JPS6145016Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a packaging material made of a thermoplastic resin foam molding used in combination with a cardboard box or alone as a packaging material for home appliances, etc., which cracks when subjected to impact loads such as being dropped. The present invention relates to a shock-absorbing packaging material made of a molded body that suppresses cracking.

Packaging materials using thermoplastic resin foam moldings can be divided into two types, depending on how they are used: full-cover type and partial-cover type. Figures 6A to 6F illustrate examples of how such packaging materials are used;
B is a side patch method that covers both sides of the packaged item, and C is a 8-point method that covers the four corners of the packaged item with 8 points above and below.
D is a corner patch method with a point set, D is a parallel patch method in which the direction of the packaging material is different on the top and bottom by 90 degrees, and E is a top and bottom patch method in which the packaging material is covered from the top and bottom sides respectively. On the other hand, F is a full-coverage method in which the entire surface of the packaged item is covered.

In each of these usage modes, the function of the packaging material is to fix the product during transportation and stabilize its position, and to buffer the product when it receives an impact load due to a fall or the like. Particularly in normal cases, when a thermoplastic resin foam molded product is subjected to a strong impact load such as a drop, the molded product is damaged by cracking to some extent, although the degree varies depending on the type of molded product.

However, regardless of the damage caused by cracking, the packaging material must not impair the product fixing and positional stability functions even after receiving an impact load.

Therefore, in the past, drop tests have been carried out to investigate cases where cracking of the packaging material, which occurs when impact loads predicted during the transportation process are applied, may impair the product fixation and positional stabilization functions. In order to prevent this, various measures have been taken, such as lowering the expansion ratio of thermoplastic resin foam moldings and increasing the wall thickness.

However, these measures naturally lead to an increase in the amount of foamed molding material used, and also bring about various drawbacks such as an increase in packaging time and a loss of the original cushioning function.

Therefore, the inventors of the present invention focused on the above-mentioned drawbacks of the conventional technology, and in order to solve these problems, we first focused on packaging materials made of thermoplastic resin foam moldings due to ridge falls, where the most damage caused by cracking occurs. , it was proposed to provide a groove-like meat cutout in a position near the ridge of an object to be packaged, parallel to the ridge of the object, and partially or entirely.

However, by providing the above-mentioned groove-shaped thinning, it is possible to considerably suppress cracking in areas other than the fracture occurrence area against the bending load generated by the extreme compressive deformation. However, after repeated experiments, it was found that It was found that this dispersed and propagated to the surface where no grooves were provided, causing cracks in some areas.

Therefore, in order to suppress the occurrence of such cracks, the present invention is a further improvement of the structure proposed above. In a packaging material including three surfaces that intersect with each other, the two surfaces that form the ridges intersect on another surface other than the two surfaces that form the parallel ridges of the groove-shaped thinning. It is characterized by being provided diagonally in a direction extending between two planes that are opposite to the ridge angle, that is, the intersection angle, and form the intersection angle.

In addition, in this specification, the expression "provided diagonally" means that it is provided on the opposite side to the apex angle of a triangle whose apex angle is the corner where two surfaces intersect, such as a diagonal in a rectangle, The specific aspects thereof are as shown by the dotted lines in FIG. 3 and the solid lines in FIGS. 4 and 5.

Hereinafter, specific embodiments of the present invention will be further described based on the accompanying drawings.

Fig. 1 is a cross-sectional view of the packaged product when it is subjected to a fall impact in the direction of the ridge in the packaged state, and Fig. 2 is an enlarged view of a part of the packaged product. FIGS. 3 to 5 are diagrams showing examples of cushioning packaging materials according to the present invention.

In each of the above figures, 1 is the product body which is the packaged item, 2 is the cushioning and fixing packaging material made of a side hat type thermoplastic foam resin molding, 3 is the outer cardboard box, and 4 is the ground surface. are shown respectively.

Compressive deformation occurs when foam packaging materials such as foam packaging materials using cardboard boxes and sleeve packaging as shown in FIGS. 1 and 2 above fall from the edge.
As a general tendency, this occurs predominantly at the ridge portion, so a force that attempts to push the molded product apart acts on the two approximately right-angled surfaces forming the falling ridge portion.

As a result, in the case of the method shown in Fig. 1, the cross-sectional shape is shown in an enlarged view in Fig. 2, it is difficult to resist the force that tries to push open the molded product when subjected to a drop impact load. A situation has emerged in which extremely large cracks occur due to the concentration of bending stress at the corners.

Therefore, in order to cope with such a situation, the packaging materials shown in FIGS. 1 and 2 are partially or completely coated on the outer surface of the packaged object, as shown in detail in FIGS. 3 to 5. In the packaging material 2 made of the thermoplastic resin foam, the ridgeline corresponding to the corner ridge of the packaged object 1 in the three mutually intersecting surface members (hereinafter simply abbreviated as "surfaces") constituting the packaging material. On both surfaces 2a and 2b forming
Near the ridge, there is also a groove-shaped thinning 5 parallel to the ridge, while on the other surface 2c there are two surfaces 2a and 2b forming the ridge.
Another groove-shaped cutout 6 is provided diagonally to the corner formed by the intersection of the two grooves.
Among these, the groove-shaped meat stripping 5 on both sides forming the ridge may be provided in a part of the entire length of the surface near the ridge, or may be provided over the entire length, and the arrangement is as shown in the figure.
Although it is desirable to provide it on both sides that form the ridgeline corresponding to the ridgeline, it may be provided on one side instead of both sides. This makes it possible to suppress damage caused by cracking. Further, the number of grooves on each surface is not limited to one.

Further, the same effect can be obtained even if the shape of the groove of the groove-shaped meat stripping 5 is a strip groove with a curved inner bottom as shown in FIGS. 1 to 3, or a rectangular cross-sectional shape. I can do it. In particular, the width of the groove is not a very important factor, but if it is made too small, the groove will become clogged during compression deformation, which may reduce the effect, so it is generally recommended to make it 5 mm or more. preferable. Also, there is no need to specifically limit the position where the groove is provided and the depth of the groove, but when considering the wall thickness of the packaging material, it should not exceed 2t from the corner of the packaging material on the side that contacts the packaged object. Practically speaking, it is desirable that the depth be 4/5 t or less and be provided in a portion that still has a contact surface with the packaged object.
Providing more than 2 tons has less meaning in terms of buffering performance against drop impact loads at the ridge.
Also, a depth exceeding 4/5 t should be avoided from the viewpoint of the durability of the packaging material.

On the other hand, another thinning 6 on the other surface 2c that is perpendicular to the two surfaces 2a and 2b having the groove-shaped thinning 5 may have any shape, but it may be formed during compression deformation. It is sufficient that the device cuts off the propagation of stress and prevents it there. Therefore, in order to prevent the propagation of stress, it is preferable to provide it near the ridge and diagonally to the ridge angle, and the position is also When the thickness of the molded packaging material is t, the distance d from the corner intersection P on the outer surface in contact with the packaged object is most preferably in the range of 0.5t<d<3t, particularly in the range of t≦d≦2t, In the case of a groove, the depth is preferably 4/5t or less, similar to the groove-shaped thinning 5 described above. This meat stealer 6 also has the same effect whether it is on the inside or outside of the surface, but avoid the same side for the meat stealer 5, and if the meat stealer 5 is on the inside, the meat stealer 6 is on the outside. It is important to be different. This is because if they are on the same side, both meat stealers 5 and 6 will occur in succession, which will actually deteriorate the function.

FIGS. 4 and 5 show examples of the shape of such a meat cut 6, and even if the groove-shaped ends do not reach both surfaces, they are sufficiently effective in preventing the propagation of stress.

Thus, by forming the groove-shaped thinning in the present invention as described above, even if there is a force that tries to push the molded product open during a drop impact as described above, the molded product is not moved in the ridge direction with respect to the product contact surface. It is possible to absorb the force of trying to push it open with the thinning holes 5 on both sides, thereby dispersing the bending stress, and also to prevent the stress from propagating due to the thinning holes 6 on the other surface. In combination, compared to the case of the double-sided groove-like thinning 5 according to the above proposal, the ridge portion maintains a shape closer to that of simple compression, thereby significantly suppressing crack damage. I can do it.

As described above, the packaging material of the present invention has three surfaces that intersect with each other, and the two surfaces forming a ridgeline corresponding to the ridge of the package are provided with grooves parallel to the ridges over part or the entire length of the surface. Establishment of a meat theft law, and
On the remaining surface, diagonally to the intersection of the two surfaces having the groove-like thickness cut-off, a thickness cut-off for preventing stress propagation is provided by making the inner and outer sides different from the groove-shaped cut-off thickness, When the packaging material falls off the edge,
Even if a force that tries to push the molded product apart acts on the two approximately right-angled surfaces that form the ridge, it absorbs this force and disperses the bending stress to prevent cracking and damage in the thermoplastic foam resin molded product. Not only can damage from cracking of the packaging material due to the impact of the fall be suppressed in the case of a fall on a ridge where the greatest impact occurs, but also the dispersion of stress can be prevented by blocking the propagation of stress on other surfaces. In addition, unlike lowering the foaming ratio or increasing the wall thickness of the molded product, it does not increase the amount of foamed molding material used, and the same material can be used. It is an extremely effective packaging material both economically and practically.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a state where a product packed with packaging material falls from the edge, Fig. 2 is an enlarged view of part A in Fig. 1, and Figs. 3 and 4 are packaging according to an embodiment of the present invention. Fig. 5 is a perspective view of the bottom side of another embodiment of the present invention; Fig. 6 is a perspective view of the bottom side of the material;
Figures A to F are perspective views showing examples of how the packaging material is used. 1... Item to be packaged, 2... Packaging material, 3... Outer cardboard box, 5, 6... Meat theft.

Claims (1)

[Claims for Utility Model Registration] 1. It is made of a thermoplastic resin foam molded product, has three surfaces that intersect with each other, and is partially or completely applied to the corners or outer surfaces including the corners of the packaged object during packaging. In the packaging material, there is a part of the surface length or the entire length parallel to the ridge near the ridge on at least one of the two surfaces forming the ridge corresponding to the corner ridge of the object to be packaged. A groove-shaped thinning is provided on either the inner or outer side, and further, on one surface other than the two surfaces, a ridge angle formed by the intersection of the two surfaces is set as an apex angle and is opposed to the corner. A cushioning packaging material characterized in that a diagonally diagonal meat strip is provided on the side opposite to either the inner or outer side where the groove-shaped meat strip is provided. 2 When the wall thickness of the packaging material is t,
It is installed at the part of the packaging material that has a contact surface of 2 tons or less from the ridgeline on the side that comes into contact with the packaged object.
The cushioning packaging material according to claim 1, which has a depth of 4/5 tons or less. 3 When the wall thickness of the packaging material is t, a diagonal thinning at the ridge angle due to the intersection of two surfaces is provided within a distance range of 0.5 t or more and 3 t or less from the corner intersection on the outer surface that contacts the packaged object. and its depth is 4/5
t or less, the cushioning packaging material according to claim 1 or 2 of the utility model registration claim.