JP6317097B2 - Plastic bottle - Google Patents

Description

  The present invention relates to a plastic bottle.

  Plastic bottles (hereinafter also simply referred to as “bottles”) are widely used as beverage bottles, and there is a demand for weight reduction. As a method for reducing the weight of the bottle, it is common to reduce the wall thickness. However, the reduction in thickness causes a decrease in the strength of the bottle at the same time. For this reason, when designing a bottle, it is required to balance the conflicting elements of weight reduction and strength maintenance.

  Conventionally, for example, a bottle described in Patent Document 1 is known as a bottle that achieves maximum weight reduction while ensuring strength. In this bottle, circumferential ribs having a circular cross-sectional shape are formed in a constricted portion having a substantially polygonal cross-sectional shape, and upper and lower non-constricted portions of the constricted portion are formed in a circular cross-sectional shape.

Patent No. 5118478

  In response to increasing awareness of resource saving in recent years, bottles that are maximally lightened as described above are required to be further lightened. However, as the weight and thickness are further reduced, even with a small force when the user holds the bottle, the bottle will quickly dent, giving the user the impression that it is difficult to hold the bottle. It is becoming difficult to meet the specifications (usability, bendability).

  In this background, the inventor who has designed and developed lightweight bottles can achieve both weight reduction and strength maintenance with just a general approach of providing peripheral ribs. I got the knowledge that there would be a limit.

  The present invention has been made on the basis of such knowledge, and an object thereof is to provide a plastic bottle that can be reduced in weight while ensuring strength suitable for usability by a completely different approach. That is.

  First, it is generally recognized that in the case of heavy and thick bottles, patterns such as bottle surface patterns and sculptures are only used to improve the appearance of the bottle and affect the strength of the bottle. That is not.

  On the other hand, in the case of a weight-reduced bottle, the present inventor obtained knowledge that even such a pattern affects the strength of the bottle. In addition, the present inventor feels that the bottle is easy to dent and difficult to hold when the bottle easily dents by 1 mm or more. If the rigidity up to 1 mm can be increased, the strength suitable for usability The knowledge that can be secured.

  Based on these findings, the present inventor has intensively studied, and as a result, by forming a block pattern having a certain regularity on the peripheral surface of the bottle, the initial rigidity of the bottle is improved and the bottle is easily made. The plastic bottle of the present invention, which can allow the user to experience an impression (a firm feeling) that does not fall and contribute to weight reduction, has been completed.

That is, the plastic bottle of the present invention includes a bottle peripheral surface, and a block pattern formed by combining a plurality of types of concave blocks in the vertical direction and the horizontal direction on the bottle peripheral surface, and the plurality of types of concave blocks are: At least one of the following (a) and (b), including at least one basic block, a plurality of vertically long blocks longer than the basic block, and a plurality of horizontally long blocks longer than the basic block It satisfies.
(A) The plurality of horizontally long blocks are arranged so as to be continuous in the vertical direction, and the horizontally long blocks adjacent to each other are displaced in the horizontal direction.
(B) The plurality of vertically long blocks are arranged so as to be continuous in the horizontal direction, and the vertically long blocks adjacent to each other are displaced in the vertical direction.

  In this way, by disposing the horizontally long block and / or vertically long block, the horizontal direction, the vertical direction, and the horizontal direction and the vertical direction can be compared with the case where the block pattern is not provided or the block pattern is simply composed of only the basic block. It is possible to more strongly resist initial deformation in at least one direction of the bending direction. As a result, the initial rigidity of the part where the block pattern is formed can be increased, so by forming the block pattern in a predetermined part of the bottle (part that the user is supposed to have), You can feel the impression that the bottle is not easily dented. Further, as a result of ensuring such initial rigidity, the bottle can be further reduced in weight.

  Preferably, the block pattern is formed in the circumferential direction on the peripheral surface of the bottle. This makes it possible for the user to hold the bottle from any direction and to hold the block pattern, and the force acting on the peripheral surface of the bottle when the user holds it is transmitted in the circumferential direction via the block pattern. Therefore, the above-mentioned firm feeling can be further experienced.

  Preferably, both (a) and (b) are satisfied. According to such a configuration, compared to the case where the block pattern is configured by only one of the basic block, the horizontally long block, and the vertically long block, the initial deformation in all directions of the horizontal direction, the vertical direction, and the bending direction is reduced. Can withstand more strongly. Therefore, the initial rigidity of the part where the block pattern is formed can be further increased.

  Preferably, the plurality of vertically long blocks may include vertically long blocks that are arranged on the left side and the right side of the horizontally long block and respectively extend toward one side and the other side in the vertical direction. Similarly, the plurality of horizontally long blocks may include horizontally long blocks that are respectively arranged on the upper side and the lower side of the vertically long blocks and extend toward one side and the other side in the horizontal direction.

  Preferably, on the peripheral surface of the bottle, at least two concave ribs are formed in the circumferential direction so as to be spaced apart from each other in the vertical direction, and the block pattern is formed between the at least two concave ribs. According to this configuration, the initial rigidity of the surface portion between the concave ribs can be improved by the block pattern.

  More preferably, a recess for inserting a finger is further formed on the peripheral surface of the bottle, and a part of the recess is formed in a vertical region between the at least two concave ribs. An area without a block and an area with a block formed by arranging only basic blocks in the horizontal direction below the area may be included. According to such a configuration, the basic block can be arranged even when a sufficient area for arranging the vertically long block cannot be secured by a part of the recess.

  In this case, the bottom of the recess is deformed so as to swell when a top load is applied to the plastic bottle, and the pressure is configured so that the deformation is restored when the top load is released. It has an absorption surface, and at least a part of the pressure absorption surface is preferably formed in a non-blocking region. According to such a configuration, since the initial rigidity is enhanced by the basic block in the block-attached area on the lower side of the pressure absorption surface, the pressure absorption surface that deforms when a top load is applied is more easily deformed.

A plastic bottle according to another embodiment of the present invention includes a bottle peripheral surface, and a block pattern formed in a circumferential direction on the bottle peripheral surface and formed by combining a plurality of types of concave blocks in the vertical direction and the horizontal direction, The plurality of types of concave blocks include at least one basic block, at least one vertical block that is longer in the vertical direction than the basic block, and a plurality of horizontal blocks that are longer in the horizontal direction than the basic block. The blocks are arranged such that horizontally long blocks that are adjacent to each other and are arranged in a row in the vertical direction are displaced in the horizontal direction.

According to still another embodiment of the present invention, a plastic bottle includes a bottle peripheral surface, and a block pattern formed in a circumferential direction on the bottle peripheral surface and formed by combining a plurality of types of concave blocks in the vertical direction and the horizontal direction. The plurality of types of concave blocks include at least one basic block, a plurality of vertically long blocks longer than the basic block, and at least one horizontally long block longer than the basic block. In the block, vertically long blocks that are adjacent to each other and are arranged in a row in the horizontal direction are displaced in the vertical direction.

It is a figure which shows the surface pattern which concerns on the comparative example different from the block pattern which concerns on this embodiment, (a) is a surface pattern which formed the rib along the vertical direction, (b) and (c) are (a) It is a figure which shows that the surface pattern of () is weak in a horizontal direction and a bending direction. It is a figure which shows the surface pattern which concerns on the comparative example different from the block pattern which concerns on this embodiment, (a) is a surface pattern which formed the rib along a horizontal direction, (b) and (c) are (a It is a figure which shows that the surface pattern of () is weak in a vertical direction and a bending direction. It is a figure which shows the surface pattern which concerns on the comparative example different from the block pattern which concerns on this embodiment, (a) is a surface pattern which arranged the block in the grid | lattice form in the vertical direction and the horizontal direction, (b) and (c (A) is a figure which shows that the surface pattern of (a) is weak in a bending direction. It is a figure which shows the block pattern which concerns on this embodiment, (a) is a perspective view of a block pattern, (b) is an expansion perspective view of a basic block, (c) is an expansion perspective view of a horizontally long block. It is a figure explaining the regularity of arrangement | positioning of the horizontal block and vertical block in the block pattern which concerns on this embodiment, (a) is a perspective view, (b) is the elements on larger scale of (a). (A), (b), and (c) are figures which show another block pattern with the same regularity as the block pattern which concerns on this embodiment, respectively. It is a figure which shows the block pattern which concerns on the 1st modification of this embodiment, (a) is a perspective view of a block pattern, (b) is an enlarged perspective view of a basic block, (c) is an enlarged perspective view of a horizontally long block It is. It is a figure which shows the block pattern which concerns on the 2nd modification of this embodiment, (a) is a perspective view of a block pattern, (b) is an enlarged perspective view of a basic block, (c) is an enlarged perspective view of a horizontally long block It is. It is a figure which shows the block pattern which concerns on the 3rd modification of this embodiment, (a) is a perspective view of a block pattern, (b) is an enlarged perspective view of a basic block, (c) is an enlarged perspective view of a horizontally long block It is. It is a perspective view which shows the block pattern which concerns on the 4th modification of this embodiment. It is a figure which shows the block pattern which concerns on the 5th modification of this embodiment, (a) is a perspective view of a block pattern, (b) is an enlarged perspective view of a basic block, (c) is an enlarged perspective view of a horizontally long block It is. It is a figure which shows the block pattern which concerns on the 6th modification of this embodiment, (a) is a perspective view of a block pattern, (b) is an enlarged perspective view of a basic block, (c) is an enlarged perspective view of a horizontally long block It is. It is a figure which shows the block pattern which concerns on the 7th modification of this embodiment, (a) is a perspective view of a block pattern, (b) is an enlarged perspective view of a basic block, (c) is an enlarged perspective view of a horizontally long block It is. It is a figure which shows the block pattern which concerns on the 8th modification of this embodiment, (a) is a perspective view of a block pattern, (b) is an enlarged perspective view of a basic block, (c) is an enlarged perspective view of a horizontally long block It is. It is a front view which shows the plastic bottle which concerns on this embodiment in gray scale. It is the right view which shows the plastic bottle of FIG. 15 with a diagram, and is the figure which looked at the plastic bottle of FIG. (A) is a figure which shows the experimental condition performed about the plastic bottle of FIG. 15, (b) is a figure which shows the two measurement locations in the said experiment. It is a graph which shows the experimental result done about the plastic bottle of FIG. 15, and the plastic bottle which concerns on a comparative example. It is a figure which shows the result of the numerical analysis performed about the plastic bottle of FIG. 15, and the plastic bottle which concerns on a comparative example, and is a side view which shows the state of a deformation | transformation initial stage. It is a perspective view of the plastic bottle which concerns on another embodiment. It is a front view of the plastic bottle of FIG. (A) is an enlarged front view which shows the constriction part periphery of the plastic bottle which concerns on a comparative example, (b) is an enlarged front view which shows the constriction part periphery of the plastic bottle of FIG. It is a graph which shows the experimental result conducted about the plastic bottle of FIG. 20, and the plastic bottle which concerns on a comparative example.

Preferred embodiments of the present invention will be described with reference to the accompanying drawings.
Below, a block pattern is demonstrated first and then the plastic bottle to which the block pattern is applied will be described. In the following description, the direction where the bottle mouth is present is referred to as the upper side, and the direction where the bottle bottom is present is referred to as the lower side. A cross-sectional shape means a cross-sectional shape in a plane orthogonal to the central axis of the bottle.

1. In general, as a technique for increasing the strength of the surface of an object with respect to the block pattern, as shown in FIG. 1A or 2A, a plurality of ribs 200, 202 along the vertical direction or the horizontal direction are provided on the surfaces 210, 220. It is known to form. The surface 210 shown in FIG. 1 (a) is strong in the vertical direction, but is weak against the force in the lateral direction and the bending direction as shown in FIGS. 1 (b) and (c). . Similarly, the surface 220 shown in FIG. 2 (a) is strong in the lateral direction, but as shown in FIGS. 2 (b) and 2 (c), it is resistant to forces in the vertical direction and bending direction. Becomes weaker.

  The surface 230 shown in FIG. 3 (a) is a combination of the surface patterns shown in FIG. 1 (a) and FIG. 2 (a). According to this, for the forces in the vertical and horizontal directions, Become stronger. However, as shown in FIGS. 3 (b) and 3 (c), the surface pattern shown in FIG. 3 (a) still remains weak against forces in the bending direction. This is because the respective ridge lines 240 and 250 extending in the vertical direction and the horizontal direction extend linearly as one line.

  FIG. 4 is a diagram showing a block pattern 300 of the present embodiment. As shown in FIG. 4A, in the block pattern 300, the ridge lines 240 and 250 as shown in FIG. 3A are divided at some points in one direction. And so that it may become such a divided mode, block pattern 300 is constituted by combining three different concave blocks 310, 320, 330 in the vertical direction and the horizontal direction. The concave blocks 310, 320, and 330 are concave designs that can be regarded as patterns, decorations, or sculptures that are concavely formed on the bottle surface.

  Specifically, the three different concave blocks in the block pattern 300 are composed of a basic block 310, a vertically long block 320 that is longer in the vertical direction than the basic block 310, and a horizontally long block 330 that is longer in the horizontal direction than the basic block. Has been. As shown in FIG. 4B, the basic block 310 has a regular quadrangular pyramid shape and has four triangular slopes. As shown in FIG. 4C, the horizontally long block 330 has a quadrangular pyramid shape having a rectangular bottom surface obtained by extending the regular rectangular bottom surface of the basic block 310 in the horizontal direction by the same length as one side of the regular square. More specifically, the lateral slopes 350 and 352 of the horizontally long block 330 have the same triangular shape as that of the basic block 310, and the longitudinal slopes 354 and 356 of the horizontally long block 330 have a trapezoidal shape. The vertically long block 320 is configured in the same shape as the horizontally long block 330 except that its longitudinal direction is 90 ° different from that of the horizontally long block 330.

  In the block pattern 300, a vertically long block 320 and a horizontally long block 330 are arranged with a certain regularity.

  Specifically, as shown in FIG. 5A, the plurality of vertically long blocks 320 are arranged so that the vertically long blocks 320a and 320b that are adjacent to each other in the horizontal direction are displaced in the vertical direction. Yes. That is, two vertically long blocks 320a and 320b arranged so as to be continuous with each other in the horizontal direction are arranged in a staircase pattern. In this case, it is preferable that the left vertical block 320a is displaced to one side (lower side) in the vertical direction with respect to the right vertical block 320b. The plurality of vertically long blocks 320 include vertically long blocks 320c and 320d that are respectively arranged on the right and left sides of the horizontally long block 330 and extend toward one side (lower side) and the other side (upper side) in the vertical direction. It is preferable that

  As shown in FIG. 5A, the plurality of horizontally long blocks 330 are arranged such that the horizontally long blocks 330a and 330b adjacent to each other in the vertical direction are displaced in the horizontal direction. That is, the two horizontally long blocks 330a and 330b arranged so as to be continuous with each other in the vertical direction are arranged stepwise. In this case, it is preferable that the upper horizontally long block 330a is displaced to one side (right side) in the horizontal direction with respect to the lower horizontally long block 330b. Further, the plurality of horizontally long blocks 330 include horizontally long blocks 330c and 330d that are respectively disposed below and above the vertically long block 320 and extend toward one side (right side) and the other side (left side) in the horizontal direction. It is preferred that

  The basic block 310 is arranged in an area that cannot be covered by the combination of the vertically long block 320 and the horizontally long block 330, such as the left corner area shown in FIG.

  As a result, as shown in FIG. 5B, in the block pattern 300, the ridge line 360 continuous in the vertical direction has a length corresponding to three of the basic blocks 310 at the longest. That is, the center portion of the horizontally long block 330 is located at both ends in the longitudinal direction of the ridge line 360 having the length of three so that the ridge line 360 is cut. Similarly, the ridge lines 362 continuous in the horizontal direction have a length corresponding to three of the basic blocks 310 at the longest, and the ridge lines 362 are respectively provided at both ends in the horizontal direction of the three ridge lines 362 in the horizontal direction. The central portion of the vertically long block 320 is positioned so as to be a break. In this manner, in the block pattern 300, the ridge lines 240 and 250 as shown in FIG. 3A are divided at various points in one direction.

  FIG. 6 is a diagram showing another block pattern having the same regularity as the block pattern 300 of FIG. A block pattern 300a in FIG. 6A is obtained by shortening the block pattern 300 in FIG. 5A in the vertical direction and lengthening it in the horizontal direction. The block pattern 300b in FIG. 6B is a symmetrical pattern with the block pattern 300a in FIG. In the block pattern 300c of FIG. 6C, the ridge lines 360c and 362c continuous in the vertical direction and the horizontal direction have a length corresponding to four of the basic blocks 310 at the longest. That is, the center portions of the horizontally long block 330 and the vertically long block 320 are positioned at both ends in the longitudinal direction and the lateral direction of the four ridge lines 360c and 362c so that the ridge lines 360c and 362c are cut off, respectively. doing. A basic block 310 is located in an inner region surrounded by the two vertically long blocks 320 and the two horizontally long blocks 330. In any of the block patterns 300a, 300b, and 300c shown in FIG. 6, the regularity of the arrangement of the vertically long blocks 320 and the horizontally long blocks 330 described above is ensured. For example, the vertically long blocks 320 and 320 that are adjacent to each other in the horizontal direction are displaced in the vertical direction. Further, the horizontally long blocks 330 and 330 that are adjacent to each other in the vertical direction are displaced in the horizontal direction.

  Here, as long as the above-described regularity in the block pattern 300 is maintained, the basic block 310, the vertically long block 320, and the horizontally long block 330 can have appropriate shapes. Hereinafter, with reference to FIGS. 7-14, it demonstrates centering around difference with said block pattern 300. FIG.

  In the block pattern 300d shown in FIG. 7, the slope of the basic block 310d is a curved surface. Similarly, each of the vertically long blocks 320d and the horizontally long blocks 330d has a curved surface.

  In the block pattern 300e shown in FIG. 8, the basic block 310e has a conical shape, the horizontally long block 330e has both sides in the horizontal direction constituted by half of the basic block 310e, and the middle portion in the horizontal direction has a rectangular slope. Yes. The vertically long block 320e is obtained by rotating the horizontally long block 330e by 90 degrees.

  In the block pattern 300f shown in FIG. 9, the basic block 310f, the vertically long block 320f, and the horizontally long block 330f are curved surfaces of the basic block 310e, the vertically long block 320e, and the horizontally long block 330e in the block pattern 300e shown in FIG. It consists of

  A block pattern 300g shown in FIG. 10 is a combination of the basic block 310e shown in FIG. 8 and the vertically long block 320 and horizontally long block 330 shown in FIG. As described above, it is possible to configure one block pattern using a vertically long block and a horizontally long block having a shape not based on the shape of the basic block, and the combination of these concave blocks is arbitrary. In this case, it goes without saying that the vertically long block and the horizontally long block may be formed of different shapes.

  Block patterns 300h to 300k shown in FIGS. 11 to 14 are formed by forming a basic block, a vertically long block, and a horizontally long block with trapezoidal cones.

  In the block pattern 300h shown in FIG. 11, the basic block 310h has a quadrangular pyramid shape, and four trapezoidal inclined surfaces are connected to the periphery of the square top surface. In addition, the horizontally long block 330h has a top surface that is longer in the horizontal direction than the basic block 310h. The vertically long block 320h is obtained by rotating the direction of the horizontally long block 330h by 90 degrees.

  In the block pattern 300i shown in FIG. 12, the basic block 310i, the vertically long block 320i, and the horizontally long block 330i are curved surfaces on the slopes of the basic block 310h, the vertically long block 320h, and the horizontally long block 330h in the block pattern 300h shown in FIG. It consists of

  In the block pattern 300j shown in FIG. 13, the basic block 310j has a truncated cone shape, and a cylindrical inclined surface is connected to the periphery of the circular top surface. In the horizontally long block 330j, the top surface of the horizontally long block is formed as a horizontally long ellipse, and both sides in the lateral direction are constituted by half portions of the basic block 310j. The vertically long block 320j is obtained by rotating the direction of the horizontally long block 330j by 90 degrees.

  In the block pattern 300k shown in FIG. 14, the basic block 310k, the vertically long block 320k, and the horizontally long block 330k are curved surfaces of the basic blocks 310j, vertically long blocks 320j, and horizontally long blocks 330j in the block pattern 300j shown in FIG. It consists of

  Here, when applying the block pattern, the configuration of the block pattern is determined from the viewpoint of the shape, specifications, strength, etc. of the plastic bottle and the size of the area where the block pattern is arranged. Thus, it may be determined as appropriate. At this time, the basic blocks, the vertically long blocks, and the horizontally long blocks in the block patterns 300 and 300a to h described above may be appropriately combined with each other. In the following, a plastic bottle employing the block pattern 300 shown in FIG. 4 will be described as an example.

2. As shown in FIGS. 15 and 16, the plastic bottle 1 (hereinafter referred to as “bottle 1”) has a mouth portion 2, a shoulder portion 3, a trunk portion 4 and a bottom portion 5 in order from the upper side. These parts (2, 3, 4 and 5) are integrally formed and constitute a bottomed cylindrical bottle wall for storing a drink inside. As a beverage, it is suitable for storing non-carbonated beverages such as water, green tea, oolong tea, blended tea, sports drink or fruit juice. Here, the full capacity of the bottle 1 is about 570 ml, but the capacity is not limited to this.

The bottle 1 is molded by a stretch molding method such as biaxial stretch blow molding using, for example, a thermoplastic resin such as polyethylene, polypropylene, or polyethylene terephthalate as a main material.
An example of the manufacturing process of the bottle 1 will be described. First, a thermoplastic resin is injected into a mold, and a preform is injection molded. The preform is composed of a mouth portion having the same shape as the mouth portion 2 and a bottomed cylindrical portion continuous to the lower side thereof. After injection molding, the preform is set on a blow molding machine and the tubular portion of the preform is heated. And while extending a cylindrical part to a vertical direction with an extending | stretching rod, compressed air is blown and a cylindrical part is extended to a horizontal direction. The stretched cylindrical portion is pressed against the inner surface of the mold and then solidified. Thereby, the shoulder part 3, the trunk | drum 4, and the bottom part 5 are shape | molded, and a series of shaping | molding of the bottle 1 is completed.

  The mouth part 2 is open at the upper end and functions as a beverage spout. The opening of the mouth 2 is opened and closed by a cap 2a. The shoulder 3 has a circular cross-sectional shape that gradually expands downward, and connects the mouth 2 having the smallest diameter in the bottle 1 to the upper end of the body 4 that forms the maximum width in the bottle 1. The bottom 5 is composed of a bottom wall 21 and a peripheral wall 22. The peripheral wall 22 is a cylindrical portion that rises upward from the peripheral edge of the bottom wall 21, and is slightly recessed downward to connect the lower end of the body portion 4 to the bottom wall 21.

  The trunk 4 extends in the vertical direction between the shoulder 3 and the bottom 5. The body portion 4 includes a constricted portion 41 and non-constricted portions 42 and 43 that are continuous above and below the constricted portion 41. The constricted part 41 is located below the center of gravity of the bottle 1 when the beverage is fully filled. The constricted portion 41 has a polygonal cross-sectional shape having a substantially dodecagonal shape, and the cross-sectional shape gradually changes in the vertical direction. A concave rib 51 having a circular cross section is formed at the center of the constricted portion 41 in the vertical direction. In addition, concave ribs 52 and 53 having a circular cross-sectional shape are formed in the upper portion and the lower portion (both of which are polygonal cross-sectional shape portions) of the constricted portion 41, respectively. Further, a plurality of concave ribs 11, 12, 13, 14, 15 are formed in the upper non-constricted portion 43 in the circumferential direction, and a plurality of concave ribs 16 are formed in the lower non-constricted portion 42. , 17 and 18 are formed in the circumferential direction. The strength (especially the lateral strength) of the bottle 1 is reinforced by the concave ribs 51 to 53 and 11 to 18 which are spaced apart from each other in the vertical direction. The concave rib 11 is located at the boundary between the shoulder 3 and the trunk 4, and the concave rib 18 is located at the boundary between the trunk 4 and the bottom 5.

  The bottle 1 is provided with four block patterns 400, 401, 402, and 403.

  The block pattern 400 is formed on the lower peripheral surface of the shoulder 3 in the circumferential direction. In the block pattern 400, a maximum of two horizontally long blocks are arranged in the vertical direction, and the regularity of the above horizontally long blocks 330 is ensured for the arrangement. That is, with respect to the horizontally long blocks 430a and 430b that are adjacent to each other in the vertical direction, the upper horizontally long block 430a is displaced to one side (left side) in the horizontal direction with respect to the lower horizontally long block 430b. In this case, a vertically long block 420 extending downward is arranged on the left side of the upper horizontally long block 430a, and a vertically long block 420 extending upward is arranged on the right side of the lower horizontally long block 430b. Yes. A basic block 410 is arranged in an area between the two horizontally long blocks 430 a and 430 b and one vertically long block 420.

  The block pattern 401 is formed in the circumferential direction on the bottle peripheral surface between the concave rib 15 and the concave rib 52. The block pattern 401 has a maximum of three horizontally long blocks arranged in the vertical direction, and the regularity of the horizontally long blocks 330 and the vertically long blocks 320 described above is secured. That is, with respect to the horizontally long blocks 430a and 430b that are adjacent to each other in the vertical direction, the upper horizontally long block 430a is displaced to one side (left side) in the horizontal direction with respect to the lower horizontally long block 430b. Further, regarding the vertically long blocks 420a and 420b that are adjacent to each other in the horizontal direction, the left vertical block 420a is displaced to one side (upper side) in the vertical direction with respect to the right vertical block 420b. Further, the plurality of vertically long blocks include vertically long blocks 420c and 420d that are respectively arranged on the left and right sides of the central horizontally long block 430c and extend toward one side (lower side) and the other side (upper side) in the vertical direction. include. A basic block 410 is arranged in an area between the two horizontally long blocks 430 a and 430 b and one vertically long block 420.

  The block pattern 402 is formed on the peripheral surface of the bottle between the concave rib 53 and the concave rib 16 in the circumferential direction. The block pattern 402 has a maximum of four horizontally long blocks arranged in the vertical direction, and the regularity of the horizontally long blocks 330 and the vertically long blocks 320 described above is secured. In particular, in the block pattern 402, a plurality of horizontally long blocks are arranged on the lower side and the upper side of the central vertically long block 420 as compared with the block pattern 401, respectively, and one side (left side) and the other side (right side) in the horizontal direction. ) Is added with a point including horizontally long blocks 430c and 430d extending toward).

  The block pattern 403 is formed in the circumferential direction on the bottle peripheral surface between the concave rib 17 and the concave rib 18. The block pattern 403 is the same as the block pattern 400 except that the position shift directions of the horizontally long blocks 430a and 430b are opposite directions.

  Then, with reference to FIGS. 17-19, the experiment and analysis which were performed about the bottle 1 and the bottle which concerns on a comparative example are demonstrated. The bottle according to the comparative example has the same structure as the bottle 1 except that it does not have the block patterns 400, 401, 402, and 403.

  As shown in FIG. 17A, in the experiment, a lateral load F (load in a direction perpendicular to the vertical direction) was applied to the block pattern 402 in a state where the bottle 1 was placed sideways on the desk. In this case, as shown in FIG. 17B, the amount of displacement of the bottle 1 (the amount of displacement in the direction perpendicular to the vertical direction) was measured at two measurement locations 500 and 502 of the block pattern 402. The measurement location 500 is a location located immediately below a location corresponding to one long side of the polygonal cross-sectional shape of the constricted portion 40 between the concave ribs 52 and 53, and the measurement location 502 is the polygonal cross-section. It is a location located directly below a location corresponding to one short side of the shape. In addition, the same experiment was performed on the bottle according to the comparative example at the same measurement location as the bottle 1.

FIG. 18 is a graph showing the results of the above experiment. The vertical axis indicates the strength due to the lateral load F, and the horizontal axis indicates the amount of displacement of the bottle 1.
As shown in FIG. 18, it can be seen that the strength of the bottle according to the comparative example varies depending on the measurement points 500 and 502. This seems to be due to the influence of the polygonal cross-sectional shape in the constricted portion 40. As described above, the bottle according to the comparative example has a different deformation amount depending on the portion to be pressed, and is easily deformed into an elliptical shape at the time of deformation. This means that the user can easily recognize that the bottle is easily deformed. It also means that there is room for improvement in vending machine characteristics (bendability).

  On the other hand, in the bottle 1 according to this embodiment, it can be seen that there is no difference in strength due to the measurement locations 500 and 502. That is, the bottle 1 is not affected by the polygonal cross-sectional shape in the constricted portion 40. Thus, the amount of deformation of the bottle 1 does not differ depending on the location where it is pressed, and the bottle 1 is stable when trying to maintain a perfect circle during deformation. This means that it is easy for the user to recognize that the bottle is difficult to deform. It also means that a perfect circle that is appropriate and important for vending machine characteristics can be maintained.

  In addition, as described above, the user feels that the bottle is easily dented when the bottle is easily dented by 1 mm or more. If the strength in the region up to 1 mm is high, the user is a soft bottle. Nevertheless, it is easy to recognize that the bottle is hard to deform or has rigidity. In this regard, when both data up to the displacement amount of 1 mm are compared, the bottle 1 according to the embodiment has higher strength than the bottle according to the comparative example. For this reason, about the bottle 1 which concerns on embodiment, it is a thing which makes a user easily experience the impression (firm feeling) which does not dent easily. That is, the bottle 1 according to the embodiment can ensure strength suitable for usability.

  FIG. 19 is a diagram illustrating the results of numerical analysis regarding deformation and stress when the lateral load F is applied to the position of the measurement location 500 for the bottle 1 according to the present embodiment and the bottle 1 ′ according to the comparative example. . Here, a numerical analysis model of both bottles 1 and 1 ′ is created by a general-purpose program, and a structural analysis using FEM is performed, so that deformation and stress generated in both bottles 1 and 1 ′ in a state of being placed sideways on a desk. Evaluated.

  According to this, compared with the bottle 1 ′ according to the comparative example shown in FIG. 19B, the stress distribution in the bottle 1 according to the embodiment shown in FIG. You can see how the surrounding area is small. This is because the block pattern 402 is formed with the above-described regularity, and is more resistant to initial deformation in all directions in the horizontal direction, the vertical direction, and the bending direction than when the block pattern 402 is not provided. It is thought that this is caused by the fact that Thereby, it turns out that the initial stage rigidity is improving the bottle 1 which concerns on embodiment.

  As described above, according to the bottle 1 according to the present embodiment, since the predetermined block patterns 400, 401, 402, and 403 are formed on the bottle surface, the initial rigidity of the portion where the block pattern is formed is increased. Can be increased. In particular, the block patterns 402 and 403 are located in the middle of the bottle 1 in the vertical direction or below the center of gravity of the bottle 1 when the beverage is fully filled, and the portion that the user grips when holding the bottle 1 Become. For this reason, the user holding the block patterns 402 and 403 can experience an impression (a firm feeling) that the bottle 1 does not easily dent. Moreover, as a result of ensuring such initial rigidity, the bottle 1 can be further reduced in weight.

  In addition, as long as the block pattern formed on the bottle surface has the regularity described above, the design can be changed as appropriate. For example, the block pattern 402 of the trunk 4 can be adopted for the block pattern 400 of the shoulder 3, and vice versa. However, as long as the vertical space (area between the two concave ribs) in which the block pattern can be arranged can be sufficiently secured, it is better to adopt the block pattern 402 that is longer in the vertical direction than the block pattern 400 that is shorter in the vertical direction. This is advantageous in terms of initial rigidity.

  The depth of the basic block 310, the vertically long block 320, and the horizontally long block 330 in the block pattern formed on the bottle surface can be appropriately designed within a range of, for example, 0.3 to 1.3 mm. The initial rigidity can be increased compared to the shallow case. In addition, the vertical width Wh and the horizontal width Wv (refer to FIG. 4B) between the basic block 310, the vertically long block 320, and the horizontally long block 330 in the block pattern are, for example, in the range of 0.3 to 1.3 mm. The initial rigidity can be increased as compared with the case where the shorter one is longer than the longer one.

  Next, a plastic bottle 600 according to another embodiment (hereinafter referred to as “bottle 600”) will be described with reference to FIGS. The bottle 600 is suitable for a large-sized bottle having a capacity exceeding 1 liter, and is used for 2 liters here.

  Similar to the bottle 1, the bottle 600 includes a mouth portion 602, a shoulder portion 603, a trunk portion 604, and a bottom portion 605 in order from the upper side. The mouth 602 is opened and closed by a cap 602a. The shoulder portion 603 gradually expands in cross section downward, and connects the mouth portion 602 and the trunk portion 604. The bottom portion 605 includes a bottom wall 621 and a peripheral wall 622.

  The body portion 604 is a rectangular tube-shaped portion having a square cross-sectional shape as a base tone. Specifically, in the square cross-sectional shape of the body portion 604, four corners of the square are arcs, and straight portions are provided between adjacent corners. In addition, the body 604 has a constricted portion 640 in the middle of the vertical direction, and a finger insertion recess 680 at a position one step deeper than the constricted portion 640. When the body 604 is divided into three areas in the vertical direction, the body 604 includes a constricted portion 640, an upper body 642 above the constricted portion 640, and a lower body 644 below the constricted portion 640. And consist of The constricted portion 640 includes a pinch portion 660 that is most narrowed in the body portion 604, an upper inclined portion 662 that connects the pinch portion 660 to the upper body portion 642, and a lower inclined portion that connects the pinch portion 660 to the lower body portion 644. 664. The upper body portion 642 and the lower body portion 644 are portions having a constant square cross-sectional shape in the vertical direction. A plurality of concave ribs 650 and 652 are formed in the circumferential direction on the upper body 642 and the lower body 644, respectively.

  The recess 680 is formed on each of the four surfaces (straight portions) in the square cross section of the body 604 so as to be symmetric in the front-rear direction and in the left-right direction. The height of the dent 680 is longer than the width, and is high enough to allow, for example, two to three fingers to be inserted vertically by an adult user. The recessed portion 680 has an upper bottom surface 682 extending in parallel with the vertical direction and a lower bottom surface 684 inclined outward in the downward direction. The constricted portion 640 includes a concave rib 654 that crosses the upper portion of the upper bottom surface 682, a concave rib 655 that is divided at the center of the upper bottom surface 682, and a boundary between the upper bottom surface 682 and the lower bottom surface 684. A concave rib 656 that crosses the position and a concave rib 657 in which the rib portion is divided at the center position of the lower bottom surface 684 are formed. By using the divided concave ribs 655 and 657, the upper bottom surface 682 and the lower bottom surface 684 of the recess 680 are deformed so as to swell when a top load of a predetermined value or more is applied to the bottle 1. And when the top load is released, it functions as a pressure absorbing surface configured to return to its original deformation.

  The block pattern 700 is formed on the bottle peripheral surface between the concave rib 657 and the concave rib 652 in the circumferential direction. The position of the block pattern 700 is below the center of the bottle 600 in the vertical direction or below the center of gravity of the bottle 600 when the beverage is fully poured. The block pattern 700 adopts the block pattern 300 shown in FIG. Specifically, the block pattern 700 has a maximum of three horizontally long blocks arranged in the vertical direction, and the regularity of the horizontally long blocks 330 and the vertically long blocks 320 described above is secured.

  That is, as shown in FIG. 22B, with respect to the horizontally long blocks 730a and 730b that are adjacent to each other in the vertical direction, the upper horizontally long block 730a is positioned on one side in the horizontal direction with respect to the lower horizontally long block 730b. Misaligned to the other side. Further, regarding the vertically long blocks 720a and 720b that are adjacent to each other in the horizontal direction, the left vertical block 720a is displaced to one side or the other side in the vertical direction with respect to the right vertical block 720b. Further, the plurality of vertically long blocks include vertically long blocks 720c and 720d that are respectively disposed on the right and left sides of the central horizontally long block 730c and extend toward one side and the other side in the vertical direction.

  However, the block pattern 700 also includes horizontally long blocks 730f and 730f that are adjacent to each other in the horizontal direction. The block pattern 700 also includes a pattern in which a plurality of basic blocks 710 are arranged in the horizontal direction. In other words, in a vertical region between the two concave ribs 657 and 652 where the block pattern 700 is arranged, a non-block region 800 in which a part of the recess 680 is formed, and a non-block region 800 On the lower side, there is a block presence area 810 in which only basic blocks 710 are arranged in the horizontal direction. A lower bottom surface 684 of the depression 680 is formed in the non-blocking region 800.

  FIG. 22A shows a bottle 600 ′ according to a comparative example, and this bottle 600 ′ has the same structure as the bottle 600 except that it does not have the block pattern 700. For both bottles 600 and 600 ', an experiment was performed in which a top load (vertical compressive load) was applied in the direction indicated by the arrow F (vertically downward). In this experiment, six bottles 600 filled with beverages were packed in a cardboard box, and a top load was applied to the upper surface of the cap. Also, the bottle 600 'was similarly packed in a cardboard box and a top load was applied.

  FIG. 23 is a graph showing the results of the above experiment. The vertical axis represents the buckling strength, and the horizontal axis represents the amount of displacement of the bottle 1 in the vertical direction. As shown in FIG. 23, the bottle 600 ′ according to the comparative example seems to have a high absolute value of the buckling strength at first glance, but the peak P1 occurring at the initial stage is clear. This means that the bottle 600 ′ is easily deformed. On the other hand, although the bottle 600 according to the embodiment starts buckling with a force smaller than that of the bottle 600 ′, the peak is difficult to appear, and the peak P2 occurs later than the bottle 600 ′. This is because the strength of the bottle 600 is increased by the block pattern 700, so that the pressure absorbing surfaces (the upper bottom surface 682 and the lower bottom surface 684 of the recess 680) that operate under the top load are bottles than the bottle 600 ′. It seems that 600 is easier to move.

  Also, the deformation amount of the lower cardboard box when the cardboard boxes filled with the bottles 600 are stacked in two stages and the deformation amount of the cardboard box lower when the cardboard boxes packed with the bottles 600 ′ are loaded in two stages are measured. did. As a result, in the former, the displacement in the height direction was 11.5 mm and the bulge of the body portion 604 was 10 mm, whereas in the latter, the displacement in the height direction was 14 mm and the bulge of the body portion 604 was 13 mm. Met. That is, it was confirmed that the bottle 600 according to the embodiment has a smaller deformation amount of the cardboard box and a better result. If the cardboard box swells greatly, the cardboard box collapses in the worst case, which hinders transportation and storage.

  According to the bottle 600 according to the present embodiment described above, the block pattern 700 is formed on the bottle surface, which is effective for top load. Although not described in detail, as in the case of the bottle 1, the initial rigidity of the portion where the block pattern 700 is formed can be increased in the bottle 600. In particular, since the position of the block pattern 700 is directly below the constricted portion 640 and in the vicinity of the recessed portion 680, the block pattern 700 is a portion to which a palm is attached when the user holds the bottle 600. For this reason, the user can experience an impression (a firm feeling) that the bottle 1 is not easily recessed. Further, as a result of ensuring such initial rigidity, the bottle 600 can be further reduced in weight.

  In addition, as long as the block pattern formed on the bottle surface has the regularity described above, the design can be changed as appropriate. For example, the above-described block patterns 400, 401, 402, and 403 can also be used in the bottle 600 of the present embodiment.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In other words, those specific examples that have been appropriately modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. For example, the elements included in each of the specific examples described above and their arrangement, materials, conditions, shapes, sizes, and the like are not limited to those illustrated, but can be changed as appropriate. For example, the bottle may satisfy at least one of the above-described regularity of the vertically long block and the horizontally long block in the block pattern. Further, the cross-sectional shape of the body 604 may be a rectangle. Furthermore, the block pattern can be formed not in the circumferential direction but in the vertical direction on the peripheral surface of the bottle. For example, in the case of a flat bottle whose depth is smaller than the width, block patterns may be formed in the vertical direction on both sides in the depth direction of the bottle peripheral surface. Further, the plurality of types of concave blocks in the block pattern are not limited to three types, and the horizontal blocks and the vertical blocks may have a length in the longitudinal direction that is twice or more the length of the basic block. Moreover, each element with which each embodiment mentioned above is provided can be combined as long as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

1,600: Bottle,
300, 300a to 300k, 400 to 403, 700: block pattern,
310, 310d-k, 410, 710: Basic blocks 320, 320a-k, 420a-d, 720a-d: Vertical blocks 330, 330a-k, 430a-d, 730a-c, 730f: Horizontal blocks 11-18, 51-53, 650, 652, 654-657: concave rib 680: depression, 682: upper bottom surface (pressure absorbing surface), 684: lower bottom surface (pressure absorbing surface), 800: no rib region, 810: Ribbed area

Claims (10)

The bottle surface,
A block pattern formed on the peripheral surface of the bottle and formed by combining a plurality of types of concave blocks in the vertical direction and the horizontal direction, and
The plurality of types of concave blocks include at least one basic block, a plurality of vertically long blocks longer than the basic blocks, and a plurality of horizontally long blocks longer than the basic blocks.
A plastic bottle satisfying at least one of the following (a) and (b).
(A) The plurality of horizontally long blocks are arranged so as to be continuous in the vertical direction, and the horizontally long blocks adjacent to each other are displaced in the horizontal direction.
(B) The plurality of vertically long blocks are arranged so as to be continuous in the horizontal direction, and the vertically long blocks adjacent to each other are displaced in the vertical direction.   The plastic block according to claim 1, wherein the block pattern is formed in a circumferential direction on the peripheral surface of the bottle.   The plastic bottle according to claim 1 or 2, which satisfies both (a) and (b).   4. The plastic bottle according to claim 3, wherein the plurality of vertically long blocks include vertically long blocks that are respectively disposed on the left side and the right side of the horizontally long block and extend toward one side and the other side in the vertical direction.   5. The plastic bottle according to claim 3, wherein the plurality of horizontally long blocks include horizontally long blocks that are respectively disposed on an upper side and a lower side of the vertically long block and extend toward one side and the other side in the horizontal direction. On the peripheral surface of the bottle, at least two concave ribs are formed in the circumferential direction apart from each other in the vertical direction,
The plastic bottle according to any one of claims 1 to 5, wherein the block pattern is formed between the at least two concave ribs. The bottle peripheral surface is further formed with a recess for inserting a finger,
In a vertical region between the at least two concave ribs, there is a non-block region in which a part of the recess is formed, and a block in which only the basic blocks are arranged in the horizontal direction below the region. The plastic bottle according to claim 6, wherein the region is included. The pressure absorbing surface is configured such that the bottom portion of the hollow portion is deformed so as to swell when a top load is applied to the plastic bottle, and the deformation is restored when the top load is released. Have
The plastic bottle according to claim 7, wherein at least a part of the pressure absorbing surface is formed in the non-blocking region. The bottle surface,
A block pattern formed in the circumferential direction on the peripheral surface of the bottle and formed by combining a plurality of types of concave blocks in the vertical direction and the horizontal direction,
The plurality of types of concave blocks include at least one basic block, at least one vertical block longer in the vertical direction than the basic block, and a plurality of horizontal blocks longer in the horizontal direction than the basic block,
The plurality of horizontally long blocks are arranged so as to be continuous in the vertical direction, and the horizontally long blocks adjacent to each other are arranged so as to be displaced in the horizontal direction. The bottle surface,
A block pattern formed in the circumferential direction on the peripheral surface of the bottle and formed by combining a plurality of types of concave blocks in the vertical direction and the horizontal direction,
The plurality of types of concave blocks include at least one basic block, a plurality of vertically long blocks that are longer than the basic blocks, and at least one horizontally long block that is longer than the basic blocks.
The plastic bottle in which the plurality of vertically long blocks are arranged so as to be continuous in the horizontal direction, and the vertically long blocks adjacent to each other are displaced in the vertical direction.