JP5311111B2 - Blow molded container made of synthetic resin - Google Patents

Description

  The present invention relates to a bottle-shaped synthetic resin blow-molded container having a barrel portion provided with a plurality of panel walls for absorbing vacuum.

  For example, if a PET biaxially stretched blow molded container is filled with high-temperature contents and cooled in a sealed state, a reduced pressure is generated in the container and the container is illegally deformed. A panel wall for absorbing vacuum is deformed in a fixed form to provide a panel wall for absorbing vacuum at the barrel portion of the container.

As a panel wall that exhibits this reduced pressure absorption function, a technique is known in which a regular polygonal cylindrical part is provided in the body of the container, and each flat wall part of the regular polygonal cylindrical part functions as a panel wall. (For example, refer to Patent Document 1).
JP 2002-332022 A

  In this prior art, since the entire flat wall of the regular polygonal cylindrical body can function as a panel wall, a panel wall having a large area can be obtained for the size of the body of the container, Thus, the required vacuum absorption capacity can be obtained.

  However, in the above-described prior art, the depression deformation for absorbing the reduced pressure of the panel wall is a deformation form in which the bending state is increased from the flat state, so that the force required for the deformation is accelerated as the depression deformation progresses. Therefore, there is a problem that when the degree of decompression increases, it becomes difficult to obtain a smooth decompression absorption operation.

  This means that, for example, when the panel wall is pressed under normal pressure to pour out the contents, the panel wall can be easily depressed at the beginning, but it becomes difficult to be deformed immediately. For this reason, there is a problem that it is difficult to squeeze the panel wall to pour out the contents.

  Therefore, the present invention was devised to solve the above-described problems in the prior art, and it is technically possible to dispense contents using a panel wall that exhibits a reduced pressure absorption function. It is an object of the present invention to obtain an expanded range of use of a container having a reduced pressure absorption function for a squeeze container.

  The main configuration of the present invention is that a rectangular tube portion having a regular polygonal cylindrical shape is provided in a body portion in which a lower end is closed by a bottom portion and a shoulder portion and a mouth tube portion are continuously provided at an upper end, and the rectangular tube portion is formed into a flat column wall. The corner is chamfered and the side part is a panel wall for absorbing vacuum to constitute a blow molded container.

Each panel wall of the rectangular tube portion has a straight vertical cross-sectional shape, and a horizontal cross-sectional shape is inside the circular arc position of a virtual cylindrical surface that circumscribes the rectangular tube portion, and between adjacent column walls. It has a curved wall structure that is located outside the flat position that is connected by a straight line and that is slightly bulged outward and curved.

  Since each corner of the square tube is rounded by a flat column wall, the connection angle with each panel wall is increased correspondingly, thereby supporting each panel wall in a state where it is easily bent and deformed. become.

  Each panel wall of the square tube part has a curved shape with a transverse cross-sectional shape bulging outward, so that the depression deformation that absorbs the reduced pressure is an inversion deformation. The internal volume of is greatly reduced.

  When the container is opened, the inside of the container returns to the normal pressure state, so that the panel wall is restored to its original shape.When the panel wall is pressed by the fingertip, the panel wall is inverted and deformed, thereby causing the inner volume of the container to be restored. Can be greatly reduced.

  In addition to the main configuration described above, another configuration of the present invention is a short cylindrical end having an outer diameter equal to or slightly larger than a virtual circumscribed circle of the rectangular tube portion at the upper and lower ends of the rectangular tube portion. This is a series of cylinders.

  In the case where a short cylindrical end tube portion is connected to the upper and lower ends of the rectangular tube portion, the upper and lower end portions of the rectangular tube portion are strongly reinforced against external force from the lateral direction. The cylindrical shape of the part is stably maintained.

  Further, in addition to the main configuration described above, another configuration of the present invention is configured in a cylindrical shape in which a skirt cylindrical portion connected to the bottom portion is provided below the square cylindrical portion, and the skirt cylindrical portion has a diameter expanded downward. It is a thing.

  In the case where the skirt tube portion is provided below the square tube portion, since the large diameter portion is located at the lower end portion of the container, a stable “seat” function can be obtained and the capacity of the container is increased. be able to.

  Further, in addition to the main configuration described above, another configuration of the present invention is a configuration in which a nozzle cap is closely assembled to the mouth tube portion, and a nozzle cylinder that is opened and closed by the opening and closing cap is erected on the nozzle cap. is there.

  When the nozzle cap is tightly assembled to the mouth tube portion, the contents are suitable from the nozzle tube of the nozzle cap when the panel tube wall is depressed and deformed by squeeze deformation under normal pressure. Can be poured out.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the blow molded container of the present invention, each corner portion of the square tube portion is rounded by the column wall, so that each panel wall is supported in a state where it is easily bent and deformed. The volume reduction deformation of the container due to the depression bending deformation can be obtained without difficulty.

  In addition, each panel wall of the rectangular tube portion has a curved shape with its cross-sectional shape bulging outward, so that the depression deformation that exerts a reduced pressure absorption action and a volume reduction action of the container becomes an inversion deformation, Thereby, a large volume reduction effect can be obtained.

  In the case where a short cylindrical end tube portion is connected to the upper and lower ends of the rectangular tube portion, the upper and lower end portions of the rectangular tube portion are strongly reinforced against external force from the lateral direction. Thus, the cylindrical shape of the portion can be stably maintained, whereby a stable depression deformation operation of the panel wall of the rectangular tube portion can be obtained.

  In the case where the skirt cylinder part is provided below the square cylinder part, the large diameter part is located at the lower end part of the container, so that a stable “seat” function can be obtained and the grip when the container is used is used. In particular, when the contents are poured out while holding the container in an almost inverted shape, the expanded skirt tube portion exhibits a non-slip function. Safe handling can be obtained.

  When the nozzle cap is tightly assembled to the mouth tube portion, the contents are suitable from the nozzle tube of the nozzle cap when the panel tube wall is depressed and deformed by squeeze deformation under normal pressure. Therefore, the contents of dressing and the like function suitably for dispensing a desired amount to a desired location.

Hereinafter, the embodiments of the present invention will be described with reference to FIGS.

  FIG. 1 is a partially cutaway front view of a blow-molded container 1 according to the present invention assembled with a nozzle cap 15. The blow-molded container 1 is a biaxially stretched blow-molded product made of polyethylene terephthalate and has a lower end. The upper end portion of the body portion 5 closed by the bottom portion 14 is configured by connecting a mouth tube portion 2 having a neck ring 3 formed on the outer peripheral surface through a shoulder portion 4 whose diameter is reduced upward.

The trunk portion 5 includes an upper square tube portion 6 and a lower skirt tube portion 12. The square tube portion 6 has a regular hexagonal cylinder shape, and the upper and lower end portions thereof have a square tube portion 6 at its upper and lower ends. The outer diameter is slightly larger than the imaginary circumscribed cylindrical surface. A short cylindrical end tube portion 10 is provided, and a skirt tube portion 12 has a truncated cone shape whose diameter is expanded downward, and a rib circumference is provided at an upper end continuously provided on the square tube portion 6 side. A reinforcing peripheral rib 13 is provided at the lower end of the groove 11 and the bottom portion 14.

  As shown in FIG. 2, the rectangular cross section of the square tube portion 6 is cut off along the line AA in FIG. In addition, the panel wall 7 forming each side is configured to have a curved wall structure that slightly bulges outward. The degree of the curved bulge of the panel wall 7 is assumed to circumscribe the rectangular tube portion 6. Although it is inside the circular arc position r of the cylindrical surface, it is naturally located outside the flat position s connecting adjacent column walls 9 with a straight line.

  Moreover, as shown in FIG. 3 which the longitudinal cross-sectional shape of the square cylinder part 6 cut | disconnected along the BB line in FIG. It has a structure in which the gap is connected by an inclined end wall 8.

  Since each panel wall 7 in the square tube portion 6 is formed in a flat plate shape and is continuously connected via a column wall 9 that can be deformed to some extent, the inverted depression deformation is simultaneously performed. In combination with the bending deformation of the column wall 9 that is caused, it becomes smooth and reasonable.

  This inversion deformation of the panel wall 7 is performed with the flat position s in FIG. 2 as a substantially inversion point, and the inversion position t is substantially symmetrical with the panel wall 7 shown as a solid line with the flat position s as a symmetric line. To position.

  The end tube portions 10 positioned above and below the square tube portion 6 reinforce the square tube portion 6 having a regular hexagonal tube shape against an external force from the lateral direction. By holding the shape so as not to be distracted by the end tube portion 10, the elastic reversal deformation of each panel wall 7 is performed stably and smoothly.

  The skirt tube portion 12 has a truncated cone shape with a diameter expanded downward, and the bottom portion 14 is continuously provided at the lower end thereof, so that the “seat” area formed by the bottom portion 14 can be increased. As a result, the blow molded container 1 can be provided with a stable “seat” function, and the grip of the blow molded container 1 can be stabilized, so that good and safe handling can be obtained during use.

  The rib circumferential groove 11 provided between the upper end of the skirt tube portion 12 and the end tube portion 10 provided at the lower end of the square tube portion 6, and the reinforcement provided between the lower end of the skirt tube portion 12 and the bottom portion 14. The circumferential rib 13 reinforces the buckling strength of the blow-molded container 1 and enhances the resistance against the lateral load of the skirt tube portion 12 that has a basically cylindrical structure.

  A nozzle cap 15 that is closely assembled to the mouth tube portion 2 of the blow-molded container 1 is a tapered tube-shaped nozzle tube 17 from the center of the top wall of the assembly tube 16 that is externally attached to the mouth tube portion 2 and is undercut. The nozzle cylinder 17 is opened and closed by an opening / closing cap 18 that is detachably screwed onto the nozzle cylinder 17.

  The blow molded container 1 shown in FIG. 1 is filled and sealed with a dressing or the like heated to 70 ° C. (semi-heat resistant level), and allowed to cool to room temperature. Absorption capacity could be secured.

  Moreover, since each panel wall 7 returns to the original shape of the bulging shape after opening, it is opposed by pressing the square tube portion 6 with the fingertip while holding the blow molded container 1 upside down. Each of the pair of panel walls 7 can be inverted and deformed, and the squeeze deformation allows sufficient contents to be poured out.

  At this time, by adjusting the degree of pressing of the panel wall 7, the amount of contents to be poured out can be adjusted freely and easily.

  In the illustrated embodiment, an example of a regular hexagonal cylindrical body is shown as the rectangular cylindrical portion 6, but the rectangular cylindrical portion 6 is not specified as a regular hexagonal cylindrical shape, and is another regular polygonal cylindrical body. Also good. However, from the viewpoint of the squeeze operation for pouring out the contents, it is desirable that the panel wall 7 is an even polygon facing each other.

  As described above, the technique shown in the blow-molded container of the present invention imparts both a vacuum absorption capacity and a squeeze property to the container. A wide range of usage can be expected as a technology applied to containers that are pressed out.

It is the whole front view which fractured | ruptured partially which shows the example of 1 embodiment of this invention. It is the principal part enlarged plan view cut | disconnected along the AA line in FIG. FIG. 2 is an enlarged vertical cross-sectional view of a main part taken along a line BB in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Blow molding container 2; Mouth tube part 3; Neck ring 4; Shoulder part 5; Body part 6; Square cylinder part 7; Panel wall 8; End wall 9; 12; skirt tube 13; reinforcing peripheral rib 14; bottom 15; nozzle cap 16; assembled tube 17; nozzle tube 18; open / close cap r; arc position s; flat position t;

Claims (4)

The lower end is closed at the bottom, and a regular polygonal cylindrical tube is provided on the body with the shoulder and mouth tube connected to the upper end, and the rectangular tube is rounded with a flat column wall. The side portion is configured as a panel wall for absorbing vacuum, and each panel wall has a vertical cross-sectional shape that is linear and a horizontal cross-sectional shape that is larger than the arc position of a virtual cylindrical surface that circumscribes the rectangular tube portion. A synthetic resin blow molded container having a curved wall structure which is located on the inner side and located on the outer side of a flat position where adjacent column walls are connected by a straight line, and is curved outward and curved slightly. 2. The synthetic resin blow according to claim 1, wherein a short cylindrical end tube portion having an outer diameter equal to or slightly larger than a virtual circumscribed circle of the square tube portion is continuously provided at both upper and lower ends of the square tube portion. Molded container. The synthetic resin blow-molded container according to claim 1 or 2, wherein a skirt tube portion provided continuously to the bottom portion is provided below the square tube portion, and the skirt tube portion is formed in a tubular shape whose diameter is expanded downward. The synthetic resin blow-molded container according to any one of claims 1 to 3, wherein a nozzle cap is closely assembled to the mouth tube portion, and a nozzle tube that is opened and closed by the opening and closing cap is erected on the nozzle cap.

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