JP2001180645A - Paper-made simple container and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper-made simple container comprising a drawing container which is not deformed by a force applied in a peripheral direction to the container by a weight of contents when an end of the container is held. SOLUTION: The drawn container 16 made by drawing a sheet 10 has, in particular, a folded part 17 on a barrel stuck by thermowelding laminate films 12, 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple paper container and a method for manufacturing the same, and more particularly, to a simple paper container formed by drawing a flat sheet mainly composed of paper and a method for manufacturing the same.

[0002]

2. Description of the Related Art As a disposable simple container, for example, FIG.
A paper squeezing container as shown in FIG. In such a drawing container, for example, a paperboard punched in a disk shape is formed by drawing, whereby a portion on the outer peripheral side of the paperboard is squeezed to form a body portion. During the drawing, the outer peripheral portion of the paperboard is squeezed to obtain a container in which the folded portion 2 is formed in the body portion.

[0003]

SUMMARY OF THE INVENTION
Can be manufactured by drawing a single disk-shaped paper, and the number of constituents of the raw material is one, and the drawn container 1 can be formed only by the forming process. . Therefore, it becomes possible to provide a low-cost simple disposable container by such a structure or method.

However, in such a container, as shown in FIG. 11, when the contents are put in, the strength of the body portion in the circumferential direction is insufficient, and if the container has one end in the circumferential direction of the squeezed container 1, Due to the weight of the contents, the part of the container, particularly the folded part of the container, is deformed, which may cause the contents to spill. That is, such a squeezing container has a defect that it is easily deformed particularly when a circumferential force is applied to the body.

[0005] One way to overcome these drawbacks is to:
That is to process the peripheral portion of the upper opening of the squeeze container 1.
That is, a rim having an L-shaped cross section is formed on the edge of the opening by molding. Alternatively, curling may be formed at the opening edge by winding the opening edge outward or inside. Such processing of the opening edge makes it possible to prevent deformation to some extent when a radial force is applied.

However, as described above, since the squeezed container is a container in which the folded portion 2 is formed intermittently along the circumferential direction in the body portion, the thickness of the body portion is not uniform. In addition, there is a problem that it is very difficult to form a flange or a curled portion having an L-shaped cross section at the opening edge. Further, when such difficult processing is performed, there is a disadvantage that the cost of the container is increased, and the characteristics of the inexpensive simple container are lost. Even if such processing is performed, the strength in the circumferential direction does not always have a sufficient value due to the presence of the bent portion.

The present invention has been made in view of such problems, and a simple paper container and a method of manufacturing the same so that the container is not easily deformed even when a force is applied in the circumferential direction. The purpose is to provide.

[0008]

According to one aspect of the present invention, in a simple paper container formed by drawing a flat sheet made mainly of paper, a portion which is folded when squeezed and which overlaps is adhered. The present invention relates to a simple paper container.

Here, the sheet may be made of a sheet in which a laminated film is bonded to one or both sides of paper, and the laminated film may be heat-welded, folded, and the overlapping portions may be bonded. Alternatively, the sheet may be made of a sheet in which one surface or both surfaces of the paper are coated with a heat-sealing resin, and the folded portions and the overlapping portions may be bonded by the heat-sealing resin. Further, the sheet may be a flat sheet made of circular paperboard, and may be formed into a substantially cup-like shape by squeezing a portion on an outer peripheral side. The opening edge may be folded outward to form a flanged rim or curl.

[0010] The invention relating to the production method comprises a step of drawing a flat sheet mainly made of paper to form a container, and a step of bonding the portions which are folded and overlapped when drawn. The present invention relates to a method for producing a simple paper container provided.

Here, a laminate film may be bonded to one or both sides of the paper constituting the sheet, and the overlapped portions may be bonded by heat welding of the laminate film. Further, a heat-sealing resin may be coated on one surface or both surfaces of the paper constituting the sheet, and a portion which is folded and overlapped by the heat-sealing of the heat-sealing resin may be bonded. . Further, a bending line may be formed in advance on the flat sheet, and the sheet may be folded at the position of the bending line and drawn.

[0012]

According to the one aspect of the present invention, since the overlapped portion is folded and adhered when squeezed, the overlapped portion does not open even when a circumferential force is applied. As a result, deformation due to circumferential force can be prevented.

According to the invention relating to the manufacturing method, since the folded portion is overlapped when drawn and adhered, the folded portion is opened when a circumferential force is applied to deform the container. This makes it possible to stably manufacture a container that prevents such a situation.

[0014]

1 and 2 show a sheet 10 for manufacturing a simple paper container comprising a drawn container according to one embodiment of the present invention. As shown in FIG. 1, the sheet 10 has a circular shape according to the shape of the container finally obtained. As shown in FIG. 2, such a sheet 10 has a laminated film 1 on both sides of a paper 11.
2 and 13 are joined together. Various thermoplastic resins may be used as the laminate films 12 and 13, and for example, a film made of polyethylene or polypropylene may be used.

By drawing the sheet 10 having such a structure, a drawn container as shown in FIG. 3 is obtained. That is, the central portion of the sheet 10 shown in FIG.
By drawing the portion on the outer peripheral side of 0, a trunk portion on the outer peripheral side is formed.

As shown in FIG. 4, such a squeezing container 16 is configured such that its trunk portion is partially folded, and the trunk portion overlaps the folded portion 17. In the other portions, the body of the squeezing container 16 has the same single structure as the sheet 10.

The characteristic of such a squeezing container is shown in FIG.
As shown in FIG. 5, a portion 17 of the body of the squeezing container 16 which is to be folded is welded. That is, the folded portion 17 is crushed and the sheet 1
The heat-sealing is performed using the laminated films 12 and 13 bonded to the surface of the paper 11 of the paper No. 0, thereby bonding the folded portion 17. Therefore, once joined by heat welding, the folded portion 17 does not open even if a circumferential force is applied, thereby preventing deformation of the squeezing container 16, particularly the body portion, more reliably. It was done.

In the above embodiment, the laminated film 12 and the laminated film 13 are bonded to both sides of the paper 11 respectively, but the laminated film is not necessarily bonded to both sides of the paper 11 but bonded to one side. May be done. In the case of joining on one side, it is preferable to join the laminate film particularly to the outer peripheral portion of the container. According to such a configuration, at the portion where the outer laminate film is folded so as to be joined, the outer laminate film is bonded by heat welding with the laminate film.

Instead of bonding the laminate film to both sides or one side of the paper 11, it is also possible to use a sheet in which one or both sides of the paper 11 are coated with a heat-sealable resin. Also in this case, when the heat-sealing resin is coated on both sides of the paper, similarly to the above-described embodiment, the portion to be folded so that the inner heat-sealing resin is bonded and the outer heat-sealing resin. The sealing resin is welded and bonded at the portions to be folded so as to be joined. On the other hand, when a sheet coated with the heat-sealing resin only on the outer surface is used, the outer heat-sealing resin is joined by heat welding at the folded portion so as to be joined. Become. When a sheet in which the heat-sealing resin is coated only on the inner peripheral surface is used, the inner heat-sealing resin is joined by heat welding at the folded portion so as to be joined. .

The welding of the folded portion 17 of the body of the squeezing container 16 is performed as shown in FIG.
That is, the drawn container 16 is placed on the anvil 20, and the anvil 20 is slowly rotated by the rotary drive shaft 21. Then, the ultrasonic horn 22 is gently lowered,
By pressing against the body of the squeezing container 16, the laminated films 12 and 13 are melted by ultrasonic welding, and the folded portion 17 is thermally welded. Therefore, by such an ultrasonic welding method, the portion of the body of the drawing container 16 made of the paper 11 having the laminated films 12 and 13 bonded on both sides, and particularly, the portion 17 to be folded can be more reliably and extremely simplified. Can be thermally welded to

As described above, the squeezing container 16 of the present embodiment is
Is to bond a part 17 which is a part of the body part and is narrowed down to be doubled. That is, sheet 1
The heat welding is performed by using the laminated films 12 and 13 respectively bonded to both sides of the base paper 11 constituting the base paper 11. Here, the coating of the laminate films 12 and 13 may be performed by a method such as extrusion lamination, dry lamination, wet coating (blade, air knife coating, etc.).

The heat welding of the multiple folded portions 17 formed on the body of the drawing container 16 may be performed by an ultrasonic press as shown in FIG.
Alternatively, hot air may be used. Alternatively, it may be performed by a combination of an ultrasonic press and hot air or hot plate press. The heating or pressing conditions vary depending on the raw material sheet 10 used. In addition, the heater type welding that performs hot plate pressing is performed by using a laminated film 1 on the heater.
It is preferable to adopt a structure in which heating is performed in advance with hot air or a frame, and pressing is performed with a cold plate, because 2 and 13 are easily attached. In this respect, the ultrasonic welding method as shown in FIG. 6 is preferable because the laminated films 12 and 13 do not adhere to the horn 22.

Next, another embodiment will be described with reference to FIG. In this embodiment, a folding line 25 is formed in advance in a disk-shaped sheet 10 on an outer peripheral side portion which becomes a body portion when formed into a squeezed container.
In the state where the bending line 25 is formed, the sheet 1
When drawing 0 is performed, the bent line 25 portion is bent inward, and the area surrounded by the bent line 25 is multiplexed. Therefore, a simple container that does not deform even when a force is applied in the circumferential direction can be obtained by bonding the overlapping portions by such bending lines 25.

Still another embodiment will be described with reference to FIGS. In this embodiment, as shown in FIG. 8, a cup-shaped drawing container 16 is formed by drawing using a disk-shaped sheet 10. Here, the periphery of the upper opening of the squeeze container 10 is bent outward to form a flange-shaped rim 28. Moreover, even in such a flange-shaped rim 28, a simple container which is hardly deformed even when a force is applied in the circumferential direction is provided by bonding the overlapping portion during drawing.

FIG. 9 shows an apparatus for heat-welding the multiple bent portions of the flange-shaped rim 28 of the drawing container 16. That is, here anvil 2
9, the cup-shaped squeezing container 16 is placed in the recess 30, and the flange-shaped rim 28 is received on the upper surface of the anvil 29 at the periphery of the recess 30 of the anvil 29. In this case, the horn 31 is approached from above to ultrasonically weld the overlapping portion of the flange-shaped rim 28. Therefore, according to such a configuration, the strength against the circumferential direction in the portion of the flange-shaped rim 28 is further increased, thereby providing the squeezing container 16 that is more difficult to deform.

Although the present invention has been described with reference to the illustrated embodiments, the present invention is not limited to the above embodiments, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiment, a cup-shaped drawing container 16 as shown in FIG. 3 is formed by using a disk-shaped sheet 10 as shown in FIG. 1 or FIG. The present invention does not necessarily have to be a cup-shaped simple container, and can be applied to other various shapes of simple containers. For example, a tray-shaped container can be formed by using a substantially square or rectangular sheet and squeezing the outer periphery thereof. Further, in the above-described embodiment, the ultrasonic welding method is used for bonding the folded portion by heat welding. However, the present invention is not limited to such an ultrasonic welding method. It is not necessary to perform the bonding, and the bonding can be performed by various other methods. For example, the portions to be subjected to thermal welding may be melted using hot air or a hot plate so as to be bonded.

When a reinforcing deformation is applied to the outer peripheral portion, instead of the flange-shaped rim as shown in FIG. 8, various shapes such as an L-shape, a U-shape, and a rectangular cross-sectional shape are used. May be formed. Alternatively, the curl portion may be formed by winding the outer peripheral portion outward.

[0029]

According to one aspect of the present invention, there is provided a simple paper container formed by drawing a flat sheet made of paper as a main material.
When it is squeezed, it is folded and adheres to the overlapping part.

Therefore, even if a circumferential force is applied, the portion that is folded and overlapped when it is squeezed does not separate by bonding, thereby preventing the folded portion from opening and deforming the container. You.

The main invention relating to the production method includes a step of drawing a flat sheet mainly made of paper into a container shape, and a step of bonding a portion which is folded and overlapped when drawn. , Are provided.

Therefore, according to the manufacturing method having such a process, it becomes possible to stably produce a simple paper container which is hardly deformed by opening the folded portion even when a circumferential force is applied.

[Brief description of the drawings]

FIG. 1 is a plan view of a sheet for assembling a drawing container.

FIG. 2 is an enlarged longitudinal sectional view of a main part of the sheet.

FIG. 3 is an external perspective view of a formed drawn container.

FIG. 4 is an enlarged cross-sectional view of a main part of a body part of a seat.

FIG. 5 is an enlarged cross-sectional view of a main part in a state where a folded portion of a body of the container is adhered.

FIG. 6 is a perspective view of a main part of the ultrasonic welding device showing heat welding of the folded portion of the body of the container.

FIG. 7 is a plan view of a sheet for forming a drawn container according to another embodiment.

FIG. 8 is an external perspective view of a squeeze container according to another embodiment.

FIG. 9 is a longitudinal sectional view showing an apparatus for thermally welding a flange-shaped rim portion of the drawing container.

FIG. 10 is an external perspective view of a conventional drawing container.

FIG. 11 is an external perspective view showing a state where the squeeze container is used.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 sheet 11 paper 12, 13 laminated film 16 drawing container 17 part to be folded 20 anvil 21 rotary drive shaft 22 horn 25 bending line 28 flange-shaped rim 29 anvil 30 recess 31 horn

Claims (9)

[Claims] 1. A simple container made of paper, which is formed by drawing a flat sheet made of paper as a main material and drawn, wherein a portion which is folded and overlapped when squeezed is adhered. 2. The paper according to claim 1, comprising a sheet in which a laminated film is bonded to one or both sides of the paper, wherein the laminated film is heat-welded, folded, and the overlapped portion is bonded. Simple container. 3. A sheet formed by coating a sheet of paper with a heat-sealing resin on one or both surfaces thereof, wherein the heat-sealing resin is used to bond the folded and overlapping portions. Item 6. The simple paper container according to Item 1. 4. The sheet according to claim 1, wherein the sheet is a flat sheet made of circular paperboard, and the outer peripheral portion is narrowed and formed into a substantially cup shape. Simple paper container. 5. The simple paper container according to claim 1, wherein the opening edge is turned outward to form a flange-shaped rim or a curled portion. 6. A paper-made sheet comprising: a step of drawing a flat sheet mainly made of paper to form a container; and a step of bonding portions that are folded and overlapped when drawn. Manufacturing method for simple containers. 7. A sheet according to claim 6, wherein a laminate film is bonded to one or both sides of the paper constituting the sheet, and the overlapped portions which are folded by heat welding of the laminate film are adhered. For producing simple paper containers. 8. A heat-sealing resin is coated on one or both surfaces of the paper constituting the sheet,
7. A portion which is folded and overlapped by heat welding of the heat sealing resin is adhered.
Paper simple container according to 1. 9. The flat sheet according to claim 6, wherein a bending line is formed in advance on the flat sheet, and the sheet is folded at the position of the bending line and drawn. A method for producing the simple paper container described in the above.