JPH0210026B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method for packaging items contained in a tray, and includes, for example, accumulating pure packs in a tray and wrapping the accumulated items with a film. The present invention relates to a method of packaging tray contents in which a tray with improved corner portions is used to prevent damage to a wrapping film.

(Prior Art) For example, to package milk, a roof-shaped container consisting of a main body A and a roof-shaped portion B, as shown in FIG. 1, is used, and this is known as a so-called Pure Pack P. This type of Piure Pack P is an individual package in which milk is divided and individually wrapped, and the containers are made of something like carton paper and are not strong enough, so they cannot be stacked. Therefore, currently they are packed in crates and transported in individual packaging for protection. On the other hand, when the Pure Pack is packed in a cardboard box as shown in FIG. 2, it is shrink-wrapped with a film as shown in FIG. 2, whereby the Pure Pack P is slightly tightened and fixed immovably.

(Problems to be Solved by the Invention) However, in the case of products packaged with film as described above, the film may be damaged at the corners of the packaging case. For example, if the packaging box is a commonly used cardboard tray, the cardboard is bent at a right angle to form a corner r, as shown in FIG. In addition, the corners of the bottom of this tray are formed, for example, by bending the punched cardboard shown in FIG. 4 along fold line 1 to form the shape shown in FIG. is shown as 5. Similarly, when it is bent along the bending lines 2 and 3, it becomes as shown in FIG. If such a right or acute corner is formed, the film may be damaged at the corner and a hole may be formed when the film is wrapped as described above. When holes are formed in the film, the tightening force of the film is also weakened, and improvements have been required.

In addition, a tray with a hexagonal pyramid-shaped bottom and a cylindrical shrink film are used to package a plurality of tetrahedral containers in one package, as seen in Japanese Patent Publication No. 50-20507. No measures were taken to prevent holes from forming.

Therefore, the present invention aims to improve the conventional problem that the film may be damaged due to the corners of the tray, as described above, by using a tray with improved corner parts to transfer the contents of the tray to the film. The object of the present invention is to provide a method for packaging tray contents.

(Means for Solving the Problems) The present invention provides the following method to achieve the above objects.

That is, in a packaging method in which a tray containing objects to be packaged is wrapped in a film,
The tray is formed by folding a bottom piece and a side piece, and the corners formed at the bent ends of each side piece that make up the tray are cut out diagonally with respect to the folding line of the above-mentioned side piece. This method of packaging tray contents is characterized in that the film is formed at an obtuse angle so as to be located at a diagonally lined corner, and the film is brought into contact with this corner at an obtuse angle.

(Embodiment) Next, an embodiment of the present invention will be described based on FIGS. 5 to 11.

Figure 5 is a developed view of the tray used in this example.
Figure 6 is a diagram showing the formation process of the bottom corner of the tray, Figure 7 is a diagram showing the state of formation of the upper corner of the tray, and Figure 8 is a diagram of the tray containing Pure Pack. , FIG. 9 is a stretch packaging process diagram, FIG. 10 is a diagram showing the influence of external force on the package of FIG. 9, and FIG. 11 is a diagram showing the stacked state of the package.

In FIG. 5, numeral 10 is a punched cardboard. 11 is a bottom piece; this bottom piece 11
A front piece 12 and a rear piece 13 are provided on both side edges of the bottom piece 11, and a left side piece 14 and a right side piece 15 are provided on both ends of the bottom piece 11, respectively.

The front piece 12 is formed into a thin rectangular shape on the inner bottom piece 11 side, and the outer side has a diagonal line part 12 with a narrow tip.
It is formed into a trapezoidal shape with a and 12a'. Further, this front piece 12 has folding pieces 16, 16' extending on both sides of the rectangular portion. Between the folding piece 16 and the left side piece 14 and the folding piece 1
6' and the right side piece 15 are each provided with a notch 1.
7, 17' are formed.

Here, the inner end of the notch 17 is cut obliquely inward from the left side piece 14 side as shown by the diagonal line 17a, and the tip thereof extends beyond the boundary between the front piece 12 and the folded piece 16 to the front piece 12. It has reached this point. Notch 1
7' is also formed to have a diagonal line 17a'.

Similarly to the front piece 12, the rear piece 13 also has a diagonal line part 13.
It is formed into a trapezoidal shape having folding pieces 16 and 16' on both sides of the rectangular part.
8,18'. Notches 19, 19' similar to the above-mentioned notches 17, 17' are formed between the folding piece 18 and the left side piece 14 and between the folding piece 18' and the right side piece 15. 19 and 1
7. The notches 19' and 17' are formed line-symmetrically. Note that the notches 19, 19' are the same as the hatched parts 17a, 17a'.
It has a′.

The cardboard shown in FIG. 5 is bent along the dotted line to form a tray. Here, while referring to Figure 5, we will explain 1 based on Figures 6 and 7.
The assembly state of the two corner parts will be explained.

In FIG. 6A, 1' is a fold line between the front piece 12 and the bottom piece 11. It is set in. Also,
2' is a folding line of the folding piece 16, and this folding line 2' is provided between a position slightly outward from the inner tip of the notch 17 and the end of the oblique line part 12a of the front piece 12.

Further, 3' is a fold line of the left side piece 14,
It is located outward by the thickness of the folding piece 16 from the folding line 2' and is provided between the diagonally shaded portions 17a and 19a.

In such a structure, when the front piece 12 is first bent along the bending line 1', it becomes as shown in FIG. 6B, and an obtuse corner 5' is generated. Next, when the folding piece 16 is bent at a right angle along the bending line 2' as shown in FIG. A right corner r′ is created. Further, a right-angled corner 4' is formed at the lower bottom. Thereafter, when the left side piece 14 is bent, an obtuse corner 6' is formed as shown in FIG.

In this state, one corner of the tray is formed by bonding the left side piece 14 and the folding piece 16 with adhesive. Because of the thickness of the left side piece 14, not only the obtuse angle corners but also the right angle 4' corners come into contact with the later-described film that covers these corners.

The cardboard boxes shown in FIG. 5 are assembled in the above manner to complete the tray shown in FIG. 8. The pure pack P shown in FIG. 1 is packed into this tray as shown.

At this time, if partition walls 20, 20' made of cardboard, for example, are appropriately provided between the pillow packs, the strength of the tray against external forces in the vertical direction is increased. The edge of the protrusion of the roof-shaped portion B of the private pack P is located at the same level as the upper edges of the front piece 12 and the rear piece 13.

The trays filled with pure packs are then stretch-wrapped as shown in FIG.
That is, (a) the film is cut to a certain length, (b) this film is stretched, (c) this film is placed over the object to be packaged, and (d) the films are overlapped at the bottom of the tray and heat sealed. , (e) The product thus produced is discharged on a conveyor. When stretch-wrapped in this way, the film covers the corners of the tray, but the corners above the diagonal lines 12a, 12a', 13a, 13a' of the front piece 12 and the rear piece 13 are obtuse angles. , folding piece 16, 16a'18, 1
The corners created by the bending of 8' are also obtuse angles, and the tray bottom and corners are designed so that the film can come into contact with the obtuse angles as described above, so that excessive stress will not be concentrated on the film. do not have. Therefore, the film is kept in a state where it is difficult to tear.

When the item in Fig. 8 is stretch-wrapped in this way, the packages P can be attached to each other or to the partition wall 2.
0.20' Because it is tightened by the inner wall of the tray,
As shown in FIG. 10, deformation of the main body A of the Pure Pack P, which is easily deformed even when force is applied from above, can be suppressed. In this case, the structure of the roof-shaped part B of the Pure Pack P makes it difficult to deform, so even if the stretch packages are stacked in multiple tiers as shown in Figure 11, the lower layer of the Pure Pack will not be deformed, and vibrations and shocks during transportation will not occur. , handling, etc. will not cause the pieces to loosen from each other. Also,
In the case of stretch-wrapped items as described above, when the heat shrinkage process of shrink-wrapped items is completed, the shrinkage stress disappears, which tends to cause mutual friction and deformation of the pure packs, whereas the tightening force of the film lasts for a long time. Since it does not decrease, it does not cause loosening of the packing. Therefore, the packaging state of the pure pack can be kept constant, which is convenient.

As shown in FIG. 11, the upper part of the tray used in this example is trapezoidal, so it is possible to reach both ends of the bottom of the stacked upper tray. There is no need to reach through the holes to lift the tray as shown in the figure above, and the film can be prevented from tearing when lifting the tray.
In addition, if a self-adhesive film is used as the stretch packaging film, it is possible to reduce the possibility of the load buckling or sliding even when the load is in the form shown in FIG. 11.

In addition, the stretch packaging described above, like the shrink packaging shown in Figure 2, has air vent holes (also used as gripping holes) to remove air between the film and the tray.
Since there is no need to provide the film with the tray, the entire surface of the tray can be covered with the film, and the cardboard can be protected from moisture and water.

When such stretch-wrapped tray contents are transported and displayed, the film can be cut off and the pure pack can be taken out immediately. Moreover, since the tray is not expensive like a crate packaging box, it can be disposable, and the cost advantage of one-way packaging can be utilized.

In the above embodiment, a right-angled corner 4' was created in FIG. This corner 4'
can be made obtuse.

In addition, in the above embodiment, the Pure Pack P is placed upright, but if it is turned over and stuffed as shown in Figure 13, and the triangular space created by the roof-shaped part of the Pure Pack P is used for stretch wrapping, the It has several times the load strength compared to the stretch-wrapped version of the film shown in Figure 8, and the risk of accidentally tearing the film during transportation and handling can be reduced.

Here, the 2 that appears on the side shown in Figure 13
The two line portions are folded lines, not corners.

In addition, as shown in FIG.
are lined up next to each other in the normal position, the lower part of these pillow packs is stored in the lower tray 21, the protruding part of the upper roof-shaped part is stored in the upper tray 22, and when they are stretch-wrapped with a film 23, the cardboard The amount of each tray and film used is approximately 2/2 compared to the stretch packaging shown in Figure 8 above.
It only takes about 1. The packages shown in FIG. 14 can also be stacked in blocks as shown in FIG. 15.

Although only stretch packaging has been described in each of the above embodiments, tearing of the film can be prevented even in the case of shrink packaging by providing the corner portions of the tray with the above structure.

(Effects of the Invention) As explained above, according to the present invention, since the corners of the tray are formed at obtuse angles,
When storing, for example, a pure pack in this tray and wrapping the peripheral side of the stored product with a film, it is possible to prevent the film from being damaged by the corners.

[Brief explanation of drawings]

Figure 1 is a diagram showing a pure pack, Figure 2 is a diagram of a shrink-wrapped packaging box, Figure 3 is a diagram showing the top corner of a conventional tray, and Figure 4 is a diagram showing a corner of the bottom of a conventional tray. A diagram showing the formation process, FIG. 5 is a developed view of a tray used in the method of one embodiment of the present invention,
FIG. 6 is a diagram showing the formation process of the bottom corner of the tray, FIG. 7 is a diagram showing the state of formation of the top corner of the tray, and FIG. 8 is a diagram of the tray containing Pure Pack. Figure 9 is a process diagram for stretch-wrapping the item shown in Figure 8, Figure 10 is a diagram showing the effect of force on the stretch-wrapped item, and Figure 11 is an example of how the stretch-wrapped item is packed. Figures 12 and 12 are exploded views of a portion forming the corner of the tray used in the method of another embodiment, and Figures 13 and 14 each show a packaged product produced by the method of the other embodiment. 15 is a diagram showing a state in which the components shown in FIG. 14 are stacked. In the figure, P is a pure pack as a packaged object, 1
1, 12, 13, 14, 15, 16, 16', 1
8, 18' are surface pieces constituting the tray; 12a, 1;
2a', 13a, 13a', 17a, 17a', 17a'',
19a and 19a' are shaded areas.

Claims (1)

[Claims] 1. In a packaging method in which a tray containing an object to be packaged is wrapped in a film, the tray is formed by folding a bottom piece and a side piece, and each side piece making up the tray is folded. A corner formed at the end of the folded portion is formed at an obtuse angle by being located at a diagonally lined part cut out diagonally with respect to the folded line of the surface piece, and the film is brought into contact with this corner at an obtuse angle. A method for packaging tray contents, characterized by: