JP7217406B2 - plastic container - Google Patents

Description

The present invention relates to plastic containers.

2. Description of the Related Art Conventionally, in a plastic container having a mouth-and-neck portion having a discharge port and having a male screw portion and containing viscous ingredients such as mayonnaise and ketchup, it is possible to efficiently push out the contents remaining on the mouth-and-neck portion near the discharge port. Plastic containers have been developed. The flexible container disclosed in Patent Document 1 includes a container body having a shape whose cross-sectional area is narrowed toward the mouth and neck, and a recessed guide line extending from the vicinity of the mouth and neck toward the container body. is formed. Furthermore, the male thread formed on the outer peripheral surface of the mouth-and-neck portion is formed with an intermittent portion lacking the male thread on an extension line from the depression guide line, and the intermittent portion is formed with a concave groove extending toward the discharge port. be.

JP 2007-308195 A

In the plastic container disclosed in Patent Literature 1, the recession guide wire is folded inward by pressing the vicinity of the recession guide wire in the vicinity of the mouth and neck. Therefore, when pushing out the contents in the vicinity of the mouth and neck, it may be difficult for the user to understand because the position to be pressed is determined.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plastic container from which contents left in the vicinity of the mouth and neck can be easily pushed out.

The plastic container of the present invention comprises a container having a bottom, a cylindrical portion formed in a cylindrical shape with a smaller cross-sectional area from the container toward a discharge port than the container, and a connecting portion between the cylindrical portion and the container. a mouth-and-neck portion which is connected to the discharge port via the discharge port, has a male threaded portion formed on an outer periphery thereof, and is formed to have a diameter smaller than that of the cylindrical portion; A gradually reducing portion connected to the cylindrical portion so that the cross-sectional area gradually decreases toward the outlet, and an annular flat portion connecting the gradually reducing portion via an R chamfered portion to the mouth and neck portion on the inner diameter side. , is characterized by having

ADVANTAGE OF THE INVENTION According to this invention, the plastic container which can push out the content which remained in the vicinity of a mouth-and-neck part easily can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the plastic container which concerns on 1st Embodiment of this invention, (a) is a whole perspective view, (b) is an enlarged perspective view around a mouth-and-neck part, (c) is (b). It is an X section expansion perspective view. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a plastic container according to a first embodiment of the present invention, where (a) is a side view of the vicinity of the mouth and neck portion, and (b) is a diagram showing the contour of the IIb-IIb end surface of (a). . FIG. 4 is a diagram showing a plastic container according to a second embodiment of the present invention, where (a) is a side view showing the vicinity of the mouth and neck portion, and (b) is a diagram showing the outer shape at the IIIb-IIIb end surface of (a). be. FIG. 4 is a diagram showing a plastic container according to a third embodiment of the present invention, where (a) is a side view of the vicinity of the mouth and neck portion, and (b) is a diagram showing the outline of the IVb-IVb end surface of (a). , (c) is a perspective view of the vicinity of the mouth and neck. FIG. 4 is a diagram showing a plastic container according to a fourth embodiment of the present invention, where (a) is a side view of the vicinity of the mouth and neck portion, and (b) is a diagram showing the outer shape of (a) on the Vb-Vb end surface. , (c) is a perspective view of the vicinity of the mouth and neck. FIG. 10 is a diagram showing a plastic container according to a fifth embodiment of the present invention, in which (a) is a side view of the vicinity of the mouth and neck portion, and (b) is a diagram showing the outline at the VIb-VIb end surface of (a). , (c) is a perspective view of the vicinity of the mouth and neck. 1 is a side view showing the entirety of a known plastic container; FIG. 5 is a graph showing simulation results when the vicinity of the mouth/neck portion (around the connecting portion) of the plastic container according to the embodiment of the present invention and a known plastic container are pressed.

(First embodiment)
Next, a first embodiment of the present invention will be described based on FIGS. 1 and 2. FIG. The plastic container 1 is a container for storing highly viscous foods such as mayonnaise and ketchup. The plastic container 1 is formed by blow molding. The plastic container 1 has a housing portion 10 , a cylindrical portion 20 and a mouth/neck portion 30 . The mouth/neck portion 30 has a discharge port 31, is formed with a male screw portion 38, and is attached by screwing a cap 50 shown in FIG. 2(a).

The housing portion 10 has a substantially elliptical flat bottom portion 11 , and an internal space is formed toward the discharge port 31 following the substantially elliptical shape of the bottom portion 11 . The cylindrical portion 20 having a substantially circular cross section and the housing portion 10 are connected by deforming the housing portion 10 so that the cross section thereof gradually becomes circular.

The mouth/neck portion 30 is connected to the tubular portion 20 via the connecting portion 40 . The mouth/neck portion 30 is formed in a substantially cylindrical shape with a smaller diameter than the cylindrical portion 20 . As described above, the external threaded portion 38 is formed on the outer peripheral surface of the mouth/neck portion 30 , and the upper end portion of the mouth/neck portion 30 is opened to serve as the discharge port 31 . The mouth/neck portion 30 is formed thicker than the accommodating portion 10 and the cylindrical portion 20 in order to secure fitting strength when attaching the cap 50 . As the thickness of the mouth/neck portion 30 increases, the thickness of the connecting portion 40 and the portion of the cylindrical portion 20 connected to the connecting portion 40 gradually increases throughout the mouth/neck portion 30. It is formed.

The connecting portion 40 that connects the cylindrical portion 20 and the mouth/neck portion 30 is connected to the gradually reducing portion 41 whose cross-sectional area is gradually reduced toward the discharge port 31 and the gradually reducing portion 41 via the R-chamfered portion 42 . and an annular flat portion 43 connected to the mouth/neck portion 30 on the inner diameter side.

The gradually contracting portion 41 is formed in an uneven wave shape in which a convex portion 41a and a concave portion 41b are continuous in an annular shape. The convex portion 41 a and the concave portion 41 b are formed in a tapered shape so as to narrow toward the ejection port 31 . Each of the convex portions 41a and the concave portions 41b is arranged alternately and continuously at eight locations around the axis at equal intervals. Further, a tapered region 41c formed in a tapered shape so as to have a smaller diameter than the cylindrical portion 20 is formed on the cylindrical portion 20 side from the portion where the convex portion 41a and the concave portion 41b are formed. In this manner, the gradually reduced portion 41 is formed so that the cross-sectional area is gradually reduced.

The convex portion 41a is formed in a convex arc shape in a cross-sectional view (see FIG. 2(b)). The concave portion 41b is composed of an inclined connection portion 41b1 that is linearly inclined and connected to the convex portion 41a in a cross-sectional view, and a straight connection portion 41b2 that is linearly connected between the inclined connection portions 41b1 in a cross-sectional view.

The R-chamfered portion 42 is a portion that is R-chamfered with a predetermined R-chamfer radius so as to smoothly connect the connection portion 40 and the mouth/neck portion 30 . Of the R-chamfered portion 42, the portion connected to the convex portion 41a includes a first R-chamfered portion 42a formed in an annular shape connecting to the ends of the convex portion 41a and the concave portion 41b, and a first R-chamfered portion connected to the convex portion 41a. A second R-chamfered portion 42b connected to the portion 42a and having a larger R-chamfered radius than the first R-chamfered portion 42a is formed. The second R-chamfered portion 42 b connects with an annular flat portion 43 that is a flat surface perpendicular to the axis of the mouth/neck portion 30 . This annular flat portion 43 is connected to the rounded corner portion 32 at the proximal end portion of the mouth/neck portion 30 . On the other hand, the portion of the R chamfer 42 that is connected to the concave portion 41b is connected to the first R chamfer 42a that is also connected to the convex portion 41a. Connect with

Therefore, since the annular flat portion 43 is formed at a location where the convex portion 41a is connected via the first R-chamfered portion 42a and the second R-chamfered portion 42b, in plan view, it is around the mouth and neck portion 30 (in other words, around the axis). ) will be arranged intermittently.

(Second embodiment)
Next, a second embodiment of the present invention will be described based on FIG. In addition, since the form of the accommodating part 10 is the same in subsequent embodiment, the description and illustration are abbreviate|omitted. Similarly, in the following embodiments, the same parts are denoted by the same reference numerals, and the description thereof is simplified or omitted.

A connecting portion 40A in the present embodiment, which connects the tubular portion 20 and the mouth/neck portion 30 of the plastic container 1A according to the present embodiment, includes a gradually reducing portion 41A, an R-chamfered portion 42A, and an annular flat portion 43A. . The gradually contracting portion 41A has a tapered shape that narrows toward the ejection port 31 . More specifically, the gradually reducing portion 41A is set in two stages so that the taper angle on the mouth/neck portion 30 side is larger than the taper angle on the cylindrical portion 20 side. The cross section of the gradually reducing portion 41A is circular, and the cross section gradually reduces toward the discharge port 31. As shown in FIG. This gradually reduced portion 41A is connected to the R chamfered portion 42A. The R chamfered portion 42A connects with the annular flat portion 43A. The annular flat portion 43A is a flat surface that is annularly formed continuously around the axis. The annular flat portion 43A connects with the rounded corner portion 32 at the base of the mouth/neck portion 30 .

(Third embodiment)
Next, a third embodiment of the present invention will be described based on FIG. A connecting portion 40B in the present embodiment, which connects the cylindrical portion 20 and the mouth/neck portion 30 of the plastic container 1B according to the present embodiment, includes a gradually reducing portion 41B, an R-chamfered portion 42B, and an annular flat portion 43B. . The gradually contracting portion 41B is tapered toward the discharge port 31 and has an annular corrugated shape. That is, the gradually contracting portion 41B is provided with a convex portion 41Ba and a concave portion 41Bb, thereby forming a corrugated shape. The convex portion 41Ba is formed in a convex circular arc shape when viewed in cross section. The concave portion 41Bb includes an inclined connection portion 41Bb1 that linearly inclines and connects to the convex portion 41Ba in a cross-sectional view, and a straight connection portion 41Bb2 that linearly connects the inclined connection portions 41Bb1. The gradually contracting portion 41B is connected to the annular flat portion 43B via an R-chamfered portion 42B that continuously connects the end portions of the convex portion 41Ba and the concave portion 41Bb. The annular flat portion 43B is connected to the mouth/neck portion 30 via the corner R portion 32 on the inner diameter side.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described based on FIG. A connecting portion 40C in the present embodiment, which connects the tubular portion 20 and the mouth/neck portion 30 of the plastic container 1C according to the present embodiment, includes a gradually reducing portion 41C, an R-chamfered portion 42C, and an annular flat portion 43C. . Four concave portions 41Ca are formed at equal intervals around the axis in the gradually contracting portion 41C. Therefore, the rounded chamfered portion 42C connecting the gradually reduced portion 41C and the annular flat portion 43C is formed in an intermittent annular shape by the concave portion 41Ca.

A concave portion 41Ca of the gradually reducing portion 41C is formed with an axially inclined surface 41Ca1 that is inclined in the inner diameter direction from the surface of the cylindrical portion 20 toward the discharge port 31 side. The axial inclined surface 41Ca1 is formed so as to gradually narrow. The axially inclined surface 41Ca1 is axially connected to the bottom surface 41Ca2. The bottom surface 41Ca2 is slightly inclined in the radial direction toward the discharge port 31 and formed in a substantially flat surface shape. In the axial direction of the concave portion 41Ca, an axial inclined surface 41Ca1 and an axial inclined surface 41Ca3 connected to the bottom surface 41Ca2 are formed. An end portion of the bottom surface 41Ca2 is connected to the annular flat portion 43C, and an end portion of the axially inclined surface 41Ca3 is connected to the R chamfered portion 42C.

In this manner, the axially inclined surface 41Ca1 and the circumferentially inclined surface 41Ca3 are inclined, and the bottom surface 41Ca2 is inclined toward the inner diameter direction. is formed to gradually shrink.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described based on FIG. A connecting portion 40D in the present embodiment, which connects the tubular portion 20 and the mouth/neck portion 30 of the plastic container 1D according to the present embodiment, includes a gradually reducing portion 41D, an R-chamfered portion 42D, and an annular flat portion 43D. . The gradually reducing portion 41D is provided with a scraping flat surface 41Da that is formed flat by shaving the outer periphery of the cylindrical portion 20 so that the discharge port 31 side faces the inner diameter direction, and is annularly provided around the axis. Therefore, the scraping flat surface 41Da on the cylindrical portion 20 side has a wave shape in a side view annularly formed around the axis. Ridge portions 41Db are formed on adjacent scraping flat surfaces 41Da. Since the scraping flat surface 41Da is formed to be inclined in the radial direction toward the discharge port 31, the gradually reduced portion 41D is formed in a tapered shape so that the cross-sectional area is gradually reduced toward the discharge port 31.

(Test results)
Next, the results of a simulation of pressing the connection portions 40, 40A to 40D, 40Q of the plastic containers 1, 1A to 1D according to the present invention and the known plastic container 1Q will be described. In this test, the reaction force when the connection parts 40, 40A to 40D, and 40Q near the mouth and neck part 30 are pressed is measured, and the contents remaining from the mouth and neck part 30 to the connection parts 40, 40A to 40D, and 40Q are measured. It compares the ease of extrusion. Here, in a known plastic container 1Q, as shown in FIG. 7, a connecting portion 40Q that connects the tubular portion 20 and the mouth/neck portion 30 is formed in a tubular shape having the same circular cross-sectional shape as the tubular portion 20. Thus, an annular flat surface 43Q is formed at the upper end of the connecting portion 40Q.

Here, for the plastic containers 1, 1A to 1D, and 1Q related to the simulation, a container in which the discharge port 31 of the mouth/neck portion 30 has a diameter (aperture) of 20 mm was used. The connection portions 40, 40A to 40D, and 40Q are pressed at a position 20 mm from the end of the mouth-and-neck portion 30, and are crushed by a load member having a diameter of 10 mm arranged facing each other, and the amount of deformation is 20 mm (that is, the discharge port 31 are crushed and come into contact with each other).

FIG. 8 is a graph summarizing the simulation results. In the plastic container 1 of FIGS. 1 and 2, when the amount of deformation exceeded about 6 mm, the amount of deformation gradually decreased to about 17 mm, and then increased slightly. It is shown that the plastic container 1 can be pressed with the lowest force among the plastic containers 1, 1A to 1D, and 1Q when the amount of deformation is about 7 mm or more. Therefore, in the plastic containers 1, 1A to 1D, and 1Q, it can be said that the plastic container 1 is the easiest to push out the contents remaining in the vicinity of the mouth/neck portion 30. FIG. The reaction force at a deformation amount of 20 mm decreased in the order of plastic containers 1, 1A, 1B, 1D, 1C and 1Q.

The plastic container 1A shown in FIG. 3 has a relatively simple tapered gradually contracting portion 41A, and the plastic container 1B shown in FIG. 4 has a corrugated gradually contracting portion 41B. The plastic container 1 is provided with a gradually contracting portion 41 that fuses the two shapes. Therefore, when the connecting portion 40 near the mouth/neck portion 30 is pressed, the tapered shape alleviates the repulsive force from the thick mouth/neck portion 30 and makes it easier to be crushed by the corrugated concave portions. Moreover, any place around the connecting portion 40 can be pressed, and there is no restriction on the place to be pressed.

In addition, the plastic containers 1, 1A to 1D according to the present invention all exhibited a reaction force lower than that of the plastic container 1Q, which is known as the prior art. On the other hand, since the appearance of the container is also important, the design of the corrugated gradually contracting portions 41 and 41B and the gradually contracting portion 41D may be highly evaluated. In addition, the gradual contraction portion 41A of the simple-shaped plastic container 1A may also be evaluated. Further, when filling the container with the contents, the concave portion 41Ca of the plastic container 1C may be used as an engagement portion with the filling nozzle.

Although the size of the plastic container 1, 1A to 1D according to the present invention is not limited, it is particularly suitable for a container with a small diameter discharge port 31 that makes it difficult to discharge the contents remaining around the mouth/neck portion 31. As shown in the above simulation results, the plastic containers 1, 1A-1D according to the present invention are suitable for plastic containers 1, 1A-1D having a diameter of 30 mm or less, preferably 25 mm or less, more preferably 20 mm or less. In this case, the capacity of the plastic containers 1, 1A to 1D is 50 cm ³ to 150 cm ³ (100 g or less, preferably 50 g or less as content capacity).

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can be implemented with appropriate modifications. For example, grooves are provided along the axial direction on the outer circumference of the mouth and neck portion 30, and grooves are also provided along the axial direction in the connection portions 40, 40A to 40D to facilitate breakage when pressed, thereby increasing the pressing force. can also be lowered.

1, 1A to 1D, 1Q Plastic container 10 Accommodating portion 11 Bottom portion 20 Cylinder portion 30 Mouth-neck portion 31 Discharge port 32 Corner R portion 38 Male screw portion 40, 40A to 40D, 40Q Connection portion 41, 41A to 41D Gradual reduction portion 41Ba Convex Part 41Bb Recessed portion 41Bb1 Inclined connection portion 41Bb2 Straight connection portion 41Ca Concave portion 41Ca1 Axial inclined surface 41Ca2 Bottom surface 41Ca3 Axis direction inclined surface 41Da Flat surface 41Db Ridge portion 41a Convex portion 41b Concave portion 41b1 Inclined connection portion 41b2 Straight connection portion 41c Tapered region 42 , 42A to 42D R chamfered portion 42a First R chamfered portion 42b Second R chamfered portion 43, 43A to 43D, 43Q Annular flat portion 50 Cap

Claims (1)

a container having a bottom;
a tubular portion formed in a tubular shape with a cross-sectional area smaller than that of the accommodating portion toward the outlet from the accommodating portion;
a mouth-and-neck portion which is connected to the cylindrical portion via a connecting portion, has the discharge port, has a male thread formed on an outer periphery thereof, and is formed to have a diameter smaller than that of the cylindrical portion;
has
The connecting portion includes a gradually reducing portion connected to the cylindrical portion so that the cross-sectional area gradually decreases toward the discharge port, and a gradually reducing portion connected to the cylindrical portion via an R-chamfered portion to connect to the mouth and neck portion on the inner diameter side. an annular plateau connecting with
has
The gradually reducing portion is formed in a tapered shape that narrows toward the discharge port, and includes a convex portion having a convex arc shape in cross section, an inclined connection portion that is linearly connected to the convex portion in a horizontal cross-sectional view, and the inclined connection. An annular concave-convex wave shape is formed by a concave portion composed of a linear connection portion that connects the portions in a straight line,
The R-chamfered portion connected to the convex portion includes a first R-chamfered portion formed continuously with the recessed portion in an annular shape, and a larger R-chamfering radius than the first R-chamfered portion continuously formed from the first R-chamfered portion. and a second R chamfer having an R chamfer radius,
The R-chamfered portion in the recess is continuous with the first R-chamfered portion and directly connected to the mouth and neck portion,
The plastic container, wherein the annular flat portion is a flat surface intermittently arranged around the mouth/neck portion connected to the second R-chamfered portion.

Images