JP2017052559A - Plastic container for warming - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plastic container for warming, capable of being displayed in a bottle warmer even when filling content fluid of about 500 ml, and excellently retaining a container exterior appearance in both of warming and cooling after warming.SOLUTION: A plastic container 10 for warming, having a volume of 400 ml-550 ml includes a mouth 11, a shoulder 12 provided below the mouth 11, a trunk 20 provided below the shoulder 12, and a bottom 30 provided below the trunk 20. The trunk 20 has a nearly cylindrical shape having a cylindrical surface 21, the cylindrical surface 21 of the trunk 20 is provided with 5-7 sheets of pressure absorption panels 23 at a prescribed interval in the circumferential direction, and each of the absorption panels 23 has a shape recessed toward the inside. The total height of the plastic container 10 for warming is 160 mm-175 mm.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a warming plastic container, and more particularly to a warming plastic container heated in a bottle warmer.

  In recent years, plastic containers have become common as containers for beverages, and as such plastic containers, those used for warmed drinks (warming plastic containers) are also increasing. ing.

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

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

JP 2006-264721 A

  By the way, as conventional heating plastic containers, those having a capacity of 275 ml to 350 ml are generally used, but the capacity of the heating plastic container can be further increased, and for example, about 500 ml of the content liquid can be filled. It is requested to do. However, when the size of the container is simply increased, it becomes difficult to display on a general bottle warmer, or the above-described reduced pressure absorption function is impaired.

  The present invention has been made in consideration of such points, and even when about 500 ml of the content liquid is filled, it can be displayed on a bottle warmer, and during and after heating. An object of the present invention is to provide a warming plastic container capable of maintaining a good container appearance at any time of cooling.

  The present invention provides a heating plastic container having a capacity of 400 ml to 550 ml, a mouth portion, a shoulder portion provided below the mouth portion, a trunk portion provided below the shoulder portion, and the trunk A bottom portion provided below the portion, and the body portion has a substantially cylindrical shape having a cylindrical surface, and the cylindrical surface of the body portion has 5 to 7 sheets with a predetermined interval in the circumferential direction. A pressure absorption panel is provided, and each pressure absorption panel is a plastic container for heating characterized by having a concave shape toward the inside and having an overall height of 160 mm to 175 mm.

  The present invention is the plastic container for heating, wherein six pressure absorbing panels are provided.

  The present invention is the plastic container for heating, wherein each pressure absorption panel has a smooth bottom surface not provided with unevenness.

  The present invention is the heating plastic container, wherein the cylindrical body has a body diameter of 65 mm to 80 mm.

  The present invention is the plastic container for heating, wherein the mouth portion is not crystallized.

  According to the present invention, even when about 500 ml of the content liquid is filled, it can be displayed on a bottle warmer, and the container appearance is good both during heating and during cooling after heating. Can be maintained.

FIG. 1 is a front view showing a warming plastic container according to an embodiment of the present invention. FIG. 2 is a horizontal sectional view (a sectional view taken along the line II-II in FIG. 1) showing a plastic container for heating according to an embodiment of the present invention. FIG. 3 is a vertical sectional view (sectional view taken along line III-III in FIG. 1) showing a plastic container for heating according to an embodiment of the present invention. 4 is a front view showing a heating plastic container according to Comparative Example 1. FIG. 5 is a horizontal cross-sectional view (a cross-sectional view taken along the line VV in FIG. 4) showing a plastic container for heating according to Comparative Example 1. FIG. 6 is a vertical sectional view showing a heating plastic container according to Comparative Example 1 (cross-sectional view taken along the line VI-VI in FIG. 4). 7 is a front view showing a heating plastic container according to Comparative Example 2. FIG. 8 is a horizontal cross-sectional view (a cross-sectional view taken along line VIII-VIII in FIG. 7) showing a plastic container for heating according to Comparative Example 2. FIG. FIG. 9 is a vertical sectional view showing a heating plastic container according to Comparative Example 2 (cross-sectional view taken along the line IX-IX in FIG. 7).

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 3 are views showing an embodiment of the present invention.

  First, an outline of a heating plastic container according to the present embodiment will be described with reference to FIGS. In the present specification, “upward”, “downward”, “vertical direction”, and “horizontal direction” are respectively the upper, lower, It refers to the vertical and horizontal directions.

  A warming plastic container 10 shown in FIGS. 1 to 3 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 trunk portion 20. The bottom part 30 provided below is provided.

  Of these, the mouth portion 11 has a screw portion 14 screwed into a cap (not shown) and a flange portion 15 provided below the screw portion 14. The mouth portion 11 is not crystallized and is colorless and transparent. However, the present invention is not limited to this, and the mouth portion 11 may be crystallized (whitened).

  The shoulder portion 12 is located between the mouth portion 11 and the trunk portion 20 and has a shape whose diameter gradually increases from the mouth portion 11 side toward the trunk portion 20 side. A plurality of ribs 13 are formed radially on the shoulder 12.

  The trunk | drum 20 has the cylindrical surface 21, and consists of the substantially cylindrical shape with a substantially uniform diameter as a whole. Six pressure absorption panels 23 are provided on the cylindrical surface 21 of the body portion 20 at predetermined intervals (equal intervals) along the circumferential direction. Each pressure absorption panel 23 has a shape that becomes concave toward the inside of the body 20 as a whole. Columnar portions 22 are formed between adjacent pressure absorbing panels 23 in the cylindrical surface 21. In the present embodiment, six pressure absorbing panels 23 are provided, but the number is not limited to this, and may be five or seven.

  In the trunk portion 20, lateral ribs 27 extending in the circumferential direction are provided above and below the pressure absorbing panel 23, respectively, and the strength of the trunk portion 20 is reinforced by the lateral ribs 27.

  The bottom 30 has a depressed portion 31 located at the center and a grounding portion 32 provided around the depressed portion 31.

  In the present embodiment, each pressure absorbing panel 23 has a bottom surface 23a and a side wall surface 23b surrounding the bottom surface 23a. Of these, the bottom surface 23a is not provided with irregularities such as ribs, and has a smooth and gentle shape. As shown in FIG. 2, in the horizontal cross section of the trunk | drum 20, the bottom face 23a of the pressure absorption panel 23 has a shape curved inward. As shown in FIG. 3, in the vertical cross section of the body portion 20, the bottom surface 23 a of the pressure absorbing panel 23 has a shape curved inward.

  The operation of the pressure absorbing panel 23 is as follows.

  When the warming plastic container 10 is filled with the content liquid, sealed with a cap (not shown), and then heated, the content liquid in the warming plastic container 10 and the air in the head space are thermally expanded. At this time, when the pressure absorption panel 23 bulges outward, it absorbs such thermal expansion and plays a role of suppressing a problem that a portion other than the pressure absorption panel 23 is deformed. At this time, not only the pressure absorbing panel 23 but also the total height H of the plastic container 10 for heating slightly increases.

  In addition, when the heated plastic container 10 is cooled after being heated, if the heated plastic container 10 is cooled to, for example, room temperature, the content liquid in the warmed plastic container 10 and the air in the head space. Contracts. At this time, the pressure absorbing panel 23 is recessed inward, so that this contraction is absorbed and the deformation of portions other than the pressure absorbing panel 23 is suppressed.

  In general, since the heating plastic container 10 is heated at the time of heating, the pressure absorbing panel 23 is creep-deformed in a swollen state, and even if the heating plastic container 10 is cooled after heating, the pressure absorbing panel 10 23 may maintain a slightly swollen shape. If the pressure absorbing panel 23 swells too much, when the heating plastic container 10 is cooled to room temperature and the inside is depressurized, the pressure absorbing panel 23 may be recessed to make it difficult to absorb the reduced pressure. On the other hand, in the present embodiment, six pressure absorption panels 23 are provided. Thus, by reducing the number of pressure absorption panels 23 to 5 to 7, the width (length in the circumferential direction) of the pressure absorption panel 23 can be increased. Thereby, the pressure absorption panel 23 can be made to move easily (the pressure absorption panel 23 can easily swell or dent), and the inside of the heating plastic container 10 can be heated at the time of heating and cooling after the heating. Can be easily absorbed.

  Such a heating plastic container 10 has an overall height H of 160 mm to 175 mm (referred to as 160 mm or more and 175 mm or less; the same applies hereinafter), a maximum trunk diameter φ of 65 mm to 80 mm, and a capacity of 400 ml to 550 ml. More preferably, it consists of a container having a capacity of 450 ml to 550 ml. As an example, the heating plastic container 10 according to the present embodiment has an overall height H of 171.5 mm, a maximum trunk diameter φ of 73 mm, and a capacity of 516 ml.

(Overall height)
As described above, the heating plastic container 10 according to the present embodiment has an overall height H of 160 mm to 175 mm. In this case, the overall height is increased by about 2 mm by attaching the cap, and the heating plastic container 10 is accommodated in a general bottle warmer even when the total height H is increased by about 1.5 mm by heating. be able to.

  That is, the conventional general plastic container for heating has a capacity of 275 ml to 350 ml, and the total height is about 132 mm to 158 mm. Moreover, many bottle warmers for warming sales installed in retail stores and the like are intended for such warming plastic containers with a capacity of 275 ml to 350 ml. For this reason, if the total height including the cap is 178.5 mm or less, the plastic container for heating can be accommodated in a general bottle warmer. Therefore, by setting the total height H of the warming plastic container 10 to 160 mm to 175 mm, the warming plastic container 10 can be sold in a general bottle warmer.

(Body diameter)
The warming plastic container 10 according to the present embodiment has a maximum body diameter φ of 65 mm to 80 mm as described above. Thereby, even if it is a case where the total height H of the plastic container 10 for heating shall be 160 mm-175 mm, the capacity | capacitance of the plastic container 10 for heating can be 400 ml-550 ml. In general, a rectangular cylindrical plastic container having an internal volume of 500 ml has a diagonal line length of about 72 mm. For this reason, many plastic container production lines and commercially available bottle holders are compatible with plastic containers having a diameter slightly larger than 72 mm. Therefore, by setting the maximum body diameter φ of the warming plastic container 10 to 65 mm to 80 mm, the warming plastic container 10 can be produced without improving the production line. Further, by setting the maximum body diameter φ of the warming plastic container 10 to 65 mm to 80 mm, the warming plastic container 10 can be accommodated in a commercially available bottle holder.

  Such a warming plastic container 10 can be produced by biaxial stretch blow molding of a preform manufactured by injection molding of a synthetic resin material. As a material for the preform, that is, the plastic container 10 for heating, it is preferable to use a thermoplastic resin, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), or PEN (polyethylene naphthalate).

  The heating plastic container 10 may be a single-layer molded container made of the above synthetic resin material (for example, PET). In this case, the weight of the plastic container 10 for heating is 20 to 23 g, for example, 21.8 g.

  Moreover, the plastic container 10 for heating can also be formed as a multilayer molded container having two or more layers. That is, by injection molding or compression molding, for example, the intermediate layer is gas barrier property and light shielding property such as MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer) or PEN (polyethylene naphthalate). A multilayer container having a gas barrier property and a light-shielding property may be formed by blow molding after forming a preform composed of three or more layers as a resin (intermediate layer). In this case, the weight of the plastic container 10 for heating is 20 to 23 g, for example, 21.7 g. In addition, it is preferable to provide such an intermediate | middle layer in the trunk | drum 20 at least among the plastic containers 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 container 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 warming plastic container 10 is filled with a content liquid such as green tea or coffee, and then sealed with a cap (not shown). Furthermore, a label such as a shrink film is attached around the body 20.

  As a method for producing a beverage product using the warming plastic container 10, an aseptic filling method may be used. In this aseptic filling method, the inside of the warming plastic container 10 is sterilized with the drug in an aseptic environment, and then the sterilized warming plastic container 10 is filled with the content liquid at room temperature. When such an aseptic filling method is used, the heating plastic container 10 is not exposed to a high temperature in the manufacturing process. Therefore, a non-heat resistant container in which the mouth portion 11 is not crystallized can be used as the heating plastic container 10 for aseptic filling.

  Then, the plastic container 10 for heating is accommodated in a bottle warmer and sold in a state heated in the bottle warmer. As described above, the heating plastic container 10 has an overall height H of 160 mm to 175 mm. For this reason, the plastic container 10 for heating can be accommodated in a general bottle warmer and heated.

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

  In this case, since each pressure absorption panel 23 of the trunk | drum 20 swells toward the outer side of the trunk | drum 20, when the internal pressure of the plastic container 10 for a heating increases, this internal pressure can be absorbed. Thereby, deformation | transformation of locations other than the pressure absorption panel 23 can be suppressed, and the container external appearance at the time of heating can be maintained favorable.

  On the other hand, it is also conceivable that the heated plastic container 10 for heating is left as it is at room temperature without opening, and is cooled. When the container is thus heated and then cooled, the volume of the contents is reduced, so that the internal pressure of the heating plastic container 10 is reduced.

  In this case, each pressure absorbing panel 23 swelled by heating is recessed toward the inside of the body 20. Thus, since each pressure absorption panel 23 absorbs a pressure-reduced part when each pressure absorption panel 23 dents inward by reducing the internal pressure of a container, deformation | transformation of places other than the pressure absorption panel 23 can be suppressed. . For this reason, the external appearance of the plastic container 10 for a heating can be maintained favorable.

  As described above, according to the present embodiment, although the capacity of the warming plastic container 10 is increased to 400 ml to 550 ml, the warming plastic container 10 is displayed on a general bottle warmer. be able to. In addition, the appearance of the warming plastic container 10 can be satisfactorily maintained both during heating and during cooling after heating.

  Moreover, according to this Embodiment, since the bottom face 23a of each pressure absorption panel 23 was made smooth, it is easy to produce the deformation | transformation of the bottom face 23a. As a result, the appearance of the warming plastic container 10 can be favorably maintained both during heating and during cooling after heating.

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

  First, the following three types of plastic containers for heating (Example 1, Comparative Example 1 and Comparative Example 2) were prepared.

Example 1
A heating plastic container 10 (Example 1) having a capacity of 516 ml having the configuration shown in FIGS. 1 to 3 was produced. In this case, the total height of the heating plastic container 10 was 171.5 mm, and the maximum body diameter was 73 mm.

(Comparative Example 1)
A heating plastic container 100 (Comparative Example 1) having a capacity of 516 ml having the configuration shown in FIGS. 4 to 6 was produced. As shown in FIGS. 4 to 6, the heating plastic container 100 (Comparative Example 1) has a mouth portion 111, a shoulder portion 112, a trunk portion 120, and a bottom portion 130. Further, eight pressure absorbing panels 123 are formed on the cylindrical surface of the body portion 120. In this case, the bottom surface 123a of each pressure absorbing panel 123 is a smooth surface. In this case, the total height of the heating plastic container 100 (Comparative Example 1) was 171.5 mm, and the maximum body diameter was 73 mm.

(Comparative Example 2)
A heating plastic container 200 (Comparative Example 2) having a capacity of 516 ml having the configuration shown in FIGS. 7 to 9 was produced. As shown in FIGS. 7 to 9, the heating plastic container 200 (Comparative Example 2) has a mouth part 211, a shoulder part 212, a body part 220, and a bottom part 230. Also, six pressure absorbing panels 223 are formed on the cylindrical surface of the body 220. In this case, a raised portion 224 bulging outward is formed at the center of each pressure absorbing panel 223. In this case, the total height of the heating plastic container 200 (Comparative Example 2) was 171.5 mm, and the maximum body diameter was 72 mm.

(Test 1: Change after storage at 60 ° C for 2 weeks)
The above three kinds of plastic containers for heating (Example 1, Comparative Example 1 and Comparative Example 2) were each filled with 500 ml of the content liquid (water) and then sealed with a cap. Thereafter, three types of plastic containers for warming (Example 1, Comparative Example 1 and Comparative Example 2) were heated by a heater (Japan Heater Equipment Co., Ltd.) with the heater output adjusted to an average liquid temperature of 60 ° C ( Product number: TW75-C3). The reason why the average liquid temperature is set to 60 ° C. is that the setting of a hot warmer installed in a retail store or the like is generally 55 ° C., which is a slightly severer condition. It preserve | saved for 2 weeks in this state, and measured the dimension of each plastic container for a heating. Thereafter, each plastic heating container was cooled to room temperature, and the deformation of each plastic heating container was measured. It was determined that the total height displacement after heating was 1.5 mm or less and that there was no abnormal deformation (for example, inversion of the bottom or deformation other than the pressure absorbing panel) when cooled to room temperature ( (See Table 1).

(Test 2: Change after storage at 70 ° C. for 4 hours)
Next, three types of plastic containers for warming (Example 1, Comparative Example 1 and Comparative Example 1) were used for evaluation under quick and harsh conditions and assuming that the temperature of the hot warmer temporarily overshooted. Comparative Example 2) was stored in the hot warmer with the heater output adjusted to an average liquid temperature of 70 ° C., stored for 4 hours, and evaluated in the same manner as described above (see Table 1). However, the criterion was only that there was no abnormal deformation (for example, reversal of the bottom or deformation of parts other than the pressure absorbing panel) when cooled to room temperature.

  As a result, the heating plastic container 10 of Example 1 has a total height displacement of 1.5 mm or less after heating for Test 1 (stored at 60 ° C. for 2 weeks) and Test 1 (2 at 60 ° C. 2). No abnormal deformation occurred when cooled to room temperature for both weekly storage and Test 2 (4 hours storage at 70 ° C.).

  On the other hand, for the heating plastic container 100 of Comparative Example 1, the total height displacement during Test 1 (stored at 60 ° C. for 2 weeks) was large, and the total height displacement after heating exceeded 1.5 mm. Further, in both Test 1 (stored at 60 ° C. for 2 weeks) and Test 2 (stored at 70 ° C. for 4 hours), abnormal deformation occurred when cooled to room temperature, and the appearance of the container was damaged.

  Moreover, about the heating plastic container 200 of the comparative example 2, about 2nd test (stored at 70 degreeC for 4 hours), when it cooled to room temperature, the abnormal deformation | transformation produced and the container external appearance was impaired.

  From this, the heating plastic container 10 according to the present embodiment (Example 1) has a total height displacement of 1.5 mm or less after heating by storage at 60 ° C. for 2 weeks, and at 60 ° C. for 2 weeks. It was confirmed that no abnormal deformation occurred when cooled to room temperature in both storage and storage at 70 ° C. for 4 hours.

DESCRIPTION OF SYMBOLS 10 Heating plastic container 11 Mouth part 12 Shoulder part 20 Body part 21 Cylindrical surface 22 Columnar part 23 Pressure absorption panel 27 Horizontal rib 30 Bottom part 31 Recessed part

Claims (5)

In a plastic container for heating having a capacity of 400 ml to 550 ml,
The mouth,
A shoulder provided below the mouth;
A trunk provided below the shoulder;
A bottom portion provided below the trunk portion,
The body portion has a substantially cylindrical shape having a cylindrical surface,
5-7 pressure absorption panels are provided on the cylindrical surface of the body portion at predetermined intervals in the circumferential direction,
Each pressure absorbing panel has a concave shape toward the inside,
A plastic container for heating characterized by having an overall height of 160 mm to 175 mm.   6. The heating plastic container according to claim 1, wherein six pressure absorbing panels are provided.   2. The plastic container for heating according to claim 1, wherein each pressure absorption panel has a smooth bottom surface not provided with irregularities.   The body diameter of the cylindrical body is 65 mm to 80 mm, and the plastic container for heating according to any one of claims 1 to 3.   The heating plastic container according to any one of claims 1 to 4, wherein the mouth is not crystallized.

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