JP2002205720A - Hollow liquid container enabling liquid content to be completely poured out - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hollow liquid container which is formed by blow-molding a thermoplastic synthetic resin to provide on its body wall annular ribs having irregular shapes, thereby providing a pressure resistance wherein liquid contents in the container can be completely poured out. SOLUTION: A thermoplastic synthetic resin is blow-molded to form a hollow container, and annular ribs each having a semicircular cross section are formed in multiple stages side by side in the circumferential direction on the body wall potion of the container, and a linear groove is formed in the longitudinal direction so as to cross the ribs in such a manner that the surfaces of the rubs are flash with the surface of the groove, thereby forming a fluid passage to pour the liquid in the container without leaving any liquid therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow container formed by blow-molding a thermoplastic synthetic resin suitable for containing a liquid, and more particularly to a body wall portion for imparting pressure resistance to the hollow container. A liquid having a concave-shaped pouring groove for vertically extending the circular rib in the body wall portion, so that the liquid in the container can be completely discharged without remaining. It relates to a hollow container.

[0002]

2. Description of the Related Art In the past, glass bottles and the like were used as containers for containing soy sauce, mirin, edible oil, and the like, but these glass bottles were generally large single bottles. In recent years, various containers made of a thermoplastic synthetic resin have been frequently used for reasons such as changes in family structure and living conditions, distribution, and economics. Hollow containers made of thermoplastic synthetic resin can be easily formed by blow molding, and they do not break like glass bottles due to drop impact, so a large number of containers of various sizes, large and small. And it came to be manufactured at low cost.

[0003] In order to form a hollow container from a thermoplastic synthetic resin, a structure and strength are required that do not cause deformation or breakage due to a load or an impact when the containers are stacked one above the other or when the container is dropped. In addition, since it is required that the container be molded using a synthetic resin that does not cause harmful components to ooze into the contents, the conventionally used polyethylene or vinyl chloride is used for hollow containers for storing foods and drinks. In recent years, in place of resin, those molded using polyethylene terephthalate (PET) resin have come to be used frequently.

A container molded from polyethylene terephthalate resin has no danger of leaching of harmful substances into the liquid in the container like a container made of polyethylene or vinyl chloride resin, and it is also possible to perform a certain degree of stretching and heat treatment. Since it is possible to increase the mechanical strength of the liquid, it is very suitable as a container for storing liquids of food and drink such as juice and soy sauce. However, since polyethylene terephthalate resin is slightly more expensive than other types of resin, the amount of resin used must be reduced in order to reduce the production cost of containers to the level of other resins. Raw material costs must be kept low.

[0005] In order to minimize the amount of resin used in this way, it is necessary to reduce the production cost by eliminating unnecessary waste. It is advisable to mold as thin as possible. In the case of molding with such a low amount of resin used, even if the wall thickness of the container is reduced, the structure must be such that the mechanical strength of the container does not weaken. Is No. 53-27260 and No. 5
As seen in JP-A-6-14172 and the like, a hollow container is formed in a structure in which ribs having irregularities are provided on the body wall of the container in the circumferential direction, and the ribs provide pressure resistance and impact resistance with the body wall. In general, a container designed to be held is used.

The hollow container as seen in the above-mentioned invention can sufficiently withstand the pressure and impact applied in the direction perpendicular to the body wall, but is applied to the container from above and below. It is unavoidable that the buckling force against the compressive force becomes weak, and also, the liquid contained in the hollow container as described above, particularly, a liquid having a slightly viscous property such as edible oil and dressing, should be poured out to the end. However, as shown in FIG. 5, the remaining liquid 13 in the container is
It was impossible to completely pour out the liquid left in the groove of a.

Therefore, eliminating the above-mentioned problems,
The applicant formed a container in which the body wall portion was formed thin so as to have pressure resistance, impact resistance and compression resistance,
It has already been proposed as Japanese Utility Model Publication No. 56-12172. As shown in FIG. 6, a hollow container 21 formed by biaxially stretch-blowing a polyethylene terephthalate resin.
Rib 22 protruding outwardly on the thin body wall portion 22
a is formed in multiple stages in the circumferential direction to provide pressure resistance and impact resistance, and a reinforcing rib projecting from the rib surface so as to cross the circumferential rib 22a and to have a vertically convex shape. 23
Is formed to impart a mechanical strength to a thin-walled hollow container by imparting a reinforcing function to a vertical compressive force and a bending force on the container.

In the above-mentioned invention, when the internal solution is to be poured out from the hollow container 21, if the convex reinforcing ribs 23 provided in the longitudinal direction on the body wall portion are inclined downward,
The liquid in the circumferential rib 22a is guided to the reinforcing rib 23, and the rib can be used as a flow path for discharging the liquid from the opening 24, so that the liquid may remain in the container for the time being. Can be spilled so that there is no
However, since the reinforcing rib 23 is formed so as to protrude from the surface of the rib 22a in the circumferential direction, a molding die becomes slightly complicated, and it takes time and effort to manufacture. The cost of manufacturing the container increases. In the hollow container described above, the reinforcing ribs 23 protruding from the body wall are too conspicuous, so that the design is slightly unsatisfactory, and the reinforcing ribs 23 protrude from the circumferential rib 22a surface. However, there is also a problem that the stress against the lateral force and the bending force is slightly weak.

Therefore, regardless of whether the hollow container is formed into a thin wall or a thick wall, a rib having an uneven shape is formed on the body wall of the container. Are formed in a multistage shape in the circumferential direction so as to increase the mechanical strength, when the inner solution contained in the container is poured out, the solution stays in the concave groove of the rib. There is no, so that it can be poured out to the last drop, the molding of the container is easy, and the manufacturing cost is low,
The appearance of a hollow container with a good appearance in design is desired.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a method for externally transferring a solution contained in a hollow container in which ribs having an uneven shape are continuously formed in a circumferential direction on a body wall of the container in a multistage manner. When pouring out and using, when the hollow container is tilted in order to pour out the remaining inner solution, the structure shall be such that the inner solution does not remain in the concave groove of the rib provided on the body wall. The present invention provides a liquid hollow container capable of discharging all the internal solution.

[0011]

Means for Solving the Problems A thermoplastic synthetic resin is biaxially stretch blow-molded to form a hollow container, and at the same time, an annular rib bulging in a semicircular cross section is formed on the body wall portion of the container in a multistage shape in the circumferential direction. To give pressure resistance and impact resistance continuously, and also to form a concave groove which is linear in the vertical direction so as to cross the annular rib, and a bulged surface of the annular rib. By forming so that the solution present in the annular rib can flow into the straight groove, the solution in the container can be left without leaving the solution in the container by molding so that the straight groove surface is flush with the same surface. Construct a hollow liquid container that can be poured out.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The invention of the present application relates to a method of forming a hollow container by biaxially stretching blow molding a thermoplastic synthetic resin such as polyethylene terephthalate. An annular rib bulging into a multi-stage shape is formed in a continuous manner to provide a structure in which pressure resistance and impact resistance are imparted to the container. A concave groove is formed, and the bulging surface of the annular rib and the linear concave groove surface are formed so as to be flush with each other, and the internal solution contained in the container is poured out to the outside. A hollow liquid container configured to be formed is formed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a hollow container according to the present invention will be described in detail based on an optimal embodiment with reference to the drawings. In the invention of the present application, a hollow container 1 as shown in FIG. 1 is formed by biaxially stretch blow molding a thermoplastic synthetic resin. The hollow container 1 is formed by blow molding into a hollow shape, and at the same time, in order to impart pressure resistance and impact resistance to the container, an annular rib 2 a having a semicircular cross section bulging in the circumferential direction of the body wall portion 2. Are formed continuously in multiple stages, and in order to be able to pour out so as not to leave a residual liquid, a concave groove 3 that is linear in the vertical direction is formed so as to cross the annular rib 2a, As shown in FIG. 2, the annular rib 2a is formed into a structure in which the protruding surface of the annular rib 2a and the surface of the linear groove 3 are flush with each other.

When the hollow container 1 formed into such a structure is filled with various solutions, the amount of the inner solution is reduced while the inner solution is poured out and used. As shown in the figure, the container 1 with reduced content liquid
When the solution is poured while tilting so that the linear groove 3 faces downward, all the solution remaining in the annular rib 2a flows into the linear groove 3 communicating with the annular rib. Flows through the concave groove 3 and passes through the shoulder to be discharged from the opening 4 to the outside.

In the above-described embodiment, the annular rib 2a is connected to the annular rib 2a in order to prevent the solution remaining in the container from remaining in the annular rib 2a so that all of the solution can be poured out of the container. The groove 3 provided so as to communicate is formed as a linear groove, but such a groove 3 has a semicircular bulge and a roundness like the semicircular rib 2a. When formed in the concave groove 3a to form a hollow container as shown in FIG. 4, the flow of the internal solution can be further facilitated, and the concave groove is formed in the body wall of the hollow container. Needless to say, it may be provided at a plurality of places instead of one place.

The invention of the present application described above is the hollow container 1 in which the annular rib 2a whose section is bulged in a semicircular shape is formed on the surface of the body wall 2 in the circumferential direction, so that the pressure resistance against the surface of the body wall 2 is improved. Although it has a certain level of strength in terms of resistance and impact resistance, the point of insufficient strength against buckling stress in the vertical direction is that a linear groove 3 provided in the vertical direction so as to cross the annular rib 2a. The annular rib 2a and the linear groove 3 are connected on the same plane, so that the linear groove can sufficiently withstand bending stress.
It is also suitable for thin containers and containers made of soft materials.
In addition, since the bulging surface of the annular rib 2a provided on the body wall surface 2 and the surface of the linear concave groove 3 are formed on the same surface, processing of a molding die becomes easy.

[0017]

According to the invention of the present application, an annular rib bulging in a semicircular shape in the circumferential direction is formed in multiple stages on a body wall portion of a hollow container obtained by biaxially stretch-blowing a thermoplastic synthetic resin. Since the body wall portion has pressure resistance and impact resistance, a linear groove is formed in the longitudinal direction so as to cross the annular rib, and the linear groove surface and the annular rib are formed. Is formed so as to be flush with the surface, so that the solution remaining in the annular rib is guided into the groove and can be poured out without leaving, and also against the buckling force in the vertical direction. It can provide mechanical strength and can withstand bending stress, and thin-walled containers and containers made of soft materials are more stable than conventional ones. In addition, good looking products can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a side view showing a hollow container of the present invention.

FIG. 2 is a cross-sectional view of the hollow container shown in FIG.

FIG. 3 is a diagram for pouring an internal solution from the hollow container of the present invention.

FIG. 4 is a side view showing a hollow container of another invention of the present application.

FIG. 5 is a view showing that an internal solution is poured out of a conventional hollow container.

FIG. 6 is a side view showing a prior art example of the present invention.

[Explanation of symbols]

 1. Hollow container 2. Body wall 2a. Annular rib 3. Groove 3a. 3. semicircular concave groove Aperture

Claims (3)

[Claims] 1. A hollow container obtained by blow-molding a thermoplastic synthetic resin, wherein a plurality of annular ribs having a semicircular cross section in the circumferential direction are continuously formed on a body wall portion of the hollow container. And an inner solution, wherein a linear groove is formed so as to cross the annular rib in the longitudinal direction, and the rib surface and the groove surface are formed to be the same surface. Liquid hollow container that can be poured out without any residue. 2. The linear groove according to claim 1, wherein the cross-section is formed in a semicircular shape in the same manner as an annular rib. Liquid hollow container. 3. The liquid hollow container according to claim 1, wherein the hollow container is formed of a polyethylene terephthalate resin.