JPH072211U - Plastic bottle with panel - Google Patents

Abstract

(57) [Summary] [Construction] The body portion 1 has a concave panel portion 2, and in the cross-sectional shape of the panel portion 2, the edge 3 enters the inside from the wall surface 11 by a curved surface which is outwardly convex, and the panel is formed. A panel portion, which is continuous with the bottom surface 4 of the part, gently descends toward the center, and a vertical rib 5 having a flat deepest part with a depth of 1 mm or less is formed in the center of the bottom surface. Attached plastic bottle. [Effect] It is possible to obtain a sufficient reduced-pressure absorption effect without uneven thickness during molding and without causing indefinite deformation.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a plastic bottle with a panel portion in which a panel portion for preventing reduced pressure deformation is formed on a body portion.

[0002]

[Prior art]

 Plastic bottles are excellent in transparency, impact resistance, and light weight, and are widely used in food fields.By improving heat resistance, plastic bottles can be filled in a hot state, in the so-called hot pack field. It is used, but after it is hot-packed and sealed, when it is cooled, a reduced pressure is generated in the bottle, and due to this generated reduced pressure, the inward pulling force against the bottle wall is the most thick. Inward bending deformation (generally referred to as decompression deformation) occurs in the thin body, and this deformation causes a problem that the product price is significantly deteriorated.

Therefore, as shown in the cross-sectional view of FIG. 3, the conventional decompression absorption panel section has a vertically elongated decompression absorption panel section 122 formed on the wall surface 111 of the bottle body, and reinforcing ribs 133 are also provided in the panel section. In order to absorb the reduced pressure generated in the bottle by the regular deformation of the panel portion 122, the deformed bottle shape does not look abnormal in appearance.

[0004]

[Problems to be solved by the device]

 However, since the panel part has an uneven shape due to reinforcing ribs, etc. and the wall thickness is likely to be uneven during molding, uneven deformation during loading may cause uneven deformation of the panel part during reduced pressure deformation. There was a dislike for the appearance of the bottle to be poor due to the panel part that did not normally deform under reduced pressure, such as the panel wall of the part being convexly deformed.

[0005]

[Means for Solving the Problems]

 The present invention intends to provide a plastic bottle in which the deformation of the reduced pressure deformation prevention panel portion is devised so that the deformation of the bottle after the reduced pressure deformation is unremarkable, and the gist of the invention is that the body portion has a concave panel portion. , In the cross-sectional shape of the panel part, the edge enters inside from the wall surface by an outwardly convex curved surface and continues to the bottom surface of the panel part, and the bottom surface gently descends toward the center, and the center of the bottom surface. In the plastic bottle with a panel part, a vertical rib having a flat deepest part with a depth of 1 mm or less is formed.

Hereinafter, the present invention will be described with reference to the accompanying drawings. FIG. 1 is a side view showing an example of a plastic bottle with a panel unit according to the present invention, FIG. 2 is a cross sectional view of the panel unit of FIG. 1, and FIG. 3 is a cross sectional view showing an example of a conventional panel unit.

As shown in FIGS. 1 and 2, the present invention has a concave panel portion 2 in a body portion 1, and in a cross sectional shape of the panel portion 2, an edge 3 is formed by a curved surface outwardly convex. It enters from the wall surface 11 into the inside and is continuous with the bottom surface 4 of the panel portion, and the bottom surface 4 descends gently toward the center, and a vertical rib 5 having a flat deepest portion with a depth of 1 mm or less is formed in the center of the bottom surface. It is a plastic bottle with a panel part characterized by the above.

A biaxially stretched bottle of a polyester resin such as polyethylene terephthalate is suitable as the bottle. In the example of FIG. 1, six concave panel portions 2 are formed around the body portion 1. As shown in FIGS. 1 and 2, in the cross-sectional shape, the panel portion 2 has a contour formed by an edge 3, and a vertical rib 5 is formed on a bottom surface 4 of the panel portion therein.

Since the edge 3 is composed of a curved surface which is convex outward, it is easy to fit on the surface of the molding die and does not become extremely thin. Further, since the boundary 31 with the bottom surface 4 of the panel portion has an angular shape, the rib effect works to prevent indefinite deformation of the panel portion, and this portion corresponds to the convex portion of the molding die, so it is angular. It doesn't become so thin. The radius of curvature of the edge 3 is preferably about 3 to 10 mm.

The bottom surface 4 of the panel portion gently descends toward the center, and smoothly deforms in cooperation with the edge 3 and the boundary 31 in accordance with an increase in internal pressure during heat sterilization and the subsequent decompression. Absorb change. The panel bottom surface 4 preferably has a width of 20 to 30 mm.

The vertical rib 5 formed in the center of the bottom surface 4 reinforces the bottom surface 4 to prevent the irregular deformation of the panel portion 2 and has a flat deepest portion with a depth of 1 mm or less. Since the unevenness is less than that of the conventional reinforcing rib 133, the thickness is unlikely to be uneven during molding, and this aspect is also highly effective in preventing irregular deformation of the panel portion.

In the example of FIG. 2, the deepest part of the vertical rib 5 is made flat and the boundary 51 with the rising part is made angular to strengthen the rib effect, and the edge 52 is a curved surface and the wall thickness becomes uneven during molding. To prevent it. In the cross-sectional shape of FIG. 2, it is preferable that the width of the vertical rib 5 is 3 to 7 mm and the radius of curvature of the edge 52 is 1 to 3 mm.

[0013]

[Effect of device]

 According to the present invention, the body has a concave panel part, and in the cross-sectional shape of the panel part, the edge is intruded from the wall surface by the outwardly convex curved surface and continues to the bottom surface of the panel part, and the bottom surface is the center. Since it is a plastic bottle with a panel part, which is characterized by having a vertical rib having a flat deepest part with a depth of 1 mm or less formed in the center of the bottom surface, It is possible to obtain a sufficient vacuum absorption effect without causing unevenness and causing indefinite deformation.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a plastic bottle with a panel portion of the present invention.

2 is a cross-sectional view of the panel portion of FIG.

FIG. 3 is a cross-sectional view showing an example of a conventional panel section.

[Explanation of symbols]

 1 Body 11 Wall 2 Panel 3 Edge 4 Panel bottom 5 Vertical rib

Claims (1)

[Scope of utility model registration request] 1. A body has a concave panel portion, and in the cross-sectional shape of the panel portion, an edge is intruded from a wall surface by an outwardly convex curved surface to be continuous with the bottom surface of the panel portion, and the bottom surface is A plastic bottle with a panel part, characterized in that a vertical rib having a depth of 1 mm or less and having a flat deepest part is formed in the center of the bottom surface, which gently descends toward the center.