JP2010052814A - Synthetic resin round bottle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic resin round bottle which has a tapered shoulder whose circumferential wall surface rigidity is increased, retains sufficient surface rigidity despite reduced wall thickness, causes no trouble on manufacturing lines, vending machines, etc., and is used safely in the situation where the interior of the bottle is decompressed. <P>SOLUTION: The synthetic resin round bottle includes a cylindrical trunk, and a mouth cylinder raised on the upper end of the trunk via the tapered shoulder shrinking upward in diameter. On the shoulder, a groove circumferential rib is formed circumferentially at a level where the shoulder has a diameter in a range of 70 to 98% of the diameter of the trunk. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a synthetic resin round casing having a cylindrical body.

  Conventionally, a synthetic resin casing represented by a biaxial stretch blow molded casing (pet bottle) made of polyethylene terephthalate (hereinafter referred to as PET) resin is known. And, for example, as a method for filling fruit juice beverages, tea bottles, etc. that require sterilization, there is a so-called high-temperature filling method, which fills the casing with the content liquid at a temperature around 90 ° C., The cap is sealed and then cooled, and after cooling, the inside of the casing is considerably decompressed.

  Therefore, for applications involving high-temperature filling as described above, a vacuum absorption panel is formed in the body, and the volume reduction deformation of the peripheral wall of the casing accompanying decompression gives the feeling that the casing is deformed in an irregular shape. In other words, so-called heat-resistant bottles that exhibit a function of absorbing (relaxing) so as not to stand out, that is, a so-called reduced-pressure absorbing function, are often used. (See Patent Document 1)

On the other hand, the casing 101 shown in FIG. 3 is a PET casing biaxially stretched blow molded round casing, but the casing 101 has a peripheral wall without forming a vacuum absorbing panel as described above. The wall thickness is relatively thick, and a large number of circumferential groove ribs 112 are provided around the cylindrical body portion 104 to increase the surface rigidity of the peripheral wall of the body portion 104, thereby suppressing depression deformation caused by decompression. ing.
JP 2003-63516 A

However, the housing 101 that does not employ the vacuum absorbing panel shown in FIG. 3 has insufficient surface rigidity of the peripheral wall of the shoulder portion 103 formed in a tapered cylindrical shape in an application where the pressure reduction degree is as high as −200 mmHG or higher. However, there is a problem that depression deformation occurs in the portion.
In addition, if the weight of the housing is reduced in terms of resource saving and material cost reduction, that is, the peripheral wall is made thinner, the problem of insufficient surface rigidity at the shoulder as described above becomes more serious. Since it causes troubles in storage and transportation in a heavy state and in a vending machine, it is required to improve surface rigidity by improving the shape of the shoulder.

Therefore, the present invention has an object to increase the surface rigidity of the peripheral wall of the tapered shoulder portion in the above-described synthetic resin round casing, and has a sufficient surface rigidity as a whole, and has a production line and a vending machine. It is an object of the present invention to provide a synthetic resin round casing that can be used safely in applications where there is no trouble in the above-mentioned manner, and in which the degree of decompression is high.

Among the means of the present invention for solving the above technical problem, the main configuration is:
In the synthetic resin round case with the mouth tube portion erected on the upper end of the cylindrical body portion through the tapered shoulder portion whose diameter is reduced upwards,
In the shoulder portion, the groove-shaped peripheral rib is provided in a height range having a diameter in the range of 70 to 98% of the diameter of the trunk portion.

  With the above configuration, by providing the groove-shaped peripheral rib in the shoulder in the height range having a diameter in the range of 70 to 98% of the diameter of the trunk portion, depression deformation in a high decompression state of about -200 mmHG, It is possible to effectively suppress deformation due to a pressing force acting in a production line or a vending machine.

  On the other hand, even if a groove-like circumferential rib is provided in a position that is less than 70% of the diameter of the body portion, that is, in a region substantially above the shoulder portion, deformation due to reduced pressure or pressing force generated in the lower region is effectively suppressed. In addition, if it is provided at a position exceeding 98%, that is, a portion immediately adjacent to the boundary between the lower end of the shoulder and the upper end of the trunk, the effect of increasing the surface rigidity of the entire shoulder by the grooved peripheral rib is impaired. End up.

  In another configuration of the present invention, in addition to the main configuration described above, the shape of the groove-shaped peripheral rib is a shape composed of a bottom wall and a pair of side walls, and the center of the trunk portion of the side wall located at the lower side of the pair of side walls. The opening angle with respect to the axial direction is 90 °.

In storage and transportation of products, a large number of cases are stacked, so that the buckling strength against the load from the vertical direction of the case (hereinafter sometimes simply referred to as buckling strength) is required. However, when the groove-shaped peripheral rib is provided around the shoulder portion as described above, generally, the groove-shaped peripheral rib becomes a starting point of deformation, and this buckling strength decreases.
Therefore, the above configuration is for suppressing the decrease in the buckling strength, and by setting the opening angle of the lower side wall to the central axis direction of the trunk portion to 90 °, the vertical buckling strength of the shoulder portion is set. Can be effectively suppressed.

  Still another configuration of the present invention is such that, in addition to the above configuration, the opening angle formed by the pair of side walls is in the range of 90 ° ± 30 °.

  If the opening angle between the pair of side walls is too large, the effect of increasing the surface rigidity is reduced, and if it is too small, the buckling strength is greatly reduced. With the above configuration, the opening angle of both side walls is 90 ° ± 30 °. By setting it as the range, it is possible to increase the surface rigidity of the shoulder while suppressing a decrease in the buckling strength to a certain extent.

  According to still another aspect of the present invention, a circumferential groove rib is provided around the upper body portion.

With the above configuration, a round housing with increased surface rigidity in the entire housing, combined with the effect of the groove-like circumferential rib provided around the shoulder, by providing circumferential groove ribs around the body. Can be provided.

Since the present invention has the above-described configuration, the following effects can be obtained.
That is, in the thing which has the main structure of this invention, -200mmHG is made by making the surrounding position of the groove-shaped peripheral rib in a shoulder part into the height range which has a diameter of 70 to 98% of the diameter of a trunk | drum. It is possible to effectively suppress depression deformation in a highly decompressed state and deformation due to a pressing force acting in a production line or a vending machine.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 and 2 show an embodiment of a round housing according to the present invention. FIG. 1 is an overall front view, and FIG. 2 is a longitudinal sectional view in the vicinity of a shoulder.
This casing 1 is a round casing made of biaxial stretch blow molding made of PET resin. A cylindrical body 2 is erected on the upper end of a cylindrical body 4 via a tapered shoulder 3, and a body is formed. The bottom part 5 has a bottom part 5 at the lower end. The overall height of the housing 1 is 156 mm, the diameter of the trunk is 64 mm, and the capacity is 415 ml.

  Five circumferential groove ribs 12 are formed on the peripheral wall of the cylindrical body portion 4 to increase the surface rigidity of the peripheral wall and to provide a vertical seat that is strong against a load from the vertical direction that acts when the content liquid is filled. The structure increases the flexural strength.

A groove-shaped peripheral rib 11 is provided around the tapered peripheral wall of the shoulder 3. FIG. 2 is an enlarged vertical cross-sectional view of the vicinity of the shoulder 3 of the housing 1 shown in FIG. 1, and is for explaining the arrangement of the groove-shaped peripheral ribs 11 on the shoulder 3.
In FIG. 2, h0, hb, ht and h1, h2 indicate height positions, respectively. The height position h0 is the upper end of the cylindrical body 4, and the diameter D0 of the body 4 is 64 mm. The diameter Db at the height position hb and the diameter Dt at the height position ht are 98% and 70% of the diameter D0, respectively.

And this groove-shaped peripheral rib 11 is comprised from the bottom wall 11b and a pair of side wall 11s, and the lower end and upper end of this groove-shaped peripheral rib 11 become the height range H between said height position hb and ht, respectively. I am doing so.
In this embodiment, the diameter of the peripheral wall of the shoulder 3 at the height positions h1 and h2 of the lower and upper ends of the groove-shaped peripheral ribs 11 is 94% and 86% of the diameter D0, respectively.

  Further, the lower side wall 11sb of the side walls 11s is formed in the horizontal direction, and the opening angle A with respect to the central axis Ax of the body portion 4 is 90 °. Further, the upper side wall 11st is formed in the vertical direction, and the opening angle B of the side walls 11sb and 11st is 90 °.

  Here, FIG. 3 is an overall front view of the above-described conventional round casing, which is a comparative example of the casing of the above embodiment. This casing 101 is a round bowl made of biaxial stretch blow molding made of PET resin having the same shape as the casing 1 shown in FIG. 1 except that there is no groove-shaped peripheral rib 11 formed on the peripheral wall of the shoulder 3. Is the body.

Next, the test which evaluates the surface rigidity of the shoulder parts 3 and 103 was implemented about the housing 1 of the Example of FIG. 1, and the housing 101 of the comparative example of FIG.
Here, FIG. 4 is a schematic explanatory view of this test method. As shown in this figure, after filling the content liquid, the mouth tube portion 2 is sealed with a cap, and the housing 1 is supported in an oblique posture. In this state, the tip of the shoulder 3 and the body 4 are pressed against the boundary region by a jig Jg having a spherical shape, and the surface rigidity of the shoulders of both housings is evaluated by the load immediately before the portion is deformed.
In addition, the said evaluation method considered the operation | movement aspect of the pressing force in the area | region where depression deformation generate | occur | produces in a decompression test, a manufacturing line, a vending machine, etc.

The test result of the surface rigidity by the above test method is 64N in the case 1 of the example, and 50N in the case 101 of the comparative example, and in the case 1 of the example, the formation of the groove-like peripheral rib 11 causes the shoulder 3 The surface rigidity could be increased by 28%.
And the improvement of the surface rigidity of such a shoulder part 3 enables the housing 1 of the present embodiment to effectively suppress the depression deformation in a reduced pressure state as high as about -200 mmHG, as well as the production line and the vending machine. The machine could be used without any trouble.
In addition, by appropriately setting the opening angles A and B related to the side wall 11s in the groove-shaped peripheral rib 11, it is possible to suppress a decrease in buckling strength with respect to a load in the vertical direction due to the formation of the groove-shaped peripheral rib 11. The storage and transportation in the stacked state could be made practically no problem.

As mentioned above, although embodiment of this invention was described along the Example, the effect of this invention is not limited to these Examples.
For example, the height position where the grooved circumferential rib is disposed, or the shape of the grooved circumferential rib, such as the opening angle of the groove, the inclination angle of the shoulder, the required surface rigidity and buckling strength. While considering balance and the like, it can be appropriately selected under the requirement of a height range having a diameter in the range of 70 to 98% of the diameter of the body portion.

The synthetic resin round casing of the present invention can be used safely in applications where high decompression occurs by providing groove-like peripheral ribs at appropriate positions on the shoulder, and can also be used in production lines and vending machines. Deformation due to the pressing force acting on can be effectively suppressed, and wide application development in the round bottle field is expected.

It is a whole front view which shows one Example of the round housing of this invention. It is a longitudinal cross-sectional view of the shoulder vicinity of the round housing shown in FIG. It is a whole front view which shows the prior art example (comparative example) of a round frame. It is a schematic explanatory drawing about the measuring method of the surface rigidity of a shoulder part.

Explanation of symbols

1; housing 2; mouth tube part 3; shoulder part 4; trunk part 5; bottom part 11; grooved peripheral rib 11b (of the shoulder part); bottom wall 11s (of grooved peripheral ribs) (11sb, 11st); Side wall 12 of groove-like circumferential rib; circumferential groove rib 101; housing 102; mouth tube portion 103; shoulder 104; trunk portion 105; bottom portion 112; (groove portion) circumferential groove ribs A and B; Central axis H; height ranges h0, hb, ht; height positions h1, h2; height positions D0, Db, Dt; diameter Jg;

Claims (4)

The upper end of the cylindrical body (4) is a casing in which a mouth tube part (2) is erected through a tapered shoulder part (3) whose diameter is reduced upward, and the shoulder part ( In 3), a synthetic resin round characterized in that groove-like peripheral ribs (11) are provided in a height range (H) having a diameter in the range of 70 to 98% of the diameter of the body (4). Shaped body. The shape of the groove-shaped peripheral rib (11) is a shape consisting of a bottom wall (11b) and a pair of side walls (11s), and the body portion (4) of the side wall (11sb) positioned below the pair of side walls (11s). 2) The synthetic resin round casing according to claim 1, wherein the opening angle (A) with respect to the central axis direction is 90 °. The synthetic resin round casing according to claim 2, wherein an opening angle (B) formed by the pair of side walls (11s) is in a range of 90 ° ± 30 °. The synthetic resin round casing according to claim 1, 2, or 3, wherein a circumferential groove rib (12) is provided around the body (4).

Images