JP2011230821A - Synthetic resin round bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin round bottle for storing frozen liquid that prevents deformation when the liquid is completely frozen especially at the neck and shoulder part thereof, and ensures safe storage and use, with good appearance.SOLUTION: The synthetic resin round bottle 1 includes a cylindrical opening cylinder part 2, a tapered cylindrical shoulder part 3, a cylindrical body part 4, and a bottom part 5. In the peripheral wall of the shoulder part, a plurality of grooved recesses 16 are formed to be concave in parallel to one another along the peripheral direction. At the lower part of each grooved recess, the lateral width of the grooved recess is tapered toward the lower end. Shoulder column portions 17 are formed between the adjacent grooved recesses.

Description

The present invention relates to a synthetic resin casing, and more particularly to a synthetic resin round casing that is used by freezing a content liquid mainly composed of water.

Synthetic resin casings such as polyethylene terephthalate (hereinafter referred to as PET) resin are widely used for beverages such as water, sports drinking water, tea and juice. They are also being used for drinking, etc. while gradually unpacking the ones in the fresh state. For example, Patent Document 1 has a description of a casing in which such a content liquid is frozen.

Japanese Patent Laying-Open No. 2005-187053

  When water is frozen, its volume is approximately 1.09 times. Therefore, in a case sealed with a cap, the internal pressure may increase due to the increase in volume accompanying freezing, and the case may be damaged. Even if not, the housing will bulge and deform, resulting in poor appearance and anxiety to the user. In addition, wrinkles may be generated on the shrink film that is packaged, or it may be broken.

  The volume increase caused by freezing can be dealt with to some extent by taking a large head space on the filled liquid surface, but the diameter of the body from the neck to the shoulder is still the diameter. Since it is thin, it completely freezes ahead of other parts, and the headspace is sealed (hereinafter, the frozen part is referred to as a freezing plug part), and the headspace is used for freezing. Therefore, there is a problem in that the increase in volume accompanying the above cannot be absorbed, and the peripheral wall of the body portion expands and deforms beyond an allowable range.

The present invention solves the above-described problems in the case where the contents liquid is used after being frozen, particularly the problem of deformation of the case due to complete freezing of the part from the neck to the shoulder of the case. An object of the present invention is to provide a synthetic resin round housing that can be safely stored and used even when frozen and has no problem in appearance.

Among the means for solving the above technical problems, the main means of the present invention is as follows.
In a synthetic resin round housing having a cylindrical mouth tube, a tapered tube shoulder, a cylindrical body, and a bottom,
On the peripheral wall of the shoulder, a plurality of groove-shaped recesses are recessed in parallel along the circumferential direction,
In the lower region of the groove-shaped recess, the width of the groove-shaped recess is narrowed toward the lower end,
The shoulder column part remains between adjacent groove-shaped recesses,
It is said.

Filled with a liquid containing water as the main component, leaving a predetermined amount of head space, and cooled with a freezer etc. in a state sealed with a cap, the part from the neck to the shoulder of the housing precedes the other parts. It completely freezes to form a freezing stopper.
When further freezing progresses in the body portion, a force that pushes the freezing stopper portion upward due to the increase in volume (hereinafter, sometimes referred to as push-up force) acts.

Therefore, according to the main configuration, the above-described push-up force acts on the bottom of the groove-shaped recess, and the groove-shaped recess expands and deforms in a bulging shape toward the outside of the housing. Force (hereinafter, may be referred to as a diameter expansion force) acts.
As the groove-shaped recess is expanded in diameter, the shoulder column portion remaining between adjacent groove-shaped recesses protrudes and displaces outward.
As a result, the close contact between the inner peripheral surface of the shoulder column portion and the outer peripheral surface of the cryoplug portion is eliminated, a gap is formed, the sealing action by the freeze stopper portion is eliminated, and the inside of the trunk portion communicates with the head space. It will be in the state.

  By this communication, the increase in volume due to the progress of freezing in the body portion can be absorbed using the head space, and the capacity of the shoulder portion is increased due to the bulge-like diameter expansion deformation of the groove-like recess. Combined with the effect, it is possible to effectively suppress the bulging deformation of the body part due to freezing.

  Here, in the lower region of the groove-shaped recess, the lateral width is narrowed toward the lower end, so that the amount of diameter-expanding deformation of the groove-shaped recess in the upper position is larger in the lower region than in the lower region. Accordingly, the shoulder column portion is greatly protruded and displaced outwardly at the upper position compared to the lower position, so that the communication between the inside of the trunk portion and the head space can be reliably achieved.

In the lower part of the groove-like recess, within the category of narrowing the width of the groove-like recess toward the lower end, the number and shape of the groove-like recesses are not particularly limited, and the appearance, Although it can be set appropriately considering the absorption effect of volume increase, etc.,
The number of arrangement is usually preferably in the range of 3-8.
In addition, the body part may be a simple cylindrical shape, or a body having a reduced pressure absorption panel disposed on the peripheral wall of the body part to exhibit a reduced pressure absorption function, or to enhance rigidity and buckling strength. A large number of circumferential grooves may be provided.

  According to another configuration of the present invention, in the main configuration described above, the direction in which the groove-shaped recess is disposed when the shoulder portion is seen in a plan view is the direction in which the bottom of the groove-shaped recess extends in the radial direction. Is.

  According to the groove-shaped recess having the above configuration, as the freezing progresses, the push-up force acting on the freezing plug portion can be effectively dispersed in the direction in which the groove-shaped recess expands, thereby forming a gap in the shoulder column portion. Can proceed more smoothly.

  Still another configuration of the present invention is such that, in the main configuration described above, the groove-shaped recess is disposed in a direction in which the shoulder portion is viewed in plan view, and the bottom of the groove-shaped recess is inclined with respect to the radial direction. The direction.

According to the groove-shaped recess having the above-described configuration, by arranging the groove-shaped recess in an inclined shape, not only the direction in which the groove-shaped recess increases the diameter of the pushing-up force acting on the freezing plug portion as the freezing progresses. In addition, it is possible to disperse in the vertical direction, so that an increase in capacity due to the vertical extension of the shoulder can be expected.

The present invention has the above-described configuration, and has the following effects.
In the synthetic resin round casing having the main structure of the present invention, the push-up force acts on the bottom of the groove-like recess, and the groove-like recess is expanded and deformed in a bulging shape. As a result, the shoulder column protrudes and displaces toward the outside of the housing. As a result, the close contact between the inner peripheral surface of the shoulder column and the outer peripheral surface of the freezing plug portion is eliminated, and a gap is formed. The sealing action is eliminated, and the inside of the trunk is in a state of communicating with the head space.
By this communication, the volume increase due to the progress of freezing in the body portion can be absorbed using the head space, and the effect of increasing the capacity of the shoulder portion due to the bulging deformation of the groove-like recess is also considered. Thus, it is possible to effectively suppress the bulging deformation of the body portion due to freezing.

It is a front view which shows 1st Example of the housing of this invention. It is a top view of the housing of FIG. It is a plane sectional view shown along the A1-A1 line in FIG. It is a longitudinal cross-sectional view of the surrounding wall of the shoulder part vicinity shown along the BB line in FIG. It is a plane sectional view which illustrates roughly the deformation | transformation aspect of the surrounding wall of the shoulder part at the time of freezing. It is a front view which shows 2nd Example of the housing of this invention. FIG. 7 is a plan sectional view of the housing of FIG. 6. It is a front view which shows the housing of a comparative example.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below along the examples with reference to the drawings.
1 to 5 are diagrams for explaining a first embodiment of the synthetic resin round casing of the present invention. FIG. 1 is a front view, FIG. 2 is a plan view, and FIG. 4 is a plan sectional view taken along line A1, FIG. 4 is a longitudinal sectional view of the peripheral wall in the vicinity of the shoulder shown along line BB in FIG. 1, and FIG. 5 shows a deformation mode of the peripheral wall of the shoulder during freezing. It is a plane sectional view explaining roughly.

This casing 1 is a PET bottle having a common capacity of 500 ml of biaxial stretch blow molding, and has a cylindrical mouth tube part 2, a neck part 2n, a tapered cylindrical shoulder part 3, a cylindrical body part 4 and a bottom part. 5 On the peripheral wall of the trunk portion 4, six vertically-long rectangular absorption panels 12 are arranged in parallel in the circumferential direction so as to be surrounded by the step portion 11, and between the adjacent vacuum absorption panels 12. The column portion 13 that bears the rigidity and buckling strength of the housing 1 is left.
In addition, circumferential grooves 6 a, 6 b, and 6 c are disposed above and below the vacuum absorbing panel 12.

The shape of the shoulder 3 is a tapered cylinder as a whole, but the degree of inclination changes at the height position of the A1-A1 line in FIG. 1, and when viewed from the front, the impression is slightly angular as seen in FIG. Is given.
Six groove-like recesses 16 are formed in the peripheral wall of the shoulder 3 in parallel with each other at equal central angular positions along the circumferential direction, and a shoulder column 17 is formed between the adjacent groove-like recesses 16. Residual formed. The shape of the groove-like recess 16 is symmetric as seen in FIG. 1 or FIG. 2, and its horizontal width is the maximum near the height position of the A1-A1 line in FIG. 1, and it shrinks upward and downward. It is wide and has a rhombus shape as a whole. And the bottom part 16b of the groove-shaped recessed part 16 shown with the dashed-dotted line in the groove-shaped recessed part 16 in FIG. 1, 2 is extended in the radial direction so that the top view of FIG.

Next, FIG. 8 shows a case 31 of a comparative example having the same shape as that of the case 1 of the first embodiment shown in FIG. 1 except that the groove-shaped recess 16 is not formed in the shoulder 3. It is a front view.
And about the housing 1 of 1st Example and the housing 31 of the said comparative example, it filled with the water of 20 degreeC to the height of the liquid level Ls in FIG.1, 8, (it shows with HS in FIG.1,8). The area is the headspace.) Sealed with a cap and placed in a freezer in an upright state to freeze the water inside, and conducted a freezing test to observe the progress of freezing and deformation of the housing did.

As a result of the above freezing test, in the case 31 of the comparative example, first, freezing proceeds over the entire plane cross section in the vicinity of the region indicated by the cross hatch in FIG. Fp was formed, and the head space Hs was sealed.
For this reason, after that, when freezing mainly proceeds in the body part 4, the head space HS existing above the freezing plug part Fp cannot be used to absorb the volume increase in the body part 4, The decompression absorption panel 12 of the trunk portion 4 was deformed into a bulging shape, and the trunk portion 4 was bulged and deformed into a via barrel shape as a whole.

  On the other hand, in the case 1 of the first embodiment, like the case 31 of the comparative example, first, freezing proceeds over the entire plane cross section in the vicinity of the region indicated by the cross hatch in FIG. However, when freezing proceeds in the range from the shoulder portion 3 to the body portion 4, the shoulder column portion will be described later by the action of the groove-shaped recess 16 disposed on the peripheral wall of the shoulder portion 3. The close contact between the inner peripheral surface of 17 and the outer peripheral surface of the freezing plug portion Fp is eliminated, so that a gap S is formed (see FIG. 5). The head space Hs communicates with the head space Hs and, due to the effect of increasing the capacity of the shoulder portion 3 due to the bulging deformation of the groove-like recess 16, due to the progress of freezing in the body portion 4. The volume increase can be absorbed, and the deformation of the body 4 due to freezing can be effectively suppressed. It could be.

Here, FIG. 5 is a plan sectional view for schematically explaining a deformation mode of the peripheral wall at the time of freezing. In the drawing, a sectional shape along the lines A1-A1 and A2-A2 lines in FIG. LA2 is shown superimposed. Moreover, the freezing stopper part Fp is represented by a cross hatch, and the deformation | transformation aspect of cross-sectional shape LA1 is partially shown with the dashed-two dotted line.
The A1-A1 line is the position where the lateral width of the groove-shaped recess 16 is maximized, and the A2-A2 line is positioned lower than the A1-A1 line, and the lateral width is narrower. On the other hand, the lateral width of the shoulder post 17 is wider at the A2-A2 line position than the A1-A1 line.

Next, with reference to FIG. 5 and FIG. 4 described above, a mechanism for eliminating the sealing action by the freeze stopper portion Fp will be schematically described.
After the head space Hs is sealed by the freezing plug portion Fp, when the freezing of the content liquid proceeds in the body portion 4, a push-up force acts on the freezing plug portion Fp due to the increase in volume in the body portion 4 (FIG. 4). The push-up force acts on the bottom portion 16b of the groove-shaped recess 16 (in the direction of the white arrow in FIG. 4), and a force that pushes the bottom portion 16b outward acts.

Then, when a force acts in the direction of the white arrow in FIG. 4, when viewed in the cross-sectional shape LA1 in FIG. 5, the force acts on the groove-shaped recess 16 in the direction indicated by the arrow in the figure, and as a result, The groove-like concave portion 16 is deformed in a bulging state, and is in a state where the diameter is increased and deformed as indicated by a two-dot chain line in the drawing.
As the groove-shaped recess 16 is expanded in diameter, the shoulder column portion 17 is greatly protruded and displaced, and the close contact between the inner peripheral surface of the shoulder column portion 17 and the outer peripheral surface of the freezing plug portion Fp is eliminated. Thus, the gap S is formed, and the sealing action by the freezing plug portion Fp is eliminated.
In addition, a slight gap S is formed between the groove-shaped recess 16 and the outer peripheral surface of the freezing plug portion Fp.

Here, the same deformation occurs in the cross-sectional shape LA2, but since the lateral width of the groove-shaped recess 16 is narrow at the position of the line A2-A2, the diameter-expanded deformation of the groove-shaped recess 16 becomes relatively small, and as a result, the shoulder 17 The amount of protrusion displacement of becomes smaller.
In this way, the amount of protrusion displacement of the shoulder portion 17 in the upper A1-A1 line is made larger than the position of the lower A2-A2 line, thereby reliably achieving communication between the inside of the trunk portion 4 and the head space Hs. be able to.

Next, FIGS. 6 and 7 show a second embodiment of the synthetic resin round casing of the present invention, FIG. 6 is a front view, and FIG. 7 is a plan view.
The casing 1 of the second embodiment has the same shape as the casing 1 of the first embodiment shown in FIG. 1 except that the shape of the groove-like recess 16 formed on the peripheral wall of the shoulder 3 is different. Is.
The shape of the groove-like recess 16 is characterized in that the extension direction, that is, the extension direction of the bottom portion 16b is set in the plane of FIG. As shown in the figure, it is at a point inclined with respect to the radial direction. Thus, by forming the groove-like recess 16 obliquely, the pressing force described in FIG. Not only the diameter-expanding direction but also the vertical direction can be dispersed, whereby the capacity of the shoulder 3 can be increased by the longitudinal extension of the shoulder 3.

As mentioned above, although embodiment of this invention and its effect were demonstrated along the Example, this invention is not limited to this Example.
For example, the capacity of the housing is not limited to 500 ml as in the above embodiment, and a smaller or larger housing can be used. Moreover, although the example which has arrange | positioned the decompression absorption panel in the trunk | drum was shown in the said Example, it can also be set as the simple cylindrical form and the cylindrical form which arrange | positioned many peripheral ribs.

In addition, the shape of the groove-like recesses and the number of the groove-like recesses are arranged such that the width is narrowed toward the lower end in the lower part, and the appearance and the effect of eliminating the sealing action of the freezing stopper part, and further, the groove-like recesses are expanded. It can be set as appropriate in consideration of the effect of increasing the capacity due to deformation.

As described above, the synthetic resin round casing of the present invention can absorb the increase in volume due to freezing of the content liquid by making full use of the head space, and is mainly composed of water. A wider range of uses is expected in the field of freezing and using liquids.

DESCRIPTION OF SYMBOLS 1; Housing 2; Mouth part 3; Shoulder part 4; Trunk part 5; Bottom part 6a, 6b, 6c; Circumferential groove 11; Step part 12; Depressurization absorption panel 13; Column part 16: Groove-shaped recessed part 16b; ; Shoulder column part 31; housing Fp; freezing stopper part Hs; head space Ls; liquid level S; gap

Claims (3)

In a round housing having a cylindrical mouth tube (2), a tapered tube shoulder (3), a cylindrical body (4), and a bottom (5), the peripheral wall of the shoulder (3) In addition, a plurality of groove-shaped recesses (16) are recessed and formed in parallel along the circumferential direction, and the lateral width of the groove-shaped recess (16) is narrowed toward the lower end in the lower region of the groove-shaped recess (16). A synthetic resin round casing comprising a shoulder pillar portion (17) remaining between adjacent groove-shaped recess portions (16). The groove-shaped recess (16) is disposed in a direction in which the shoulder (3) is seen in plan view, and the bottom (16b) of the groove-shaped recess (16) extends in the radial direction. Synthetic resin round frame. The direction of disposition of the groove-like recess (16) when the shoulder (3) is viewed in plan view is the direction in which the bottom (16b) of the groove-like recess (16) is inclined and extended with respect to the radial direction. The synthetic resin round casing according to claim 1.

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