JP4813285B2 - Plastic bottle - Google Patents

Description

  The present invention relates to a synthetic resin bottle having a body part that is connected from a mouth part via a shoulder part, and a recessed part that is recessed toward the inside of the bottle. Improve the rigidity of bottles.

  In recent years, synthetic resin bottles (hereinafter referred to as “bottles”) have become widespread as filling containers for beverages, cosmetics, drugs, and the like from the viewpoint of moldability and convenience. Among such bottles, in particular, those having a relatively large capacity of 1 liter or more may be formed with a concave portion that is recessed toward the inside of the container in order to facilitate gripping with one hand. It is known (for example, refer to Patent Document 1).

  Moreover, it is common to wind the label which gave the brand name, the decoration, etc. around the trunk | drum on the bottle. In particular, a shrink label made of a heat-shrinkable film is frequently used because it is possible to attach a label at a final product manufacturing factory. However, the shrink label does not necessarily shrink uniformly due to a difference in the contact state with the body portion, etc., so that there is a problem that the label is wrinkled and the aesthetic appearance of the final product is impaired. In order to prevent such wrinkles, for example, in Patent Document 2, a circumferential groove is provided in the body portion, and the boundary ridge line between the side surface of the body portion and the circumferential groove is surrounded by the center portion in the width direction rather than the end portion in the width direction. It has been proposed that the shape protrudes toward the groove and the shrink label is hooked on this boundary ridgeline.

JP 2004-250063 A JP-A-8-230857

  From the viewpoint of handling of the bottle, it is preferable to provide a recess and increase its size as much as possible. However, since the recess of the prior art can cause a decrease in the rigidity of the bottle, its size is naturally limited. was there. In particular, in recent years, bottles have been reduced in weight due to resource saving, and the bottles tend to be thinner, so this problem has become more prominent.

  Moreover, the bottle provided with the conventional recessed part does not consider even the beauty | look of the label in a final product.

  An object of the present invention is to provide a bottle in which the rigidity of the concave portion is improved.

  In order to achieve the above-mentioned object, the present invention has a body part connected from a mouth part through a shoulder part, and a synthetic resin bottle formed by forming a recessed part recessed toward the inside of the bottle in the body part. In this case, at least one of the mouth-side ridge line and the bottom-side ridge line of the concave portion is a synthetic resin bottle characterized in that a center portion in the width direction has a plan view shape protruding toward the other ridge line. . In this way, by causing the ridge line of the recess to protrude toward the center of the recess, deformation due to the pressing force can be suppressed.

  Moreover, it is preferable that the mouth part side ridgeline and the bottom part side ridgeline of the said recessed part are substantially parallel. Furthermore, it is preferable to form a pair of said recessed part in the side wall which a trunk | drum opposes, and to form the horizontal groove extended along the circumferential direction between these recessed parts. In this case, it is more preferable that the boundary ridge line between the lateral groove and the side wall adjacent to the ridge line from which the concave portion protrudes has a plan view shape in which the central portion in the width direction protrudes toward the concave portion.

  According to this invention, the concave portion is formed in a substantially U shape or V shape, a space for allowing the fingertip to enter can be secured, and good gripping performance can be exhibited. Moreover, when a recessed part is arrange | positioned at a horizontal groove, the depth becomes large and it can improve gripping performance more. Furthermore, it is possible to suppress deformation due to the pressing force generated when the concave portion is gripped.

  In addition, according to another aspect of the present invention, by optimizing the shape of the boundary ridge line between the lateral groove and the side wall, even if the central portion in the width direction of the label having a weak contact pressure with the body portion is about to contract vertically As a result of the label being caught on the boundary ridgeline and exhibiting resistance to shrinkage, the aesthetic appearance of the label in the final product can be maintained.

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

  FIG. 1 (a) is a front view of a representative bottle according to the present invention, FIG. 1 (b) is a bottom view of the bottle, and FIG. 2 is on the AA line of FIG. 1 (a). The cross section is shown and FIG. 3 has expanded and shown the principal part of the bottle 10 shown to Fig.1 (a). A bottle 10 shown in FIGS. 1A and 1B includes a mouth portion 11 for pouring contents, a shoulder portion 12 having a substantially trapezoidal shape in plan view extending downward from the mouth portion 11, and the shoulder portion 12. It has the trunk | drum 13 connected below. The trunk | drum 13 has the bottom part 14 in the lower end, and makes it possible to fill the inside of the bottle 10 with the content. As is apparent from FIG. 1B, the body portion 13 has a substantially square cross section formed by integrally connecting two pairs of opposing side walls with four corner wall surfaces. Further, as shown in FIG. 2, a concave portion 15 is formed on the side wall of the body portion 13 so as to be recessed toward the inside of the bottle 10 and to improve the gripping property that is lower than the side wall of the body portion 13. . Such a bottle can be obtained, for example, by biaxial stretch blow molding a preform (not shown) made of PET (polyethylene terephthalate).

  The main feature of the present invention is that at least one of the mouth-side ridge line 16 and the bottom-side ridge line 17 (the ridge line 16 on the mouth 11 side in FIG. 3) is the other in the center in the width direction. Projecting toward the ridge line (the ridge line 17 on the bottom 14 side in FIG. 3) and having a plan view shape that is substantially V-shaped or substantially U-shaped.

  In a bottle having a conventional recess, the ridge line of the recess is often formed in a straight line. When the pressing force is applied to the recess and the bottle is deformed inward, the connection between the recess and the side wall of the body 13 is performed. In the vicinity of the part, the side wall of the body portion is likely to be broken, and the lowering of the rigidity around the recess has been a problem. On the other hand, in the bottle 10 of this invention, the bending deformation at the time of gripping the bottle can be suppressed by adopting the concave portion 15 having the ridgeline having the shape in plan view.

  Either the mouth side ridge line 16 or the bottom side ridge line 17 of the concave portion 15 may be projected in a plan view. However, when the bottle is gripped and lifted, a large force is applied to the mouth side ridge line 16 to cause deformation. Since it is easy, it is preferable to set it as the planar view shape which protruded the mouth part side ridgeline 16. FIG. When the recess 15 is required to have particularly high rigidity, it is preferable to have a plan view shape in which both the mouth side ridge line 16 and the bottom side ridge line 17 protrude.

  Moreover, it is preferable that the mouth part side ridgeline 16 and the bottom part side ridgeline 17 of the recessed part 15 are substantially parallel. Thereby, when a user grasps a bottle, he can put a finger easily and grip nature improves further.

  The recess 15 can be appropriately arranged according to the capacity and shape of the bottle, but considering the mass balance when the bottle 10 is gripped by the recess 15, as shown in FIG. It is preferable to arrange so as to be approximately in the center in each of the direction and the height direction. Although not shown, a plurality of recesses 15 can be provided.

  Further, in this embodiment, a lateral groove 18 that extends along the circumferential direction of the bottle through the recess 15 is provided. Such a lateral groove 18 is particularly preferable in the case of a large-capacity bottle because it can increase the circumferential rigidity of the bottle and prevent the bottle body from expanding. Further, since the lateral groove 18 is provided so as to pass through the recess 15, the user can easily put his / her finger when gripping the bottle, and the gripping property is further improved.

  Furthermore, from the viewpoint of enabling the user to easily and reliably grip the bottle regardless of the direction of the bottle, a pair of recesses 15 are formed on the opposing side walls of the body 13, and a lateral groove is formed between these recesses 15. 18 is preferably formed. The lateral groove 18 does not need to extend continuously in the circumferential direction, and is shown in FIG. 1A within a range that does not significantly impair the circumferential rigidity and gripping property in consideration of other performance such as the axial rigidity of the bottle. It may be divided as appropriate.

  As described above, it is common to wind a label around such a bottle. In such a case, the boundary ridgeline 19 between the lateral groove 18 and the side wall of the body portion 13 adjacent to the ridgeline (the mouth side ridgeline 16 in FIG. 3) protruding from the recess 15 has a center portion in the width direction of the recess 15. It is preferable that the edge of the side wall adjacent to the recess 15 protrudes toward the recess 15 in a substantially V shape or a substantially U shape. As the label, particularly, a shrink label in which a heat-shrinkable film is formed in a cylindrical shape is frequently used. This cylindrical shrink label is externally attached to the body of the bottle, heated, and the circumferential direction and By shrinking in the vertical direction, it is firmly fixed to the body. At this time, if the boundary ridge line between the lateral groove and the side wall of the body portion is linear, the shrink label is stretched between the corner wall surfaces, and therefore, the contact pressure between the shrink label and the bottle is , It becomes smaller at the center portion in the width direction than at both ends in the width direction of the side wall. This tendency becomes remarkable due to the presence of the recess 15. If heating is performed in this state, heat shrinkage deformation in the vertical direction is prevented at both ends in the width direction where the contact pressure is large, while heat shrinkage deformation in the vertical direction continues at the center part in the width direction where the contact pressure is small. The shrink label is shrunk and deformed unevenly, and wrinkles are generated, and the product name and decoration printed on the label are distorted. On the other hand, in the bottle of this embodiment, since the boundary ridge line 19 between the lateral groove 18 and the side wall is curved and protruded, when the shrink label is heated, the label is changed to the boundary ridge line 19 due to heat shrinkage deformation in the circumferential direction. In close contact. And even if the label is going to thermally shrink in the vertical direction, as shown in FIG. 4, the shrink label 20 is caught on the boundary ridge line 19 that is curved and protrudes, and exhibits resistance to shrinkage. Since the shrinkage of the shrink label with respect to the boundary ridge line 19 becomes larger from the both ends in the width direction toward the center in the width direction, the shrink label 20 is uniformly shrunk and the aesthetic appearance of the final product can be maintained.

  In addition, in FIG. 4, although the aspect which applied the label 20 to the trunk | drum of the upper side of the horizontal groove 18 was shown, the label 20 can also be applied to the trunk | drum of the lower side of the horizontal groove 18, and in this case, the bottom side Needless to say, the ridgeline 17 is projected and the boundary ridgeline between the lateral groove 18 and the side wall of the lower body portion 13 adjacent to the ridgeline 17 is projected.

  The above description shows only some of the embodiments of the present invention, and these configurations can be combined with each other or various modifications can be made without departing from the spirit of the present invention. For example, when the present invention is applied to a relatively small-capacity bottle or a thick-walled bottle, as shown in FIG. 5, it is possible to provide only a recess without providing a lateral groove. Further, the shape of the bottle is not limited to a substantially square cross section, and may be a flat cross section, a circular cross section, or the like. Furthermore, the label attached to the bottle is not limited to the shrink label, but may be a belt-like seal label, a stretch label having stretchability, or the like.

  According to the present invention, it is possible to provide a synthetic resin bottle in which the ridge line shape of the concave portion provided in the body portion is optimized and the rigidity of the concave portion is improved.

(A) is a front view of the typical bottle according to this invention, (b) is a bottom view of the bottle shown to (a). It is sectional drawing on the AA line of Fig.1 (a). It is a front view which expands and shows the principal part of the bottle shown to Fig.1 (a). It is a front view which expands and shows the principal part of the bottle which fixed the label, and shows in the state which fractured | ruptured a part of label. It is a front view of the bottle of the other embodiment according to this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Bottle 11 Mouth part 12 Shoulder part 13 Body part 14 Bottom part 15 Recessed part 16 Recessed part mouth side ridgeline 17 Recessed part bottom side ridgeline 18 Horizontal groove 19 Boundary ridgeline between the lateral groove and the side wall of the trunk part 20 Label

Claims (4)

In the synthetic resin bottle, which has a body part connected from the mouth part via the shoulder part, and in this body part, a recess that is recessed toward the inside of the bottle is formed.
A synthetic resin bottle characterized in that at least one of the mouth side ridge line and the bottom side ridge line of the recess has a shape in plan view in which a central portion in the width direction protrudes toward the other ridge line.   The synthetic resin bottle according to claim 1, wherein the mouth side ridge line and the bottom side ridge line of the recess are substantially parallel.   The synthetic resin bottle according to claim 1 or 2, wherein a pair of the concave portions are formed on opposing side walls of the body portion, and a lateral groove extending between the concave portions along the circumferential direction is formed.   4. The synthetic resin bottle according to claim 3, wherein a boundary ridge line between the lateral groove and the side wall adjacent to the ridge line protruding from the concave portion has a shape in plan view in which a central portion in the width direction protrudes toward the concave portion.

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