JP5090776B2 - Flat bottle-shaped positive pressure container - Google Patents

Description

  The present invention is a flat-shaped bottle-shaped positive pressure container formed with a carbonated beverage or the like formed in a flat shape, and even if the inside of the container becomes a positive pressure after filling and sealing the contents, The present invention relates to a flat bottle-shaped positive pressure container in which a remarkable shape change is suppressed.

Conventionally, a synthetic resin container formed by molding a synthetic resin such as polyethylene terephthalate into a bottle shape by blow molding or the like is known as a beverage container containing various beverage products. In this type of beverage container, when a positive pressure beverage such as a carbonated beverage is used as the contents, the pressure in the container after filling and sealing the contents is increased. It is required to suppress changes in the shape of the container due to the rise. For this reason, for example, Patent Document 1 proposes a plastic container in which the shape of the bottom is devised so that the self-supporting stability is not impaired even when the internal pressure increases.
JP-A-8-318922

  By the way, in a bottle-shaped positive pressure container filled and sealed with positive pressure contents, the pressure inside the raised container is evenly distributed so that the shape does not change significantly unevenly. In order to do this, the container shape is usually cylindrical.

However, it has been pointed out that the bottle-shaped containers formed in a cylindrical shape are poor in space efficiency when they are arranged on a display shelf at the time of sale at a store. In order to make effective use of the store display space, for example, it is possible to make the container shape flat by making the cross-sectional shape of the container elliptical, but in this way, the contents are filled. -When the container is sealed and a positive pressure is generated in the container, the container tends to swell greatly in the minor axis direction in an attempt to deform so that the cross-sectional shape is circular.
For this reason, not only can the flat shape be maintained by simply flattening the container shape, but also the commercial value may be impaired if it is significant.

  In addition, in patent document 1, although the trunk | drum is made into the cylindrical shape body of a cross-sectional ellipse shape, it started from suppressing the non-uniform shape change of a bottom part, and about the non-uniform shape change which swells to a short-axis direction. Is not considered at all.

  The present invention has been made in view of the above circumstances, and even when a bottle-shaped positive pressure container containing carbonated beverages or the like is formed flat, the contents are filled and sealed so that the inside of the container is positive pressure. It is an object of the present invention to provide a flat bottle-shaped positive pressure container that can be prevented from greatly expanding in the minor axis direction.

A flat bottle-shaped positive pressure container according to the present invention that solves the above problems comprises a mouth portion, a shoulder portion, a trunk portion, and a bottom portion, and the trunk portion has an elliptical cross section perpendicular to the height direction. The upper body portion and the lower body portion are arranged so that the major axes in the transverse section are substantially parallel to each other, and the upper body portion and the lower body portion The maximum length D2 along the direction parallel to the long axis in the cross section of the upper trunk portion or the lower trunk portion is set to the upper portion at the most narrowed portion. It is shorter than the maximum length D3 along the direction parallel to the minor axis in the transverse section of the trunk or the lower trunk, and the ratio D2 / D3 is set to 0.5 to 0.95. In this configuration, the aperture portion is formed.

  The flat bottle container according to the present invention having such a configuration is such that a positive pressure content such as a carbonated beverage is filled and sealed, and even if the inside of the container becomes a positive pressure, the flat bottle container greatly expands in the short axis direction. By suppressing, a flat shape can be maintained without causing a remarkably uneven shape change.

In the flat bottle-shaped positive pressure container according to the present invention, the length D2 is shorter than the length D3, and the ratio D2 / D3 is 0.5 to 0.95. It is possible to positively deform the portion to cancel the force that causes the upper body portion and the lower body portion to swell, and to more effectively suppress the deformation of the upper body portion and the lower body portion.

Further, in the flat bottle-shaped positive pressure container according to the present invention, the maximum length along the direction parallel to the minor axis in each transverse section is substantially constant between the upper body part and the lower body part. As it is, the narrowed portion is formed so that the maximum length along the direction parallel to the major axis in each transverse section is shortened, and the narrowed portion is formed.
By doing in this way, the flat area which continues in a height direction is ensured in the front of a container, and adjacent containers can be contacted by this flat area, and can be arranged stably.

  In addition, the flat bottle-shaped positive pressure container according to the present invention has the upper body portion in consideration of an increase in volume obtained by forming a flat shape, blow moldability, and easy alignment during transportation. And it is preferable that the flatness of the said lower trunk | drum is 1.2-2.0.

  In addition, the flat bottle-shaped positive pressure container according to the present invention has a sufficient squeezing ratio of the throttle part, that is, the upper trunk part or the lower trunk part, in order to obtain a sufficient effect by forming the throttle part. It is preferable that the ratio D2 / D1 between the major axis length D1 and the length D2 in the cross section is 0.25 to 0.85.

  In addition, the flat bottle-shaped positive pressure container according to the present invention forms a throttle part by narrowing between the upper trunk part and the lower trunk part in order to suppress deformation of the upper trunk part and the lower trunk part more effectively. In doing so, it is preferable that the most narrowed portion of the throttle portion is disposed at a position spaced from the ground contact surface of the bottom portion at a height that is ¼ to ¾ of the height of the container.

  As described above, the flat bottle-shaped positive pressure container according to the present invention causes a remarkably non-uniform shape change by suppressing a large bulge in the minor axis direction even when the inside of the container becomes a positive pressure. The flat shape can be maintained without any problems.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view showing a reference example of a flat bottle-shaped positive pressure container according to the present embodiment, FIG. 1 (a) is a plan view, FIG. 1 (b) is a front view, and FIG. 1 (c) is a side view. FIG. Moreover, FIG. 2 is explanatory drawing which shows an example of the flat bottle-shaped positive pressure container which concerns on this embodiment, FIG.2 (a) is a top view, FIG.2 (b) is a front view, FIG.2 (c) is FIG. It is a side view.

  A container 1 shown in these drawings includes a mouth portion 2, a shoulder portion 3, a trunk portion 4, and a bottom portion 5. A lid (not shown) is attached to the mouth portion 2. The shoulder portion 3 located between the mouth portion 2 and the trunk portion 4 is formed so as to be squeezed from the upper end of the trunk portion 4 and to be continuous with the mouth portion 2.

  In the present embodiment, the body part 4 has an upper body part 41 and a lower body part 42 in which a cross section perpendicular to the height direction (hereinafter simply referred to as “cross section”) is elliptical. . And the upper trunk | drum 41 and the lower trunk | drum 42 are arrange | positioned so that each long axis in a cross section may become substantially parallel, Between the upper trunk | drum 41 and the lower trunk | drum 42, the said site | part A narrowing portion 43 is formed by narrowing down.

Here, the height direction means a direction along a direction orthogonal to the horizontal plane when the container 1 is placed on the horizontal plane with the mouth portion 2 facing up.
In addition, each of the upper and lower body portions 41 and 42 is formed so as to have an elliptical cross section, but strictness in the mathematical sense as an ellipse is not required. In an arbitrary cross section, a portion where the length of a line segment connecting two points on the circumference facing each other through the center of the container 1 is the longest axis is referred to as a long axis, and in the cross section including the long axis, the container 1 The part where the length of the line segment connecting the two points on the circumference facing each other through the center is the shortest axis.

In the reference example shown in FIG. 1, the narrowed portion 43 formed between the upper body portion 41 and the lower body portion 42 has a long axis of the upper body portion 41 or the lower body portion 42 at the most narrowed portion. When the maximum length along the parallel direction is D2, and the maximum length along the direction parallel to the short axis of the upper body 41 or the lower body 42 is D3, the ratio D2 / D3 is 0. It is formed by narrowing between the upper body part 41 and the lower body part 42 so that it may become 0.5-1.0.

  By doing in this way, the throttle part 43 connected to both the upper and lower body parts 41 and 42 resists the force that the upper and lower body parts 41 and 42 tend to swell in the minor axis direction due to the pressure increase in the container 1, It functions to maintain the shape of the container 1.

  For example, in the example shown in FIG. 1, the ratio D2 / D3 = 1 is set, and the throttle portion 43 is formed so that the cross-section of the most narrowed portion is almost a perfect circle. The shape is the least prone to uneven deformation. For this reason, if the upper and lower body parts 41, 42 are to be deformed so as to swell in the short axis direction, a force is applied to the throttle part 43 so as to swell in the same direction and to deform into an elliptical shape. The diaphragm 43 suppresses deformation of the upper and lower body parts 41 and 42 in an attempt to maintain a perfect circular shape against this.

In the present embodiment, as in the example shown in FIG. 2, the ratio D2 / D3 <1, and along the direction parallel to the major axis of the upper and lower body portions 41 and 42 at the most narrowed portion of the throttle portion 43. The maximum length D2 is made shorter than the maximum length D3 along the direction parallel to the short axis of the upper and lower body portions 41,. For this reason, in the most narrowed part of the throttle part 43, the directions of the major axis and the minor axis in the cross section are staggered from the directions of the major axis and the minor axis of the upper and lower body parts 41 and 42, respectively. Yes.
By doing so, the throttle portion 43 is deformed so as to swell in the left-right direction indicated by the chain line arrow in FIG. The heading force acts to cancel the force that deforms the upper and lower body parts 41 and 42 so as to swell in the minor axis direction, thereby suppressing the deformation of the upper and lower body parts 41 and 42.

In the reference example shown in FIG. 1, the throttle portion 43 is formed so as to be less likely to be biased and the upper and lower body portions 41 and 42 are prevented from being deformed . As shown in the example , the throttle portion 43 is positively deformed in a biased manner so as to cancel out the force that the upper and lower body portions 41 and 42 are to deform. In order to suppress the deformation of the upper and lower body parts 41 and 42, as in the example shown in FIG. 2, the restricting part 43 is positively deformed to cancel the force that causes the upper and lower body parts 41 and 42 to swell. preferably, in the present embodiment, the 0.5 to 0.95 the ratio D2 / D3, and more preferably from 0.65 to 0.85.

If less than the above range, the length along the direction parallel to the major axis of the upper and lower body portions 41, 42 of the throttle portion 43 becomes too short, it is not possible to ensure an appropriate stretch ratio during biaxial stretch blow molding, There is a risk of forming defects. Moreover, when the unstretched part of material increases, there also exists a malfunction that the container 1 will be easily damaged at the time of internal pressure load.
On the other hand, if the above range is exceeded, it becomes difficult to obtain the effect of positively deforming the aperture 43.

  In this way, when the narrowed portion 43 is formed by narrowing the space between the upper barrel portion 41 and the lower barrel portion 42, the maximum length along the direction parallel to the short axis of the upper and lower barrel portions 41, 42 is set. The throttle part 43 is formed by narrowing the body part 4 so that the maximum length along the direction parallel to the major axis of the upper and lower body parts 41 and 42 is shortened while being substantially constant. It is preferable to do this.

  By doing in this way, as shown in FIG.1 (c) and FIG.2 (c), the flat area | region continuous in a height direction can be ensured in the front of the container 1. FIG. By doing in this way, when many containers 1 are aligned, the adjacent containers 1 can be brought into contact with each other by this flat region, and can be stably aligned.

  Further, when narrowing the space between the upper body portion 41 and the lower body portion 42, the drawing ratio, that is, the length (major diameter) D1 of the major axis of the upper and lower body portions 41 and 42 and the most narrowed portion of the restriction portion 43 are narrowed down. The ratio D2 / D1 with respect to the maximum length D2 along the direction parallel to the major axis of the upper and lower body portions 41, 42 is preferably 0.25 to 0.85.

If less than the above range, the length along the direction parallel to the major axis of the upper and lower body portions 41, 42 of the throttle portion 43 becomes too short, it is not possible to ensure an appropriate stretch ratio during biaxial stretch blow molding, There is a risk of forming defects. Moreover, when the unstretched part of material increases, there also exists a malfunction that the container 1 will be easily damaged at the time of internal pressure load.
On the other hand, if the above range is exceeded, there is a tendency that the effect of forming the throttle portion 43 cannot be sufficiently obtained.

  Further, in order to more effectively suppress the deformation of the upper and lower body parts 41, 42, when forming the throttle part 43 by narrowing the space between the upper body part 41 and the lower body part 42, the throttle part 43 is the most The portion h that has been narrowed down is a height h that is ¼ to ¾ of the height H of the container 1 from the grounding surface 5a of the bottom 5, that is, the surface that contacts the ground when the container 1 is placed upright. It is preferable to form so as to be disposed at a position separated from each other, and more preferably, the most narrowed portion is disposed at substantially the center of the body portion 4 in the height direction.

Further, the flatness ratio of the upper body portion 41 and the lower body portion 42 having an elliptical cross section can be set as appropriate according to the capacity of the container 1 and the height H. Considering the increase in volume obtained, blow moldability, etc., it is preferably 1.2 to 2.0, more preferably 1.3 to 1.4.
The flatness of the upper body portion 41 and the lower body portion 42 is D1 / D3 when the maximum length (major axis) in the major axis direction is D1 and the maximum length (minor axis) in the minor axis direction is D3. It shall mean the value obtained more.

If it is less than the above range, an increase in the volume obtained by making a flat bottle is not expected, and the appearance is the same as that of a conventional cylindrical bottle, so that the features as a flat bottle are significantly impaired. In addition, since the cross-sectional shape is a shape close to a perfect circle, the cross-sectional shape rotates at the time of conveyance, and it is difficult to align in a certain direction.
On the other hand, when the above range is exceeded, there is a tendency that the shape change in the minor axis direction cannot be suppressed. Moreover, there also exists a malfunction that the container 1 will fall easily in the front direction.

The container 1 in the present embodiment as described above has a predetermined shape by, for example, biaxially stretching blow-molding a bottomed cylindrical preform made of a thermoplastic resin manufactured by known injection molding or extrusion molding. Can be molded.
As the thermoplastic resin, any resin can be used as long as stretch blow molding is possible. Specifically, thermoplastic polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyarylate, polylactic acid or copolymers thereof, those blended with these resins or other resins are suitable. It is. In particular, an ethylene terephthalate thermoplastic polyester such as polyethylene terephthalate is preferably used. Further, acrylonitrile resin, polypropylene, propylene-ethylene copolymer, polyethylene and the like can be used.

  Next, the present invention will be described in more detail with reference to specific examples.

[ Reference Example 1 ]
A preform made of polyethylene terephthalate (PET) was heated to about 100 ° C. above its glass transition point (Tg) and set in a mold heated to about 60 ° C. Next, while the preform was stretched with a stretch rod, blow air was supplied at a pressure of about 4 MPa to perform biaxial stretch blow molding to obtain a container 1 having a shape as shown in FIG.

When the dimension of the obtained container 1 was measured, the major axis D1 of the upper trunk | drum 41 was 96 mm, the minor axis D3 was 69 mm, and flatness D1 / D3 was 1.39. In the lower trunk portion 42, the major axis D1 was 96 mm, the minor axis D3 was 69 mm, and the flatness ratio D1 / D3 was 1.39. Further, the flatness ratio D2 / D3 was 1.0 at the most narrowed portion of the narrowed portion 43.
The height H of the container 1 was 220 mm, the full volume was 760 ml, and the average wall thickness of the body 4 was about 0.5 mm.

Such a container 1 was filled with carbonated water. At this time, the liquid temperature and carbon dioxide pressure conditions were adjusted so that the carbon dioxide pressure at a liquid temperature of 22 ° C. was 0.35 MPa. Then, it stored for 7 days under constant temperature of 38 degreeC, and when the flatness of the upper and lower trunk | drum 41,42 and the aperture | diaphragm | squeeze part 43 was measured, it became the result shown in Table 1.
The head space immediately after filling was 40 ml. Table 1 also shows the flatness of the upper and lower body parts 41 and 42 and the throttle part 43 before filling and immediately after filling.

  On the numerical value, after filling with carbonated water, the upper and lower body molds 41 and 42 swell in the minor axis direction, and after storage, the degree of swell is further increased, but no apparent shape change is observed. It was.

[ Example 1 ]
In the same manner as in Reference Example 1 , a container 1 having a shape as shown in FIG. 2 was obtained.
When the dimension of the obtained container 1 was measured, the major axis D1 of the upper trunk | drum 41 was 96 mm, the minor axis D3 was 69 mm, and flatness D1 / D3 was 1.39. In the lower trunk portion 42, the major axis D1 was 96 mm, the minor axis D3 was 69 mm, and the flatness ratio D1 / D3 was 1.39. Further, in the most narrowed portion of the narrowed portion 43, the flatness ratio D2 / D3 was 0.77, and the short diameter D2 was 53 mm.
The height H of the container 1 was 220 mm, the full volume was 710 ml, and the average thickness of the body 4 was about 0.5 mm.

Such a container 1 was filled with carbonated water in the same manner as in Reference Example 1 and stored for 7 days at a constant temperature of 38 ° C., and then the flatness of the upper and lower body parts 41 and 42 and the throttle part 43 was measured. The results shown in Table 2 were obtained.
The head space immediately after filling was 40 ml. Table 2 also shows the flatness ratios of the upper and lower body portions 41 and 42 and the throttle portion 43 immediately before filling and immediately after filling.

Similar to Reference Example 1 , no apparent shape change was observed. In addition, it was confirmed numerically that the upper and lower body molds 41 and 42 swell less than the reference example 1 .

[Comparative Example 1]
Except having no throttle portion 43 into the body portion a central portion in the same manner as Reference Example 1, the major diameter D1 of the body portion 4 is 96 mm, minor diameter D3 is a 69 mm, the oblateness D1 / D3 1.39 The container was molded.
That is, the major axis D1 of the part corresponding to each of the upper and lower body parts 41, 42 is 96 mm, the minor diameter D3 is 69 mm, the flatness ratio D1 / D3 is 1.39, and the part corresponding to the throttle part 43 (body The center part) was not narrowed down, and D2 = D1, and the flatness ratio D2 / D3 of the part was also 1.39.
Moreover, the height H of the container 1 was 220 mm, the full volume was 850 ml, and the average thickness of the trunk | drum 4 was about 0.5 mm.

Such a container 1 was filled with carbonated water in the same manner as in Reference Example 1 and stored for 7 days at a constant temperature of 38 ° C., and then the flatness of the upper and lower body parts 41 and 42 and the throttle part 43 was measured. The results shown in Table 3 were obtained.
The head space immediately after filling was 40 ml. Table 3 also shows the flatness ratios of the portions corresponding to the upper and lower body portions 41 and 42 before filling and immediately after filling, and the portion corresponding to the throttle portion 43.

  When the shape of the container 1 after storage was observed, the entire container swelled greatly in the minor axis direction, and in particular, the central part of the trunk was significantly deformed.

  Although the present invention has been described with reference to the preferred embodiment, it is needless to say that the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. .

  For example, as described above, when each of the upper and lower body portions 41 and 42 is formed into an elliptical cross section, the strictness in the mathematical sense as an ellipse is not required, so that the four corners of the rectangle are notched in an arc shape. The flat shape is also included in the oval shape.

In addition, the short diameter D3 of the upper body portion 41 and the lower body portion 42 is preferably substantially equal, but the long diameter D1 may be slightly different.
Further, there may be a plurality of apertures 43. In this case, the present invention may be applied with the part connected to the upper side in the height direction of each throttle part 43 as the upper body 41 and the part connected to the lower side as the lower body 42.

In the above-described embodiment, the throttle portion 43 is formed so that the maximum length along the direction parallel to the short axis of the upper and lower body portions 41 and 42 is substantially constant, but the maximum length also changes. An aperture 43 may be formed in the bottom.
For example, as shown in FIG. 3, the throttle part 43 may be formed so that the maximum length is also shortened, and the throttle part 43 may be constricted over the entire circumference. Further, as shown in FIG. 4, the throttle portion 43 is formed so that the maximum length of the throttle portion 43 is longer than the short diameter of the upper and lower body portions 41 and 42, and the container 1 is viewed from the side. In some cases, the throttle portion 43 may be slightly bulged outward.

  In describing the above-described embodiment, the illustrated container 1 has a capacity of about 700 ml, but the present invention can be preferably applied to a synthetic resin container having a volume of about 200 to 2000 ml.

  As described above, the present invention provides a flat, bottle-shaped positive pressure container that does not swell greatly in the minor axis direction even when the container has a positive pressure.

It is explanatory drawing which shows an example of the flat bottle-shaped positive pressure container which concerns on this invention. It is explanatory drawing which shows the other example of the flat bottle-shaped positive pressure container which concerns on this invention. It is explanatory drawing which shows the further another example of the flat bottle-shaped positive pressure container which concerns on this invention. It is explanatory drawing which shows the further another example of the flat bottle-shaped positive pressure container which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container 2 Mouth part 3 Shoulder part 4 Trunk part 41 Upper trunk part 42 Lower trunk part 43 Restriction part 5 Bottom part 5a Grounding surface

Claims (5)

With mouth, shoulder, torso, and bottom,
While the trunk portion has an upper trunk portion and a lower trunk portion whose cross section perpendicular to the height direction is elliptical,
The upper body part and the lower body part are arranged so that each major axis in the transverse section is substantially parallel,
And between the said upper trunk | drum and the said lower trunk | drum, it narrowed down and in the most narrowed part, along the direction parallel to the major axis in the said cross section of the said upper trunk | drum or the said lower trunk | drum The maximum length D2 is made shorter than the maximum length D3 along the direction parallel to the minor axis in the cross section of the upper body part or the lower body part, and the ratio D2 / D3 is 0.5 to A flat bottle-shaped positive pressure container in which a throttle portion is formed so as to be 0.95 . Between the upper body portion and the lower body portion, the maximum length along the direction parallel to the minor axis in each transverse section is substantially constant, and is parallel to the major axis in each transverse section. maximum length is narrowed so becomes shorter, flat bottle shape positive vessel according to claim 1, wherein the throttle portion is formed along the a direction. The flat bottle-shaped positive pressure container according to any one of claims 1 to 2 , wherein flatness of the upper body part and the lower body part is 1.2 to 2.0. The length D1 of the long axis in the cross section of the upper body portion or the lower barrel, the ratio D2 / D1 of the length D2, one of the claims 1 to 3 is from 0.25 to 0.85 The flat bottle-shaped positive pressure container according to claim 1. The most narrowed portion of the narrowing part from the ground plane of the bottom, one of the claims 1-4, which is arranged at a position spaced at a height of 1 / 4-3 / 4 of the height of the container A flat bottle-shaped positive pressure container according to crab.

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