JP5893401B2 - Plastic bottle - Google Patents

Description

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

  Recently, plastic bottles for beverages and the like have become common, and such plastic bottles are also increasingly used for heated beverages.

  The performance required for such a plastic bottle for heating is that the bottle appearance is not impaired during heating.

  By the way, as a method for producing a bottled beverage product, an aseptic filling method exists. This aseptic filling method employs a technique in which a plastic bottle is sterilized with a drug in an aseptic environment, and then the sterilized plastic bottle is filled with a 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, generally a bottle having low heat resistance (non-heat-resistant molded bottle) is used. However, since such a non-heat-resistant molded bottle is lighter and thinner than a heat-resistant molded bottle, deformation occurs with changes in the bottle internal pressure, and the appearance tends to be impaired.

JP 2006-264721 A

  The present invention has been made in consideration of such points, and even when a thin-walled non-heat-resistant molded bottle is used as a beverage bottle, the bottle is not used after filling the non-heat-resistant molded bottle with the content liquid. An object of the present invention is to provide a warming plastic bottle capable of maintaining a good bottle appearance when heated.

The present invention is a plastic bottle, comprising a mouth portion, a body portion, and a bottom portion, the body portion having a quadrangular tubular shape having four side surfaces extending from the lower portion to the upper portion of the body portion , and each side surface is vertically long. Each of the four sides of the rectangular shape that constitutes the side surface, and a peripheral portion composed of four peripheral trapezoids extending inwardly from each of the four sides of the rectangular shape, and inward from the inner edge of each peripheral trapezoid It is a plastic bottle characterized by having an intermediate portion made of an intermediate trapezoid extending in an inclined manner and a flat central portion having a vertically long rectangular shape surrounded by each intermediate trapezoid of the intermediate portion.

  The present invention is a plastic bottle characterized in that the ratio a / H between the maximum diameter a of the body portion and the total height H of the plastic bottle is 0.45 or less.

  The present invention is a plastic bottle characterized in that the ratio h / H between the height h of each side surface and the total height H of the plastic bottle is 0.65 or more.

  The present invention is a plastic bottle characterized in that the ratio b / a between the minimum diameter b of the body and the maximum diameter a of the body is 0.80 or less.

  According to the present invention, each side surface of the body portion has a vertically long rectangular shape, and each side surface has a peripheral portion composed of four peripheral trapezoids extending inwardly from each of the four sides, and an inner end of each peripheral trapezoid It has an intermediate portion formed of an intermediate trapezoid extending inwardly from the edge, and a central portion having a vertically long rectangular shape surrounded by the intermediate trapezoids of the intermediate portion. For this reason, when a plastic bottle is heated, the center part of each side surface does not protrude greatly outward, and the bottle appearance can be maintained satisfactorily.

Fig.1 (a) is a front view which shows the plastic bottle by one Embodiment of this invention, FIG.1 (b) is the front view seen from the angle different from Fig.1 (a) which shows a plastic bottle. FIG. 2 is a perspective view showing a plastic bottle according to an embodiment of the present invention. FIG. 3 is a bottom view showing a plastic bottle according to an embodiment of the present invention. FIG. 4 is a top view showing a plastic bottle according to an embodiment of the present invention. FIG. 5A is a front view showing a plastic bottle as a comparative example, and FIG. 5B is a front view seen from an angle different from FIG. 5A showing the plastic bottle. FIG. 6A is a front view showing a plastic bottle as another comparative example, and FIG. 6B is a front view seen from a different angle from FIG. 6A showing the plastic bottle. FIGS. 7A and 7B are diagrams showing a manufacturing process of a non-heat-resistant molded bottle and a heat-resistant molded bottle.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 4 are views showing an embodiment of the present invention.

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

  A plastic bottle 10 shown in FIGS. 1 to 4 is a non-heat-resistant molded bottle used in an aseptic filling method. Here, the non-heat-resistant molded bottle has a mouth portion 11 to be described later made of an amorphous transparent body, and the mouth portion 11 is sterilized by a chemical agent so that it is not exposed to high temperatures and has no heat resistance. (See FIG. 7 (a)).

  When producing a non-heat-resistant molded bottle, first, a metal mold | die is heated and primary blow molding and secondary blow molding are performed sequentially. Next, the inside of the mold is exhausted without cooling blow.

  In producing the non-heat-resistant molded bottle, the mold temperature is set to less than 90 ° C., and the production efficiency is increased by the absence of the cooling blow process.

  On the other hand, the heat-resistant molded bottle is made of a white body with the mouth portion 11 crystallized, and heat resistance is required to sterilize the mouth portion 11 with a high-temperature content liquid (see FIG. 7B).

  When producing a heat-resistant molded bottle, the mold is first heated, and primary blow molding and secondary blow molding are sequentially performed. Next, cooling blow is performed while exhausting the inside of the mold immediately after the secondary blow molding so as not to shrink after the mold release.

  In producing the heat-resistant molded bottle, the mold temperature is set to 90 ° C. or more, and the production time becomes long because of the cooling blow process.

  Such a non-heat-resistant molded plastic bottle 10 for heating includes a mouth part 11, a shoulder part 12 provided below the mouth part 11, a body part 20 provided below the shoulder part 12, and a body part 20 below. And a bottom portion 30 provided on the bottom.

  Among these, the trunk | drum 20 has several, for example, four side surfaces 21 which consist of mutually the same shape, and consists of a substantially polygonal cylinder shape, for example, a square cylinder shape as a whole. Further, a flat boundary surface 22 is formed between the adjacent side surfaces 21.

  Each side surface 21 has a vertically long rectangular shape. Further, each side surface 21 includes a peripheral edge 25 composed of four peripheral trapezoids 25a extending inwardly from each of the four sides 21a, and an intermediate trapezoid 26a extending inwardly from an inner edge 25b of each peripheral trapezoid 25a. And a flat central portion 27 surrounded by the intermediate trapezoids 26a of the intermediate portion 26. Of these, the central portion 27 surrounded by the intermediate trapezoids 26a is a vertically long rectangular shape. Have

  Furthermore, the bottom part 30 has a peripheral part 31 and a central part 32 that is located at the center of the peripheral part 31 and is lifted upward from the peripheral part 31.

  Such a non-heat-resistant molded plastic bottle 10 for heating can be produced by biaxially stretch blow-molding a preform manufactured by injection molding a synthetic resin material. In addition, it is preferable to use a thermoplastic resin, especially PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate) as a material of the preform, that is, the plastic bottle 10.

  The plastic bottle 10 can also 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. Such an intermediate layer is preferably provided in at least the body 20 of the plastic bottle 10. 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, each shape of the plastic bottle 10 will be described.

  The plastic bottle 10 is formed in an elongated shape in the vertical direction, and the total height of the plastic bottle 10 is H.

  Further, the maximum diameter of the body portion 20 of the plastic bottle 10, that is, the distance between the opposing boundary surfaces 22 is a, and the minimum diameter of the body portion 20, that is, the distance between the opposing side surfaces 21 is b ( (See FIG. 4).

  Furthermore, the height of the side surface 21 of the trunk portion 20 is h.

  In this case, the ratio a / H between the maximum diameter a of the body 20 and the total height H of the plastic bottle 10 is 0.45 or less, and thus the plastic bottle 10 is formed in an elongated shape in the vertical direction. . The ratio h / H between the height h of the side surface and the total height H of the plastic bottle 10 is 0.65 or more. Further, the ratio b / a between the minimum diameter b of the body portion 20 and the maximum diameter a of the body portion 20 is 0.80 or less.

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

  First, the plastic bottle 10 is filled with a content liquid such as green tea or coffee, and then sealed.

  Thus, the content liquid can be filled in the plastic bottle 10 by filling the plastic bottle 10 with the content liquid and then sealing it.

  Next, a label such as a shrink film is attached around the body 20. Thereafter, the plastic bottle 10 is sold in a heated state in a hot warmer or a vending machine.

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

  In this case, each side surface 21 of the body portion 20 bulges outward (also referred to as the outside) of the body portion 20, and each boundary surface 22 corresponds to the expansion of the side surface 21, and the inside of the body portion 20 (also referred to as the inside). Curve toward.

  By the way, each side surface 21 of the body portion 20 is inclined inward from the peripheral edge portion 25 composed of four peripheral trapezoids 25a extending inwardly from each of the four sides 21a, and from the inner edge 25b of each peripheral trapezoid 25a. The intermediate portion 26 includes an intermediate trapezoid 26a that extends, and a flat central portion 27 that is surrounded by four intermediate trapezoids 26a of the intermediate portion 26 and has a vertically long rectangular shape. In this way, the intermediate trapezoid 26a of each side surface 21 is drawn inward of the barrel 20 from the peripheral trapezoid 25a, and the flat central portion 27 is further drawn inward of the barrel 20 from the intermediate trapezoid 26a. For this reason, even when the plastic bottle 10 is heated and each side surface 21 of the body portion 20 bulges outward from the body portion 20, the flat central portion 27 of each side surface 21 is greatly outward from the body portion 20. Even if the plastic bottle 10 is heated, the appearance of the bottle can be maintained satisfactorily.

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

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

Example 1
A 270 ml plastic bottle 10 having the configuration shown in FIGS. 1 to 4 was produced.

  In this case, a 22.7 g PET single layer pull foam was first produced by injection molding, and a 270 ml square cylindrical plastic bottle 10 was produced by biaxial stretch blow molding.

  The plastic bottle 10 was filled with the content liquid at 15 ° C. and 40 ° C., and the central portion 32 of the bottom 30 was pushed up to seal the plastic bottle 10 tightly. The plastic bottle 10 filled with the contents at 40 ° C. was then cooled to room temperature.

  Thereafter, each of the plastic bottles 10 filled at 15 ° C. and 40 ° C. was subjected to a hot water bath at 75 ° C. for 60 minutes, and the amount of dimensional change of the plastic bottle 10 was measured before and after the hot water bath to evaluate the heat resistance.

  The plastic bottle 10 of Example 1 was set to shape A.

(Comparative Example 1)
A 270 ml plastic bottle 10 having the structure shown in FIGS. 5 (a) and 5 (b) was produced.

  The plastic bottle 10 shown in FIGS. 5 (a) and 5 (b) is substantially the same as the plastic bottle 10 according to the present invention shown in FIGS.

  That is, the body portion 20 of the plastic bottle 10 has four side surfaces 21, and each side surface 21 is provided with a peripheral portion 37, a panel 35 provided at the center of the peripheral portion 37, and separated from the peripheral portion 37 via the peripheral groove 36. have. Further, on each side surface 21, a reinforcing groove 38 is provided above and below the panel 35.

  In this case, a 22.7 g PET single-layer preform was first produced by injection molding, and a 270 ml square cylindrical plastic bottle 10 was produced by biaxial stretch blow molding.

  The plastic bottle 10 was filled with contents at 15 ° C. and 40 ° C., and the plastic bottle 10 was sealed.

  The plastic bottle filled with the contents at 40 ° C. was then cooled to room temperature.

  Thereafter, each of the plastic bottles 10 filled at 15 ° C. and 40 ° C. was subjected to a hot water bath at 75 ° C. for 60 minutes, and the amount of dimensional change of the plastic bottle 10 was measured before and after the hot water bath to evaluate the heat resistance.

  The plastic bottle 10 of the comparative example 1 was made into the shape B.

(Comparative Example 2)
A 270 ml plastic bottle 10 having the structure shown in FIGS. 6 (a) and 6 (b) was produced.

  The plastic bottle 10 shown in FIGS. 6A and 6B is substantially the same as the plastic bottle 10 shown in FIGS. 1 to 4 except that the side surface 21 of the trunk portion 20 is different.

  That is, the body portion 20 of the plastic bottle 10 has four side surfaces 21, and each side surface 21 is provided in the center of the peripheral edge portion 40 and the peripheral edge portion 40, and is arranged in the vertical direction that falls from the peripheral edge portion 40 through the inclined surface 38. And two panels 35a and 35b. The two panels 35a and 35b arranged in the vertical direction are separated by a horizontal protrusion rib 41 having the same height as the peripheral edge 40, and a reinforcing groove 39 is provided above and below the two upper and lower panels 35a and 35b. Is provided.

  In this case, a 22.7 g PET single-layer preform was first produced by injection molding, and a 270 ml square cylindrical plastic bottle 10 was produced by biaxial stretch blow molding.

  The plastic bottle 10 was filled with contents at 15 ° C. and 40 ° C., and the plastic bottle 10 was sealed.

  The plastic bottle filled with the contents at 40 ° C. was then cooled to room temperature.

  Thereafter, each of the plastic bottles 10 filled at 15 ° C. and 40 ° C. was subjected to a hot water bath at 75 ° C. for 60 minutes, and the amount of dimensional change of the plastic bottle 10 was measured before and after the hot water bath to evaluate the heat resistance.

  The plastic bottle 10 of Comparative Example 2 was shaped as C.

(Evaluation of heat resistance)
As described above, the plastic bottles 10 filled with the contents liquid under the filling conditions of 15 ° C. and 40 ° C. for the shapes A, B, and C were prepared for each n = 5 samples.

  Next, Table 1 shows the amount of dimensional change of the plastic bottle 10 caused by hot water.

In Table 1, each change in the total height H of the bottle 10, the maximum diameter a (diagonal) of the barrel 20, the minimum diameter b (facing) of the barrel 20, and the height (gate) of the central portion 32 of the base 30. Indicates the amount.

  As is clear from Table 1, the plastic bottle 10 (shape A) according to the present invention has a smaller bulge of the body portion 20 during heating than the plastic bottle 10 according to Comparative Example 1-2, and in particular, the side surface of the body portion 20. The facing distance between 21 does not swell greatly.

  For this reason, in the plastic bottle 10 by this invention, even when the bottle 10 was heated, the bottle external appearance was able to be maintained favorable.

DESCRIPTION OF SYMBOLS 10 Plastic bottle 11 Mouth part 12 Shoulder part 20 Body part 21 Side surface 21a Side 22 Boundary surface 25 Peripheral part 25a Perimeter trapezoid 25b Inner edge 26 Middle part 26a Intermediate trapezoid 27 Central part 30 Bottom part 31 Peripheral part 32 Central part

Claims (4)

In plastic bottles,
The mouth,
The torso,
With a bottom,
The trunk portion has a rectangular tube shape having four side surfaces extending from the lower portion to the upper portion of the trunk portion ,
Each side surface has a vertically long rectangular shape, and each side surface has a peripheral portion composed of four peripheral trapezoids extending inwardly from each of the four rectangular sides constituting the side surface, and an inner edge of each peripheral trapezoid A plastic bottle comprising: an intermediate portion formed of an intermediate trapezoid extending inwardly from the center; and a flat central portion having a vertically long rectangular shape surrounded by the intermediate trapezoids of the intermediate portion.   2. The plastic bottle according to claim 1, wherein a ratio a / H between the maximum diameter a of the body portion and the total height H of the plastic bottle is 0.45 or less.   3. The plastic bottle according to claim 1, wherein a ratio h / H between a height h of each side surface and a total height H of the plastic bottle is 0.65 or more.   4. The plastic bottle according to claim 1, wherein a ratio b / a between a minimum diameter b of the body portion and a maximum diameter a of the body portion is 0.80 or less.

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