JPH03111249A - Airtight corrugated fiberboard container and manufacturing method thereof - Google Patents

Abstract

PURPOSE:To contrive the improvement of container assembly efficiency by a method wherein face material is pulled out from side edges to be formed into seal pieces and one seal piece is attached to the other facing seal piece or the face material to assemble a container. CONSTITUTION:After forming a corrugated fiberboard into a square tubular shape, front and rear flaps 20 are closed, while folding pieces 11 are being tucked in, and a hutt seam joint is made between seal pieces 6 facing each other, after which both the seal pieces 6 are bonded together with the heat sealable films 16 melted by heat application. The bonded seal pieces 6 are then bent in one direction as shown by the arrow and secured in place with an adhesive tape 21. By merely bonding a face material 5 to the corrugated fiberboard structure in this way, the seal pieces 6 can be provided and the trouble of removing an insert can be saved, whereby container assembly efficiency can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to an airtight container made of cardboard and a method for manufacturing the same.

[Conventional technology]

Conventionally, this type of airtight container devised by the present inventor has already been granted a utility model patent as Publication of Utility Model Publication No. 61-28756.

The main content is to use corrugated cardboard with plastic heat-sealed film attached to at least one side, and to form a sealing piece with the center core removed and the front and back liners bonded to the corrugated cardboard. When assembling the box,
The opposing seal pieces are adhered to each other by thermal welding of a heat-adhesive film, and the adhesive seal portion is bent so as to face down on the container wall.

When the cardboard box is constructed in this way, when the seal pieces are heat-welded together with the film, the heat is not easily transmitted to the film, and by instant bonding, it is possible to not only increase the efficiency of the assembly process, but also Since the sealing piece is a flexible piece without a core, it has the advantage of very good adhesion.

In addition, it is possible to eliminate the core of corrugated cardboard by using a base paper that is narrower than the liner for the core when manufacturing corrugated board with a corrugating machine, but in reality, the seal pieces are This method cannot be used because it is necessary to cover the entire circumference or almost the entire circumference of the box shape of a corrugated box, so the center core of the periphery of the box shape is cut out after the box shape is made.

[Problem to be solved by the invention]

Therefore, according to the conventional airtight container as described above, in order to remove the core, the front and back liners that have already been bonded are peeled off from the core, and while the peeled liner is turned over, the core is removed to a predetermined size. The work is very difficult because the width of the box must be cut to the width of the box, and the work must be done around the entire circumference or almost the entire circumference of the box shape, so it takes a lot of effort to remove the center core. did.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, it is an object of the present invention to provide an airtight container that does not require removing the core in order to form a sealing piece, and a method for manufacturing the same.

[Means and effects for solving the problems] In order to achieve the above object, several inventions regarding airtight containers have been constructed as follows.

1) A planar body is pasted on at least one of the front and back sides of the corrugated cardboard structure, and a part of the planar body protrudes from the edge to form a part as a sealing piece,
The seal pieces were assembled by adhering them to opposing seal pieces or planar bodies.

When a corrugated cardboard airtight container is configured in this way, a sealing piece can be provided by simply pasting the planar body onto the corrugated cardboard structure, which eliminates the need to remove the core, increasing the efficiency of container assembly work. be able to.

Examples of corrugated cardboard structures include single-sided corrugated cardboard, double-sided corrugated cardboard, double-sided corrugated cardboard, and double-sided corrugated cardboard.

Further, as the planar body, a film, sheet, liner base paper, metal foil, etc. can be used.

Among them, general films (PE, P
Various films such as P, polyester, cellophane, nylon, etc.), functional films (freshness preservation film (FH film), dew-proof film, etc.).

Examples include films in which metal is vapor-deposited on the above films, films in which metal foil is laminated on the films, and films in which resin is composited to improve gas barrier properties.

Further, examples of the sheet include a synthetic resin sheet, cloth, and the like.

As for the liner base paper, the following types of paper alone can be considered.

01 Film laminated on paper" Films include general films and functional films. Functional films include FH film, dew-proof film, EVAL film (characterized by gas and moisture permeability), and Styro film. There are films etc.

■A PE film is formed on r-film and then laminated onto paper. Because it is PE, it can be heat-sealed using heat.

01 paper with a resin layer formed thereon, for example, PE laminated by the extrusion lamination method.'' This can also be heat-sealed if the resin layer is heat-fusible.

■“Paper with metal vapor-deposited and a resin layer formed on top” This has good gas barrier properties.

■“Paper laminated with metal foil and a resin layer formed on top” This also has good gas barrier properties.

01 paper combined with the above-mentioned materials.'' This is a configuration used, for example, in milk cartons.

Next, regarding the metal foil, aluminum foil, copper foil, stainless steel foil, etc. can be used. Moreover, if a heat-fusible resin layer is formed on these metal foils, heat sealing becomes possible.

2) In the above-mentioned airtight container, the cardboard structure is generally punched out in advance. There are various types.

In addition, the planar body is pasted on both the inside and outside of the box, or on one side, but if it is on the inside, cuts can be formed in the corrugated cardboard structure along the fold to make it easier to fold.
Furthermore, even if there is a notch, waterproofness is ensured by the planar body.

3) If the liner on the side of the corrugated cardboard structure on which the planar objects are pasted has a structure in which a waterproof layer is formed between the upper and lower sheets, the penetration of the adhesive of the planar object is prevented by the waterproof layer.

If a planar body is attached to the entire surface of a corrugated cardboard structure using starch glue, there are problems such as water penetration and weakening of the strength, and an imbalance of water between the inner and outer surfaces, causing warping. This problem can be solved by

4) If the box outer liner of the corrugated cardboard structure protrudes as a sheet and part of it becomes a sealing piece, the end of the flute of the corrugated cardboard structure will be sealed by adhering the sealing piece when the box is assembled. This prevents rainwater etc. from entering the flute.

5) The planar body may be attached only to the edge of the corrugated cardboard structure, and in that case, material is saved.

6) If the planar body is partially glued to the body (side wall) of a box-shaped container, it will be easier to store and seal depending on the contents stored in the box, and the packaging process will be simpler and more streamlined. There is an advantage that

7) When cutting tape is provided by cutting only into the corrugated cardboard structure, the box can be separated into upper and lower parts by tearing the cut tape and tearing the planar body, but since no cuts are made in the planar structure. , it is possible to prevent the contents from seeping out from the incision.

8) If the outer surface of the planar body is extensively waterproofed up to the sealing piece, its strength will not deteriorate even if the outer surface gets wet with liquid when liquid is poured inside.

Waterproofing methods include water-repellent finishing, resin lamination, a method of sandwich-laminating resin between upper and lower sheets of paper, resin coating, and a method of using synthetic paper.

Note that synthetic paper is paper impregnated with resin, and a water-resistant adhesive is used as the adhesive.

9) When the entire container is shrink-wrapped and filled with liquid, even if the liquid leaks, it will not leak outside, thereby doubly ensuring safety.

Next, for the airtight container made of cardboard, a sheet-like cardboard structure is manufactured using a corrugating machine, and the cardboard structure is previously formed into a box shape.

A wide planar body protruding from the edge of the box shape is formed, and the planar body is attached to at least one surface of the front and back sides of the box shape, and the protruding portion of the planar body is used as a seal piece. The above airtight container can be effectively manufactured.

〔Example〕

FIGS. 1 to 7 show one embodiment, and the corrugated board structure F is made of a core 1 made of corrugated cardboard and corrugated cardboard as shown in FIGS. 2 and 7. A double-sided corrugated board with front and back liners 2.3 bonded together is used, and a planar body 5 is attached to the outer surface of the back liner 3.
are pasted together, and the portion of the planar body 5 that protrudes from the box shape M forms a seal piece 6.7.

As shown in Fig. 6, the box type M is made by making a predetermined fold in two pieces of cardboard F, so that the wave traveling direction of the core 1 is horizontal, and a sealing piece 6.6.7.7 is attached to each end. is starting to bite.

The shape of the box-shaped M is approximately rectangular, and the folding pieces 11.11 connected to the upper and lower ends of the left and right side walls 10.10 have a trapezoidal shape whose upper side is between the left and right pairs of diagonal folding lines 13.13. Notch 14
is provided, and the planar body 5 seals that part.

In this case, the overlap of the thick corrugated cardboard structures F is reduced due to the cutout portions 14.

The folding piece 11 can be easily folded.

In this case, the planar body 5 is made by laminating a heat-sealed polyethylene film 16 on the outer surface of kraft paper 15.
This planar body 5 is adhered to the entire surface of the back liner 3.

Further, this embodiment can also be configured as follows.

That is, for example, the planar body 5 is formed by partially laminating kraft paper to the polyethylene film with seal pieces left on the top and bottom of the polyethylene film. The outer surface of the kraft paper of the planar body 5 thus formed is adhered to the entire surface of a box-shaped back liner 3 formed by punching (forming) double-sided or multi-sided cardboard in advance. This embodiment can also be configured as follows. In addition, when the kraft paper 15 constituting the planar body 5 is made of corrugated board paper, a cheaper corrugated board structure can be obtained by directly adhering it to the corrugated top side of a single-sided corrugated board.

In the case of the above structure, first, since the kraft paper 15 of the planar body 5 and the back liner 3 are both made of paper, they can be easily bonded together with an adhesive such as vinyl acetate. . Furthermore, the 6 portions of the seal piece are made of polyethylene film alone, which speeds up heat transfer.
When heat sealing the seal pieces 6 together, high speed sealing is possible. Furthermore, as shown in Fig. 4, even when the seal piece 7.7 is on the front liner 2 side of the container, the seal piece 7.7 itself does not have a paper layer, so the heat-welded seal can be applied as it is. It is possible.

To assemble the container, first assemble it into a rectangular tube shape, then fold in the folding pieces 11.11 and insert the front and rear flaps 20.2.
0, and align the opposing seal pieces 6.6 in a bow shape, then heat both seal pieces 6.6 to seal the heat-sealable film 1.
6 is bonded by heat-melting. Next, fold the adhesive seal piece 6.6 to one side as shown by the arrow in FIG.
Fasten with adhesive tape 21.

As for assembling the rectangular cylinder, as shown in Fig. 4, the seal pieces 7 and 7 at the side ends are folded back to the side of the sheet body 5 on one side wall, and the film is also heat welded to the outer surface of the side wall. It's glued.

In addition, regarding the adhesion of the sheet body 5 to the box shape, unlike the above embodiment, the sheet body 5 is partially adhered from the body part, that is, the side wall part of the box shape, and the sealing piece according to the present invention is attached. Depending on the items stored, packaging becomes very easy.
This allows for rationalization.

[Other Examples]

FIGS. 8 to 12 show other embodiments, and in FIG. 8, a planar body 5 is bonded to a single-sided corrugated board F, essentially making it a double-sided corrugated board.

In FIG. 9, planar bodies 5.5 are pasted on both sides of a single-sided corrugated board F, and both seal pieces 6.6 are adhered.

FIG. 10 shows an incomplete double-sided corrugated board F from which the - side liner is missing, and a planar body 5 which also serves as a liner on the missing side.

In FIG. 11, sheet bodies 5.5 which also serve as liners are pasted on both sides of an incomplete double-sided corrugated board F in which liners on both sides are missing, and both seal pieces 6.6 are adhered.

FIG. 12 shows a planar body 5 pasted onto one side of a double-sided corrugated cardboard F.

Next, FIG. 13 and FIG. 14 show another embodiment of the airtight container. A seal piece 6.7 is formed by pasting these together.

In this case, the container shown in FIG. 14 has left and right side walls 10.1.
At the upper end of 0, the deposited piece 1 is formed by diagonal fold line 13.13.
4a and 14a are formed. Then, while folding down the upper and lower seal pieces 6 and 7 laterally, the upper and lower deposition pieces 14a,
Fold 14a into the left and right side walls 10 and 10 respectively,
An airtight container can be made by applying a band such as a P-P band over the sealing piece 6.7, or by adhering the inner surface instead of the banding.

The airtight container described above is used for the following purposes.

1) It is suitable for containing liquids and powders, but it can be disposed of by incineration, especially when the inside becomes dirty and cannot be reused, such as when containing ink or paint.

2) Suitable for transporting live fish.

3) By using various functional films, for example, products that are sensitive to moisture can be completely sealed and the products can be safely transported and stored.

4) Maintaining the freshness of seafood and dried fish (blocking oxygen and moisture with Everfilm, etc.).

5) By placing an oxygen absorber in the container to create an oxygen-free condition, it is possible to prevent food from oxidizing and metal from rusting.

6) Containers filled with gas for transportation to maintain the freshness of fruits and vegetables.

7) Due to the airtightness, it is possible to improve the environmental conditions that maintain the effectiveness of the functional film.

8) Sealing of substances that dislike odors and improving odor retention to retain odors.

〔Effect of the invention〕

From what has been explained above, the present invention has the following effects.

1) A planar body is pasted on at least one of the front and back sides of the corrugated cardboard structure, and a part of the planar body protrudes from the edge to form a part as a sealing piece,
Since the seal pieces facing each other are assembled by adhering them to the planar body, the seal pieces can be provided by simply pasting the planar bodies onto the corrugated cardboard structure, and there is no need to remove the core. Since this can be omitted, the efficiency of container assembly work can be improved.

2) The box shape of the airtight container is formed by molding, and the box shape ensures airtightness even if there are cuts in the cardboard structure.

3) If the liner on the side of the corrugated cardboard structure on which the planar objects are pasted has a structure in which a waterproof layer is formed between the top and bottom sheets, the penetration of the adhesive of the planar object is prevented by the waterproof layer. , the occurrence of warping can be prevented.

4) If the box outer liner of the corrugated cardboard structure protrudes as a sheet and part of it becomes a sealing piece, the end of the flute of the corrugated cardboard structure will be sealed by adhering the sealing piece when the box is assembled. This prevents rainwater etc. from entering the flute.

5) The planar body may be attached only to the edge of the corrugated cardboard structure, and in that case, material is saved.

6) When a cut tape is provided by cutting only into the corrugated cardboard structure, the box can be separated into upper and lower parts by cutting the cut tape into pieces and tearing the planar body, but since there is no cut in the one planar structure. , it is possible to prevent the contents from seeping out from the incision.

7) If the outer surface of the planar body is extensively waterproofed up to the sealing piece, its strength will not deteriorate even if the outer surface gets wet with liquid when liquid is poured inside.

8) When the entire container is shrink-wrapped and filled with liquid, even if the liquid leaks, it will not leak outside, thereby doubly ensuring safety.

Next, for an airtight container made of cardboard, a corrugated cardboard is manufactured using a corrugate machine, the cardboard structure is punched out into a box shape, a wide planar body protruding from the edge of the box shape is formed, and the planar shape is The above-mentioned airtight container can be effectively manufactured by attaching the body to at least one side of the front and back sides of the box-shaped body and using the protruding portion of the sheet body as a sealing piece.

[Brief explanation of drawings]

Figures 1 to 7 show one embodiment; Figure 1 is a perspective view of an airtight container, Figure 2 is a sectional view of a cardboard box, and Figure 3 is a first embodiment.
Figure 4 is an enlarged sectional view taken along the line B-B in Figure 1, Figure 5 is a perspective view of the airtight container showing the assembly procedure, and Figure 6 is a box-shaped container. FIG. 7 is an explanatory diagram of the cardboard. FIGS. 8 to 12 are explanatory diagrams of cardboard boxes showing other embodiments, respectively. FIGS. 13 and 14 show other embodiments, with FIG. 13 being a plan view of a box-shaped container, and FIG. 14 being a perspective view of an airtight container. F...Cardboard structure M...Box shape 1...Center core 2. 3... Liner 5... Planar body 6. 7... Seal piece 16... Heat welding film patent applicant Hiroyasu Nagata, patent attorney Isamu Tsuneda procedural amendment

Claims (1)

[Claims] 1) A planar body is pasted on at least one of the front and back sides of a corrugated cardboard structure, and a part of the planar body is made to protrude beyond the edge, thereby forming a part as a seal piece. death,
An airtight container made of cardboard assembled by adhering seal pieces to opposing seal pieces or planar objects. 2) The corrugated cardboard airtight container according to claim 1, wherein the corrugated cardboard structure is in the shape of a pre-molded box. 3) The corrugated cardboard airtight container according to claim 2, wherein a sheet body is partially adhered to a molded box-shaped body (side wall). 4) An airtight container made of corrugated cardboard according to any one of claims 1 to 3, wherein the liner on the side of the corrugated cardboard structure on which the planar bodies are bonded forms a waterproof layer between the upper and lower sheets. 5) The corrugated cardboard airtight container according to any one of claims 1 to 4, wherein the box outer liner of the corrugated cardboard structure protrudes as a planar body, and a part thereof serves as a sealing piece. 6) An airtight container made of corrugated cardboard according to any one of claims 1 to 4, wherein the sealing piece is formed by bonding the planar body only to the edge of the corrugated cardboard structure. 7) The corrugated cardboard airtight container according to any one of claims 1 to 6, wherein a cut tape is provided on the corrugated cardboard structure by a cut that does not reach the planar body in the body of the container for opening. 8) An airtight cardboard container according to any one of claims 5 to 7, wherein the outer surface of the planar body is waterproofed down to the sealing piece. 9) An airtight cardboard container according to any one of claims 1 to 8, wherein the entire container is shrink-wrapped with a heat-shrinkable film. 10) Manufacture a sheet-like corrugated structure using a corrugating machine, shape the corrugated structure into a box shape in advance,
Made of corrugated cardboard that forms a wide planar body that protrudes from the edge of the box shape, adheres the planar body to at least one surface of the front and back of the box shape, and uses the protruding part of the planar body as a sealing piece. Method of manufacturing airtight containers.