JPH0320276Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a bottle having a flat upper surface on the shoulder portion and having an upright spout to which a positioning screw cap is assembled.

[Conventional technology]

In the past, many bottles made of synthetic resin had an upper surface of the shoulder on which the mouthpiece was placed, which was sloped or curved. This is because these bottles were formed by blow molding.

In this blow molding, an extruded cylindrical parison is inflated by the pressure of a pressurized fluid and formed into a bottle, so it is possible to mold a relatively wide wall portion in the radial direction. As a result, the wall thickness of this wall portion must be extremely thin compared to other wall portions, and the container will not have sufficient mechanical strength.

For this reason, the portion where it is necessary to increase the diameter of the bottle to be blow molded, that is, the shoulder portion, inevitably has an inclined wall or a spherical arc wall structure.

For this reason, if you want to obtain a bottle with a flat upper surface on the shoulder, it is impossible to use the blow molding method to mold this bottle, and even if it is troublesome, it is necessary to mold the bottle into at least two parts. A method was used in which the parts were divided into two parts and in-die extension molded, and the in-die extension molded parts were assembled and tightly adhered.

The bottle molded by the conventional method described above is
Almost without exception, the bottle body is divided into two parts: a combination of the body and the bottom plate, and a combination of the shoulder and the mouthpiece, and the upper end of the body is tightly fixed to the lower peripheral edge of the shoulder. It is in a molded form.

This is because by integrating the body, which is the main part for storing the liquid content, and the bottom plate, this part can be made completely liquid-tight.

[Problem that the invention attempts to solve]

However, there is one major problem with the bottle having a flat upper shoulder surface, which is produced by the above-mentioned injection molding and fixing process.

As mentioned earlier, at least the two parts are fixed together, but this fixed part inevitably has weaker mechanical strength than the other parts, so when it falls on the floor, etc. If a strong impact is applied to the bottle, the fixed part may break or come apart.

[Means for solving problems]

The object of the present invention is to solve the above-mentioned problems and provide a synthetic resin bottle with a flat shoulder upper surface to which a positioning screw cap is attached.

This will be explained below with reference to the figures.

The bottle 1 according to the present invention has a flat upper surface of a shoulder portion 7 on which a cap 6 to which a positioning screw cap is attached is erected, and the cap 6 and the shoulder are separately formed by injection molding. A main body 3 consisting of a section 7 and a cylindrical body section 8 integrally provided with the shoulder section 7, a synthetic resin bottle main body 2 to which a bottom plate 4 serving as a bottom wall of the main body 3 is fixed; The body 8 is used to cover the outer surfaces of the body 8 and the bottom plate 4 of the main body 2.
It consists of a cylindrical body 5 in the shape of a bottomed cylinder made of thin metal plate, which is fitted and assembled into the cylindrical body 5.

[Effect]

In the bottle 1 according to the present invention, a divided portion is provided at the lower part of the bottle 1, and the divided portion is fixed and a metal cylinder 5 is fitted therein. Therefore, the fixed area can be completely covered with this metal cylinder 5,
This more than compensates for the mechanical strength of the conventionally weak fixed parts.

Furthermore, by making the cylinder 5 that fits into the body 8 of the bottle and the outer surface of the bottom plate 4 from metal, the above-mentioned effects can be achieved.
In addition to providing the bottle 1 with sufficient mechanical strength, the bottle 1 also has excellent decorative properties due to the luster peculiar to metal.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1, 2, and 3.

This shows a bottle 1 having a threaded opening 6 and a square planar shape, into which a positioning screw cap 14 is screwed. Therefore, a protrusion (not shown) provided on the screw cap 14 collides with the stopper 11 to set the screwing limit position.
Similarly, even if the screw cap 14 is slightly rotated in the reverse screwing direction, the protruding piece of the screw cap abuts against the screw cap, thereby preventing the rotation and maintaining the assembled posture at the screwing limit position. 12 are provided.

A flange 9 is provided around the peripheral end of the shoulder portion 7, and the upper end of the metal cylinder 5 comes into contact with the lower surface of the flange 9 to set the assembly limit position, and the hard and sharp metal cylinder 5 To ensure safety, the top edge of the product does not come into direct contact with hands, etc.

A seal 13 is provided on the lower surface of the top wall of the screw cap 14 against which the upper end of the mouth tube 6 comes into contact to obtain a sealing effect.

There are several methods for fixing each part of a separately molded bottle body, but the bottle body 1 shown in this example is
We use ultrasonic welding, which is the most superior fixing method. Therefore, the material of this bottle body is made of AS resin or ABS resin, which is suitable for ultrasonic welding.

In addition to this, it is also possible, for example, to be made of PP resin and fixed with an adhesive.

The above-mentioned AS resin or ABS resin has high water permeability and poor watertightness, but this drawback is completely compensated for by the fitted metal cylinder 5.

[Effect of idea]

As is clear from the above description, the bottle 1 according to the present invention is formed by injection molding so that the upper surface of the shoulder 7 of the bottle is a flat surface, which is an optimal shape for assembling the positioning screw cap 14.

In addition, by fitting the metal cylinder 5 to the bottle body 2, the fixed part of the bottle body 2, which has some concerns about its strength, has been made perfect, as well as the metal cylinder 5.
The unique metallic luster emitted by the bottle 1 made the bottle 1 highly decorative.

In this way, the bottle 1 according to the present invention deeply pursues the essential conditions required for a synthetic resin bottle to which a positioning screw cap is attached: a flat upper surface of the shoulder, sufficient strength, and excellent decorativeness. It fulfilled all of that.

[Brief explanation of the drawing]

FIG. 1 is a plan view, FIG. 2 is a sectional view taken along line A-A, and FIG. 3 is an exploded sectional view. Explanation of the code, 1... Bottle body, 2... Bottle body, 3...
...Body, 4...Bottom plate, 5...Metal cylinder, 6...
Mouth tube, 7... Shoulder, 8... Body, 9... Flange, 10... Welded part, 11... Stopper, 1
2...Latching protrusion, 13...Putskin.

Claims (1)

[Scope of Claim for Utility Model Registration] A bottle with a flat upper surface of a shoulder on which a cap to which a positioning screw cap is assembled is provided, the cap and the cap being molded separately by injection molding. A main body consisting of a shoulder and a cylindrical body integrally provided with the shoulder, a synthetic resin bottle body having a bottom plate serving as a bottom wall of the main body fixed to each other, the body of the bottle main body, and A bottle body comprising: a cylinder body in the shape of a bottomed cylinder made of a thin metal plate, which is fitted and assembled into the body part so as to cover the outer surface of the bottom plate.