JP6468861B2 - Plastic bottle - Google Patents

Description

  The present invention includes a cylindrical mouth, a shoulder that continuously expands downward from the lower end of the mouth, a body that continues downward from the lower end of the shoulder, and a bottom that closes the lower end of the body And the inside of the trunk part is filled with contents such as beverages, and the inside of the trunk part is sealed with a cap attached to the mouth part.

  A so-called square bottle is known as a synthetic resin bottle, and this type of square bottle has four flat wall portions in which a body portion is continuously provided in a circumferential direction via a corner portion. The corner portion is formed by a surface connecting the circumferential edges of the flat wall portions adjacent to each other (see, for example, Patent Document 1).

  Each flat wall portion of the trunk portion is provided with a panel portion that allows bulging deformation and immersive deformation in response to a change in internal pressure of the trunk portion. The panel part absorbs the deformation associated with the internal pressure change of the body part and maintains the outer shape of the bottle well.

  In recent years, it has been practiced to wind and attach a film-like roll label around the body. In the case of a square bottle, both ends of the roll label are polymerized and bonded at any one corner portion of the outer surface of the body portion, and the bonded portions are adhered to the outer surface of the corner portion.

Japanese Patent Laid-Open No. 10-175625

  By the way, in a synthetic resin bottle, when the contents are cooled after high temperature filling, the internal pressure change of the body portion becomes relatively large, so that the deformation of the body portion due to the internal pressure change can be concentrated only on the panel portion. In some cases, the corner portion may be deformed. For this reason, at the time of roll label sticking, wrinkles were generated on the roll label, or the sticking portions at both ends of the roll label could be peeled off or shifted.

  In view of the above points, an object of the present invention is to provide a synthetic resin bottle that can reliably maintain the mounted state of the roll label by suppressing deformation of the body portion, particularly the corner portion.

In order to achieve such an object, the present invention provides a cylindrical mouth, a shoulder that continuously expands downward from the lower end of the mouth, and a trunk that continues downward from the lower end of the shoulder. And a bottom part closing the lower end of the body part, and a synthetic resin bottle whose inside is sealed by a cap attached to the mouth part, the body part being interposed via a corner part And provided with four flat wall portions continuously provided in the circumferential direction, and is formed in a rectangular tube shape, and the corner portion is formed by a surface connecting the circumferential edges of the adjacent flat wall portions, and the trunk portion. Each of the flat wall portions is provided with a panel portion that allows bulging deformation and immersive deformation in response to a change in internal pressure of the body portion, and the outer surface of the body portion is hidden so that the panel portion is hidden. A film-like roll wound in the circumferential direction and bonded at both ends at any one of the corners. A roll label, a vertical bead provided in the vicinity of the boundary position between the flat wall portion and the corner portion or extending in the vertical direction within a range smaller than the vertical width of the roll label, and the flat wall portion At least one of the upper and lower sides of the panel part, a groove-like horizontal bead extending linearly in the lateral direction, and a position above the panel part and having a predetermined distance below the upper edge of the body part in, and a groove-like annular bead continuous over the entire circumference of the barrel, the transverse bead is open at the corner portion of each of both end portions are adjacent to both sides of the flat wall portion, the corner The annular bead of the portion has a depth and a distance between the outer edge of the upper inner surface and the outer edge of the lower inner surface larger than other portions, and further, the outer edge of the lower inner surface. But other than the corner Wherein the serial is formed so as to be positioned below the annular bead.

  According to the present invention, by providing the vertical bead, it is possible to suppress the deformation of the corner portion due to the change in internal pressure, so the occurrence of wrinkles on the roll label attached to the barrel portion, peeling from the barrel portion, The sticking part can be prevented from shifting.

  That is, in order to prevent deformation of the body portion due to pressure change inside the bottle, a panel portion that is bulged or immersively deformed is formed on the flat wall portion of the body portion. In the present invention, deformation is obtained not only in the panel portion but also in the flat wall portion by the vertical bead provided at the boundary with the corner portion adjacent to the flat wall portion. Therefore, even if a relatively large pressure change occurs inside the bottle, the deformation of the body can be reliably absorbed within the range of the flat wall portion, and the deformation of the corner portion can be suppressed.

Further, by providing the horizontal bead, when the barrel receives a load from the horizontal direction (for example, a load when stacked in a plurality of stages in a sideways posture in a column of a vending machine), a flat wall Since inadvertent deformation of the part can be prevented, it is possible to prevent the roll label wound around the body part from loosening and wrinkles.

Moreover, the intensity | strength with respect to the load from the horizontal direction of a trunk | drum can be improved by providing the said annular bead in a trunk | drum. In addition, in the annular bead at the corner portion, the depth and the distance between the outer edge of the upper inner surface and the outer edge of the lower inner surface are made larger than the other parts, and the outer side of the lower inner surface Since the end edge has a shape positioned below the annular bead other than the corner portion, the annular bead can be provided without narrowing the outer surface of the corner portion above the annular bead among the corner portions. Thereby, the sticking surface of the corner part which apply | coats the adhesive agent for sticking a roll label can be ensured reliably, and the firm sticking state of a roll label can be maintained.

The side view which shows the synthetic resin bottles of embodiment of this invention. The side view which shows the synthetic resin bottle of this embodiment of the state which removed the roll label. III-III sectional view taken on the line of FIG. A is sectional drawing of the annular bead located in a flat wall part, B is sectional drawing of the annular bead located in a corner part. Explanatory drawing which expands one of the corner parts of a trunk | drum, and sees a cross section, and shows the sticking state of a roll label.

  An embodiment of the present invention will be described with reference to the drawings. A synthetic resin bottle 1 (hereinafter referred to as a bottle 1) of this embodiment is a substantially cylindrical PET bottle formed by biaxially stretching a preform (not shown) made of polyethylene terephthalate (PET) resin by blow molding. Yes, as shown in FIG. 1, through a mouth portion 3 (see FIG. 2) sealed by screwing the cap 2 and a shoulder portion 4 that gradually increases in diameter downward from the mouth portion 3. Further, a barrel portion 5 provided below the barrel portion 5 and a bottom portion 6 for closing the lower portion of the barrel portion 5 are provided.

  As shown in FIG. 1, a roll label 7 is attached to the body portion 5. The roll label 7 is a thin synthetic resin sheet formed in a band shape, and is printed such as displaying contents.

  As shown in FIGS. 2 and 3, the body portion 5 is formed in a rectangular tube shape including four flat wall portions 9 continuously provided in the circumferential direction via the corner portion 8.

  Each flat wall portion 9 is formed with a panel portion 10 that allows bulging deformation and immersive deformation in response to a change in internal pressure of the body portion 5. Each corner part 8 is comprised by the curved surface which connects the circumferential direction edge of the flat wall part 9 adjacent to each other.

  A groove-like vertical bead 11 extending in the vertical direction is formed at a boundary position between each flat wall portion 9 and each corner portion 8. The vertical bead 11 is formed to have a length substantially equal to the vertical length of the panel unit 10. In this embodiment, the vertical bead 11 is provided at the boundary position between the flat wall portion 9 and the corner portion 8, but the vertical bead 11 may be provided in the vicinity of the boundary position.

  As described above, since the vertical beads 11 are provided along the both sides in the horizontal direction of the panel portion 10, even if the internal pressure change of the body portion 5 that cannot be absorbed by the deformation of only the panel portion 10 occurs, The entire surface of the flat wall portion 9 between 11 can be deformed and absorbed. In addition, since the groove shape of the vertical bead 11 has an effect of improving the strength of the body portion 5, the deformation allowable range of the flat wall portion 9 can be expanded without reducing the strength of the body portion 5. Therefore, even if a relatively large deformation occurs in the flat wall portion 9, the deformation at this time hardly affects each corner portion 8, and the deformation of the corner portion 8 due to the internal pressure change of the body portion 5 is suppressed. Can do.

  Further, as shown in FIG. 2, each flat wall portion 9 of the body portion 5 is formed with a groove-like lateral bead 12 that is positioned above and below the panel portion 10 and extends linearly in the lateral direction. ing. The lateral bead 12 is longer than the lateral length of the panel portion 10, and each lateral end of each lateral bead 12 is opened at each corner portion 8.

  When the horizontal bead 12 is formed on each flat wall portion 9, the trunk portion 5 receives a load from the lateral direction (for example, a load when stacked in a plurality of stages in a sideways posture in a column of a vending machine). In addition, inadvertent deformation of the flat wall portion 9 can be prevented. Furthermore, each lateral bead 12 has a shape in which both lateral ends are open at the corners 8, so that a relatively complicated uneven surface due to the panel portion 10, the longitudinal bead 11, the lateral bead 12, and the like is formed on the body portion 5. Even if it exists, the thickness of the barrel portion 5 is made uniform during blow molding, and a good barrel portion 5 is formed. The lateral beads 12 may be provided only on either the upper side or the lower side of the panel unit 10.

  Further, as shown in FIG. 2, a groove-like upper annular bead 13 and a lower annular bead 14 are formed in the body portion 5 so as to be continuous over the entire circumference.

  The upper annular bead 13 corresponds to the annular bead of the present invention, and is formed at a position having a predetermined distance downward from the upper edge of the trunk portion 5 (boundary with the shoulder portion 4). The upper annular bead 13 disposed at this position extends in the circumferential direction through the space between the lateral bead 12 of each flat wall portion 9 and the panel portion 10.

  By providing the upper annular bead 13, the strength against the load from the lateral direction of the body portion 5 can be improved. In the present embodiment, however, the upper annular bead 13 is further positioned on the flat wall portion 9 in the upper annular bead 13 shown in FIG. 4A. It is located in the corner portion 8 in the upper annular bead 13 shown in FIG. 4B rather than the depth D1 and the outer vertical width W1 (the distance between the outer edge of the upper inner surface and the outer edge of the lower inner surface). The depth D2 and the outer vertical width W2 of the portion to be made are large.

  According to this, the rigidity of the corner portion 8 is dramatically improved. Due to the high rigidity of the corner portion 8, for example, the corner portion 8 can be reliably locked by the stopper mechanism provided at the dispensing port of the vending machine. Occurrence of payout etc. can be prevented.

  A roll label 7 is attached to the body portion 5, and the panel portion 10, the vertical bead 11, the horizontal bead 12, the upper annular bead 13 and the lower annular bead 14 are covered with the roll label 7.

  When the roll label 7 is attached to the body part 5 of the bottle 1, first, one end part is attached to one of the corner parts 8 of the body part 5 with an adhesive and wound in the circumferential direction of the body part 5. After that, as shown in FIG. 5, the other end is polymerized to the one end and joined via an adhesive. The adhesive strength of the adhesive at this time is appropriately selected. In order to facilitate separation when the bottle 1 is recycled, an adhesive that is easily peeled off manually is generally used. The

  The bottle 1 of the present embodiment has a configuration suitable for mounting the roll label 7. That is, as described above, as shown in FIG. 4B, the upper annular bead 13 is large in the depth D2 and the outer vertical width W2 of the portion located in the corner portion 8, but the outer edge of the lower inner surface is flat. It is located below the part (other than the corner part 8) located on the wall part 9, and the position of the outer edge of the upper inner surface is formed the same as the part located on the flat wall part 9.

  According to this, the distance between the upper edge of the corner portion 8 and the outer edge of the upper inner surface of the upper annular bead 13 is not reduced, and the application area of the adhesive for attaching the roll label 7 is upper. It is not narrowed by the annular bead 13. Therefore, the sticking state of the roll label 7 can be firmly maintained while improving the rigidity of the corner portion 8.

  Further, as described above, the vertical bead 11 suppresses the deformation of the corner portion 8 due to the change in the internal pressure of the body portion 5, so that the roll label 7 attached to the body portion 5 is wrinkled and peeled off from the body portion. Can be prevented.

  Further, as described above, the lateral beads 12 improve the strength against the load from the lateral direction of the body portion 5, and this also prevents the roll label 7 attached to the body portion 5 from being loosened and wrinkled. can do.

  DESCRIPTION OF SYMBOLS 1 ... Plastic resin bottle, 2 ... Cap, 3 ... Mouth part, 4 ... Shoulder part, 5 ... Body part, 6 ... Bottom part, 7 ... Roll label, 8 ... Corner part, 9 ... Flat wall part, 10 ... Panel part , 11 ... vertical bead, 12 ... horizontal bead, 13 ... upper annular bead (annular bead).

Claims (1)

A cylindrical mouth portion, a shoulder portion that continuously expands downward from the lower end of the mouth portion, a trunk portion that continues downward from the lower end of the shoulder portion, and a bottom portion that closes the lower end of the trunk portion A synthetic resin bottle in which the inside of the body is sealed by a cap attached to the mouth,
The trunk portion includes four flat wall portions that are continuously provided in the circumferential direction via corner portions, and is formed in a square cylindrical shape, and the corner portions are formed by connecting circumferential edges of adjacent flat wall portions to each other. It is composed of connecting surfaces, and each flat wall portion of the trunk portion is provided with a panel portion that allows bulging deformation and immersive deformation in response to an internal pressure change of the trunk portion.
A film-like roll label wound in the circumferential direction on the outer surface of the body portion so that the panel portion is hidden, and having both ends attached at any one of the corner portions;
A vertical bead extending in the vertical direction within a range smaller than the vertical width of the roll label provided near the boundary position of the flat wall portion and the corner portion or near the boundary position;
A groove-like lateral bead extending linearly in the lateral direction on at least one of the upper and lower sides of the panel portion in the flat wall portion ,
A groove-shaped annular bead continuous over the entire circumference of the trunk portion at a position above the panel portion and at a predetermined distance below the upper edge of the trunk portion;
The lateral beads are open at the respective corner portions that are adjacent to both sides of the flat wall portion at both ends ,
The annular bead of the corner portion has a depth and a distance between the outer edge of the upper inner surface and the outer edge of the lower inner surface larger than the other portions, and further, the outer side of the lower inner surface. A synthetic resin bottle characterized in that an end edge is formed below the annular bead other than the corner portion .

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