JPH08417B2 - Synthetic resin product with integrated display film - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin product molded from a synthetic resin material, and in particular, a display film having a display such as a product description is integrally formed on the display surface by, for example, an in-mold molding method. The present invention relates to a synthetic resin product in which a display film is previously inserted into a mold and integrally injection-molded for molding.

[0002]

2. Description of the Related Art In recent years, various products have been produced using synthetic resins as materials. For example, trays and cups as packaging containers for packaging foods and the like are made of synthetic resins in large quantities. Being produced. Since these packaging containers are usually disposable, they tend to be made very thin and made of the same material as a whole in consideration of waste treatment and the like.

On the other hand, since it is obligatory for the packaging containers as described above to be provided with product explanations such as food items contained in them and manufacturer's indications, indications such as indication labels are added. Or, display printing is performed. The addition of the display object to the container must be made on the display surface of the container as a matter of course.
As already proposed in Japanese Patent No. 37870, when a container is molded from a synthetic resin material, a display film, which is a display object, is inserted into a mold and integrally injection-molded.

By the way, when filling contents such as food into a packaging container made of such a synthetic resin to obtain a product, each container is taken out and placed at a predetermined position of the filling device. It must be placed, but this placement work is becoming automatic by machines.

That is, at the time of taking out each packaging container, the pressure by mechanically grasping and taking out is applied to each container, but the container itself is thin as described above, and Since the display film is integrated on the display surface, the following problems of folds or breaks are occurring.

That is, in the conventional packaging container,
Since the seam of the display film is a simple straight line as shown in the front view of the main part showing the seam line of the display film of FIG. If an external force is applied, stress will be concentrated on this linear joint as shown in FIG. Then, since the thickness of the packaging container itself is thin as described above, at the joint of this display film, a fold that cannot elastically return to the original shape occurs in the container, or in some cases, Fracture occurs around the fold.

In a packaging container in which a display film is integrated with the display surface, as shown in FIG.
Not only when the seam lines of the display film are completely coincident with each other, but as shown in (c) of FIG.
As shown in (d), the edges of the display film may partially overlap with each other. Even in such a case, the stress due to the external force is partially concentrated on the part of the base material that has penetrated at the seam line of the display film, or on the end part of the display film that overlaps on the lower side. A fold that cannot be elastically restored occurs, or in some cases, a rupture occurs around this fold.

If a fold is formed in the packaging container, the shape of the container will be deformed based on this fold, so that when the container is closed at the opening of the container, for example, when heat sealing is performed, the container is deformed. As a result, the sealing surface of the opening part is displaced and the sealing effect is incomplete, and the commercial value is significantly reduced. The folds and the resulting breakage are also caused by the physical properties of the material forming the container, the packaging state of the container, and the method of taking out and using the container.

As described above, the folds and breaks in the synthetic resin product are not limited to the above-mentioned cases, but may be
Alternatively, it may be caused by an external force applied at the time of taking out for display, etc., and as described above, the commercial value is remarkably reduced.

The above problems may occur not only in the packaging container having the shape shown in FIG. 1 but also in the plate-shaped product shown in FIG. In other words, the product may be the lid of the packaging container described above, or a partition plate or partition plate whose design has been devised by the display film, and the display film may be integrated in the main body (base material). If the seam or boundary is linear, the creases and breaks that reduce the commercial value are likely to occur at that portion.

Therefore, the present inventor has completed the present invention as a result of various studies on how to prevent the above-mentioned problems from occurring.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and the problem to be solved is the occurrence of folds or breaks in a synthetic resin product having a display film. Is.

The object of the present invention is to prevent stress from concentrating at the joints and boundaries of the display film even if the display film is integrally fusion-molded on the display surface. As a result, it is to provide a synthetic resin product having a simple structure that does not cause a fold or break even if it is thin.

[0014]

Means for Solving the Problems In order to solve the above problems, the means adopted by the present invention will be described with reference to the symbols used in the examples. A synthetic resin product in which 11 is integrally molded on a display surface of a base material 12 made of a synthetic resin material, and the seam line of the display film 11 or the boundary line with the base material 12,
The synthetic resin product 10 ″ is characterized in that the dispersion portion 13 having one or more dispersion lines 13 a is formed.

That is, according to the present invention, whether the object has a curved surface portion as shown in FIG. 1 or a flat plate shape as shown in FIG. In the synthetic resin product 10 in which the display film 11 is integrally molded in-molded with, the joint line of the display film 11 (in the case shown in FIG. 1) or the boundary line between the display film 11 and the base material 12 (see FIG. 2). In the case of the one shown in FIG. 2), the dispersion unit 13 having at least one dispersion line 13a
By actively forming, the stress concentrated in the conventional linear seam line or boundary line portion is dispersed at the dispersion line 13a in each dispersion portion 13. In the synthetic resin product 10 in which the stress is dispersed in this way, the folds or breaks of the base material 12 do not occur at the joint line or boundary line of the display film 11.

Since the dispersion portion 13 formed at the seam line or boundary line portion of the display film 11 disperses the stress at the seam line or the like, it is one as illustrated in FIG. Maybe, (b) in Figure 5
There may be a plurality of items as shown in (d).

The synthetic resin product 10 has a method of molding a synthetic resin product 10 in which a display film 11 on which a product description is displayed is integrally molded on a display surface of a base material 12 made of a synthetic resin material. In addition, the dispersion portion 13 is formed at a portion which becomes a seam line of the display film 11 or a boundary line with the base material 12.
After forming the display film 11, the display film 11 is positioned in the cavity 21 of the molding die 20, and the display film 1
1. A synthetic resin material to be the base material 12 is supplied to the back surface side of 1 to integrally form the display film 11 on the display surface side of the base material 12 to form the synthetic resin product 10. It is something.

[0018]

The synthetic resin product 10 constructed as described above
In the synthetic resin product 10, the seam line of the display film 11 or the span S of the boundary line portion between the display film 11 and the base material 12 has a dispersion portion 13 as shown in FIG. It will be expanded to the level difference. That is, in the conventional synthetic resin product 10 having a straight seam, the span of the seam line or the boundary line portion is 0 (zero) as shown in FIG.
The synthetic resin product 10 according to the present invention spreads within a certain range, that is, within the range where the dispersion line 13a exists with respect to the applied external force.

Here, even if a force for bending the illustrated portion acts on both the left and right sides of what is shown in (a) to (d) of FIG. 5, this force is within the range of the span S. The bending force is not locally applied to the synthetic resin product 10 because it is dispersed in the (or boundary line) portion. That is, even if a bending force is applied to the synthetic resin product 10, no folds or breaks occur at the joint line or boundary line portion of the display film 11 in the synthetic resin product 10.

FIG. 5 shows an example in which the main constituent parts of the present invention are applied to the side surface of a so-called deep cup as shown in FIG. It is rare that a force from directions other than the above-mentioned directions is applied to the synthetic resin product 10. That is,
When such a cup-shaped synthetic resin product 10 is lifted or moved, it is usual to apply a force to the side surface portion thereof, mechanically or manually. Almost nothing is applied except for the power of. On the contrary, even if a bending force is applied from the left and right directions as shown in FIG. 5, the shape of the synthetic resin product 10 itself can sufficiently withstand this force. Alternatively, almost no folds or breaks occur at the boundary.

On the other hand, if the synthetic resin product 10 has a flat plate shape as shown in FIG.
By forming the dispersion portions 13 on all the seam lines or boundary lines of the sheet, no matter what direction a bending force is applied to the flat plate-shaped synthetic resin product 10, 5, the stress is dispersed as described above, and the flat plastic resin product 10 is used.
Also in this case, no folds or breaks occur in the seam line portion or the like of the display film 11.

In the method of molding the synthetic resin product 10, as shown in FIG. 6, the display film 11 having the pre-dispersed portion 13 is attached to the cavity 2 of the molding die 20.
Since the synthetic resin product 10 is molded by injection molding according to the in-mold method, in which the synthetic resin material serving as the base material 12 is injected inside the mold 1, the conventional molding method using the molding die 20 is completely changed. Without doing so, the synthetic resin product 10 having the above-described action can be molded.

[0023]

EXAMPLES The invention according to each claim will now be described according to the examples shown in the drawings, but the synthetic resin product 10 according to claim 1 will be explained while taking into account the molding method according to claim 2. Thus, both inventions will be explained simultaneously in parallel.

The synthetic resin product 10 shown in FIG. 1 is a polystyrene cup, and a display film 11 made of the same synthetic resin as the base material 12 of the synthetic resin product 10 is provided on the entire side surface of the synthetic resin product 10. Are integrally molded.
The display film 11 is provided with various indications such as a product name, a manufacturer and a seller of the product, ingredients, a cautionary note, and a pattern in advance by means of printing or the like, and is formed as a film like the name. It was done.

Since the display film 11 is integrated with the side wall display surface of the cup-shaped synthetic resin product 10, it has a substantially fan shape, but the synthetic resin is in a state where both edges thereof are butted. It is integrated with the display surface of the base material 12 constituting the product 10. The edges of the display film 11 to be butted against each other are shown in FIG.
And, as shown in FIG. 3, the dispersion portions 13 are formed so as to be inserted into each other. That is, when the display film 11 is integrated with the display surface of the base material 12, the dispersion portions 13 located at both edges of the display film 11 do not form a large gap on the surface of the display film 11, The surfaces of the base material 12 are completely covered with each other.

As described in the section of the above operation, each of the dispersion portions 13 is for increasing the span S of the seam line of the display film 11 to avoid the concentration of stress applied to the synthetic resin product 10. Therefore, as shown in FIG. 5A, one may be provided at each edge of the display film 11 for implementation. Further, when the synthetic resin product 10 has a cup-like shape as shown in FIG. 1, as shown in (b) of FIG.
Are alternately formed, and the angle of the dispersion line 13a of the dispersion portion 13 is preferably about 45 ° with respect to the horizontal line (when the cup is placed on the desk). This is because when the cup-shaped synthetic resin product 10 is grabbed, it is natural to perform it on both sides, and it is advantageous to disperse the force applied on the side surface at the 45 ° dispersion line 13a of each dispersion part 13. That's why. Furthermore, each dispersion unit 13 has
As shown in (c) of FIG. 5, it may be formed by forming alternating rectangular protrusions, or as shown in (d) of FIG.

Each of the dispersion portions 13 is also advantageous when the display film 11 is arranged at a predetermined position in the cavity 21 of the molding die 20. That is, the display film 1
It is difficult to position the cavity 21 with respect to the cavity 21 when both end edges of 1 to be butted are straight, but by using an appropriate one of the dispersion portions 13 for positioning, The film 11 can be easily positioned in the cavity 21.

That is, the synthetic resin product 10 is molded by using the molding die 20 as shown in FIG. 6, but the display film which has been cut in advance as having the dispersion portion 13 is formed. 11 is positioned and stored in a so-called female mold, and a synthetic resin material to be a base material 12 is injected into a cavity 21 formed between this female mold and a male mold inserted therein. As a result, they are integrally molded. The holding of the display film 11 with respect to the female mold side is carried out by vacuum holding by using static electricity or by sucking air from a suction port formed in the female mold. No modifications are made to the device itself or various devices associated therewith.

Further, as the material of the base material 12 constituting the synthetic resin product 10 of this embodiment, the contents of the synthetic resin product 10 are prevented from being changed by light, and In order to express the image in the color of the synthetic resin product 10, general-purpose polystyrene colored in white is used. Then, the substrate 12 made of this polystyrene
In order to improve the molding and fusion bonding with, the display film 11 is made of polypropylene, nylon, polyester, paper, aluminum foil, or the like. Further, on the back surface of the display film 11, the base material 12
In order to improve the integration with, it is also possible to apply an adhesive agent in advance. In addition, as the base material 12, other injection-moldable materials such as polypropylene, polyester, polyethylene, and polycarbonate can be considered.

FIG. 2 shows a plate-shaped synthetic resin product 10 to which the present invention is applied.
For example, it is formed by forming a lid of the synthetic resin product 10 shown in FIG. 1, or is used as various floor boards, partition boards, and the like. The display surface of the display film 11 of the synthetic resin product 10 is integrally formed with the display film 11 having a pattern, a display, etc., and the boundary portion of the display film 11 with the base material 12 is formed. In the dispersion unit 13
Is formed.

In the embodiment shown in FIG. 2, a plurality of display films 11 are integrally formed on the display surface of the base material 12. However, in the seam line portion of each display film 11, the dispersion portion 13 which is inserted into each other. Is formed, and the dispersion portion 13 is also formed at the boundary line between the display film 11 and the base material 12. At least one dispersion line 13a for distributing the applied external force is formed in each dispersion section 13. That is, the display film 11 in the synthetic resin product 10 has the dispersion portions 13 formed on the entire periphery thereof, and the force applied to the base material 12 is locally applied by the dispersion lines 13 a of the dispersion portions 13. It disperses the stress so that it is not concentrated on.

[0032]

As described in detail above, according to the synthetic resin product 10 of the first aspect of the present invention, the dispersion portion 13 is formed at the seam line or the boundary line portion of the display film 11,
The dispersing portion 13 can disperse the force applied to the base material 12 and prevent folds or breaks from occurring at the joint line or boundary line portion of the display film 11. The thickness of 12 can be further reduced, and the rigidity of the product 10 can be ensured.

[Brief description of drawings]

FIG. 1 is a perspective view of a synthetic resin product according to the present invention.

FIG. 2 is a perspective view showing another embodiment of the synthetic resin product.

FIG. 3 is a partial front view showing an enlarged main part of FIG.

FIG. 4 is an enlarged cross-sectional view taken along line 1-1 of FIG.

FIG. 5 is an enlarged front view of essential parts showing another embodiment of the seam line portion of the display film in the synthetic resin product according to the present invention.

FIG. 6 is a cross-sectional view of a molding die for explaining the molding method of the present invention.

FIG. 7 shows a conventional synthetic resin product, (a) is a front view of a main part, (b) is a partially enlarged cross-sectional view thereof, and (c) and (d) are other main part enlarged cross-sectional views. .

[Explanation of symbols]

 10 Synthetic Resin Product 11 Display Film 12 Base Material 13 Dispersion Part 13a Dispersion Line 20 Mold 21 Cavity

Claims (1)

[Claims] 1. A synthetic resin product obtained by integrally molding a display film on which a product description or the like is displayed on a display surface of a base material made of a synthetic resin material, the joint line of the display film or the base material. A synthetic resin product characterized in that a dispersion portion having one or more dispersion lines is formed on the boundary line between the synthetic resin product and the product.