JP7400567B2 - Synthetic resin container - Google Patents

Description

The present invention relates to a synthetic resin container.

Traditionally, thermoplastic resins such as polyethylene terephthalate are used to create a cylindrical preform with a bottom by injection molding or compression molding, and this preform is then molded into a bottle shape by biaxial stretch blow molding. BACKGROUND ART Containers are used in a wide range of fields as containers for containing liquids such as various beverages and various seasonings.

In addition, such synthetic resin containers have been proposed that are equipped with various functions in order to meet market demands. For example, Patent Document 1 describes a container with enhanced heat retention and cold retention effects. Proposed.

Japanese Patent Application Publication No. 2003-40357

By the way, instant soup foods such as potage soup, consommé soup, and miso soup have been known for some time. In such instant soup foods, packages containing soup base processed into powder or paste form are provided on the market in a cup-shaped insulated container. It is also known that the user who purchased the soup can take out the package, open it, and pour boiling water over the soup stock that has been returned to the heat-insulating container.

The present inventors have made repeated studies to make it possible to use a synthetic resin container as described above in place of the cup-shaped heat-insulating container used for such instant soup foods. In the process of such studies, we found that simply providing a vertical groove-like unevenness on the container and creating a gap between it and the shrink label, as in Patent Document 1, was insufficient for high-temperature contents such as boiling water. It was discovered that if the temperature of the liquid inside the container is too high and the temperature of the liquid inside is too high, the problem of the container being too hot to grip cannot be solved, and as a result of further studies, the present invention was completed.

The synthetic resin container according to the present invention is a synthetic resin container comprising a mouth, a shoulder, a body, and a bottom, wherein the body has a center portion in the width direction that is invaginated deepest into the container. A plurality of recesses are provided along the circumferential direction, the center angle of the recesses relative to the width thereof is 20 to 70°, and the ratio of the depth of the center of the width direction to the width of the recesses is 0.07 to 70°. 0.4, a shrink label attached to an area including the recess is stretched between the edges of the recess, and the air in the gap formed between the shrink label and the recess has a heat insulating effect. The structure is designed to demonstrate this .

According to the present invention, even if the temperature of the content liquid is high, it is possible to effectively avoid problems such as the container being too hot to be gripped.

1 is a perspective view schematically showing a synthetic resin container according to a first embodiment of the present invention. FIG. 1 is a front view schematically showing a synthetic resin container according to a first embodiment of the present invention. FIG. 3 is an end view taken along the line AA in FIG. 2; It is a perspective view showing an outline of a modification of a synthetic resin container concerning a first embodiment of the present invention. It is a front view showing the outline of the modification of the synthetic resin container concerning the first embodiment of the present invention. It is a perspective view showing the outline of another modification of the synthetic resin container concerning the first embodiment of the present invention. FIG. 3 is a front view schematically showing another modification of the synthetic resin container according to the first embodiment of the present invention. It is a perspective view showing the outline of another modification of the synthetic resin container concerning the first embodiment of the present invention. FIG. 3 is a front view schematically showing another modification of the synthetic resin container according to the first embodiment of the present invention. FIG. 9 is an end view taken along line DD in FIG. 9; It is a perspective view showing an outline of a synthetic resin container concerning a second embodiment of the present invention. FIG. 3 is a front view schematically showing a synthetic resin container according to a second embodiment of the present invention. FIG. 2 is a plan view schematically showing a synthetic resin container according to a second embodiment of the present invention. 13 is an EE end view of FIG. 12. FIG. It is a perspective view showing an outline of a modification of a synthetic resin container concerning a second embodiment of the present invention. It is a front view showing the outline of the modification of the synthetic resin container concerning the second embodiment of the present invention. It is a top view showing the outline of the modification of the synthetic resin container concerning the second embodiment of the present invention. 17 is an FF end view of FIG. 16. FIG. It is a perspective view showing the outline of another modification of a synthetic resin container concerning a second embodiment of the present invention. FIG. 7 is a front view schematically showing another modification of the synthetic resin container according to the second embodiment of the present invention. FIG. 7 is a plan view schematically showing another modification of the synthetic resin container according to the second embodiment of the present invention. 21 is an end view taken along line GG in FIG. 20. FIG. FIG. 3 is an explanatory diagram showing the portions where the surface temperatures of the shrink labels L in Examples 1 to 7 and Comparative Example 1 were measured.

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

[First embodiment]
First, a first embodiment of the present invention will be described.
FIG. 1 is a perspective view schematically showing a synthetic resin container according to the present embodiment, and FIG. 2 is a front view thereof. FIG. 3 is an AA end view of FIG. 2, and in FIG. 3, the wall thickness appearing on the end surface is omitted.

The container 1 shown in these figures is a container in which a package containing a soup base processed into powder or paste form is enclosed in the container, for example, as an instant soup food such as potage soup, consommé soup, or miso soup. The packaged product is provided on the market in a packaged state, and the user who purchases the product can take out the package from the container, open it, and pour boiling water over the soup stock that is returned to the container and eat it. An example of such a configuration is shown.
It goes without saying that the soup base can also be suitably used when it is not housed in a package but is enclosed in a container as it is.

In addition, the container 1 shown in these figures is made by molding a bottomed cylindrical preform using thermoplastic resin by injection molding, compression molding, etc., and molding this preform into a predetermined container by biaxial stretch blow molding, etc. It can be manufactured by molding it into a shape.

As the thermoplastic resin used, any resin that can be blow molded 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. Thermoplastic polyesters are 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 formed into a single layer, but can also be formed into a multilayer structure including a gas barrier layer, depending on the characteristics required of the container 1.

In the illustrated example, the container 1 has a mouth part 2, a shoulder part 3, a body part 4, and a bottom part 5, and the package can be taken out from the mouth part 2, or hot soup can be poured by putting the mouth on the mouth part 2. In consideration of eating, etc., the diameter of the cylindrical mouth portion 2 is formed to be relatively large.
Note that the mouth portion 2 may be crystallized to prevent deformation due to high temperatures.

A screw thread 20 for attaching a lid (not shown) is provided on the side surface of the opening end of the spout 2, and the container 1 can be resealed by the lid that can be attached to and detached from the spout 2 by screwing. I am able to stop it. Thereby, for example, by pouring boiling water and shaking the resealed container 1, it is possible to stir the soup base so that it dissolves easily. If you cannot eat all the food at once, you can reseal the container 1 each time and eat it over time or carry it around.

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

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

Here, the height direction refers to a direction perpendicular to a horizontal plane when the container 1 is erected on a horizontal plane with the mouth 2 facing upward. shall specify the vertical and horizontal directions as well as the vertical and horizontal directions.
Further, in FIG. 2, the central axis C is shown by a dashed line, but unless otherwise specified, a cross section cut along a plane perpendicular to the central axis C is referred to as a cross section.

In this embodiment, the body portion 4 is provided with a plurality of recesses 40 extending in the circumferential direction and recessed into the container. In the illustrated example, four recesses 40 are arranged at equal angular intervals along the circumferential direction.

It is preferable that each of the recesses 40 provided in the body portion 4 is provided so that its outline is square or rectangular. In the example shown in FIGS. 1 to 3, each of the recesses 40 provided in the body 4 has a rectangular shape with the width direction being the short side and the long side extending from the upper end of the body 4 to the lower end. It is set in. When the recess 40 is provided in a square or rectangular shape, the recess 40 may be provided so that the shape when viewed from the front can be regarded as approximately square or rectangular. It is also possible to provide one.

For example, as shown in FIGS. 4 and 5, each of the recesses 40 provided in the body 4 is separated from the top and bottom by a partition 41 formed at the center in the height direction, compared to the examples shown in FIGS. 1 to 3. 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 4 has a ridge formed to bulge downward in the recess 40 compared to the example shown in FIGS. 1 to 3. It is also possible to provide the portion 42 so that the length of the long side is shortened.
4 is a perspective view schematically showing a modification of the present embodiment, FIG. 5 is a front view thereof, FIG. 6 is a perspective view schematically showing another modification of the present embodiment, and FIG. is a front view of the same. The BB end view in FIG. 5 and the CC end view in FIG. 7 each appear the same as FIG. 3, so they are also used as FIG.

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 tilted from each edge toward the bottom. It is preferable to provide them bilaterally symmetrically so as to invaginate 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 defined as 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 the opposite ends of the recess 40 in the width direction and the central axis C in the cross section (Fig. 3 ) can be set to be 20 to 70°, preferably 35 to 70°.
Note that in the illustrated example, the central angle θ ₁ is 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.
Note that in the illustrated example, the ratio d/w is 0.203.

The container 1 is usually attached by covering the container 1 with a heat-shrinkable film material with a desired print in a cylindrical shape and heating it so that it shrinks so as to come into close contact with the circumferential surface of the container 1. A so-called shrink label L is attached. When attaching such a shrink label L to the container 1, the shrink label L is stretched between the edges of the recess 40 in the region where the recess 40 is provided, and does not come into close contact with the container 1, but is attached to the recess 40. It is attached so that a gap is formed between the two (see FIG. 1).

Therefore, according to this embodiment, in the above-described application, when hot water is poured into the container 1, the shrink label L is heat conduction can be suppressed. Therefore, if you grip the container 1 by placing your fingers on the part stretched between the edges of the recess 40 of the shrink label L attached to the container 1, the container 1 will be too hot to grip. Problems can be effectively avoided.

In FIG. 1, the shrink label L is shown by a chain line, and the shrink label L is attached to the range from the upper end of the shoulder 3 to the lower end of the body 3. is not limited to this. It is only necessary that the shrink label L is attached to an area including the recess 40 and that heat conduction to the portion of the shrink label L stretched between the edges of the recess 40 can be suppressed.

Further, the portion stretched between the edges of the recessed portion 40 of the shrink label L may be printed to serve as a mark. By doing this, when gripping the container 1, the user is reminded to place his or her fingers on the part stretched between the edges of the recess 40 of the shrink label L, so that the container 1 is too hot. This is preferable because it is possible to more effectively avoid problems such as not being able to grip the device.

Considering moldability, etc., it is preferable to round the corners of the recess 40, but if the R of the corner becomes large, the portion stretched between the edges of the recess 40 of the shrink label L, that is, the shrink This reduces the area of the portion of the label L where heat conduction is suppressed. For this reason, it is preferable that the corner portions of the recessed portion 40 be angular to the extent that they do not interfere with molding.

Further, the edges of the recess 40 may be curved inward or outward to the extent that the area of the portion of the shrink label L stretched between the edges of the recess 40 is not significantly reduced. When both ends 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 ends 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 part stretched between the edges of the recess 40 of the shrink label L, the recess 40 is preferably provided in a square or rectangular shape. If it can be ensured, it may be provided in a circular, elliptical, or polygonal shape.

In order to suppress heat conduction to the shrink label L, the volume of the air in the gap formed between the shrink label L and the recess 40, especially the volume along the cross section, is adjusted to a certain level or more in the recess. It is necessary to provide 40. From this viewpoint, the central angle θ ₁ of the recess 40 with respect to the width w and the ratio d/w of the depth d at the center in the width direction with respect to the width w of the recess 40 are determined. If these are less than the above ranges, it will not be possible to secure a sufficient gap between the shrink label L and the recess 40 to provide a sufficient heat insulating effect, making it difficult to suppress heat conduction to the shrink label L.

Further, for example, when the body 4 is formed into a generally cylindrical shape or a rectangular tube shape similar to a cylinder, the larger the central angle θ ₁ with respect to the width w of the recess 40 is, the more the tension between the edges of the recess 40 increases. The position of the shrink label L is 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 that is sufficient to provide sufficient heat insulation. Put it away.

Moreover, if the central angle θ ₁ with respect to the width w of the recess 40 becomes large, it becomes difficult to secure a sufficient lateral stretching ratio, and uneven thickness of the body 4 tends to occur, or the formability of the body 4 becomes poor. There is also the possibility that a problem may occur where the

In addition, 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 formed to be deep, the moldability, mold opening after molding, and mold release properties will be reduced. This is disadvantageous in terms of improving the quality of the container, and it is also disadvantageous in ensuring the capacity of the container 1.

In providing a plurality of recesses 40 in the body 4 along the circumferential direction, the center angle θ ₂ with respect to the interval between the recesses 40 adjacent in the circumferential direction, that is, in the cross section, one of the recesses 40 adjacent in the circumferential direction The recess 40 is formed so that the angle θ ₂ (see FIG. 3) between the width direction edge of the other recess 40 and the line connecting the width direction edge of the other recess 40 and the center axis C is 10 to 45 degrees. It is preferable to arrange it.
In the illustrated example, the central angle θ ₂ is 45°.

If the central angle θ ₂ is less than the above range, problems such as insufficient strength of the region between the recesses 40 and deterioration of shapeability of the body 4 may occur. There is a possibility that this may occur. On the other hand, if the central angle θ ₂ exceeds the above range, there is a possibility that the width w of the recess 40 may not be sufficiently long.

In contrast to the examples shown in FIGS. 1 to 3, examples in which the center angle θ ₂ with respect to the interval between circumferentially adjacent recesses 40 is made smaller and the width w of the recesses 40 are increased accordingly are shown in FIGS. 8 to 10. show.

FIG. 8 is a perspective view schematically showing another modification of the present embodiment, and FIG. 9 is a front view thereof. FIG. 10 is a DD end view of FIG. 9, and in FIG. 10, the wall thickness appearing on the end surface 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 with respect to the width w of the recess 40 is 0.141. In contrast to the examples shown in FIGS. 1 to 3, a rectangular recess 40 is provided with a longer width w while keeping the length in the height direction the same. The four recesses 40 thus provided are arranged along the circumferential direction so that the center angle θ ₂ with respect to the interval between the circumferentially adjacent recesses 40 is 22°.

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

In this embodiment, the container 1 is narrowed at a portion near the upper end of the body 4 and extends along the height direction from the upper end of the shoulder 3 to the lower end of the body 4. The container is formed into a generally cylindrical container shape, with troughs 43 provided at predetermined intervals along the circumferential direction, and ridges 44 formed between adjacent troughs 43 in the circumferential direction. 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.

In this embodiment, a plurality of square or rectangular recesses recessed inside the container are arranged corresponding to each of the troughs 43 in the constricted area on the upper end side of the body 4. 40 are 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 is 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 is 0.184. A rectangular recess 40 whose short side is in the width direction is provided. Then, the eight recesses 40 provided in this manner are arranged in valleys at the narrowed part of the upper end of the body 4 so that the center angle θ ₂ with respect to the interval between circumferentially adjacent recesses 40 is 11°. 43, respectively.
In this embodiment, the length of the recess 40 in the height direction can be approximately the length of one finger, taking into consideration the size of a typical person's fingers.

In addition, in this embodiment, by increasing or decreasing the number of troughs 43 and ridges 44 arranged alternately along the circumferential direction and adjusting the width of the troughs 43, the width of the recess 40 is adjusted accordingly. w can be adjusted.

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

FIG. 15 is a perspective view schematically showing a modification of the present embodiment, FIG. 16 is a front view thereof, and FIG. 17 is a plan view thereof. FIG. 18 is an FF end view of FIG. 16, and in FIG. 18, the wall thickness appearing on the end surface 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. In the examples shown in FIGS. 11 to 14, a rectangular recess 40 is provided with a shorter width w while keeping the length in the height direction the same. Then, the nine recesses 40 provided in this manner are arranged in valleys at the narrowed portion of the upper end of the body 4 such that the center angle θ ₂ with respect to the interval between circumferentially adjacent recesses 40 is 20°. 43, respectively.

In addition, in this embodiment, for example, as shown in FIGS. 19 to 22, the interval between the circumferentially adjacent ridges 44 is changed so that the width of the trough 43 is changed every other time along the circumferential direction. It is also possible to widen the recessed portions 40 and arrange the recessed portions 40 corresponding to each of the widened valley portions 43. By doing so, the width w of the recess 40 can be increased in accordance with the width of the widened trough 43.

FIG. 19 is a perspective view schematically showing another modification of the present embodiment, FIG. 20 is a front view thereof, and FIG. 21 is a plan view thereof. FIG. 22 is a GG end view of FIG. 20, and in FIG. 22, the wall thickness appearing on the end surface 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. In the examples shown in FIGS. 11 to 14, a rectangular recess 40 is provided with a longer width w while keeping the length in the height direction the same. The width of the four concave portions 40 provided in this manner at the narrow portion on the upper end side of the body portion 4 is such that the center angle θ ₂ with respect to the interval between circumferentially adjacent concave portions 40 is 44°. They are arranged corresponding to each of the widened troughs 43.

As described above, this embodiment differs from the first embodiment described above in the above points, but the other configurations are the same as the first embodiment described above, and therefore, redundant explanation will be omitted.

Hereinafter, the present invention will be explained in more detail by giving specific examples.

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

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

*Evaluation: Based on the relationship between the temperature at which low-temperature burns occur and the contact time, the shrink label L whose surface temperature is less than 53°C at the part stretched between the edges of the recess 40 is rated "◎". , those with a temperature of 53°C or more and less than 55°C were marked as “○”, those with a temperature of 55°C or more and less than 60°C were marked as “△”, and those with a temperature of 60°C or more were marked as “×”.

[Example 2]
The surface temperature of the shrink label L at parts a to c shown in FIG. 23 was measured in the same manner as in Example 1, except that the container 1 was manufactured 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 parts a to c shown in FIG. 23 was measured in the same manner as in Example 1, except that the container 1 was manufactured 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 parts a to c shown in FIG. 23 was measured in the same manner as in Example 1, except that the container 1 was manufactured 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 parts a to c shown in FIG. 23 was measured in the same manner as in Example 1, except that the container 1 was manufactured 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 parts a to c shown in FIG. 23 was measured in the same manner as in Example 1, except that the container 1 was manufactured 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 parts a to c shown in FIG. 23 was measured in the same manner as in Example 1, except that the container 1 was manufactured to have the container shape shown in FIGS. 19 to 22. The results are also shown in Table 1.

[Comparative example 1]
In contrast to Example 5, twelve troughs 43 and twelve ridges 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 rectangular shape has a shorter width w while keeping the length in the height direction the same as in Example 4. The twelve recesses 40 are arranged to correspond to each of the troughs 43 in the constricted portion of the upper end of the body 4 so that the center angle θ ₂ with respect to the interval between circumferentially adjacent recesses 40 is 15°. The surface temperature of the shrink label L at portions a to c shown in FIG. 23 was measured in the same manner as in Example 5, except that the shrink label L was placed in the same manner as in Example 5. The results are also shown in Table 1.

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

For example, the uses of the synthetic resin container according to the present invention are not limited to the above-mentioned uses. It can also be used for so-called heated sales, where the liquid content is heated and sold using a warming machine such as a hot warmer installed at a store.
Further, the capacity of the synthetic resin container according to the present invention is not particularly limited, but it can be particularly suitably applied to containers 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 center angle θ ₁ of 20 to 70° with respect to the width w of the recess 40, and a center angle θ1 in the width direction with respect to the width w of the recess 40. As long as the ratio d/w of the depth d is set to 0.07 to 0.4, other details of the configuration are not limited to the above-described embodiment and can be changed as appropriate. The surface of the container 1 may be decorated by, for example, processing the cavity surface of a blow molding die into a knurling or mesh pattern, and then transferring the pattern. This can be expected to further reduce the surface temperature of the attached shrink label.

1 Container 2 Mouth 3 Shoulder 4 Body 5 Bottom 40 Recess w Width of recess d Depth of center of recess in width direction L Shrink label

Claims (5)

A synthetic resin container comprising a mouth, a shoulder, a body, and a bottom,
A plurality of recesses are provided in the body portion along the circumferential direction, the center portion of which is the deepest in the container in the width direction,
The central angle with respect to the width of the recess is 20 to 70°,
The ratio of the depth at the center in the width direction to the width of the recess is 0.07 to 0.4,
A shrink label attached to an area including the recess is stretched between edges of the recess, and air in a gap formed between the shrink label and the recess exhibits a heat insulating effect. A container made of synthetic resin. The synthetic resin container according to claim 1, wherein the central angle of the recess with respect to the width 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 recessed portion has a square or rectangular outline. The synthetic resin container according to any one of claims 1 to 4, wherein the central angle with respect to the interval between the circumferentially adjacent recesses is 10 to 45°.

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