JPH0776352A - Pressure-resistant bottle container - Google Patents

Abstract

PURPOSE:To facilitate recycling, by forming both bottle body and leg with polyethylene terephtalate and fixing these materials by a fitting means. CONSTITUTION:A bottle body 10 and a leg 20 thereof is made of polyethylene terephtarate already set with heat. The leg 20 is pushed in the bottle body 10 from the bottom 11 and fitted thereto with the upper curved part 21 and the upper protrusion 23 of the leg 20, elastically widened. In this way, the upper round part 21 of the leg 20 is fitted to a groove 13 of the bottle body 10 an the upper protrusion 23 is fitted to the upper edge of the fitting protrusion 14 of the bottle body 10 to fix the leg to the bottle body 10. In this state, the whole bottom 11 of the bottle body 10 is contained in the leg 20. The protrusion 23 at the upper side of leg 20 contacts circularly the outer peripheral face of the bottom 11 of bottle body 10 or it is positioned with a little clearance. A connection aperture is formed between the vertical grooves 14 of bottle body and the round part 21 of leg 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-resistant bottle container made of polyethylene terephthalate (hereinafter referred to as a pressure-resistant PET bottle), and in particular, a leg is attached to the bottom of a bottle body having a hemispherical shell shape. It also relates to a pressure-resistant PET bottle.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 5-36310 discloses a pressure resistant PET bottle of this type. FIG. 8 shows a conventional pressure resistant PET bottle 50. In the conventional pressure resistant PET bottle 50, a polyethylene cup-shaped leg body 51 is attached to a hemispherical shell-shaped bottom portion 53 of a polyethylene terephthalate bottle body 52. The supporting portion 54 provided on the leg body 51 was covered with the surface of the bottom portion 53 of the bottle body 52 by hot melt.

In this pressure-resistant PET bottle, when the bottle body 52 is filled with a carbonated beverage (hereinafter referred to as a mixed carbonated beverage) in which fruit juice, milk components and other components are mixed,
After filling the contents in the bottle body 52, the bottle body 5
Hot water is supplied in a shower shape to the outer surface of 2, and the heat is used to sterilize the contents.

After the bottle body 52 is filled with carbonated water at a low temperature, hot water is supplied in a shower shape to the outer surface of the bottle body 52 after the carbonated water is filled so that dew condensation does not occur on the outer surface of the bottle body 52. To warm up.

At the time of performing these treatments, hot water or the like is applied to the legs 51 so that the hot water or hot water also flows on the surface of the bottom portion 53 of the bottle body 52 covered with the legs 51.
An opening 55 for allowing the water to enter the inside and an opening 56 for discharging the hot water and the like flowing into the leg body 51 are provided.

[0006]

However, in the conventional pressure-resistant PET bottle, the bottle body 52 and the leg body 5 are
Since different kinds of resins are used for No. 1 and the adhesive for hot melt for joining them is also different kinds of resins, recycling is difficult.

Further, there is a possibility that the bottle body 52 may be tilted with respect to the leg body 51 due to the softening of the hot melt adhesive. Further, since the legs 51 are cup-shaped and have the bottom plate portion, there is a drawback that the amount of the resin material used is large and the weight is large. Also, the drainage was bad and the water was easy to collect.

Further, when the bottom portion 53 of the bottle main body 52 after the contents are filled is creep-expanded, the leg body 5 having the bottom plate portion
In No. 1, it was difficult for the bottle body 52 to be deformed corresponding to the expansion deformation, and there was a risk of damage.

Further, as is apparent from FIG. 8, the conventional leg body has the ground contact surface diameter d of the leg body smaller than the outer diameter of the bottle body 52, and the stability is poor. The present invention has been made in view of such problems of the conventional technology,
An object of the present invention is to provide a pressure resistant bottle container that can be easily recycled, has excellent stability and safety, and can efficiently perform sterilization processing after filling the contents.

[0010]

The present invention has the following features to attain the object mentioned above. That is, the pressure-resistant bottle container of the present invention has a bottle main body having a bottom protruding in a hemispherical shell shape, and a hollow cylindrical leg body having upper and lower openings attached to the bottle main body so as to surround the hemispherical shell-shaped bottom portion. . Both the bottle body and the legs are made of polyethylene terephthalate. The bottle body and legs are preferably heat set.

An annular engaging groove is provided at the upper edge of the bottom of the bottle body, and an engaging convex portion is provided at a portion spaced downward from the engaging groove. It is preferable that the engaging convex portion has a three-dimensional convex curved surface shape in terms of pressure resistance.

On the other hand, the leg is provided with an inward projection at the upper end thereof, and an inward projection is provided midway in the vertical direction on the inner surface of the leg. The protrusions and the protrusions may be provided in an annular shape so as to go around the leg body, or may be provided discontinuously at predetermined intervals. Then, the projection of the leg is engaged with the engaging groove of the bottle main body, and the protrusion of the leg is engaged with the engaging convex portion of the bottle main body, so that the leg is fitted and fixed to the bottle main body. To do.

It is also possible to provide a flow port in the upper end opening region, which is an assembly portion of the leg body with respect to the bottle body, so that the fluid flowing along the surface of the bottle body can enter the inside of the leg body. For this, a vertical groove that crosses the engaging groove vertically may be formed in the bottle body and the vertical groove may be used as a flow port, or the projections provided on the legs may be discontinuous at predetermined intervals in the circumferential direction. May be provided as a flow port, and a space formed between these protrusions may be used as a flow port, or a window may be opened in the upper portion of the leg and the window may be used as a flow port.

The protrusion is formed in an annular shape on the inner surface of the leg,
You may make it make this protrusion engage with the upper part of the engagement convex part of the said bottle main body. At this time, if the protrusion and the bottom of the bottle main body are in contact with each other or located close to each other with almost no gap, a flow passage is provided at a portion where the protrusion and the bottom of the bottle main body face each other, and the bottom of the bottle main body is provided. Ensure that the fluid flowing along the surface of the bottle flows at a predetermined flow rate to the lowest point on the bottom of the bottle body. Regarding this flow passage, a groove may be provided in the leg body to serve as the flow passage, or a groove may be provided in the bottle body to serve as the flow passage.

By making the shape of the leg vertically symmetrical, the outer diameter of the lower end of the leg can be made substantially the same as the outer diameter of the bottle body, so that stability is improved and the leg body is It can be assembled without considering the vertical direction of the legs when assembling.

[0016]

[Function] The bottle body and the legs are made of the same resin material, and the fixing structure for both members also uses the fitting means.
Since no adhesive is used, the recycling process can be facilitated.

Since the leg has a hollow cylindrical shape and does not have a bottom, the leg can be manufactured with a small amount of resin material, and a lightweight and inexpensive leg can be obtained. In addition, the drainage is good, the liquid does not easily accumulate in the legs, it easily dries, and it is hygienic.

When the contents are sterilized with hot water, the hot water flowing along the outer surface of the bottle body enters the leg through the flow port, travels along the outer surface of the bottom of the bottle body, and passes through the flow passage on the way. It will flow to the bottom of the bottom.

[0019]

Embodiments of the present invention will be described below with reference to the drawings of FIGS. 1 to 5 show a first embodiment of a pressure resistant bottle container according to the present invention. As shown in the overall front view of FIG. 4, a pressure-resistant PET bottle (pressure-resistant bottle container) 1 is composed of a heat-set polyethylene terephthalate bottle body 10 and a heat-set polyethylene terephthalate leg 20. ing.

FIG. 1 is a partially cutaway front view showing the lower part of the pressure-resistant PET bottle 1 in an enlarged manner. As shown in this figure, the bottom portion 11 of the bottle body 10 projects in a hemispherical shell shape, and the bottom portion 11 is formed. A straight body portion 12 is connected above the. An engagement groove 13 is formed in an annular shape between the bottom portion 11 and the body portion 12, and vertical grooves 14 that are deeper than the engagement groove 13 and cross the engagement groove 13 are formed at equal intervals in the circumferential direction. One is provided. Further, the bottom portion 11 is provided with four engaging convex portions 15 which are protruded outward in a three-dimensional convex curved surface shape at positions spaced downward from the respective vertical grooves 14.

On the other hand, the leg body 20 has a hollow, substantially cylindrical shape and is vertically symmetrical, and its outer diameter is substantially the same as the outer diameter of the body portion 12 of the bottle body 10. The upper and lower ends of the leg body 20 have inwardly curved round portions (projections) 21,
22 is formed in an annular shape. Leg 20 is each rounded section 2
A portion that is separated from the first and the second members 22 by a predetermined dimension is annularly constricted, and these are annular projecting portions 23 and 24 that project inward when viewed from the inner surface side of the leg 20.

In this leg 20, the upper rounded portion 21 is fitted into the engaging groove 13 of the bottle body 10, and the upper protruding portion 23 is engaged with the upper edge of the engaging convex portion 15 of the bottle body 10. , Is fixed to the bottle body 10. In this state, the entire bottom portion 11 of the bottle body 10 is housed in the leg body 20, and the upper protruding portion 23 of the leg body 20 contacts the outer peripheral surface of the bottom portion 11 of the bottle body 10 in an annular shape, or , With a slight gap, they are located close to each other. Then, the flow port 16 is formed between the vertical groove 14 of the bottle body 10 and the rounded portion 21 of the leg body 20 (see FIG. 2).

The leg 20 is attached to the bottle body 1
This is achieved by pushing the leg body 20 from the side of the bottom portion 11 of 0 to elastically expand the upper radius portion 21 and the upper protrusion portion 23 of the leg body 20. At this time, since the leg body 20 is vertically symmetrical, the leg body 20 can be attached without any trouble even if it is turned upside down.

FIG. 3 is a cross-sectional view of the protruding portion 23 (24) of the leg body 20. The leg portion 2 is attached to the annular protruding portion 23 (24).
A large number of vertical grooves 25 (26) protruding outward when viewed from the inside of 0 are provided at equal intervals in the circumferential direction. This vertical groove 25,
26 functions as a flow passage as described later.

A pressure-resistant PET bottle 1 constructed in this way
In the above, since the bottle body 10 and the leg body 20 are formed of the same polyethylene terephthalate, and these are fixed by the fitting means without using an adhesive, the recycling process can be facilitated.

Further, since the leg 20 has a substantially cylindrical shape and does not have a bottom portion, the amount of polyethylene terephthalate used as a raw material can be small, and the leg 20 can be made lightweight and inexpensive. Moreover, the bottom-less substantially cylindrical leg 20
Drains well, liquid does not easily collect in the legs 20, easily dries, and is hygienic.

Further, since the legs 20 are vertically symmetrical, the ground contact surface diameter D ₁ can be made almost the same as the outer diameter D ₂ of the body 12 of the bottle body 10, and the pressure resistant PET bottle 1 is set up. Sometimes extremely stable.

In the production line, a large number of standing pressure resistant PET bottles 1 may be brought into contact with each other and transported in a pressed state, and at this time also, the pressure resistant PET bottles 1 are transported.
Since the lower part of the bottle 1 is pushed at the same time, the fall is prevented.

The two constrictions 27, 28 of the leg body 20.
Is convenient for fixing a shrink label or a stretch label to the surface of the leg body 20. In addition, even when the bottom portion 11 of the bottle body 10 after the contents are filled is creep-expanded,
Since the substantially cylindrical leg 20 having no bottom portion is easily deformed in response to the expansion deformation of the bottom portion 11, there is no risk of damage and the safety is high.

Next, the operation of the hot water sterilization process performed after filling the bottle body 10 with the mixed carbonated beverage will be described. The bottle body 10 filled with the mixed carbonated beverage is sealed with an appropriate cap, and hot water is supplied in a shower shape from above the pressure-resistant PET bottle 1 to bring the outer surface of the bottle body 10 into contact with the hot water. The hot water flows down the outer surface of the bottle body 10. Engagement groove 1 of bottle body 10
The hot water reaching 3 enters the inside of the leg body 20 through the circulation port 16 through the vertical groove 14 of the bottle body 10, and the bottle body 1
It flows along the outer surface of the bottom portion 11 of 0, and further flows through each vertical groove 25 on the upper side of the leg body 20 to the lowest point of the bottom portion 11.

As described above, since the hot water also flows in contact with the outer surface of the bottom portion 11 of the bottle body 10, the bottom portion 11 is also heated, and as a result, the contents located inside the bottom portion 11 are also heat-sterilized. The heat sterilization of the contents can be reliably achieved.

FIG. 5 shows an example of a method of manufacturing the leg 20. In this method, a bottle-shaped aggregate 30 in which the legs 20 are connected in multiple stages is blow-molded. This assembly 30 is cut along the line X--X in the drawing by an appropriate means such as laser cutting or hot cutting to obtain the leg 20.
To get The assembly 30 has a mouth portion 31 and a recess portion 32 at the center of the top and the center of the bottom, respectively, so that the leg 20 can be easily centered when the leg 20 is cut.

Such an assembly of legs 20 can also be manufactured by drawing a pipe. However, the manufacturing method of the leg 20 is not limited to these.

Next, a pressure resistant PET bottle 1 according to a second embodiment of the present invention will be described with reference to FIGS. 6 and 7. The leg 20 of the second embodiment has the vertical groove 2 of the first embodiment.
There is no equivalent to 5,26. In the second embodiment, instead of providing the vertical grooves 25, 26 in the leg body 20, a large number of portions are provided in the bottom portion 11 of the bottle body 10 facing the protrusions 23 of the leg body 20 at appropriate intervals in the circumferential direction. The vertical groove 17 is formed, and the vertical groove 17 serves as a flow passage for hot water or the like. Since the other construction is the same as that of the first embodiment, the same reference numerals are given to the same aspect parts and the description thereof will be omitted.

[0035]

As described above, according to the present invention,
Since both the bottle body and the legs are formed of polyethylene terephthalate and the fitting means is used to fix the both members, the excellent effect of easy recycling is achieved.

Since the legs are hollow cylindrical, they are lightweight and
It is possible to obtain an inexpensive pressure-resistant bottle container, and moreover, there is an effect that it is hygienic because the liquid does not easily collect in the legs and is easily dried.

Further, when the legs are vertically symmetrical, they can be attached to the bottle body even if the legs are turned upside down, so that the assembling workability is improved. Further, in this way, the diameter of the grounding surface can be made substantially the same as the outer diameter of the bottle body, so that the pressure-resistant bottle container can be stably erected and the conveyance in the erected state can be stably performed. .

Further, when the flow port is provided in the upper end opening region which is an assembly portion of the leg body to the bottle body, the fluid flowing along the surface of the bottle body can enter the inside of the leg body. it can.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an enlarged lower part of a pressure resistant bottle container according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the engagement groove of the bottle body of the first embodiment.

FIG. 3 is a transverse cross-sectional view of a projecting portion of the leg body according to the first embodiment.

FIG. 4 is an overall front view of a pressure resistant bottle container in the first embodiment.

FIG. 5 shows an example of a method for manufacturing a leg body and is a front view of an assembly of leg bodies.

FIG. 6 is a partially cutaway front view showing an enlarged lower part of a pressure resistant bottle container according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view of the engagement groove of the bottle body according to the second embodiment.

FIG. 8 is a partially cutaway front view of a lower portion of a conventional pressure resistant bottle container.

[Explanation of reference numerals] 1 pressure-resistant PET bottle (pressure-resistant bottle container) 10 bottle body 11 bottom 13 engaging groove 15 engaging convex portion 16 flow port 20 leg 21 rounded portion (protrusion) 23 protruding portion 25 vertical groove (flow passage)

Claims (6)

[Claims] 1. A pressure-resistant bottle container having a polyethylene terephthalate bottle body with a hemispherical shell-shaped bottom and a leg surrounding the bottom attached to the bottom of the bottle body. The engaging groove is provided, and an engaging convex portion is provided at a portion spaced downward from the engaging groove, while the leg body is made of polyethylene terephthalate and has a hollow cylindrical shape with upper and lower openings. An inward projection provided on the upper end of the leg engages with an engagement groove of the bottle body, and an inward protrusion provided on the inner surface of the leg in the up-down direction is an engaging portion of the bottle body. A pressure-resistant bottle container characterized in that it is engaged with a compound convex portion. 2. The pressure-resistant bottle container according to claim 1, wherein the engaging convex portion of the bottle main body has a convex curved surface shape. 3. A circulation port is provided in an upper end opening region, which is an assembly portion of the leg body with respect to the bottle body, for allowing a fluid flowing along a surface of the bottle body to enter the inside of the leg body. The pressure resistant bottle container according to claim 1 or 2. 4. The projecting portion is formed in an annular shape on the inner surface of the leg body, and the projecting portion engages with the upper portion of the engaging convex portion of the bottle body, and the projecting portion and the bottom portion of the bottle body. The pressure-resistant bottle container according to any one of claims 1 to 3, characterized in that a flow passage is provided at a portion facing each other. 5. The pressure resistant bottle container according to claim 1, wherein the legs are vertically symmetrical. 6. The pressure resistant bottle container according to claim 1, wherein the legs are heat set.