JPS6330583A - Method of dropping and washing adhesive - Google Patents

Abstract

PURPOSE:To enable the dropping of an adhesive containing a curing agent through a nozzle onto an adherend and the washing of the adhesive adhering to the nozzle, etc., by dropping an adhesive containing a microencapsulated curing agent after crushing the capsules by means of a crushing member and, when the dropping is stopped, withdrawing the crushing member to drop the adhesive without crushing the capsules therein, thereby washing away e former adhesive, in which the capsules were crushed, adhering to the nozzle, etc. CONSTITUTION:An adhesive comprising a base material and a microencapsulated curing agent is fed from a tank 5 to a nozzle body 1 provided with a crushing member 8 constructed so as to be rotatable and movable upward and downward. The microcapsules in the adhesive are crushed between the crushing surface 9 of the rotating crushing member 8 and the crushing surface 4 on the nozzle side. This adhesive is dropped through a nozzle 2 onto an adherend 10. When the dropping is to be stopped, the crushing member 8 is moved upward to provide a space (h) between the crushing surfaces 9 and 4 to allow the adhesive to flow without crushing the microcapsules therein, thereby washing away the former adhesive, in which the microcapsules were crushed, adhering to the crushing surface 4, the nozzle 2, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an adhesive dropping/cleaning method, and more particularly to an adhesive that adheres to a nozzle and hardens without using a solvent after stopping the dropping. Regarding how to be able to wash away.

[Conventional technology]

As is well known, adhesives are used that consist of a base resin and microcapsules containing a curing agent suspended in the base resin.

When the adhesive is dripped onto the object to which it is applied, the microcapsules are crushed and the hardening agent inside is released, allowing the adhesive to be cured by the hardening agent. It should be used at least. For this reason, various techniques for crushing microcapsules while they are adhered have been proposed and widely put into practice.

One of these techniques is disclosed in Japanese Utility Model Publication No. 53-32154.

That is, in the process of supplying an adhesive consisting of a base agent and microcapsules containing a curing agent suspended in the base agent from a dropping device to an object to be adhered, at the nozzle that constitutes the above-mentioned dropping device. , the microcapsules are crushed by the cooperative crushing action of the nozzle and the crushing body, and the crushed microcapsules are supplied to the object to be adhered.

Then, when dropping is stopped, if you leave it as it is, the adhesive after microcapsule crushing will adhere to the nozzle, and the adhesive will stick to the nozzle due to the action of the sulfurizing agent that came out. Since the adhesive hardens, in this prior art, a solvent such as thinner is passed through a nozzle to wash away the previous adhesive.

[Problem that the invention seeks to solve]

According to the above-mentioned conventional technology, there are the following problems.

(2) Since solvents are generally flammable, they are dangerous and there are various restrictions on where this dripping device can be used.

■Solvents contain ingredients that are not good for the health of workers, so they pose health and hygiene problems for workers.

・■ A solvent tank, etc. must be installed separately, making the device complicated.

Therefore, the purpose of the present invention is to: 1. By simply using the adhesive itself to be supplied to the adherend without using any solvent, it is possible to completely eliminate the hardening of the adhesive on the nozzle when dropping is stopped. We are here to provide you with a method. Therefore, there is no need to worry about flammability, there is no danger to the health of workers, and there is no need to worry about dripping/
To provide a cleaning method.

[Means for solving problems]

In order to achieve the above object, the present invention has the following technical means. That is, using the symbols in the accompanying drawings that correspond to the embodiments,
To explain this, in the process of supplying an adhesive consisting of a base agent and microcapsules containing a curing agent suspended in the base agent from a dropping device to an object to be adhered, the above-mentioned dropping device At the nozzle constituting the adhesive, either the nozzle or the crushed body is brought close to the other, and between the two, the microcapsules are crushed, and then the microcapsules are supplied to the object to be adhered. In the agent dropping method: When stopping the dropping operation, either the crushing body or the nozzle, or both, are separated from each other to the extent that crushing action does not occur between them, and crushing is performed in this state. By flowing the adhesive consisting of the unprocessed microcapsules and the main agent through the passage opened by the above-mentioned separation, the adhesive containing the hardening agent after the microcapsules were crushed and adhered to the nozzle in the previous step was washed away. This is a characteristic adhesive dropping/cleaning method.

(Function) With the above configuration, when dropping is stopped, either the crushing body or the nozzle, or both, separate from each other. Therefore, even if the crushing body attempts to crush the microcapsules by rotation, etc., the microcapsules in the adhesive The capsules are not subject to effective crushing action between the two, and the adhesive containing them flows out from the nozzle without the microcapsules being crushed. The hardening agent and the main agent, which have caused the microcapsules to be crushed by the crushing action, adhere to the nozzle, and even though they are not hardened, they are washed away together. , the adhesive will not harden and stick.

〔Example〕

Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The figure shows a nozzle body with a nozzle 2 formed in the center of the lower part, and the nozzle inlet portion located on the inside 3 side of the nozzle body 1 is cut into a conical shape and is configured as a nozzle-side crushing surface 4. The interior 3 of the nozzle body 1 is configured to be supplied with an adhesive consisting of a base agent and microcapsules containing a curing agent suspended in the base agent by natural gravity or pump pressure. 5 is an adhesive tank, 6 is a supply pipe, and 7 is a valve.

Next, 8 indicates a crushing body having a conical crushing surface 9 formed at its tip corresponding to the shape of the conical nozzle-side crushing surface 4, and is configured to be rotatable and vertically movable according to commands of drive signals and control signals. has been done.

The crushing surface 9 is formed into a rough surface so as to easily crush the capsules in the adhesive.

The above merely shows an example of an apparatus for implementing the method of the present invention, and the example of the method of the present invention is implemented as follows.

That is, FIG. 1 shows the microcapsules contained in the adhesive being crushed while supplying the adhesive, and the microcapsules are crushed toward the adherend 10.
This shows a state in which adhesive mixed with a hardening agent is being dropped. More specifically, first, the crushing body 8 is positioned downward, and the microcapsules in the adhesive, which are supplied from the tank 5, passes through the wall surface of the interior 3, and reaches the nozzle side crushing surface 4, are removed from the nozzle side crushing surface 4. This figure shows the state in which the crushing body 8 is crushed by rotation between the crushing surface 9 of the crushing body 8. Then, from the nozzle 2, the adhesive, which is a mixture of the curing agent and the main agent released from the microcapsules when they are crushed, is dripped onto the adherend 10.

Next, when the dripping of the adhesive onto the adherend is stopped, if this continues, the adhesive after microcapsule crushing will adhere to the nozzle-side crushed surface 4, nozzle 2, etc.
However, in the present invention, the crushing body 8 is first moved upward based on a control signal as shown in FIG. 2.

That is, even when the crushing body 8 is rotated, a distance is maintained such that the capsules in the adhesive flowing between the crushing surface 9 and the nozzle-side crushing surface 4 are not crushed. Then, the microcapsules in the adhesive that flows into the interior 3 through the tank 5 and the supply pipe 6 and that come around the crushing surface 4 are not equally crushed, so the uncrushed adhesive causes the microcapsules to be crushed by the previous microcapsules. When the capsule is crushed, the hardening agent is released and the adhesive is flowed downward from the nozzle 2. In other words, the time required to wash away
This method flushes out the adhesive in the tank and flushes away the adhesive that is about to harden.

Although the adhesive in which the microcapsules have not been crushed remains in the nozzle 2, it does not harden to the same extent as the curing agent has not come out.

Therefore, there will be no hindrance to the adhesive dripping operation for the next adherend. The main body l may be moved to create an interval.

〔Effect of the invention〕

As detailed above, according to the present invention, 1) without using a solvent, simply using the adhesive itself to be supplied to the adherend, the adhesive after crushing the microcapsules that is intended to harden and adhere to the nozzle when dropping is stopped; It can be washed off. Also, since no solvent is used, there is no fear of flammability and there are no restrictions on where it can be used. Also, there is no risk of harming the health of workers.

(2) In particular, there is no need for a special solvent dripping means, and the process can be carried out with low equipment costs.

It offers various practical advantages.

[Brief explanation of drawings]

The attached drawings show embodiments of the present invention, and FIG. 1 is a cross-sectional view showing a normal process of dropping adhesive onto an adherend, and FIG. 2 is a cross-sectional view showing a state in which the adhesive is washed after microcapsules have been crushed after dropping has been stopped. In the figure, 2 is a nozzle, 4 is a crushed surface on the nozzle side, 8 is a crushed body, 9 is a crushed surface, 10 is an adherend, h
is the distance between the crushed body and the nozzle during cleaning after stopping the dripping operation. Figure 2

Claims (1)

[Scope of Claims] In the process of supplying an adhesive consisting of a base agent and microcapsules containing a curing agent suspended in the base agent from the dripping device to an object to be adhered, the above-mentioned dropping device is configured. An adhesive dropping method in which either the nozzle or the crushed body is brought close to the other at the nozzle, the microcapsules are crushed between the two, and the microcapsules are supplied to the object to be adhered. At the time of stopping the dripping operation, either the above-mentioned crushing body or the nozzle, or both, are separated from each other to the extent that no crushing action occurs between them, and in this state, no crushing occurs. By flowing the adhesive consisting of the microcapsules and the main agent through the passage opened by the separation, the adhesive containing the curing agent after the microcapsules are crushed and adhered to the nozzle in the previous step is washed away. Adhesive dripping/cleaning method.