JP6034556B2 - Plastic bottle - Google Patents

Description

  The present invention relates to a thin plastic bottle filled with a fluid content such as a liquid, and more particularly to a plastic bottle that is thin and lightweight while ensuring rigidity and improving appearance.

  Conventionally, stretched polyethylene terephthalate bottles called PET bottles and thin plastic bottles (hereinafter simply referred to as “bottles”) made of polyethylene or polypropylene are filled with fluid contents such as shampoos and detergents. It is actively used as a container. These bottles are subjected to various external forces during storage and transportation of empty bottles after molding, transportation, storage and store display of products at the time of filling contents and after filling, and further in the process of use by consumers, etc. It may be deformed so that it cannot be restored.

  In particular, the thinner the outer peripheral wall of the body barrel, the smaller the amount of plastic used, and various effects can be obtained. However, there remains a problem in terms of strength and rigidity. Therefore, the outer wall of the main body of the bottle is partially bent to form a groove-like (circular) rib that circulates around the main body, and the deformation of the bottle is suppressed by the rigidity of this rib. Is called. For example, in Patent Document 1, a corrugated rib that circulates around the main body of the bottle is formed on the outer peripheral wall, so that the swelling of the main body is suppressed as compared with the case where the horizontal rib is formed on the outer peripheral wall, and the full capacity is reached. This enhances the effect of suppressing changes in content when the bottle is fully deformed without deforming the bottle.

Japanese Patent Laid-Open No. 9-240647

  However, in the configuration of Patent Document 1 described above, although the effect of suppressing the change in the full capacity is higher than when a horizontal rib is provided on the outer peripheral wall of the main body barrel, the label is applied to the outer peripheral surface of the main body barrel. The label has a wavy appearance, so there is room for improvement in terms of appearance.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to improve the appearance at the time of labeling while suppressing a change in the full-fill volume in a thin plastic bottle filled with a fluid content. .

As a means for solving the above-mentioned problems, the invention described in claim 1 is a thin plastic bottle filled with fluid content, and a cylindrical main body extending in one direction and having an elliptical cross-sectional shape. The body, a bowl-shaped rib that is formed on the outer peripheral wall of the body body so as to extend linearly when viewed from the outside of the bottle, and circulates around the body body, and the body is aligned along the rib A plurality of recesses formed in the outer peripheral wall of the body portion, each recess being formed in a curved portion of the outer peripheral wall and being formed wider than the groove width of the rib in the width direction of the rib. None the front view circular to emitted tension on both sides in the width direction of the rib, and wherein said a hemispherical concave shape that will be formed deeper than the groove depth in the depth direction of the rib ribs.

The invention described in claim 2
A plurality of the ribs are formed side by side in the extending direction of the main body barrel, and the plurality of recesses are formed in each of the plurality of ribs.
In the invention described in claim 3, the width in the width direction of the rib and the depth in the depth direction of the rib in each of the recesses are 1.2 to 1 of the groove width and the groove depth of the rib, respectively. It is characterized by being set within a range of .8 times.
The invention described in claim 4 is characterized in that the front view center of each of the recesses is located on the center line of the corresponding rib.

According to the first aspect of the invention, by providing a plurality of concave portions that are wider and deeper than the entire width of the linear rib, each concave portion serves as a reinforcement that suppresses expansion (expansion) and contraction in the width direction of the rib. The rigidity of the rib against the expansion and contraction can be increased. This increases the rigidity of the body barrel against the force from the inside of the bottle when filling the bottle with fluid content and the force from the outside of the bottle when gripping the bottle. It is possible to suppress a change in the full volume due to, buckling deformation of the body trunk, and the like.
In addition, by appropriately limiting the width and depth of each concave portion and maintaining the shape of the rib as viewed from the outside of the bottle in a straight line, the label is enlarged even when the label is affixed to the outer peripheral surface of the main body barrel. Compared to the case where corrugated ribs are formed on the body body, the appearance of the bottle is less likely to have a rippled appearance, and the appearance of the bottle at the time of labeling is improved to improve the merchantability. Can be made.

According to the second aspect of the present invention, it is possible to ensure rigidity throughout the extending direction (axial direction) and the circumferential direction of the main body trunk.
According to the invention described in claim 3, the width and depth of each recess is kept within a predetermined magnification with respect to the groove width and depth of the rib, so that the rib shape viewed from the outside of the bottle is linear. The shape of the bottle can be improved when the label is applied.
According to the fourth aspect of the present invention, it is possible to limit the protrusion of the concave portion that is biased toward one side in the width direction of the corresponding rib.

It is a front view of the plastic bottle in the embodiment of the present invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is the C section enlarged view of FIG. It is DD sectional drawing of FIG. It is EE sectional drawing of FIG. It is a top view of the principal part of the state which expand | deployed the outer peripheral wall of the main body trunk | drum of the said plastic bottle in planar shape. It is a front view equivalent to FIG. 1 which shows the modification of the said plastic bottle. It is a front view equivalent to FIG. 1 which shows the other modification of the said plastic bottle. It is an enlarged view equivalent to FIG. 4 which shows the modification of the rib and dimple of the said plastic bottle. It is FF sectional drawing of FIG. It is GG sectional drawing of FIG. It is an enlarged view equivalent to FIG. 4 which shows the other modification of the rib and dimple of the said plastic bottle. It is HH sectional drawing of FIG. It is II sectional drawing of FIG. FIG. 9 is a plan view corresponding to a part of FIG. 7 showing a modification of the relative arrangement of the ribs and dimples.

Embodiments of the present invention will be described below with reference to the drawings.
A plastic bottle (hereinafter simply referred to as a bottle) 1 according to the present embodiment shown in FIG. 1 has a spout portion 2, a shoulder portion 3, a main body trunk portion 4 and a bottom portion 5 in order from the top in the upright state shown in the drawing. Are integrally formed. The bottle 1 is a thin-walled plastic bottle having a full-filled content (the content when the bottle 1 is not deformed and fully filled), such as a shampoo, rinse, clothes refill container, Used for.

The spout part 2 is a cylindrical tube for pouring out the contents of the bottle 1, and a screw 2a for cap attachment is formed on the outer peripheral surface thereof.
The shoulder portion 3 extends from the base portion of the spout portion 2 toward the outer periphery and downward so as to gradually expand while forming a convex curved shape outward of the bottle. The lower end of the shoulder portion 3 is connected to the upper end of the upper maximum outer shape portion 4 a of the main body trunk portion 4. In addition, the code | symbol 3a in a figure shows the ridgeline in alignment with the lower end of the shoulder part 3 and the upper end of the upper largest external shape part 4a.

  Referring also to FIG. 2, the main body body 4 has an elliptical cross-sectional shape that is long to the left and right and extends vertically. The main body barrel 4 has the elliptical cross-sectional shape substantially constant and extends vertically, and the cross-sectional shape is slightly enlarged via the upper and lower stepped portions 4d above the label attaching portion 4b. The upper maximum outer shape portion 4a that is continuous and the lower maximum outer shape portion 4c that is continuous with a slightly enlarged cross-sectional shape via a lower small step portion 4e below the label attaching portion 4b. The outer peripheral wall 6 of the label sticking portion 4b forms an outer peripheral surface 7 that linearly extends vertically so that a product label such as a shrink label can be attached (see FIG. 5). In addition, the code | symbol CO in a figure shows the bottle center axis line along the extension direction (up-down direction) of the main body trunk | drum 4. FIG.

  Referring also to FIG. 3, the bottom 5 projects a pair of left and right corners 5 a on the front side and a pair of left and right corners 5 a on the rear side as it goes downward from the upper part connected to the lower end of the lower maximum outer shape part 4 c of the main body barrel part 4. By doing so, it gradually changes to a rectangular cross-sectional shape that is long to the left and right and rounded. The bottom 5 and the body trunk 4 have substantially the same left-right width X0, but the front-rear width Y1 at the bottom of the bottom 5 is slightly larger than the front-rear width Y0 of the body trunk 4. The lower end of the bottom portion 5 is bent in an arc shape from the outer peripheral side toward the inner peripheral side to form the grounding edge 5b, and then a curved bottom surface 5c that is convex upward is formed on the inner peripheral side of the grounding edge 5b.

The material of the bottle 1 is a plastic such as polyethylene terephthalate (PET), low density polyethylene (LDPE), high density polyethylene (HDPE), polypropylene (PP), polyvinyl chloride (PVC), and the elastic modulus (Young's modulus) is It is set within the range of 500 MPa to 3500 MPa.
The bottle 1 is an ultra-thin plastic bottle having a ratio indicated by resin amount / full-fill volume (g / ml) of about 0.030 to 0.015, and the wall thickness of the outer peripheral wall 6 of the main body body 4. Is in the range of 0.1 to 0.2 mm (the average thickness of the entire bottle is 0.1 to 0.3 mm).

  The height H0 from the grounding edge 5b of the bottle 1 to the upper end of the spout portion 2 is about 190 mm, and the left and right widths (upper maximum outer shape portion 4a, lower maximum outer shape portion 4c and left and right width X0 of the bottom portion 5) are about 68 mm, The front-rear width (front-rear width Y1 of the bottom part 5) is about 56 mm, the vertical width H1 from the upper end of the spout part 2 of the bottle 1 to the upper end of the label attaching part 4b is about 50 mm, and the vertical width H2 of the label attaching part 4b is about 80 mm. The vertical width H3 from the lower end of the sticking part 4b to the ground edge 5b is about 60 mm.

Referring to FIGS. 1 and 5, the outer peripheral wall 6 of the label sticking portion 4 b has a plurality of upper and lower annular ribs 11 that circulate around the label sticking portion 4 b in parallel with a plane (horizontal plane) that contacts the grounding edge 5 b (for example, vertically). (5 stages) are formed at regular intervals.
The rib 11 has a cross section orthogonal to the circumferential direction of the label applying part 4b (hereinafter referred to as the bottle peripheral direction) by partially bending and bending the outer peripheral wall 6 of the label attaching part 4b inward of the bottle. It is formed in a groove shape (a bowl shape) having a semi-circular cross-sectional shape. In addition, the code | symbol C1 in a figure shows the width direction centerline of the rib 11 on the outer peripheral surface 7 notched by the rib 11. FIG.

  The groove width (vertical width) H4 of the rib 11 is about 3 mm, and the groove depth Y4 is about 1.2 mm. The distance H6 between the groove width center lines C1 of the adjacent ribs 11 (pitch between the adjacent ribs 11, see FIG. 7) is about 15 mm. In addition, the distance between the upper end of the label sticking part 4b and the groove width center line C1 of the uppermost rib 11, and the distance between the lower end of the label sticking part 4b and the groove width center line C1 of the lowermost rib 11 Is about 9.5 mm.

A plurality of dimples (concave portions) 12 arranged along the ribs 11 are formed on the ribs 11 on the outer peripheral wall 6 of the label attaching portion 4b.
4-7, the dimple 12 has a circular shape with a radius of about 2.5 mm when viewed from the front (viewed in the normal direction of the outer peripheral surface 7 of the main body barrel 4) shown in FIGS. The depth from 7 to the deepest part inward of the bottle is a hemispherical concave shape having a depth of about 1.5 mm.

  That is, the dimple 12 has a width H5 wider than the groove width H4 (about 3 mm) of the rib 11 in the width direction of the corresponding rib 11 (about 5 mm corresponding to the diameter, about 1.6 times the groove width H4). And a depth Y5 (about 1.5 mm, about 1.3 times the groove depth Y4) deeper than the groove depth Y4 (about 1.2 mm) of the rib 11 in the depth direction of the corresponding rib 11 Is formed.

  In the front view of the dimple 12, the center position (front view center) C <b> 2 is on the groove width center line C <b> 1 of the corresponding rib 11. Therefore, the dimples 12 project evenly on the upper and lower sides (both sides in the width direction) of the corresponding ribs 11 when viewed from the front.

The dimple 12 crosses the inner peripheral surface of the corresponding rib 11 so as to be partially cut away, thereby suppressing expansion (development) and contraction of the rib 11 in the width direction. In other words, the dimples 12 function as short ribs that reinforce the dimples 12 by intersecting and crossing the corresponding ribs 11.
As a result, even if a force for expanding or contracting each rib 11 in the width direction due to the influence of the internal pressure or the like of the bottle 1 or the influence of the gripping force on the bottle 1 or the like occurs, each rib 11 is By being reinforced as described above, the expansion and contraction of each rib 11 and thus the label attaching portion 4b can be suppressed.

  The dimensions of the dimple 12 are appropriately limited so that the rib 11 is maintained in a linear form when viewed from the outside of the bottle for the sake of appearance when a product label is applied to the outer peripheral surface 7 of the label attaching portion 4b. Is done. Specifically, the width H5 of the dimple 12 in the width direction of the rib 11 is set to be within a range of 1.2 to 1.8 times the groove width H4 of the rib 11. Similarly, the depth Y5 of the dimple 12 in the depth direction of the rib 11 is set to be in the range of 1.2 to 1.8 times the groove depth Y4 of the rib 11.

  Further, the pitch H6 between the vertically adjacent ribs 11 is set to be 8 mm to 20 mm (more preferably 10 mm to 15 mm) so that the dimples 12 of the vertically adjacent ribs 11 do not approach too much.

  Sixteen dimples 12 are arranged on each rib 11 along the longitudinal direction (bottle circumferential direction). At this time, the pitch S1 between the front view centers C2 of the dimples 12 adjacent in the bottle circumferential direction is about 11 mm in the present embodiment. The dimples 12 of the ribs 11 adjacent to each other in the vertical direction are arranged so as to be shifted by a half of the pitch S1 in the bottle circumferential direction. In other words, the dimples 12 are arranged in a zigzag manner in the vertical direction.

  Here, the bottle 1 of the present embodiment, the base-shaped bottle in which the rib 1 and the dimple 12 are eliminated from the bottle 1, the horizontal rib bottle in which only the dimple 12 is eliminated from the bottle 1, and the rib 11 and the dimple 12 are eliminated from the bottle 1. Table 1 shows the results of the evaluation of “rigidity”, “restoring force”, “label wrinkle” and “full amount change” with respect to the corrugated rib bottle in which the corrugated rib is formed around the label affixing portion 4b. Shown in In Table 1, “Example” indicates the bottle 1, “Base” indicates the base-shaped bottle, “Horizontal rib” indicates the horizontal rib bottle, and “Wavy rib” indicates the corrugated rib bottle. In addition, “◯” in each column of Table 1 indicates a pass and “X” indicates a failure.

The “rigidity” means that each bottle is filled with a specified amount of content liquid, and vacuum is applied from the spout portion to reduce the pressure so that each bottle loses its appearance (such as the occurrence of a dimple-like deformation). Judgment is based on the size of the reduced capacity.
In addition, the “rigidity” is determined by placing each bottle on the inspection table so that the body torso is horizontal, and pressing the upper center of the body torso from above with an attachment with a load cell. It is also determined by the magnitude of the pushing force (reaction force) when displaced by a predetermined amount.

  The “restoring force” is set by laying each bottle on the inspection table so that its body torso is horizontal, pressing the upper center of the body torso from above with an attachment with a load cell, and sitting on the body torso. After the bending deformation is generated, the determination is made based on the deformation recovery state when the attachment is returned to the position before pressing.

  The “label wrinkle” is determined based on the quality of appearance including wrinkles and the like generated on the shrink label after the shrink label is attached to the main body barrel and heated, and the shrink label is brought into close contact with the main body barrel.

  The “full amount change” is the measurement of the weight of each bottle filled with water by submerging it in the water tank and the weight of each bottle filled with water by a normal filling method placed on the floor. From these measured values, each bottle filled with water in the latter state affected by the weight of the contents and the full capacity of each bottle filled with water in the former state where there is no influence such as the weight of the contents Are determined based on the difference between the full capacity in the former state and the full capacity in the latter state of each bottle.

  From the evaluation results shown in Table 1, the bottle 1 of the present embodiment is superior to each comparative example in any of the items “rigidity”, “restoring force”, “label wrinkle”, and “full amount change”. I understood.

Next, in each case where the number of the dimples 12 for each rib 11 in the bottle 1 of this embodiment is 24, 20, 16, and 12, the change in reaction force with respect to the displacement amount of the main body barrel 4 and the label Evaluation was performed based on the quality of appearance at the time of application.
As a result, if the number of the dimples 12 for each rib 11 is 16 or more, the reaction force against the displacement amount of the main body barrel 4 is ensured substantially equal, whereas the number of the dimples 12 for each rib 11 is 12. In the case of individual pieces, it has been found that the reaction force against the displacement amount of the main body barrel 4 decreases.

  On the other hand, if the dimples 12 adjacent to each other in the circumferential direction of the bottle come into contact with each other and are fused, it becomes a substantially wide rib and the label wrinkle is easily noticeable. Therefore, the number of the dimples 12 for each rib 11 is 24. The following are appropriate. In the bottle 1, the number of the dimples 12 for each rib 11 is preferably about 16. At this time, the pitch S1 between the front-view centers C2 of the dimples 12 adjacent in the bottle circumferential direction for each rib 11 is about 11 mm.

  As described above, the bottle 1 in the above embodiment is a thin plastic bottle filled with fluid contents, and has a cylindrical main body portion 4 extending along one direction, and the main body portion 4. A flange-like rib 11 formed on the outer peripheral wall 6 so as to extend linearly when viewed from the outside of the bottle, and an outer periphery of the main body barrel 4 aligned with the rib 11 A plurality of dimples 12 formed on the wall 6, each dimple 12 being formed wider than the groove width H4 of the rib 11 in the width direction of the rib 11 and projecting to both sides of the rib 11 in the width direction, And it is formed deeper than the groove depth Y4 of the rib 11 in the depth direction of the rib 11.

According to this configuration, by providing a plurality of dimples 12 (dents) wider and deeper than the entire width of the linear rib 11, each dimple 12 suppresses expansion (development) and contraction in the width direction of the rib 11. It becomes reinforcement, and the rigidity of the rib 11 against the expansion and contraction can be increased. For this reason, the rigidity of the main body barrel 4 with respect to the force from the inside of the bottle when filling the bottle 1 with fluid content and the force from the outside of the bottle when holding the bottle 1 is increased. It is possible to suppress a change in the full capacity due to the swelling of the portion 4, a buckling deformation of the main body barrel portion 4, and the like.
Moreover, when the label is affixed to the outer peripheral surface 7 of the main body barrel portion 4 by appropriately limiting the width and depth of each dimple 12 and maintaining the shape of the rib 11 viewed from the outside of the bottle in a straight line shape. The appearance of the bottle 1 when the label is affixed is less likely to make the label appear undulating and the change in the full capacity of the bottle 1 is suppressed compared to the case where the corrugated ribs 11 are formed on the main body barrel 4. The merchantability can be improved.

  The bottle 1 has a plurality of ribs 11 arranged in the extending direction of the main body barrel 4, and the plurality of dimples 12 are formed on each of the plurality of ribs 11. Rigidity can be ensured over the entire extending direction (axial direction) and circumferential direction.

  Further, in the bottle 1, the width H5 in the width direction of the rib 11 and the depth Y5 in the depth direction of the rib 11 in each dimple 12 are the groove width H4 and the groove depth Y4 of the rib 11, respectively. By setting within the range of 1.2 to 1.8 times the length of the bottle 11, it is possible to maintain the shape of the rib 11 viewed from the outside of the bottle in a straight line and improve the appearance of the bottle 1 at the time of labeling. .

  Further, the bottle 1 can effectively suppress the expansion and contraction in the width direction of the corresponding rib 11 by making each of the dimples 12 into a concave shape that is circular and hemispherical when viewed from the front. Since the front-view center C <b> 2 of each dimple 12 is positioned on the corresponding groove width center line C <b> 1 of the rib 11, the protrusion of the dimple 12 that is biased toward one side in the width direction of the corresponding rib 11 can be limited.

Note that the present invention is not limited to the above-described embodiment, and a configuration in which the dimples 12 are arranged in the vertical direction as in a bottle 1 ′ shown in FIG.
Here, the bottle 1 in which the dimples 12 are arranged in a zigzag manner in the vertical direction as shown in FIG. 1 and the bottle 1 ′ in which the dimples 12 are arranged in the vertical direction as shown in FIG. When the “rigidity” and “restoring force” were evaluated, it was found that there was no significant difference between them.

  Moreover, the rib 11 may incline with respect to the grounding edge 5b (horizontal plane) and circulate around the label sticking part 4b like the bottle 1 '' shown in FIG. A configuration in which the spiral ribs are connected is shown, and an inclined rib and a horizontal rib may be appropriately combined.

  Moreover, the form of the rib and recessed part formed in the label sticking part 4b is also various, for example, like the rib 11 'shown in FIGS. 10-12, the trapezoid shape which protrudes inward in a bottle in the cross section orthogonal to a bottle circumferential direction. It may have a cross-sectional shape or a triangular cross-sectional shape that protrudes inward of the bottle in a cross-section perpendicular to the peripheral direction of the bottle, such as a rib 11 ″ shown in FIGS.

Moreover, as a reference example, like a concave portion 12 ′ shown in FIGS. 10 to 12, a truncated pyramid (or a truncated cone) shape recessed inward of the bottle, or a concave portion 12 ″ shown in FIGS. It may be in the shape of a pyramid (or cone) recessed inward of the bottle.

In addition, as a reference example, the front-view shape of the recess 12 may be various polygons including a triangle and a quadrangle, and may be a free shape such as a flower shape or an animal shape in addition to a geometric shape.
Further, the groove width, vertical pitch, and the like of the ribs 11 may be equal or appropriately changed, and similarly, the size, circumferential pitch, and the like of the recesses 12 may be equally or appropriately changed.

Furthermore, as shown in FIG. 16, the front center C <b> 2 of the recess 12 may be shifted from the corresponding groove width center line C <b> 1 of the rib 11 in the front view. However, it is set as the shift | offset | difference of the range which the recessed part 12 protrudes in the width direction both sides of the corresponding rib 11. FIG.
Moreover, the rib 11 does not necessarily need to be continuous in the bottle circumferential direction (may be interrupted). The number and formation positions of the ribs 11 are appropriately set according to the design, the purpose of use, the container capacity, and the like.
And the structure in the said embodiment is an example of this invention, A various change is possible in the range which does not deviate from the summary of the said invention.

1, 1 ', 1 "plastic bottle 4 body trunk 6 outer peripheral wall 11, 11', 11" rib H4 groove width Y4 groove depth C1 groove width center line (center line)
12 dimples (recesses)
12 ', 12 "recess H5 width Y5 depth C2 front view center

Claims (4)

In thin plastic bottles filled with fluid content,
A cylindrical body trunk extending with an elliptical cross-sectional shape along one direction;
A rib-shaped rib that is formed on the outer peripheral wall of the main body barrel so as to extend linearly when viewed from the outside of the bottle, and circulates around the main body barrel,
A plurality of recesses formed on the outer peripheral wall of the main body trunk so as to be arranged along the ribs;
Wherein each recess, the is formed in a curved portion of the outer peripheral wall, are wider than the groove width of the rib in the width direction of the rib forms a front view circular to emitted tension on both sides in the width direction of the rib, and plastic bottles, wherein the a hemispherical concave shape that will be formed deeper than the groove depth in the depth direction of the rib ribs.   2. The plastic bottle according to claim 1, wherein a plurality of the ribs are formed side by side in the extending direction of the main body barrel, and the plurality of recesses are formed in each of the plurality of ribs.   The width in the width direction of the rib and the depth in the depth direction of the rib in each recess are set in the range of 1.2 to 1.8 times the groove width and depth of the rib, respectively. The plastic bottle according to claim 1 or 2, wherein The plastic bottle according to any one of claims 1 to 3 , wherein a center of each concave portion when viewed from the front is located on a center line of the corresponding rib.

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