JP3336351B2 - Bottle and molding method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner layer forming a deformable inner bag and a releasably laminated inner layer forming an outer layer forming a fixed outer shell. The present invention relates to a synthetic resin blow-molded bottle capable of injecting and using an internal solution without allowing outside air to enter a storage portion, and a method for molding the bottle.

[0002]

2. Description of the Related Art A typical conventional technique of a synthetic resin blow-molded bottle in which an inner layer forming a deformable inner bag is releasably laminated on an outer layer forming a fixed outer shell is described below. There is a technique disclosed in JP-A-5-310265.

According to this prior art, a bottom parting line portion formed by deburring achieved by die cutting formed when blow molding a bottle adheres inner layers to each other, while outer layers adhere to each other. By making use of the fact that it is difficult to adhere, an external force is applied to this bottom parting line part, a slit is formed by separating the outer layers from each other, and the inner solution contained in the inner layer is poured out and used. When the inner bag formed by the inner layer is deformed to reduce the volume, by allowing outside air to enter between the outer layer and the inner layer through this slit, the inner layer can be separated from the outer layer so that the inner layer can be separated. The inner layer undergoes volume reduction deformation.

[0004]

However, in the above-mentioned prior art, a slit as an air inlet is formed along the parting line at the bottom portion functioning as a seat for the bottle. If the mechanical strength is reduced by the opening of the slit, and the pushing operation of the dispensing pump attached to the bottle for dispensing the content liquid, the bottle is distorted and the pushing operation of the dispensing pump becomes difficult. There was a problem.

Further, although the outer layers at the bottom parting line formed by burr molding have a low degree of adhesion but are adhered to each other with a certain degree of strength, the outer layers at the bottom parting line are not adhered to each other. A considerable force is required to peel off the adhesion between the outer layers, so that there is a problem that a great deal of labor and labor are required to form a slit after purchasing a bottle as a product.

Accordingly, the present invention has been made to solve the above-mentioned problems in the prior art, and simply forms an inlet for air between the outer layer and the inner layer in the body of the bottle in advance. It is a technical task to form a part capable of forming the air inlet so that the air inlet can be easily formed in the body of the bottle, and the seat function of the bottom of the bottle by forming the air inlet. It is an object of the present invention to provide a bottle that does not cause a decrease in the water content.

[0007]

A structural means according to the present invention for solving the above-mentioned problems comprises an outer layer made of a synthetic resin for forming a fixed outer shell by blow molding, and an outer layer which is releasably laminated on the outer layer, and has an inner bag. And an inner layer made of a flexible synthetic resin, forming a notch that exposes a part of the inner layer in a vertical narrow band shape in a part of the outer layer over the entire height range of the trunk. It is in having provided.

[0008] It is effective to bond the outer layer and the inner layer with a vertical band-like adhesive band over the entire height range other than the notched portion.

It is desirable to provide two notches symmetrically with respect to the center of the body portion. In this case, it is preferable to provide the adhesive band at two places between the two notches.

It is effective to wind and fix the shrink label around the trunk.

Further, the method of the present invention for solving the above-mentioned problems has a notch portion in the shape of a vertical narrow band which exposes a part of the inner cylinder outside the inner cylinder made of a flexible synthetic resin, A parison in which a synthetic resin outer cylinder that can be peeled off is joined to the inner cylinder is formed by co-extrusion molding.This parison is formed by burr-forming the mouth and bottom from the direction in which the notch is cut off. Blow molding into bottles.

Advantageously, the adhesive band is co-extruded with the inner and outer cylinders to form a parison.

[0013]

In the bottle body, a vertical strip-shaped notch is formed in a part of the outer layer over the entire height range, so that a part of the inner layer is exposed to the outside of the outer layer through the notch. become,
For this reason, since the exposed inner layer portion is easily deformed by the action of the external pressure, the outer layer and the inner layer are easily separated from the intruding portion, which is the side edge portion of the notch, and the outer layer and the inner layer are separated by the separation. An entrance is formed to allow the outside air to enter smoothly.

Therefore, when the content liquid is poured out of the bottle by the pressing operation of the discharge pump attached to the bottle, the reduced pressure generated in the bottle due to the discharge of the content liquid causes the exposed portion of the outer layer to be exposed. A part of the inner layer is easily deformed into a depression.

[0015] Depression of a part of the inner layer exposed in the notch causes a separation between the outer layer and the inner layer at the invading portion, and an entrance for air between the outer layer and the inner layer at the invading portion. It is formed.

[0016] When an air inlet is formed in the entry portion, the air can easily enter between the outer layer and the inner layer, so that the inner layer can be easily separated from the outer layer, and the air is reduced by the reduced pressure generated in the bottle. The volume reduction deformation of the inner layer is smoothly achieved, and the reduced pressure inside the bottle is quickly eliminated.

Since the volume reduction deformation of the inner layer is achieved by peeling the inner layer from the outer layer, the outer layer is not deformed, so that the appearance of the bottle does not change.

The formation of the entrance at the penetration portion, that is, the volume reduction deformation of the inner layer due to the separation of the inner layer from the outer layer,
Since the notch is formed over the entire height range of the body, it can occur from any height position of the body, but due to the effect of the weight of the content liquid, the effect of the weight of this content liquid Starting from the smallest top edge of
It is a constant deformation.

Along the entire height range of the bottle, a vertical narrow band-shaped adhesive layer for bonding and fixing the outer layer and the inner layer is provided in a portion avoiding the notch, and in the portion where the adhesive layer is located, the outer layer is formed. The inner layer cannot be peeled off, and the volume reduction deformation due to the peeling of the inner layer in the outer layer is performed with the portion adhered to the adhesive layer as an immovable portion, thereby reducing the volume reduction deformation of the inner layer. Is restricted to a simple and constant diameter reduction without causing a reduction in the height direction.

A parison to be blow-molded into a bottle is formed by forming a notch in the form of a vertical narrow strip which exposes a part of the inner cylinder to the outer cylinder to form an outer layer outside the cylindrical inner cylinder to be the inner layer. Since the structure is formed by joining and co-extrusion, the outer layer of the bottle blow-molded from the parison has a cutout that exposes a part of the inner layer along the height of the bottle. It is formed by the notch.

When blow molding a parison having an outer cylinder provided with a notch into a bottle, the blow split mold is set in a direction in which the notch is cut off, that is, the notch is positioned on a parting line. Since the mold is clamped and the bottom is naturally formed by burring the mouth, the bottom and the mouth of the blow-molded bottle are not formed with the notch due to the notch, and the bottom and the mouth are not formed. The outer layer portion of the parting line portion of the portion is visually connected integrally, and the cutout portion is formed only in the body of the bottle.

That is, the diameter of the parison formed by co-extrusion of the outer cylinder having the notch with the inner cylinder is set to a value that allows the burr forming at the mouth to be possible. By setting the posture so that the notch is located on the parting line with respect to the mold clamping direction, a normal simple blow molding operation forms a bottle with a notch over the entire height range of the body You can do it.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of a bottle 1 according to the present invention. The bottle 1 is formed of a high-density polyethylene resin, and has sufficient mechanical strength as an outer shell of the bottle 1. The outer layer 5 to be exhibited, the inner layer 6 formed of a nylon resin having no compatibility with the high-density polyethylene resin, and having a sufficient thickness to exhibit sufficient flexibility, and the high-density polyethylene resin and the nylon resin The bottle 1 is formed of an adhesive resin exhibiting sufficient adhesiveness, and is provided over the entire height range of the bottle 1.

Further, the bottle 1 is provided with a thread on the outer peripheral surface thereof to form an assembling portion of a pouring pump (not shown) for the bottle 1, and the mouth 3 has an upper end. And a bottomed cylindrical body 2 having a bottom 4 continuously provided at the lower end thereof. The outer layer 5 of the body 2 has a vertical thin portion over the entire height range of the body 2. Since a pair of band-shaped notches 7 are provided at symmetrical positions with respect to the center axis of the body 2, the inner layer 6 corresponding to the notch 7 is exposed in a vertical narrow band shape over the entire height range of the body 2. In other words, the formation of the notch 7 results in the formation of the intrusion 8 at the contact portions between the outer layer 5 and the inner layer 6 on both side edges of the notch 7.

An adhesive band 9 for adhesively fixing the outer layer 5 and the inner layer 6
Is positioned at a central angle of 90 ° with respect to the central axis of the body 2 with respect to the notch 7 formed in the body 2,
A pair (see FIG. 2) is provided at a position equidistant with respect to.

As described above, the adhesive band 9 is located at a position displaced by a central angle of 90 ° with respect to the notch 7, that is, at a position furthest from the notch 7 along the circumferential direction. Is the place where the peeling of the inner layer 6 from the outer layer 5 generated from the invading portion 8 occurs at the latest time.
The volume reduction deformation while peeling from the outer layer 5 is naturally and smoothly achieved without being affected by the fixing action of the adhesive band 9, and therefore, the volume reduction deformation of the inner layer 6 is
It will be achieved stably and reasonably in a consistent manner.

As shown in FIGS. 4 and 5, this bottle 1 is blow-molded by forming an outer cylinder 11 having a pair of notches 13 at symmetrical positions and a cylindrical shape located inside the outer cylinder 11. Notch 1 between the inner cylinder 12 and the outer cylinder 11 and the inner cylinder 12
A parison 10 is extruded by co-extrusion with a narrow band-like adhesive band 9 located at a position displaced by a central angle of 90 ° with respect to 3, and the parison 10 is blow-molded into a bottle 1 by a blow mold splitting die. .

The diameter of the parison 10 is set to be larger than the diameter of the mouth portion 3 of the bottle 1 to be molded. The blow molding of the parison 10 into the bottle 1 is performed by blow molding. A posture in which the parison 10 is positioned with respect to the split mold, and the notches 13 are positioned in a direction perpendicular to the direction in which the blow molding split mold is clamped, that is, the notch 13
Is positioned on the parting line.

For this reason, since the mouth 3 and the bottom 4 of the bottle 1 are formed by deburring, the notch 7 formed by the notch 13 is not formed in the mouth 3 and the bottom 4. It is formed only on the body portion 2 without burring forming, and FIG.
As is clear from FIG. 7, since the adhesive band 9 is located in the direction of clamping the blow mold split die, the adhesive band 9 is
, The outer layer 5 and the inner layer 6 in the parting line of the bottom 4 which is the cutout portion are bonded and fixed by the adhesive band 9, and the parting line of the bottom 4 is formed. Between the cut edges of the outer layers 5 is fixed by an adhesive band 9, and the outer layer 5 and the inner layer 6 are formed of a releasable synthetic resin material. Prevents decline.

FIGS. 6 and 7 show another embodiment of the bottle 1 according to the present invention, in which the body 2 of the bottle 1 of the embodiment shown in FIGS. The shrink label 14 formed of a resin film is wound and assembled in a covering shape over substantially the entire height range of the body 2.

The shrink label 14 is wound around the body 2 so as to have insufficient mechanical strength in the body 2 of the outer layer 5 caused by the provision of the cutout 7, that is, a push acting on the bottle 1. This reinforces the lack of mechanical strength that the outer layer 5 of the body 2 is easily deformed in the radially expanding direction by the lowering force.

As a result of the shrink label 14 being wound around the body 2, the notch 7 of the body 2 is changed to the shrink label 1.
4, the shoulder 7, which is the upper end of the body 2, remains exposed, so that the inner layer 6 is separated from the outer layer 5 by the shoulder 7. Can be formed without any trouble from the intruding portion 8, and the peeling operation of the inner layer 6 from the outer layer 5 due to the provision of the shrink label 14 is not adversely affected.

In the above embodiment, the bottle 1
Has been described as a two-layer structure of the outer layer 5 and the inner layer 6, but the inner layer 6 is not limited to a single-layer structure. For example, a layer made of a synthetic resin having releasability from the outer layer 5 is provided on the outer side, and the inner layer 6 is provided on the inner side. Needless to say, a layer made of a synthetic resin having excellent content liquid resistance may be laminated.

[0034]

Since the present invention has the above-described structure, the following effects can be obtained. Since the outer layers of the mold bite at the bottom of the bottle were joined together, there was no deterioration in the mechanical strength of the bottom due to the opening at the bottom, and the deterioration of the external mechanical strength And the occurrence of inconveniences such as poor operability of the dispensing pump and unstable seating of the bottle can be eliminated.

[0035] Since the intruding portion forming the air inlet between the outer layer and the inner layer is formed by the cutout formed in the bottle body at the same time as the bottle is formed, after purchasing the bottle as a product, It is not necessary to perform a special handling operation for forming the air inlet, so that the inconvenience such as troublesome handling of the bottle can be eliminated.

Since a notch in the form of a vertical strip forming the intrusion is formed over the entire height range of the trunk including the shoulder and the bottom, the volume reduction deformation of the inner layer in the outer layer is observed through this notch. Thus, the degree of consumption of the content liquid can be accurately determined by observation from outside the bottle.

[0037] Since the notch forming the intrusion portion is formed with an opening over the entire height range of the body portion, peeling of the inner layer from the outer layer can be achieved in a natural and constant form, and thus the inner layer within the outer layer can be formed. The volume reduction deformation according to the consumption of the content liquid is performed in a stable and constant form, whereby the operation of discharging the content liquid by the discharge pump can be stabilized to the end.

Since the mouth and the bottom of the bottle are formed by deburring, the parison having a simple structure in which a notch along the length direction is provided in a part of the outer cylinder is formed by a usual blow molding operation. Thus, it is possible to mold a bottle provided with a cutout only in the body, and thus to easily form a bottle provided with a cutout in the body.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a bottle according to the present invention.

FIG. 2 is a plan sectional view of the embodiment shown in FIG. 1 taken along the line AA.

FIG. 3 is a bottom view of the embodiment shown in FIG. 1;

FIG. 4 is a front view showing one embodiment of a parison blow-molded into a bottle according to the present invention.

FIG. 5 is a plan sectional view of the embodiment of the parison shown in FIG. 4, taken along line BB.

FIG. 6 is a front view showing another embodiment of the bottle of the present invention.

FIG. 7 is a plan cross-sectional view of the embodiment shown in FIG. 6, taken along line CC.

[Explanation of symbols]

 1; Bottle 2; Body 3; Mouth 4; Bottom 5; Outer layer 6; Inner layer 7; Notch 8; Intrusion 9; Adhesive band 10; Parison 11; Outer cylinder 12; Inner cylinder 13; Notch 14 ; Shrink label

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65D 1/02 B65D 77/04 B65D 25/16 B29C 49/22

Claims (7)

(57) [Claims] 1. An outer layer (5) made of synthetic resin forming a fixed outer shell by blow molding, and a flexible synthetic resin layer formed releasably on the outer layer (5) to form an inner bag. A notch (7) which comprises a part of the inner layer (6) in a part of the outer layer (5) over the entire height range of the trunk (2). Bottle opened. 2. The bottle according to claim 1, wherein the outer layer (5) and the inner layer (6) are bonded by a vertical band-like bonding band (9) over the entire height range except for the cutout (7). 3. The bottle according to claim 1, wherein two notches (7) are provided symmetrically with respect to the center of the body (2). 4. A bottle according to claim 3, wherein the adhesive strips (9) are provided at two places between the two cutouts (7). 5. The bottle according to claim 1, wherein a shrink label is wound around the body portion. 6. Outside the inner tube (12) made of a flexible synthetic resin,
A vertical strip-shaped notch (13) exposing a part of the inner cylinder (12)
A parison (10) in which a releasable synthetic resin outer cylinder (11) is joined to the inner cylinder (12) is formed by co-extrusion molding, and the parison (10) is formed by the notch. A method of forming a bottle, wherein the mouth (3) and the bottom (4) are deburred from the direction in which (13) is cut off and blow-molded into the bottle (1). 7. An adhesive band (9) is connected to an inner cylinder (12) and an outer cylinder (11).
7. A parison (10) is formed by co-extrusion together with the resin.
3. The method for molding a bottle according to claim 1.