JP2014213935A - Thermal filling bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal filling bottle that does not exert a large influence on an appearance design and that can sufficiently carry out a decompression absorption function.SOLUTION: A thermal filling bottle 1 of the present invention, which is direct blow-molded, has a filling space M that is formed inside a body part 4, and enables filling the filling space M with heated contents. The body part 4 has a peripheral groove 6 that is formed by depressing the body part 4 toward the filling space M. In the peripheral groove 6, a groove width Wb on the side of the filling space M is narrower than a groove width Wa on the front side of the body part 4.

Description

  The present invention relates to a hot-fill bottle that is directly blow-molded so as to be able to be filled with heated contents, and more particularly, to a hot-fill bottle made of a synthetic resin having a reduced pressure absorption function.

  Conventionally, when filling a plastic resin bottle with the contents, for example, the bottle is filled with contents heated to about 70 to 90 ° C. for the purpose of sterilizing the contents and the bottle, and immediately attached with a cap. A so-called heat filling method for sealing is known. When such heat filling is performed, when the temperature of the contents decreases and the temperature returns to room temperature, the inside of the bottle may be in a reduced pressure state, and the bottle body may be deformed inward to impair the appearance.

  In order to prevent such deformation, for example, in Patent Document 1, a so-called reduced pressure absorption panel that can be bent and deformed is provided in the body portion, whereby only a specific portion is deformed and the overall appearance is maintained. It is shown. Patent Document 2 discloses a bottle that can absorb a reduced pressure by forming a wavy line portion on a body portion formed of a quadric surface.

Registered Utility Model No. 3050587 JP 2003-40230 A

  By the way, in the bottle described in patent document 1, since the area which a vacuum absorption panel occupies with respect to a trunk | drum becomes comparatively large, there exists a concern of affecting an external appearance design. Further, in a small bottle having a capacity of 100 ml or less, it is difficult to secure a sufficient panel area, and it is difficult to obtain an effective reduced pressure absorption effect. On the other hand, in the bottle described in Patent Document 2, the ridges and valley sections (both forming the body surface) arranged adjacent to the ridges and the ridges at the time of absorption under reduced pressure are formed on the inside of the trunk. There is a problem of deteriorating the appearance of the bottle because it bends and deforms.

  An object of the present invention is to solve such a conventional problem, and the object of the present invention is not to have a great influence on the appearance design, and can fully exhibit the reduced pressure absorption function. A new hot-fill bottle is proposed.

The present invention has a filling space formed on the inside of the body portion, and can be filled with the heated contents in the filling space, and is a direct blow molded hot filling bottle.
The trunk portion has a circumferential groove in which the trunk portion is recessed toward the filling space;
The circumferential groove is a heat filling bottle characterized in that the groove width on the filling space side is narrower than the groove width on the body surface side.

  The circumferential groove is opposed to the upper wall extending in a substantially horizontal direction from the body surface side toward the filling space side, and approaches the upper wall from the body surface side toward the filling space side. It is preferable to include a lower wall inclined in a direction and a groove bottom wall that connects the upper wall and the lower wall to form a groove bottom.

  The hot-fill bottle of the present invention has a circumferential groove in which the body part is recessed toward the filling space in the body part, and the circumferential groove corresponds to the groove width (opening width) on the body surface side. The groove width (groove bottom width) on the filling space side is narrow. When direct blow molding is performed using a mold corresponding to such a shape, the thickness of the bottle tends to be reduced near the bottom of the circumferential groove and the boundary between the circumferential groove and the body part. These parts are easily bent. Thereby, it becomes possible to narrow the opening width of the circumferential groove in the reduced pressure state, and the required reduced pressure absorption function is sufficiently exhibited.

  The circumferential groove is inclined in a direction that faces the upper wall from the body surface side toward the filling space, and an upper wall that extends in a substantially horizontal direction from the body surface side toward the filling space side. In the case where the lower wall to be formed and the groove bottom wall that forms the groove bottom by connecting the upper wall and the lower wall are provided, the direct wall blow molding tends to reduce the thickness of the lower wall. For this reason, a lower wall becomes easier to move and a decompression absorption function will be exhibited reliably.

It is a half sectional view showing one embodiment of the filling bottle according to the present invention. It is a principal part expanded sectional view of the circumferential groove shown in FIG. 1, (a) shows the state before pressure reduction, (b) shows the state after pressure reduction.

  First, an embodiment of the hot-fill bottle of the present invention (hereinafter sometimes simply referred to as “bottle”) will be described with reference to the drawings. FIG. 1 is a half sectional view showing an embodiment of a filling bottle according to the present invention, and reference numeral 1 in the drawing denotes this bottle. The bottle 1 is made of a synthetic resin, and in this embodiment, the bottle 1 is obtained by direct blow molding using a parison made of polypropylene (PP). Since polypropylene is resistant to bending and has excellent elasticity, the bottle 1 can be used as a squeeze-type bottle that discharges contents by applying a pressing force from the outside. Moreover, when it forms with the synthetic resin of the 3 layer structure which made the inner layer and the outer layer polypropylene (PP), and made the intermediate | middle layer EVOH, it can be used as a bottle excellent in gas barrier property. A layer having various functions (for example, a light shielding layer) can be further added or replaced, and a synthetic resin other than polypropylene can be used, and various materials can be used depending on the application.

  In this embodiment, the bottle 1 has an outer shape in which a cylindrical mouth portion 2 is integrally connected with a shoulder portion 3, a cylindrical body portion 4, and a disk-shaped bottom portion 5 having a recessed central portion in order. Therefore, a filling space M for the contents is formed on the inside. A male screw is formed on the outer peripheral surface of the mouth portion 2 so that a cap (not shown) can be held with screws. In addition, on the bottom 5 side of the body portion 4, there is provided a single circumferential groove 6 that is continuous along the circumferential direction and formed so as to be recessed toward the filling space M. Yes. Since the groove width is narrow with respect to the area of the trunk | drum 4, the circumferential groove 6 does not stand out so much in appearance. The bottle of this embodiment is an example of a small bottle having a volume of about 80 ml.

  As shown in FIG. 2A, the circumferential groove 6 is opposed to the upper wall 7 extending in a substantially horizontal direction from the surface side of the body portion 4 toward the filling space M side, and to the upper wall 7. A lower wall 8 that is inclined toward the upper wall 7 from the surface side of the portion 4 toward the filling space M side, and a groove bottom wall 9 that connects the upper wall 7 and the lower wall 8, thereby An opening 10 is formed on the surface side of the body 4, and a groove bottom 11 is formed on the filling space M side. The groove width Wb at the groove bottom 11 is narrower than the groove width Wa at the opening 10.

  Here, the mold for molding the bottle 1 is provided with a convex portion having a shape corresponding to the circumferential groove 6, and the parison in the mold presses against this convex portion at the time of direct blow molding. It will be stretched. For this reason, as shown in FIG. 2A, the thickness of the circumferential groove 6 is such that the groove bottom wall 9, the upper edge 12 serving as the boundary between the body 4 and the upper wall 7, and the body 4 and the lower wall. 8 is thinned at the lower edge portion 13 which becomes the boundary with 8.

  Next, heating filling using the bottle 1 of the present embodiment will be described. After filling the heated contents into the filling space M, when the cap (not shown) is attached to the mouth portion 2, the filling space M is sealed. Then, when the bottle is cooled by leaving the bottle filled with the contents or by pouring water (or hot water having a low temperature) on the outside of the bottle 1, the filling space M is in a decompressed state. Here, in the circumferential groove 6, the thickness of the groove bottom wall 9, the upper edge portion 12, and the lower edge portion 13 is thin, and these portions are easily bent. Therefore, as shown in FIG. 2B, the upper wall 7 and the lower wall 8 move like a hinge with the groove bottom wall 9 as a fulcrum, and the opening 10 of the circumferential groove 6 is narrowed. That is, as the groove width Wa of the opening 10 is reduced, the height of the bottle 1 is reduced and the volume of the filling space M is reduced, so that the decompression of the filling space M can be absorbed.

  When the upper wall 7 is extended in a substantially horizontal direction and the lower wall 8 is inclined and extended toward the upper wall 7 as in the present embodiment, the lower wall 8 has a longer extension length. The wall thickness tends to be reduced by direct blow molding. As a result, the lower wall 8 can easily move in a reduced pressure state, so that the reduced pressure absorption function can be more reliably exhibited. The lower wall 8 may extend in the horizontal direction, and the upper wall 7 may be inclined toward the lower wall 8.

  In the bottle 1 of the present embodiment, the upper wall 7 extends in a substantially horizontal direction and the lower wall 8 is inclined, so that the groove width Wa of the opening 10 is wider than the groove width Wb of the groove bottom 11. . For this reason, it will be excellent in the mold release property from a metal mold | die, and the yield rate in direct blow molding can be raised.

  In the bottle 1 of this embodiment, the shoulder 3 is connected to the mouth 2, and the cylindrical body 4 having substantially the same diameter is connected to the mouth 2. However, in the present invention, the shape is arbitrary, For example, an egg-shaped body part may be connected to the mouth part, or a bowl-shaped body part may be connected to the mouth part. Moreover, although the circumferential groove 6 of this embodiment is provided near the bottom 5 of the trunk 4, the position thereof is arbitrary in the present invention, and may be provided at the approximate center of the trunk 4 or near the mouth 2. May be provided. Further, a plurality of circumferential grooves 6 may be provided, and these may be provided adjacent to each other or may be provided separately.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the novel heat filling bottle which does not have a big influence on an external appearance design, and can fully exhibit a reduced pressure absorption function even with a small bottle.

DESCRIPTION OF SYMBOLS 1 Bottle 2 Mouth part 3 Shoulder part 4 Trunk part 5 Bottom part 6 Circumferential groove 7 Upper wall 8 Lower wall 9 Groove bottom wall 10 Opening 11 Groove bottom 12 Upper edge part 13 Lower edge part M Filling space Wa Groove on the trunk | drum surface side Width (opening width)
Wb Groove width on the filling space side (groove bottom width)

Claims (2)

In the hot-fill bottle formed by direct blow molding, which has a filling space formed inside the body portion and can fill the heated contents in the filling space,
The trunk portion has a circumferential groove in which the trunk portion is recessed toward the filling space;
The heat filling bottle, wherein the circumferential groove has a narrow groove width on the filling space side with respect to a groove width on the body surface side.   The circumferential groove is opposed to the upper wall extending in a substantially horizontal direction from the body surface side toward the filling space side, and approaches the upper wall from the body surface side toward the filling space side. The heat filling bottle according to claim 1, comprising a lower wall that is inclined in a direction and a groove bottom wall that connects the upper wall and the lower wall to form a groove bottom.

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