JP5138502B2 - Synthetic resin containers capable of compressive deformation - Google Patents

Description

  The present invention comprises a body part and a bottom part connected to the body part via a heel part, and is integrally formed, and compressing deformation that absorbs deformation caused by a decrease in internal pressure by compressing part of itself. This relates to a container made of synthetic resin.

As a synthetic resin container capable of compressive deformation, for example, a mouth tube portion, a straight neck tube portion connected through a neck ring provided on the mouth tube portion, and a diameter integrally expanding from the neck tube portion A shoulder part, a body part connected to the shoulder part, and a bottom part connected to the body part via a heel part are integrally formed, and a part of the body part is recessed radially inward along the axis. In addition, by forming an annular recess that divides this body part into an upper part and a lower part, the upper surface of the annular recess connected to the upper part can be folded toward the lower surface of the annular recess connected to the lower part. There is a heat-filled bottle that absorbs deformation caused by the decompression effect after cooling (for example, see Patent Document 1).
Special table 2004-507405 gazette

  However, in fact, such a synthetic resin container may be deformed in a state in which the upper portion of the body portion is inclined with respect to the axis without the upper surface of the annular recess being uniformly folded toward the lower surface. Since such deformation is recognized as an appearance defect, the present inventors have come to recognize that there is room for further improvement.

  The problem to be solved by the present invention is to provide a synthetic resin container excellent in aesthetic appearance that can be folded evenly around its axis.

The present invention comprises a body part and a bottom part connected to the body part via a heel part, integrally formed,
The body portion is expanded radially outward from the lower portion, and the upper portion and the lower portion become a large diameter portion and a small diameter portion, respectively.
A portion of the large diameter portion is recessed radially inward along the axis to form a first annular recess,
Forming a second annular recess by indenting a part of the small diameter portion radially inward along the axis so as to contact the large diameter portion;
Furthermore, the maximum depth from the large diameter portion in the second annular recess is deeper than the maximum depth from the large diameter portion in the first annular recess, and the first annular recess and the second annular recess are Compressive deformation characterized in that the upper surface of the second annular recess connected to the large-diameter portion can be folded toward the lower surface of the second annular recess connected to the small-diameter portion. It is a possible synthetic resin container.

  Examples of the first annular recess include one in which the innermost diameter portion forms an annular flat surface, and the flat surface is connected to the upper portion and the lower portion of the large diameter portion divided by the first annular recess. In this case, between the upper portion and the innermost diameter portion, an annular shape that extends while being inclined radially outward toward the upper portion, or an annular shape that extends in parallel radially outward toward the upper portion. You may connect with a flat surface or the cyclic | annular curved surface swelled inside or outside a recessed part. Further, between the lower portion and the innermost diameter portion, it extends while inclining radially outward toward the lower portion, or extends in parallel radially outward toward the lower portion. It may be connected by an annular flat surface or an annular curved surface bulged inside or outside the recess.

  Further, the first annular recess may be configured as an annular curved surface connecting the upper and lower portions of the large-diameter portion divided by the first annular recess, and the inflection point may be the innermost diameter portion. . That is, as the first annular recess, one having various cross-sectional shapes can be adopted as long as it has a shape capable of exhibiting high strength against buckling (high rigidity that hardly causes deformation).

  On the other hand, if the annular upper surface connected to the large diameter portion can be folded toward the annular lower surface connected to the small diameter portion, the innermost diameter portion of the second annular recess is an annular curved surface. Or an annular flat surface.

  Further, the upper surface of the second annular recess may be configured so as not to easily deform when folded toward the lower surface. For example, the space between the large diameter portion and the innermost diameter portion bulges inside or outside the recess. Examples thereof include an annular curved surface, a flat surface extending in parallel radially outward toward the large diameter portion, or extending while inclining radially outward. In addition to this, the portion of the large-diameter portion that is in contact with the second annular recess also has a curved surface that bulges inward or outward of the recess, and is parallel to the radially outward toward the large-diameter portion. You may comprise as a flat surface etc. which extend or incline in radial direction outward.

  The lower surface of the second annular recess may be configured so as not to be deformed when the upper surface is folded. For example, the space between the small diameter portion and the innermost diameter portion is parallel to the outer diameter in the radial direction. Or an annular flat surface extending while inclining radially outward, an annular curved surface bulging inside or outside the recess, and the like. In addition, the portion where the small diameter portion is in contact with the lower surface of the second annular recess may also be configured as a curved surface that bulges inside the recess.

  Furthermore, the 2nd annular recessed part should just be formed in the small diameter part so that the lower end of a large diameter part may be contact | connected. In this case, the upper surface of the second annular recess may be connected to the large diameter portion so that the outermost diameter is equal to the outer diameter of the small diameter portion. The outermost diameter dimension may be equal to the outermost diameter dimension of the small diameter part, or may be shorter than the outermost diameter dimension of the small diameter part.

  That is, as the second annular concave portion, various cross-sectional shapes can be used as long as the annular upper surface connected to the large-diameter portion is easily folded toward the annular lower surface connected to the small-diameter portion (a shape that is unlikely to be deformed). Can be adopted.

  In addition, the maximum depth from the large-diameter portion in the second annular recess is deeper than the maximum depth from the large-diameter portion in the first annular recess, and the first annular recess and the second annular recess are Or less in the axial dimension between Thereby, the second annular recess becomes easier to fold the annular upper surface toward the annular lower surface.

  In the present invention, it is preferable that the maximum depth from the large-diameter portion in the first annular recess is not more than half of the maximum depth from the large-diameter portion in the second annular recess.

  In the present invention, by expanding the upper portion of the body portion radially outward from the lower portion, the upper portion and the lower portion become a large diameter portion and a small diameter portion, respectively. A first annular recess is formed by recessing the portion radially inward along the axis, and a part of the small diameter portion is recessed radially inward along the axis so as to contact the large diameter portion. The second annular recess, and the maximum depth from the large diameter portion of the second annular recess is deeper than the maximum depth from the large diameter portion of the first annular recess, and the first The upper surface of the second annular recess connected to the large-diameter portion is folded toward the lower surface of the second annular recess connected to the small-diameter portion by making the axial dimension between the annular recess and the second annular recess equal to or less than By making it possible, the upper surface of the second annular recess faces the lower surface over the entire circumference. Easy folding made. Therefore, the container can be easily compressed and deformed in the axial direction by reducing the internal pressure of the container or by applying an external force to the container in the axial direction.

  Moreover, according to the present invention, the folded state can be maintained even after the upper surface of the second annular recess is folded toward the lower surface. Since the folded state does not relate to whether or not the container is in a decompressed state, the contents can be filled in a state in which the container is folded and compressed in advance.

  Therefore, the synthetic resin container of the present invention has a beautiful aesthetic appearance because the container body is evenly folded in the axial direction and the folded state is maintained even when the internal pressure of the container decreases. Can be provided to the market and the like.

  The reason why the second annular recess is easily folded is that the first annular recess formed on the upper side of the second annular recess has high rigidity, so that the first annular recess does not buckle. This is probably because the second annular recess is easily bent inward in the radial direction by the large diameter portion spreading outward in the radial direction. On the other hand, the reason why the folded state in the second annular recess is maintained is that if the large-diameter portion spreads outward in the radial direction and the second annular recess is bent once, the first rigid first The annular recess is considered to prevent the restoration.

  For this reason, in the present invention, if the maximum depth of the first annular recess is less than or equal to half of the maximum depth from the large-diameter portion of the second annular recess, the rigidity of the first annular recess is effectively increased. As a result, the folding at the second annular recess becomes easier, and the folded state can be maintained more firmly.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 and FIG. 2 are a front view showing a state before filling a heat filling bottle (hereinafter referred to as “bottle”) 10 according to the present invention, and a front view showing a reduced pressure absorption state of the bottle 10. 3 is an enlarged view of a main part of the region X shown in FIG. 1, and FIG. 4 is a cross-sectional view taken along the line AA in FIG.

  The bottle 10 includes a mouth tube portion 11, a straight neck tube portion 12 connected via a neck ring 11 a provided in the mouth tube portion 11, a shoulder portion 13 that expands integrally from the neck tube portion 12, A biaxially stretched blow-molded bottle comprising polyethylene terephthalate (PET) as a main component, which is integrally formed with a body portion 14 connected to the shoulder portion 13 and a bottom portion 16 connected to the body portion 14 via a heel portion 15. It is.

The barrel 14, by expanding the upper portion 14a of the body 14 radially outwardly from the lower portion 14b, a large diameter portion 14a made as a cylindrical portion with a diameter of phi _14a, than the large diameter portion 14a the small diameter portion 14b is formed comprising a cylindrical portion of smaller diameter of the diameter phi _14b.

  A part of the large-diameter portion 14 a is recessed inward in the radial direction along the axis O to form a first annular recess (hereinafter referred to as “first annular recess”) 1.

As shown in FIG. 3, the first annular recess 1 has an innermost diameter portion 1 a forming an annular flat surface, and the innermost diameter portion 1 a is an upper portion of a large diameter portion divided by the first annular recess 1 ( Hereinafter, the “large diameter upper portion”) 14a ₁ and the lower portion (hereinafter “large diameter lower portion”) 14a ₂ are connected.

In this case, the annular connecting portion 1b connecting between the large-diameter upper portion 14a ₁ and the innermost diameter portion 1a, as shown in FIG. 3, becomes a curved face of the annular bulging towards the outside of the bottle 10 , the flat surfaces of the extending annular circular curved surface or composed by bulging inward, while inclined toward the large diameter upper portion 14a ₁ in the radially outward of the bottle 10, or larger diameter upper portion 14a may be a flat surface of the annular extending parallel radially outwardly towards _1.

Further, an annular connecting portion 1c connecting between the large径下side portion 14a ₂ and the innermost diameter portion 1a is also shown in FIG. 3, it becomes a curved face of the annular bulging towards the outside of the bottle 10 , the flat surfaces of the extending annular circular curved surface or composed by bulging inward, while inclined toward the large径下portion 14a ₂ radially outward of the bottle 10, or a large径下it may be annular flat surface which extends parallel to the radially outward toward the side portions 14a _2.

Further, the first annular recess 1 is configured as an annular curved surface connecting the large-diameter upper portion 14a ₁ and the large-diameter lower portion 14a ₂ divided by the first annular recess 1, and the inflection point is the innermost diameter. It may be a part. That is, as the first annular recess 1, those having various cross-sectional shapes can be adopted as long as the shape can exhibit high strength against buckling (high rigidity that hardly causes deformation).

In contrast, reference numeral 2, a second annular recess (hereinafter which is formed by recessing radially inwardly along around the axis O of the part of the small-diameter portion 14b so as to be in contact with a large径下portion 14a ₂ , Referred to as “second annular recess”.

The second annular recess 2 includes an annular upper surface (hereinafter referred to as “second annular recess upper surface”) 2a connected to the large-diameter lower portion 14a ₂ and an annular lower surface (hereinafter referred to as “second annular recess”) connected to the small-diameter portion 14b. 2b), and the two are connected by an innermost diameter portion 2c that is an annular curved surface. According to the present invention, the innermost diameter portion 2c may be an annular flat surface as long as the second annular recess upper surface 2a can be folded toward the second annular recess lower surface 2b.

Further, the upper surface of the second annular recess 2a may be configured so as not to be easily deformed when folded toward the lower surface of the second annular recess 2b. In this embodiment, as shown in FIG. 14 a ₂ and the innermost diameter portion 2 c are connected as an annular curved surface formed by bulging toward the outside of the bottle 10 with a radius of curvature r ₁ . However, this according to the invention, the curved surface and the annular made by bulging towards the inside of the bottle 10 as the second annular recess upper surface 2a, parallel to the radially outward toward the larger径下portion 14a ₂ A flat surface or the like that extends or tilts radially outward can also be employed.

In addition, in this embodiment, the portion 14a ₂ (e) in contact with the second annular recess upper surface 2a in the large-diameter lower portion 14a _{2 also} swells toward the outside of the bottle 10 with the curvature radius r _2. An annular curved surface is formed. However, according to the present invention, the portion 14a ₂ (e) in contact with the second annular recess 2 has an annular curved surface bulged toward the inside of the bottle 10 with a radius of curvature r ₂ It extends parallel to the radially outward toward the portion 14a _2, or may be configured as a flat surface or the like extending with inclined radially outwardly.

  The second annular recess lower surface 2b may be configured so as not to easily deform when the second annular recess upper surface 2a is folded. In this embodiment, as shown in FIG. The portion 2c is connected as an annular flat surface extending while inclining radially outward toward the small diameter portion 14b. However, according to the present invention, as the second annular recess lower surface 2b, an annular flat surface extending in parallel radially outward toward the small-diameter portion 14b, or bulging outward or inward of the bottle 10. It is also possible to adopt an annular curved surface.

  In addition, in this embodiment, as shown in FIG. 3, a portion 14 b (e) where the small-diameter portion 14 b contacts the second annular recess lower surface 2 b is also bulged toward the outside of the bottle 10. It is configured as a surface.

Furthermore, the 2nd annular recessed part 2 should just be formed in the small diameter part 14b so that the large diameter part 14 may be contact | connected. In this case, the second annular recess upper surface 2a, the outermost diameter phi _2a may be connected to the large-diameter portion so as to be equal to the outside diameter phi _14b of the small diameter portion 14b, but in this embodiment, The second annular recess upper surface 2a has its outermost diameter dimension φ _2a longer than the outermost diameter dimension φ _{2b of} the second annular recess lower surface 2b, thereby outwardly in the radial direction with respect to the second annular recess lower surface 2b. The shift ΔC ₁ is generated, and the outermost diameter φ _2a is made shorter than the outer diameter φ _14b of the small diameter portion 14b, thereby generating a shift ΔC ₂ inward in the radial direction with respect to the small diameter portion 14b. I am letting.

That is, as the second annular recess 2, easily shaped folding the second annular recess upper surface 2a leading to a large径下portion 14a ₂ is toward the second annular recess lower surface 2b connected to the small diameter portion 14b (is less susceptible shape deformation) If so, various cross-sectional shapes can be employed.

In addition, in this embodiment, the maximum depth D ₂ from the large diameter portion 14 in the second annular recess 2 is set deeper than the maximum depth D ₁ from the large diameter portion 14 in the first annular recess 1 ( D _2> D _1). The maximum depth D ₂ is set to be not more than the axial dimension L _B between the first annular recess 1 and the second annular recess 2 (D ₂ ≦ L _B ). As a result, the upper surface 2a of the second annular recess is further easily folded toward the lower surface 2b of the second annular recess.

In the present invention, the upper portion and the lower portion of the body portion 14 are respectively formed as a large diameter portion 14a and a small diameter portion 14b, and a part of the large diameter portion 14a is recessed radially inward along the axis O. In addition to forming the first annular recess 1, a part of the small diameter portion 14 b is recessed radially inward along the axis O so as to contact the large diameter portion 14, thereby forming the second annular recess 2. Furthermore, the maximum depth D ₂ from the large-diameter portion 14 in the second annular recess 2 is deeper than the maximum depth D ₁ from the large-diameter portion 14 in the first annular recess 1, and the first annular recess 1. Since the second annular recess upper surface 2a can be folded toward the second annular recess lower surface 2b by making the axial dimension L or less between the second annular recess 2 and the second annular recess upper surface 2a, It becomes easy to fold toward the second annular recess lower surface 2b over the entire circumference. Therefore, the bottle 10 can be easily compressed and deformed in the axis O direction by reducing the internal pressure of the bottle 10 or by applying an external force to the bottle 10 in the direction of the axis O. it can.

  Moreover, according to the present invention, the folded state can be maintained even after the second annular recess upper surface 2a is folded toward the second annular recess lower surface 2b. Since the folded state does not relate to whether or not the bottle 10 is in a decompressed state, it is possible to fill the contents with the bottle 10 folded and compressed in advance.

  Therefore, the bottle 10 according to the present invention has a beautiful aesthetic appearance because the body 14 is evenly folded in the direction of the axis O and the folded state is maintained even when the internal pressure of the bottle 10 decreases. Can be provided to the market and the like.

The reason why the second annular recess 2 is easily folded is that the first annular recess 1 formed on the upper side of the second annular recess 2 has high rigidity, and the first annular recess 1 is bent without buckling. By functioning as a possible rib A, the large-diameter lower portion 14a ₂ expands radially outward as a non-deformable rib B, so that the second annular recess 2 is easily bent inward in the radial direction. It is thought to function. On the other hand, the reason why the folded state in the second annular recess 2 is maintained is that the large-diameter lower portion 14a ₂ as the rib B spreads radially outward and the second annular recess 2 as the rib C is 1 It is considered that the first annular recess 1 as the highly rigid rib A prevents the restoration when it is bent once.

For this reason, in the present invention, the maximum depth D ₁ from the large diameter portion 14 in the first annular recess 1 is equal to or less than half of the maximum depth D ₂ from the large diameter portion 14 in the second annular recess 2 (D ₁ ≦ if the D _2/2), since effectively increased the first rigid annular recess 1, that is folded in the second annular recess 2 further with easier, also more firmly maintain its folded state it can.

In this embodiment, the axial dimension of the first annular recess 1 is set shorter than the axial dimension of the second annular recess 2. Further, the axial dimensions L _1a , L _1b and L _1c of the innermost diameter portion 1a and the connecting portions 1b and 1c of the first annular recess 1 are in a 2: 1: 1 relationship, and the second annular recess 2 The axial dimensions L _2a , L _2b, and L _2c of the upper surface 2a, the lower surface 2b, and the innermost diameter portion 2c are in a 1: 1: 1 relationship. Further, the radii of curvature r ₁ , r _2, and r ₃ are in a relationship of r ₁ > r ₃ = r ₂ , respectively.

  The above description is to explain preferred embodiments of the present invention, but various modifications can be made within the scope of the claims. For example, the bottle 10 is a cylindrical bottle, but can also be adopted as a prismatic bottle or the like. Moreover, although this invention is mainly employ | adopted as what has a hot filling bottle as a main body, it is not limited to this.

  The synthetic resin container according to the present invention is mainly applied to a container for heating and filling contents such as beverages, but under the condition that the external shape of the container is deformed by reducing the internal pressure of the container. If it is used, it is not restricted to this.

It is a front view which shows the state before filling of the bottle for heat filling according to this invention. It is a front view which shows the decompression absorption state of the bottle. It is a principal part enlarged view of the area | region X shown in FIG. It is AA sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st cyclic | annular recessed part 1a The innermost diameter part 1b of the 1st annular recessed part 1b The cyclic | annular connection part which connects between a large diameter upper part and an innermost diameter part 1c The cyclic | annular connection which connects between a large diameter lower side part and an innermost diameter part Part 2 Second annular recess 2a Upper surface of second annular recess (upper surface of second annular recess connected to lower-diameter portion)
2b Lower surface of second annular recess (lower surface of second annular recess connected to small diameter portion)
2c Innermost diameter portion of second annular recess 10 Heat filling bottle (synthetic resin container)
11 neck portion 11a neck ring 12 neck portion 13 shoulder portion 14 trunk portion 14a trunk upper portion (large diameter portion)
14a ₁ Large diameter upper part (upper part of large diameter part)
14a ₂ Large diameter lower part (lower part of large diameter part)
14a ₂ (e) Of the large-diameter lower part, the part in contact with the second annular recess 2 14b The trunk lower part (small-diameter part)
14b (e) A portion where the small diameter portion is in contact with the lower surface of the second annular recess 15 Heel portion 16 Bottom A Rib (first annular recess)
B rib (large diameter lower part)
C rib (second annular recess)
D ₁ Maximum depth of the first annular recess D ₂ Maximum depth from the large-diameter portion in the second annular recess L _B Axial dimension between the first annular recess and the second annular recess r ₁ Upper surface of the second annular recess of the curvature radius r ₂ major径下portion of the curvature of the portion a radius of curvature r ₃ small-diameter portion of the portion in contact with the second annular recess upper surface in contact with the second annular recess lower surface radius

Claims (2)

A body part and a bottom part connected to this body part via a heel part are integrally formed,
The body portion is expanded radially outward from the lower portion, and the upper portion and the lower portion become a large diameter portion and a small diameter portion, respectively.
A portion of the large diameter portion is recessed radially inward along the axis to form a first annular recess,
Forming a second annular recess by indenting a part of the small diameter portion radially inward along the axis so as to contact the large diameter portion;
Furthermore, the maximum depth from the large diameter portion in the second annular recess is deeper than the maximum depth from the large diameter portion in the first annular recess, and the first annular recess and the second annular recess are Compressive deformation characterized in that the upper surface of the second annular recess connected to the large-diameter portion can be folded toward the lower surface of the second annular recess connected to the small-diameter portion. Possible synthetic resin container.   In Claim 1, the maximum depth from the large-diameter portion in the first annular recess is less than or equal to half the maximum depth from the large-diameter portion in the second annular recess. Synthetic resin container.

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