JPH0122666Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a synthetic resin ampoule for pharmaceutical use or soft drink use, which mainly contains oral medicines, injection medicines, etc.

Conventional technology and its problems Conventionally, this type of synthetic resin ampoule has a beak-shaped part at the upper end of a bottomed cylindrical body made of synthetic resin for breaking through a constricted neck having a V-shaped cross section. It is common to have a continuous branch pipe section, and when using the liquid inside, the branch pipe section is broken off at the neck.

However, conventional synthetic resin ampoules of this type have an inherent problem in that it is generally difficult to break off the branch pipe portions. To solve this problem, as shown in Japanese Utility Model Publication No. 41-7191, a spherical bulge is formed at the lower part of the branch pipe.
In addition, attempts have been made to make the neck part an acute angle and make the bottom part thinner, but even in this case, if the neck part is made too acute in order to make it easier to break the branch tube, it will be difficult to blow mold the ampoule. At this stage, the thickness of the bottom of the neck tends to become extremely thin, which may result in the ampoule itself not having the required pressure resistance, or even breakage, resulting in a defective product. In reality, the neck can only be made at an angle of 40 degrees or more, and the wall thickness of the neck must be quite thick, which makes it difficult to easily break off the branch pipe. This has the essential problem that it becomes a hindrance.

The purpose of this invention is to solve the above-mentioned problems and provide a synthetic resin ampoule that allows the branch pipe portion to be easily broken off and has less concerns about pressure resistance and sealing performance.

Means for Solving the Problems Based on the above-mentioned objective, this invention provides beak-like branches that are connected to the upper end of a bottomed cylindrical body 1 made of synthetic resin through a constricted neck 3 having a V-shaped cross section. In the synthetic resin ampoule in which the tube part 2 is connected, the upper part of the shoulder surface of the neck part 3 on the main body 1 side is formed into the thick part 1a, and the opening angle θ of the neck part 3 is in the range of 40 to 60 degrees. A notch 4 having a depth of 1/4 to 1/2 of the thickness of the bottom part of the neck part 3 is provided on the outer peripheral surface of the neck part 3 over the entire circumference of the deep bottom part of the neck part 3. The gist is a synthetic resin ampoule.

Embodiment The ampoule shown in the illustrated embodiment is made of synthetic resin such as polypropylene, and has a bottomed cylindrical body 1.
It is a blow-molded product in which a beak-shaped branch pipe portion 2 is integrally molded through a constricted neck portion 3 having a V-shaped cross section at the upper end of the pipe.

Therefore, the shoulder portion at the upper end of the main body 1 is formed such that the wall thickness of the upper part of the shoulder surface is thicker than the main body peripheral wall, and the wall thickness of the branch pipe portion 2 is thicker than the main body peripheral wall. It is designed not to be easily deformed by the force applied during folding.

Further, the opening angle θ of the neck portion 3 is set in a range of 40 to 60 degrees. If this angle is less than 40 degrees, it will be difficult to make the bottom of the neck 3 have a uniform thickness over the entire circumference by blow molding, making it easy to break, etc., whereas if it exceeds 60 degrees, This is because it becomes difficult to generate sufficient stress concentration at the bottom of the neck portion 3 when the branch pipe portion 2 is broken. Preferably, the angle θ is set to about 45 to 50 degrees.

Furthermore, at the deep bottom of the neck 3, a notch 4 is made in the outer peripheral surface over the entire circumference. This cut 4 is made by secondary processing after the ampoule is formed, and its depth is formed in the range of 1/4 to 1/2 of the thickness of the bottom of the neck 3. If this is too shallow, it will be difficult to remove the branch pipe portion 2, and if it is too deep, severe anxiety will arise. Most preferably, the depth should be about 1/3.

Effects of the invention The synthetic resin ampoule according to this invention has a
The upper part of the shoulder surface on the main body 1 side is formed into a thick wall portion 1a. Therefore, when force is applied to break off the branch pipe portion 2, deformation of the main body 1 side at the shoulder portion can be prevented, and stress concentration can easily occur in the neck portion.

Further, the opening angle θ of the neck portion 3 is set within a range of 40 to 60°. Therefore, when blow molding an ampoule, it is possible to prevent the wall thickness from becoming uneven or extremely thin at the bottom of the neck 3, or even from breaking, and to create a uniform thickness around the neck 3. It can be made to have thickness and strength, and
By having an acute angle of 60° or less, stress can be easily concentrated at the bottom of the neck portion 3 when the branch pipe portion 2 is broken off.

Further, a cut 4 having a depth of 1/4 to 1/2 of the thickness of the bottom part of the neck part 3 is made on the outer periphery over the entire circumference of the deep bottom part of the neck part 3. Since this cut 4 is made by secondary processing, it can be easily formed to a uniform depth around the entire circumference, and the pressure strength of the neck 3 will not be made uneven, and the required strength will be sufficient for it. The neck portion 3 is made to be easily broken by external force.

Therefore, in combination with the above, the ampoule according to this invention solves the difficulty of breaking off the branch pipe part 2, which was considered to be an inherent defect in synthetic resin products, and makes it possible to cut it separately with a cutter or the like. The branch pipe can be easily broken off by hand without any effort, and the branch pipe can be broken off with relatively little force, reducing the reaction when the branch pipe is broken. There is no risk of the contents liquid etc. spilling out. In addition, as shown in Figure 3, it is convenient because the branch pipe can be folded and removed with only one hand if necessary, and is particularly suitable as an injection ampoule where the syringe is often held in one hand. It is something.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; Fig. 1 is a half-cut sectional view, Fig. 2 is a sectional view of the main part, and Fig. 3 is a sectional view of the main part.
The figure is an explanatory diagram showing a usage mode. 1...Main body, 2...Branch pipe portion, 3...Neck, 3a
...Thick wall part, 4...notch.

Claims (1)

[Claims for Utility Model Registration] A synthetic resin body with a beak-shaped branch pipe 2 connected to the upper end of a bottomed cylindrical body 1 made of synthetic resin through a constricted neck 3 having a V-shaped cross section. In the ampoule, the upper part of the shoulder surface of the neck 3 on the main body 1 side is the thick part 1a.
The opening angle θ of the neck 3 is set in the range of 40 to 60 degrees, and the outer circumferential surface of the neck 3 has a thickness of 1/4 to 1/4 of the bottom wall thickness of the neck 3. A synthetic resin ampoule characterized by being provided with a notch 4 having a depth of 1/2.