JPH0352652Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to the structure of a biaxial stretch blow-molded bottle made of synthetic resin such as polyethylene terephthalate resin.

[Conventional technology]

BACKGROUND OF THE INVENTION Synthetic resin bottles are becoming widely used as bottle-shaped containers for storing liquids such as whiskey and soy sauce.

The most effective method for forming this bottle is considered to be a method in which a primary molded product made of a crystalline synthetic resin material is formed into a bottle by biaxial stretch blow molding, and in particular polyethylene terephthalate resin is used. The molded biaxially stretched blow molded bottle is
Although it was thin and lightweight, it had excellent mechanical strength and resistance to contents, and it had many advantages such as being able to be mass-produced at low cost.

[Problem that the invention attempts to solve]

By the way, for this type of bottle, sufficient mechanical strength is ensured through the selection of the resin material as described above, and many improvements have been made to the mechanical strength of the shape. One of the features is a circumferential groove on the body.

This circumferential groove not only improves the internal pressure resistance of the vertically cylindrical body, but also deforms elastically in the initial stage of action against impact forces from above and below, and transfers the impact forces to the circumferential groove. It has the function of absorbing and consuming it through deformation, thereby alleviating the impact of external forces on other parts of the body.

Therefore, the circumferential groove is structurally susceptible to elastic deformation in response to external forces acting from above and below, and is susceptible to deformation in response to continuous downward force, so there is no concern about its buckling strength. It was something to leave behind.

The present invention was devised to solve the problems, drawbacks, and inconveniences of the conventional examples described above.
The purpose is to increase the mechanical buckling strength of the body.

[Means for solving problems]

Hereinafter, the present invention will be explained with reference to the drawings showing one embodiment of the present invention.

The biaxial stretch blow-molded bottle 1 according to the present invention has a circumferential groove 3 in a cylindrical body 2, and a reinforcing groove 3 in the circumferential groove 3 of the body 2 along the axial direction of the body 2. It has a structure in which a plurality of vertical ribs 4 are provided at equal intervals.

The vertical rib 4 is provided to prevent the circumferential groove 3 portion from being unnecessarily elastically deformed due to the downward force acting on the trunk 2.
It is necessary that the elastic deformation of the circumferential groove 3 due to the pressing down force applied as an impact is not hindered as much as possible.

For this reason, the appropriate number of vertical ribs 4 to be provided is 3 to 5, and the length of the circumferential groove 3 between adjacent vertical ribs 4 can be changed instantaneously by the pressing down force that acts impulsively. Allow sufficient elastic deformation.

[Effect]

As described above, the bottle 1 according to the present invention has a structure in which a reinforcing vertical rib 4 is provided in a part of the circumferential groove 3 along the axial direction of the body 2, so that the cylindrical wall portion of the body 2 are continuous from the upper end to the lower end by the vertical ribs 4.

Here, the initial impact force acting on the body 2 is absorbed and consumed by the elastic deformation of the circumferential groove 3.

On the other hand, the vertical ribs 4 face the continuously applied downward force, so that deformation of the circumferential groove 3 is less likely to occur.

In other words, although deformation of the circumferential groove 3 occurs due to the action of the pressing force, the amount of deformation does not become large due to the vertical ribs 4.

〔Example〕

In the illustrated embodiment, the bottle 1 has a substantially cylindrical body 2, and approximately in the center of the body 2,
The circumferential groove 3 ensures strength against rearward force.
are provided around the area.

Further, the vertical ribs 4 provided in the circumferential groove 3 are arranged at four locations at equal intervals as a design consideration, but as long as the buckling strength is ensured, the number of vertical ribs 4 may be less than that. , or more if not secured.

The height and width of the vertical ribs 4 provided in the circumferential groove 3 are as follows:
The depth and width of the circumferential groove 3 are approximately equal, so the protruding end surface of the vertical rib 4 is flush with the outer circumferential surface of the body portion 2.

Further, in the body 2 below the circumferential groove 3, a plurality of flat surface portions 5 are provided at equal intervals along the circumferential direction, and the flat surface portions 5 are designed to prevent negative pressure inside the bottle 1. In the event that deformation occurs due to reduced pressure, it can be absorbed.

[Effect of idea]

As is clear from the above explanation, 2
Since the axially stretched blow-molded bottle has vertical ribs in the circumferential groove, it can appropriately exhibit durability against instantaneous impact force and durability against continuous pressing force. It exhibits many excellent effects such as ensuring buckling strength and being easy to mold.

[Brief explanation of the drawing]

The drawing is a front view of a biaxially stretched blow-molded bottle according to the present invention. Explanation of symbols, 1... Bottle, 2... Body, 3...
Circumferential groove, 4...vertical ribs.

Claims (1)

[Scope of utility model registration request] A biaxial stretch blow-molded bottle comprising a cylindrical body having a circumferential groove, and a plurality of reinforcing longitudinal ribs arranged at equal intervals in the circumferential groove along the axial direction of the body.