JP2013023227A - Heat labile molded plastic bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat labile molded plastic bottle which is capable of keeping excellent appearance of the plastic bottle when the plastic bottle is heated even if the plastic bottle is thin-walled, and capable of preventing a peripheral edge thereof from being bent when a bottom part thereof is pushed up.SOLUTION: The heat labile molded plastic bottle 10 includes a mouth part 11, a barrel part 20 and a bottom part 30. The barrel part 20 has a substantially square prismatic shape having four side faces 21, a boundary surface 22 is formed between the barrel parts 20, and a plurality of barrel part recessed ribs 25a, 25b, 25c extending in the axial direction of the barrel part 20 are provided on the boundary surface 22. The bottom part 30 includes a peripheral edge part 31 and a center part 32 lifted from the peripheral edge part 31, and a plurality of bottom part recessed ribs 33 are provided on the peripheral edge part 31.

Description

  The present invention relates to a non-heat-resistant molded plastic bottle for heating, and more particularly to a non-heat-resistant molded plastic bottle for heating such as for beverages heated in a hot warmer or a vending machine.

  Recently, plastic bottles for beverages and the like have become common, and such plastic bottles are 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 non-heat-resistant molded plastic bottle for heating that can maintain a good bottle appearance when heated.

  The present invention relates to a non-heat-resistant molded plastic bottle, comprising a mouth portion, a trunk portion, and a bottom portion, the trunk portion having a substantially polygonal cylinder shape having a plurality of side surfaces, and between the adjacent side surfaces of the trunk portion. Each of the boundary surfaces is formed, and each of the boundary surfaces is provided with a plurality of trunk concave ribs that are drawn inward and extend in the axial direction of the trunk, and among these, the pair of trunk concave ribs is a side surface adjacent to the boundary surface. It is a non-heat-resistant molded plastic bottle characterized by being located on a pair of ridgeline between.

  The present invention relates to a non-heat-resistant molded plastic bottle, comprising a mouth portion, a body portion, and a bottom portion, the body portion having a substantially polygonal cylinder shape having a plurality of side surfaces, the bottom portion being a peripheral portion and the center of the peripheral portion. A non-heat-resistant molded plastic bottle having a central portion lifted above the peripheral portion and having a plurality of bottom concave ribs extending inward and radially extending to the peripheral portion. is there.

  The present invention relates to a non-heat-resistant molded plastic bottle, comprising a mouth portion, a trunk portion, and a bottom portion, the trunk portion having a substantially polygonal cylinder shape having a plurality of side surfaces, and between the adjacent side surfaces of the trunk portion. Each of the boundary surfaces is formed, and each of the boundary surfaces is provided with a plurality of trunk concave ribs that are drawn inward and extend in the axial direction of the trunk, and among these, the pair of trunk concave ribs is a side surface adjacent to the boundary surface. The bottom part has a peripheral part and a central part located at the center of the peripheral part and lifted upward from the peripheral part. The bottom part is drawn inwardly and extends radially. A non-heat-resistant molded plastic bottle provided with a plurality of bottom concave ribs.

  The present invention is a non-heat-resistant molded plastic bottle in which a flat panel portion is formed on each side surface of the body portion.

  The present invention is a non-heat-resistant molded plastic bottle characterized in that another barrel-shaped concave rib is further provided at the center of each boundary surface.

  In the present invention, each side surface of the body portion is divided into an upper region and a lower region via side horizontal concave ribs that are drawn inward, and each boundary surface of the body portion is interposed via a boundary surface horizontal concave rib that is drawn inwardly. A non-heat-resistant molded plastic bottle characterized in that it is divided into an upper region and a lower region, and a plurality of body-shaped concave ribs are provided in the upper region and the lower region of each boundary surface.

  The present invention is the non-heat-resistant molded plastic bottle, wherein the bottom concave rib is provided in a portion corresponding to both side portions of each side surface in the peripheral portion of the bottom portion.

  According to the present invention, each of the boundary surfaces formed between the side surfaces of the body portion is provided with a plurality of body-shaped convex ribs that are drawn inward and extend in the axial direction of the body portion, and of these, a pair of body portion concave shapes Since the ribs are provided on a pair of ridge lines between the boundary surface and the adjacent side surfaces, the strength of the ridge line of the boundary surface where pressure from the content liquid is easily applied when the bottle is heated can be increased.

  In addition, since a plurality of bottom concave ribs that are drawn inwardly and extend radially to the peripheral portion of the bottom portion are provided, the peripheral portion of the bottom portion is not bent when the central portion of the bottom portion is pushed up to fill the content liquid under reduced pressure. .

FIG. 1A is a front view showing a non-heat-resistant molded plastic bottle according to an embodiment of the present invention, and FIG. 1B is a front view seen from an angle different from FIG. 1A showing a non-heat-resistant plastic bottle. . FIG. 2 is a perspective view showing a non-heat-resistant molded plastic bottle according to an embodiment of the present invention. FIG. 3 is a bottom view showing a non-heat-resistant molded plastic bottle according to one embodiment of the present invention. FIG. 4 is a top view showing a non-heat-resistant molded plastic bottle according to one embodiment of the present invention. FIG. 5A is a front view showing the operation of the non-heat-resistant molded plastic bottle according to one embodiment of the present invention, and FIG. 5B is a view from a different angle to FIG. 5A showing the non-heat-resistant molded plastic bottle. Front view. FIG. 6 is a bottom view showing the operation of the non-heat-resistant molded plastic bottle according to one embodiment of the present invention. FIG. 7 is a view showing a deformed state of the plastic bottle when the plastic bottle is heated. FIG. 8 is a diagram showing a stress waveform of a non-heat-resistant molded plastic bottle according to one embodiment of the present invention. FIGS. 9A and 9B are views showing a trunk concave rib and a bottom concave rib. FIGS. 10A and 10B 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 9 show an embodiment of the present invention.

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

  A heating plastic bottle 10 shown in FIGS. 1 to 9 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. 10A).

  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 in which the mouth portion 11 is crystallized, and heat resistance is required to sterilize the mouth portion 11 with a high-temperature content liquid (see FIG. 10B).

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 substantially polygonal cylinder shape, for example, square tube shape as a whole. Further, a flat boundary surface 22 is formed between the adjacent side surfaces 21.

  Moreover, the four side surfaces 21 of the trunk | drum 20 are divided into the upper area | region 21a and the lower area | region 21b through the side surface horizontal concave rib 24a drawn inward (inward of the bottle 10). Each boundary surface 22 is also divided into an upper region 22a and a lower region 22b via a boundary surface horizontal concave rib 24b that is drawn inward (inward of the bottle 10).

  Among these, the horizontal concave rib 24 is comprised by the side surface horizontal concave rib 24a and the boundary surface horizontal concave rib 24b.

  Further, a flat panel portion 23 is provided in each of the upper region 21a and the lower region 21b of each side surface 21 of the trunk portion 20, and the panel portion 23 allows the plastic bottle 10 to be inflated and decompressed. Absorbs the applied pressure.

  Further, the upper region 22a and the lower region 22b of each boundary surface 22 of the body portion 20 are drawn inwardly (inward of the bottle 10), and at the same time, the axial direction L direction of the body portion 20 (FIGS. 1A and 1B). A plurality of, for example, three trunk-shaped concave ribs 25a, 25b, and 25c are provided.

  As described above, a total of four side surfaces 21 and boundary surfaces 22 of the body portion 20 are provided, and three upper body concave ribs 25a and 25b are provided in the upper region 22a and the lower region 22b of one boundary surface 22, respectively. 25c is provided. For this reason, a total of 24 barrel-shaped concave ribs 25a, 25b, and 25c are provided as the plastic bottle 10 as a whole.

  By the way, out of the three barrel concave ribs 25a, 25b, 25c provided in the upper region 22a of each boundary surface 22 of the trunk portion 20, the pair of trunk concave ribs 25a, 25b is an upper region 22a of the boundary surface 22. Are provided on a pair of ridge lines between the upper region 21a of the adjacent side surfaces 21 (on both side edges of the upper region 22a of the boundary surface 22). In addition, the remaining one body part concave rib (other body part concave rib) 25c is provided between the pair of body part concave ribs 25a and 25b and at the center of the upper region 22a.

  Similarly, of the three body concave ribs 25a, 25b, 25c provided in the lower region 22b of each boundary surface 22, the pair of body concave ribs 25a, 25b are adjacent to each other in the lower region 22b of the boundary surface 22. It is provided on a pair of ridge lines between the lower region 21 b of the side surface 21 (on both side edges of the lower region 22 b of the boundary surface 22). In addition, the remaining one body part concave rib (other body part concave rib) 25c is provided between the pair of body part concave ribs 25a and 25b and at the center of the lower region 22b.

  Furthermore, the bottom part 30 has a peripheral part 31 and a central part 32 located at the center of the peripheral part 31 and lifted upward from the peripheral part 31, and a plurality of, for example, eight pieces extending radially to the peripheral part 31. A bottom concave rib 33 is provided. Each of the eight bottom concave ribs 33 is formed by being drawn inward (inward of the bottle 10), and maintains the strength of the peripheral edge 31 of the bottom 30.

  By the way, the bottom concave ribs 33 provided in the peripheral portion 31 are provided in portions corresponding to both side portions of the four side surfaces 21 of the trunk portion 20.

  That is, the trunk portion 20 has four side surfaces 21 and the bottom concave ribs 33 are provided corresponding to both side portions of each side surface 21, so that a total of eight bottom concave ribs 33 are formed as described above. Yes.

  By the way, each trunk | drum concave rib 25a, 25b, 25c and the bottom concave rib 33 have the same shape, for example, has a cross-sectional curved shape as shown to Fig.9 (a). Alternatively, the body concave ribs 25a, 25b, 25c and the bottom concave rib 33 may be formed in a triangular cross section as shown in FIG. 9B, or formed in a trapezoidal cross section as shown in FIG. 9C. May be. Further, the body concave ribs 25a, 25b, 25c and the bottom concave rib 33 may be formed in a polygonal cross section.

  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, 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.

  In this case, the content liquid is filled into the plastic bottle 10 in a state where the central portion 32 of the bottom 30 of the plastic bottle 10 is pushed up by a push rod (not shown).

  When the central portion 32 of the bottom portion 30 is pushed up by the push rod, the peripheral portion 31 of the bottom portion 30 may be bent in the region B shown in FIGS. 5A and 5B and FIG. 31 is provided with bottom concave ribs 33 which are drawn inward at portions corresponding to both side portions of each side surface 21 where a large force is considered to be applied, so that the strength of the peripheral edge portion 31 is increased by the bottom concave ribs 33. You can plan. For this reason, the center part 32 of the bottom part 30 can be largely pushed up with a push rod, and by this, the content liquid is filled in the plastic bottle 10 and then sealed, so that the content liquid is put into the plastic bottle 10 in a reduced pressure state. Can be filled.

  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, as shown in FIG. 7, each side surface 21 of the body portion 20 swells 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. It curves inward (also referred to as the inner side) (see the two-dot chain line in FIG. 7).

  At this time, since the trunk-shaped concave ribs 25a, 25b, and 25c are provided in the upper region 22a and the lower region 22b of each boundary surface 22, the strength of each boundary surface 22 can be improved. In particular, since the pair of body-shaped concave ribs 25a and 25b are provided on the ridge line with the side surface 21 in the upper region 22a and the lower region 22b of each boundary surface 22 to which the force from the content liquid is applied, The strength of the upper region 22a and the lower region 22b can be further improved. Therefore, the region A (see FIGS. 5A, 5B, and 6) where the boundary surfaces 22 are formed in the body portion 20 is not greatly curved inward, and the side surfaces 21 are large. It does not swell outward. As a result, the appearance of the plastic bottle 10 during heating can be maintained satisfactorily.

  Moreover, according to this Embodiment, since the plastic bottle 10 can be comprised from a non-heat-resistant shaping | molding bottle, an aseptic filling system can be employ | adopted as a filling system of a content liquid. For this reason, it becomes possible to aim at reduction of production cost, without impairing the flavor of the content liquid of a bottle.

  In the above embodiment, an example in which the body concave ribs 25a, 25b, and 25c are provided on the boundary surface 22 of the body 20 and the bottom concave rib 33 is provided on the peripheral edge 31 of the bottom 30 is shown. However, the bottom concave ribs 33 may be provided only on the peripheral edge 31 of the bottom 30 without providing the body concave ribs 25 a, 25 b, 25 c on the boundary surface 22. Alternatively, the body concave ribs 25 a, 25 b, and 25 c may be provided only on the boundary surface 22 without providing the bottom concave rib 33 on the peripheral edge 31 of the bottom 30.

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

  First, the following four types of plastic bottles (Example 1-3, Comparative Example 1) were produced.

Example 1
A 345 ml plastic bottle 10 having the structure shown in FIGS. 1 to 6 was produced.

  In this case, a 22.7 g PET single layer preform was first produced by injection molding, and a 345 ml square cylindrical plastic bottle 10 was produced by biaxial stretch blow molding.

  After filling the plastic bottle 10 with the content liquid at 25 ° C. and 70 ° C., the central portion 32 of the bottom 30 was pushed up by 7 mm to seal the plastic bottle 10 tightly. In addition, at 70 degreeC, it cooled to normal temperature after that.

  Thereafter, a hot water bath at 75 ° C. × 60 min was applied to the plastic bottle 10, and the amount of dimensional change of the plastic bottle 10 was measured before and after the hot water bath to evaluate heat-resistant scratches.

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

(Example 2)
A 345 ml plastic bottle 10 having the same configuration as that of Example 1 was produced except that only the bottom concave rib 33 was provided without providing the trunk concave ribs 25a, 25b, and 25c.

  In this case, a 22.7 g PET single layer preform was first produced by injection molding, and a 345 ml square cylindrical plastic bottle 10 was produced by biaxial stretch blow molding.

  After filling the plastic bottle 10 with the content liquid at 25 ° C. and 70 ° C., the central portion 32 of the bottom 30 was pushed up by 7 mm to seal the plastic bottle 10 tightly. In addition, when filling the content liquid at 70 degreeC, it cooled to normal temperature after that.

  Thereafter, a hot water bath at 75 ° C. × 60 min was applied to the plastic bottle 10, and the amount of dimensional change of the plastic bottle 10 was measured before and after the hot water bath to evaluate heat-resistant scratches.

  The plastic bottle 10 of Example 2 was set to shape B.

(Example 3)
A 345 ml plastic bottle 10 having the same configuration as that of Example 1 was prepared except that the body concave ribs 25a, 25b, and 25c were provided and the bottom concave rib 33 was not provided.

  In this case, a 22.7 g PET single layer preform was first produced by injection molding, and a 345 ml square cylindrical plastic bottle 10 was produced by biaxial stretch blow molding.

  After filling the plastic bottle 10 with the content liquid at 25 ° C. and 70 ° C., the central portion 32 of the bottom 30 was pushed up by 3 mm to seal the plastic bottle 10 tightly. In addition, when filling the content liquid at 70 degreeC, it cooled to normal temperature after that.

  Thereafter, a hot water bath at 75 ° C. × 60 min was applied to the plastic bottle 10, and the amount of dimensional change of the plastic bottle 10 was measured before and after the hot water bath to evaluate heat-resistant scratches.

  The plastic bottle 10 of Example 3 was shaped C.

(Comparative Example 1)
A 345 ml plastic bottle 10 was produced in the same manner as in the example except that the body concave ribs 25a, 25b and 25c were not provided and the bottom concave rib 33 was not provided.

  In this case, a 22.7 g PET single layer preform was first produced by injection molding, and a 345 ml square cylindrical plastic bottle 10 was produced by biaxial stretch blow molding.

  After filling the plastic bottle 10 with the content liquid at 25 ° C. and 70 ° C., the central portion 32 of the bottom 30 was pushed up by 3 mm to seal the plastic bottle 10 tightly. In addition, when filling the content liquid at 70 degreeC, it cooled to normal temperature after that.

  Thereafter, a hot water bath at 75 ° C. × 60 min was applied to the plastic bottle 10, and the amount of dimensional change of the plastic bottle 10 was measured before and after the hot water bath to evaluate heat-resistant scratches.

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

(Evaluation of flexibility of the peripheral edge 31 of the bottom 30)
With respect to the plastic bottle 10 (shape A) of Example 1 and the plastic bottle 10 (shape D) of Comparative Example 1, the central portion 32 of the bottom portion 30 is pushed up with a push rod, and the flexibility of the peripheral edge portion 31 in this case is increased. evaluated.

  The evaluation results are shown in FIG. In FIG. 8, the horizontal axis shows the displacement (mm) of the central portion 32 by the push rod, and the vertical axis shows the pressure (N) by the push rod.

  As shown in FIG. 8, for the shape A, even if the central portion 32 is displaced until the displacement becomes 10 (mm), the bending point does not appear in the peripheral portion 31. That is, in the case of the shape A, since the plurality of bottom concave ribs 33 are provided on the peripheral edge 31 of the bottom 30, the strength of the peripheral edge 31 can be increased.

  On the other hand, with respect to the shape D, the bottom concave rib 33 is not provided on the peripheral edge 31 of the bottom 30, and therefore, when the central portion 32 of the bottom 30 is pushed up with a push rod, a plurality of bending points P appear, It shows that plastic deformation has occurred in the portion 31.

  Specifically, in FIG. 8, in the shape D, when the central portion 32 is displaced by 3.4 mm, the first bending point P appears.

  Therefore, for the shape D, it is necessary to push up the central portion 32 within the range of the first bending point P or less.

(Evaluation of heat resistance)
Next, in order to evaluate the heat resistance of the shapes A to D, when the filling temperature was set to 25 ° C. and 70 ° C., samples of n = 5 were respectively prepared, and the plastic bottle was boiled (75 ° C. × 60 min). The amount of dimensional deformation was measured. Here, as the dimensional change amount, the sum of the square of the dimensional change amount between the two opposing side surfaces 21 and the square of the dimensional change amount between the two opposing boundary surfaces 22 was obtained and used as the shape maintenance index.

Further, the push-up amount of the central portion 32 of the bottom 30 at the time of filling the content liquid was 7 mm for the shape AB and 3 mm for the shape CD. This shape maintenance index is shown in Table 1.

  As can be seen from Table 1, heat resistance evaluation that can withstand use was obtained for the shapes AC. Regarding shape D, when the content liquid was filled at 70 ° C., there was no large dimensional deformation, but when the content was filled at 25 ° C., large dimensional deformation appeared, and a heat resistance evaluation that could withstand use was not obtained. .

  In Table 1, when the plastic bottle 10 is filled with the content liquid at 70 ° C., the plastic bottle 10 is once cooled and contracted to room temperature, and then expanded by reheating to 75 ° C. and heating. I will let you. On the other hand, when the content liquid is filled in the plastic bottle 10 at 25 ° C., it is simply inflated by boiling water up to 75 ° C. and heating. For this reason, in any of the shapes A to D, the dimensional change amount is larger when the content liquid is filled at 25 ° C. than when the content is filled at 70 ° C.

DESCRIPTION OF SYMBOLS 10 Plastic bottle 11 Mouth part 12 Shoulder part 20 Body part 21 Side surface 21a Upper area | region 21b Lower area 22 Boundary surface 23 Panel part 24 Horizontal concave rib 24a Side horizontal concave rib 24b Boundary horizontal concave rib 25a, 25b, 25c 30 Bottom part 31 Peripheral part 32 Center part 33 Bottom concave rib

Claims (7)

In non-heat-resistant molded plastic bottles,
The mouth,
The torso,
With a bottom,
The trunk portion has a substantially polygonal cylinder shape having a plurality of side surfaces,
Boundary surfaces are formed between adjacent side surfaces of the body part, and a plurality of body-shaped concave ribs that are drawn inward and extend in the axial direction of the body part are provided on each boundary surface. The non-heat-resistant molded plastic bottle, wherein the rib is positioned on a pair of ridge lines between the boundary surface and the adjacent side surface. In non-heat-resistant molded plastic bottles,
The mouth,
The torso,
With a bottom,
The trunk portion has a substantially polygonal cylinder shape having a plurality of side surfaces,
The bottom part has a peripheral part and a central part located at the center of the peripheral part and lifted above the peripheral part, and is provided with a plurality of bottom concave ribs that are drawn inward and extend radially to the peripheral part. Non-heat resistant molded plastic bottle. In non-heat-resistant molded plastic bottles,
The mouth,
The torso,
With a bottom,
The trunk portion has a substantially polygonal cylinder shape having a plurality of side surfaces,
Boundary surfaces are formed between adjacent side surfaces of the body part, and a plurality of body-shaped concave ribs that are drawn inward and extend in the axial direction of the body part are provided on each boundary surface. The rib is located on a pair of ridge lines between the boundary surface and the adjacent side surface,
The bottom part has a peripheral part and a central part that is located at the center of the peripheral part and lifted upward from the peripheral part, and is provided with a plurality of bottom concave ribs that are drawn inward and extend radially to the peripheral part. Non-heat resistant molded plastic bottle.   The non-heat-resistant molded plastic bottle according to any one of claims 1 to 3, wherein a flat panel portion is formed on each side surface of the body portion.   5. The non-heat-resistant molded plastic bottle according to claim 1, further comprising another body-shaped concave rib at the center of each boundary surface. Each side surface of the body portion is partitioned into an upper region and a lower region through side horizontal concave ribs that are drawn inwardly.
Each boundary surface of the trunk is divided into an upper region and a lower region via a boundary horizontal concave rib that is drawn inward,
6. The non-heat-resistant molded plastic bottle according to claim 1, wherein a plurality of body-shaped concave ribs are provided in an upper region and a lower region of each boundary surface.   4. The non-heat-resistant molded plastic bottle according to claim 2, wherein the bottom concave rib is provided in a portion corresponding to both side portions of each side surface of the peripheral portion of the bottom portion. 5.

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