JP5065363B2 - Square beverage plastic container and beverage product using the same - Google Patents

Description

  The present invention relates to a plastic container for rectangular beverages used as a container for non-carbonated beverages such as tea, water, fruit juice drinks, sports drinks, and in particular, has a buckling strength against a longitudinal compression load even if it is light and thin. In addition, the present invention relates to a plastic container for a square beverage with less bottle bending (a deformation in which the container main shaft tilts sideways with respect to the container main shaft when there is no load when a vertical compression load is applied to the container).

  PET bottles (polyethylene terephthalate resin bottles) are frequently used as plastic containers for beverages used as containers for non-carbonated beverages such as tea, water, fruit juice beverages, and sports drinks. Plastic containers for beverages are strongly demanded to be lighter and thinner in terms of environment and cost. On the other hand, plastic containers for beverages are transported and stored in cardboard boxes in units of several to several tens. However, since cardboard boxes are stacked at this time, longitudinal compressive load is applied to plastic containers for beverages. It takes. Then, the technique of the plastic bottle which has buckling strength with respect to a longitudinal compression load is disclosed (for example, refer patent document 1 or 2).

  In the technique of Patent Document 1 or 2, the occurrence of buckling is reduced by linear ribs in the horizontal direction or annular ribs that circulate horizontally. Here, large buckling strength is required for containers. Once buckling occurs during loading in warehouses or loading in logistics, etc., buckling deformation traces remain in the containers, reducing the product value of aesthetics. Because.

Japanese Utility Model Publication No. 6-69114 Japanese Patent Laid-Open No. 11-236022

  However, although the technique described in Patent Document 1 or 2 seems to increase the buckling strength of a plastic container for beverages by a linear rib in the horizontal direction or an annular rib that circulates horizontally, Suppression of bottle bending when applied is not enough.

  In particular, a container filled with a non-carbonated beverage has an even higher buckling strength than a carbonated beverage product filled at a high internal pressure because the internal pressure is reduced or normal pressure. However, it is desired that the bottle bends little. Furthermore, a 1.5-liter or 2-liter large-capacity plastic container for beverages adopts a square shape (a horizontal cross-sectional shape is often a rectangle with a corner cut off) in consideration of storage properties in a refrigerator or the like. However, even in such a rectangular container, it is desired that the container has a buckling strength and has little bottle bending.

  Accordingly, an object of the present invention is to provide a container having a required buckling strength and a structure with little bottle bending in a rectangular beverage plastic container for filling a non-carbonated beverage. It is another object of the present invention to provide a non-carbonated beverage product that is less likely to cause a decline in aesthetic product value using the lightened and thinned container.

  As a result of intensive investigations to solve the above-mentioned problems, the inventors of the present invention have made a specific arrangement of wavy ribs having a specific shape on the body of the container, thereby buckling when a longitudinal compression load is applied. It was found that the bottle bending can be reduced and the present invention has been completed. That is, the plastic container for rectangular beverage according to the present invention has a mouth portion, a shoulder portion, a label portion, a trunk portion and a bottom portion in order from the top, and the trunk portion has a long side wall, a short side wall, In a square beverage plastic container for filling non-carbonated beverages, the rib portion having a transverse wave having a vertical direction as an amplitude direction is provided in the square beverage plastic container for filling a non-carbonated beverage. Are formed by arranging a plurality of ribs having the same shape so that the crests of the ribs are aligned vertically and rotating the side surfaces, and the transverse wave-shaped ribs are arbitrarily arranged on the vertical center line passing through the width center of the long side wall of the body portion. A point-symmetric wave shape with a point of symmetry as a symmetric point, and a point-symmetric wave shape with an arbitrary point on the vertical center line passing through the center of the width of the short side wall of the body as a symmetric point In addition, the rib formed on the long side wall and the rib formed on the short side wall are connected in a state where the corrugated shape is maintained at the corner wall. It is to become, and, characterized in that in the point of symmetry either on the same horizontal plane.

  In the plastic container for rectangular beverages according to the present invention, it is preferable that a symmetrical point of the transverse wave-shaped rib exists on a vertical center line passing through the width center of the corner wall. Even in the corner wall, the reinforcing effect by the rib can be homogenized, and buckling and bottle bending are more easily suppressed.

  In the rectangular beverage plastic container according to the present invention, the transverse wave-shaped rib has one upward crest and one downward crest per one of the long side walls, and the short rib. Preferably, each side wall has one upward wave crest and one downward wave crest. By providing one wave crest portion in the upper direction and one wave crest portion in the lower direction, the reinforcing effect by the rib can be homogenized in both the long side wall and the short side wall, and the number of wave crest portions can be reduced. By setting the required minimum number, it becomes easy to design the gap between the ribs closer.

  In the plastic container for beverages according to the present invention, a plurality of annular ribs whose side surfaces are circulated in the horizontal direction are arranged side by side on the upper side of the body portion, and the transverse wave-shaped ribs are formed on the lower side. It is preferable to form. Since deformation is likely to occur below the body portion of the container, it is possible to effectively suppress container deformation such as buckling of the container and bending of the bottle by disposing the transverse wave rib at the portion.

  In the square beverage plastic container according to the present invention, the amplitude of the transverse wave-shaped rib is preferably larger than the rib width. Since the lower rib edge at the upper wave crest and the upper rib edge at the lower wave crest are separated when the container height direction is taken as an axis, the cross section of the container main axis (that is, the horizontal plane) )), There is no plane crossing the transverse wave-like rib over the entire circumference of the body, and as a result, it is particularly effective in suppressing bottle bending.

  The beverage product according to the present invention is characterized in that the rectangular beverage plastic container according to the present invention is filled with a non-carbonated beverage.

  The plastic container for rectangular beverages for filling non-carbonated beverages according to the present invention has necessary buckling strength and can reduce bottle bending. In addition, non-carbonated beverage products can be provided in this lightweight and thin container, and at this time, deformation of the container during distribution and storage is suppressed, and the appearance of the product may be impaired before reaching the consumer. Few.

It is a general-view figure which shows the 1st form of the plastic container for square drinks concerning this embodiment, (a) is a left view, (b) is a front view, (c) shows a top view. It is a perspective view of the container shown in FIG. It is a general-view figure which shows the 2nd form of the plastic container for square drinks concerning this embodiment, (a) is a left view, (b) is a front view, (c) shows a top view. It is a perspective view of the container shown in FIG. It is a general-view figure which shows the 3rd form of the plastic container for square drinks concerning this embodiment, (a) is a left view, (b) is a front view, (c) shows a top view. It is a perspective view of the container shown in FIG. It is a graph which shows the result of evaluation of the compressive strength of a container. It is a graph which shows the result of evaluation of bottle bending in a bottle simple substance. It is a graph which shows the result of evaluation at the time of pallet stacking. It is a general-view figure which shows the plastic container for square-shaped drinks of the comparative example 1, (a) is a left view, (b) is a front view, (c) shows a top view. It is a perspective view of the container shown in FIG. It is a general-view figure which shows the plastic container for square type | molds of the comparative example 2, (a) is a left view, (b) is a front view, (c) shows a top view. It is a perspective view of the container shown in FIG.

  Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiment described below is an example of the configuration of the present invention, and the present invention is not limited to the following embodiment. Various modifications may be made as long as the effects of the present invention are achieved.

  FIG. 1 is a schematic view showing a first form of a plastic container for rectangular beverage according to the present embodiment, wherein (a) is a left side view, (b) is a front view, and (c) is a plan view. FIG. 2 is a perspective view of the container shown in FIG. The plastic container 100 for square drinks according to the present embodiment shown in FIGS. 1 and 2 has a mouth part 1, a shoulder part 2, a label part 3, a trunk part 4 and a bottom part 5 in order from the top, and a trunk. The part 4 includes a long side wall 6 (6a, 6b), a short side wall 7 (7a, 7b), and a corner wall 8 (8a, 8b, 8c, 8d) connecting the long side wall 6 and the short side wall 7. It is a plastic container for square drinks for filling non-carbonated drinks. The square beverage plastic container 100 has a transverse wave-shaped rib 9 (9a, 9b) whose vertical direction is an amplitude direction, and a wave crest portion 10 (10a, 10b) of the rib 9 having the same shape. 11 (11a, 11b) are arranged side by side so that the top and bottom are aligned and the side surfaces are circulated, and the transverse wave-shaped rib 9 is on the vertical center line X passing through the width center of the long side wall 6 of the body 4 An arbitrary point on the vertical center line Y that has a point-symmetric wave shape with the symmetry point 12 (12a, 12b) as the symmetry point 12 and passes through the width center of the short side wall 7 of the trunk portion 4 is a symmetry point. 13 (13a, 13b) having a point-symmetric wave shape, and the rib formed on the long side wall 6 and the rib formed on the short side wall 7 are in a state where the wave shape is maintained at the corner wall 8. And the symmetry points 12a and 13a are both on the same horizontal plane, and the symmetry points 12b and 13b are Deviation is also on the same horizontal plane.

  The mouth portion 1 is usually formed with a diameter of 1.5 to 4 cm so that the beverage of the contents can be easily poured, and the shoulder portion 2 is connected to the label portion 3 having a larger trunk diameter toward the label portion. The diameter is expanded to form a cone. In addition, although the shoulder part 2 of the container shown in FIG.1 and FIG.2 is formed from the some cut surface, you may form in a curved surface. The label portion 3 is provided with a product display label such as a shrink label or a roll label on the outside thereof. The body part 4 is a place that is mainly gripped by the consumer, and is provided with a body diameter that is substantially the same as that of the label part 3, or has a longer side and a shorter side than the label part 3 in order to prevent the label from rubbing. Both are given a diameter of about 1 mm larger. The bottom 5 is provided with a plurality of vertical ribs to improve the strength, and realizes a self-supporting type.

  Plastic containers for beverages are obtained by blow molding, preferably biaxial stretch blow molding. The plastic material for beverages is preferably made of PET resin, but other thermoplastic resins may be used as necessary. Further, the plastic container has a square shape, and includes a long side wall 6, a short side wall 7, and a corner wall 8 as shown in FIGS. In addition, the shape whose long side 6 and the short side of the short side wall 7 are the same length, ie, a square shape with a substantially square cross section, may be used. FIG. 3 is a schematic view showing a second form of the plastic container for rectangular beverage according to the present embodiment, wherein (a) is a left side view, (b) is a front view, and (c) is a plan view. FIG. 4 is a perspective view of the container shown in FIG. As shown in the square beverage plastic container 200 of FIGS. 3 and 4, the corner wall 8 has an R surface whose horizontal cross section is an arc shape or an elliptical arc shape, and a boundary 24 b between the long side wall and the corner wall and a short surface. It is preferable that the boundary 24a with the side wall and the corner wall is on a curved surface. Further, as shown in FIGS. 1 and 2, the corners may be chamfered, and the boundary 24b between the long side wall and the corner wall and the boundary 24a between the short side wall and the corner wall may be on a curved surface. By making the corner wall 8 a shape with chamfered corners, a cut-like appearance can be provided. The corner wall 8 can be elastically deformed by having an annular rib that circulates horizontally while having a structure that supports a longitudinal compression load.

  For example, the plastic container for rectangular drinks has a capacity of 500 ml to 2 liters, but a container having a capacity of 1.5 to 2 liters, which requires a buckling strength, is particularly suitable. For example, the height of the plastic container is 200 to 370 mm, and the cylinder diameter extrapolated by a rectangle, that is, the cylinder diameter approximated by a rectangle surrounded by a tangent line between the long side wall and the short side wall is (60 to 120) × (60 to 100). ) Mm, and the body thickness is 0.10 to 0.30 mm. In the case of a bottle for aseptic filling, the barrel thickness is preferably 0.10 to 0.30 mm. Moreover, it can also be set as the container for hot filling, In this case, it is preferable that a trunk | drum thickness shall be 0.20-0.50 mm. The present invention is suitable as a aseptic filling bottle that is required to have a thin wall thickness when the barrel thickness is 0.10 to 0.30 mm. Note that a plastic container having a capacity of 500 ml or less and a height of less than 200 mm can also be a plastic container having buckling resistance and little bottle bending. In this case, it is possible to cope with this by reducing the size while maintaining a similar shape with the plastic container having the above dimensions as a reference.

  In the rectangular beverage plastic container according to the present embodiment, as in the rectangular beverage plastic container 100 of FIG. 1 or FIG. The diaphragm-shaped grip portion 25 may be formed deeper than this. The depth of the grip portion is, for example, 2.0 to 4.5 mm, preferably 2.5 to 3.5 mm. The boundary with the label is conspicuous, and the consumer can visually recognize the gripping place of the container. Further, as shown in the square beverage plastic container 200 of FIGS. 3 and 4, an emboss may be provided in the center of the long side wall 6 at the upper end portion of the body portion 4, and this may be used as the gripping emboss portion 15. The depth of the embossing portion 15 for grip is 6 to 15 mm, for example.

  The transverse wave-shaped ribs 9 (9a, 9b) having the vertical direction as the amplitude direction have a rib width of, for example, 4 to 7 mm, preferably 5 to 6 mm. The rib width is preferably a constant width. Here, it is preferable that the transverse wave-shaped rib 9 in the long side wall 6 and the short side wall 7 is deeper than the transverse wave-shaped rib 9 in the corner wall 8. In the long side wall 6 and the short side wall 7, the transverse wave-shaped rib 9 is deep, so that a force is applied to push the wall toward the inside of the container when the container is gripped. It becomes easy. Moreover, since the depth of the transverse wave-shaped rib 9 is shallow in the corner wall 8, it has a structure having elasticity while withstanding a longitudinal compression load. Then, as shown in the square beverage plastic container 100 shown in FIGS. 1 and 2 or the square beverage plastic container 200 shown in FIGS. 3 and 4, the lateral sides of the long side wall 6 and the short side wall 7 are the same. The wavy rib 9 preferably has a V-shaped groove in cross section in order to form the rib deeply. The strength is further improved against the force of pushing the wall surface toward the inside of the container. And in order to form a rib shallowly in the corner wall 8, it is preferable that it is a cross-sectional U character type groove | channel. It can be set as the structure which supports a longitudinal compression load more in the corner wall 8. FIG. 3 and 4, when the corner wall 8 is an R plane, the boundary between the long side wall 6 and the corner wall 8 and the boundary between the cross-section V-shaped groove and the cross-section U-shaped groove. And the boundary between the short side wall 7 and the corner wall 8 and the boundary between the cross-section V-shaped groove and the cross-section U-shaped groove are preferably matched. The longitudinal compressive load can be supported over the entire horizontal circumferential direction of the corner wall 8, and the strength is improved with respect to the force pushing the wall surface in the container inward direction over the entire long side wall 6 and short side wall 7. The depth of the cross-section V-shaped groove is, for example, 2.0 to 4.0 mm, and the depth of the cross-section U-shaped groove is, for example, 1.0 to 2.0 mm. The depth of the cross-section V-shaped groove is preferably larger than the depth of the cross-section U-shaped groove. In order to realize such a configuration, for example, when the cross-sectional U-shaped groove is a single-step groove, the cross-sectional V-shaped groove is a deeper two-step groove.

  A plurality of transverse wave-shaped ribs 9 are arranged so that the positions of the upward crest portions 10a, 10b of the ribs 9a, 9b having the same shape are aligned vertically and the positions of the downward crest portions 11a, 11b are aligned vertically. Form. The square beverage plastic container 100 shown in FIGS. 1 and 2 shows a configuration in which two transverse wave-shaped ribs 9 are arranged side by side. In the square beverage plastic container 200 shown in FIGS. 3 and 4, the transverse wave-like rib 9 is shown. A configuration in which three are arranged in parallel is shown. FIG. 5: is a general-view figure which shows the 3rd form of the plastic container for square drinks concerning this embodiment, (a) is a left view, (b) is a front view, (c) shows a top view. FIG. 6 is a perspective view of the container shown in FIG. 5 and 6 is a form in which six transverse wave-shaped ribs 9 are juxtaposed, and the ribs 26 provided on the label part 3 are all annular ribs that are not corrugated, The provided ribs 9 are all transverse wave-shaped ribs. In any of the square beverage plastic containers shown in FIGS. 1 to 6, the transverse wave-shaped rib 9 is formed so as to go around the side surface of the body portion 3. In other words, the transverse wave-shaped ribs 9 are not provided in a spiral shape, but are each closed at the start point and the end point that coincide with each other. The transverse wave-shaped ribs 9 are closed one by one, and there is no starting point and ending point of the rib as in a spiral shape, so that there is little difference in strength depending on the position in the circumferential direction with respect to the bottle bend.

  As shown in FIG. 1 (a), the transverse wave-shaped rib 9 (9a, 9b) has an arbitrary point on the vertical center line X passing through the center of the width of the long side wall 6 of the body 4 as a symmetric point 12 (12a , 12b). For example, the upward wave crest 10a is point-symmetric with respect to the wave crest 11a in the downward direction with respect to the symmetry point 12a. The upward wave crest 10b is point-symmetric with respect to the wave crest 11b in the downward direction with respect to the symmetry point 12b.

  Further, as shown in FIG. 1B, the transverse wave-shaped rib 9 (9a, 9b) has an arbitrary point on the vertical center line Y passing through the center of the width of the short side wall 7 of the body 4 as a symmetric point 13. It has a point-symmetric wave shape (13a, 13b). As described above, the transverse wave-shaped rib 9 (9a, 9b) has a point-symmetric shape in the short side wall 7 as in the case of the long side wall 6. However, since the horizontal width of the short side wall 7 is smaller than that of the long side wall 6, the distance between the upward crest portion 21a and the symmetry point 13a and the distance between the downward crest portion 22a and the symmetry point 13a are long sides. It is shorter than the corresponding distance in the wall 6. Further, the distance between the upward wave crest 21 b and the symmetry point 13 b and the distance between the downward wave crest 22 b and the symmetry point 13 b are shorter than the distance corresponding to the long side wall 6. That is, when the wavelength of the transverse wave-like rib 9 existing on the short side wall 7 is compared with the wavelength of the transverse wave-like rib 9 existing on the long side wall 6, it exists on the short side wall 7 according to the width of the wall. The wavelength of the transverse wave-shaped rib 9 is short. In this way, by adjusting the wavelength according to the width of the wall, it is possible to arrange the same number of wave crests in the upper direction and wave crests in the lower direction on the long side wall 6 and the short side wall 7 respectively. Therefore, the buckling strength and the strength against bottle bending are uniform in the trunk circumferential direction.

  As shown in FIGS. 1 and 2, the ribs formed on the long side wall 6 and the ribs formed on the short side wall 7 are connected to each other while maintaining the wave shape at the corner wall 8. Here, in order to maintain the wave shape, it is preferable that the symmetrical points 14a and 14b of the transverse wave-like ribs exist on the vertical center line Z passing through the center of the width of the corner wall 8. Even in the corner wall, the reinforcing effect by the ribs can be made uniform, and buckling and bottle bending are more easily suppressed.

  The symmetry points 12a and 13a are on the same horizontal plane, and the symmetry points 12b and 13b are on the same horizontal plane. The transverse wave-shaped rib 9 (9a, 9b) has a wave shape that swings in the vertical direction around the same horizontal plane. In the long side wall 6 and the short side wall 7, the buckling strength and the strength against bottle bending are uniform in the trunk circumferential direction. Furthermore, it is preferable that the symmetry points 12a, 13a, and 14a are on the same horizontal plane, and the symmetry points 12b, 13b, and 14b are on the same horizontal plane. Not only the long side wall 6 and the short side wall 7 but also the corner wall 8 has a uniform buckling strength and strength against bottle bending in the circumferential direction.

  As in the rectangular beverage plastic container 100 of FIGS. 1 and 2, the transverse wave-shaped rib 9a has one upward crest portion 10a and one downward crest portion 11a per long side wall 6 respectively. It is preferable that each of the short side walls 7 has one upward crest 22a and one downward crest 22b. The same applies to the transverse wave-shaped rib 9b. By providing each one crest portion in the upward direction and one crest portion in the downward direction, the reinforcing effect by the ribs can be made uniform in both the long side wall and the short side wall, and the width of the rib is From the point of mold workability, moldability of the container and strength improvement by ribs, it is about 3 to 8 mm, but the design to make the gap between ribs closer by setting the number of wave crests to the minimum necessary number. It becomes easy to do.

  As shown in FIGS. 1 and 2, the rectangular beverage plastic container 100 and the rectangular beverage plastic container 200 in FIGS. It is preferable to form a plurality of the annular ribs 23 arranged side by side and to form the transverse wave-shaped rib 9 on the lower side. Since deformation is likely to occur below the container body 4, the deformation of the container such as the buckling of the container and the bending of the bottle can be effectively suppressed by arranging the transverse wave-shaped rib 9 in the part. It is more preferable that the annular ribs 23 whose side surfaces circulate in a horizontal direction that is not corrugated are arranged at equal intervals. Further, it is more preferable that the transverse wave-shaped ribs 9 are arranged at equal intervals.

  Like the rectangular beverage plastic container 200 of FIGS. 3 and 4, the amplitude of the transverse wave-shaped rib 9 is preferably larger than the rib width. Since the rib lower edge 30 in the upward wave crest and the rib upper edge 31 in the downward wave crest are separated from each other when the container height direction is taken as an axis, the cross section of the container main axis (that is, the horizontal plane) )), There is no plane crossing the transverse wave-like rib over the entire circumference of the body, and as a result, it is particularly effective in suppressing bottle bending. The square beverage plastic container 100 of FIGS. 1 and 2 and the square beverage plastic container 300 of FIGS. 5 and 6 are embodiments in which the amplitude of the transverse wave-shaped rib is equal to or less than the rib width.

  The plastic container for rectangular beverages according to the present embodiment is suitably used for products filled with non-carbonated beverages, especially for volumes of 1 to 2 liters, and further for volumes of 1.5 to 2 liters.

  Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not construed as being limited to the examples.

Example 1
As Example 1, the shape of the container (1.5 liter) shown in FIGS. 1 and 2 was used. That is, the container height is 307 mm, the body diameter is 90 × 77 mm, the body thickness is 0.21 mm (there is a thickness distribution of 0.19 to 0.24 mm depending on the location, and the average thickness is 0.21 mm). It was. Of the 11 annular ribs, the lower two were transverse wave-shaped ribs. The width of the transverse wave-shaped rib was 6.90 mm, the depth (U character groove) was 1.70 mm, and the depth (V character groove) was 2.50 mm. The horizontal annular (not transverse wave) rib provided on the label portion 3 had a width of 7.80 mm, a depth (U character groove) of 2.80 mm, and a depth (V character groove) of 3.70 mm. The width of the horizontally annular (not transverse wave) ribs (from the top to the fourth of the ribs on the body) provided on the body 4 was 7.80 mm, and the depth (U character groove) was 2.80 mm. Further, at the boundary between the label portion 3 and the body portion 4, a grip portion having a depth of 5.00 mm and a width of 9.00 mm is provided separately from the 11 annular ribs. The amount of PET resin used was 38 g. This container was filled with 1.5 liters of water by aseptic filling and sealed with a lid.

(Evaluation of container compressive strength)
A vertical load was applied to the container of Example 1. The compressive strength of the container was measured according to the conditions of 23 ° C., 50% RH and a compression speed of 50 mm / min. The results are shown in FIG.

(Evaluation of bottle bending)
Next, a vertical load of 400 N was applied to the container of Example 1. At this time, the amount of protrusion in the horizontal direction of the trunk at a height of 125 mm from below was measured. The results are shown in FIG.

(Evaluation when pallet stacking)
Put a container of water in a cardboard box (1.5 liters, 8 storage box) distributed in the market, and stack the boxes into 4 pallets (stack one by one alternately) into one pallet, and stack two pallets The bottle bending was evaluated using the bottles (n = 90) placed in the lowermost box. Specifically, after storing for 2 weeks at 30 ° C and 80% RH in the state of two pallets, take out a container with water from the cardboard box, observe the bottle with a CCD camera, and observe the tilt of the bottle. did. The results are shown in FIG. The degree of tilt of the bottle was measured by the amount of displacement at a height of 307 mm from the bottom of the container.

  In the same manner as in Example 1, evaluation of the compressive strength of the container, evaluation of bottle bending, and evaluation during pallet stacking were performed. The results are shown in FIGS. 7, 8, and 9, respectively.

(Comparative Example 1)
As Comparative Example 1, the shape of the container (1.5 liter) shown in FIGS. 10 and 11 was used. FIG. 10: is a general-view figure which shows the plastic container for square drinks of the comparative example 1, (a) is a left view, (b) is a front view, (c) shows a top view. FIG. 11 is a perspective view of the container shown in FIG. The container height was 307 mm, the trunk diameter was 90 × 77 mm, and the trunk thickness was 0.21 mm (the thickness distribution was 0.19 to 0.24 mm depending on the location, and the average thickness was 0.21 mm). . Out of the 12 annular ribs, the bottom 6 were transverse wave-shaped ribs. All the ribs provided on the body portion are transverse wave-shaped ribs. However, a downward crest is located at the center of the long side wall and the short side wall, and an upward crest is located at the center of the corner wall. The transverse wave-shaped rib width was 6.90 mm, the depth (U character groove) was 1.70 mm, and the depth (V character groove) was 2.50 mm. The horizontal annular (not transverse wave) rib provided on the label portion 3 had a width of 7.80 mm, a depth (U character groove) of 2.80 mm, and a depth (V character groove) of 3.70 mm. A grip portion is not provided at the boundary between the label portion 3 and the body portion 4. The amount of PET resin used was 38 g. This container was filled with 1.5 liters of water by aseptic filling and sealed with a lid.

  In the same manner as in Example 1, evaluation of the compressive strength of the container, evaluation of bottle bending, and evaluation during pallet stacking were performed. The results are shown in FIGS. 7, 8, and 9, respectively.

(Comparative Example 2)
As Comparative Example 2, the container (1.5 liter) shown in FIGS. 12 and 13 was used. 12A and 12B are schematic views showing a plastic container for a rectangular beverage of Comparative Example 2, wherein FIG. 12A is a left side view, FIG. 12B is a front view, and FIG. 12C is a plan view. FIG. 13 is a perspective view of the container shown in FIG. The container of Comparative Example 2 has a container height of 307 mm, a trunk diameter of 90 × 77 mm, a trunk thickness of 0.21 mm (depending on the location, there is a thickness distribution of 0.19 to 0.24 mm, and the average thickness is 0 .21 mm). All of the 11 annular ribs were horizontally annular (not transverse) ribs. The horizontal annular (not transverse wave) rib width was 7.80 mm, the depth (U character groove) was 2.80 mm, and the depth (V character groove) was 3.70 mm. Further, linear ribs 27 extending in the horizontal direction at the lower end of the body part 4 were formed on the long side wall and the short side wall, respectively. A grip portion 25 is provided at the boundary between the label portion 3 and the body portion 4. The amount of PET resin used was 38 g. This container was filled with 1.5 liters of water by aseptic filling and sealed with a lid.

  In the same manner as in Example 1, evaluation of the compressive strength of the container, evaluation of bottle bending, and evaluation during pallet stacking were performed. The results are shown in FIGS. 7, 8, and 9, respectively.

  According to the graph of FIG. 7, although the compressive strength of Example 1 was smaller than that of Comparative Example 1 and Comparative Example 2, it was confirmed that the compressive strength was practically sufficient. According to the graph of FIG. 8, the pop-out amount of Example 1 was smaller than that of Comparative Example 1 and Comparative Example 2, and it was confirmed that the deformation amount of the container was small. According to the graph of FIG. 9, Example 1 and Comparative Example 1 in which a transverse wave-shaped rib is provided are bent bottles as compared with Comparative Example 2 in which a horizontal annular rib is provided without a transverse wave-like rib. In particular, it was confirmed that the maximum bottle bending amount was reduced. And although the comparative example 1 has provided the transverse wave-shaped rib, since the downward crest part was located in the center of a long side wall and a short side wall, and the upward crest part was located in the center of a corner wall The maximum bottle bending amount was larger than that of Example 1, and both the average bottle bending amount and the minimum bottle bending amount were large.

100, 200, 300, 400 Square beverage plastic container 1 Mouth part 2 Shoulder part 3 Label part 4 Body part 5 Bottom part 6, 6a, 6b Long side wall 7, 7a, 7b Short side wall 8, 8a, 8b, 8c , 8d Corner wall 9, 9a, 9b Wave-like rib 10, 10a, 10b, 11, 11a, 11b Wave crest portion 12, 12a, 12b, 13, 13a, 13b, 14a, 14b Symmetrical point 15 Embossing portion for gripping 21b Upper wave crest portion 22b Lower wave crest portion 23 Annular rib 24a whose side surface circulates in a non-corrugated horizontal direction 24b A boundary between the short side wall and the corner wall 24b A boundary between the long side wall and the corner wall 25 A gripping part 26 Rib 27 provided in the part Linear rib 30 extending in the horizontal direction Rib lower edge 31 in the wave crest in the upper direction Rib upper edge X in the wave crest in the lower direction Vertical center line Y passing through the width center of the long side wall Short side The width of the wall Vertical center line passing through the width center of the vertical center line Z corner wall through the

Claims (6)

A corner having a mouth portion, a shoulder portion, a label portion, a trunk portion, and a bottom portion in order from the top, and the trunk portion connecting the long side wall, the short side wall, and the long side wall and the short side wall. A square beverage plastic container for filling non-carbonated beverages,
In the body portion, a transverse wave-shaped rib having a vertical direction as an amplitude direction is formed by arranging a plurality of ribs having the same shape so that the crest portions of the ribs are aligned vertically and rotating the side surface,
The transverse wave-shaped rib has a point-symmetric wave shape with an arbitrary point on a vertical center line passing through the center of the width of the long side wall of the body portion as a symmetry point, and the short side wall of the body portion It has a point-symmetric wave shape with an arbitrary point on the vertical center line passing through the width center as a symmetry point, and the rib formed on the long side wall and the rib formed on the short side wall are corner walls. A plastic container for rectangular beverages, which is connected in a state of maintaining a wave shape, and in which all the symmetry points are on the same horizontal plane.   The plastic container for rectangular beverages according to claim 1, wherein a point of symmetry of the transverse wave-shaped rib is located on a vertical center line passing through a width center of the corner wall.   The transverse wave-shaped rib has one upward crest and one downward crest per one of the long side walls, and one upward crest per one of the short side walls. The plastic container for square beverages according to claim 1 or 2, wherein each has one wave crest portion in the downward direction.   A plurality of annular ribs having side surfaces that circulate in the horizontal direction are formed side by side on the upper side of the body portion, and the transverse wave-shaped ribs are formed on the lower side. The plastic container for square drinks as described in any one of these.   The plastic container for a square beverage according to any one of claims 1 to 4, wherein the amplitude of the transverse wave-shaped rib is larger than the width of the rib.   A beverage product, wherein the square beverage plastic container according to any one of claims 1 to 5 is filled with a non-carbonated beverage.