JP4243775B2 - Blow molding housing - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a blow-molded casing referred to as a so-called Delami bottle in which an inner layer forming an inner bag body is formed in a thin-walled and laminated manner in an outer layer forming an outer container.
[0002]
[Prior art]
The Delami bottle is composed of an outer layer that forms an outer body and an inner layer that forms a thin inner bag body that can be peeled off. The outer body is formed with an intake hole that allows outside air to enter between the outer layer and the inner layer. In addition, it is used as a dispensing container with a cap combined with a dispenser pump, and the outer container is configured to form a flexible outer shell that can be squeezed and restored, and a check valve is provided in the intake port. Furthermore, a cap having an opening provided with a check valve is screwed to be used as a squeeze-type dispensing container.
[0003]
The dispensing container as described above is capable of suppressing the entry of outside air into the container by reducing the volume of the inner bag while maintaining the original shape of the outer container as the content liquid is dispensed. In addition, since it is possible to suppress the occurrence of air pockets in the interior, it is possible to suppress the deterioration of the quality of the content liquid, and it is possible to maintain the dispensing operability satisfactorily to the end, regardless of the dispensing posture. It is used as a highly functional storage container in fields such as medicine and food.
[0004]
In addition, the Delami bottle is obtained by co-extrusion of an outer layer and an inner layer that are almost incompatible with each other and extrusion molding into a multi-layer parison, and blow-molding this multi-layer parison. When the inner bag body consisting of the inner layer is reduced in volume as the content liquid decreases, the outer layer and the inner layer may peel off and the inner bag body may fall off in the outer container. Configuration is required.
[0005]
For example, Patent Document 1 relates to a delami bottle, and describes a technique relating to a technique in which a part of the outer layer and the inner layer is made non-peelable by bonding with a vertical belt-like adhesive band over the entire height range between the outer layer and the inner layer. However, such an adhesive band can prevent the inner bag body from falling off.
[0006]
[Patent Document 1]
JP-A-8-26241 [0007]
[Problems to be solved by the invention]
However, in the formation of the adhesive band shown in Patent Document 1, it is necessary to co-extrude a vertical belt-like adhesive layer between the outer layer and the inner layer. It is disadvantageous from the point of productivity related to the necessity of controlling the extrusion molding of the parison to form the band, maintenance of the equipment, and there are also problems in appearance such as the adhesive band may be conspicuous from the outside is there.
[0008]
Therefore, the present invention was created to solve the above-described problems in the prior art, and the object of the present invention is simple and reliable without using an adhesive band and without affecting the appearance. It is to create a configuration for preventing the inner bag body from falling off.
[0009]
[Means for Solving the Problems]
Of the means of the present invention for solving the above problems, the means of the first invention is:
Consists of an outer layer that forms the outer body and an inner layer that is peelably laminated on the outer layer to form an inner bag, and a part of the inner layer bites into the outer layer on the inner peripheral surface of the mouth tube portion. was, the biting portion for preventing falling off of the inner bag is circumferentially provided, in.
[0010]
With the above-described configuration of the first invention , the inner bag body is reliably prevented from falling off by the biting portion formed by part of the inner layer of the inner peripheral surface of the mouth tube portion entering the outer layer. Parts other than the part can be freely reduced in volume, and smooth pouring is ensured until the content liquid is almost exhausted.
[0011]
Since the mouth tube part is formed to be relatively thick, there is no problem in appearance due to the formation of the bite part, and this bite part is plugged into the part of the parison molded in the case mouth part part during blow molding. It can be simultaneously molded by inserting, etc., and can be provided with high productivity without requiring a separate process, and the equipment cost can be kept low.
[0012]
The means of the second invention is that, in the first invention , the biting portion is formed in a state in which a part of the inner layer is bent outward in a folded shape and bites into the outer layer.
[0013]
With the above configuration of the second invention , by making a part of the thin inner layer folded outward in a folded shape, the inner layer can be bitten into the outer layer with a sharp shape, and the inner bag body Dropout can be prevented more reliably.
[0014]
According to a third aspect of the present invention , in the first or second aspect of the invention , there is a protrusion on the outer peripheral surface of the mouth tube portion, and a biting portion is formed at a position facing the protrusion.
[0015]
According to the above-described configuration of the third invention , the biting portion can be formed by inserting a plug into a portion of the parison that is in a fluid state at the time of blow molding and is molded into the casing mouth tube portion. When the resin for the outer layer flows to the portion corresponding to the protruding portion on the outer peripheral surface of the mouth tube portion of the blow molding die so as to be pressed by inserting the plug, a part of the thin inner layer is caused by the flow of the outer layer. The biting portion can be easily formed by deformation.
[0016]
According to a fourth aspect of the present invention , in the first, second or third aspect of the invention , the biting portion is formed circumferentially on the inner peripheral surface of the mouth tube portion.
[0017]
According to the above configuration of the fourth aspect of the invention , the inner bag body is formed by the mouth tube portion of the outer container so that the weight of the content liquid is uniformly dispersed by forming a circumferential biting portion on the inner peripheral surface of the mouth tube portion. However, it can be supported stably.
[0018]
The biting portion may be formed over the entire circumference, or a plurality of biting portions may be arranged on the circumference at equal central angles.
[0019]
According to a fifth aspect of the invention , in the third aspect of the invention , the protrusion is a screw thread engraved on the outer peripheral surface of the mouth tube portion, and the biting portion is formed in a spiral shape on the inner peripheral surface of the mouth tube portion. That's it.
[0020]
According to the above-described configuration of the fifth aspect of the present invention , it is possible to form a protrusion using a screw for attaching a cap or the like, and it is possible to easily form a biting portion over the circumferential length of the screw.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a first embodiment of a casing 1 according to the present invention. This casing 1 is formed of a high-density polyethylene resin and forms an outer casing 7 of the casing 1 and is sufficient. An outer layer 5 that exhibits mechanical strength, and an inner layer 6 that is molded from a nylon resin that is not compatible with high-density polyethylene resin and forms a thin inner bag body 8 that can exhibit sufficient flexibility. It is configured. Of course, the combination of the resin for the outer layer 5 and the inner layer 6 is not limited to the high-density polyethylene and nylon.
[0022]
The housing 1 has a bottomed cylindrical body portion 2 in which a mouth tube portion 3 having a thread 4 engraved on the outer peripheral surface thereof is erected at the upper end, and is formed on the inner peripheral surface of the mouth tube portion 3. A biting portion 11 is formed at a position facing the screw 4 in a state where the inner layer 6 bites into the outer layer 6 in a spiral shape.
[0023]
More specifically, the biting portion 11 is a state in which a part of the inner layer 6 is bent outward in a fold-like shape and bites into the outer layer 5 with the tip slightly upward, and the biting portion 11 allows the inner bag body to be bent. 8 can be reliably prevented from falling off.
[0024]
Such a biting portion 11 can be formed by, for example, blow molding by pushing a plug from above a portion corresponding to the mouth tube portion 3 of the casing 1 of a parison set in a blow molding die. . That is, as the resin for the outer layer 5 in a molten state flows into a portion corresponding to the screw 4 of the housing 1 mouth tube portion 3 of the mold cavity by pushing the plug and the subsequent air blow, the thin inner layer is flown. 6 is bent and deformed into a fold shape, and is in a state of being bitten into the outer layer 5, and the biting portion 11 is formed.
[0025]
FIG. 3 shows a second embodiment of the present invention, which is an example in which a protrusion 12 for locking and assembling a cap or the like is formed instead of the screw 4 of the mouth tube portion 3 in the first claim. FIG. 4 shows a third embodiment in which the lateral protrusions 13 are formed at four positions at an equal central angle. In either case, these protrusions 12 or lateral protrusions on the inner peripheral surface of the mouth tube portion 3 are shown. The biting portion 11 is formed at a position facing the strip 13.
[0026]
In this way, the inner bag body 8 can be effectively prevented from falling off by forming the biting portion 11 in a circumferential shape.
[0027]
Note that the blow molded casing of the present invention as illustrated in each embodiment, so-called delami bottle, is formed by, for example, forming a suction hole for allowing the outside air to enter between the outer layer 5 and the inner layer 6 in the outer container 7, and dispenser pump The cap 7 is used as a dispensing container by attaching a cap, or the outer body 7 is configured to form a flexible outer shell that can be squeezed and restored, and a check valve is arranged in the intake hole, Furthermore, it can be used as a squeeze-type dispensing container by screwing a cap having an open cylindrical part provided with a check valve.
[0028]
【The invention's effect】
Since the present invention has the above-described configuration, the following effects can be obtained.
In the first aspect of the invention , the inner bag body is prevented from falling off by the biting portion formed by the biting portion formed by biting the inner layer into the outer layer of the inner peripheral surface of the mouth tube portion. The portion can be freely reduced in volume, and smooth dispensing is ensured until the content liquid is almost exhausted.
[0029]
In addition, since the mouth tube portion is formed to be relatively thick, there is no problem in appearance due to the formation of the biting portion, and this biting portion is formed in the casing mouth tube portion of the parison that is in a fluid state at the time of blow molding. It can be formed by inserting a plug in a portion to be provided, and can be provided with high productivity without requiring a separate process, and the equipment cost can be kept low.
[0030]
In the second invention , by making a part of the thin inner layer bent outward in a folded shape, the inner layer can be bitten into the outer layer with a sharp shape, Dropout can be prevented more reliably.
[0031]
In the third aspect of the invention , when the resin for the outer layer flows into the portion of the blow molding die that is molded on the protruding portion of the outer peripheral surface of the casing mouth tube portion, a part of the thin inner layer is removed. The biting portion can be easily formed by being deformed as the outer layer flows.
[0032]
In the fourth invention , by forming a circumferential biting portion on the inner peripheral surface of the mouth tube portion, the weight of the content liquid is uniformly dispersed by the mouth tube portion of the outer container body. However, it can be supported stably.
[0033]
In the fifth invention , it is possible to make a protrusion by using a screw for attaching a cap or the like, and it is possible to form a biting portion over the circumferential length of the screw.
[Brief description of the drawings]
FIG. 1 is a half longitudinal front view showing a first embodiment of a housing of the present invention.
FIG. 2 is an enlarged vertical front view of a main part showing the vicinity of a mouth tube part of the housing of FIG. 1;
FIG. 3 is an enlarged front elevational view of a main part showing a second embodiment of the housing of the present invention.
FIG. 4 is an enlarged front elevational view of a main part showing a first embodiment of the housing of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1; Housing 2; Body part 3; Mouth part 4; Screw 5; Outer layer 6; Inner layer 7; Outer body 8; Inner bag body 11; Biting part 12;

Claims (3)

The outer layer (5) forming the outer container (7) and the inner layer (6) forming the inner bag body (8), which is laminated on the outer layer (5) so as to be peeled thinly, 3) A biting portion for preventing the inner bag body (8) from falling off, wherein a part of the inner layer (6) is folded outward and bent into the outer layer (5). (11) A blow-molded casing characterized by being provided around . Periphery of ridges (4) circumferentially in face, projecting Article (4) in the biting portion at a position facing (11) blow molded bottle of claim 1 wherein the circumferentially provided a mouth tube portion (3). Ridges (4) are threaded which are engraved on the outer peripheral surface of the mouth tube section (3), the claims and circumferentially spirally on the inner peripheral surface of the mouth tube portion biting portion (11) (3) The blow-molded housing according to 2 .

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