JPH06300747A - Plug made of plastic - Google Patents

Abstract

PURPOSE:To prevent the damage or the breakage of a plug which seals the gateway of a hermetically sealed container in which a content has been housed. CONSTITUTION:A plug 10 in composed of a head part 11, a screw part 12 and a taper part 13, and it is made of a plastic. The plug is constituted in such a way that a member 16 for reinforcement is buried and installed at the inside of at least the head part 11 and of the screw part 12. By this constitution, the strength of the plug made of the plastic is enhanced, and it is possible to prevent its damage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic plug for sealing the entrance and exit of a container containing a filling. For example, the present invention relates to a plastic plug which is mounted on a column for liquid chromatography and is suitable for preventing the packing such as gel filled in the column from being deteriorated in performance due to leakage from the column.

[0002]

2. Description of the Related Art Conventionally, a column used in a liquid chromatograph is filled with a packing material such as a gel or an adsorbent on the manufacturer side, stored for a required period, and then transported to the user, where the column is It was incorporated into the piping of a liquid chromatography system and used for liquid analysis and the like. During the storage and transportation as described above, a plug was attached to the column and used so that the packing and the like would not leak.

An example thereof will be described with reference to FIG. In the figure, reference numeral 50 denotes a column filled with a packing material such as gel and an adsorbent, and the column 50 has a pipe 51, and inlet / outlet members 60 are provided at both ends of the pipe (see FIG. 2). Indicates only one end of the pipe, and the other end is omitted).

The inlet / outlet member 60 has a plug screw portion 61, a plug taper portion 62, and a cavity 63 formed therein, and an extension portion formed with a screw portion 64 for fixing the inlet / outlet member 60. The inlet / outlet member 60 having the above structure is fixed to both ends of the pipe as follows. That is, the fixing nut 70, the front ferrule 73, and the like are fitted and inserted in the pipe 51 in advance, the filter 52 is interposed, the inlet / outlet member 60 is attached to the end portion of the pipe, and the shoulder portion 65 thereof is brought into contact with the end portion of the pipe 51. The screw portion 64 for fixing the inlet / outlet member 60 and the nut screw portion 74 are screwed together to rotate the nut 70. Then, the nut 70 advances toward the inlet / outlet member 60, and the shoulder portion 71 pushes the front ferrule 73 in the same direction via the rear ferrule 72, and the front ferrule 73 moves in the taper 66 of the inlet / outlet member 60, The taper inner surface and the outer circumference of the pipe 51 are tightly engaged with each other.

As described above, the inlet / outlet members 60 are firmly fixed to both ends of the pipe 51 to assemble the column. Column pipe 51 assembled in this way
Filling agent such as gel from the entrance / exit member 60,
A plug for preventing the disappearance of the contents is attached to the inlet / outlet member 60 of the column.

[0006] The plug is also called an ocinet, and the plug screw portion 61 and the plug taper portion 6 of the column are provided.
2 has a threaded portion and a tapered portion. Then, attach the plug to the column packed as described above,
The thread portion of the plug is connected to the thread portion 61
When it is screwed and rotated, the tapered portions of both the inlet / outlet member 60 and the plug are tightly engaged with each other, the inlet / outlet of the column is sealed, and the leakage of the packing material or the like is prevented.

The packing of the gel or the like into the column 50 as described above is generally carried out by the manufacturer, and the packed column is stored for a required period and then transported to the user's place, where the column is packed at both ends. The plug is removed, and a predetermined pipe is connected to the plug for use in a liquid chromatograph.

By the way, conventionally, the plug is made of a metal or a plastic material. However, since the plug is required to be threaded or completely sealed, it is difficult to taper the plug, resulting in a high manufacturing cost. To solve this problem, plastic plugs have been developed and put into practical use.

[0009]

However, when the column containing the packing is stored or transported for a certain period of time, the plastic plug in the conventional example is
It often projects from the column and collides with foreign matter and breaks, and the broken part of the plug remains inside the column inlet / outlet member, which makes it difficult for the user to use the column. In order to use it, it is necessary to remove the broken portion, and considerable labor is required.

An object of the present invention is to solve the above problems and provide a plastic plug that functions well.

[0011]

In order to achieve the above object, the plastic plug for a column according to the present invention is a plug made of plastic consisting of a head portion, a screw portion and a taper portion, which is used for reinforcement. The plug is made of a plastic, characterized in that the member is embedded, and a head, a screw portion, and a taper portion, and a hollow portion is formed at least inside the head portion and the screw portion, A reinforcing member is inserted and fixed in the hollow portion, and further, in a plug including a head portion, a screw portion and a taper portion, a reinforcing member is present at least inside the head portion and the screw portion. And is integrally formed of plastic.

Therefore, the plastic plug for a column according to the present invention is reinforced by the member embedded therein and is less likely to be broken or damaged.

[0013]

Next, an embodiment of the present invention will be described.

<First Embodiment> FIGS. 1 and 2 show a first embodiment of a plastic plug according to the present invention. FIG. 1 (a) is a side view of the plug, and FIG. 1 (b) is a front view of the plug. It is a figure. In these figures, 10 is a plastic plug, and the plug 10 includes a head portion 11, a screw portion 12
And a tapered portion 13. Inside the plug 10, a hollow portion 14 is formed over a portion corresponding to the head portion 11 and the screw portion 12. A recess 15 is formed inside the head 11.

Reference numeral 17 denotes an intermediate portion formed between the screw portion 12 and the taper portion 13 and having a constant length in the axial direction, which is not tapered, and the tip of the screw portion 12 has a sealing action. The engagement of the tapered portions with each other is not disturbed. Further, 11A is a knurl for preventing slippage when the head is rotated.

The plug is made of POM (polyacetal),
It is made of various engineering plastic materials such as PFA (Teflon) and PE (polyethylene), but preferably P
It is manufactured by molding such as injection molding of EEK (polyether ether ketone).

A screw member 16 made of metal such as stainless steel is screwed and fixed to the hollow portion 14. That is, the metal screw portion 16A of the metal screw member 16 is screwed into the hollow portion 14, and the metal head portion 1 of the metal screw member 16 is
6B sits on the bottom of the recess 15. Metal screw member 1
Although various known screws can be used as 6, a tap screw is used as a preferred embodiment. Although a screw member is used in this example, for example, a pin without a screw or the like can be press-fitted as the reinforcing member.

Further, according to experience, many places where the plug is broken or broken due to collision of foreign matter are found in the head and the screw portion, but the stress concentration due to the notch effect occurs most in this portion. It is estimated that this is the case. Therefore,
For the purpose of reinforcement, it is considered that the metal screw member 16 may be screwed into at least the head and the screw portion inside the plug to reinforce the portion.

The first embodiment of the present invention is configured as described above, and its use example will be described below with reference to FIG. First, in a state in which the plastic plug 10 is not attached, the column 50 is filled with a filler such as gel, and the threaded portion 12 of the plug is screwed into the threaded portion 61 of the inlet / outlet member 60 of the column 51. Rotate.
Then, the plug 10 advances into the inlet / outlet member 60, and the taper portion 13 of the plug 10 gradually and tightly engages with the taper portion 62 for the column of the column having a slightly larger taper angle, and the taper of both of them is tapered. Finally, a complete seal portion is formed by the portion, so that the content inside the column 50, that is, the pipe 51 is prevented from being lost to the outside due to leakage.

When the column sealed with the plastic plug having the above structure is stored or transported for a certain period of time, even if the head 11 of the plug is impacted by a foreign substance,
Since the plug is reinforced by the metal screw member 16 which is a reinforcing member embedded in the plug to increase its strength, it is not damaged. Further, even if the impact is too great, the plug can be bent without separating the head part 11 and the screw part 12, and the plug can be easily taken out from the column by rotating the head part 11. There is no difficulty in removing the threaded portion remaining in the column due to breakage as in the conventional case.

<Second Embodiment> Next, a second embodiment of the present invention will be described with reference to FIG. In each part shown in FIG.
The same parts as those in FIG. 2 are designated by the same reference numerals.

In the embodiment shown in FIG. 3, the reinforcing member 20 has the same length as the metal screw member 16,
It is embedded and fixed in the plug by integral molding. The integral molding is preferably injection molding as in the above embodiment. Also,
The member 20 has a rod shape, and it is preferable that the outer periphery be provided with irregularities or the cross section should be a modified cross section such as a triangle in consideration of prevention of slippage between the member and the plastic part when the bent plug is rotated.

Since the plug of this embodiment has the same effect as that of the first embodiment and is integrally molded, a plastic member is once molded and a reinforcing screw is formed inside the plastic member as in the above embodiment. No complicated assembly process such as screwing members in is required.

In each of the above-mentioned embodiments, the plastic plug according to the present invention has been mainly described for a column of a liquid chromatograph, but the present invention is not necessarily limited to such an application, and the contents are accommodated and leakage thereof is caused. Needless to say, it can be applied to a container that requires a seal to prevent the above.

[0025]

As described above, since the plug of the present invention has the reinforcing member embedded therein, the strength thereof is improved, and the plug is hardly broken or damaged. Further, even if the head is bent, the head and the screw are not separated from each other. Therefore, by rotating the head in the direction opposite to the screwing direction, the plug can be easily removed from the screwed portion.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a plastic plug according to the present invention.

FIG. 2 is a diagram showing an example of use of the plastic plug of the above embodiment.

FIG. 3 is a view showing another embodiment of the plastic plug according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Plug 11 ... Head part 12 ... Screw part 13 ... Tapered part 14 ... Hollow part 16 ... Screw member 20 ... Reinforcing member 50 ... Column 51 ... Pipe 60 ... Entry / exit member 70 ... Fixing nut

Claims (2)

[Claims] 1. A plug made of a plastic consisting of a head portion, a screw portion and a taper portion, wherein a hollow portion is formed at least inside the head portion and the screw portion, and a reinforcing member is inserted and fixed in the hollow portion. A plastic plug that is characterized by being. 2. A plug comprising a head portion, a screw portion and a taper portion, wherein a reinforcing member is present at least inside the head portion and the screw portion, and is integrally formed of plastic. Plastic plug to be used.