JP4817179B2 - Synthetic plastic round bottle - Google Patents

Description

  The present invention is typified by a polyethylene terephthalate (hereinafter referred to as PET) resin biaxially stretched blow-molded bottle in which a plurality of reduced-pressure absorption panels that exhibit a reduced-pressure absorption function are formed in the body portion in a depressed manner in the circumferential direction. The present invention relates to the structure of a synthetic resin round bottle.

  The filling of content liquids that require sterilization at high temperatures, such as drinking water, tea, and fruit juice drinks, employs a so-called high temperature filling process in which the content liquid is filled at a high temperature of about 80 to 90 ° C. and immediately sealed with a cap. However, in this case, when the content liquid is cooled to room temperature or further to a low temperature, the inside of the bottle is in a reduced pressure state, the bottle is reduced in volume, and the body wall is deformed into a depressed shape.

  In many cases, a plurality of so-called reduced-pressure absorption panels are formed in parallel in the body so that the bottle is not deformed by distortion and the appearance is not impaired by the depression of the body wall. The vacuum absorption function is exerted.

  For example, Patent Document 1 describes a round bottle in which such a vacuum absorbing panel is inclined at a certain inclination angle and arranged in parallel in the circumferential direction. This inclined vacuum absorption panel, a so-called round bottle having an inclined panel, has a body portion provided with a vacuum absorption panel in addition to the inwardly curved deformation of the vacuum absorption panel due to the occurrence of vacuum in the bottle. Due to the reduced diameter deformation accompanying torsional deformation, a greater vacuum absorption function is exhibited.

In addition, a rib-like function is exhibited by the column portion between adjacent inclined panels, and a strong drag can be exerted against an external force from the lateral direction, which is abbreviated as a vending machine (hereinafter abbreviated as a vending machine). A rod-shaped stopper which is disposed in the dispensing passage in the inside and protrudes into the dispensing passage at a predetermined timing and exhibits a function of stopping the falling bottle while rotating around the central axis in the vending machine posture. It is possible to suppress the deformation due to the pressing force from the lateral direction due to the above, and the rolling in the vending machine is also good, and the bottle can be made excellent in the proper use in the vending machine.
Japanese Utility Model Publication No. 6-59207

  However, when using a round bottle with a vacuum absorbing panel in a vending machine, depending on the type of the vending machine, there is a problem that the shrink film covering the bottle is partially broken, and the stopper cannot reliably stop the falling of the bottle There was a problem that there was a case.

  Therefore, the object of the present invention is to clarify the cause of the shrinkage of the shrink film in the vending machine described above and the reason why the stopper cannot be reliably stopped by the stopper in the synthetic resin round bottle having the vacuum absorbing panel. The problem is to eliminate these problems by the shape of the bottle.

Among the present invention for solving the above technical problems, the means of the invention according to claim 1 is:
Synthetic resin round shape with a cylindrical body and a plurality of reduced pressure absorption panels surrounded by a stepped portion in parallel, in the circumferential direction in a depressed shape, and between adjacent reduced pressure absorption panels as pillars In the bottle
The bottom wall of the reduced pressure absorption panel is convex in a predetermined region of one or both of the upper end and the lower end of the reduced pressure absorption panel, and the upper edge or the lower edge of the lower edge is not protruded from the peripheral step . A convex part is formed on the bottom in the shape of a short frustum or a short polygonal frustum along the shape of the step part, and one end of the stopper disposed in the dispensing passage in the vending machine is a convex part Configured to abut against
It is in.

  The inventors of the present application analyzed the cause of the shrinkage of the shrink film in the vending machine and the reason why the stopper could not be stopped reliably with the stopper in the round bottle having the vacuum absorption panel. When the arranged rod-shaped stopper protrudes into the dispensing passage at a predetermined timing and stops falling of the falling bottle while rotating around the central axis in the vending machine posture, one of the rod-shaped stoppers is stopped. The end part touches the shrink film part that covers the vacuum absorption panel while forming a gap between the bottom and the bottom wall in a bridging manner, and further touches the bottom wall of the vacuum absorption panel while stretching the shrink film. It was found that this is the main cause of the shrinkage of the shrink film.

  In addition, when one end of the stopper abuts against the bottom wall of the vacuum absorbing panel as described above, the bottle has a central axis with respect to the rod-shaped stopper that protrudes in a horizontal posture in the dispensing passage. It is assumed that the posture is considerably inclined from the horizontal direction, and in combination with the momentum of the fall, it becomes an inverted posture and falls through the stopper to the dispensing outlet of the vending machine (hereinafter abbreviated as illegal fall). It was found that this is the main reason why the stopper cannot reliably stop the falling of the bottle.

  That is, the inventors of the present application have found that the main cause of the shrinkage of the shrink film and the unauthorized fall is that one end of the stopper is located opposite to the bottom wall located in a depressed shape in the vacuum absorbing panel. It came to create the structure of Claim 1.

  This problem can be solved by improving the structure of the vending machine, for example, by making the length of the vending machine sufficiently long, for example, but it is practically difficult to modify the vending machine already in use. Therefore, it is necessary to take into account the vending machines that are likely to cause problems and to deal with the bottle shape.

  And even if the shrink film part which coat | covers a decompression | absorption absorption panel in a bridge | bridging shape contact | abuts one end part of a rod-shaped stopper by the said structure of Claim 1, it opposes the part estimated to contact | abut. By forming the convex part by raising the bottom wall part of the vacuum absorption panel to the convex shape, the gap between the convex top wall and the shrink film is reduced there, so the shrink film breaks at the edge Can be effectively prevented.

  Moreover, since the inclination from the horizontal direction of the central axis of the bottle is limited by this convex portion, it is possible to reliably prevent unauthorized fall.

  Here, considering the length of the stopper disposed in the vending machine, even if the length of the stopper is relatively short with respect to the height of the bottle body, one end of the stopper is the bottle body. The upper end or lower end of the vacuum absorbing panel is in contact with the annular part, and the other end is in contact with either the lower end or the upper end of the reduced pressure absorbing panel.
The convex portion is formed in a truncated cone shape or a polygonal frustum shape along one of the upper end portion and the lower end portion of the vacuum absorbing panel, or in a predetermined region of both, along the shape of the step portion of the upper end portion or the lower end portion. By forming, the bottom wall can be shallowed in a relatively wide area of the upper end or lower end of the vacuum absorbing panel, and can be reliably and stably brought into contact with the other end of the stopper, It is possible to effectively prevent the shrink film from being broken and illegally dropped.
Even if the convex portion is formed in a relatively wide area as described above, the vacuum absorbing panel is formed in a depressed shape so as to surround the periphery with the stepped portion including the convex portion. The function is not greatly impaired.
And whether the convex part is formed on the upper end part, the lower end part or both of the reduced pressure absorption panel includes the shape of stoppers of various vending machines in which the target bottle is used. In consideration of the structure of the passage, it can be set appropriately so as to be compatible with any vending machine used.

  According to a second aspect of the present invention, in the first aspect of the invention, the vacuum absorption panel is inclined in a certain direction, and the inclined columnar portion between the inclined vacuum absorption panels adjacent to each other is inclined. .

  According to the second aspect of the present invention, the vacuum absorbing panel is a so-called inclined panel. As described above, a round bottle having an inclined panel is excellent in vacuum absorption function and has a good use suitability in a vending machine. However, since the column portion is inclined, When a bottle-shaped stopper placed parallel to the axial direction stops the fall of the bottle, if the vicinity of the central height position of the inclined column part comes into contact with the stopper, the central axis of the bottle with this contact part as a fulcrum May be greatly inclined with respect to the axial direction of the stopper.

For this reason, in the case of a round bottle having an inclined panel, the shrink film is broken in the vending machine as compared with a round bottle having a normal vacuum absorbing panel formed straight without being inclined with respect to the central axis direction. Although the problem of unauthorized dropping becomes more serious, it is possible to effectively solve such a problem by forming the convex portion at an appropriate position with the configuration of claim 2.

According to a third aspect of the present invention, in the first or second aspect of the invention, the corners of the vacuum absorbing panel are rounded to form an arc shape, and the widths of the upper base end portion and the lower base end portion of the column portion are set. To make it wide.

According to the configuration of claim 3 , the corners of the vacuum absorption panel are rounded to form an arc shape, and the width of the upper base end portion and the lower base end portion of the column portion is widened. When one end portion of the stopper comes into contact with the upper end portion of the column portion, it is possible to more effectively prevent the stretch film from being broken and illegally dropped.
In addition, the stress concentration at the corners during the depression deformation at the time of decompression can be alleviated, and a distorted depression-like deformation can be suppressed.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the first aspect of the invention, even if the shrink film portion that covers the decompression absorption panel in a bridging manner contacts the end of the rod-shaped stopper, the bottom wall portion of the decompression absorption panel is projected to the bottom. By forming the convex part upward, the gap between the top wall of the convex part and the shrink film is reduced, so that the shrink film can be effectively prevented from being broken by the end part.

Moreover, since the inclination from the horizontal direction of the center axis | shaft of the bottle at the time of contact | abutting with a stopper is limited by the convex part, an unauthorized fall can be prevented reliably.
In addition, the bottom wall can be shallowed in a relatively wide area of one or both of the upper end and the lower end of the reduced pressure absorption panel, and the convex portion can be reliably brought into contact with the end of the stopper. It can effectively prevent the shrinkage and unauthorized fall of the shrink film.

  In the invention according to claim 2, the round bottle having the inclined panel is more serious in the problem of the tear of the shrink film in the vending machine and the problem that the stopper cannot be stopped reliably by the stopper. However, such a problem can be effectively solved by forming a convex portion at an appropriate position of the reduced pressure absorption panel.

In the invention according to claim 3, the end of the stopper comes into contact with the upper base end portion of the wide column portion, so that it is possible to more effectively prevent the stretch film from being broken and illegally dropped.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the accompanying drawings.
1 to 3 show an embodiment of the synthetic resin round bottle of the present invention,
1 is an overall front view of the bottle, FIG. 2A is a plan sectional view taken along the line AA in FIG. 1, and FIG. 1B is a plan sectional view shown along the line BB. 3A is a developed view of the vicinity of three adjacent vacuum absorbing panels 12, and FIG. 3B is a longitudinal sectional view taken along line CC in FIG. 3A.

  The round bottle 1 of the present embodiment is a biaxial stretch blow molded product made of PET resin and has a nominal capacity of 500 ml. A cylindrical body 4 is connected to the upper end of the body 4 via a substantially hemispherical arc wall-shaped shoulder 3 with a thread and a neck ring on the outer peripheral surface. The bottom tube part 2 and the bottom part 5 are provided at the lower end of the body part 4 and are continuously provided with the center part of the bottom wall recessed into the bottle.

  Circumferential grooves 17 that function as peripheral ribs are formed at the upper end and the lower end of the body part 4, leaving the annular portions 18 directly below the upper peripheral groove 17 and directly above the lower peripheral groove 17, Eight decompression absorption panels 12 are formed in parallel in the circumferential direction so as to incline upwards so as to be surrounded by the stepped portion 10. In addition, eight column portions 11 that are also inclined to the right are left between the adjacent reduced pressure absorption panels 12.

The shape of the vacuum absorbing panel 12 is basically a parallelogram shape when viewed from the front, and there are a total of four corners 14. In this embodiment, the corners 14 are rounded to form an arc shape. In addition, the entire upper end and lower end are formed in a semicircular arc shape. Further, by making the corner portion 14 into an arc shape, the width is wide at the upper base end portion and the lower base end portion of the column portion 11. (See Fig. 3 (a))
Note that the upper end and the lower end of the column part 11 are connected to the annular part 18 via the rising horizontal step part 15, and the reduced pressure absorption composed of the reduced pressure absorption panel 12 and the column part 11 in the reduced pressure state. The volume reduction deformation of the functional portion is prevented from progressing to the circumferential groove 17.

  Further, at the upper end portion of each vacuum absorbing panel 12, a bottom wall 12b of the vacuum absorbing panel 12 is convexly raised, and a short truncated cone shape is formed along the shape of the semicircular arc-shaped step 10 on the periphery. The convex portion 13 is formed. The top of this convex part 13 is formed in the range which does not protrude from the step part 10 of a periphery (refer Fig.2 (a) and FIG.3 (b)).

  As will be described later, these convex portions 13 exhibit a function of preventing the shrink film from being broken by the end portion of the stopper disposed in the payout passage and the unauthorized fall that falls through the stopper in the vending machine. However, even if the convex portion 13 is formed in such a relatively wide area, the vacuum absorbing panel 12 is formed in a depressed shape so as to still surround the periphery with the step portion 10 including the convex portion. The vacuum absorption function is not significantly impaired.

  In addition, a concave groove 16 is formed in the corner 14LL on the lower left side of each decompression absorption panel 12 adjacent to the rising base end portion of the step portion 10 along a circularly chamfered shape. (See Figure 3)

  Here, according to the stress analysis in the reduced pressure state, in the round bottle that constitutes the reduced pressure absorption function portion with the inclined reduced pressure absorption panel 12 and the inclined column portion 11 as in the present embodiment, when the degree of reduced pressure increases, 4 is twisted and deformed so as to follow the inclined column part 11, and the body part 4 is deformed to reduce its diameter, so that an effective decompression absorption function is exhibited.

  At that time, a large tensile stress acts on the column part 11 along the inclination direction, and a relatively large stress concentration occurs in the corner part 14LL on the lower left side and the corner part 14UR on the upper right side. Buckling deformation tends to occur so that the wall is locally bent in the vicinity of the corner portions 14LL and 14UR. However, the concave groove 16 is formed in the corner portion 14LL and the above described in the corner portion 14UR. The convex part 13 exhibits a reinforcing effect and can effectively suppress the occurrence of buckling deformation.

Next, FIG. 4 is a schematic explanatory view showing the positional relationship between the bottle 1 and the rod-shaped stopper S disposed in the payout passage in the vending machine. The bottle 1 is covered with a shrink film F, and a gap is formed between the shrink film F and the bottom wall 12 b of the vacuum absorbing panel 12. As shown in FIG. 4, the stopper S is configured such that one end portion (the right end portion ER in FIG. 4) abuts on the annular portion 18 remaining at the lower end portion of the body portion 4. It is.
In FIG. 4 and FIG. 5 described later, the shrink film F is drawn with a dotted line so that it can be easily seen.

  Here, the length L of the stopper S is not necessarily the same depending on the vending machine and the design of the payout passage. If the length L is relatively short as in the example shown in FIG. The other end portion (left end portion EL in FIG. 4) comes to face the upper end portion of the reduced pressure absorption panel 12, causing the shrinkage of the shrink film F and the unauthorized fall as will be described later. In the case of a vending machine having a relatively long length L, the end EL is in contact with the annular portion 18 remaining on the upper end of the body 4, so that the shrink film F caused by the depressed portion of the vacuum absorbing panel 12 is caused. There is no problem of tearing or unauthorized falling.

FIG. 5 is a schematic explanatory view showing the postures of the three types ((a), (b), (c)) of the bottle 1 in the positional relationship between the bottle 1 and the stopper S shown in FIG.
FIG. 5A shows a case where the stopper is in contact with the stopper at the position of line JJ in FIG. 4, and the left end EL is in contact with the upper end of the pillar portion 11 and is a shrink film. F tearing and unauthorized fall do not occur.

  On the other hand, FIG. 5B shows a case where the stopper EL is in contact with the stopper at the position of the line KK in FIG. 4, and the end EL is in contact with the top of the convex portion 13. Since there is a slight gap G at the top, the posture of the bottle 1 is slightly inclined as compared with the case of FIG. 5A, but the gap G between the shrink film F and the bottom wall 12b is caused by this convex portion 13. Is getting smaller. That is, the shrinkage and shrinkage of the shrink film F do not occur due to the effect of the convex portion 13.

  FIG.5 (c) is equivalent to the comparative example which concerns on the state of FIG.5 (b), and shows the state of the example of the bottle in which the convex part 13 is not formed, and is the same as FIG.5 (b). Fig. 4 shows a case where the stopper is in contact with the KK line in Fig. 4. In this case, since there is no convex portion 13 and the gap G between the bottom wall 12b and the shrink film F remains large, the bottle 1 is greatly inclined with the edge portion of the inclined column portion 11 as a fulcrum, and the end of the stopper S The portion EL contacts the bottom wall 12b of the vacuum absorbing panel 12 so as to stretch the shrink film F. As a result, the shrinkage of the shrink film F occurs.

  Further, the momentum of the drop of the bottle 1 in the dispensing passage and the large inclination of the central axis of the bottle 1 described above are combined, and the casing is oriented in the direction shown by the white arrow in FIG. Will be displaced, become an inverted posture, and will slip through the stopper S and cause an illegal fall.

As mentioned above, although embodiment of this invention and its effect were demonstrated along one Example, this invention is not limited to the said Example. The round bottle of the present invention is not limited to a biaxial stretch blow-molded product made of PET resin, and the number of reduced pressure absorption panels formed is not limited to this example.
In the above embodiment, a so-called round bottle having an inclined panel has been described, but it is needless to say that the effect of the convex portion of the present invention is formed straight without being inclined with respect to the central axis direction. The present invention can be sufficiently exerted even for a round bottle having a normal vacuum absorbing panel.

And what kind of convex part is formed in which position of one or both of the upper end part and the lower end part of the vacuum absorption panel and in what range, the bottle product uses In consideration of the structure of the payout passage including the shape of stoppers of various vending machines to be used, it can be set appropriately so as to be compatible with any vending machine used.

  As described above, the synthetic resin round bottle having the reduced pressure absorption panel of the present invention eliminates the problem of shrink film breakage and unauthorized fall caused by the reduced pressure absorption panel in the vending machine, and has a reduced pressure absorption function. It is expected to be used in a wide range of applications as a round bottle with excellent vending machines.

It is a whole front view which shows one Example of the bottle of this invention. (A) is shown along the AA line in FIG. 1, (b) is a plane sectional view shown along the BB line. (A) is a developed view of the vicinity of three adjacent vacuum absorption panels in FIG. 1, and (b) is a longitudinal sectional view taken along the line CC in (a). It is a schematic explanatory drawing which shows the positional relationship of a bottle and the stopper in a vending machine. It is a schematic explanatory drawing which shows the attitude | position of three types ((a), (b), (c)) of the bottle in the positional relationship of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Bottle 2; Mouth part 3; Shoulder part 4; Trunk part 5; Bottom part 10; Step part 11; Column part 12; Depressurization absorption panel 12b; 15; horizontal step portion 16; concave groove 17; circumferential groove 18; annular portion F; shrink film G; gap S; stopper EL, ER;

Claims (3)

Barrel with a cylindrical shape a plurality of vacuum panels to exert vacuum absorption function (4) (12), so as to surround the periphery by the step portion (10), parallel formed circumferentially internal concave, adjacent In the round bottle with the column part (11) between the reduced pressure absorption panels (12),
In a predetermined region of either one or both of the upper end and the lower end of the reduced pressure absorption panel (12), the bottom wall (12b) of the reduced pressure absorption panel (12) is convex, from the step (10) at the periphery. In a range that does not protrude , along the shape of the step (10) at the periphery of the upper end or the lower end, a short frustoconical shape, or a short polygonal frustum, forms a convex portion (13),
A synthetic resin round bottle configured such that one end of a stopper disposed in a dispensing passage in a vending machine is in contact with the convex portion (13). The synthetic resin round bottle according to claim 1, wherein the reduced pressure absorption panel (12) is inclined in a certain direction, and the inclined column portion (11) is inclined between the inclined reduced pressure absorption panels (12). An arc-shaped with the corners (14) Tsunotori vacuum panels (12), according to claim constructed as to increase the width of the upper base end portion and Shitamoto end of the pillar portion (11) 1 or 2 The described synthetic resin round bottle.

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