JP2000318721A - Easily-openable blow molding container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blow-molding container in which an elongated neck continuously connected to a barrel section can be easily cut away at the midway part of it. SOLUTION: This container is comprised of a barrel section 1; a neck section 2 continuously connected with the barrel section 1; a cut section 4 formed to be wound around the neck section 2; and a knob piece 5 formed to be adjacent to the cut section 4 at the neck section 2 of the tip side from the cut section 4. The cut section 4 is torn out with the knob piece 5 to open an easily openable blow-molding container. In this case, the inner surface of the cut section 4 is comprised of two surfaces crossed to each other at the deepest part of the cut section 4 and at least one of the two surfaces is a curved surface bulged outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow-molded container which can be easily opened by tearing a cut portion provided in a middle portion of an elongated neck portion.

[0002]

2. Description of the Related Art Blow-molded containers have been used in the field of toy confectionery containing frozen confectionery. This blow-molded container has an elongated neck attached to the body, and the tip of the neck is sealed. ing. FIG. 5 is an explanatory view of a conventional easy-opening blow-molded container opening means. Until now, various opening means as shown in FIG. 5 have been proposed. For example, Japanese Unexamined Utility Model Publication No. 53-45147 discloses an annular stenosis portion 14 provided on a neck portion 12 narrower than a body portion 1 as shown in FIG.
5, a narrow-bottle-shaped blow-molded container that is pulled open from the annular stenosis 14 to open it has been proposed. Also,
In Japanese Utility Model Laid-Open Publication No. 58-54332, as shown in FIG. 5B, an annular bent portion 14 is provided on the elongated neck portion 12 at a position where the center axis thereof is eccentric with the center axis of the neck portion 12.
A thin-necked bottle-shaped blow-molded container has been proposed in which a thick knob 15 is provided in the most concave portion 16 of the annular bent portion 14 and is pulled to facilitate opening. Further, Japanese Patent Laid-Open No. 9-1
Although the cut portion is not shown in JP-A-83457, the cut angle of the cut portion also provided in the neck in an annular shape is 31 degrees or less, preferably 20 to 30 degrees, and the step of the cut is A narrow-bottle-shaped blow-molded container having a (depth) of 1 mm or more, preferably 1 to 3 mm has been proposed. In these blow molded containers,
Although the names are different from "annular constriction part", "most concave part of fold part", and "cut part", these are all groove-shaped concave parts surrounding an elongated neck part in a ring shape (Japanese Utility Model Application Laid-Open No. 58-54332). , Which includes a convex portion), and by pulling a handle or a knob attached to the upper portion thereof, stress is concentrated on the deepest portion of the concave portion immediately below it, thereby enabling tearing therefrom. is there.

[0003]

However, if the deepest part of the cut where the tear occurs is sufficiently thinner than the other part of the neck, the tear becomes easy, but the cross-sectional shape of the cut as in the past is easy. However, if the shape is simply V-shaped as shown in the figure, there is a problem that the structure does not become thinner unless the depth is increased, requires force for tearing, and is difficult to open for children and the elderly. . Further, if the opening cannot be performed smoothly, the contents melt at body temperature while the opening is being performed, and there is still a problem that the contents liquid is scattered at the moment of opening. Furthermore, even if the thickness can be reduced, some stress acts on it until it is actually used, and it is opened carelessly. There is a problem that impairs the protection function. The present invention has been made in view of the above problems, and can be easily and stably opened even with a weak force,
An object of the present invention is to provide a blow-molded container which is not opened carelessly until the time of opening, and in which a pinhole is hardly generated at the opening start point.

[0004]

An easily-openable blow-molded container according to the present invention comprises a body, a neck connected to the body, a notch formed around the neck, An easy-opening blow-molded container, comprising: a knob piece formed adjacent to the notch portion at the neck portion on the tip side of the notch portion; and tearing off the notch portion with the knob piece to open. The inner surface of the cut portion is formed of two surfaces intersecting at the deepest portion of the cut portion, and at least one of the surfaces is a curved surface bulging outward. Further, the knob has an end side extending from the point adjacent to the cut portion toward the trunk side, and the end side and the side wall of the neck on the trunk side are kept at an acute angle. It is characterized by having. Further, a tearable thin film was formed at a portion surrounded by the edge on the surface radiating from the central axis of the neck, the inner surface of the cut portion, and the side wall of the neck on the trunk portion side. It is characterized by the following.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the drawings. FIG. 1 is a schematic explanatory view of an easily-openable blow-molded container according to the present invention. 1 (a) and 1 (b)
FIG. 2 is a front view and a side view of the easily-openable blow-molded container 10 according to the present invention. As shown in FIG. 1, an easy-open blow-molded container 10 according to the present invention has an elongated neck 2 attached to a body 1.
Are integrally connected, and a seal portion 3 is provided at an upper end portion of the neck portion 2, and a notch portion 4 for orbiting the neck portion is provided in an annular shape in the middle stage. The neck portion 2 is cylindrical before filling the contents, but after filling, in a state where the sealing portion 3 is horizontally sealed at the tip thereof, the horizontal cross section of the portion having the cut portion 4 is deformed into an elliptical shape. are doing. In addition, a knob piece 5 thicker than the container body is integrally formed in the longitudinal direction of the neck 2 by being simultaneously formed at the time of blow molding. The lower end of the attachment position is adjacent to the cutout 4, and further, an end side 6 of the knob 5 extending from the adjacent point toward the body is formed. The side wall on the trunk side is kept at an acute angle. Such a mounting position and a shape of the knob 5 are preferable because when the knob 5 is lifted in the direction of the arrow, the shear stress is easily concentrated on the deepest portion 7 of the cut portion 4 (see the next figure). is there.

FIG. 2 is an enlarged sectional view of a cut portion of the easily-openable blow-molded container according to the present invention. The inner surface of the cutout 4 of the easily-openable blow-molded container according to the present invention is composed of two surfaces intersecting at the deepest part 7, at least one of which has a curved surface bulging outward. Accordingly, as shown in FIG. 2, the cross-sectional shape of the notch 4 appearing on the radiation surface from the central axis of the neck 2 is a curve in which at least one of the two lines intersecting at the deepest part 7 bulges outward. I have. The notch 4 shown in FIG. 2 (a) has a cross-sectional shape on the tip side of the neck portion 2 having an arc shape having a predetermined radius of curvature, and a shape on the trunk portion is horizontal or slightly inclined outward. It is connected to the torso via a small radius. FIG.
The cut portion 4 shown in (b) has a cross-sectional shape on the tip side of the neck portion 2 that is horizontal or slightly inclined outward, and the shape on the body portion side is an arc shape having a predetermined radius of curvature. In addition, the cut portion 4 shown in FIG. 3 (c) has both shapes curved. In this way, by making the cross-sectional shape of the cut portion 4 not a simple V-shape, but at least one of the upper and lower curves so as to bulge outward, the cut angle can converge to 0 as much as possible. It becomes easy to concentrate the shear stress on the deepest part 7 of 4. Further, such a reduction in the cutting angle at the deepest portion can be achieved even when the depth is shallow. In fact, when the conventional V-shaped notch is compared with the notch 4 according to the present invention, the tearing of the notch 4 can be started with a weaker force according to the present invention. Thus, the notch 4
Ideally, the tear starting from one point on the side of the knob 5 of the deepest part 7 propagates along the cut 4 around both the left and right, and finally merges on the opposite side of the knob 5 and ends. is there. However, often, either the right or left tear is out of the range of the notch 4 and enters the neck 2 on the upper end side in the figure, so that it is impossible to cut the neck 2 only with the notch 4. The end happens. Further, even if the cut is finally made, a part of the side wall of the neck portion 2 remains in the cut portion 4, and a cut state far from a complete horizontal cut in the target cut portion 4 is obtained. It may not be able to serve as a mouthpiece. The optimum shape of the cut portion 4 for avoiding the occurrence of such an irregular tear is as shown in FIG. That is, the parison part having the predetermined length P is equally divided into two parts vertically with the deepest part 7 of the cut part 4 as a boundary.
On the other hand, the portion L2 in which a part of the neck portion 2 is added to the straight portion of the cut portion 4 via a small radius is molded with the same amount of resin, but the path of L1 is shorter than that of L2. As a result, the thickness becomes thick, and the tearing from the cut portion 4 to the neck portion 2 on the distal end side becomes difficult to propagate.

FIG. 3 is an explanatory view of means for preventing unintentional opening of the easily-openable blow-molded container according to the present invention before use.
In the easily-openable blow-molded container 10 according to the present invention,
By making it easier to open with a weak force, conversely, some stress may act on the deepest part 7 of the cutout 4 and cause careless opening before use. There is a problem that it occurs in the deepest part 7 and impairs the protection function as a packaging container. To avoid this,
In the present invention, as shown in FIG.
In a space surrounded by the inner surface of the cut portion 4 and the side wall of the neck portion 2 on the body portion side, the thickness can be easily cut off along the radiation surface from the central axis of the neck portion 0. The thin film 8 in the range of 20 to 0.40 mm is integrally formed. For reference, the thickness of the cutout 4 is preferably in the range of 0.28 to 0.32 mm. The resistance to tearing of the thin film 8 thus provided can be controlled by appropriately changing the thickness, shape, and area of the thin film 8.

An easily openable blow molded container 10 according to the present invention.
The density is 0.918 to 0.926 g / cm ^{3 in} consideration of openability by hand, suitability for pushing out the contents, moldability, and the like.
Low-density polyethylene resin can be suitably used. In the blow molding of the blow molded container 10 according to the present invention,
The notch 4 can be formed by previously forming an annular protrusion having a shape as shown in FIG. 2 on the split mold, and the knob 5 and the thin film 8 can be formed as desired. It is integrally formed by utilizing the part that is burred. The molding process is substantially the same as ordinary blow molding. That is, the parison is vertically extruded from the extruder into the middle of the left and right split dies, sandwiched between the split dies from both sides, and then high-pressure air is blown into the parison whose top and bottom are closed. At this time, the parison spreads over the entire inner wall of the cavity, and the cutout 4 according to the present invention is formed substantially according to a mold. In addition, the knob 5 and the thin film 8 are formed simultaneously outside the cavity, and the periphery thereof is cut off to form burrs. The burrs on the upper end of the shoulder 2 are cut by a cutter blade incorporated in the mold during cooling. Then, after cooling, the mold is opened and the easy-opening blow-molded container 10 is opened.
Is taken out. The blowing of the high-pressure air is performed through a blow pin pierced into a blow pin receiving portion provided outside a mold portion for forming the blow molded portion. In the above blow molding, stable production can be performed extremely efficiently by using a rotary blow molding machine.

[0009]

FIG. 4 is a dimensional view of an embodiment of an easily-openable blow-molded container according to the present invention. As shown in FIG. 4, the notch 4 for imparting easy opening property
The width and the step (depth) of the neck portion 2 in the longitudinal direction are each set to 0.
9 mm, so that an arc having a radius of curvature of 1.2 mm appears in the cross-sectional shape of the notch 4 on the tip side of the neck 2. In addition,
The average thickness of the body 1 and the neck 2 is 0.34 mm, respectively.
0.35 mm. Also, the basis weight is 8.0-9.0 g,
The internal volume is 200 cc 7 mm below the cut 4.
Outside the cut portion 4, a thin film 8 having a thickness of 0.30 mm was provided in a region as shown in FIG. Comparison of the above sample with a commercially available easy-opening blow-molded container revealed that the sample can be easily and stably opened with a weaker force. In addition, even if some force acts on the cut portion 4 on the side of the knob piece 5, it does not open when the force does not reach the force to tear the thin film 8, and it has been proved that careless opening does not easily occur. .

The blow tube container 10 according to the present invention comprises:
Without being limited to the description of the above embodiment, various modifications can be made without departing from the gist of the present invention.
For example, the shape of the easily-openable blow-molded container 10 according to the present invention is not limited to a symmetrical container as shown in FIG. 1, but a deformed bottle in which the neck 2 extends obliquely from the body 1. Alternatively, the horizontal cross-sectional shape of the neck 2 can be arbitrarily selected.

[0011]

According to the present invention, an annular cut portion 4 is provided in the middle of an elongated neck portion, and at least one of the upper and lower cross-sectional shapes of the cut portion 4 appearing on the radiation surface from the central axis of the neck portion is curved. Thus, it is possible to tear along the cut with a weaker force than the conventional one. Further, a thickness of 0.1 mm which can be easily torn in a space surrounded by the end side 6 of the knob piece 5 and the side wall of the neck 2 including the cutout 4 along the radiation surface from the central axis of the neck 2. 20 ~
By integrally molding the thin film 8 in the range of 0.40 mm, it is possible to eliminate a possibility that some stress acts before use until the thin film 8 is opened carelessly.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of an easily-openable blow-molded container according to the present invention.

FIG. 2 is an enlarged sectional view of a cut portion of the easily-openable blow-molded container according to the present invention.

FIG. 3 is an explanatory view of an inadvertent opening prevention means before use of the easy-opening blow-molded container according to the present invention.

FIG. 4 is a dimensional view of one embodiment of an easily-openable blow-molded container according to the present invention.

FIG. 5 is an explanatory view of a conventional easy-opening blow-molding container opening means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body part 2 Neck part 3 Seal part 4 Notch part 5 Knob piece 6 Edge 7 Deepest part 8 Thin film 10 Easy-opening blow-molded container according to the present invention 20 Conventional easy-openable blow-molded container

Claims (3)

[Claims] 1. A torso, a neck formed in connection with the torso, a notch formed around the neck, and a neck adjacent to the notch at a tip end side of the notch. An easy-opening blow-molded container comprising a knob piece formed by tearing the notch portion and opening the knob with the knob piece, wherein the inner surface of the notch portion intersects at the deepest portion of the notch portion. An easily-openable blow-molded container comprising two surfaces, at least one of which is a curved surface bulging outward. 2. The knob piece has an end side extending toward the body from a point adjacent to the notch, and the end and the side wall of the neck at the body at an acute angle. 2. The easy-opening blow-molded container according to claim 1, wherein the container is kept. 3. A portion of the tearable thin film surrounded by the edge on the surface radiating from the central axis of the neck, the inner surface of the cut portion, and the side wall of the neck on the trunk portion side. The easy-opening blow-molded container according to claim 2, wherein the container is formed.