JP5472581B2 - Packaging container with vacuum absorbing panel - Google Patents

Description

  The present invention relates to the structure of a synthetic resin bottle used as various drinking containers.

  Synthetic resin casings such as polyethylene terephthalate (hereinafter referred to as PET) resin are widely used as containers for various beverages. In this type of housing, it is required to reduce the wall thickness in order to reduce material costs, but the rigidity and strength of the housing as a result are sufficiently prevented, and deformation of the body wall due to pressure fluctuations in the housing. How to absorb water is a big problem in the shape design of the frame.

  As a solution to this problem, a spiral panel type plastic bottle provided with a plurality of spiral panels (also referred to as inclined panels) in the circumferential direction is known (for example, see Patent Document 1). Depressurization in plastic bottles after filling and sealing of beverages such as fruit juice, oolong tea, coffee, tea, etc. is due to the deformation of the spiral panel in the radial direction and the twist in the circumferential direction, and the inclination between the spiral panels. It is effectively absorbed under reduced pressure by twisting deformation in the circumferential direction of the column portion. The spiral plastic bottle provided with a plurality of spiral panels in the circumferential direction, as schematically shown in the conventional example in FIG. In the spiral panel having a shape, a tensile force acts in the long diagonal direction, and a large stress concentration occurs at the corner of the inclined panel. At that time, if the long diagonal is greatly inclined, there is a problem that the stress concentration at the corner of the inclined panel extends to the adjacent column part, and deformation such as depression and buckling is likely to occur. As a countermeasure, a cylindrical body as shown in FIG. 7 has a plurality of inclined panels inclined in a certain direction so as to be surrounded by a stepped portion, and is formed in parallel in the circumferential direction in a depressed shape. Form a concave groove adjacent to the base end of the step at an acute angle corner where stress is concentrated at least among the four corners of the upper and lower sides of the tilt panel. It has been proposed to do. By forming this concave groove, local buckling deformation of the peripheral wall portion including the column portion in the vicinity of the corner portion where stress is concentrated can be more effectively suppressed. However, the present invention suppresses deformation by the concave grooves, but has a drawback that the reduced pressure absorption effect due to the original torsional deformation is reduced.

  In general, in bottles with spiral panels, the column part of the vacuum absorption panel is inclined, so when a bottle is put into a vending machine's column and rolls down and the bottles overlap each other, the column has a large clearance from the bottle. (See FIGS. 3 to 5 of Patent Document 1) When the bottles are irregularly turned and positioned so that the inclined column portion and the vacuum absorbing panel are fitted (particularly, the column portion and the long diagonal line described above) When the bottles are positioned so as to overlap each other), the bottles are overlapped with the direction greatly changed in the column as they are, so that there is a problem of adverse effects such as clogging (oblique clogging).

  The object of the present invention is to maintain the reduced pressure absorption capability due to the torsional deformation of the container, which is an advantage of the spiral panel, and in the column of the vending machine, the column portion gets stuck in the spiral panel, and the bottle turns obliquely and clogs. The solution is to solve the problems that are likely to occur.

The packaging container provided with the reduced pressure absorption panel of the present invention has a shape in which the inclination of the middle part of the reduced pressure absorption panel column is smaller than the inclination of at least one of the upper part of the column or the lower part of the column, and the column width is minimized in the middle part of the column The column width increases as it goes to at least one of the upper and lower sides.

Furthermore, the packaging container provided with the reduced pressure absorption panel according to the present invention has a shape in which a plurality of ridge lines are provided in the column part.
Moreover, the packaging container provided with the reduced pressure absorption function of the present invention has a configuration in which the column portions adjacent to each other in the above configuration include a coupling portion for coupling at least one of the upper and lower ends to each other.
Furthermore, in addition to the above configuration, the peripheral surface having the largest diameter of the cross section of the container at the upper and lower sides is an annular shape, and the boundary portion is formed in a substantially polygonal shape close to a circle.

In the spiral plastic bottle of the present invention, the inclination of the middle part of the column of the spiral panel is smaller than the inclination of at least one of the upper part or the lower part of the pillar. It is possible to make it difficult for the effect of the panel corner stress concentration to reach the column portion. In addition, when the spiral plastic bottle of the present invention is applied to a vending machine, the inclination of the middle part of the pillar is reduced, so that the bottles are prevented from overlapping greatly in the column in the vending machine, and the vending machine is clogged. Can be suppressed.
In addition, there is a portion where the column width is minimum in the middle of the column, and the column width is increased as it goes to at least one of the upper and lower sides, so that the column width is increased at the upper end portion or the lower end portion of the column portion and the strength is increased. By doing so, it is possible to reinforce the upper end or lower end of the column part that is easily buckled and deformed.
Since the packaging container provided with the reduced pressure absorption panel of the present invention has a shape having a plurality of ridge lines as the above-mentioned column portion, the strength of the column portion is increased, and the buckling deformation of the column portion of the bottle is reduced. More can be prevented.
In addition, since this function and effect are provided with a coupling part for coupling adjacent column parts to each other at at least one of the upper and lower ends, the upper or lower part of the pillar part is connected in an annular shape. In the case of torsional deformation at the time of decompression, it is possible to effectively reinforce the circumferential direction above or below the column portion.

  In addition to the above configuration, the peripheral surface where the diameter of the cross section of the container is maximum at the upper and lower sides is an annular shape, and the boundary portion is formed in a substantially polygonal shape close to a circle. When horizontally stacked, the parts where the upper and lower containers come into contact are almost in contact with each other, and a stable and smooth movement is guaranteed when falling.

It is the figure which showed the spiral type plastic bottle of this invention, and the conventional type bottle. It is a cutting end view explaining the shape of a spiral plastic bottle of the present invention. The reduced pressure absorption panel shape of this invention is shown with the expanded view. It is the figure which compared and analyzed the deformation | transformation form at the time of the vacuum absorption of the helical plastic bottle of this invention, and a conventional bottle. It is a figure explaining the form from which the spiral plastic bottle shape of this invention differs. It is a figure explaining the form from which the spiral plastic bottle shape of this invention differs further. FIG. 4 is a development view showing still another vacuum absorption panel shape of the spiral plastic bottle of the present invention. It is the figure which showed the conventional spiral plastic bottle shape in consideration of the stress form at the time of vacuum absorption.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 2 and 3. FIG. 2 is a decompression absorption panel part, 2a is a spiral panel body, 3 is a column part of the panel, and 4 is a ridge line provided in the column part. The helical plastic bottle of this embodiment example is made of PET, and six helical panel bodies 2a are provided side by side in the circumferential direction. The column part 3 of the spiral panel has a shape in which the inclination of the middle part of the column is smaller than the inclination of the upper part of the pillar (above the middle part of the pillar) and the lower part of the pillar (below the middle part of the pillar).
Here, the inclination of the column portion means a line connecting the middle of the column width (virtual line. If the connected line is a curve, the tangent line) in the container vertical direction (in FIG. 2, the spiral plastic bottle 1 2 is the inclination of the ridge line 9 that is the central ridge line of the ridge line 4 to be described later in FIG.
The middle part of the pillar is a region of 1/7 to 6/7 to 3/7 to 4/7 with respect to the height of the pillar part. The height of the pillar part is the spiral panel body 2a adjacent to both sides of the pillar part 3. 2 is the height H in FIG. In FIG. 2, the middle part of the column is generally a portion of the cutting position BB to the cutting position CC, and is a region of 3/10 to 7/10 from the bottom in the column height. In addition, when the upper end or lower end of the spiral panel main body is different between the left and right sides of the column part, the height of the column part may be determined by taking the average of the left and right as the upper end or the lower end of the column part.
In addition, when the height of the column portion occupies a range of 4/9 to 7/9 with respect to the total height of the container, the invention effect is exhibited in this range in which the influence of the obliquely clogging of the vending machine is remarkable, and the vacuum absorption capacity is sufficient. Can be secured.

By adopting the above structure, the vacuum absorption in this bottle proceeds as each spiral panel body 2a of the present invention shown in FIG. 1 bends and curves around a diagonal virtual inclination line. 3 has a structure having a column middle portion with a small inclination, the inclination of the diagonal virtual inclination line of the spiral panel body 2a can be reduced as compared with that in which the column portion is uniformly inclined. Therefore, since the area where the upper end or the lower end of the column part 3 is on the extension of the diagonal virtual inclination line can be narrowed, it is difficult for the column part 3 to be affected by the stress concentration at the upper and lower corners of the spiral panel body 2a. be able to.
This phenomenon will be verified with reference to FIG. The figure shows the state of the conventional spiral panel type bottle and the above-described embodiment of the present invention before deformation and after deformation under reduced pressure, and the deformation is analyzed. The lower stages A to D are the products of the above embodiment of the present invention. In the figure, A is a perspective view showing the appearance of a conventional spiral panel bottle, and B is the original shape before deformation. Deformation under reduced pressure extends to the center of the column portion so that the corner portion of the long diagonal of the substantially parallelogram-shaped spiral panel body 2a, which is a stress concentration portion, is depressed, and the deformation is folded back. The column portion plays a role as a skeleton for maintaining the bottle shape, and the deformation of this portion is difficult to return to the shape when the decompressed bottle returns to normal pressure. On the other hand, the decompression deformation in the embodiment product of the present invention remains in the depression of the corner portion of the long diagonal of the substantially parallelogram spiral panel body 2a which is the stress concentration portion, and the column portion is only bent sideways. No depression deformation has occurred in the center of the width of the column. For this reason, the shape of the bottle is maintained, and when the pressure is recovered, the shape is smoothly restored.

Moreover, the column part 3 can fully exhibit the reduced pressure absorption capability by the twist of a bottle similarly to the bottle provided with the conventional helical pressure reduction absorption panel by inclination of a column upper part and a column lower part.
Further, the column width of the middle portion of the column is the narrowest in the region near the center of the height of the column unit 3, and goes up and down with a substantially uniform column width as it is. And as the width approaches the BB cutting position and the CC cutting position, the width gradually increases, and the column width clearly increases at the upper and lower columns. Although the upper end part and lower end part of the column part 3 are places where it is easy to buckle and deform | transform, intensity | strength can be raised because the pillar part 3 was made into such a structure.
These structures and the effects thereof, for example, exhibit the above-described effects by reducing the inclination of the middle part of the column even for a bottle having a remarkable inclination at the upper part and the lower part of the pillar as shown in FIG. The bottle 1 is formed such that the cross section of the column portion 3 is not convex but is concave between the ridge lines 4 like the panel portion 2.

In addition, as shown in FIG. 2, in this embodiment, the ridgeline 9 at the center of the column part 3 and the three ridgelines 4 in which one step ridgeline is arranged on the left and right around the ridgeline 9 are formed. This ridgeline 4 becomes a skeleton, and the column part 3 is further reinforced.
Moreover, the coupling | bond part 10 is provided so that adjacent pillar part 3 may mutually couple | bond together in an upper-lower-end part. With this structure, the upper and lower portions of the pillar portion are connected in an annular shape, and the strength in the circumferential direction can be reinforced at the upper and lower portions of the pillar portion at the time of torsional deformation during decompression of the container. At the lower end of the reduced pressure absorption panel portion 2, the plurality of ridge lines 4 are in contact with the bottom-side annular portion 6 where the diameter of the cross section of the container is maximized at substantially equal intervals to form a substantially regular 18-gon. A ridge line 7 designed as an extension of the ridge line 4 is brought into contact with the shoulder annular portion 5 having the largest diameter in the container cross section, and a substantially regular octagon is also formed here. By adopting such a container shape, when horizontally stacked in a vending machine, the parts where the upper and lower containers contact are the shoulder annular part 5 and the bottom annular part 6, and even if they are slightly misaligned, the boundary part remains Because it is a nearly regular 18-sided shape that is nearly circular, bottles that are thrown into the vending machine and stacked stably sideways without causing diagonal clogging are almost in contact with each other, with one bottle coming from the vending machine. Stable and smooth movement is guaranteed in the case of small drops when paid out one by one.

  Different forms of the spiral plastic bottle shape according to the present invention shown in FIG. 5 will be described. In this embodiment, the inclination of the column part 3, the column width, the ridge line 4, and the coupling part 10 are the same as those in the above embodiment. The difference from the previous embodiment is the shape of the bottle shoulder on the upper side of the reduced pressure absorption panel portion 2, and as a result, the ratio of the reduced pressure absorption panel portion 2 to the height dimension of the bottle is increased. At the lower end of the vacuum absorption panel 2 provided with the six spiral panel bodies 2a, the three ridgelines 4 provided in each of the six pillars 3 are substantially equidistant in the bottom annular portion 6 where the diameter of the container cross section is maximum. However, the shoulder annular portion 5 having the largest diameter in the cross section of the container is the upper end portion of the reduced pressure absorption panel portion 2 in the same manner as in the previous embodiment. And through an annular groove 8. A plurality of ridgelines 4 of the pillar portion 3 are in contact with the annular groove portion 8 at substantially equal intervals to form a substantially regular octagon. The shoulder annular portion 5 is in contact with a ridgeline 7 designed as an extension of the ridgeline 4, and a substantially regular octagon is formed here. By adopting such a container shape, when the containers are stacked horizontally in the vending machine in the same manner as in the above embodiment, the upper and lower containers are in contact with each other at the shoulder annular part 5 and the bottom annular part 6, which are slightly misaligned. Even so, the boundary is a nearly regular 18-sided shape that is almost circular, so that the contact surfaces are almost in contact with each other, and stable and smooth movement is guaranteed when a bottle is dispensed from the vending machine one by one. Has the effect.

  The present invention is not limited to the above-described embodiment, and can be changed without departing from the scope. For example, as in the four forms shown in the panel development view of FIG. 7, the inclination of the middle part of the pillar may be reduced with respect to only one of the upper part and the lower part of the pillar. In order to further increase the vacuum absorption capacity, the direction in which the middle part of the column is inclined (upward to the right or upward to the left) is the same as the direction in which the upper part of the column and the lower part of the column are inclined. However, it can be changed within a range that satisfies the decompression performance. For example, if at least one of the upper part of the pillar or the lower part of the pillar is inclined, the middle part of the pillar may not be inclined. If the inclination is smaller than at least one of the upper part of the pillar or the lower part of the pillar, the direction of inclination may be reversed. Also, the column width may be formed so as to increase from the center of the column toward either the upper side or the lower side. Further, the material is not limited to PET, and any thermoplastic resin can be applied.

  The packaging container provided with the reduced pressure absorption panel of the present invention is expected to be used for the container that is used in a reduced pressure state. For example, it is expected to be used for so-called high-temperature filling applications in which liquids such as fruit juice drinks that require sterilization, oolong tea, coffee, tea, etc. are filled at a high temperature of about 85 ° C. and then sealed, and then cooled to below room temperature. Effective when the container is decompressed. The packaging container made of the synthetic resin of the present invention has a sufficiently low pressure absorption function, and achieves high rigidity against lateral load and high strength without increasing the amount of resin. A wide range of applications is expected as a container that can be used with peace of mind in places such as vending machines where deformation due to lateral load is a problem.

DESCRIPTION OF SYMBOLS 1 Spiral panel type bottle 2 Decompression absorption panel part 2a Spiral panel main body 3 Pillar part 4 Ridge line 5 Shoulder ring part 6 Bottom side ring part 7 Ridge line designed as extension line 8 Annular groove part 9 Ridge ridge line 10 Joint part

JP 2000-142654 A “Plastic Bottle” Published May 23, 2000 JP 2007-269359 A “Synthetic Resin Round Bottle” Published on October 18, 2007

Claims (4)

The inclination of the central part of the spiral vacuum absorption panel is smaller than the inclination of at least one of the upper part or the lower part of the pillar, and the central part of the pillar has a position where the pillar width is minimum, and the pillar width increases toward at least one of the upper and lower sides. A packaging container provided with a reduced pressure absorption panel characterized by having a widened shape . The packaging container provided with the reduced pressure absorption panel according to claim 1 , wherein the pillar portion has a shape including a plurality of ridge lines. The packaging container provided with the reduced pressure absorption function according to claim 1 or 2 , wherein the adjacent column parts include a coupling part for coupling at least one of upper and lower ends to each other. The decompression according to any one of claims 1 to 3, wherein a peripheral surface having a maximum diameter of a cross section of the container at an upper side and a lower side has an annular shape, and a boundary portion thereof is formed in a substantially polygonal shape close to a circle. Packaging container with absorption function.