JP2021113090A - Synthetic resin container - Google Patents

Abstract

To provide a synthetic resin container capable of effectively avoiding such a trouble that the container is too hot to grasp even if the temperature of a content liquid is high.SOLUTION: A container 1 comprises a mouth 2, a shoulder 3, a barrel 4 and a bottom 5. In the barrel 4, a plurality of recesses 40 recessed into the container are provided along a circumferential direction, in which a center angle θ1 of the recess 40 relative to its breadth w is given 20-70° and a ratio d/w of a depth d at a breadthways center of the recess 40 relative to its breadth w is given 0.07-0.4.SELECTED DRAWING: Figure 1

Description

The present invention relates to a synthetic resin container.

Conventionally, a synthetic resin obtained by producing a bottomed tubular preform by injection molding or compression molding using a thermoplastic resin such as polyethylene terephthalate, and molding this preform into a bottle by biaxial blow molding. Manufacturing containers are used in a wide range of fields as containers containing various beverages, various seasonings, and the like as content liquids.

Further, as such a container made of synthetic resin, a container having various functions has been proposed in order to meet the demands of the market. For example, in Patent Document 1, a container having enhanced heat retention and cold retention effects is provided. Proposed.

Japanese Unexamined Patent Publication No. 2003-40357

By the way, for example, instant soup foods such as potage soup, consomme soup, and miso soup have been known for some time. In the case of such instant soup foods, a package containing the soup base processed into powder or paste is provided on the market in a state of being enclosed in a cup-shaped heat insulating container. It is also known that the user who purchased the package can take out the package, open the package, and pour boiling water into the soup base returned to the heat-insulated container to eat.

The present inventors have been studying to make it possible to use a synthetic resin container as described above instead of the cup-shaped heat insulating container used for such instant soup foods. In the process of such an examination, it is sufficient for a high-temperature content liquid such as boiling water to provide a vertical groove-shaped unevenness on the container and provide a gap between the container and the shrink label as in Patent Document 1. It has been found that the problem that the container is too hot to grip when the temperature of the content liquid is high cannot be solved because the heat insulating effect is not exhibited, and as a result of further studies, the present invention has been completed.

The synthetic resin container according to the present invention is a synthetic resin container provided with a mouth portion, a shoulder portion, a body portion, and a bottom portion, and a plurality of recesses recessing into the inside of the container are formed in the body portion in the circumferential direction. The central angle with respect to the width of the recess is 20 to 70 °, and the ratio of the depth at the center in the width direction to the width of the recess is 0.07 to 0.4. be.

According to the present invention, even if the temperature of the content liquid is high, it is possible to effectively avoid a problem that the container is too hot to be gripped.

It is a perspective view which shows the outline of the synthetic resin container which concerns on 1st Embodiment of this invention. It is a front view which shows the outline of the synthetic resin container which concerns on 1st Embodiment of this invention. FIG. 2 is an end view taken along the line AA of FIG. It is a perspective view which shows the outline of the modification of the synthetic resin container which concerns on 1st Embodiment of this invention. It is a front view which shows the outline of the modification of the synthetic resin container which concerns on 1st Embodiment of this invention. It is a perspective view which shows the outline of the other modification of the synthetic resin container which concerns on 1st Embodiment of this invention. It is a front view which shows the outline of the other modification of the synthetic resin container which concerns on 1st Embodiment of this invention. It is a perspective view which shows the outline of the other modification of the synthetic resin container which concerns on 1st Embodiment of this invention. It is a front view which shows the outline of the other modification of the synthetic resin container which concerns on 1st Embodiment of this invention. FIG. 9 is a DD end view of FIG. It is a perspective view which shows the outline of the synthetic resin container which concerns on 2nd Embodiment of this invention. It is a front view which shows the outline of the synthetic resin container which concerns on 2nd Embodiment of this invention. It is a top view which shows the outline of the synthetic resin container which concerns on 2nd Embodiment of this invention. FIG. 12 is an end view of EE of FIG. It is a perspective view which shows the outline of the modification of the synthetic resin container which concerns on 2nd Embodiment of this invention. It is a front view which shows the outline of the modification of the synthetic resin container which concerns on 2nd Embodiment of this invention. It is a top view which shows the outline of the modification of the synthetic resin container which concerns on 2nd Embodiment of this invention. FIG. 16 is an end view taken along the line FF of FIG. It is a perspective view which shows the outline of the other modification of the synthetic resin container which concerns on 2nd Embodiment of this invention. It is a front view which shows the outline of the other modification of the synthetic resin container which concerns on 2nd Embodiment of this invention. It is a top view which shows the outline of the other modification of the synthetic resin container which concerns on 2nd Embodiment of this invention. It is a GG end view of FIG. It is explanatory drawing which shows the part which measured the surface temperature of shrink label L in Examples 1-7, and Comparative Example 1.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
First, the first embodiment of the present invention will be described.
FIG. 1 is a perspective view showing an outline of a synthetic resin container according to the present embodiment, and FIG. 2 is a front view of the same. FIG. 3 is an end view taken along the line AA of FIG. 2, and in FIG. 3, the wall thickness appearing on the end face is omitted.

In the container 1 shown in these figures, for example, as an instant soup food such as potage soup, consomme soup, and miso soup, a package containing soup base processed into powder or paste is enclosed in the container. It is offered to the market in the state of being prepared, and the user who purchased the package can take it out of the container, open it, and pour boiling water into the soup base returned to the container to eat it. An example of the configuration is shown.
Needless to say, the soup base can be suitably used even when the soup base is not contained in the package but is enclosed in the container as it is.

Further, in the container 1 shown in these figures, a bottomed tubular preform is formed by injection molding or compression molding using a thermoplastic resin, and this preform is formed into a predetermined container by biaxial stretching blow molding or the like. It can be manufactured by molding into a shape.

As the thermoplastic resin to be used, any resin capable of blow molding can be used. Specifically, thermoplastic polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, amorphous polyarylate, polylactic acid, polyethylene furanoate or copolymers thereof can be used, and in particular, ethylene terephthalate such as polyethylene terephthalate can be used. A thermoplastic polyester is preferably used. Two or more of these resins may be mixed, or other resins may be blended. Polycarbonate, acrylonitrile resin, polypropylene, propylene-ethylene copolymer, polyethylene, etc. can also be used. The preform is not limited to being molded into a single layer, but can also be molded into multiple layers including a gas barrier layer and the like, depending on the characteristics required for the container 1.

In the illustrated example, the container 1 includes a mouth portion 2, a shoulder portion 3, a body portion 4, and a bottom portion 5, and the package is taken out from the mouth portion 2 or the mouth portion 2 is attached to a hot soup. The diameter of the cylindrical mouth portion 2 is formed to be relatively large in consideration of eating and the like.
The mouth portion 2 may be crystallized in order to prevent deformation due to high temperature.

A screw thread 20 for attaching a lid (not shown) is provided on the side surface of the mouth 2 on the opening end side, and the container 1 is resealed by the lid that can be attached to and detached from the mouth 2 by screwing. I am trying to stop it. Thereby, for example, the resealed container 1 can be shaken after pouring hot water so that the soup base can be easily dissolved. If it is not possible to eat all at once, the container 1 can be resealed each time, and the container 1 can be eaten or carried over time.

The lower end of the mouth portion 2 is connected to the shoulder portion 3 that expands in diameter toward the body portion 4 and connects the mouth portion 2 and the body portion 4. In the illustrated example, the shoulder portion 3 is formed in a substantially truncated cone shape, but the shape of the shoulder portion 3 is not limited to the illustrated example.

The body portion 4 occupies most of the height direction of the container 1, and the upper end is connected to the shoulder portion 3 and the lower end is connected to the bottom portion 5.

Here, the height direction means a direction orthogonal to the horizontal plane when the container 1 is upright on the horizontal plane with the mouth portion 2 facing up, and the container 1 is in this state (the state shown in FIG. 2). The vertical and horizontal directions and the vertical and horizontal directions of the above shall be specified.
Further, although the central axis C is shown by a chain line in FIG. 2, unless otherwise specified, a cross section cut along a plane orthogonal to the central axis C is referred to as a cross section.

In the present embodiment, the body portion 4 is provided with a plurality of recesses 40 that are recessed into the inside of the container along the circumferential direction. In the illustrated example, the four recesses 40 are arranged at equal intervals along the circumferential direction.

It is preferable that each of the recesses 40 provided in the body portion 4 is provided so that the contour thereof is square or rectangular. In the example shown in FIGS. 1 to 3, each of the recesses 40 provided in the body portion 4 has a short side in the width direction and a long side having a rectangular shape extending from the upper end side to the lower end side of the body portion 4. It is provided in. When the recess 40 is provided so as to have a square shape or a rectangular shape, the recess 40 may be provided so that the shape when viewed from the front can be generally regarded as a square shape or a rectangular shape, as follows. It can also be provided.

For example, as shown in FIGS. 4 and 5, each of the recesses 40 provided in the body 4 is moved up and down by a partition 41 formed in the center in the height direction with respect to the examples shown in FIGS. It can also be provided so that it is divided into two parts.
Further, as shown in FIGS. 6 and 7, each of the recesses 40 provided in the body portion 4 is formed so as to bulge downward of the recess 40 with respect to the examples shown in FIGS. 1 to 3. The portion 42 may be provided so that the length on the long side is shortened.
4 is a perspective view showing an outline of a modified example of the present embodiment, FIG. 5 is a front view of the same, and FIG. 6 is a perspective view showing an outline of another modified example of the present embodiment, FIG. 7. Is the same front view. Since the BB end view of FIG. 5 and the CC end view of FIG. 7 appear the same as those of FIG. 3, FIG. 3 is also used.

Considering moldability, mold opening after molding, mold releasability, etc., each of the recesses 40 provided in the body 4 has a bottom at the center in the width direction, and the container is inclined from each end edge toward the bottom. It is preferable to provide them symmetrically so as to intrude inward.

Further, each of the recesses 40 provided in the body portion 4 is provided with a predetermined width w. The width w of the recess 40 is the central angle θ _{1 with respect to the width w of the recess 40, that is, the angle θ 1} formed by the line connecting each of both edges of the recess 40 in the width direction and the central axis C in the cross section (FIG. 3). (See) can be set to be 20 to 70 °, preferably 35 to 70 °.
In the illustrated example, the central angle θ _{1 is set} to 45 °.

Further, each of the recesses 40 provided in the body portion 4 is provided with a predetermined depth. The depth of the recess 40 is such that the ratio d / w of the depth d at the center in the width direction to the width w of the recess 40 in the cross section is 0.07 to 0.4, preferably 0.1 to 0.4. More preferably, it can be set to 0.15 to 0.4.
In the illustrated example, the ratio d / w is set to 0.203.

The container 1 is usually attached by covering the container 1 with a heat-shrinkable film material having a desired print in a tubular shape, heating the container 1 and shrinking the film material so as to be in close contact with the peripheral surface of the container 1. A so-called shrink label L is attached. When the shrink label L is attached to the container 1, the shrink label L is stretched between the edges of the recess 40 at the portion where the recess 40 is provided, and the shrink label L does not adhere to the container 1 but is attached to the recess 40. It is mounted so as to form a gap between the two (see FIG. 1).

Therefore, according to the present embodiment, in the above-mentioned use, when hot water is poured into the container 1, the shrink label L is affected by the heat insulating action of the air in the gap formed between the shrink label L and the recess 40. Heat conduction can be suppressed. Therefore, if the container 1 is gripped so as to attach a finger to the portion stretched between the edges of the recess 40 of the shrink label L attached to the container 1, the container 1 is too hot to be gripped. Problems can be effectively avoided.

In FIG. 1, the shrink label L is indicated by a chain line, and the shrink label L is attached in a range extending from the upper end side of the shoulder portion 3 to the lower end side of the body portion 3, but the range in which the shrink label L is attached. Is not limited to this. It suffices if the shrink label L is attached to a range including the recess 40 and heat conduction to a portion stretched between the edges of the recess 40 of the shrink label L can be suppressed.

Further, the portion of the shrink label L stretched between the edges of the recess 40 may be printed so as to serve as a mark. By doing so, when gripping the container 1, the container 1 is too hot by making the user aware that the finger is attached to the portion stretched between the edges of the recess 40 of the shrink label L. This is preferable because it is possible to more effectively avoid problems such as being unable to grip.

Considering moldability and the like, it is preferable to add R to the corner portion of the recess 40, but when the R of the corner portion becomes large, the portion stretched between the edges of the recess 40 of the shrink label L, that is, shrink. The area of the portion where the heat conduction of the label L is suppressed is reduced. Therefore, it is preferable that the corner portion of the recess 40 is angular within a range that does not hinder molding.

Further, the edge of the recess 40 may be curved inward or outward so as not to significantly reduce the area of the portion stretched between the edges of the recess 40 of the shrink label L. When both edges of the recess 40 in the width direction are curved inward, the minimum width thereof is defined as the width w of the recess 40. When both edges of the recess 40 in the width direction are curved outward, the maximum width thereof is defined as the width w of the recess 40.

In order to secure the area of the portion stretched between the edges of the recess 40 of the shrink label L, the recess 40 is preferably provided so as to have a square shape or a rectangular shape, but the area of the portion is sufficient. If it can be secured, it may be provided so as to have a circular shape, an elliptical shape, or a polygonal shape.

In order to suppress heat conduction to the shrink label L, the volume of air in the gap formed between the shrink label L and the recess 40, particularly the volume along the cross section is set to a certain value or more. It is necessary to provide 40. _{From such a viewpoint, the ratio d / w of the central angle θ 1} with respect to the width w of the recess 40 and the depth d at the center in the width direction with respect to the width w of the recess 40 is determined. If these are less than the above range, it becomes impossible to secure a gap between the shrink label L and the recess 40 so that a sufficient heat insulating effect can be obtained, and it becomes difficult to suppress heat conduction to the shrink label L.

Further, for example, when the body portion 4 is formed into a cylindrical shape or a square tubular shape that closely resembles a cylinder _{, the larger the central angle θ 1} with respect to the lateral width w of the concave portion 40, the greater the tension between the edges of the concave portion 40. The position of the shrink label L to be formed is a position closer to the inside of the container. In such a case, if the central angle θ ₁ with respect to the width w of the recess 40 exceeds the above range, it becomes difficult to secure a gap between the shrink label L and the recess 40 to obtain a sufficient heat insulating effect. It ends up.

_{Further, when the central angle θ 1} with respect to the lateral width w of the concave portion 40 becomes large, it becomes difficult to secure a sufficient lateral stretching ratio, uneven thickness tends to occur in the body portion 4, and the shapeability of the body portion 4 is poor. There is also a risk of problems such as becoming.

Further, if the ratio d / w of the depth d at the center in the width direction to the width w of the recess 40 exceeds the above range and the recess 40 is provided so as to be deep, moldability, mold opening after molding, and mold releasability are improved. It is disadvantageous in making it good, and it is also disadvantageous in securing the capacity of the container 1.

Further, when providing the plurality of recesses 40 in the body 4 along the circumferential direction, the central angle θ _{2 with} respect to the distance between the recesses 40 adjacent in the circumferential direction, that is, one recess 40 adjacent in the circumferential direction in the cross section. _{The recess 40 is formed so that the angle θ 2} (see FIG. 3) formed by the line connecting each of the widthwise edge of the recess 40 and the other recess 40 and the central axis C is 10 to 45 °. It is preferable to dispose of it.
In the illustrated example, the central angle θ _{2 is set} to 45 °.

If the central angle θ ₂ is less than the above range, there are problems such as the strength of the portion between the recesses 40 cannot be sufficiently secured and the shapeability of the body portion 4 deteriorates. It may occur. On the other hand, if the central angle θ ₂ exceeds the above range, there is a risk that the width w of the recess 40 cannot be sufficiently secured.

_{8 to 10 show an example in which the central angle θ 2} with respect to the distance between the recesses 40 adjacent to each other in the circumferential direction is reduced and the width w of the recess 40 is increased accordingly with respect to the examples shown in FIGS. show.

FIG. 8 is a perspective view showing an outline of another modification of the present embodiment, and FIG. 9 is a front view of the same. FIG. 10 is a DD end view of FIG. 9, and in FIG. 10, the wall thickness appearing on the end face is omitted.

In the examples shown in FIGS. 8 to 10, the central angle θ ₁ with respect to the width w of the recess 40 is 68 °, and the ratio d / w of the depth d at the center in the width direction to the width w of the recess 40 is 0.141. With respect to the examples shown in FIGS. 1 to 3, a rectangular recess 40 having a long width w is provided while keeping the length in the height direction the same. The four recesses 40 provided in this way are arranged along the circumferential direction so that the _{central angle θ 2} with respect to the distance between the recesses 40 adjacent in the circumferential direction is 22 °.

[Second Embodiment]
Next, the second embodiment of the present invention will be described.
FIG. 11 is a perspective view showing an outline of the synthetic resin container according to the present embodiment, FIG. 12 is a front view of the same, and FIG. 13 is a plan view of the same. FIG. 14 is an end view of EE of FIG. 12, and in FIG. 14, the wall thickness appearing on the end face is omitted.

In the present embodiment, the container 1 extends along the height direction from the upper end side of the shoulder portion 3 to the lower end side of the body portion 4 while constricting the portion near the upper end of the body portion 4. The valleys 43 are provided at predetermined intervals along the circumferential direction, and are formed into a substantially cylindrical container shape in which the valleys 43 adjacent to each other in the circumferential direction are the ridges 44. In the example shown in FIGS. 11 to 14, eight valley portions 43 and eight ridge portions 44 are alternately arranged at equal angular intervals along the circumferential direction.

Then, in the present embodiment, a plurality of square or rectangular concave portions recessed into the container so as to be arranged corresponding to each of the valley portions 43 in the constricted portion on the upper end side of the body portion 4. 40 is provided along the circumferential direction.

In the examples shown in FIGS. 11 to 14, the central angle θ ₁ with respect to the width w of the recess 40 was 34 °, and the ratio d / w of the depth d at the center in the width direction to the width w of the recess 40 was 0.184. A rectangular recess 40 having a short side in the width direction is provided. Then, the eight recesses 40 provided in this way have a valley portion in the constricted portion on the upper end side of the body portion 4 so that the _{central angle θ 2} with respect to the distance between the recesses 40 adjacent in the circumferential direction is 11 °. It is arranged corresponding to each of 43.
In the present embodiment, the length of the recess 40 in the height direction can be set to about one finger in consideration of the size of a general human finger.

Further, in the present embodiment, by increasing or decreasing the number of valley portions 43 and ridge portions 44 alternately arranged along the circumferential direction and adjusting the width of the valley portions 43, the width of the recess 40 is adjusted accordingly. w can be adjusted.

In the examples shown in FIGS. 15 to 18, the width of the valleys 43 is set so that the nine valleys 43 and the nine ridges 44 are alternately arranged at equal intervals along the circumferential direction. By narrowing it, the width w of the recess 40 is shortened accordingly.

15 is a perspective view showing an outline of a modified example of the present embodiment, FIG. 16 is a front view of the same, and FIG. 17 is a plan view of the same. FIG. 18 is an FF end view of FIG. 16, and in FIG. 18, the wall thickness appearing on the end face is omitted.

In the examples shown in FIGS. 15 to 18, the central angle θ ₁ with respect to the width w of the recess 40 is 20 °, and the ratio d / w of the depth d at the center in the width direction to the width w of the recess 40 is 0.281. With respect to the examples shown in 11 to 14, a rectangular recess 40 having a shorter width w is provided while keeping the length in the height direction the same. Then, the nine recesses 40 provided in this way have a valley portion in the constricted portion on the upper end side of the body portion 4 so that the _{central angle θ 2} with respect to the distance between the recesses 40 adjacent in the circumferential direction is 20 °. It is arranged corresponding to each of 43.

Further, in the present embodiment, for example, as shown in FIGS. 19 to 22, the width of the valley portion 43 is changed every other along the circumferential direction by changing the interval between the ridge portions 44 adjacent to each other in the circumferential direction. It is also possible to arrange the recess 40 corresponding to each of the widened valley portions 43. By doing so, the width w of the recess 40 can be lengthened according to the width of the widened valley portion 43.

FIG. 19 is a perspective view showing an outline of another modification of the present embodiment, FIG. 20 is a front view of the same, and FIG. 21 is a plan view of the same. FIG. 22 is a view of the GG end face of FIG. 20, and in FIG. 22, the wall thickness appearing on the end face is omitted.

In the examples shown in FIGS. 19 to 22, the central angle θ ₁ with respect to the width w of the recess 40 is 46 °, and the ratio d / w of the depth d at the center in the width direction to the width w of the recess 40 is 0.07. With respect to the examples shown in 11 to 14, a rectangular recess 40 having a long width w is provided while keeping the length in the height direction the same. Then, the width of the four recesses 40 provided in this way at the constricted portion on the upper end side of the body portion 4 is set so that the _{central angle θ 2} with respect to the distance between the recesses 40 adjacent in the circumferential direction is 44 °. It is arranged corresponding to each of the widened valley portions 43.

As described above, the present embodiment is different from the above-described first embodiment in the above points, but since the other configurations are common to the above-mentioned first embodiment, duplicate description will be omitted.

Hereinafter, the present invention will be described in more detail with reference to specific examples.

[Example 1]
A preform weighing about 26 g was injection-molded using a polyethylene terephthalate resin. After the molded preform was heated and softened, it was set in a blow molding mold, and the container 1 was produced so as to have the container shape shown in FIGS. 1 to 3 by biaxial stretching blow molding. Next, as shown in FIG. 1, the shrink label L was attached from the upper end side of the shoulder portion 3 to the lower end side of the body portion 3.
The capacity of the container 1 was about 280 mL, the height was about 130 mm, and the maximum body diameter was about 66 mm. The average wall thickness of the container 1 calculated from the weight of the preform was about 0.23 mm.

Hot water was poured from an electric kettle into the container 1 to which the shrink label L was attached, and the surface temperature of the shrink label L at the portions a to c shown in FIG. 23 was measured. The results are shown in Table 1.
The room temperature at the time of measurement is 20 ° C., the set temperature of the electric pot is 80 ° C., and the measured values of the liquid temperature in the container 1 at the time of measurement are also shown in Table 1.

※評価：低温熱傷が発症する温度と接触時間との関係に基づいて、シュリンクラベルＬの表面温度が、凹部４０の端縁間に張架された部分で５３℃未満であるものを「◎」、５３℃以上５５℃未満であるものを「〇」、５５℃以上６０℃未満であるものを「△」、６０℃以上であるものを「×」とした。

* Evaluation: Based on the relationship between the temperature at which low-temperature burns occur and the contact time, the surface temperature of the shrink label L is less than 53 ° C at the portion stretched between the edges of the recess 40. , 53 ° C. or higher and lower than 55 ° C. was designated as “◯”, 55 ° C. or higher and lower than 60 ° C. was designated as “Δ”, and those having 60 ° C. or higher was designated as “x”.

[Example 2]
The surface temperature of the shrink label L at the portions a to c shown in FIG. 23 was measured in the same manner as in Example 1 except that the container 1 was prepared so as to have the container shape shown in FIGS. 4 and 5. The results are also shown in Table 1.

[Example 3]
The surface temperature of the shrink label L at the portions a to c shown in FIG. 23 was measured in the same manner as in Example 1 except that the container 1 was prepared so as to have the container shape shown in FIGS. 6 and 7. The results are also shown in Table 1.

[Example 4]
The surface temperature of the shrink label L at the portions a to c shown in FIG. 23 was measured in the same manner as in Example 1 except that the container 1 was prepared so as to have the container shape shown in FIGS. 8 to 10. The results are also shown in Table 1.

[Example 5]
The surface temperature of the shrink label L at the portions a to c shown in FIG. 23 was measured in the same manner as in Example 1 except that the container 1 was prepared so as to have the container shape shown in FIGS. 11 to 14. The results are also shown in Table 1.

[Example 6]
The surface temperature of the shrink label L at the portions a to c shown in FIG. 23 was measured in the same manner as in Example 1 except that the container 1 was prepared so as to have the container shape shown in FIGS. 15 to 18. The results are also shown in Table 1.

[Example 7]
The surface temperature of the shrink label L at the portions a to c shown in FIG. 23 was measured in the same manner as in Example 1 except that the container 1 was prepared so as to have the container shape shown in FIGS. 19 to 22. The results are also shown in Table 1.

[Comparative Example 1]
With respect to the fifth embodiment, twelve valley portions 43 and twelve ridge portions 44 are alternately arranged at equal angular intervals along the circumferential direction, and the central angle θ ₁ with respect to the width w of the recess 40 is 15 ° and the recess. The ratio d / w of the depth d at the center in the width direction to the width w of 40 is 0.164, and the width w is shortened with respect to the fourth embodiment while keeping the length in the height direction the same. The twelve recesses 40 correspond to each of the valleys 43 in the constricted portion on the upper end side of the body 4 so that the _{central angle θ 2} with respect to the distance between the recesses 40 adjacent in the circumferential direction is 15 °. The surface temperature of the shrink label L at the portions a to c shown in FIG. 23 was measured in the same manner as in Example 5 except that the surfaces were arranged in the same manner. The results are also shown in Table 1.

Although the present invention has been described above with reference to preferred embodiments, it goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. Nor.

For example, the use of the synthetic resin container according to the present invention is not limited to the above-mentioned use. It can also be used for so-called heated sales, in which the content liquid is heated and sold by a warmer such as a hot warmer installed in the store.
Further, the capacity of the synthetic resin container according to the present invention is not particularly limited, but it can be particularly preferably applied to a container having a capacity of about 150 to 500 mL.

In short, in the synthetic resin container according to the present invention, each of the recesses 40 provided in the body 4 has a central angle θ ₁ with respect to the width w of the recess 40 of 20 to 70 °, and the center of the recess 40 in the width direction with respect to the width w. If the ratio d / w of the depth d is 0.07 to 0.4, the configuration of other details can be appropriately changed without being limited to the above-described embodiment. The surface of the container 1 may be decorated with, for example, a blow-molded cavity surface processed into knurled or mesh-like irregularities and transferred. As a result, it can be expected that the surface temperature of the attached shrink label will be further lowered.

1 Container 2 Mouth 3 Shoulder 4 Body 5 Bottom 40 Recess w Recess width d Recess width direction Center depth L Shrink label

Claims (6)

A synthetic resin container having a mouth, shoulders, body, and bottom.
A plurality of recesses that are recessed into the inside of the container are provided in the body portion along the circumferential direction.
The central angle with respect to the lateral width of the recess is 20 to 70 °.
A synthetic resin container characterized in that the ratio of the depth at the center in the width direction to the width of the recess is 0.07 to 0.4. The synthetic resin container according to claim 1, wherein the central angle with respect to the lateral width of the recess is 35 to 70 °. The synthetic resin container according to claim 1 or 2, wherein the ratio of the depth at the center in the width direction to the width of the recess is 0.15 to 0.4. The synthetic resin container according to any one of claims 1 to 3, wherein the recess is provided in a square shape or a rectangular shape. The synthetic resin container according to any one of claims 1 to 4, wherein the central angle with respect to the distance between the recesses adjacent to each other in the circumferential direction is 10 to 45 °. The synthetic resin container according to any one of claims 1 to 5, wherein a shrink label is attached to a range including the recess.

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