JP2011031899A - Plastic bottle for warming - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plastic bottle for warming which can keep its appearance fine when being warmed and when being cooled after being warmed even if the bottle has a thin-walled structure. <P>SOLUTION: The plastic bottle 10 for warming includes a mouth 11, a trunk 20, and a bottom 30. The trunk 20 has a substantially-cylindrical shape having a cylindrical face 21. Six panels 23 are arranged at the cylindrical face 21 of the trunk 20 along the circumference direction at equal intervals recessed toward the trunk 20. The total volume of the six panels 23 is determined to be 30 to 50 ml, and the depth d<SB>1</SB>of each panel 23 is determined to be 4.0 to 8.0 mm. This allows the plastic bottle to keep its appearance fine when being warmed and when being cooled after being warmed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a warming plastic bottle, and more particularly to a warming plastic bottle for beverages that are warmed in a hot warmer or a vending machine.

  In recent years, plastic bottle containers for beverages and the like have become common, and such plastic bottle containers are increasingly used for heated beverages.

  The performance required for such a plastic bottle for warming is that the bottle appearance is not impaired during warming. Therefore, the plastic bottle for heating is restricted by the bottle shape. Specifically, when the bottle is heated and the contents liquid and the head space expand, it is necessary not to deteriorate the appearance of the bottle.

  Further, as a phenomenon peculiar to such a heating plastic bottle, there is a phenomenon that the heated bottle is left as it is without opening and is cooled. When the bottle is cooled after being heated in this way, the volume of the contents is reduced, so that the bottle internal pressure is reduced. Even in this case, it is required to prevent a visually significant difference between the bottle shapes before and after cooling. Therefore, the plastic bottle for heating needs to further have a reduced pressure absorption function.

  Generally, regardless of whether it is a heat-resistant bottle or a non-heat-resistant bottle, the plastic bottle has a shape (panel) that can withstand decompression. However, when the shape is damaged by heating, the pressure cannot be withstood and the appearance is impaired.

  For the above reasons, heat-resistant bottles are generally used for heated plastic bottles. The shape is sufficient to eliminate a significant difference in the bottle shape before and after heating).

  On the other hand, aseptic methods for producing bottled beverage products exist. In this aseptic filling method, a technique is employed in which a plastic bottle (aseptic bottle) is sterilized with a drug in an aseptic environment, and then the sterilized plastic bottle is filled with the content liquid at room temperature. When such an aseptic filling method is used, the plastic bottle is not exposed to high temperatures in the manufacturing process. Therefore, as a plastic bottle for aseptic filling, a bottle having low heat resistance (non-heat resistant bottle) is generally used. However, since such a non-heat-resistant bottle is lighter and thinner than a heat-resistant bottle, deformation occurs with changes in the bottle internal pressure, and the appearance is likely to be impaired.

JP 2006-264721 A

  The present invention has been made in consideration of such points, and even when the bottle is thin, the bottle appearance is favorably maintained both during heating and during cooling after heating. An object is to provide a warming plastic bottle that can be heated.

  The present invention is a heating plastic bottle, comprising a mouth portion, a body portion, and a bottom portion, the body portion having a substantially cylindrical shape having a cylindrical surface, along the circumferential direction of the cylindrical surface of the body portion. Six panel parts recessed inwardly at the body part are formed at equal intervals, the total volume of the six panel parts is 30 ml to 50 ml, and the depth of each panel part is 4.0 mm to 8.0 mm. It is a plastic bottle for heating.

  The present invention is a plastic bottle for heating characterized in that columnar portions are formed between adjacent panel portions of a cylindrical surface, and the width of each columnar portion is 0.0 mm to 3.0 mm. is there.

  The present invention is the plastic bottle for heating, wherein each panel portion has a flat bottom surface that is not curved and a side wall surface that surrounds the bottom surface.

  The present invention is the heating plastic bottle characterized in that each panel portion has a bottom surface curved toward the inside of the body portion and a side wall surface surrounding the bottom surface.

  This invention is a plastic bottle for heating characterized by the average wall thickness being 0.20 mm to 0.48 mm.

  The present invention is the heating plastic bottle characterized in that the total height of the container is 150 mm to 160 mm and the trunk diameter of the container is 65 mm to 70 mm.

  According to the present invention, the total volume of the six panel portions is set to 30 ml to 50 ml, and the depth of each panel portion is set to 4.0 mm to 8.0 mm. Therefore, either during heating or during cooling after heating. Even the bottle appearance can be maintained well.

FIG. 1 is a front view showing a plastic bottle for heating according to an embodiment of the present invention. FIG. 2 is a top view showing a plastic bottle for heating according to an embodiment of the present invention. FIG. 3 is a bottom view showing a plastic bottle for heating according to an embodiment of the present invention. FIG. 4 is a horizontal sectional view (sectional view taken along line IV-IV in FIG. 1) showing a plastic bottle for heating according to an embodiment of the present invention. FIG. 5 is a horizontal sectional view showing a modified example of the plastic bottle for heating. FIG. 6 is a horizontal sectional view showing the operation of the warming plastic bottle according to the embodiment of the present invention. 7 is a front view showing a plastic bottle of Comparative Example 1. FIG. 8 is a horizontal cross-sectional view showing the plastic bottle of Comparative Example 1 (cross-sectional view taken along the line VIII-VIII in FIG. 7).

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 6 show an embodiment of the present invention.

  First, an outline of a plastic bottle for heating according to the present embodiment will be described with reference to FIGS.

  The heating plastic bottle 10 shown in FIGS. 1 to 4 is a non-heat-resistant bottle used in an aseptic filling method. The heating plastic bottle 10 includes a mouth portion 11, a shoulder portion 12 provided below the mouth portion 11, a trunk portion 20 provided below the shoulder portion 12, and a bottom portion 30 provided below the trunk portion 20. And.

  Among these, the trunk | drum 20 has the cylindrical surface 21, and consists of a substantially cylindrical shape as a whole. On the cylindrical surface 21 of the trunk portion 20, six panel portions 23 are formed that are recessed inwardly of the trunk portion 20 at equal intervals along the circumferential direction. Further, columnar portions 22 are formed between the adjacent panel portions 23 of the cylindrical surface 21.

  Each panel part 23 has the bottom face 23a and the side wall surface 23b surrounding the bottom face 23a. Of these, the bottom surface 23a is not provided with irregularities such as ribs, and has a gentle shape. As shown in FIG. 4, in the horizontal section of the body portion 20, the bottom surface 23 a of the panel portion 23 has a flat shape that is not curved.

  As in the modification shown in FIG. 5, the bottom surface 23 a of the panel portion 23 may have a shape curved toward the inside of the body portion 20 in the horizontal section of the body portion 20. In this case, the reduced pressure absorption function of the panel unit 23 can be further enhanced.

  In the present embodiment shown in FIGS. 1 to 5, the total volume of the six panel portions 23 is 30 to 50 ml. If the total volume of the six panel portions 23 is less than 30 ml, the volume of each panel portion 23 is too small, so that the bottom surface 23a of the panel portion 23 expands outward during heating, which may impair the bottle appearance. is there. Moreover, since the reduced pressure absorption function of the warming plastic bottle 10 becomes insufficient, when cooled after warming, the inside of the bottle may be depressurized and the body 20 may be bent. On the other hand, if the total volume of the six panel parts 23 exceeds 50 ml, the columnar part 22 will be whitened due to poor shaping or overstretching during blow molding.

The depth _{d 1} of each panel 23 (see FIGS. 4 and 5) has a 4.0Mm～8.0Mm. If the depth d ₁ of each panel section 23 is less than 4.0 mm, since the volume of each panel section 23 is too small, the bottom surface 23a of the panel 23 when warming will expand outward, the bottle appearance There is a risk of damage. Moreover, since the reduced pressure absorption function of the warming plastic bottle 10 becomes insufficient, when cooled after warming, the inside of the bottle may be depressurized and the body 20 may be bent. On the other hand, when the depth d ₁ of each panel portion 23 exceeds 8.0 mm, whitening due to vehicle defects or overstretching occurs in column 22 at the time of blow molding. Note the depth d ₁ of each panel section 23, it refers to the maximum distance to the bottom surface 23a of each panel section 23 from the cylindrical surface 21 (see FIGS. 4 and 5).

In Figure 1, the height _{h 1} of each panel 23 and 50 to 100 mm, it is preferable that the width _{w 1} of each panel section 23 and 28Mm～32mm. Further, it is preferable that the width _{w 2} of the columnar portion 22 is a 0.0Mm～3.0Mm. If the width w ₂ exceeds 3.0 mm, since the panel portion 23 is reduced, according to the embodiment of maintaining a good bottle appearance in any of the cooling after the heating time and heating It is difficult to obtain the effect.

The size of the heating plastic bottle 10 is not limited, and may be any size bottle. For example, the volume of the heating plastic bottle 10 may be 280 to 350 ml. In particular, when the total height h ₂ (see FIG. 1) of the container is 150 mm to 160 mm and the trunk diameter w ₃ (see FIG. 1) of the container is 65 mm to 70 mm, the effects of the present embodiment are suitably obtained. Can do.

In this embodiment also, the total volume of the six panels 23 as described above and 30Ml～50ml, has a depth _{d 1} of each panel section 23 and 4.0Mm～8.0Mm. This makes it possible to maintain a good bottle appearance both when heating and when cooling after heating, particularly when the heating plastic bottle 10 is formed thin. Specifically, the average thickness of the heating plastic bottle 10 can be reduced to 0.20 mm to 0.48 mm. The average wall thickness of the heating plastic bottle 10 is “average wall thickness” = “weight of the heating plastic bottle 10 (excluding the mouth portion 11)” / {“surface area of the heating plastic bottle 10 ( It can be calculated based on the equation: “excluding the mouth portion 11)” × “specific gravity of plastic material (1.335 in the case of PET)”}.

  Such a warming plastic bottle 10 can be produced by biaxially stretch-blowing a preform produced by injection molding a synthetic resin material. Note that it is preferable to use a thermoplastic resin, in particular, PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), or PEN (polyethylene naphthalate) as a material for the preform, that is, the warming plastic bottle 10.

  Further, the warming plastic bottle 10 may be formed as a multilayer molded bottle having two or more layers. That is, by extrusion molding or injection molding, for example, the intermediate layer has gas barrier properties and light shielding properties such as MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer) or PEN (polyethylene naphthalate). A multilayer bottle having gas barrier properties and light-shielding properties may be formed by extrusion molding a preform composed of three or more layers as the resin (intermediate layer), and then blow-molding it. In addition, it is preferable to provide such an intermediate | middle layer in the trunk | drum 20 at least among the plastic bottles 10 for a heating. Further, it is preferable to provide an intermediate layer in the region of the bottom portion 30 excluding the central portion of the bottom portion 30. This is because this portion may cause delamination (delamination) when subjected to an impact such as a case dropping. In order to have gas barrier properties and light shielding properties, a blend bottle in which thermoplastic resins are blended may be formed as well as multilayers.

  Next, the operation of the present embodiment having such a configuration will be described.

  First, the heating plastic bottle 10 is filled with a content liquid such as green tea or coffee, and then sealed. Furthermore, a label such as a shrink film is attached around the body 20. Thereafter, the warming plastic bottle 10 is sold in a heated state in a hot warmer or a vending machine.

  At this time, by heating the plastic bottle 10 for heating, the content liquid is also heated, and the volume of the content liquid is increased. Thereby, the bottle internal pressure of the plastic bottle 10 for heating increases. Moreover, the trunk | drum 20 expand | swells because the bottle internal pressure of the plastic bottle 10 for a heating increases.

  In this case, as shown in FIG. 6, each panel part 23 of the trunk | drum 20 swells toward the trunk | drum 20 outward. In the present embodiment, as described above, the total volume of the six panel portions 23 is 30 ml to 50 ml, and the depth of each panel portion 23 is 4.0 mm to 8.0 mm. Since the volume of each panel portion 23 is increased in this way, each panel portion 23 may protrude outward from the cylindrical surface 21 even when the bottle internal pressure increases and each panel portion 23 swells outward. No (refer to the two-dot chain line in FIG. 6). Further, the position of the label L is hardly changed. Thereby, the bottle external appearance at the time of heating can be maintained favorable.

  On the other hand, it is also conceivable that the heated plastic bottle 10 for heating is left as it is at room temperature without being opened and cooled. When the bottle is cooled after being heated in this way, the volume of the content is reduced, and thus the bottle internal pressure of the heating plastic bottle 10 is reduced.

  In this case, each panel part 23 swelled by heating is recessed toward the inside of the body part 20 (see the solid line in FIG. 6). In the present embodiment, as described above, the volume of each panel portion 23 is increased. Accordingly, when the inner pressure of the bottle decreases and each panel portion 23 is recessed inward, each panel portion 23 absorbs the reduced pressure portion, so that the body portion 20 is not bent. And since the panel part 23 is arrange | positioned inside the label L, the recessed panel part 23 is not conspicuous in appearance. Therefore, even when the plastic bottle 10 for heating is cooled after heating, the bottle appearance can be maintained satisfactorily.

As described above, according to the present embodiment, the total volume of the six panel portions 23 is set to 30 to 50 ml, and the depth d ₁ of each panel portion 23 is set to 4.0 mm to 8.0 mm. Therefore, the bottle appearance can be maintained well both during heating and during cooling after heating. In particular, even when the bottle is thin (for example, when the average thickness is 0.20 mm to 0.48 mm), the appearance of the bottle can be maintained well.

  Moreover, according to this Embodiment, the plastic bottle 10 for a heating can be comprised from a non-heat-resistant bottle. That is, since the aseptic filling method can be adopted as the filling method of the content liquid, the flavor of the content liquid in the bottle is not impaired, and the production cost can be reduced.

  Next, specific examples in the present embodiment will be described.

  First, the following three types of plastic bottles (Example 1, Example 2, and Comparative Example 1) were produced.

Example 1
A 350 ml warming plastic bottle 10 (Example 1) having the structure shown in FIGS. 1 to 4 was produced. In this case, the total volume of the six panel portions 23 was 32 ml, and the depth d ₁ of each panel portion 23 was 4.3 mm.

Further, in this heating plastic bottle 10 (Example 1), the height h ₁ of each panel portion 23 is 63 mm, the width w ₁ of each panel portion 23 is 30 mm, the total height h ₂ of the container is 153 mm, and the body diameter w ₃ was 68.5 mm, and the width w ₂ of each columnar portion 22 was 3.0 mm.

(Example 2)
Next, a 350 ml warming plastic bottle 10 (Example 2) having the structure shown in FIG. 5 was produced. In this case, the total volume of the six panel portions 23 was 43 ml, and the depth d ₁ of each panel portion 23 was 6.0 mm.

In this heating plastic bottle 10 (Example 2), the height h ₁ of each panel portion 23 is 68 mm, the width w ₁ of each panel portion 23 is 30 mm, the total height h ₂ of the container is 153 mm, and the body diameter w ₃ was 68.5 mm, and the width w ₂ of each columnar portion 22 was 2.7 mm.

(Comparative Example 1)
Next, a 350 ml plastic bottle 50 (Comparative Example 1) having the structure shown in FIGS. 7 and 8 was produced. As shown in FIGS. 7 and 8, the plastic bottle 50 (Comparative Example 1) has a mouth portion 51, a shoulder portion 52, a trunk portion 53, and a bottom portion 54. In addition, six panel portions 56 are formed on the cylindrical surface 55 of the body portion 53. In this case, the total volume of the six panels 56 is 25 ml, the depth _{d 2} of each panel portion 23 was 3.1 mm.

In this plastic bottle 50 (Comparative Example 1), the height h ₃ of each panel portion 56 is 61 mm, the width w ₄ of each panel portion 56 is 28 mm, the total height h ₄ of the container is 157 mm, and the trunk diameter w ₅ is 66. The width w ₆ of each columnar part 57 was 4.2 mm.

(Change during heating)
The above three types of plastic bottles (Example 1, Example 2, and Comparative Example 1) were each filled with the contents liquid and then sealed. Thereafter, three types of plastic bottles (Example 1, Example 2, and Comparative Example 1) were each heated in a thermostatic bath at 70 ° C.

  As a result, the amount of increase in the body diameter of the warming plastic bottle 10 of Example 1 was 3.2 mm, and the bottle appearance was well maintained.

  Further, the amount of increase in the body diameter of the warming plastic bottle 10 of Example 2 was 2.8 mm, and the bottle appearance was well maintained.

  On the other hand, the increase in the body diameter of the plastic bottle 50 of Comparative Example 1 was 3.6 mm, and the bottle appearance was damaged.

(Changes when left unopened)
Subsequently, the three types of plastic bottles (Example 1, Example 2, and Comparative Example 1) were left unopened at room temperature, and the respective temperatures were lowered.

  As a result, the heating plastic bottle 10 of Example 1 continued to maintain a good bottle appearance.

  In addition, the warming plastic bottle 10 of Example 2 continued to maintain a good bottle appearance.

  On the other hand, in the plastic bottle 50 of Comparative Example 1, the upper portion of the body portion 53 was depressed, and the appearance of the bottle was damaged.

  Therefore, the warming plastic bottle 10 (Example 1 and Example 2) according to the present embodiment maintains a good bottle appearance both during heating and during cooling after heating. Was confirmed.

DESCRIPTION OF SYMBOLS 10 Plastic bottle for heating 11 Mouth part 12 Shoulder part 20 Body part 21 Cylindrical surface 22 Columnar part 23 Panel part 23a Bottom face 23b Side wall surface 30 Bottom part

Claims (6)

In plastic bottles for heating,
The mouth,
The torso,
With a bottom,
The trunk portion has a substantially cylindrical shape having a cylindrical surface,
Six panel parts are formed on the cylindrical surface of the trunk part, which are recessed inwardly of the trunk part at equal intervals along the circumferential direction.
A heating plastic bottle characterized in that the total volume of the six panel portions is 30 ml to 50 ml, and the depth of each panel portion is 4.0 mm to 8.0 mm.   The heating plastic bottle according to claim 1, wherein columnar portions are formed between adjacent panel portions of the cylindrical surface, and the width of each columnar portion is 0.0 mm to 3.0 mm. .   The heating plastic bottle according to claim 1 or 2, wherein each panel portion has a flat bottom surface and a side wall surface surrounding the bottom surface.   The heating plastic bottle according to claim 1 or 2, wherein each panel portion has a bottom surface curved toward the inside of the body portion and a side wall surface surrounding the bottom surface.   The plastic bottle for heating according to any one of claims 1 to 4, wherein an average thickness is 0.20 mm to 0.48 mm.   The plastic bottle for heating according to any one of claims 1 to 5, wherein the overall height of the container is 150 mm to 160 mm, and the body diameter of the container is 65 mm to 70 mm.

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