JPH10157740A - Composite container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite container which is constituted of a cylindrical body with the bottom, made of a volume reduction plastic bottle and a cardboard and which is separable after use and adaptable for the environment. SOLUTION: This composite container is composed of a thin plastic bottle having a square cylindrical body and a cylindrical body C1, C2 with the bottom made of cardboard covering the body of the plastic bottle P1, P2. A fixing means is provided to integrally unit the body of plastic bottle and the cylindrical body with the bottom, at a specified position. The fixing means is a welding means with heat through a hot melt adhesive material or a heat sealant coated in spots on the inside face of the cylindrical body in advance. And the fixing thereof is carried out by fitting a protrusion N formed at least at one position on the ridge line of the plastic bottle body to a covering area M for the protrusion, formed at a part of the cylindrical body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to liquids such as beverages, seasonings, toiletries, pharmaceuticals, quasi-drugs, chemicals, etc.
The present invention relates to a container for quasi-liquids, powders, and granules, wherein the outer surface of a thinned plastic bottle is reinforced with a tubular paperboard.

[0002]

2. Description of the Related Art Conventionally, there have been a number of composite containers in which the amount of plastic used in plastic bottles is reduced for environmental protection to reduce the thickness, and the outer side is protected by a paperboard carton or tubular body (sleeve) to provide strength. Proposed. This composite container can be roughly classified into a plastic bottle and a tubular body made of paperboard integrated around the body of the plastic bottle by some kind of coupling means, and a plastic bottle and a carton joined together around the mouth and neck of the plastic bottle. There is something that has become. For example, Table 6
Japanese Patent Application Laid-Open Nos. 505949, 7-833 and 7-22968 propose the former type, and Japanese Utility Model Application Laid-Open No. 6-80668 proposes the latter type. Japanese Unexamined Patent Publication No. Hei 6-505949 proposes fixing a paperboard tubular body by providing a concave portion and a protruding portion on the side wall of a body of a plastic bottle as shown in FIG. As shown in FIG. 4 (b), Japanese Patent Laid-Open Publication No. Hei 7-833 discloses a plastic bottle in which thick portions are provided above and below the body of a plastic bottle, and the middle portion is thinned. It is wrapped with paperboard. further,
The one proposed in Japanese Utility Model Laid-Open Publication No. 6-80668 is
As shown in FIG. 4 (c), the carton is composed of three parts, the carton is joined at the neck of the thin plastic bottle, and the spout is thermally bonded thereon.

[0003]

However, means for fixing a paperboard tubular body around the body of a thinned plastic bottle is disclosed in Japanese Patent Application Laid-Open No. 6-505949. The body is provided with a concave portion or a convex portion, and in many cases the cylindrical body is locked at this portion, but it is effective when there is a certain level of rigidity on the plastic bottle side, but thinning progresses If stiffness is lost, this measure becomes totally ineffective. In other words,
There is a problem that there is a limit in reducing the thickness of this type of composite container. Further, the composite container proposed in Japanese Utility Model Laid-Open No. 7-833 is a recess fitting method in a broad sense, but has a problem in that since the upper and lower parts of the body are thick, the effect of reducing the amount of plastic cannot be expected. . In addition, there is a problem in that setting a tubular body requires a labeler-like device for winding a blank of the tubular body around a concave portion in the middle of the body. Further, in the case of the composite container proposed in Japanese Utility Model Laid-Open No. 6-80668, even though the thickness can be reduced, the operation of folding the folding flap at the upper end of the outer box into the constricted portion at the lower part of the mouth and neck portion. It takes a lot of time, and the separately prepared normal-thickness mouth and neck portion is attached to the bottle body later.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a thin plastic bottle having a prismatic body and a bottomed board made of paperboard covering the body of the plastic bottle. Provided with engaging means for integrating the body of the plastic bottle and the bottomed cylindrical body at a predetermined position, and the engaging means, via a hot melt adhesive, Alternatively, the inner surface of the tubular body may be heat-bonded via a heat sealant material spot-coated on the inner surface in advance, and the engagement unit may include:
At least one location on a ridgeline formed by intersecting adjacent side walls of the body of the plastic bottle,
A convex portion having a horizontal valley portion with a predetermined width in the middle and a portion of the cylindrical body covering the convex portion, and a horizontal portion that fits into the valley portion. The upper and lower two cut lines forming the belt-like portion and the convex portion covering region provided with a vertical cut line branching up and down along the ridge line from the cut line are formed by fitting. I do.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a perspective view of a composite container according to the present invention, FIG. 1 (a) is a perspective view of a composite container of Example 1 according to the present invention, and FIG. 1 (b) is a perspective view of Example 2 similarly. is there. The composite container 10 according to the first embodiment of the present invention includes:
As shown in FIG. 1A, a body of a thinned plastic bottle P1 is covered with a bottomed tubular body (hereinafter referred to as a carton) C1 and a predetermined portion selected from a portion in which both are in contact with each other. Are engaged with each other at the spot bonding portion S, which is the position of. This engagement position is theoretically arbitrary, but in consideration of workability and effects, the upper end portion where the plastic bottle has a certain thickness is more preferable. Further, as shown in FIG. 1 (b), the composite container 20 according to the second embodiment of the present invention has the plastic bottle P2 and the plastic bottle P2 on the ridge formed by the intersection of the adjacent side walls 11 and 12 of the body of the plastic bottle P2. Means for engaging with the carton C2 are provided, and their positions are indicated by M and N. This position is also arbitrary as long as it is on the ridge line, but a position having a certain thickness is preferable.

FIG. 2 is a development view of a carton blank of the composite container according to the present invention. As shown in FIG. 2A, the carton blank BL1 of the first embodiment of the composite container according to the present invention has four side wall panels 1 to 4 and a glue allowance 5 connected via folding lines a to d. Fold line e at the bottom of panels 1-4
The folding pieces 6 to 8 for forming the carton bottom are connected via the. The developed view of the bottom portion B is also used for a general paper container, and has a function of enabling the bottom portion to be formed by one-touch operation called "auto bottom". This auto bottom is not only a carton with a horizontal cross section square,
It is also applicable to rectangular cartons. Further, a spot bonding portion S is provided at an upper position of the blank BL1 at a position where the spot bonding portion is engaged with the bottle, and the spot bonding portion S is partitioned by perforations m. In this spot bonding portion, a heat sealant layer made of a polyolefin-based resin having a low-temperature sealing property may be provided in advance on the back surface of the carton. As shown in FIG. 2B, the carton blank BL2 of the composite container according to the second embodiment of the present invention
The side wall panels 11 to 14 and the glue allowance 15 are connected via folding lines a to d.
Through the main flaps 16 and the side wall panels 11 and 13
A sub-flap 17 is connected to the lower portion to form a carton bottom. Further, two upper and lower cut lines g, h having a predetermined width and forming a horizontal band-shaped portion E on the fold lines a, c are provided orthogonal to the fold lines a, c. And vertical cut lines i and j extending vertically along are provided. This portion covers the convex portion N of the plastic container described later, and is referred to as a convex portion covering region M. In FIG. 1, the convex portion covering region M is provided at two locations, but may be provided at any one location.

FIG. 3 is an explanatory view for assembling the composite container according to the first embodiment of the present invention. The molding of the carton C1 is performed in the following steps. First, the bottom flap of the carton blank BL1 is folded back to the body D side, and the whole is folded along lines a and c.
At the same time, paste the body with glue allowance 5,
The folding pieces 6 and 8 are also bonded at the positions indicated by the dots to form a flat folded carton. Next, this is caused to be a carton C1 as shown in FIG. At this time, since the bottom has an auto bottom structure, the bottom is automatically formed. Finally, the hot melt adhesive is partially coated on the spot-bonded portion S of the molded carton C1 or on the side of the side wall panel of the plastic bottle P1 where the spot-bonded portion S finally faces, and then the plastic bottle What is necessary is just to insert P1 into the carton C1 to a fixed position, and to engage both via a hot melt adhesive. Also,
After melting the heat sealant, which has been partially coated in advance, to the spot bonding portion S in a spot with hot air,
The plastic bottle P1 may be inserted so as to engage with both. Still further, after the plastic bottle P1 is inserted, the spot bonding portion S may be heated and bonded by pressing a heating rod from outside the carton. In this case,
As the heat sealant, a sealant having delayed tackiness having heat sensitivity can be suitably used. The position of the spot bonding portion S is preferably the upper end portion of the carton, which has a certain thickness in the plastic bottle so that both are surely in contact with each other and has good workability in coating the adhesive. Since the engagement at the spot adhesive portion S is only for the purpose of preventing the carton C1 from falling off from the plastic bottle P1, there is no need for strong adhesion, but rather, the paper and the plastic are easily separated after use. It is sufficient if they are adhered so that they can be separated. The filling of the internal solution into the composite container 10 of the first embodiment is performed after the combination.

FIG. 4 is an explanatory view for assembling the composite container according to the second embodiment of the present invention. As shown in FIG. 4 (a), a convex portion N is provided on a ridge formed by intersecting adjacent side wall surfaces of the body of the plastic bottle P2. The position of the convex portion N is arbitrary as long as it is on the ridge line, and the number of the convex portions N may be two or one as shown in FIG. The convex portion N is composed of an upper and lower convex portion 18 and an intermediate valley portion 19, and the upper and lower convex portions 18 are formed to be lower toward the end, and are at the same level as the trunk side wall surface. FIG. 4B is a perspective view of the carton C2 of the composite container according to the second embodiment of the present invention. The formation of the carton C2 is completed when the carton blank BL2 is attached to the body, the main flap 16 is turned back after the sub flap 17 for forming the bottom, and the main flaps are adhered together. This molding of the bottom may be after engagement with the plastic bottle P2. Next, the plastic bottle P2 is inserted into the molded carton C2 shown in FIG. 4B until the convex portion N and the convex portion covering region M match. This insertion may be performed from any of the upper and lower directions of the plastic bottle P2 as long as the bottom molding is performed later. When the plastic bottle P2 is inserted into the carton C2, the carton C
At the time when the two convex-shaped covering regions M overlap, the belt-shaped portion E is fitted into the valley portion 19 to actuate the engaging means, and the carton C2 is prevented from moving up and down and engaged with the plastic bottle P2. You. Immediately before the point of engagement, the belt-shaped portion E needs to climb over any of the upper and lower convex portions 18. However, since the plastic bottle P2 is thinned, at the time of overcoming this, the circumference of the body is tightened by external pressure, and the outer periphery is momentarily reduced slightly, so that the belt-shaped portion E can get over any of the upper and lower convex portions 18. , Can be fitted. FIG. 1 (b) is also a state diagram in which the carton C2 is engaged by this fitting, and a part of the carton C2 on the upper and lower convex portions 18 is slightly outwardly cut by the cut lines i and j. It will be open. The filling of the contents in the composite container 20 of the assembled second embodiment is performed after the assembly.

In order to strengthen the engagement between the carton C2 and the plastic bottle P2 in the composite container 20 of the second embodiment according to the present invention, the inner periphery of the carton C2 and the plastic bottle P
It is better to make the outer periphery of 2 as close as possible and to increase the number of fitting locations consisting of the convex portion N and the convex portion covering region M. In the case where a plurality of fitting portions are provided, the staggered positional relationship reduces the resistance during the integration work by insertion and facilitates the work, as compared with the case where the fitting portions are provided at the same level as shown in FIG.

[0010] Since the composite containers 10 and 20 according to the present invention are covered by the bottomed tubular body, only the body portion of the plastic bottle is compared with the conventional composite container covered by the tubular body (sleeve). Instead, the thickness of the bottom can be further reduced. In addition, the carton covering the bottom has an effect of increasing the drop strength. Separation of paper and plastic from a used composite container according to the invention is easy. That is, in the composite container 10 of the first embodiment, when the portion defined by the perforations m shown in FIG. 1A is torn off from the upper end with a fingertip, the spot adhesive portion S is peeled off, and the carton C1 portion is easily removed. Can be removed. Further, in the composite container 20 of the second embodiment, the plastic bottle P2
Can be easily removed by pulling it upward. Further, the apparatus for assembling the composite containers 10 and 20 according to the present invention requires less initial investment and is easy to be lined, as compared with an apparatus for winding a blank around a body like a labeler.

The capacity of the composite container to which the present invention is applied is 50.
It is about 0 to 2000 ml. Composite container 1 according to the invention
Cartons C1 and C2 of 0 and 20 can use almost all paperboards. Above all, a paperboard obtained by laminating recycled pulp to the back surface or the intermediate layer can be used sufficiently. When the paperboard has a basis weight of 1000 ml, for example, a coated ball having a basis weight of 200 to 300 gr / m ² can be suitably used. On the other hand, plastic bottles also have a wide range of materials, such as molded bottles made of thermoplastic resins such as HDPE, PP, PET, and PA, and PP / EVOH /
A bottle formed by multi-layer extrusion using a barrier resin as a part of a layer of PP or the like can be sufficiently used. Here, HDPE: high density polyethylene PP: polypropylene PET: polyethylene terephthalate PA: acrylonitrile copolymer EVOH: ethylene vinyl alcohol copolymer

By integrating or compounding the thinned plastic bottles P1 and P2 and the cartons C1 and C2 as described above, the amount of resin used can be reduced without extremely lowering the strength of the container. , After use, it is easier to perform incineration by separating and discarding,
Another advantage is that the plastic bottle after use can be easily reduced in volume by thinning. In some cases, recycling is possible. Further, beautiful printing can be performed on the entire surface of the carton blanks BL1 and BL2, and unlike the case of the conventional plastic bottle alone, it is possible to impart excellent decorative effects and appealing power to the product.

[0013]

According to the composite containers 10 and 20 of the present invention, the thinned plastic bottles P1 and P2 are inserted into the cartons C1 and C2 raised in the shape of a prism, and both are partially adhered or fitted. Can be easily integrated by just doing
Since the bottom portion is also covered with paperboard, the drop strength of the bottom portion can be increased, and the amount of plastic used can be reduced to less than half the conventional amount. After use, it can be separated into paperboard and plastic and discarded or recycled, reducing the environmental burden.
No special equipment is required to integrate the two. In addition, compared to conventional plastic containers, the printing space is expanded and printing can be performed using known printing techniques, so the degree of freedom, efficiency and beauty of printing are dramatically increased, and the design as a product As a result, it is possible to transmit a great deal of product information as a print medium to consumers.

[Brief description of the drawings]

FIG. 1 is a perspective view of a composite container according to the present invention.

FIG. 2 is a development view of the carton blank of the composite container according to the present invention.

FIG. 3 is an explanatory view for assembling the composite container according to the first embodiment of the present invention.

FIG. 4 is an explanatory view for assembling a composite container according to a second embodiment of the present invention.

[Explanation of symbols]

 1-4 Side wall panel 5 Glue allowance 6-8 Bottom formed folding piece 10 Composite container of Example 1 according to the present invention 11-14 Side wall panel 15 Glue allowance 16 Main flap 17 Sub flap 18 Vertical convex part 19 Middle valley part 20 Composite container of Example 2 according to the present invention a to f Fold line g to j Cut line m Perforation B Bottom BL1 Blank of Example 1 according to the present invention BL2 Blank of Example 2 according to the present invention C1 Carton of Example 1 according to the present invention C2 Carton of Example 2 according to the present invention D Body E Band-shaped part M Convex part covered area N Convex part P1 Plastic bottle of Example 1 according to the present invention P2 Plastic bottle of Example 2 according to the present invention S Spot bonding part

Claims (3)

[Claims] 1. A plastic bottle comprising a thinned plastic bottle having a prismatic body and a bottomed tubular body made of paperboard covering the body of the plastic bottle, wherein the body of the plastic bottle and the bottomed body are provided. A composite container provided with an engagement means for integrating the cylindrical body at a predetermined position. 2. The composite according to claim 1, wherein said engaging means is formed by a hot-melt adhesive or by a thermal bonding via a heat sealant material spot-coated on the inner surface of the tubular body in advance. container. 3. The at least one engaging means is gradually lowered toward upper and lower ends at at least one position on a ridge formed by intersecting adjacent side walls of the body of the plastic bottle, and has a predetermined width in the middle. A convex portion having a horizontal valley portion and two upper and lower cutting lines which form a horizontal band-shaped portion which is a part of the tubular body covering the convex portion and which fits into the valley portion; The composite container according to claim 1, wherein the composite container is fitted with a convex portion covering region provided with a vertical cut line branched vertically from the line along the ridge line.