JP2019177882A - Plastic bottle - Google Patents

Abstract

To provide a heated plastic bottle which inhibits limitations on a bottle attachment surface of a roll label to have excellent aesthetics of the bottle and maintains a good bottle appearance during heating and cooling after the heating in a case where a pressure absorption panel is not provided at a body part of the bottle.SOLUTION: A heated plastic bottle 100 of the invention includes a mouth part 1, a body part 3, and a bottom part 4. The body part 3 is formed into a cylindrical shape having a cylindrical surface. The body part 3 includes a bellows shaped flexible elastic part 10 which extends and contracts in an axial direction. The bellows shaped flexible elastic part 10 is formed by arranging a number of recessed parts 11 continuously in a circumferential direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a plastic bottle. More specifically, the present invention relates to a plastic bottle for beverages that is heated in a hot warmer or a vending machine.

In recent years, plastic bottles have been used for heated beverages.
When such a plastic bottle is heated, the internal pressure of the bottle increases. At this time, it is required to prevent a significant difference between the bottle shapes before and after heating. Furthermore, when it cools after heating, the internal pressure of a bottle reduces. Even in this case, it is required to prevent a significant difference between the bottle shapes before and after cooling.
For example, Patent Document 1 discloses a plastic bottle for heating in which a panel portion having a concave pressure absorbing function is formed on a cylindrical surface of a body portion.

JP 2011-31899 A

When a concave pressure absorbing panel is provided in the body portion of the plastic bottle, there is a problem that the volume of the body portion of the bottle is reduced and the bottle design is restricted.
Moreover, in a plastic bottle, a shrink label and a roll label may be attached as surface decoration. In the case of a roll label, one end of the belt-like label is glued and fixed to a predetermined position on the body of the bottle, and the label is wound around the bottle and the label both ends are bonded and fixed to each other. The
When a pressure absorption panel is provided on the part of the bottle body where the roll label is mounted, the label is bonded to the bottle because of the uneven structure of the columnar part located between the pressure absorption panel and the pressure absorption panel wall. There is a problem that the fixing position is limited to the columnar portion.
In addition, when a pressure absorbing panel is provided in a portion where a shrink label or a roll label is attached, the display portion of the label appears to be distorted due to the uneven structure, and there is a problem that the aesthetics of the bottle are impaired. .
Moreover, since a plastic bottle can confirm an internal state with a transparent body, a label etc. which can be seen through may be attached. However, when the pressure absorbing panel is provided in the body portion, the inside appears to be distorted, which causes a problem that the aesthetics of the bottle are impaired.

  The present invention has been made in such a situation, and the object thereof is a case where there is no pressure absorbing panel in the body of the bottle, the bottle mounting surface of the roll label is not limited, and the aesthetics of the bottle are improved. An object of the present invention is to provide a plastic bottle that is excellent and maintains a good bottle appearance both during heating and during cooling after heating.

  The plastic bottle of the present invention for solving the above problems includes a mouth portion, a body portion, and a bottom portion, and the body portion has a cylindrical shape having a cylindrical surface, and the body portion has a shaft. A bellows-like flexible elastic portion that expands and contracts in the direction is provided, and the bellows-like flexible elastic portion has a plurality of concave portions arranged continuously in the circumferential direction.

In the plastic bottle of the present invention, a plurality of rows of the bellows-like flexible elastic portions that are continuous in the vertical direction of the body portion may be arranged with a phase shifted in the circumferential direction.
The plastic bottle of the present invention may be a heating plastic bottle.

  According to the plastic bottle of the present invention, there is no pressure absorption panel in the body of the bottle, the bottle mounting surface of the roll label is not limited, and the bottle has excellent aesthetics, and during and after heating It is possible to provide a plastic bottle that maintains a good bottle appearance at any time of cooling.

It is a front view which shows an example of embodiment of the plastic bottle concerning this invention. FIG. 2 is a plan end view taken along line XX in FIG. 1. It is a vertical front view which follows the YY line in FIG. It is a front view which shows an example of embodiment of the plastic bottle concerning the comparative example 1. FIG. It is a front view which shows an example of embodiment of the plastic bottle concerning the comparative example 2.

  Hereinafter, an example of an embodiment of a plastic bottle of the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments, and various modifications can be made within the scope of the gist thereof.

  First, the outline of the plastic bottle according to the present embodiment will be described with reference to FIGS. In the present specification, “upward”, “downward”, “vertical direction”, and “circumferential direction” respectively indicate the upward, downward, vertical, and horizontal directions when the plastic bottle 100 is in an upright state (FIG. 1). It refers to the direction.

A plastic bottle 100 shown in FIG. 1 to FIG. 3 is provided at the mouth 1, the shoulder 2 provided below the mouth 1, the body 3 provided below the shoulder 2, and the body 3 below. The bottom part 4 is provided.
A label 20 is provided outside the plastic bottle. In FIG. 1, the label 20 is indicated by a broken line.

  Among these, the trunk | drum 3 has a cylindrical surface, and consists of a substantially cylindrical shape as a whole. Here, the trunk diameter indicates the outer diameter. The thickness of the trunk is preferably 0.1 mm or more and 0.5 mm or less.

The cylindrical surface of the body part 3 is provided with a bellows-like flexible elastic part 10 that expands and contracts in the axial direction. The bellows-like flexible elastic portion 10 becomes a concave portion 11 toward the inside of the container, and is formed by continuously forming eight concave portions 11 in the circumferential direction.
Then, five rows of bellows-like flexible elastic portions 10 are formed in the up-down direction of the body portion 3 so as to be out of phase in the circumferential direction.
In addition, a pasting region 21 to which an adhesive material for pasting the label 20 is attached is formed on the body 3. In this Embodiment, the sticking area | region 21 is formed in the area | region where the bellows-like flexible elastic part 10 is not formed, ie, a cylindrical surface.

In addition, the number of the recessed parts 11 which comprise the bellows-like flexible elastic part 10 is not restricted to eight pieces, Four to 16 pieces can be formed.
Further, the number of bellows-like flexible elastic portions 10 is not limited to five rows, but may be one or more rows. However, since the cylindrical surface of the trunk | drum 3 will become narrow and the sticking area | region 21 will also become narrow if there are many rows | lines, the number of rows which becomes 1/3 or less of the length of the height direction of the cylindrical surface 14 is desirable.
Moreover, in this Embodiment, all the recessed parts 11 have the same shape and dimension. However, it is not restricted to this, The shape or dimension of all the recessed parts 11 of the circumferential direction does not necessarily need to be the same.

Each of these concave portions 11 extends over the entire area in the circumferential direction. These concave portions 11 are elastically deformed when heated, and the body portion is in a state of extending in the vertical direction, thereby exhibiting a pressure absorption function.
On the other hand, these concave portions 11 are elastically deformed during cooling after heating, and the trunk portion is bent in the vertical direction, thereby exhibiting a reduced pressure absorption function.

   In the present embodiment shown in FIGS. 1 to 3, the total volume of the bellows-like flexible elastic portion 10 is 2 ml or more. The total volume of the flexible elastic portion is “total volume of the flexible elastic portion” = “full capacity of the bottle without the flexible elastic portion” − “full capacity of the bottle having the flexible elastic portion”. It is calculated based on the formula. Specifically, the plastic bottle 60 shown in FIG. 5 corresponds to a bottle having no flexible elastic portion, and the plastic bottle 100 shown in FIG. 1 corresponds to a bottle having a flexible elastic portion. If the total volume of the bellows-like flexible elastic part 10 is less than 2 ml, the volume of each concave part 11 is too small, and the pressure absorption function of the plastic bottle 100 becomes insufficient. There is a possibility that the bottom part 4 will be deformed greatly without being able to absorb enough and the bottle 100 will not stand upright, and when cooled after warming, the inside of the bottle will be decompressed and the body part 3 will collapse locally. There is a risk of it.

  Moreover, the depth d1 (refer FIG. 2) of each concave-shaped part 11 is 1.0 mm-8.0 mm. When the depth d1 of each concave portion 11 is less than 1.0 mm, it is difficult to obtain the effect of flexible elasticity, and the effect of the pressurization and reduced pressure absorption function is exerted both during heating and during cooling after heating. It is difficult to obtain. On the other hand, when the depth d1 of each concave-shaped part 11 exceeds 8.0 mm, the boundary ridgeline 12 will be whitened due to poor shaping or overstretching during blow molding. In addition, the depth d1 of each concave-shaped part 11 means the maximum distance from the cylindrical surface 14 to the bottom face 13 of each concave-shaped part 11 (refer FIG. 2).

  Moreover, in FIG. 1, it is preferable that the height h1 of each concave part 11 shall be 3 mm-10 mm, and the width w1 of each concave part 11 shall be 20 mm-45 mm. When the height h1 is less than 3 mm and the width w1 is less than 20 mm, the concave portion 11 becomes small. Therefore, the action and effect of the pressurization and decompression absorption functions can be obtained both during heating and during cooling after heating. It is difficult to obtain.

  The size of the plastic bottle 100 is not limited, and may be any size bottle. For example, the volume of the plastic bottle 100 may be 200 ml to 600 ml. In particular, when the total height h2 (see FIG. 1) of the container is 120 mm to 210 mm and the trunk diameter w3 (see FIG. 1) of the container is 52 mm to 75 mm, the effect of the present embodiment can be suitably obtained. .

  In FIG. 3, the angles θ1 and θ2 of the inclined surface 15 are preferably 5 ° ≦ θ1 and θ2 ≦ 80 °, and the bellows-like flexible elastic portion is preferably expanded and contracted smoothly by pressurization and decompression. . In consideration of blow moldability and mold release after molding, it is more preferable that 10 ° ≦ θ1 and θ2 ≦ 80 °. Note that θ1 and θ2 may be the same value or different values.

  In the present embodiment, as described above, the total volume of the bellows-like flexible elastic portion 10 is 2 ml or more, and the depth d1 of each concave portion 11 is 1.0 mm to 8.0 mm. Thereby, even when the plastic bottle 100 is particularly thin, the appearance of the bottle can be maintained well both during heating and during cooling after heating. Specifically, the average thickness of the plastic bottle 100 can be reduced to 0.20 mm to 0.54 mm. The average thickness of the plastic bottle 100 is “average thickness” = “weight of the plastic bottle 100 (excluding the mouth portion 1)” / {“surface area of the plastic bottle 100 (excluding the mouth portion 1)” × “ The specific gravity of the plastic material (1.335 in the case of PET) "} can be calculated.

  Such a plastic bottle 100 can be produced by biaxially stretch blow molding a preform produced by injection molding a synthetic resin material. Note that it is preferable to use a thermoplastic resin, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), or PEN (polyethylene naphthalate) as the material of the preform, that is, the plastic bottle 100.

  The plastic bottle 100 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 3 of the plastic bottle 100. Moreover, it is preferable to provide an intermediate layer in the bottom portion 4 in a region excluding the central portion of the bottom portion 4. 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 label 20 will be described.
The label 20 displays contents and the like and is attached to the outer surface of the plastic bottle 100. For example, the label 20 may be manufactured by forming a sheet-like film into a cylindrical shape and bonding the end portions thereof. The label 20 is bonded to the plastic bottle 100 with an adhesive material attached to the pasting area 21. The label 20 is provided over the entire week direction so as to surround the plastic bottle, and has a substantially circular horizontal cross section.

  In this case, the label 20 is provided so as to cover the body portion 3 of the plastic bottle 100, but may be provided in the entire region or a partial region other than the mouth portion 1. For example, the label 20 may be provided so as to cover the shoulder 2, the body 3, and the bottom 4. Or the label 20 may be provided so that the shoulder part 2 and the trunk | drum 3 may be covered. Further, the number of labels 20 is not limited to one, and a plurality of labels 20 may be provided.

Examples of the label 20 include a roll label, a tack label, and a paper label. Among these, it is preferable from the point of productivity to use a roll label.
As the label 20, for example, a shrink label or a stretch label that does not use an adhesive material may be used.

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

  First, the plastic bottle 100 is filled with a content liquid such as green tea or coffee, and then sealed. Further, a shrink label or a roll label is attached around the body 3. Thereafter, the plastic bottle 100 is sold in a heated state in a hot warmer or a vending machine.

  At this time, when the plastic bottle 100 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 100 increases. Further, as the bottle internal pressure of the plastic bottle 100 increases, the bellows-like flexible elastic portion 10 is elastically deformed.

In this case, each concave-shaped part 11 of the trunk | drum 3 will be elastically deformed at the time of a heating, and the bellows-like flexible elastic part 10 of a trunk | drum will be in the state extended in the up-down direction. In the present embodiment, 8 rows are 5 rows, the total volume of 40 concave portions 11 is 2 ml or more, and the depth of each concave portion 11 is 1.0 mm to 8.0 mm. Since the volume of each concave portion 11 is increased in this way, each concave portion 11 does not protrude outward from the cylindrical surface 14 even when the bottle internal pressure increases and each concave portion 11 is elastically deformed. The label position is almost unchanged. Thereby, the bottle external appearance at the time of heating can be maintained favorable.
Moreover, the buckling strength can be increased by arranging a plurality of rows of bellows-like flexible elastic portions 10 that are continuous in the vertical direction of the body portion with a phase shifted in the circumferential direction.

  On the other hand, it is conceivable that the heated plastic bottle 100 for heating is left as it is at room temperature without being opened, 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 of the heating plastic bottle 100 is reduced.

  In this case, when heated, the bellows-like flexible elastic portion 10 extending in the vertical direction is elastically deformed, and the bellows-like flexible elastic portion 10 of the trunk portion 3 contracts in the vertical direction. Thus, in the present embodiment, when the internal pressure of the bottle decreases and each concave portion 11 is elastically deformed and contracts in the vertical direction of the bellows-like flexible elastic portion 10, each concave portion 11 is reduced in pressure. Is absorbed evenly, so that the body 3 does not sink locally. In addition, since the bellows-like flexible elastic portion 10 is disposed inside the label, the contracted bellows-like flexible elastic portion 10 is inconspicuous in appearance. Even if the bottle internal pressure is reduced by arranging a plurality of rows of bellows-like flexible elastic portions 10 that are continuous in the vertical direction of the body portion in the circumferential direction, the load in the axial direction of the container is reduced. On the other hand, elastic deformation in the vertical direction is facilitated. Therefore, even if the plastic bottle 100 for heating is a case where it cools after heating, a bottle external appearance can be maintained favorable.

  By the way, in such a plastic bottle 100, after the plastic bottle 100 is filled with the contents, a label for displaying the contents and the like is attached and then sold as a product. In this case, the label 20 is bonded to the plastic bottle 100 with an adhesive material attached to the pasting region 21. Here, in the plastic bottle 100, the pasting region 21 is formed in a region where the bellows-like flexible elastic portion 10 is not formed, that is, in a cylindrical surface. Thereby, when affixing the label 20 to the plastic bottle 100, the trouble that it becomes difficult for the adhesive material to enter the bellows-like flexible elastic part 10 and affix the label can be prevented.

  As described above, according to the present embodiment, the total volume of the 40 concave portions 11 is set to 2 ml or more, and the depth d1 of each concave portion 11 is set to 1.0 mm to 8.0 mm. Since the configuration is possible, the appearance of the bottle 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 0.54 mm), the bottle appearance can be maintained well.

  In the present embodiment, the label 20 is bonded to the plastic bottle 100 with an adhesive attached to the pasting region 21. Here, in the plastic bottle 100, the pasting region 21 is formed in a region where the bellows-like flexible elastic portion 10 is not formed, that is, in a cylindrical surface. Thereby, the malfunction which becomes difficult to affix the label 20 can be prevented. For this reason, a highly productive roll label can be easily attached as the label 20.

  Moreover, according to this Embodiment, the plastic bottle 100 can be comprised from either a heat resistant bottle and a non-heat resistant bottle. That is, since the aseptic filling method can be adopted as the filling method of the content liquid, it is possible to reduce the production cost without impairing the flavor of the content liquid in the bottle.

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

  First, the following three types of plastic bottles (Example 1, Comparative Example 1, and Comparative Example 2) were prepared. This was a plastic bottle produced from a PET resin preform by a biaxial stretch blow function, and its weight was 22 g.

Example 1
A 300 ml plastic bottle 100 (Example 1) having the structure shown in FIGS. 1 to 3 was produced. In this case, the bellows-like flexible elastic portion 10 was formed by forming eight concave portions 11 in the circumferential direction of the bottle, and having five rows in the vertical direction and equally spaced in the circumferential direction. The structural unit surface of each concave portion 11 was shaped to be recessed to a depth of 2.0 mm at the deepest point from the cylindrical surface 14 along the axial center line of the bottle. Moreover, the boundary ridgeline 12 of each concave-shaped part 11 was 3.8 mm.

  In this plastic bottle 100 (Example 1), the total height of the bellows-like flexible elastic portion 10 is 15 mm, the height h1 of each concave portion 11 is 5 mm, the width w1 of each concave portion 11 is 22 mm, and the total height of the container h2 was 132 mm, body diameter w3 was 66 mm, full capacity 311 ml, angle θ1 was 50 °, and θ2 was 50 °.

(Comparative Example 1)
Next, a plastic bottle 50 (Comparative Example 1) for 280 ml having the configuration shown in FIG. 4 was produced. As shown in FIG. 4, 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. Further, six panel portions 56 are formed on the cylindrical surface of the body portion 53. In this case, the total volume of the six panel portions 56 was 16 ml, and the depth of the deepest portion of each panel portion 56 was 2.2 mm. The total volume of the panel part is calculated based on the formula “total volume of the panel part” = “full capacity of the bottle without the panel part” − “full capacity of the bottle with the panel part”. is there. Specifically, the plastic bottle 60 shown in FIG. 5 corresponds to a bottle having no panel portion, and the plastic bottle 50 shown in FIG. 4 corresponds to a bottle having a panel portion.

  Moreover, in this plastic bottle 50 (Comparative Example 1), the height h3 of each panel part 56 is 50 mm, the width w4 of each panel part 56 is 25 mm, the total height h4 of the container is 132 mm, the trunk diameter w5 is 66 mm, and the full capacity 293 ml, and the width w6 of each columnar part 57 was 4.2 mm.

(Comparative Example 2)
Next, a 300 plastic bottle 60 (Comparative Example 2) having the configuration shown in FIG. 5 was produced. As shown in FIG. 5, the plastic bottle 60 (Comparative Example 2) has a mouth portion 61, a shoulder portion 62, a trunk portion 63, and a bottom portion 64. In addition, the panel part is not formed in the cylindrical surface of the trunk | drum 63. FIG. The total height h4 of the container was 132 mm, the trunk diameter w5 was 66 mm, and the full injection capacity was 314 ml.

  For each of the four plastic bottles (Example 1, Comparative Example 1, and Comparative Example 2), each was attached with a roll label, filled with water as a content solution, and then sealed. Thereafter, three types of plastic bottles (Example 1, Comparative Example 1, and Comparative Example 2) were each immersed in hot water at 75 ° C. for 1 hour from the bottom of the container to a position of 100 mm, and the states of the bottles after heating were compared. did.

  As a result, four of the four plastic bottles 100 of Example 1 maintained the standing posture, and the bottle appearance was maintained well. Moreover, the average of the total height increase amount was 6.6 mm. Furthermore, even after the bottle was cooled to room temperature, the bottle appearance was maintained well.

On the other hand, four of the four plastic bottles 50 in Comparative Example 1 maintained a standing posture and maintained a good bottle appearance. Moreover, the average of the total height increase amount was 4.3 mm. Furthermore, even after the bottle was cooled to room temperature, the bottle appearance was maintained well.
Thus, although the comparative example 1 has no problem in the heating performance, the bottle mounting surface of the roll label is limited to the columnar portion between the panels.

  Moreover, since the plastic bottle 60 of the comparative example 2 has an insufficient pressure absorption function, two of the four bottles do not hold the standing state, and the bottle appearance is damaged. In addition, the average of the total height increase of the two bottles that kept the standing state was 6.1 mm.

From this, the plastic bottle 100 (Example 1) according to the present embodiment has a greater change in overall height (elongation in the vertical direction) than the bottles of Comparative Example 1 and Comparative Example 2, and during and after heating. It was confirmed that the bottle appearance was maintained well at any time during cooling.
In addition, the plastic bottle 100 (Example 1) according to the present embodiment has a roll label bottle mounting surface that is not limited as compared with the bottle of Comparative Example 1, and can easily attach the label.

DESCRIPTION OF SYMBOLS 1,51,61 Mouth part 2,52,62 Shoulder part 3,53,63 trunk | drum 4,54,64 bottom part 10 bellows-like flexible elastic part 11 concave part 12 boundary ridgeline 13 bottom face 14 cylindrical surface 15 inclined surface 20 Label 21 Affixing area 56 Panel part 57 Columnar part 50, 60, 100 Plastic bottle

Claims (3)

In plastic bottles,
The mouth,
The torso,
And a bottom,
The trunk portion has a cylindrical shape having a cylindrical surface,
The body portion includes a bellows-like flexible elastic portion that expands and contracts in the axial direction,
The bellows-like flexible elastic part is a plastic bottle comprising a plurality of concave parts arranged continuously in the circumferential direction. 2. The plastic bottle according to claim 1, wherein a plurality of rows of the bellows-like flexible elastic portions that are continuous in the vertical direction of the body portion are arranged with a phase shifted in the circumferential direction. The plastic bottle according to claim 1 or 2, wherein the plastic bottle is for heating.

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