JP5561598B2 - Synthetic resin bottle with double wall structure - Google Patents

Description

The present invention relates to a synthetic resin bottle having a double wall structure formed by using an insert molding technique.

As a double-walled synthetic resin bottle with a transparent outer shell, it can exhibit excellent optical decoration functions, so it is required to differentiate products with high-quality packaging. Development of use for cosmetic containers is progressing.
As a molding method of the double wall structure, an insert molding method is known in which a part or the whole of a bottle body constituting an inner layer is used as an insert material, and a transparent outer shell body is molded by injection molding.

In this insert molding, a bottle body serving as an insert material is held in a mold, and a molten resin is injected and filled into a cavity formed between the outer peripheral surface of the bottle body and a split mold.
However, since the bottle body is made of synthetic resin and the inside is hollow, the bottle body is filled with cooling water or cooling air and further circulated so that the bottle body acts when the outer shell body is injection molded. Therefore, it is necessary to prevent the bottle body from being deformed by the molten resin.
For example, Patent Document 1 describes a method in which a bottle main body is assembled as an insert material in a split mold, and cooling water is circulated and supplied into the bottle main body for cooling.

JP-A-49-083751

In the bottle having the double wall structure as described above, a decorative layer such as a printing layer is laminated on the outer peripheral surface of the body of the bottle body, and the pattern by the decorative layer is inside the peripheral wall of the transparent outer shell. 3D visual effects can be exhibited.
In particular, by using the hot stamping method and representing the product name and brand name with a metal foil film layer formed on metallic characters such as gold, it is possible to achieve a higher level of luxury packaging. It becomes.

  FIG. 7 is a schematic illustration of the hot stamping method. The transfer film 51 used in the hot stamping method is basically a base film 52a / peeling layer 52b / clear coat layer 53a / metal foil film layer 53b / adhesive layer. A layer structure such as 53c is used. Then, as shown in FIG. 7A, the transfer film 51 is disposed on the surface of the molded product 56 and pressed with a heated stamp 55, whereby the adhesive layer 53c is softened in the pressed area, and the molded product 56 is pressed. As shown in FIG. 7B, the decorative layer 53 made up of the clear coat layer 53a / the metal foil film layer 53b / the adhesive layer 53c is peeled off from the release layer 52b. It is transferred to the surface of the molded product 56.

Here, in accordance with a request from the basic mechanism of the hot stamp method described above, in the decorative layer 53 to be transferred, the adhesive layer 53c is softened and deformed by applying heat, and further the metal foil film layer 53b. And a clear coat layer 53a for preventing the occurrence of scratches on the metal foil film layer 53b, and can be easily divided, and a bottle body decorated with an outer peripheral surface by a hot stamp method is used as an insert material. When the outer shell is injection-molded, this decorative layer comes into direct contact with the high-temperature molten resin, so the decorative layer itself peels off due to the flow pressure of the molten resin, and wrinkles or cracks occur in the metal foil film layer. There is a problem that the decorativeness is impaired.
And the problem of the deterioration of the decorating property by insert molding of the decorative layer according to such a hot stamp method is the enhancement of cooling by the cooling water or cooling air described above, the peripheral wall of the outer shell body in order to reduce the molten resin pressure This is not easily solved by means such as increasing the thickness.

Therefore, the present invention transfers a decorative layer having a metal foil film layer to the outer peripheral surface by a hot stamp method, and uses a laminated bottle body as an insert material, and has a double wall structure in which a transparent outer shell is injection molded. In resin bottles, the technical challenge is to effectively prevent the peeling of the decorative layer itself and the occurrence of wrinkles or cracks in the metal foil film layer. It is an object of the present invention to provide a synthetic resin bottle that realizes a high-grade packaging in combination with a three-dimensional visual effect due to the structure.

The main structure of the present invention for solving the above problems is a bottle body which is a synthetic resin blow housing with a mouth tube portion continuously provided, and a bottomed cylindrical transparent covering the body portion and bottom portion of the bottle body. In a synthetic resin bottle having a synthetic resin outer shell (21),
Bottle body, decorative layer piece having a metallic foil layer is transferred onto the outer peripheral surface by a hot stamping method of the body, is a transparent laminated Rutotomoni, decorative layer pieces of the outer peripheral surface with a predetermined area including the periphery Covered with a protective layer,
The outer shell body) is injection molded using the bottle body as an insert material, so that the decorative layer piece formed on the outer peripheral surface is in contact with the inner peripheral surface of the outer shell body via the protective layer. It is said that.

Here, since the decoration layer by the hot stamp method is a fragment of characters or the like, the decoration layer piece is used in the above configuration.
The decorative layer piece by the hot stamp method generally has a layer structure of clear coat layer / metal foil film layer / adhesion layer, and in the injection molding of the outer shell using the bottle body as an insert material, As described above, the flow pressure of the high-temperature molten resin acts directly on the decorative layer piece, and the decorative layer piece itself peels off due to deformation of the adhesive layer that is easily softened by heat, and the metal foil film layer is wrinkled or cracked. Will occur,
According to the said structure, since the adhesive layer part of a decoration layer piece is not exposed by coating the predetermined area | region including a decoration layer piece and its periphery with a protective layer, the decoration layer resulting from a deformation | transformation of this adhesion layer It is possible to reliably prevent the strip itself from peeling off.

  As the protective layer, a resin material that is hard and heat resistant by heat treatment or ultraviolet irradiation, or a film having high heat resistance, etc. can be used, effectively preventing wrinkles and cracks in the metal foil film layer. Can be suppressed.

The shape of the bottle body by blow molding can be various shapes such as a round shape such as a cylindrical shape, a square tube shape, a polygonal tube shape, etc. It can be round, square tube, polygonal tube, etc., using a transparent outer shell by combining the shape of the bottle body and outer shell, for example, a polygonal cylindrical bottle body and polygon Various optical decoration effects such as crystal glass-like optical effects can be achieved by combining cylindrical outer shells.
The bottle body can be opaque or transparent depending on the purpose.
The transparent outer shell includes a translucent body or a colored transparent body.

  Another configuration of the present invention is that, in the above main configuration, the protective layer is a transparent printing layer by printing or a transparent coating layer by painting.

  Transparent printing layer and coating layer can be coated without damaging or deforming the decorative layer piece laminated on the outer peripheral surface of the bottle body, and it is hard and highly heat resistant by heat drying and ultraviolet irradiation Thus, the function as the protective layer can be sufficiently exhibited.

  Still another configuration of the present invention is that, in the above main configuration, a label having a transparent film base material is attached to form a protective layer.

By using a film having high heat resistance such as a biaxially stretched film made of polyethylene terephthalate resin on a transparent film base material, and covering the decorative layer piece via the adhesive layer, a protective layer As a result, it is possible to sufficiently exhibit the function.

Since the present invention has the above-described configuration, the following effects can be obtained.
That is, by covering the decorative layer piece by the hot stamp method and a predetermined area including the periphery thereof with the protective layer, the decorative layer piece itself is reliably prevented from peeling off, and the metal foil film layer is free from wrinkles and cracks. Generation can be effectively suppressed, the original decoration by the metal foil film layer can be exhibited with high quality, and the optical visual effect by the transparent outer shell body is combined with a high-class feeling. A synthetic resin bottle for realizing certain packaging can be provided.

It is a whole perspective view which shows one Example of the synthetic resin bottles of this invention. (A) of the bottle of FIG. 1 is a half longitudinal cross-sectional view, (b) is a bottom view. (A) of the bottle main body used for the bottle of FIG. 1 is a front view, (b) is a bottom view. (A) of a decoration layer piece is sectional drawing which shows schematically the lamination | stacking state in the bottle main body of FIG. 3, (b) is the lamination | stacking state in the bottle of FIG. It is a metal mold | die block diagram before shaping | molding used for description of the shaping | molding method of this invention. It is a metal mold | die structure figure after a shaping | molding used for description of the shaping | molding method of this invention. It is this schematic explanatory drawing of the hot stamp method.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the accompanying drawings.
1 to 4 show an embodiment of a synthetic resin bottle (hereinafter simply referred to as a bottle) having a double wall structure according to the present invention. FIG. 1 is an overall perspective view, and FIG. 2 (b) is a bottom view, FIG. 3 (a) is a front view of a bottle body 11 used for the bottle 1 of FIG. 1, FIG. 3 (b) is a bottom view, and FIG. 4 (a). FIG. 4B is a cross-sectional view schematically showing a laminated state of the decorative layer piece 17 in the bottle body 11 and FIG.

  This bottle 1 has a cylindrical mouth tube portion 2, a shoulder portion 3, a cylindrical body portion 4, and a bottom portion 5, from a bottle main body 11 and a transparent and thick outer shell body 21 that covers the bottle main body 11. The casing is configured so that the overall height is 85 mm and the diameter of the body portion 4 is 47 mm.

  The bottle body 11 is a colored biaxial stretch blow molded product made of polyethylene terephthalate (PET) resin.

Further, as shown in FIGS. 3A and 4A, a decorative layer piece 17 having a metal foil film layer 17b is disposed on the outer peripheral surface of the body portion 14 of the bottle body 11 by a hot stamp method. They are stacked and the stylized golden letters (A, B, C, D, E) are drawn.
Moreover, the protective layer 18 is laminated | stacked so that these decorative layer pieces 17 may be coat | covered in the rectangular area | region containing these five decorative layer pieces 17. FIG.
Here, the layer structure of the decoration layer piece 17 is clear coat layer 17a / metal foil film layer 17b / adhesion layer 17c.
Further, in this embodiment, the protective layer 18 is a printing layer using a transparent heat drying type ink by silk printing,
The protective layer 18 is not limited to the print layer using the heat drying type ink as described above. In addition to the performance as a protective film, the secondary processability to the hollow bottle body 11 is also considered. A printing layer using UV curable ink can also be used, and a method of coating with a coating layer by coating, a method of sticking a transparent label based on a film having heat resistance, etc. You can also choose.

  The outer shell body 21 is made of a transparent polyester resin-based PCTA resin in terms of compatibility with the bottle body 11 made of PET resin, etc., excellent formability, mechanical strength, and chemical resistance. A cylindrical body with a bottom made up of a cylindrical cylindrical portion 24 and a bottom portion 25, the wall thickness of the peripheral portion of the cylindrical portion 24 is 2.5 mm, and the thickness of the bottom portion 25 is 3.5 mm at a thin portion. is there.

The bottle 1 of the present embodiment is obtained by molding the outer shell 21 by injection molding using the bottle body 11 as an insert material by a method described later, but the protective function of the protective layer 18 is sufficiently exhibited. Despite the severe conditions such as flow and filling of the high temperature molten resin during the insert molding, not only the decorative layer piece 17 itself is peeled but also no creases or cracks are observed in the metal foil film layer 17b. It was.
Along with the colored bottle body 11, a visual effect is exhibited such that a stylized character by the metal foil film layer 17 b floats in the thick and transparent outer shell body 21, and a high-quality and high-quality decoration is achieved. Has been demonstrated.

  Next, a method for forming the bottle 1 of the above embodiment will be described with reference to FIGS. 5 and 6 are diagrams for explaining a configuration example of an injection mold 31 for molding the outer shell 21 using the bottle main body 11 as an insert material, and a molding procedure example of the bottle 1, and FIG. 5 shows a mold before molding. FIG. 6 is a block diagram of a mold after molding.

As shown in FIG. 5, the injection mold 31 is mainly is composed of a bottle body holding portion 32 and the cavity mold 33., the bottle main body 11 is fixed to the mouth tube 12 in the bottle the body holding portion 32 Then, the outer shell 21 is molded by filling the cavity mold 33 with molten resin between the cavity mold 33 and the bottle body 11 as an insert material that functions as a core. A cavity 34 is formed. A gate port 37 is disposed at a position facing the bottom 15 of the bottle body 11 of the cavity mold 33 so as to communicate with the cavity 34.

An air pin 36 is inserted into the hanging bottle body 11, and the air pin 36 abuts the tip of the air pin 36 against the bottom 15 of the bottle body 11, and has an outlet hole for cooling air a opened at the tip. ing.
And cooling air a is circulated and supplied to the bottle main body 11 through the air pin 36, but this cooling air a may use the air cooled by the cooler, or more than the molten resin to be injected. Room temperature air having a low temperature may be used.

Then, as shown in FIG. 5, the synthetic resin forming the outer shell body 21 in the state where the bottle body 11 is set in the cavity mold 33, in this embodiment, the ionomer resin is melted and the cavity is opened from the gate port 37. 34.
At this time, the molten resin flows so as to collide with the bottom 15 of the bottle main body 11 as indicated by the white arrow shown in FIG. 5, wraps around the peripheral wall of the barrel 14 , and then the barrel 14 along the peripheral wall. The outer shell body 21 is molded as shown in FIG. 6.

Here, according to the flow behavior of the molten resin as described above, when the heat and injection pressure of the injected high-temperature molten resin act directly on the vicinity of the bottom 15 of the bottle body 11 and the vicinity of the bottom 15 is extreme. May be greatly deformed into a crushed shape, and even in a small crushed shape deformation, wrinkles are generated on the outer surface in the vicinity of the bottom portion 15, so that the molded bottle 1 has a transparent outer surface. This cocoon appears through the shell 21 and the original decoration may be impaired.
In this respect, the deformation in the vicinity of the bottom 15 is not only enhanced by the cooling air a of the bottle body 11 but also a metering filling method, and the peripheral wall including the bottom 25 of the outer shell 21 is thickened. It can be suppressed by combining these means.

In the metering and filling method, the cavity 34 is filled with a predetermined amount of molten resin in accordance with the volume of the cavity 34, and the pressure holding step is omitted. By adopting this metering and filling method, a large pressure in the pressure holding step is obtained. A rise can be avoided.
Also, For the point referred to as the thickening of the peripheral wall of the outer shell 21, the result of investigation experimentally, so that the peripheral wall at least 2.5mm of the cylindrical portion 24, also the bottom 25 has a thickness of at least 3mm The thickness of the cylindrical portion 24 of the outer shell 21 is 2.5 mm, and the thickness of the bottom 25 is 3.5 mm at the thin portion.
Of course, the above numerical value relating to the thickness of the peripheral wall of the outer shell body 21 is a guide only, and is appropriately set in consideration of the heat resistance of the resin used for the bottle body 11, the wall thickness of the peripheral wall of the bottle body 11, and the like. It is.

As mentioned above, although the structure of the synthetic resin bottle which has a double wall structure of this invention and its effect were demonstrated along the Example, this invention is not limited to these Examples.
For example, in the above embodiment, the combination of the shape of the bottle body and the outer shell is a combination of the cylindrical barrel and the cylindrical barrel. Various combinations can be adopted.

In addition, the synthetic resin material used for the bottle body 11 and the outer shell body 21 is not limited, and in addition to the combination of the PET resin and the PCTA resin of the above-described example, A resin material capable of exhibiting required properties including moldability, such as combining an outer shell body 21 made of ethylene ionomer resin with a bottle body 11 which is a biaxially stretched blow molded product made of polypropylene (PP) resin, Needless to say, it can be freely selected and used.
Further, for example, in a biaxial stretch blow-molded product made of PP resin, a fine powder filler is dispersed in PP resin so that the bottle main body 11 exhibits a pearl-like appearance based on white, etc. Variations can be varied.

In addition, decoration by the hot stamp method is not limited to stylized characters, and it can be shaped to suit the purpose of decoration, such as a pattern or pattern, and further, depending on the purpose of decoration, printed layers and vapor deposition Other decorative layers such as layers can be added and laminated.
In addition to the method in which the protective layer is coated in a narrow area surrounding all individual characters as in this embodiment, the entire layer is covered in the range where the characters are formed. Among various coating modes, such as a method, a method of covering the entire circumference, and a method of individually coating each character, the protection function by the protective layer is taken into consideration and the productivity of the coating process is also taken into consideration. It can be selected appropriately.

As described above, the synthetic resin bottle having the double wall structure of the present invention can exhibit the original decorating property by the metal foil film layer by the hot stamp method with high quality, and is a transparent outer shell body. Combined with the optical visual effect of, high-quality packaging can be realized, and a wide range of usage development is expected in the field of cosmetic containers and the like.

DESCRIPTION OF SYMBOLS 1; Bottle 2; Mouth part 3; Shoulder part 4; Body part 5; Bottom part 11; Bottle main body 12; Mouth part 13; Shoulder part 14; Body part 15; 17b; metal foil film layer 17c; adhesive layer 18; protective layer 21; outer shell 24; cylindrical part 25; bottom part 31; injection mold 32; bottle body holding part 33; Gate opening 51; transfer film 52a; substrate film 52b; release layer 53; decorative layer 53a; clear coat layer 53b; metal foil film layer 53c;

Claims (3)

A bottle body (11), which is a synthetic resin blow housing with a continuous tube section (12), and a bottomed cylindrical shape that externally covers the body (14) and the bottom (15) of the bottle body (11). A transparent synthetic resin outer shell (21) ,
Before Symbol bottle body (11), decorative layer piece having metal foil film layer (17b) on the outer circumferential surface by the hot stamping method of the barrel (14) (17) is transferred, stacked Rutotomoni, of the outer peripheral surface The decorative layer piece (17) and a predetermined region including the periphery thereof are covered with a transparent protective layer (18),
When the outer shell (21) is injection-molded using the bottle body (11) as an insert material, the decorative layer piece (17) formed on the outer peripheral surface passes through the protective layer (18). And a synthetic resin bottle having a double wall structure, wherein the bottle is configured to be in contact with the inner peripheral surface of the outer shell (21) . The synthetic resin bottle having a double wall structure according to claim 1, wherein the protective layer (18) is a transparent printed layer by printing or a transparent coating layer by painting. The bottle made of a synthetic resin having a double wall structure according to claim 1, wherein a label having a transparent film base material is attached to form a protective layer (18).

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