JP2015131670A - Packaging container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging container which liberates gas generated from a content, moreover, has high heat insulation property, has a satisfactory strength and can reduce a manufacturing cost.SOLUTION: A packaging container includes: a first trunk part (110) made by rounding a first sheet material, overlapping both side edges on each other and adhering an overlapped part to make a cylindrical shape; a second trunk part (120) made by rounding a second sheet material, overlapping both side edges on each other and adhering an overlapped part to make a cylindrical part and is inserted to an inner part of the first trunk part; and a bottom part (130) and a cover part (140) which seal two open edges of the second trunk part respectively. Therein, a bottom part lateral inner curl is formed by folding an open edge of the bottom part side of the first trunk part to the inner side, a bottom part lateral outer curl is formed by folding an open edge of the bottom part side of the second trunk part to the outer side, the bottom part is adhered to the whole circumference of the bottom part lateral outer curl on the periphery part of one surface and is adhered to at least a part of bottom part lateral inner curl on the periphery part of the other surface and a backflow prevention valve which can exhaust gas to an external part of the container is provided on one part.

Description

  The present invention is a cylindrical packaging container that can efficiently discharge the gas generated from the contents by providing a backflow prevention valve on the wall of the packaging container. The present invention relates to a cylindrical packaging container.

Conventionally, when storing contents that are heated in the final process of manufacturing, if sealed and packaged immediately after manufacturing, water vapor accumulates inside the packaging container, condensation occurs, and it adheres to the contents, resulting in an appearance and quality. There was a problem that caused a drop.
In addition, roasted coffee beans and the like have a problem that carbon dioxide gas is generated and the bag is filled and swollen.
Similarly, in the case of fermented foods such as miso and natto, if the yeast is alive, carbon dioxide gas is generated and the internal pressure rises. In addition, water vapor is generated from foods immediately after cooking, especially baked foods such as bread. stay up.

With respect to such a problem, in Patent Document 1, a food that has been heated in the final stage of the manufacturing process is sealed with a packaging material that is made of a material having low oxygen permeability and moisture permeability and has a one-way valve. We have proposed a food package characterized by
Here, the one-way valve is configured such that the valve film is held by the push plate so as not to be detached, and a small amount of liquid layer is provided between the valve film and the valve body having a small hole, and the small film is opened from the inside of the packaging material through the small hole. The one-way system is constructed so that the valve film is allowed to pass slightly away from the valve body for the water vapor and air pressure applied, and the valve film is not allowed to pass through the valve body in close contact with the air pressure from the outside. It is a valve.
Alternatively, a one-way valve is formed by stacking a valve film and two opposing half-moon-shaped joint plates on a valve base material having a small hole, and laminating them at the joint plate portion, and between the valve film and the valve base material. A small amount of liquid layer is provided, and the valve film allows the passage of the water vapor and air pressure applied from the inside of the packaging material through the gas passage hole of the packaging material slightly away from the valve substrate, and the pressure of the air from the outside In contrast, the one-way valve is configured so that the valve film does not pass through the valve base material.
As a one-way valve, a one-way valve that uses a porous filter on the side in contact with the contents is proposed.

  However, even if such a gas permeable container discharges the generated gas such as water vapor or carbon dioxide to the outside of the container, it is difficult to transport and sell it without thermal insulation. If there is no heat insulation, the temperature of the contents will easily change in the case of contents that are easily affected by temperature changes due to opening and closing of the door, etc., even if transported under temperature control such as a cold car. In addition, the internal pressure also decreases accordingly, and in some cases, deformation of the container occurs, and the function of the container is impaired, such as separation of the alignment part of the body part and the alignment part of the body part with the lid and the bottom part. Deformation that could end up happening. If deformation occurs and it is partially destroyed, there is a problem that oxidation deterioration, fragrance and moisture decrease occur, corrosion occurs, and freshness is easily lost.

On the other hand, there is a corresponding method in which the base material of the container is made of paper in order to improve heat insulation. When paper is used as the main material, for example, a bottom material 13 having a peripheral edge 131 folded is inserted into a body 11 formed by rolling a sheet material into a cylindrical shape, and the periphery 13 is aligned with the inner surface of the body 11. The peripheral part 131 of the bottom member 13 is folded and welded at the end of the body part 11. FIG. 5 is a cross-sectional view showing a state where the trunk portion 11 folds the peripheral edge portion 131 of the bottom material in a conventional packaging container. Similarly, the lid member 14 is also formed by folding the peripheral edge portion and welding the body portion so as to sandwich it.
Alternatively, such a packaging container is manufactured by spirally winding a sheet material provided in the form of a roll, cutting the spiral paper tube, cutting it, and attaching the bottom sheet material to the end by bonding or the like. .
However, when the peripheral part of the bottom part is sandwiched between the end parts of the body part, complicated processing is required, so that the cost of the mold or the like is high. In particular, when thick paperboard is used in order to enhance heat insulation, it is difficult to process due to its too strong waist, and it is difficult to cope with the steps at the joints, and the strength is lowered. Further, when a spiral paper tube is used, a facility for supplying a sheet material in a roll is required. Therefore, in any case, the manufacturing cost is high. Therefore, as a cylindrical packaging container, there is a problem that the main material is paper, which is limited to manufacture in a large lot.

Japanese Utility Model Publication No. 62-90362

  Accordingly, it is an object of the present invention to provide a packaging container that allows gas generated from the contents to escape while having high heat insulating properties, strength, and reduced manufacturing costs.

The packaging container according to claim 1 of the present invention is a first body part that is formed by rounding the first sheet material, overlapping both side edges, and bonding the overlapping parts into a cylindrical shape,
Rounding the second sheet material, overlapping both side edges with each other, bonding the overlapping parts into a cylindrical shape, and a second barrel inserted into the first barrel,
A bottom and a lid for sealing the two open ends of the second body, respectively;
The bottom end side curl is formed by folding the open end on the bottom side of the first body portion inward,
A bottom-side outer curl is formed by folding the open end on the bottom side of the second body portion outward;
The bottom part is a packaging container that is bonded to the entire circumference of the bottom side outer curl at a peripheral part of one surface, and is bonded to at least a part of the inner curl of the bottom part at the peripheral part of the other surface,
A part of the packaging container is provided with a backflow prevention valve capable of discharging gas outside the container.

In the packaging container according to claim 2 of the present invention, the lid is
A ring that is fitted to the open ends of the first body portion and the second body portion on the lid side and is bonded at least to the entire circumference of the open end of the second body portion on the lid side;
The packaging container according to claim 1, further comprising a sealing lid having a peripheral edge bonded to the entire circumference of the ring and covering the ring.

In the packaging container according to claim 3 of the present invention, the lid end side inner curl is formed by folding the open end of the first body portion on the lid portion side inward,
The lid portion side outer curl is formed by folding the open end of the second body portion on the lid portion side outward,
The lid part is bonded to the entire circumference of at least the lid part side outer curl,
The packaging container according to claim 1, comprising a top surface portion sandwiched between a lid portion side outer curl and a lid portion side inner curl.

  The packaging container of Claim 4 of this invention is a packaging container in any one of Claims 1-3 in which a top | upper surface part has an opening plan part opened at the time of opening of a packaging container.

The packaging container according to claim 5 of the present invention is the packaging container according to any one of claims 1 to 4, wherein a backflow prevention valve is provided in the lid portion.

  The packaging container according to claim 6 of the present invention is the packaging container according to any one of claims 1 to 4, wherein a backflow prevention valve is provided at the bottom.

  The packaging container according to claim 7 of the present invention is the packaging container according to any one of claims 1 to 4, wherein the backflow prevention valve is provided in the second body portion.

  The packaging container according to claim 8 of the present invention is the packaging container according to claim 8, characterized in that the first body portion has air permeability.

  The packaging container of the present invention has high heat insulating properties and strength that can cope with changes in internal and external air pressure, and escapes gas generated from the contents, so that deformation of the container does not occur and low manufacturing costs can be realized.

It is a longitudinal cross-sectional view of the packaging container which concerns on the 1st Embodiment of this invention. In embodiment which shows an example of the backflow prevention valve used for this invention, it is sectional drawing which shows the movement according to the step. It is a longitudinal cross-sectional view of the packaging container which changed the backflow prevention valve attachment position which concerns on the 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the packaging container attached to the position which changed the backflow prevention valve shape and attachment position which concern on the 1st Embodiment of this invention, and protruded partially outside. It is a longitudinal cross-sectional view of the conventional packaging container. It is a chart which shows the manufacturing process of the packaging container which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the filling process which concerns on the 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the packaging container which concerns on the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the packaging container which concerns on the 3rd Embodiment of this invention.

(First embodiment)
FIG. 1 is a diagram schematically showing a longitudinal section of a packaging container 100 according to the present embodiment. The packaging container 100 includes a first body part 110, a second body part 120, a bottom part 130, and a lid part 140. The second body 120 is inserted into the first body 110. The bottom portion 130 and the lid portion 140 seal the open ends below and above the second body portion 120, respectively. A space surrounded by the second body 120, the bottom 130, and the lid 140 serves as a storage unit 150 that stores the contents.

  An open end of the first body 110 on the bottom 130 side is folded inside the first body 110 to form a bottom-side inner curl 111. The open end of the second body 120 on the bottom 130 side is folded outside the second body 120 to form a bottom side outer curl 121. In the example shown in FIG. 1, the bottom side inner curl 111 is formed by winding the open end of the first body portion 110 one or more times. Further, the bottom side outer curl 121 is formed by simply folding without folding the open end of the second body portion 120. The bottom portion 130 is bonded to the entire periphery of the bottom portion side outer curl 121 at the peripheral edge portion of the surface on the accommodating portion 150 side. The bottom 130 is bonded to the bottom side inner curl 111 at the peripheral edge of the other surface. The bottom 130 may be bonded to the entire circumference of the bottom-side inner curl 111 or may be partially bonded. Accordingly, the second body 120 is fixed to the first body 110 so as not to come out of the first body 110, and the peripheral portion of the bottom 130 can be protected by the bottom-side inner curl 111. .

  The lid 140 has an annular ring 141 and a seal lid 142. The ring 141 is fitted to the open ends of the first body part 110 and the second body part 120 on the lid part side, and fixes the positional relationship between the body parts. The ring 141 includes an outer ring portion 1411 that contacts the outer surface of the first body portion 110 and an inner ring portion 1412 that contacts the inner surface of the second body portion 120. The inner ring portion 1412 may contact the inner surface of the first body portion 110 and the outer surface of the second body portion 120. The ring 141 is adhered to the entire circumference of the open end of the second body 120 on the lid side, and the seal lid 142 is bonded to the entire circumference of the ring 141 to cover the ring 141. Yes. The ring 141 may be further bonded to the open end of the first body 110 on the lid side. The packaging container 100 is opened by peeling the seal lid 142 from the ring 141 or by opening a hole in the seal lid 142. The seal lid 142 may have a tab 143.

  The second body 120, the bottom 130, and the lid 140 are preferably formed of a sheet material having a barrier property. For example, the 2nd trunk | drum 120 can consider the sheet | seat etc. which have the layer structure of PE (polyethylene) / paper / PE / GL (silicon oxide vapor deposition film) / PE from the outer side to the inner side of the packaging container 100. There may not be PE of the outermost layer, and an aluminum foil or the like may be used instead of GL. Moreover, it is preferable that the bottom part 130 is formed with the sheet | seat material which has a barrier property which has a layer structure of PE / paper / PE / GL / PE from the outer side of the packaging container 100 to an inner side. There may not be PE of the outermost layer. Alternatively, the bottom portion 130 may be reinforced by stacking two or more sheet materials. Further, the ring 141 is formed of plastic, for example. For the seal lid 142, for example, a laminate including a resin having a barrier property or an aluminum foil is used. The first body 110 may not use a sheet material having a barrier property. For example, paper can be used as the sheet material. Alternatively, the sheet material may have a layer that can be fused like PE / paper from the outside to the inside of the packaging container 100.

  Thus, the packaging container 100 has a double structure in which the second body 120 sealed by the bottom part 130 and the lid part 140 is housed and protected in the first body 110 and has a hollow part. Furthermore, since the peripheral edge portion of the bottom portion 130 is protected by the bottom side outer curl 121, the shape retaining property, the heat retaining property, and the cold retaining property are excellent. Further, by using a material having a barrier property, the sealing property of the accommodating portion 150 is enhanced, and particularly excellent as a container for food and beverages. In addition, when the packaging container 100 is a container that is heated in a microwave oven, the first body 110 is not extremely heated even if the second body 120 becomes high temperature due to the double structure. High safety. Moreover, since the 1st trunk | drum 110 is protected by the 2nd trunk | drum 120, as long as the content can be accommodated appropriately, paper thinner than the conventional paper container can be used.

FIG. 2 shows the movement of the valve, showing an example of the check valve 3 used in the packaging container of the present invention.
FIG. 2-1 shows a balanced state in which the pressure inside the packaging container and the outside of the packaging container immediately after the contents are stored are the same.

By the way, when the content is coffee, carbon dioxide gas is generated from the roasted coffee beans and fills the inside of the container, so the whole container swells and thin parts etc. are deformed to the outside Occurs. Similarly, in the case of fermented foods such as miso and natto, carbon dioxide gas is generated when the yeast is alive. In addition, water vapor is also generated from food immediately after cooking, causing problems due to gas generated inside the food packaging container, such as condensation and softening.
FIG. 2-2 shows a state in which the internal pressure of the container is increased by the gas generated from the stored contents, and the rubber of the built-in valve 32 is pushed and opened. The valve 32 is opened, and the internal gas flows through the gap and is discharged out of the packaging container.

FIG. 2-3 shows the valve 3 when the gas inside the container is exhausted, the pressure is released, and the internal pressure and the external pressure become the same.
The rubber of No. 2 returns to its original position by its restoring force, and further, the silicone oil 33 filled around the valve increases its sealing performance and blocks the inside and outside of the packaging container.
In this way, depending on the contents, a packaging container is required that uses the backflow prevention valve 3 to discharge the generated gas or moisture.

As shown in FIG. 3, the surface to which the check valve is attached may be provided on the bottom 130 (FIG. 3-1) or the second body 120 (FIG. 3-2) as shown in FIG. 3.
However, when the content is liquid, there is a concern that the content itself may be exposed to the outside.
Moreover, as shown in FIG. 3-2, when the backflow prevention valve 3 is provided in the 2nd trunk | drum 120, since there is no small hole 31 visible outside, it is good in appearance. In this case, the generated gas flows in the gap 113 between the second barrel 120 and the first barrel 110, but the gap 113 swells as it is, and the pressure in the gap 113 becomes high. The generated gas will not be discharged.
Therefore, it is preferable that the first body 110 is made of a material having high gas permeability so that the generated gas permeates out from the first body 110. For example, a method of providing only a paper portion of the base material, providing holes in the front and back coating layers, or coating with a material having high permeability to the internally generated gas can be considered.

As shown in FIG. 4, the backflow prevention valve 30 provided in the bottom part 130 or the second body part 120 may be attached with a backflow prevention valve 30 whose mounting position is changed.
The backflow prevention valve 30 in which the mounting position is changed includes a filter for preventing the outflow of contents on the inner side, a mounting flange is provided on the inner housing, and the flange for mounting is spread in a disk shape. A large hole is formed in the wall of the container to be attached in the size of the check valve main body, and the hole is attached to the inner surface side of the hole. Therefore, the valve body portion of the backflow prevention valve 30 whose mounting position has been changed is in a state of protruding to the outside of the wall.
However, even if it is provided on the bottom 130 (FIG. 4-1) or the second body 120 (FIG. 4-2), it does not stand out or is not visible in appearance. Even the valve 30 can be employed.
When the second body 120 (FIG. 4-2) is provided, the first body 110 is made of a material having high gas permeability so that the generated gas permeates from the first body 110 to the outside. It is necessary as well.

The packaging container 100 of the present invention can be manufactured by a highly productive method. The chart of the manufacturing process of the packaging container 100 which concerns on FIG. 6 at this embodiment is shown, and details are described below.
(Step S1) A rectangular first sheet material is prepared.
The first sheet material is, for example, a sheet material having a layer structure of paper or PE / paper.
The first sheet material is rolled into a cylindrical shape, one side edge and the side edge opposite to each other are overlapped with each other, and the overlapping portion is bonded to form the first body 110.
The first sheet material may have a notch formed by notching at least one location on the bottom 130 side of the corner portion. By forming the notch, the position of the notch becomes a trigger for bending when forming the bottom side curl 111 described later, and the formation becomes easy.
Adhesion can be performed with an adhesive such as a hot melt adhesive, or when a resin such as PE is laminated on both the front and back surfaces of the first sheet material, it can also be performed by thermal welding or ultrasonic welding. .

(Step S2) A rectangular second sheet material is prepared.
The second sheet material is a sheet material having a layer structure including, for example, PE / paper / PE / GL (silicon oxide vapor deposition film) / PE.
One side edge or both side edges of the second sheet material are protected by a skive hemming process, an edge protection tape or the like. A sheet in which an edge protection tape such as a PE tape is attached to the end face of the roll paper may be cut into a rectangular shape to form the second sheet material. Further, in the second sheet material, as in the first sheet material, a notch is formed in at least one of the corner portions on the bottom 130 side, and the bottom side outer curl 121 described later is formed. The formation of the bottom side outer curl 121 may be facilitated by using the position of the notch as a trigger for bending.

(Step S3) The second sheet material whose end face is protected is rolled into a cylindrical shape having an outer diameter smaller than the inner diameter of the first body 110, and one side edge and the side edge opposite to each other are overlapped with each other to overlap each other. Are bonded by an adhesive, heat welding or ultrasonic welding to form the second body 120. The outer diameter of the second body 120 is formed smaller than the inner diameter of the first body 110.
When installing the backflow prevention valve 3 in the 2nd trunk | drum 120, the small hole 31 for a backflow prevention valve is opened previously in the 2nd sheet | seat material, and the backflow prevention valve 3 is attached to the inner surface. For attachment, methods such as hot melt adhesive and heat fusion can be employed.
In this case, it is preferable that the first sheet material is a more breathable material. For example, it is a sheet material having a paper or PE / paper layer structure. In the PE / paper structure, a fine hole is formed in the PE layer, or in the case of paper, the surface coat is made thin. The surface coat layer may be partially thinned.

  (Step S <b> 4) Among the open ends of the second body 120, the open end on the bottom 130 side is pressed with a mold while being heated and bent outward to form the bottom-side outer curl 121. The bottom side outer curl 121 is formed by, for example, folding the second sheet material without winding it. In addition to this example of the open end treatment, the bottom side outer curl 121 may improve the strength by forming the curl one or more times. Further, the open end treatment may be formed by crushing the curl so as to form a flange having a flat surface, thereby increasing the degree of adhesion with the bottom 130 and enhancing the protection effect of the bottom 130.

(Step S5) A bottom sheet material is prepared. The bottom sheet material is, for example, a sheet material having a layer configuration of paper / PE / GL / PE. The bottom sheet material is punched in accordance with the outer shape of the bottom side outer curl 121 of the second body 120 to form the bottom portion 130.
When the backflow prevention valve 3 is installed in the bottom portion 130, a small hole for the backflow prevention valve is opened in the bottom sheet material, and the backflow prevention valve is attached to the inner surface. For attachment, methods such as hot melt adhesive and heat fusion can be employed.

  (Step S <b> 6) The peripheral edge portion of one surface of the bottom portion 130 is bonded to the entire circumference of the bottom side outer curl 121. Adhesion is performed by heat welding or ultrasonic welding.

  (Step S7) A hot melt adhesive is applied to the peripheral portion of the other surface of the bottom portion 130. Thereafter, the second body 120 to which the bottom 130 is bonded is inserted into the first body 110.

(Step S8) A ring 141 is prepared.
A ring 141 is fitted to each open end of the first body part 110 and the second body part 120 on the lid part 140 side. After the ring 141 is fitted to the open end of each barrel portion, the inner ring portion and the entire circumference of the open end of the second barrel portion 120 are bonded together by ultrasonic welding. At this time, the ring 141 and other portions of the body portions may be further bonded. In addition, the enclosure of the content in the accommodating part 150 is performed between this step S8 and the following step S9, for example.

(Step S9) Among the open ends of the first body portion 110, the open end on the bottom portion 130 side is pressed with a mold while being heated and bent inward, and as shown in the vertical cross section shown in FIG. 111 is formed. The bottom side inner curl 111 is formed by winding a curl one or more times. However, the shape of the bottom side inner curl 111 is not limited to this, and it may be formed by folding the first sheet material without winding it, and the curl is crushed so as to form a flange shape having a flat surface. It may be formed. Thereafter, the peripheral edge portion of the other surface of the bottom portion 130 to which the hot melt adhesive is applied in Step S7 is pressure-bonded to the bottom side inner curl 111 of the first body portion 110 to be bonded. The bottom 130 may be adhered to the entire circumference of the bottom-side inner curl 111 or may be partially adhered.

FIG. 7 is a cross-sectional view showing the filling of the contents, the manufacture of the lid 140, and the process of sealing the lid to the packaging container manufactured up to step S9.
First, the seal lid 142 is prepared. The seal lid 142 is a film having a barrier property, and is formed of resin, aluminum foil, or the like.
As shown in FIG. 7A, the small hole 31 for the backflow prevention valve is opened in the seal lid 142.
7-2, the backflow prevention valve 3 is attached to the inner surface of the seal lid 142. For attachment, methods such as hot melt adhesive and heat fusion can be employed.
7-3, the outer shape of the seal lid 142 is removed.
At this time, as shown in FIG. 7-4, a tab 143 that protrudes from one end of the outer periphery of the seal lid 142 is provided, and the fused seal lid 142 is peeled off from the ring 141 to open the packaging container 100. It is good to be.
7-5 is a packaging container composed of a body part and a bottom part without the seal lid 142, which is the packaging container shown in the manufacturing process of FIG. The contents are filled here. The contents are attached to the ring 141 so that the fusion is not hindered.
In FIG. 7-6, the lid 140 having the backflow prevention valve 3 attached to the seal lid is aligned with the ring 141. In FIG. 7-7, the peripheral edge of the seal lid 142 is thermally welded to the top surface of the ring 141. The holes of the ring 141 are covered with the seal lid 142. Thereby, the cover part 140 is added and manufacture and filling of the packaging container 100 are completed.

  Through the above steps, the packaging container 100 shown in FIG. 1 can be manufactured. Each step may be changed as appropriate or the order may be exchanged.

  The manufacturing method as described above eliminates the need for complicated processing of sandwiching the peripheral edge of the bottom portion at the end of the body portion as in the prior art, and eliminates the need for supplying a roll because a spiral paper tube is not created. Therefore, the manufacturing cost can be reduced as compared with the conventional case, and packaging containers having various calibers and heights can be provided at low cost even in a small lot.

(Second Embodiment)
FIG. 8 is a diagram schematically showing a longitudinal section of the packaging container 200 according to the present embodiment. The description will focus on the differences between the present embodiment and the first embodiment. The same reference numerals are assigned to the same components.

The packaging container 200 is different from the lid part 140 of the packaging container 100 in the lid part 240. Further, the lid body side inner curl 112 is formed in the first body part 110 by folding the open end on the cover part 240 side inward. The second body 120 is formed with a lid-side outer curl 122 by folding the open end on the lid 140 side outward. The lid portion 240 includes a top surface portion 241 in which the peripheral edge portion of one surface is bonded to the entire circumference of the lid portion side outer curl 122. The peripheral surface of the top surface portion 241 is protected by the lid-side inner curl 112 of the first body portion 110 on the other surface. In the example shown in FIG. 8, the lid-side inner curl 112 is formed by winding the open end of the first body 110 one or more times. The lid-side outer curl 122 is formed by simply folding the lid body-side outer curl 122 without involving the open end of the second body 120.
The first body 110 may be provided with a ruled line that is recessed in a linear shape. After use of the packaging container 200, it can be easily folded and discarded by folding along the ruled line. The ruled line may be a trigger for folding, and the shape is not particularly limited. The ruled line may be formed on the second body 120. In addition, you may provide the same ruled line also in the packaging container 100 of 1st Embodiment.

The top surface portion 241 has a hole, and the spout 4 is inserted into the hole as a planned opening portion that opens at the time of opening, and the flange of the spout 4 is bonded to the top surface portion 241 over the entire circumference. An outer thread is formed on the spout and is screwed with a cap formed with the inner thread. The packaging container 200 is opened by turning the cap and opening it. In addition, the packaging container 200 can be resealed by reattaching the cap after opening.
Of course, a cap in which the cap and the spout are connected by a hinge may be used, or a combination of a spout and a cap that is not a screw type but a stopper type may be used.

  The top surface portion 241 is preferably formed of a sheet material having a barrier property. For example, it is preferable to have a paper / PE / GL / PE layer structure from the outside to the inside of the packaging container 200. The spout 4 is preferably formed of a resin such as PE.

  The lid-side inner curl 112 may be located on the same side as the top surface 241 instead of the opposite side of the lid-side outer curl 122.

The manufacturing method of the packaging container 200 in the second embodiment shown in FIG. 8 will be described below with respect to the difference from the packaging container 100.
In the present embodiment, the ring 141 is not used.
The second body portion is formed by pressing the open end of the second body portion 120 on the side of the lid portion 240 while pressing it with a mold while bending the outer end portion of the second body portion 120, and bending the lid portion side outer curl 122. Form. In the present embodiment, the lid-side outer curl 122 is formed by simply diffracting once without involving the second sheet material. The shape of the lid-side outer curl 122 is not limited as in the case of the curls on the bottom side, and may be formed by winding the curl one or more times, and the curl is crushed so as to form a flange shape having a flat surface. May be formed.

  The top sheet material is, for example, a sheet material having a layer configuration of paper / PE / GL / PE. The top sheet material is punched in accordance with the outer shape of the lid-side outer curl 122 of the second body 120. Moreover, the hole of the spout 4 and the small hole 31 for the backflow prevention valve 3 are formed in the top sheet material.

First, a spout 4 and a backflow prevention valve 3 are prepared. The spout 4 is formed of a thermoplastic resin that can be fused to the inner surface of the lid, such as a linear low-density polyethylene resin or a high-pressure low-density polyethylene resin. As the cap screwed into the spout, for example, PE, polypropylene, olefin resin such as polymethylpentene, acrylonitrile / butadiene / styrene resin, acrylonitrile / styrene resin, and the like can be considered.
The spout 4 and the backflow prevention valve 3 are inserted into the hole of the top surface sheet material, and the flange formed on the spout 4 is extended over the entire circumference, and in the backflow prevention valve 3, the top surface portion 241 is extended over the periphery of the small hole 31. Adhere by sonic welding. Hot melt adhesive or heat fusion may be used.

  The peripheral edge portion of the top surface portion 241 is bonded to the entire circumference of the lid portion side outer curl 122 of the second body portion 120 by heat welding. As described above, the spout 4 is not directly bonded to the second body portion 120 but is bonded to the top surface portion 241, so that the diameter of the spout 242 can be made smaller than the diameter of the second body portion 120. It is possible to facilitate adhesion by welding. In addition, the enclosure of the content in the accommodating part 150 is performed immediately before this process, for example.

Among the open ends of the first body 110, the open end on the lid 240 side is pressed with a mold while being heated and bent inward to form the lid-side inner curl 112. The lid side curl 112 is formed at a position that holds the peripheral edge of the top surface 241. In the present embodiment, the lid side curl 112 is
The first sheet material is formed by being wound one or more times. The shape of the lid-side inner curl 112 is not limited, as is the case with the other curls, and may be formed by simply diffracting the first sheet material so that the flange shape has a flat surface. The curl may be crushed and formed. The top surface portion 241 and the lid portion side curl 112 may or may not be bonded.
Each step may be changed as appropriate or the order may be exchanged.

  The packaging containers 100 and 200 may further include a shrink film, a paper tube, or the like. These cover, for example, portions including the lid portions 140 and 240 and the end portion of the first body portion 110 on the lid portion side, and function as a protective lid that protects the lid portion. The protective cover made of paper is manufactured, for example, by rolling rectangular paper into a cylindrical shape, and hot-melt bonding a top plate to one open end to close the open end.

FIG. 9 shows a longitudinal sectional view of a packaging container 300 according to still another modified example of the present invention.
In the packaging container 100 according to the first embodiment, the packaging container 300 is configured such that the ring 141 is fitted so that the outer ring portion contacts the inner surface of the first body 110, and the peripheral portion of the top surface of the ring 141 A lid-side inner curl 112 is formed at the lid-side open end of the first body 110 so as to hold down, and a seal lid 142 is bonded over the entire top surface of the lid-side inner curl 112. The packaging container 300 can be manufactured by appropriately changing the manufacturing method in each of the above-described embodiments.

The present invention is not limited to the above-described embodiment, and can be implemented by appropriately changing the shape, position, and size of each component according to the design of the properties of the contents, the function of the packaging container, the design, etc. It is. Instead of the spout, a hole (for content pouring) 144 with a peelable release film 41 (FIG. 9) attached thereto may be used. When the seal lid 242 is a paper substrate, the hole 144 needs to be edge protected.
Furthermore, the entire top surface portion may be a large spout that is injection-molded, and the base of the spout may have the shape of the ring 141 so that it can be integrally bonded.
In addition to such modified examples, various shapes such as a lid, a spout, and a drinking mouth can be implemented.
Further, the material of each component and the bonding method are not limited to those described above, and can be changed as appropriate. The present invention can be applied even when paper is not a main material.

The packaging container according to the present invention is as described above. In the cylindrical packaging container that allows the gas generated from the contents to be efficiently discharged by providing the backflow prevention valve 3 on the wall of the packaging container, the bottom 130 and The second body part 120 sealed by the lid part 140 is housed and protected in the first body part 110 to form a double structure having a hollow part, and the peripheral part of the bottom part 130 also has a bottom side outer curl. 121 is protected. For this reason, by using a material having excellent shape retaining property, heat retaining property and cold retaining property and having a barrier property, the sealing property of the accommodating portion 150 is enhanced, and particularly excellent as a container for foods and beverages.
Furthermore, when the packaging container is heated in a microwave oven, the first barrel 110 is not very hot even if the second barrel 120 becomes high temperature due to the double structure. .
Since this packaging container has a double structure, the price of the container rises, but a highly productive manufacturing method is possible, the body is doubled, the strength is high, and it is thinner than the conventional paper container Price increase can be suppressed by using paper.
As described above, the packaging container of the present invention is a container with great merit.

100, 200, 300 ... packaging container 11 ... barrel 110 ... first barrel 111 ... ··········································································· (Gap between the second body)
120... ········ Second barrel 121 ······································································· Side curl 13 ......... Bottom material 130 ......... Bottom 131 ... ... Peripheral edge (bottom Material)
14 ... Lid 140, 240, 340 ... Lid 141 ... Ring 142 ... ··························································· hole
150 ··································································································· ······································································································································
32 ... Valve 33 ... Silicone oil 4 ... Spout 41 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Peeling film

Claims (8)

A first body made by rounding the first sheet material, overlapping both side edges, and bonding the overlapping parts into a cylindrical shape;
Rounding the second sheet material, overlapping both side edges with each other, bonding the overlapping parts into a cylindrical shape, and a second barrel inserted into the first barrel,
A bottom and a lid for sealing the two open ends of the second body, respectively;
The bottom end side curl is formed by folding the open end on the bottom side of the first body portion inward,
A bottom-side outer curl is formed by folding the open end on the bottom side of the second body portion outward;
The bottom part is a packaging container that is bonded to the entire circumference of the bottom side outer curl at a peripheral part of one surface, and is bonded to at least a part of the inner curl of the bottom part at the peripheral part of the other surface,
A packaging container characterized in that, in part, a backflow prevention valve capable of discharging gas is provided outside the container. The lid is
A ring that is fitted to the open ends of the first body portion and the second body portion on the lid side and is bonded at least to the entire circumference of the open end of the second body portion on the lid side;
The packaging container according to claim 1, further comprising: a seal lid having a peripheral edge bonded to the entire circumference of the ring and covering the ring. The inner end curl is formed by folding the open end of the first body portion on the lid side inward,
The lid portion side outer curl is formed by folding the open end of the second body portion on the lid portion side outward,
2. The packaging container according to claim 1, wherein the lid part includes a top surface part whose peripheral part is bonded to at least the entire circumference of the lid part side outer curl and sandwiched between the lid part side outer curl and the lid part side inner curl.   The packaging container according to any one of claims 1 to 3, wherein the top surface portion has a planned opening portion that is opened when the packaging container is opened.   The packaging container according to any one of claims 1 to 4, wherein a backflow prevention valve is provided in the lid portion.   The packaging container according to any one of claims 1 to 4, wherein a backflow prevention valve is provided at the bottom.   The packaging container according to any one of claims 1 to 4, wherein a backflow prevention valve is provided in the second body portion.   The packaging container according to claim 7, wherein the first body portion has air permeability.

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