JPH0390331A - Thin-walled synthetic resin container with handle and method for manufacturing the same - Google Patents

Abstract

PURPOSE:To strengthen the bonding of a handle to a container and eliminate an insert in the handle by performing the injection molding of the upper end portion of the handle unitarily with the mouth part of the container and making the lower end portion of the handle in one piece with the thin-wall trunk part of the container by joining the locking member of the lower end part of the handle to the wall part of the container. CONSTITUTION:A handle 5 at the side part of a container is bent inwardly at upper and lower end portions 5a, 5b and has a shape forming the protrusion of a locking member 5c at the bottom end of the handle, the upper end portion 5a being unitarily connected to the lower part of the screw part of a mouth 2 by injection molding. The lower end portion 5b of the handle 5 fits the locking member 5c of the bottom end to the wall part 3a of the trunk 3 of the container under pressure to be connected unitarily with the trunk 3. Such a container 1 with the handle 5 can be produced by the stretch-blow molding of an injection- molded preform. By this method, the container 1 with the handle 5 on its side part, whose upper end portion 5a is joined to a thick-wall mouth part 2 while the lower end portion 5b is joined to the thin-wall trunk part 3, can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a container such as a bottle having a thin body and having a handle integrally extending from the mouth to the body.

[Industrial Applications] The container with a handle described in JP-A No. 55-107430 has an inverted-1-shaped handle that extends to the other side integrally formed at the base of the bottle mouth.

In addition, a container with a handle described in JP-A-56-69948@ has a downward L-shaped handle with a ring-shaped upper end formed separately, and the upper end of this handle is fitted to the lower side of the mouth. The lower end is combined with a protrusion formed in 14 parts to integrate the container and the handle.

[IIEi to be Solved by the Invention] Among the above conventional techniques, in the former in which only the upper end portion is formed integrally with the mouth portion, the handle has only one support point;
When a container filled with contents is lifted by the handle, the entire load is concentrated at the top of the handle. Moreover, since the lower end is open, bending stress due to the load acts on the upper part of the handle, making it easy to deform the handle. Also, to pour out the contents,
When the container is tilted by the handle, the grip part opens due to the load, making it difficult to tilt the container as desired and making it difficult to pour, making it difficult to use for large containers.

In the latter case, where the handle has three support points, the upper end and the lower end, the above problem is unlikely to occur, but the ring-shaped upper end must be translated into the mouth when forming the container. Moreover, there are difficulties in forming the container, such as forming the body of the container into a protrusion or step and connecting the lower end of the handle to the body.

This invention was devised to solve the above-mentioned problems of the conventional technology, and its purpose is to provide support for a handle for a container with a thin body at three points: the mouth and the body. Another object of the present invention is to provide a container with a handle of a new configuration that does not require a handle insert during molding, and a method for manufacturing the container.

E"!Means for Solving Problem 4 1 One feature of the present invention according to the above-mentioned object is that in a synthetic resin container having a thick opening and an expanded body having a thin body, the mouth and the upper and lower ends A handle is bent inward and has an engaging element protruding from the lower end, and the upper end of the handle is connected to the lower side of the thread of the mouth part, and the upper end of the handle is integrally injection molded, and the engaging element of the handle is attached to the body. It is a container with a handle, which is press-fitted into the wall of the container and whose lower end and body are integrally joined.

Another feature of the present invention is that the handle has a thick mouth portion, the upper and lower ends thereof are bent inward, and an engaging element is formed protruding from the lower end. A preform with a bottom that is integrally formed by connecting the parts is injection molded, and the preform is formed into a container with a thin body by stretch blow molding, and the expansion pressure of the preform causes the handle to A container with a handle, in which an engaging element is press-fitted into the wall of the body, the lower end is integrally connected to the thin body, and the handle whose upper end is integral with the mouth is formed on the side of the container. It's in the manufacturing method.

[Function 1] In the above configuration, since the handle is connected to both the mouth and the body, even if you lift a heavy container by the handle, the load will not be concentrated at one point on the handle, and the load will not be concentrated at one point on the handle, but will move upward and downward. distributed. For this reason, the handle does not deform or open due to the load, and when it is tilted, the lower end acts as a support point, making it easier to tilt and pouring out the contents.

In addition, since the mouth of the container and the handle are integrally molded, there is no need for an insert, and the connection between the lower end of the handle and the thin body is achieved by connecting the lower end engager and the wall fitted with the engager by press-fitting. Since the joining is done by forming a protrusion or step, the joining is easier and more reliable than when joining is done by forming a protrusion or step.
Sufficiently withstands large loads.

The present invention will be explained in more detail below with reference to illustrated embodiments.

In the figure, 1 is a bottle-shaped container made of thermoplastic synthetic resin such as polyester, vinyl chloride, polypropylene, etc., and consists of a thick mouth 2 with a threaded part around the outer periphery, a thin body 3 and a bottom 4. Become.

Reference numeral 5 designates a handle on the side of the container, which has a shape in which upper and lower ends 5a and 5b are bent inward, and an engaging element 5C is formed protruding from the lower end.
The upper end portion 5a is integrally connected to the lower side of the threaded portion of the mouth portion 2 by injection molding.

Further, the lower end portion 5b of the handle 5 is integrally connected to the body portion 3 by press-fitting the lower end engagement member 5c into the wall portion 3a of the body portion 3.

The container 1 provided with such a handle 5 can be manufactured by stretch blow molding an injection molded preform.

As shown in FIG.
A bottomed preform 6 having integrally formed parts is molded. When designing this preform 6, the length of the handle 5, the lower end 5b
The inclination angle and the like are determined based on the shape and height of the container 1 to be manufactured.

Next, this preform 6 is placed in a blow mold 7 together with a handle 5.
to be accommodated. At this time, as shown in FIG. 3, the handle 5 is held in a groove (not shown) of the same diameter provided in the mold, and only the lower end engagement element 5C is left protruding into the cavity 8.

After the mold is closed, the preform 6 is axially stretched except for the mouth 2 and the handle 5, and expanded in the radial direction by air blowing to form the body 3 and the bottom 4.

As shown in FIG. 4, the wall portion 3a forming the body portion 3 due to the expansion is in contact with the cavity mold surface and surrounds the engager 5C which partially protrudes onto the mold surface, thereby causing the engager 5C and the wall It enters the gap between the portions 3a and is integrally combined with the wall portions 3a.

As shown in FIG. 1, the container 1 taken out after opening the mold has a handle 5 on its side, the upper end 5a of which is connected to the thick mouth 2 and the lower end 5b connected to the thin body 3. It becomes a container with a handle.

[Effects of the Invention] As described above, the present invention has the upper end of the handle integrally injection molded with the mouth, and the lower end connected to the engaging element and the wall.
It is integrated with the thin body, which makes the connection between the handle and the container intimate and strong, so there is no such drawback as when only the upper end is connected, and when manufacturing, Since there is no need for a handle insert, the work is labor-intensive and there is no loss of products due to defective inserts, which also has the advantage of reducing costs.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a thin-walled container with a handle according to the present invention;
FIG. 2 is a longitudinal sectional view of the preform, and FIGS. 3 and 4 are explanatory diagrams of the manufacturing process. 1... Container 3... Body 2... Mouth 3a... Wall 4... Bottom 5... Handle 5a. ... Upper end 5b ... Lower end 5C ... Engagement element 6 ... Preform 7 ... Blow mold 8 ... Capity

Claims (2)

[Claims] (1) In a synthetic resin container having a thick mouth and a thin body, the mouth and a handle are bent inward at the upper and lower ends and have an engaging element protruding from the lower end. The upper end of the handle is integrally injection molded with the upper end of the handle connected to the lower side of the screw at the mouth, and the engager is press-fitted into the wall of the body, so that the lower end of the handle is integrally connected to the body. Thin-walled synthetic resin container. (2) A thick mouth and a handle whose upper and lower ends are bent inward and have an engaging element protruding from the lower end are integrally formed by connecting the upper end of the handle to the lower side of the screw of the mouth. The bottomed preform is injection molded, and the preform is stretch blow molded to form a container with a thin body. Manufacture of a thin-walled synthetic resin container with a handle, characterized in that the above-mentioned handle is press-fitted into the body, the lower end of which is integrally joined to the thin-walled body, and the upper end of which is integral with the mouth is formed on the side. Method.