JP2960483B2 - Manufacturing method of bottle with handle - Google Patents

Description

The present invention relates to a method for producing a bottle with a handle.

[Prior Art] As a method for manufacturing a bottle with a handle, the following manufacturing method is disclosed in JP-A-64-20126.

A bottle provided with a concave portion and a handle support portion below the concave portion is mounted in a mold, and a handle for connecting the bottle mouth portion and the handle support portion is injection-molded in the mold. Alternatively, a bottle having a handle support at the upper part of the recess and the lower part of the recess is mounted in a mold, and the handle support provided at the upper part of the recess and the handle support provided at the lower part of the recess are connected. The handle to be processed is injection molded in a mold.

During the injection molding of the handle, the high-temperature resin constituting the handle comes into contact with the bottle to soften the bottle, and the resin is welded to the bottle, whereby the bottle and the handle are integrated.

[Problem to be Solved by the Invention] In the bottle with a handle manufactured by the above-mentioned conventional technology, the handle is welded to the bottle, so that only the handle and the bottle are integrated. Is not wrapped around the handle. For this reason, the mounting strength of the handle body is low.

Therefore, if the handle is pulled strongly or the liquid is filled to fill the bottle, the handle may be detached from the bottle, which is not suitable for putting a heavy object in the container.

An object of the present invention is to provide a method for manufacturing a bottle with a handle in which the resin constituting the bottle has wrapped around the handle, and the bottle and the handle are tightly fitted.

[Means for Solving the Problems] The gist of the present invention is to provide a method for manufacturing a bottle with a handle, in which a handle and a bottle are integrated, so that the joint of the bottle to which the handle is joined has a glass transition point or higher and a melting point or lower. Immediately after heating, the handle body is pushed into the bottle from the predetermined attachment position of the handle body to form a joined body in which the handle body and the bottle are joined, and further, blow molding is performed near the joint of the joined body. And integrating the handle and the bottle while pushing the handle back to a predetermined mounting position.

In the present invention, a bottle is formed into a predetermined shape by blow molding in advance, and a joint portion where the bottle is joined to the handle is heated to a temperature equal to or higher than the glass transition point and equal to or lower than the melting point. If the heating temperature is lower than the glass transition point, the resin at the joint does not soften, and if it exceeds the melting point, the resin at the joint melts.

The temperature at which the joint of the bottle is heated depends on the resin constituting the joint of the bottle. However, in the case of polyethylene terephthalate resin (hereinafter abbreviated as PET), the glass transition point is about 70 ° C. or higher and the melting point is about Heat below 250 ° C.

The heating means for heating the joint of the bottle is not limited as long as it can heat the resin to a temperature higher than the glass transition point. For example, an infrared heater or the like can be used.

Also, instead of heating the joint of the bottle directly,
The joint of the handle to which the bottle is joined is heated above the glass transition point and below the melting point of the resin that makes up the joint of the bottle, so that when the handle and the bottle are joined, the heat of the handle is used to join the bottle. It may be transmitted to a part.

However, the resin constituting the joint of the handle is not heated to a temperature higher than its melting point.

Next, the handle is pressed into the joint of the bottle and joined, but the method of joining the handle and the bottle is not particularly limited. For example, there is a method in which a handle is pushed into the joint of the softened bottle using an air cylinder or the like.

The distance at which the handle is pushed into the inside of the bottle is preferably 3 to 10 mm inside the mounting position of the handle desired as a product. If it is less than 3 mm, the handle is not sufficiently pushed into the bottle, and if it exceeds 10 mm, the handle is pushed too much into the bottle and the strength of the bottle wall surface is reduced.

Push the handle back to the specified mounting position,
At the time of blow molding in which the bottle and the handle are integrated, a gas of ²⁰ to 30 kg / cm ² may be sealed in the bottle.

The materials of the bottle and the handle used in the present invention are as follows.
There is no particular limitation.

[Action] The present invention softens the resin constituting the joint of the bottle by heating the joint of the bottle to which the handle is joined to the glass transition point or higher and the melting point or lower, so that the handle is easily pushed into the bottle. I do.

At this time, the handle is pushed into the bottle from the position where the desired handle is attached, to form a joined body in which the handle and the bottle are joined, and the joined body is blow-molded. And the bottle.

The handle pressed into the inside of the bottle is pushed back to the predetermined mounting position by the air sealed at the time of blow molding, and at the same time, the resin at the joint of the bottle goes around the joint of the handle, and The handle is fitted.

Example Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2a to 2c, but the present invention is not limited thereto.

FIG. 1 is a cross-sectional view of the mold 10 on which the bottle 20 and the handle 30 are mounted, and FIGS. 2a to 2c are partial cross-sectional views showing the mounting state of the bottle 20 and the handle 30.

FIG. 1 will be described. The bottle 20 has a recess on the side. The concave portion of the bottle 20 is formed in an intermediate shape without undercut, and the other portions are formed in a final shape. The cylinder 40 is arranged so that the handle 30 can be pushed into the recess in the direction of the arrow.

In the present embodiment, the resin constituting the bottle 20 is, for example, PET.
And the resin forming the handle body 30 was, for example, polypropylene. The capacity of the bottle is 1.8.

In addition, the joint portion of the bottle where the bottle 20 is joined to the handle 30
Before the bottle 20 is mounted on the mold 10, the upper and lower walls of the recesses 21a, 21b, for example, by an infrared heater, PE
Above the glass transition temperature of T and below the melting point of PET, for example 10
Immediately after being heated to 0 ° C., it is placed in the mold 10.

The step of joining the bottle 20 and the handle 30 will be described.

The distance by which the handle 30 is pushed into the inside of the bottle 20 is represented by l. 1 is a distance between the stopper 11 provided in the mold 10 and the cylinder 40. By adjusting l, the handle body
30 pushing distances can be adjusted. In this embodiment, l = 10 mm. The distance is about 3 mm larger than the predetermined attachment position of the handle 30 desired as a product.
0 is pushed inside the bottle 20.

The step of fitting the bottle 20 and the handle 30 will be described.

From the bottle mouth 22 of the joined body obtained by joining the bottle 20 and the handle body 30 obtained as described above, pressurized fluid, for example, air from the direction of the arrow 50 by a compressor (not shown), for example, 25 kg / cm Sealed at a pressure of ² . At that time,
The handle 30 is pushed back by 3 mm, and finally pushed into a predetermined position 7 mm inside the obtained bottle 20.

The attached state of the bottle 20 and the handle 30 near the joint 21a of the bottle will be described with reference to FIGS. 2a, 2b, and 2c.

FIG. 2a shows a mounting state immediately after the bottle 20 and the handle 30 are mounted in the mold 10. FIG. 2b shows an attached state of the joined body in which the handle 30 is pushed into the bottle 20. 2c
The figure shows the state of attachment after blowing the pressure fluid and performing blow molding.

In FIG. 2b, the handle 30 is pushed into the bottle 20, and the resin constituting the bottle 20 is simply welded to the joint of the handle 30 and does not go around the joint of the handle 30.
In FIG. 2c, by performing blow molding on the joined body, the resin constituting the bottle 20 wraps around the handle 30 and the bottle 20
And the handle 30 are fitted.

The joint 21b of the bottle also fits with the handle 30 by blow molding, similarly to the joint 21a of the bottle. at the same time,
The upper and lower walls of the recess are also in close contact with the handle body 30 by blow molding, and a final product bottle is obtained.

[Effect of the Invention] As described above, according to the method for manufacturing a bottle with a handle of the present invention, a bottle with a handle in which the bottle and the handle body are strongly fitted can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a mold having a bottle and a handle attached thereto, and FIGS. 2a to 2c are partial cross-sectional views showing a mounting state of the bottle and the handle. 10 …… Die, 11 …… Stopper, 20 …… Bottle, 21a, 21
b… Bottle joint, 22… Bottle mouth, 30… Handle, 40… Cylinder.

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B29C 49/00-49/80

Claims (1)

(57) [Claims] 1. A method of manufacturing a bottle with a handle, in which the handle and the bottle are integrated, wherein the handle is immediately heated after the joint of the bottle to which the handle is joined is heated to the glass transition point or higher and the melting point or lower. Pushing the handle body inside the bottle from a predetermined attachment position to form a joined body in which the handle body and the bottle are joined, and further performing blow molding near the joint of the joined body to attach the handle body to the predetermined attachment position A method for manufacturing a bottle with a handle, wherein the handle and the bottle are integrated while being pushed back to a position.