JP6578654B2 - Plastic container - Google Patents

Description

  The present invention relates to a plastic container, and more particularly to a structure of a plastic container molded from a bottomed cylindrical preform by a one-stage blow molding method.

  For example, a PET (PolyEthylene Terephthalate) bottle is used as a plastic container filled with a beverage. PET bottles have been made lighter by reducing the amount of raw materials used. By reducing the weight of the PET bottle, environmental loads such as energy consumption and carbon dioxide emission during transportation and costs are reduced. On the other hand, as the weight of the PET bottle is reduced, the thickness tends to decrease and the strength thereof tends to decrease. For this reason, there is a limit in reducing the weight of the PET bottle.

  PET bottles are stored and transported as a single pallet of a plurality of stacked cardboards with the mouths of a plurality of containers facing upward. In order to further reduce the environmental impact and cost during transportation, it is conceivable to improve the storage capacity when packing in a box.

  In patent document 1, it consists of a container main body, a cap part, and a cap screwed into the plug part, and the container main body has a bottom face, a trunk part, and a shoulder part, and the plug part is depressed from the shoulder part. A plastic container is disclosed, in which a recess around the part is formed and a shoulder part forms the uppermost surface of the container.

JP 2010-264983 A

  According to the plastic container of Patent Document 1, it is said that the container can be directly stacked because the uppermost surface of the container is flat without a spout protruding from the stopper. Further, in Patent Document 1, a portion that becomes a container body including a cap portion is formed in advance using a polyethylene terephthalate resin as a preform by an injection molding method or the like, and the preform is heated again to form a container body. It is described that a container can be efficiently molded using a stretch blow molding method for forming a portion.

  However, in the plastic container of Patent Document 1, since the shoulder portion forms the uppermost surface of the container, the shoulder portion protrudes upward from the recess around the plug portion. Therefore, the plastic container of Patent Document 1 is different in shape from widely distributed plastic containers and has low versatility. Furthermore, if the plastic container having such a shape is to be molded by the one-stage blow molding method, the shoulder shape is poor. More specifically, a plastic container having a thin shoulder and a low strength is formed.

  On the other hand, in order to solve this problem, if a plastic container is to be molded by the two-stage blow molding method, not only the apparatus will be enlarged, but it will take extra time for molding.

  Therefore, an object of the present invention is to provide a plastic container that is manufactured at high speed and has a high versatility while having a highly versatile shape.

In order to solve the above problems, a plastic container according to the present invention is formed from a bottomed cylindrical preform by a one-stage blow molding method, and has a mouth portion, a shoulder portion that is inclined with respect to the horizontal direction, and a trunk portion. And a bottom part, the bottom part having a dome protruding above the grounding surface of the plastic container to a height larger than the height of the mouth part, and the diameter of the trunk part / the dome part The shoulder portion is made of a plastically deformable material, has an annular step portion on the shoulder portion, and has a plurality of concave ribs on the step portion. , when the mouth portion is pushed vertically on a side of the body portion, the above shoulder deformation boundaries as the starting point of the rib and the shoulder portion, the lower top than the step portion of the shoulder portion It is configured to be deformable so as to be positioned.

Furthermore, the height of the pre-Symbol dome characterized in that it is a 21～25Mm.

  Furthermore, the stretching ratio in the longitudinal direction of the preform is 2.0 to 6.0.

  Furthermore, the side surface of the dome is a peripheral surface that inclines outward from the plastic container from above to below.

  Furthermore, the difference between the height from the upper end of the dome to the upper end of the mouth and the total height of the preform is at least 3 mm.

Further, the plurality of ribs of the step portion are arranged at equal intervals in the circumferential direction.

  Further, the shoulder portion has a substantially truncated cone shape.

  Further, the plastic container is a PET bottle.

According to the structure which concerns on this invention, it shape | molds from the bottomed cylindrical preform by the 1 step blow molding method, and has a mouth part, the shoulder part which inclines with respect to a horizontal direction, a trunk | drum, and a bottom part. In the plastic container, the bottom part has a dome protruding above the ground surface of the plastic container to a height larger than the height of the mouth part, and the diameter of the trunk part / the maximum diameter of the dome is 1.3 to 4.5. The shoulder portion is made of a plastically deformable material, has an annular stepped portion on the shoulder portion, has a plurality of concave ribs on the stepped portion, and the mouth portion is pushed vertically to the trunk portion side. At the time, the shoulder is deformed starting from the boundary between the rib and the shoulder, and the upper part of the shoulder is configured to be deformed so as to be located below the stepped portion, so that the plastic containers can be stacked vertically, A plastic with high loading efficiency while being manufactured at high speed and having a highly versatile shape. It is possible to provide a container. Furthermore, when the shoulder portion is deformed, the height of the shoulder portion from the mouth portion can be shortened to reduce the overall height of the plastic container. Furthermore, the plastic container can be loaded more stably. The plastic container according to the present invention is suitable for loading.

Furthermore, according to the overall height of the de chromatography beam is 21～25Mm, it is possible to more reliably form the dome. In addition, it is possible to provide a plastic container that is manufactured at high speed and has high loading efficiency while having a highly versatile shape.

  Furthermore, according to the configuration in which the preform has a drawing ratio of 2.0 to 6.0 in the longitudinal direction, each part including the dome can be formed without uneven thickness. In addition, it is possible to provide a plastic container that is manufactured at high speed and has high loading efficiency while having a highly versatile shape.

  Furthermore, according to the structure which the side surface of a dome is a surrounding surface which inclines to the outward of a plastic container from upper direction to the downward direction, a bottom part can be shape | molded with more favorable shaping property. In addition, it is possible to provide a plastic container that is manufactured at high speed and has high loading efficiency while having a highly versatile shape.

  Furthermore, according to the configuration in which the difference between the height from the upper end of the dome to the upper end of the mouth and the total height of the preform is at least 3 mm, the dome can be more reliably formed without uneven thickness.

Furthermore, according to the structure which arrange | positions the some rib of a level | step-difference part at equal intervals in the circumferential direction, a shoulder part can be deformed from the boundary line of a level | step-difference part and a shoulder part. Furthermore, the plastic container can be loaded more stably. In addition, it is possible to provide a plastic container that is manufactured at a high speed and has a high versatility while having a higher loading efficiency.

  Furthermore, according to the configuration in which the shoulder portion has a substantially truncated cone shape, the shoulder portion can be more easily and reliably deformed. Furthermore, the shoulder portion can have a simple and versatile shape. Further, it is possible to provide a plastic container that is manufactured at high speed and has a higher versatility while having a more versatile shape.

  Furthermore, according to the configuration in which the plastic container is a PET bottle, the shoulder portion can be effectively deformed with a versatile material having both moderate strength and plastic deformability. The plastic can be easily molded as a container, and the bottom can be molded with better formability. Further, it is possible to provide a plastic container that is manufactured at high speed and has a higher versatility while having a more versatile shape.

It is the front view by which the PET bottle as an example of the plastic container which concerns on this embodiment was shown. It is a top view of the PET bottle of FIG. It is a bottom view of the PET bottle of FIG. FIG. 2 is a partial front view illustrating an example of a state where the PET bottle of FIG. 1 is deformed. It is a top view of the PET bottle of FIG. It is the partial front view by which an example of another state by which the PET bottle of FIG. 1 was deform | transformed was shown. It is sectional drawing by which an example of the preform for PET bottle shaping | molding which concerns on this embodiment was shown. It is a bottom view of the PET bottle of a comparative example.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, the configuration of the plastic container according to the present embodiment will be described in detail. FIG. 1 is a front view showing a PET bottle 1 as an example of a plastic container according to the present embodiment. 2 is a plan view of the PET bottle 1 of FIG. 1, and FIG. 3 is a bottom view of the PET bottle 1 of FIG. In the following, for convenience of explanation, in the state of FIG. 1 in which the PET bottle 1 is upright, the mouth portion 10 of the PET bottle 1 in which the contents are filled in the plastic container is taken as the top.

  As shown in FIGS. 1 to 3, the PET bottle 1 according to the present embodiment is molded from a bottomed cylindrical preform by a one-stage blow molding method, and is inclined with respect to the mouth 10 and the horizontal direction. It has a shoulder portion 20, a trunk portion 30, and a bottom portion 40. And the bottom part 40 has the dome 43 which protrudes in the height H2 larger than the height H1 of the opening | mouth part 10 upward from the ground surface (bottom wall 42) of PET bottle 1, and with respect to the diameter D1 of the trunk | drum 30. The ratio of the diameter D2 that is the maximum diameter of the dome 43 is within a predetermined range. Furthermore, at least the shoulder portion 20 is made of a plastically deformable material and may have an annular step portion 21. The plastic deformation is a deformation that remains even after the external force is removed. In this embodiment, when a force in the reverse direction (direction in which the mouth portion 10 is pulled) is applied, the PET bottle 1 returns to its original shape. Hereinafter, as a suitable aspect of the PET bottle 1 according to the present embodiment, a round bottle having a circular cross-sectional view in the horizontal direction will be exemplified and described in detail.

  The mouth portion 10 becomes a filling port for contents, a spout, or a drinking mouth, and the PET bottle 1 is sealed by attaching a lid (not shown) to the mouth portion 10. The mouth portion 10 at the stage where the PET bottle 1 is molded has its opening portion formed vertically upward. The mouth portion 10 has a support ring 11 projecting annularly outwardly from the PET bottle 1 on the lower side. Here, the distance from the lower surface of the support ring 11 to the upper end of the mouth 10 is defined as the height H1 of the mouth 10. The height H1 of the mouth 10 is, for example, 21 mm or 17 mm.

  The upper side of the shoulder portion 20 is continuous with the mouth portion 10, while the lower side is continuous with the trunk portion 30. The shoulder portion 20 has a substantially truncated cone shape whose diameter increases from the top to the bottom. And the shoulder part 20 has a circular cross section, and does not have the structure which the shoulder part 20 like the pillar (pillar) which has in the corner part of a square bottle becomes difficult to deform | transform. If the shoulder portion 20 is configured to extend in the horizontal direction, the shapeability is deteriorated. Therefore, as described above, the shoulder 20 has an inclination with respect to the horizontal direction. The shape of the slope of the shoulder 20 is not particularly limited, and may be a shape curved inward, but the shape curved outward is that the curvature reverses inward when the shoulder 20 is deformed. This is preferable from the viewpoint of ease of plastic deformation, strength, and formability showing followability to the designed shape.

  The shoulder portion 20 has an annular step portion 21 whose inclination changes abruptly (discontinuously) at a lower portion thereof. As described above, at least the shoulder 20 of the plastic container according to the present embodiment is made of a plastically deformable material such as PET (polyethylene terephthalate). Therefore, the PET bottle 1 according to the present embodiment can deform the shoulder portion 20 starting from the boundary line with the shoulder portion 20 that is inclined inward in the plan view of the step portion 21. And in PET bottle 1 concerning this embodiment, direction and height of mouth part 10 can be changed freely.

  Such a configuration having the annular step portion 21 below the shoulder portion 20 having a so-called shoulder shape having an inclination with respect to the horizontal direction can be sufficiently molded as the PET bottle 1. Furthermore, the PET bottle 1 according to the present embodiment has a vertically long shape with a circular cross section, and is a shape that is less prone to uneven thickness and has good blow moldability. Furthermore, since the mouth portion of the preform for molding the PET bottle 1 according to the present embodiment, particularly the shape of the support ring, is the same as that of a general one, a general apparatus is provided at the time of heating for blow molding. It can be conveyed with a gripper. Furthermore, since the external shape of the PET bottle 1 after blow molding is substantially the same as a general one, it can be conveyed by a general conveyor. Therefore, the PET bottle 1 according to the present embodiment can be manufactured without requiring a special device. Furthermore, the PET bottle 1 according to the present embodiment, in which the orientation and height of the mouth portion 10 can be changed by the configuration of the shoulder portion 20 as described above, can optimize the state of the content being poured out.

  In addition, the outer peripheral side (refer FIG. 2) of the cyclic | annular level | step-difference part 21 does not need to change the inclination suddenly (discontinuously), and the chamfering may be made cyclically | annularly.

  Shoulder 20 is too thick, it is difficult to deform. On the other hand, if the thickness of the shoulder portion 20 is too thin, the load strength is weakened. Therefore, the thickness of the shoulder portion 20 is preferably 0.05 mm or more and 0.50 mm or less. By setting the thickness of the shoulder portion 20 within this range, the shoulder portion 20 can be easily deformed while maintaining the strength of the shoulder portion 20 as the PET bottle 1. The wall thickness in this range can be sufficiently molded as a PET bottle 1, and the PET bottle 1 can be manufactured without the need for a special device, and the content dispensing state can be made more optimal. it can.

  If the width of the annular step portion 21 is too large or too small, the formability is deteriorated, and if the width of the annular step portion 21 is too large, the step portion 21 itself is deformed. Therefore, the width of the annular step portion 21 is preferably 1 mm or more and 8 mm or less. If the width of the annular step portion 21 is within this range, the shoulder portion 20 can be easily and easily deformed effectively. And the width | variety of the level | step-difference part 21 of this range can fully be shape | molded as a PET bottle 1, and the PET bottle 1 is manufactured without requiring a special apparatus, and the extraction | pouring state of the content is more optimal. can do.

  If the annular stepped portion 21 is configured to extend further downward toward the outside of the PET bottle 1, it is difficult to form an angle with respect to the shoulder portion 20, and it is difficult to function as a starting point for deformation of the shoulder portion 20. . On the other hand, if the annular stepped portion 21 is configured to extend further upward toward the outside of the PET bottle 1, the formability deteriorates. Therefore, the annular step portion 21 is preferably configured to extend in a substantially horizontal direction. If the annular step portion 21 is in a substantially horizontal direction, the step portion 21 can be set at an appropriate angle with respect to the shoulder portion 20 having an inclination with respect to the horizontal direction. With this configuration, the shoulder portion 20 can be reliably deformed starting from the boundary line between the stepped portion 21 and the inclined shoulder portion 20. And the structure of this level | step-difference part 21 is simple, and the PET bottle 1 is manufactured without requiring a special apparatus, and can make the extraction | pouring state of the content more optimal.

  And according to the structure which the angle | corner which the level | step-difference part 21 and the shoulder part 20 make is 95 degree or more and 145 degrees or less, the shoulder part 20 can be easily made easy to deform | transform easily. And the angle | corner which the level | step-difference part 21 of this range and the shoulder part 20 make can fully be shape | molded as a PET bottle 1, and PET bottle 1 is manufactured without the need of a special apparatus, The dispensing state can be made more optimal.

  The shoulder portion 20 may further include a rib 22 that extends in a radial direction (see FIG. 2) with respect to the annular step portion 21. When the shoulder portion 20 is deformed, the portion to be bent is not determined when the rib 22 is not provided. On the other hand, by providing the rib 22 on the stepped portion 21, the boundary between the rib 22 and the inclined shoulder portion 20 becomes a starting point, and the shoulder portion 20 can be easily deformed. Therefore, with this configuration, the shoulder portion 20 can be reliably and easily deformed from the boundary between the rib 22 of the stepped portion 21 and the inclined shoulder portion 20. The rib 22 preferably protrudes from the outer peripheral side of the annular step portion 21 so that the shoulder portion 20 is not affected by the deformation of the shoulder portion 20, but may not be connected to the trunk portion 30. preferable. Further, another rib extending in the horizontal direction for preventing the deformation of the rib 22 from propagating to the body portion 30 may be provided.

  As illustrated in FIG. 1, the rib 22 is preferably formed in a concave shape. According to the configuration in which the rib 22 has a concave shape, the concave portion is folded and the deformation of the stepped portion 21 is absorbed, so that the shoulder portion 20 can be easily deformed. With this configuration, the shoulder 20 can be reliably and more easily deformed from the boundary (bending point) between the concave rib 22 of the stepped portion 21 and the inclined shoulder 20. The rib 22 having a concave shape rather than a convex shape is less likely to be caught when being released from the mold, and the releasability is improved.

  Furthermore, as illustrated in FIG. 2, the shoulder portion 20 may have a plurality of ribs 22, and the plurality of ribs 22 may be configured to be equally spaced in the circumferential direction of the annular stepped portion 21. According to such a structure, when the opening | mouth part 10 is pushed in, the load concerning the shoulder part 20 can be disperse | distributed to the circumferential direction of the PET bottle 1, and the shoulder part 20 can be made easy to deform | transform more easily. Furthermore, the mouth portion 10 can be easily bent in an arbitrary direction.

  The trunk portion 30 has a cylindrical shape erecting in the vertical direction. According to the configuration in which the trunk portion 30 has a cylindrical shape, the deformation of the shoulder portion 20 can be prevented from being hindered. Further, the gripping property of the PET bottle 1 can be maintained by the cylindrical body portion 30. Furthermore, the cylindrical body portion 30 can provide a structure of the PET bottle 1 having strength against external loads, in particular, buckling strength against vertical loads. Furthermore, the trunk portion 30 is highly versatile and has a simple shape, and the PET bottle 1 can be manufactured without the need for a special device, and the state of the contents being poured out can be optimized. The cylindrical body portion 30 illustrated in FIG. 1 is configured to have the same diameter D1.

  The trunk | drum 30 has the cyclic | annular periphery groove | channel 31 in which the hollow to the inside of PET bottle 1 extends in a horizontal direction. The circumferential groove 31 improves the side wall strength, which is the strength that can withstand the load in the horizontal direction of the body portion 30, plays a role of a cushion against the vertical load of the body portion 30, and prevents the body portion 30 from buckling. It has the function to do. In the illustration of FIG. 1, the circumferential groove 31 is composed of an upper circumferential surface, a groove bottom surface, and a lower circumferential surface that are each linear in a sectional view. However, the shape of the circumferential groove 31 is not particularly limited, and the circumferential groove 31 may be, for example, a U-shape in which the groove bottom surface is formed in an arc shape. Chamfering may be made between the surface of the surface.

  In the illustration of FIG. 1, a plurality of three types of circumferential grooves 31 </ b> A, 31 </ b> B, and 31 </ b> C having different groove depths and widths are formed in the body portion 30. The shallow circumferential groove 31A having a small depth and width of the groove has few irregularities on the surface of the body portion 30 and is not easily deformed in the vertical direction. On the other hand, since the deep circumferential groove 31C having a large depth and width has a large side wall strength, it is provided at a location where the side wall strength is particularly required, such as the center in the vertical direction of the body portion 30. good. Further, the intermediate circumferential groove 31B having the intermediate property between the shallow circumferential groove 31A and the deep circumferential groove 31C may be provided at a location that complements the shallow circumferential groove 31A and the deep circumferential groove 31C.

  In the illustration of FIG. 1, two shallow circumferential grooves 31A are provided in the upper and lower portions of the trunk portion 30, and three deep circumferential grooves 31C are provided near the center in the vertical direction of the trunk portion 30. A total of four circumferential grooves 31B are provided, one at each of the upper and lower ends of the body 30 and one between the deep circumferential grooves 31C.

  Furthermore, in order to maintain the strength of the entire body 30 against both the horizontal load and the vertical load of the body 30, the circumferential grooves 31 are arranged symmetrically in the vertical direction of the body 30. It is preferable. For this reason, in the illustration of FIG. 1, the plurality of circumferential grooves 31 are arranged vertically symmetrically in the body portion 30.

  Thus, the PET bottle 1 having functions such as strength, gripping property, and good appearance can be configured by arranging the circumferential grooves 31 having different characteristics at appropriate positions with appropriate intervals.

  In the present embodiment, the structure of the body portion 30 is not particularly limited as long as it has functions such as strength, gripping property, and good appearance. Therefore, the trunk | drum 30 may not be the same diameter, for example, may have the vertical groove | channel of a perpendicular direction, and may be further provided with the pressure absorption panel. Furthermore, the shape, size, number, etc. of each circumferential groove 31 are also designed as appropriate.

The bottom portion 40 is continuous with the bottom portion of the trunk portion 30 at the top. A chamfered portion 41 is formed between the adjacent barrel portion 30 and the bottom portion 40. The bottom 40 has a bottom wall 42 and a dome 43. The substantially flat plate-shaped bottom wall 42 extends in a direction perpendicular to the body 30 and serves as a ground contact surface of the PET bottle 1. The dome 43 is configured to protrude from the bottom wall 42 to the inside of the PET bottle 1. In addition, the structure of the bottom part 40 is not restricted to this, A general shape, for example, the shape in which the rib was provided, may be sufficient.

  In this embodiment, the dome 43 is formed higher than a general bottle. More specifically, when two PET bottles 1 according to the present embodiment are vertically stacked, the dome 43 is high enough to fit the entire mouth portion 10 covered with a cover (not shown). It may be formed. That is, here, when the height H2 of the dome 43 is defined as the height H2 of the dome 43 from the contact surface (bottom wall 42) of the PET bottle 1 to the upper end of the dome 43, the dome is such that the height H1 of the mouth portion 10 <the height H2 of the dome 43. 43 may be formed. The height H2 of the dome 43 is, for example, 25 mm or 21 mm in consideration of the lid that covers the mouth 10. The distance from the lower surface of the support ring 11 to the upper end of the dome 43 is a height H3.

  In that case, if the side surface 44 of the dome 43 is formed on the peripheral surface inclined outward from the PET bottle 1 from the upper side to the lower side, it may be easily stretched at the time of blow molding. Here, if the diameter at the lower end of the dome 43 is the diameter D2 at the lower end of the dome 43, the diameter D2 at the lower end of the dome 43 is the bottom when formed at a predetermined ratio with respect to the diameter D1 of the body portion 30. The wall 42 is not narrowed, and at the time of blow molding, the resin reaches the bottom 40 side and becomes easy to be stretched, so that shaping defects such as whitening are less likely to occur. Furthermore, according to the configuration in which the diameter D1 of the trunk portion 30 and the diameter D2 of the dome 43 are 1.3 or more, the bottom portion 40 can be formed with better shapeability.

  On the other hand, when the diameter D1 of the trunk portion 30 is larger than 4.5 and the diameter D2 of the dome 43 is larger than 4.5, the stretching ratio to the heel (the lower end of the bottom portion 40) is increased, which tends to cause poor shaping. The diameter D2 at the lower end of the dome 43 may be, for example, at least 37 mm taking into account the diameter of the lid that covers the mouth portion 10 and the support ring 11.

  Since the dome 43 has a shape in these ranges, the PET bottle 1 can be sufficiently molded by the one-stage blow molding method, and the PET bottle 1 is manufactured at a high speed without requiring a special device. be able to.

  When the PET bottle 1 according to the present embodiment configured as described above is stacked up and down, the mouth portion 10 is accommodated in the dome 43 and can be stacked in the vertical direction. Therefore, according to the structure which concerns on this embodiment, the PET bottle 1 can be stacked vertically, and it can be manufactured at high speed and can provide a plastic container with high loading efficiency while having a highly versatile shape. Furthermore, the PET bottle 1 according to the present embodiment may be configured to function as a flexible plug that can move the direction and height of the mouth portion 10 arbitrarily.

  Next, two shapes of the state where the shoulder portion 20 of the PET bottle 1 is deformed will be described in detail. FIG. 4 is a partial front view showing an example of a state in which the PET bottle 1 of FIG. 1 is deformed. FIG. 5 is a plan view of the PET bottle 1 of FIG.

  The PET bottle 1 according to the present embodiment is configured to be deformed so that its height is lowered when the mouth portion 10 is pushed downward. Specifically, when the mouth portion 10 is pushed downward, the shoulder portion 20 is deformed starting from the boundary between the rib 22 and the inclined shoulder portion 20, and the shoulder portion inward of the stepped portion 21 in plan view. 20 has a concave slope in front view. As shown in FIG. 5, the lowest point of the concave slope is an annular recess 23.

  As shown in FIG. 4, the shoulder portion 20 is configured to be deformed until the height of the support ring 11 overlaps the stepped portion 21 when the mouth portion 10 is pushed in as much as possible. That is, the PET bottle 1 according to this embodiment is configured to be deformable so that the upper portion of the shoulder portion 20 is positioned below the step portion 21 when the mouth portion 10 is vertically pushed into the body portion 30 side. Is done. Therefore, the upper portion of the step portion 21 is a height H1 of the mouth portion 10 shown in FIG.

  Moreover, in the configuration according to the present embodiment, when the deformed shoulder 20 is returned to the original state, the content remains on the shoulder 20 when the PET bottle 1 is tilted and the content is poured out. There is nothing. Therefore, in this embodiment, it is not necessary to separately provide a mechanism for discharging the contents remaining in the PET bottle 1.

  According to such a configuration, the overall height of the PET bottle 1 can be lowered when the shoulder portion 20 is deformed. The PET bottle 1 having this feature is manufactured without requiring a special device, and the content can be optimally poured out.

  As described above, when the mouth portion 10 is pushed vertically downward, the dimension above the step portion 21 is shortened, and the shoulder portion 20 inclined in the region inward of the step portion 21 is also formed by the step portion 21. Hides downwards. Therefore, when the two PET bottles 1 are vertically stacked, the mouth portion 10 pushed in the vertically downward direction and the dome 43 formed higher than a general bottle can be easily combined.

  Normally, it is difficult to form the shoulder portion 20 in the horizontal direction. In that respect, the PET bottle 1 according to the present embodiment is configured to be deformed so that the shoulder 20 having an inclination with respect to the horizontal direction inward of the stepped portion 21 is hidden below the stepped portion 21. Thus, shortening the overall height of the PET bottle 1 and facilitating the loading of the PET bottle 1 are realized. Furthermore, in the configuration according to the present embodiment, the mouth portion 10 is located above the trunk portion 30 even in a state where the shoulder portion 20 is deformed.

  The PET bottle 1 according to the present embodiment having such a configuration, when it is becoming difficult to further reduce the weight, the stacking per pallet when vertically stacked in two stages and stored in cardboard The effect is that the efficiency is increased by 20%. Furthermore, the PET bottle 1 according to the present embodiment can be vertically stacked and stored in a space having a narrow width and depth, for example, in a scene used for stockpiling, and space saving can be realized. Furthermore, the PET bottle 1 according to the present embodiment can reduce the empty space by pushing the mouth portion 10 vertically downward after filling the contents, and can improve the storage stability of the contents. Furthermore, the PET bottle 1 according to the present embodiment can increase the internal pressure by the mouth portion 10 being pushed vertically downward after capping, and can improve the buckling strength of the PET bottle 1. As described above, the PET bottle 1 according to the present embodiment can exhibit various effects.

  Next, another shape is illustrated and demonstrated in detail about the state which the shoulder part 20 of PET bottle 1 deform | transformed. FIG. 6 is a partial front view showing an example of another state in which the PET bottle 1 of FIG. 1 is deformed. The PET bottle 1 loaded on top and the PET bottle 1 not loaded can be shaped as follows.

  The PET bottle 1 according to the present embodiment is configured such that when the mouth portion 10 is pushed obliquely downward, the opening portion is deformed with an inclination from vertically upward. Specifically, the shoulder portion 20 is deformed from the boundary between the rib 22 on the side pushed by the mouth portion 10 being pushed obliquely downward and the inclined shoulder portion 20, and is pushed in in plan view. The inner side of the stepped portion 21 on the opposite side has a concave slope in front view.

  As shown in FIG. 6, when the mouth part 10 is pushed almost obliquely downward, the shoulder part 20 is deformed until the support ring 11 on the pushed side becomes high enough to overlap the step part 21. It is configured as follows. At that time, the mouth portion 10 is configured so as not to protrude outward from the imaginary line a extending from the outer periphery of the trunk portion 30. That is, in the PET bottle 1 according to the present embodiment, the upper end of the mouth portion 10 when the mouth portion 10 is pushed into the trunk portion 30 side at an angle with respect to the vertical is located inside the outer periphery of the trunk portion 30. It is configured to be deformable so as to be located in the direction.

  According to such a configuration, the contents can be poured out from the PET bottle 1 with a smaller inclination, and the contents can be easily poured or the contents can be easily drinkable. Furthermore, according to such a configuration, it is possible to reduce the influence of pulsation when the contents are poured out and facilitate the pouring, and this effect is more exhibited especially as the PET bottle 1 becomes larger. . Due to these characteristics, the PET bottle 1 according to the present embodiment is also effective for use in a gripping force, a weak wrist force, a nursing care situation, or the like.

  Furthermore, according to the structure which concerns on this embodiment, even when the shoulder part 20 deform | transforms in the state in which the opening | mouth part 10 inclined, it can prevent protruding from the PET bottle 1 to an outer peripheral direction. Therefore, even when the mouth portion 10 is stored in an inclined state, the PET bottle 1 can be accommodated within the outer periphery of the body portion 30 to save space, and adjacent PET bottles 1 do not collide with each other.

  Furthermore, the PET bottle 1 having these characteristics is manufactured without the need for a special device, and the content can be optimally poured out.

  The PET bottle 1 according to this embodiment is not limited by size, and can be applied to various sizes. For example, the volume of the PET bottle 1 may be 200 ml to 2000 ml, and is particularly suitable for the PET bottle 1 having a volume of 500 ml to 1000 ml. In particular, the overall height of the PET bottle 1 is preferably 120 mm to 260 mm, and the diameter D1 of the body portion 30 is preferably 40 mm to 70 mm, and the effects exhibited by the PET bottle 1 according to this embodiment can be suitably obtained.

  The plastic container according to this embodiment can be suitably used for a plastic bottle, and can be particularly suitably used for the PET bottle 1. In the above description, an example in which PET is used as a particularly suitable material for the plastic container according to the present embodiment has been shown. However, in the present embodiment, at least the shoulder 20 may be a material that can be plastically deformed. In addition, it is preferable that the same material is used not only for the shoulder part 20 but the whole container from the viewpoint of integrally molding the plastic container according to the present embodiment. Therefore, it is preferable that a thermoplastic resin is used as the material of the PET bottle 1 according to the present embodiment.

  As the thermoplastic resin constituting the PET bottle 1, in addition to polyethylene terephthalate, for example, thermoplastic polyester such as polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyarylate, or a copolymer thereof, these resins, Alternatively, blends with other resins are suitable, and in particular, ethylene terephthalate-based thermoplastic polyesters such as polyethylene terephthalate can be suitably used. Furthermore, acrylonitrile resin, polyethylene, polypropylene, propylene-ethylene copolymer and the like can also be used. Furthermore, it is also possible to use plant-derived biomass plastics such as polylactic acid (PLA).

  Various additives such as colorants, UV absorbers, mold release agents, lubricants, nucleating agents, antioxidants, antistatic agents, etc. are blended with the above-mentioned resins within a range that does not impair the quality of the molded product. can do. The PET bottle 1 is preferably sterilized by adding hydrogen peroxide and peracetic acid.

  As the ethylene terephthalate thermoplastic resin constituting the PET bottle 1, the ethylene terephthalate unit occupies most of the ester repeating portion, generally 70 mol% or more, and the glass transition point (Tg) is 50 to 90 ° C. Yes, those having a melting point (Tm) in the range of 200 to 275 ° C are suitable. In addition, as an ethylene terephthalate thermoplastic polyester, polyethylene terephthalate is particularly excellent in terms of pressure resistance, but in addition to the ethylene terephthalate unit, dibasic acids such as isophthalic acid and naphthalenedicarboxylic acid, and propylene glycol Copolyesters containing a small amount of ester units composed of diols such as can also be used.

  Furthermore, the PET bottle 1 can be composed of two or more thermoplastic polyester layers. Furthermore, when the PET bottle 1 is constituted by two or more thermoplastic polyester layers, an intermediate layer such as a barrier layer or an oxygen absorbing layer can be provided between the layers. As the oxygen absorbing layer, a layer containing a combination of an oxidizable organic component and a transition metal catalyst, or a gas barrier resin that does not substantially oxidize can be used.

  According to the configuration of the plastic container according to the present embodiment, which is a plastic bottle, in particular, a PET bottle 1, the shoulder 20 is effectively deformed with a highly versatile material having both moderate strength and plastic deformability. be able to. The plastic can be easily molded as a PET bottle 1, and the PET bottle 1 can be manufactured without requiring a special device, and the content can be more optimally poured out.

  The PET bottle 1 can be produced by blow-molding a preform produced by injection molding the above-mentioned material. Next, the configuration of the preform for molding a PET bottle according to this embodiment will be described in detail. FIG. 7 is a cross-sectional view showing an example of a PET bottle molding preform 100 according to this embodiment. The preform 100 according to the present embodiment has a bottomed cylindrical shape with one end opened, and includes a mouth portion 10 having an opening portion 12, a trunk portion 130 connected to the mouth portion 10, and a trunk portion 130. And a bottom portion 140 provided continuously. Since the mouth portion 10 of the PET bottle 1 and the mouth portion 10 of the preform 100 have the same shape, the same reference numerals are used. Furthermore, for convenience of explanation, the preform 100 also has the mouth 10 of the preform 100 in the state shown in FIG. 7 in the same manner as the PET bottle 1 described above.

  It is preferable that the inner diameter D3 and the outer diameter D4 (corresponding to the thread root diameter) of the mouth portion 10 according to the present embodiment are dimensions in the PET bottle 1 that is used as a standard. For example, it may be a dimension corresponding to the PCO1810 standard or the PCO1881 standard. More specifically, the inner diameter D3 of the mouth portion 10 is preferably 21.74 mm ± 0.13 mm. Furthermore, the outer diameter D4 of the mouth portion 10 is preferably 24.94 mm ± 0.13 mm. As described above, the distance from the lower surface of the support ring 11 to the upper end of the mouth portion 10 is the height H1 of the mouth portion 10. More specifically, the height H1 of the mouth portion 10 is preferably any of 21.00 mm ± 0.25 mm (PCO1810 standard) and 17.00 mm ± 0.25 mm (PCO1881 standard).

  The body portion 130 is cylindrical, and has a large diameter portion 131 connected to the mouth portion 10 (the lower surface of the support ring 11), a reduced diameter portion 132 connected to the large diameter portion 131, and a reduced diameter portion 132. And a small-diameter portion 133 that is continuously provided. The outer diameter D5 of the large diameter portion 131 is larger than the outer diameter D6 of the small diameter portion 133. The outer diameter D5 of the large-diameter portion 131 and the outer diameter D6 of the small-diameter portion 133 and the wall thickness have a shape that hardly changes in the vertical direction, whereas the reduced-diameter portion 132 has a small-diameter portion 133 from the large-diameter portion 131 side. It has a substantially truncated cone shape that decreases in diameter toward the side. The bottom portion 140 has a substantially hemispherical shape curved outward.

  Next, an example of a method for manufacturing the preform 100 according to the present embodiment will be described in detail. First, the above-mentioned thermoplastic resin, which is a raw material of the preform 100 (PET bottle 1), is put into an injection molding machine (not shown). Then, the thermoplastic resin is heated and melted and pressurized by an injection molding machine. Next, this thermoplastic resin is injected into a mold (not shown) corresponding to the shape of the preform 100. Then, the preform 100 is molded by cooling the thermoplastic resin injected into the mold for a predetermined time. Finally, the molded preform 100 is taken out from the mold.

  Next, an example of the manufacturing method of the PET bottle 1 according to the present embodiment will be described in detail. First, the preform 100 is set in a blow molding machine (not shown), and only the body portion 130 and the bottom portion 140 are heated. Next, a stretching rod (not shown) is inserted into the preform 100. Then, compressed air is supplied from the inserted stretching rod into the preform 100 (the trunk portion 130 and the bottom portion 140), and the stretching rod extends. Thereby, the trunk | drum 130 and the bottom part 140 of the preform 100 are extended | stretched to the vertical direction and a horizontal direction, and the shoulder part 20, the trunk | drum 30, and the bottom part 40 of PET bottle 1 are shape | molded. By such a blow molding method, the PET bottle 1 according to the present embodiment is obtained. After that, the PET bottle 1 is filled with the contents from the opening 12 of the mouth portion 10, and the mouth portion 10 of the PET bottle 1 is sealed by attaching a lid.

  During blow molding, the thickness of the dome 43 at the bottom 40 is not biased by setting a predetermined value, for example, a draw ratio of 2.0 to 6.0 times in the longitudinal direction of the preform 100. Can be formed. Furthermore, if the height H2 of the dome 43 is within a predetermined range with respect to the longitudinal stretching ratio of the preform 100, the dome 43 can be formed more reliably. Furthermore, when the difference between the height (H1 + H3) from the upper end of the dome 43 to the upper end of the mouth portion 10 and the total height (H1 + H4) of the preform 100 is at least 3 mm, the dome 43 is more surely without uneven thickness. Can be formed.

  As described above, since the PET bottle 1 according to the present embodiment has a relatively simple configuration, the PET bottle 1 can be sufficiently molded by one-stage blow using a highly versatile blow molding machine widely used in the present situation. it can. Therefore, it does not require time for molding unlike the two-stage blow, and high-speed manufacturability of the PET bottle 1 can be realized. Furthermore, in the manufacture of the PET bottle 1 according to the present embodiment, it is not necessary to add a heater or the like to the molding apparatus, so that the apparatus can be prevented from increasing in size and the cost can be suppressed.

  As described above, the PET bottle 1 according to the present embodiment is molded from the bottomed tubular preform 100 by a one-stage blow molding method, and has an inclination with respect to the mouth portion 10 and the horizontal direction. It has a shoulder portion 20, a trunk portion 30, and a bottom portion 40, and the bottom portion 40 has a height H <b> 2 higher than the height H <b> 1 of the mouth portion 10, upward from the ground surface (bottom wall 42) of the PET bottle 1. The dome 43 protrudes, and the ratio of the maximum diameter (diameter D2) of the dome 43 to the diameter D1 of the trunk portion 30 is within a predetermined range. And according to the structure which concerns on this embodiment, the PET bottle 1 can be stacked vertically, can be manufactured at high speed, and can provide the PET bottle 1 with high loading efficiency while having a highly versatile shape.

  Hereinafter, the present disclosure will be described in more detail and specifically with reference to examples. However, the present disclosure is not limited to the following examples.

[Example 1]
<Material>
A PET bottle 1 having the characteristics according to this embodiment shown in FIG. 1 was used. The PET bottle 1 was a round bottle with a capacity of 500 ml produced by one-stage blow molding from the preform 100 shown in FIG. 7, and its weight was 18 g.

<Method>
The PET bottle 1 was boxed in corrugated cardboard in two vertical stacks. The total height of the two-tiered PET bottle 1 was 385.0 mm. Forty-eight PET bottles 1 were boxed on corrugated cardboard with outer dimensions of 280 mm in length, 425 mm in width, and 400 mm in height. At that time, the mouth portion 10 was pushed vertically downward. Corrugated cardboard boxes of PET bottles 1 were loaded on a pallet. The number of PET bottles 1 loaded per pallet was counted.

[Comparative Example 1]
<Material>
FIG. 8 is a bottom view of the PET bottle 200 of the comparative example. A PET bottle 200 having the shape of the bottom portion 240 shown in FIG. 8 and having no features according to the present embodiment was used. The configuration other than the bottom portion 240 of the PET bottle 200 was the same as the configuration of Example 1 shown in FIG. Furthermore, the bottom portion 240 of the PET bottle 200 of Comparative Example 1 is chamfered between the adjacent body portions 30 and a chamfered portion 241 is formed, and the bottom wall 240 and the dome 243 are provided. Same as Example 1. However, the height of the dome 243 is lower than that of the first embodiment, and the rib 245 is provided on the side surface 244 of the dome 243. The PET bottle 200 was a round bottle with a capacity of 500 ml produced by one-stage blow molding from the preform 100 shown in FIG. 7, and its weight was 18 g.

<Method>
The PET bottle 200 was packed in corrugated cardboard in one step. The total height of the PET bottle 200 was 207.6 mm. Twenty-four PET bottles 200 were boxed on corrugated cardboard with outer dimensions of 280 mm in length, 425 mm in width, and 220 mm in height. Corrugated cardboard boxes of PET bottles 200 were loaded on a pallet. The number of PET bottles 200 loaded per pallet was counted.

<Result>
The PET bottle 1 of Example 1 could be loaded more efficiently in the height direction than the PET bottle 200 of Comparative Example 1. As a result, in Comparative Example 1, the number of stacks per pallet was 1100, whereas in Example 1, the number of stacks per pallet was 1350. Assuming that the loading number of Comparative Example 1 is 100%, the loading number of Example is 123%, indicating that the loading efficiency can be increased by 23%. Therefore, it was shown that the PET bottle 1 that can be vertically stacked, manufactured at a high speed, and has a highly versatile shape and high loading efficiency can be formed by a one-stage blow molding method.

  The present disclosure can be suitably used for various containers filled with liquid as contents. However, the present disclosure is not limited to the above-described embodiments. The plastic container of the present disclosure contains, for example, various non-carbonated beverages such as green tea, oolong tea, black tea, coffee, fruit juice, and soft drinks, or seasonings such as soy sauce, sauce, mirin, edible oil, and alcoholic beverages. It is useful for all containers that contain detergents, shampoos, cosmetics, pharmaceuticals, etc., and is suitable for sales by vending machines because containers can be placed on its side. Furthermore, the contents can be used not only for liquids but also for containers filled with powder.

DESCRIPTION OF SYMBOLS 1 PET bottle 10 mouth part 20 shoulder part 21 level | step difference part 30 trunk | drum 40 bottom part 42 bottom wall 43 dome 44 dome side surface 100 preform 130 preform trunk | drum 140 preform bottom part a virtual line extended from the outer periphery of trunk | drum D1 Body diameter D2 Diameter at the bottom of the dome (maximum diameter)
H1 mouth height H2 dome height H4 extension height

Claims (8)

Molded from a bottomed tubular preform by a one-stage blow molding method,
The mouth,
A shoulder having an inclination relative to the horizontal direction;
The torso,
In a plastic container having a bottom,
The bottom is
Upward from the ground contact surface of the plastic container, a dome protruding to a height greater than the height of the mouth,
The diameter of the trunk / the maximum diameter of the dome is 1.3 to 4.5,
The shoulder portion is made of a plastically deformable material,
An annular stepped portion on the shoulder,
A plurality of concave ribs in the stepped portion;
When the mouth portion is pushed vertically to the body side, the shoulder portion is deformed starting from the boundary between the rib and the shoulder portion, and the upper portion of the shoulder portion is positioned below the stepped portion. A plastic container characterized by being configured to be deformable. The plastic container according to claim 1, wherein a height of the dome is 21 to 25 mm. The plastic container according to any one of claims 1 to 2, wherein a draw ratio in a longitudinal direction of the preform is 2.0 to 6.0. 4. The plastic container according to claim 1, wherein a side surface of the dome is a peripheral surface that inclines outward from the plastic container from above. The plastic container according to any one of claims 1 to 4, wherein a difference between a height from an upper end of the dome to an upper end of the mouth portion and an overall height of the preform is at least 3 mm. The plastic container according to any one of claims 1 to 5 , wherein the plurality of ribs of the stepped portion are arranged at equal intervals in the circumferential direction. The plastic container according to claim 1, wherein the shoulder portion has a substantially truncated cone shape. The plastic container according to claim 1, wherein the plastic container is a PET bottle.

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