JP3150680B2 - Cardboard airtight container - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an airtight container made of cardboard.

[Conventional technology]

Conventionally, as an airtight container of this kind, a device devised by the present inventor has already been obtained as a utility model right as Japanese Utility Model Publication No. 61-28756.

The main content is to use corrugated cardboard bonded to a plastic heat-sealing film on at least one side,
The joint part is formed as a seal piece with the core removed and the front and back liners adhered.In assembling a cardboard box, the opposing seal pieces are adhered to each other by heat welding of a heat welding film, and the bonding is performed. The seal portion is bent so as to face down on the container wall.

And when the cardboard box is configured in this way,
When the seal pieces are heat-sealed with the film, heat is easily transmitted to the film, and not only can the assembling work efficiency be improved by instantaneous bonding, but also the seal piece is a flexible piece with the core missing. Therefore, there is an advantage that the adhesiveness is very good.

Also, to remove the core of corrugated cardboard, it is possible to use a base paper narrower than the liner for the core when manufacturing corrugated cardboard with a corrugating machine, but in fact, the seal piece is Such a method cannot be used because it is necessary for the entire circumference or almost the entire circumference of the box shape of the cardboard box, and the center of the peripheral portion is cut off after the box shape is made.

[Problems to be solved by the invention]

Therefore, according to the conventional hermetic container as described above, in order to remove the core, the bonded front and back liners are peeled from the core, and the peeled liner is turned upside down to a predetermined size. It is very difficult to perform the work with the width of the box, and the work needs to be performed over the entire circumference or almost the entire circumference of the box. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an airtight container made of corrugated cardboard, which does not require a core to be formed in order to form a seal piece.

[Means and actions for solving the problems]

1) In order to achieve the above-mentioned object, the present invention provides a double-faced corrugated cardboard structure in which paper-made front and back liners are attached to the upper and lower sides of a corrugated paper core, and a sheet-like body is bonded to at least one surface. , A part of the sheet is protruded from the edge to form a part thereof as a seal piece, and the seal piece is bonded to the opposing seal piece or sheet to form an airtight cardboard assembly. In the container, the planar body is formed by laminating a plastic film or a plastic sheet or metal foil on paper, and the paper surface of the planar body and the paper liner surface of the corrugated cardboard structure are partially used with an adhesive. And partially bonded.

When the airtight container made of corrugated cardboard is configured in this way, a seal piece can be provided simply by pasting the planar body of the corrugated cardboard structure, and the trouble of removing the core can be omitted,
The efficiency of assembling the container can be improved.

In particular, since the sheet is partially adhered to the double-faced corrugated cardboard structure using an adhesive, the sheet is used only after the content is used or even when the content is reduced. It can be easily peeled off and removed from the double-sided cardboard structure.

Here, since the main body of the double-faced cardboard structure is a paper material, there is almost no problem of pollution when discarded or recycled. On the other hand, since the sheet-like body contains a plastic material or metal foil as a component in a considerable proportion, it must be specially treated so as not to cause a pollution problem.

For this purpose, it is desirable that both are easily separated and peeled off, but the partial adhesion according to the present invention can exactly meet this demand. Further, there is an advantage that the adhesive and the bonding operation can be rationalized, and the cardboard structure can be prevented from being warped as much as possible, so that the packaging operation can be performed very easily.

The partial adhesion is appropriately selected depending on the purpose of use of the container and the contents, such as point adhesion and line adhesion. Also,
As the adhesive, even a soft adhesive, a pressure-sensitive adhesive or the like which is easy to peel off is preferable depending on the use.

Examples of the double-sided cardboard structure include a normal double-sided cardboard, a double-sided cardboard, a double-sided cardboard, and the like.

Further, as the sheet, a sheet obtained by laminating a plastic film, a plastic sheet, or a metal foil on paper is used.

Among them, as plastic films, general films (PE, PP, polyester, cellophane, nylon, etc.)
Various films), functional films (freshness preserving film [FH film], anti-dew film, etc.), metal films deposited on the above film, metal foil laminated on the film, resin composite to enhance gas barrier properties And the like.

Further, examples of the plastic sheet include a cloth made of plastic.

Kraft paper, liner base paper, etc. can be used as paper. Furthermore, when the above-mentioned planar body is specifically exemplified, “a film obtained by laminating a film on paper” includes a general film and a functional film, and the functional film includes an FH film, a dew-proof film,
EVAL film (characterized by the permeability of gas and moisture) and styro film.

"A PE film is formed on a film and then laminated on paper." Heat sealing is possible because of PE.

"What formed a resin layer on paper, for example, what was obtained by laminating PE by an extrusion lamination method" Again, if the resin layer is heat-sealable, heat sealing is possible.

"A metal is deposited on paper and a resin layer is formed thereon". This has good gas barrier properties.

"What laminated a metal foil on paper and formed a resin layer thereon" This also has good gas barrier properties.

"A combination of the above with paper" This is the configuration used, for example, in milk cartons.

Next, as the metal foil to be laminated on the paper, an aluminum foil, a copper foil, a stainless steel foil or the like can be used. If a heat-welding resin layer is formed on these metal foils, heat sealing becomes possible.

In the above-mentioned hermetic container, the corrugated cardboard structure is generally punched in advance. Its type varies.

In addition, the planar body is bonded to both or one of the inside and outside of the box, but if it is inside, a cut can be formed along the crease in the corrugated cardboard structure to make it easy to break, and the cut can be made. Even if it is, waterproofness is ensured by the planar body.

2) When the liner on the side of the corrugated cardboard structure to which the sheet is bonded has a waterproof layer formed between the upper and lower papers, the permeation of the adhesive of the sheet is prevented by the prevention layer.

If the sheet is pasted on the outer surface of the corrugated cardboard structure with starch glue, the moisture will penetrate and the strength will be weakened.
There is a problem that the balance of moisture is lost between the inner and outer surfaces and warpage occurs, but this problem can be solved by the above means.

3) The sheet may be bonded only to the edge of the corrugated cardboard structure, in which case the material is saved.

4) If the outer surface of the sheet is extensively waterproofed up to the seal piece, the strength does not deteriorate even if the outer surface is wetted by the liquid when the liquid or the like is put therein.

Examples of the waterproofing include water repelling, resin lamination, a method of laminating a resin between upper and lower papers in a sandwich manner, a method of resin coating, and a method of using synthetic paper.

The synthetic paper is obtained by impregnating the paper with a resin, and a water-resistant adhesive is used as the resin agent.

〔Example〕

FIGS. 1 to 7 show an embodiment. As shown in FIGS. 2 and 7, a corrugated cardboard structure F is made of corrugated corrugated core 1 and corrugated cardboard as shown in FIGS. A double-faced cardboard in which the front and back liners 2 and 3 are bonded to each other is used, and a planar body 5 is bonded to the outer surface of the back liner 3, and the portion where the planar body 5 protrudes from the box M is a sealing piece 6. It is 7.

As shown in FIG. 6, the box type M is formed by making a predetermined crease in one piece of corrugated cardboard F so that the wave propagation direction of the core 1 is horizontal, and seal pieces 6, 6, 7, 7 at each end. Is protruding.

The shape of the box shape M is substantially rectangular, and the folding pieces 11, 11 provided continuously at the upper and lower ends of the left and right side walls 10, 10 have trapezoidal shapes having the upper side between the pair of left and right diagonal folding lines 13, 13. A notch 14 is provided, and the sheet 5 seals the portion.

In this case, the thick cardboard structure F
Since the overlap of the notches 14 is small, the folding pieces 11 can be easily folded.

In this case, the sheet 5 is made by laminating a polyethylene heat-sealing film 16 on the outer surface of the kraft paper 15, and the sheet 5 is partially adhered to the outer surface of the back liner 3 by partially using an adhesive. I have. 3 to 6, the kraft paper 15 and the film constituting the planar body 5 are shown.
16 is omitted, and is simply illustrated as a planar body 5.

This embodiment can also be configured as follows.

That is, for example, a kraft paper is partially laminated on the polyethylene film in a state where the sealing pieces are left and below the polyethylene film to form the sheet 5. An adhesive is partially applied to the outer surface side of the kraft paper of the sheet body 5 formed in this manner, and to a box-shaped back liner 3 formed by punching (forming) double-sided or double-sided cardboard in advance. This embodiment can also be constituted by using and partially bonding.

In the case of the above configuration, first, since both the kraft paper 15 and the back liner 3 of the sheet body 5 are made of paper, it is easy to partially bond them with an adhesive such as vinyl acetate. it can. Further, the seal piece 6 has a structure of the polyethylene film alone, so that heat is transmitted quickly, and high-speed sealing can be performed when heat sealing the seal pieces 6. Further, as shown in FIG. 4, even when the front liner 2 side of the container is the seal pieces 7, 7,
Since there is no paper layer on the seal pieces 7, 7, the seal can be directly formed by heat welding.

Regarding the assembly of the container, after assembling into a square tube shape,
The front and rear flaps 20 and 20 are closed while folding the folding pieces 11 and 11 so that the opposing sealing pieces 6 and 6 are arranged in a dovetail shape, and then both the sealing pieces 6 and 6 are heated to thermally melt the heat welding film 16. Glue by doing. Next, the adhesive seal pieces 6 and 6 are turned to one side as shown by an arrow in FIG.

As shown in FIG. 4, in the case of assembling a square tube, the sealing pieces 7, 7 at the side ends are folded back to the sheet body 5 side of one side wall, and the film is heated and welded to the outer surface of the side wall. Glued.

[Other embodiments]

FIG. 8 shows another embodiment, in which a sheet body 5 is bonded to one surface of a double-faced double-faced cardboard F.

Next, FIGS. 9 and 10 show another embodiment of the airtight container. In this case, a planar body 5 is provided at both upper and lower ends and one end of a box-shaped M made of a corrugated cardboard structure F. Are bonded to form seal pieces 6 and 7.

The container in this case shown in FIG. 10 has bent pieces 14a, 14a formed by oblique fold lines 13, 13 at the upper ends of the left and right side walls 10, 10. Then, the upper and lower seal pieces 6, 7 are folded horizontally, and the upper and lower folded pieces 14a, 14a are folded into the left and right side walls 10, 10, respectively.
An airtight container can be obtained by applying a band such as a P band or the like or by bonding the inner surface instead of the band.

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

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

2) Suitable for live fish transportation.

3) By using various functional films, for example, a product that dislikes moisture can be completely sealed, and the product can be safely transported and stored.

4) Preserving the freshness of fish and shellfish and dried fish (cut off oxygen and moisture by using an evaporative film or the like).

5) By putting an oxygen scavenger in a container to make it oxygen-free, it is possible to prevent food oxidation and metal rust.

6) Container for gas-filled and transported to maintain freshness of fruits and vegetables.

7) Due to airtightness, environmental conditions for maintaining the effect of the functional film can be improved.

8) Sealing of things that dislike "smell" and improvement of odor retention to keep "smell".

〔The invention's effect〕

As described above, the present invention has the following effects.

1) The seal piece can be provided simply by pasting the sheet to the corrugated cardboard structure, and the trouble of removing the core can be omitted, so that the efficiency of assembling the container can be improved.

In particular, since the sheet is partially adhered to the double-faced corrugated cardboard structure using an adhesive, the sheet is used only after the content is used or even when the content is reduced. It can be easily peeled off and removed from the double-sided cardboard structure.

Here, since the main body of the double-faced cardboard structure is a paper material, there is almost no problem of pollution when discarded or recycled. On the other hand, since the sheet-like body contains a plastic material or metal foil as a component in a considerable proportion, it must be specially treated so as not to cause a pollution problem.

For this purpose, it is desirable that both are easily separated and peeled off, but the partial adhesion according to the present invention can exactly meet this demand. Further, there is an advantage that the adhesive and the bonding operation can be rationalized, and the cardboard structure can be prevented from being warped as much as possible, so that the packaging operation can be performed very easily.

2) When the liner on the side of the corrugated cardboard structure to which the sheet is bonded has a structure in which a waterproof layer is formed between the upper and lower papers, the penetration of the adhesive of the sheet is prevented by the waterproof layer. , Warpage can be prevented.

3) The sheet may be bonded only to the edge of the corrugated cardboard structure, in which case the material is saved.

4) If the outer surface of the sheet is extensively waterproofed up to the seal piece, the strength does not deteriorate even if the outer surface is wetted by the liquid when the liquid or the like is put therein.

[Brief description of the drawings]

1 to 7 show one embodiment, FIG. 1 is a perspective view of an airtight container, FIG. 2 is a cross-sectional view of a cardboard, and FIG.
FIG. 4 is an enlarged sectional view taken along line AA, FIG. 4 is an enlarged sectional view taken along line B-B of FIG. 1, FIG. 5 is a perspective view of an airtight container showing an assembling procedure, and FIG. FIG. 7 is an explanatory view of a cardboard. FIG. 8 is an explanatory view of a cardboard showing another embodiment. 9 and 10 show still another embodiment. FIG. 9 is a plan view of a box type, and FIG. 10 is a perspective view of an airtight container. F: Corrugated cardboard structure, M: Box type, 1: Core 2, 3, Liner 5, Planar body 6, 7, Seal piece, 16: Heat-welded film

Claims (4)

(57) [Claims] 1. A double-faced corrugated cardboard structure comprising a corrugated paper core with a back and front liner attached to the top and bottom of the corrugated paper core. By extruding from the edge, a part thereof is formed as a seal piece, and in a corrugated cardboard airtight container assembled by bonding the seal piece to the opposing seal piece or sheet, the sheet is formed on paper. It is made by laminating plastic film or plastic sheet or metal foil,
An airtight container made of corrugated cardboard, wherein the paper surface of the sheet and the paper liner surface of the corrugated cardboard structure are partially bonded to each other by partially using an adhesive. 2. The airtight container made of corrugated cardboard according to claim 1, wherein the liner on the side where the sheet of the corrugated cardboard structure is bonded has a waterproof layer formed between the upper and lower sheets. 3. A seal piece is formed by bonding a planar body only to an edge of a corrugated cardboard structure.
Or the airtight container made of cardboard according to 2. 4. The airtight container made of corrugated cardboard according to claim 1, wherein the outer surface of the sheet is waterproofed up to the sealing piece.