JPH0811858A - Plastic bottle - Google Patents

Abstract

PURPOSE:To provide a plastic bottle having at its upper half part a bottle label part which affords a wide label winding range and prevents the distortion of the surface of a label wound around the bottle. CONSTITUTION:The outer periphery of a body part 12 of the bottle label part 11 at the upper half of a bottle is composed of a plurality of panel faces 13 which are arranged in an adjoining manner amounting to a number of 10-18 and whose contour appears as a straight face. When the bottle label part 11 is subjected to pressure reduction or external force, since the bottle label part 11 is composed of the plurality of panel faces 13 which amount to a number of 10-18 and whose contour appears as the straight face, the ridge 16 between each adjoining panel face 13 acts as a rib in order to improve the strength of the bottle label part 11 and suppress its deformation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wall structure of a plastic bottle, and more particularly to a shape of a wall of a so-called bottle label portion in an upper half of the plastic bottle.

[0002]

2. Description of the Related Art A plastic bottle such as a PET bottle has an internal capacity of 1 liter, 2 liters or 3 liters and is made of a material such as polyethylene terephthalate (PET). Such a plastic bottle is usually molded by biaxial stretch blow molding, and after biaxial stretch blow molding, heat set at a temperature of 100 to 170 ° C. to increase the crystallinity and is manufactured as a heat resistant plastic bottle.

[0003]

As described above, the heat-resistant plastic bottle is heat-set at the time of molding, and if it is not sufficiently cooled, it will have heat, and especially the upper half of the bottle wall is prone to sink marks. There is a challenge to increase the processing speed and reduce the weight of materials, and the manufacturing conditions and usage conditions of plastic bottles are becoming severe. In such a plastic bottle, in order to prevent deformation of the bottle due to internal decompression after heating and filling the contents, the lower half of the plastic bottle is provided with the panel wall portions 7 adjacent to each other as shown in FIG. ing. When the pressure is reduced, the panel wall portion 7 is deformed inward to absorb the reduced pressure inside the bottle, and local deformation of the bottle can be prevented.

However, in the upper half of the plastic bottle, this portion is usually called a bottle label portion, and a portion around which a shrink label or the like for displaying a description of the contents or visually displaying the contents is wound. Is used as. Then, as a measure for preventing the deformation of the bottle label portion, as shown in FIG. 8, the curvature of the curved surface of the upper half portion 8 from the shoulder portion 12 of the bottle label portion 11 to the nozzle portion is made small, or the bottle label portion 11 is circled once. Although a concave bead has been provided, reducing the curvature of the bottle label part causes the shrinkage ratio of the shrink label to increase at the upper and lower ends, inevitably reducing the label range.
In some cases, it may be inconvenient to wrap a label of an appropriate size, and providing a concave bead 9 that goes around the bottle label portion as shown in FIG. 9 may cause a problem that the label screen is distorted. Further, the shoulder portion 12 of the plastic bottle is liable to have a sink mark after the bottle is molded, and this portion becomes wavy, and the label screen may be distorted in the same manner.

Under these circumstances, it has been desired to develop a shape of the bottle label portion which does not distort the wrapped label screen while ensuring a wide range for attaching the label. This invention has been made in view of the circumstances as described above, and it is possible to secure a wide range of wrapping the label, and the bottle label part of the upper half of the bottle that does not cause distortion in the wrapped label screen. It is intended to provide a plastic bottle having the same.

[0006]

To this end, the plastic bottle of the present invention has the outer circumference of the body of the bottle label portion of the upper half located adjacent to each other, and the outer contour appears as a straight surface. It is characterized by comprising a plurality of panel surfaces of 10 to 18.

[0007]

When the bottle label portion is depressurized or an external force is applied, the bottle label portion is composed of a large number of panel surfaces of 10 to 18 whose outer contour appears as a straight surface, and between the adjacent panel surfaces. The ridge portion of the above functions as a rib to improve the strength of the bottle label portion and suppress the deformation of the bottle label portion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings showing an embodiment. In FIG. 1, 1 is a plastic bottle. The plastic bottle 1 has an internal volume of, for example, 1 liter to 3 liters, and is made of a material such as polyethylene terephthalate (PET) molded by biaxial stretch blow molding. Plastic bottle 1
A nozzle portion 3 is provided on the upper end of the body portion 2 of the
The lower end of is closed at the bottom 4. The body 2 has a constricted portion 5 substantially in the center, and a number of panel walls 7 for absorbing reduced pressure are formed adjacent to each other in the lower half 6 of the bottle below the constricted portion 5. Have gone around.

An upper half portion 8 of the bottle above the necked portion 5 of the body portion 2 has a bottle label portion 11 and a shoulder portion 12 above the bottle label portion 11, and the nozzle portion 3 is provided on the shoulder portion 12. The bottle label portion 11 is composed of a plurality of panel surfaces 13 positioned adjacent to each other. As shown in FIG. 2, the panel surface 13 is a surface whose outer contour appears as a straight line when the nozzle portion 3 is observed as a cross section cut by an imaginary plane perpendicular to the center line 14 of the bottle. It is a surface having a shape like that when the bottle-shaped bottle label portion 11 is scraped off by a linear blade. Then, the outer contour appears as a straight line.
The panel surface 13 may be a convex surface whose cross section cut by a flat surface has a substantially straight line, for example, a radius of curvature of 200 to 500 R (mm) so that a gap is not formed between the panel surface 13 and the label surface.

The number of panel surfaces 13 forming the outer peripheral surface of the bottle label portion 11 is preferably 10 to 18 as shown in FIG. When the number of panel surfaces 13 is less than 10, when the label is attached to the bottle label portion 11, the gap between the label and the panel surface 13 becomes large, and the bottle is not washed before filling the contents. Wash water may enter,
Alternatively, the washing water may remain, and the water used in the pasteurizer at the time of filling the contents may infiltrate or remain, which is not preferable. Further, when the number of panel surfaces 13 exceeds 18 surfaces, the bottle label portion 11
Has a substantially circular cross-sectional shape, the reinforcing effect is reduced, and sink marks easily occur after bottle molding.

As shown in FIG. 1, the height of the panel surface 13 is approximately three-fourths of the height of the bottle label portion 11, and the shoulder portion 12 of approximately one quarter of the bottle label portion 11 may be left. Alternatively, as shown in FIG. 3, the panel surface 13 may be extended to just below the nozzle portion 3 with almost no shoulder 12 left. Further, as shown in FIG. 3, a vertical concave bead 15 may be provided in the panel surface 13 in the height direction, or a lateral concave bead may be appropriately provided in the height direction, although not shown. The direction of the panel surface 13 may be the direction along the center line 14 of the bottle as shown in FIGS. 1 and 3, or may be formed inclined with respect to the center line 14 of the bottle as shown in FIG. . Each panel surface 13 may be configured as a single surface, or each panel surface 13 may be configured as two types of panel surfaces 13a and 13b as shown in FIGS.

Furthermore, when the radius of curvature in the height direction of the panel surface 13 is large, for example, when it is 200 R (mm) or more,
The equal fraction is preferably 10 to 16 faces, and particularly preferably 12 to 14 faces. On the other hand, when the radius of curvature in the height direction of the panel surface 13 is small, for example, less than 200 R (mm), 14 to
Eighteen faces are desirable, and 16 to 18 faces are particularly preferable.

[0013]

In the plastic bottle 1 thus constructed, the label is wound around the bottle label portion 11. The bottle label portion 11 has a large number of panel surfaces 13 of 10 to 18 whose outer contour appears as a straight surface,
Since the boundary between the respective panel surfaces 13 becomes the ridge line 16, the ridge line portion functions as a rib to enhance the rigidity of the bottle label portion 11, to generate sink marks after the bottle is molded, and to reduce the pressure after filling the contents. Deformation of the bottle label portion 11 is suppressed against external force. When the concave bead 15 is provided in the panel surface 13 as shown in FIG. 3, the vertical concave bead 15 or the lateral concave bead further functions as a rib even when a large external force acts such that the ridge portion is deformed. However, since the elastic restoring effect is exhibited against the elastic deformation of the bottle label portion 11, the effect of holding the shape of the bottle label portion 11 in the original shape is great.

Since the number of panel surfaces 13 is 10 to 18, even if a label is wound around this, the panel surface 1
A gap is less likely to occur between the label 3 and the label, and it is possible to prevent the cleaning liquid from entering and remaining, and the pasteurizer liquid from entering and remaining. Further, as described above, the rigidity of the bottle label portion 11 is increased, and the bottle label portion 11 exhibits resistance to pressure reduction, deformation due to external force, or sink mark after bottle molding. Further, when the shrink label is contracted, the ridge line 16 serves as a fulcrum to regulate the contraction of the label, and the contraction is surely performed without disturbing the image.

[Brief description of drawings]

FIG. 1 is a front view of a plastic bottle.

FIG. 2 is an explanatory view of various cross sections of a plastic bottle.

FIG. 3 is a front view of another plastic bottle.

FIG. 4 is a front view of another plastic bottle.

FIG. 5 is a front view of another plastic bottle.

FIG. 6 is a front view of another plastic bottle.

FIG. 7 is a front view of a conventional plastic bottle.

FIG. 8 is a front view of another conventional plastic bottle.

FIG. 9 is a front view of another conventional plastic bottle.

[Explanation of symbols]

 1 Plastic Bottle 2 Body 3 Nozzle 4 Bottom 5 Constriction 6 Lower Half 7 Panel Wall 8 Upper Half 11 Bottle Label 12 Shoulder 13 Panel Surface 13a, 13b Panel Surface 14 Centerline 15 Vertical Recessed Bead 16 Ridge Line

Claims (2)

[Claims] 1. The outer periphery of the body of the bottle label portion of the upper half portion,
Located next to each other, with outer contours appearing as straight surfaces 1
A plastic bottle characterized by comprising a plurality of panel surfaces from 0 to 18. 2. The plastic bottle according to claim 1, wherein a concave bead is provided on a part of the panel surface.