottom portion of a thermoplastic material, and a side wall and a top wall of a paper base material, wherein the strip-like paper base material on which a crease line is formed is continuously cut into a predetermined length and longitudinally cut. After forming a short cylinder with a seal, molding one opening of the short cylinder with a thermoplastic material to form a bottom, filling the content liquid from the other opening, and then removing the short cylinder excluding the bottom A liquid food container comprising a side wall and a top wall formed by folding and sealing along the crease line.   The liquid food container according to claim 3, wherein the molding is injection molding into a mold by a nozzle, and the mold has an opening end portion of one opening portion of the short cylindrical portion and its vicinity. Closed to form a cavity, injecting a molten thermoplastic material from the nozzle into the cavity, and immediately cooling the injected molten thermoplastic material from the vicinity of the opening of the mold The liquid food container, wherein the bottom portion is formed of a thermoplastic material that covers one opening of the short cylinder portion by detachment.   5. The liquid food container according to claim 3, wherein an outer shape of the liquid food container is a substantially rectangular shape (including four corners including an arc shape) or a substantially oval cross section of the opening end of the bottom portion. A liquid food container having a shape (including a substantially circular shape), wherein the side wall and the top wall are in a brick shape, a roof shape, or a substantially wedge shape in which the top wall is linearly sealed. An apparatus for producing a liquid food container comprising a bottom part of a thermoplastic material, and a side wall and a top wall of a paper substrate,
A feeding step for continuously feeding the strip-shaped paper base material on which a crease line is formed, a cutting step for transversely cutting the paper base material into a sheet having a predetermined length, and a short seal by vertically sealing the cut sheet. A vertical sealing step for forming a cylinder, a molding step for molding one opening of this short cylinder portion with a thermoplastic material to form a bottom, and a liquid content from the other opening while conveying the short cylinder portion A liquid food container manufacturing method comprising: a filling step for filling, and a molding step for forming a side wall and a top wall by folding and sealing the short cylindrical portion filled with a liquid content along the crease line. apparatus. The apparatus for manufacturing a liquid food container according to claim 6, wherein the molding step includes a mold for forming a cavity by closing an opening end of one opening of the short cylinder and its vicinity. And an injection molding apparatus comprising a nozzle having a flow path communicating with the inside of the cavity,
Conveying means for conveying the short cylinder portion to a mold position, injection means for injecting a molten thermoplastic material from the nozzle into the cavity, and a thermoplastic material injected into the cavity through the mold Liquid food comprising cooling means for cooling, and drive means for forming a cavity by closing the opening end portion of the short cylinder portion and the vicinity thereof, and releasing the nozzle and the mold. Container manufacturing equipment.

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