JPS6270714A - Method for preparing air bubble tube of level - Google Patents

Abstract

PURPOSE:To prevent the generation of deformation by heating at the time of fusion, by rotating a cap mounted on the main body of an air bubble tube at a high speed and fusing the same by the friction heat of a pressure contact surface. CONSTITUTION:An oily liquid 10 having penetrativeness and volatility is injected into the main body 1 of an air bubble tube. Next, a cap 5 is mounted on said main body 1 and rotated at a high speed by a rotary friction transmitting tool 14. Simultaneously with this rotation, the cap 5 is slightly pressed to bring the contact surface of the upper end of the opening part peripheral wall 3 of the main body 1 and the bottom wall of the groove between the cock part 6 of the cap 5 and a ring shaped peripheral wall 7 to a molten mixed state within a short time and, therefore, at this point of time, the rotation of the tool 14 is stopped to complete a fusion. By this method,the adhesive for fixing the cap is made unnecessary and durability is made high and thermal deforma tion is eliminated and productivity is also enhanced.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a vial in a level.

[Conventional technology and its problems]

The vial of the level is made of synthetic resin, and consists of a vial main body with the other end closed, and a cap h7 that closes an opening at one end of the vial main body, and a cap that closes the opening of the main body. It consists of a plug part that fits inside the bubble tube body, and an annular peripheral wall that fits on the outside of the peripheral wall of the opening, and fills the inside of the bubble tube body with liquid, leaving a space for color formation on its upper surface, and then adheres the cap. A device in which it is attached and fixed via an agent is in practical use (Japanese Patent Publication No. 57-56006).

However, in the conventional vial, the vial body and the cap are fixed airtightly and liquid-tightly using an adhesive, which causes the following problems.

[11 If you apply adhesive to the groove between the plug part of the cap and the outer annular peripheral wall, the adhesive batt will be removed when the cap is attached.
1 may sag and air (Q) may flow into the liquid filled in the bubble tube body, so it is necessary to assemble the inner lid after injecting the liquid into the bubble tube body, which increases the number of parts accordingly.

(2) It takes time for the adhesive to harden, so the process is interrupted during that time.

(3) Adhesives may deteriorate due to repeated exposure to high and low temperatures.

[Object of the Invention] In order to solve the above-mentioned problems, the present invention provides a method for manufacturing a vial that uses a welding method instead of an adhesive and does not cause deformation due to heating during welding.

[Structure of the invention]

In order to achieve the above object, the present invention uses a vial body and a cap as molded products of thermoplastic synthetic resin, fills the body with liquid and attaches the cap, and then rotates the cap at high speed while rotating the vial body side. After applying pressure and melting the tip edge of the main body opening and the bottom wall of the groove where the frame of the cap and the annular peripheral wall fit together due to frictional heat caused by contact and sliding, the rotation of the cap is stopped and the contact and sliding portion is melted. This is a method for manufacturing a level vial characterized by integral welding.

[Function] By fixing the vial body into which the liquid has been injected, and rotating the cap attached to the body at high speed using a rotary friction transmission tool, and pressing the cap against the vial body, the pressure contact surface between the two is fixed. I'? Melt and mix at +6 heat and weld by stopping rotation of the cap.

〔Example〕

FIG. 1 shows a bubble tube body, and this bubble tube body 1 is made of acrylonitrile-butadiene-styrene copolymer resin (ABS).
It is a molded product made of impact-resistant transparent thermoplastic synthetic resin such as Inflate the center part in a large drum shape so that the air bubbles will be closer to the center when it is turned.

The peripheral wall 3 of the opening at one end of the vial body 1 is made smaller in thickness than the body wall. 4 is the stepped portion.

In FIG. 2, reference numeral 5 denotes a cap attached to the vial body 1, and this cap is also a molded product of thermoplastic synthetic resin. An annular peripheral wall 7 surrounding the opening peripheral wall 3 of the main body
The depth of the groove 8 between the frame portion 6 and the annular peripheral wall 7 into which the opening peripheral wall 3 of the main body fits is the depth of the groove 8 between the frame 6 and the annular peripheral wall 7.
The dimensions are slightly smaller than the height of the

A hole 9 is formed at the top of the cap 5 to fit into the frame 6.

Next, the process of manufacturing a vial will be described in order. First, as shown in FIG. 1, a permeable and volatile oily liquid 10 is injected into the bubble tube body 1 through a nozzle 11. The amount of injection is such that a space 12 for bubble formation is created with the cap tightly attached.

Note that the center of the liquid level of the injected liquid 10 is depressed due to surface tension, and the peripheral side rises along the peripheral wall, so if the injection is performed at a star level that does not reach the fitting part with the cap, the space 12 for bubble formation will become larger, so the cap A protrusion 13 is formed on the frame 6 to enter the space.

After the liquid 10 is injected into the vial body 1, the cap 5 is attached as shown in FIG. 3, and the cap is rotated at high speed by the rotary friction transmission tool 14.

Reference numeral 15 denotes a projection formed on the lower end surface of the tool, which fits into the hole S on the upper surface of the cap.

The rotation speed of the rotary friction transmission tool 14 is 200 to 500 rpm.
m, and at the same time press down the cap slightly (approximately 0.5 to 1 inch) to connect the upper end of the opening peripheral wall 3 of the vial body,
The contact surface between the frame portion 6 of the cap and the bottom wall of the groove 8 between the annular peripheral wall 7 reaches T! in about 1 to 2 seconds. Since the frictional heat brings the materials into a molten and mixed state, the welding is completed by stopping the rotation of the tool at this point. The above-mentioned operation of the tool as well as the raising of the tool after welding is completed are all performed under automatic control. In FIG. 3, 16 indicates a welded portion.

Moreover, FIG. 4 shows the obtained bubble tube, and 17 is a bubble.

Reference numeral 18 in the figure is a circumferential groove formed on the upper part of the outer circumferential surface of the camp frame 6, and this circumferential groove is used to prevent chips generated from the friction surface during the process of rotating the cap at high speed and generating frictional heat from the main body. This is a pocket that catches the liquid so that it does not get into the liquid inside.

〔effect〕

The method of manufacturing a vial according to the present invention provides the following effects.

fi+ The airtight and liquid-tight fixation of the cap attached to the vial body is done by welding instead of using adhesive, which eliminates the need for an inner lid when using the adhesive method, which reduces the number of parts and reduces the need for adhesive. There is no complicated kneading work or application, and the overall cost is low.

(2) It is more durable than fixing with adhesive.

(3) Since the cap is fixed by welding using the frictional heat generated by the high-speed rotation of the camp, there is no thermal deformation that is seen in welding where the joint is heated by a heat source.

(4) Productivity is improved by welding using the frictional heat of the high-speed rotation.

[Brief explanation of drawings]

The drawings show an embodiment of the method for manufacturing a level vial according to the present invention, in which Fig. 1 is a longitudinal cross-sectional view of only the vial main body, Fig. 2 is an exploded longitudinal cross-section including the cap, and Fig. 3 is a longitudinal cross-sectional view of only the vial body. is an explanatory diagram of the welding process same as above, and FIG. 4 is a longitudinal cross-sectional view of the completed vial. DESCRIPTION OF SYMBOLS 1...Bubble tube main body, 3...Opening peripheral wall, 5...Cap, 6...Frame, 7...
...Annular peripheral wall, 8...Groove, 9...
Hole, 10...Liquid, 12...Space for bubble formation, 14...Rotation 1? (Detection and communication tools, 15.
...Protrusion, 16...Welded part, 17...
...Bubbles.

Claims (1)

[Claims] It consists of a bubble tube main body with the other end closed, and a cap that closes an opening at one end of the main body, and the cap has a stopper that fits inside the main body opening, and an annular peripheral wall that fits on the outside of the peripheral wall of the opening. In the level vial, the vial body is filled with liquid leaving a space for bubble formation on the top surface, and the cap is attached and fixed in an airtight and liquid-tight manner.The vial body and the cap are molded of thermoplastic synthetic resin. After filling the vial body with liquid and attaching the cap, pressurize the vial body side while rotating the cap at high speed to fit the tip edge of the main body opening, the plug part of the cap, and the annular peripheral wall. A method for manufacturing a level vial, characterized in that after melting the bottom wall of the groove by frictional heat due to contact rubbing, the rotation of the cap is stopped and the contact rubbing portion is welded and integrated.